A complete mobile phone Structure Design Process

 

 

1. Determine the motherboard Solution

Mobile phone design companies are generally divided into the marketing department (MKT), The Shape Design Department (ID), and the Structure Design Department (MD ). A mobile phone project starts with a motherboard specified by the customer. The customer selects a suitable motherboard based on market requirements and obtains a 3D diagram of the motherboard from the solution company, look for a design company to design a certain style of shape and structure. Some customers directly find the design company's requirement to design a brand new design motherboard. This requires the mobile phone structure engineer to work with the solution company to stack the new motherboard according to the customer's requirements, and then perform subsequent work, I will not introduce it here. When the MKT of the design company signs an agreement with the customer and obtains the 3D diagram of the motherboard provided by the customer, the project is officially started and the MD work starts.

Ii. Production of Design Guidelines

After obtaining the 3D diagram of the motherboard, the ID cannot be called directly. md also converts the 3D diagram of the motherboard into six views and calculates the basic size of the entire machine.

Basic Skills: I took it as an interview question for the company. I knew whether I had taken an independent mobile phone test. If I did not answer the question, it would be useless even if my resume was more experienced, in fact, the answer is very simple. Take a mobile phone with a touch screen as an example. For example, the length of the motherboard is 99, and the length of the whole machine is 2.5 at each end of the motherboard, the length of the entire machine can be 99 + 2.5 + 2.5 = 104. For example, the width of the motherboard is 37.6, the machine width can be 37.6 + 2.5 + 2.5 = 42.6, for example, the motherboard thickness is 13.3, the thickness of the machine is 1.2 (including the upper shell thickness of 0.9 and the foam thickness of 0.3) on the motherboard ), add 1.1 (including 1.0 of the battery cover thickness and 0.1 of the battery assembly gap) under the motherboard, the thickness of the entire machine can be 13.3 + 1.2 + 1.1 = 15.6, the answer is not unique, you only need to describe the calculation method.

It is also important to note the issues that need to be paid attention to when designing the ID shape. This is a complete design guide.

3. determine the shape of the mobile phone

ID to get the design guide, first draw a sketch for conception, then focus on the Selection Scheme, determine the next two three sketch, both to meet the customer's requirements of creativity, the two three sketches have to be different in style, and then the machine is refined to draw a complete machine. During this period, the md should try its best to provide technical support for the ID, for example, whether the process can be implemented, whether the structure can be thinner, and the ID-completed machine can be adjusted and filtered by the customer, and the final solution can be transferred to the MD for structural modeling.

4. Structure Modeling

1. Data collection

The ID provides a wiremap for MD to start modeling. The wiremap ID is drawn based on the outline of the process chart, which can reflect the design intent of the ID more realistically. The output files can be in the DXF and IG formats, in the case of DXF format, MD needs to set the wireframes of different viewing angles in CAD in the orientation of the six views, so that it can be transferred to the PROE Line tracing (it is troublesome to rotate the line frames of different angles directly in proe ). there are also responsible IDs in the rhinoceros to help MD put the wireframes of different viewing angles in the Six-view orientation and save them into the IG format file. md only needs to draw lines in Roe. some people may ask, to put it all, Line tracing is required. Isn't it easier to use the wireframes provided by ID to draw a surface directly? No. The wireframes provided by ID are not parameterized and cannot be modified or edited, which limits subsequent structural adjustments. Therefore, it is not recommended that MD directly use the wireframes provided by ID. there are also IDs that do not describe the line directly to the jpg image, so that the MD can describe the line by itself, it is even more messy, the ratio of the length and width between the image scaling may change, the line drawn by the MD may differ greatly from the design intent of the ID. Therefore, it is not recommended that the Id be traced directly to the jpg image.

If an ID is used as a reference surface for a mobile phone, the ID can be modeled, and the freedom of the rhinoceros is higher than that of the PROE. Therefore, the ID modeling speed is faster than that of the MD, it's just that the ID does not have enough understanding of the drawing mode and disassembling, and the surface may be different from the actual one. It is not helpful for subsequent Structural Design and can only be used for reference.

In addition, if you have a reference prototype provided by the customer, or you can find a ready-made image on the Internet, this can facilitate MD modeling. the 3D version of the motherboard is originally available in MD and can be found and used directly. However, it is best to check it with the ID before using it to see if there is a mistake or if any version has not been updated, otherwise, it will be painful to find the board is wrong after the structure is completed.

2. Conceptual disassembling

Before using the MD, you must first think about how to split the mobile phone. An important idea for mobile phones is that there must be a subject in the mobile phone housing. The strength of the subject is the best, and the thickness is the thickest, the strength of the whole machine depends on him, and other parts are pasted on him. Such a mobile phone structure is strong, and the fixing of the Main Board is also dependent on the main body. If the Upper Shell is thick, it is suitable for the main body, the main board is usually mounted to the Upper Shell. If the lower shell is thicker than the upper shell, the main board is usually mounted to the lower shell,

The disassembling method is simple, and the strength of the mobile phone will be reduced if it is too old, and the Assembly difficulty will be increased. We need to discuss with our colleagues in the structure to find the best disassembling solution. after the disassembling scheme is set, we need to consider the PULL mode between the various shells. The upper and lower case should be more than 3 degrees, and the PULL mode around the hardware decoration piece should be more than 5 degrees.

3. Draw the appearance Surface

The appearance surface refers to the exterior surface of the mobile phone. A good curve shows a good surface, and the line drawing must be close to the ID box. The idea of respecting the ID is the basic cultivation of structural engineers. at the same time, the lines should be smooth as much as possible, and the curvature changes should be even as much as possible. If the PULL mode angle of the ID line is inconsistent with the structure requirement, you can negotiate with the ID, if there is little influence on the appearance, you can directly modify the draft angle of the contour line when the structure is traced. If the plastic shell retains the draft angle, the idea of ID is greatly damaged, consider using plastic molds for four-sided placement. After all, mobile phones are high-end consumer goods, which is worth the investment.

The shape of the mobile phone is symmetric. The exterior surface only needs to be half done, and the other half needs to be mirrored before the next part is split. After the exterior surface is finished, check the PULL mode and smooth state by yourself, then, create an assembly drawing, put the large area and the main board together, and check whether the basic size is sufficient. Finally, ask the ID to see if the operator does not meet the design requirements. After the ID is confirmed, You can unpack the package.

4. Initial disassembling

At this time, the disassembling is used to confirm the appearance and make the appearance of the Shouban for the customer, but the parts that can be seen in the appearance should be painted separately, convenient appearance hand board for different surface effects, the appearance of the surface has a rounded corner of the place to export the rounded corner, but this can not be omitted. the naming and distribution of parts in the assembly drawing are required. For example, keys are made for the key factory and can be concentrated in one component. The quotation and casting can be sent in one component form, very convenient.

5. Output of modeling data

After the MD modeling is complete, create the six views of the whole machine in the PROE engineering drawing, and feed back the DXF box file to the ID adjustment process annotation, the six-view wireframes of the created model may be modified with the wireframes provided to MD by the original ID. The ID needs to be updated appropriately and the process diagram is further completed, mark the material and surface technology of each visual component, and provide the materials for silk screen printing or laser engraving,

The updated process diagram, with the help of the MD modeling 3D diagram, can be used as the exterior Shouban.

5. Make and adjust the appearance of the hand panel

The appearance of the Shouban has a special Shouban factory, making a straight phone needs 3 ~ 4 days, the appearance board is solid. not detachable, mainly used to confirm the appearance of the customer, now the appearance of the Shouban button can pad the litter at the bottom, with a sense of shot, just like the real machine. after receiving the report, the customer evaluates and provides the modification suggestions. After the MD is responsible for improvement, the customer can start to build an internal structure.

Vi. Structure Design

To refine the structure, we should first start with the overall layout. I advocate that the overall structure should be well planned, that is, the upper and lower shell stop lines, the screw column and the main buckle structure should be well done to complete these three steps, the mobile phone framework is built. then follow the order from top to bottom, from top to ground to complete the detailed structure. From top to bottom means that the Upper Shell component is finished first and then the lower shell component is made, the order in the top and ground refers to the order in the Upper Shell component and the mic at the bottom of the top receiver. This is the overall idea. You can also adjust the order in the specific part, for example, if the screen occupies a relatively large position, I can do the screen first and do the rest in order. please note that the structure of each detail should be as complete as possible and the next detail should not be added to the subsequent inspection and optimization.

1. Preparation of the stop line

Starting from the internal structure, the upper and lower shells are extracted, and the basic wall thickness is usually 1.5 ~ 1.8mm. the gap between the upper and lower shells is zero. As mentioned earlier, how to determine the main body is suitable for the parent Stop port. The other part is used for the public Stop port. The Stop port should not be too deep. Generally, 6mm is enough, in order to facilitate assembly, the public Stop port can be properly used as the draft angle or guide the C angle.

2. Screw Column Structure

The screw column is the key to determining the strength of the machine. Generally, the main board will reserve six holes for the screw column. Do not waste it and use it as much as possible. another important role of the screw column is to fix the motherboard, Which shell is installed on the motherboard, and the screw column's practice also changes accordingly. The screw column should not only be connected to the hole phase on the motherboard, the side of the screw column also needs to be reinforced to clamp the motherboard, so that the structure is reliable.

3. layout of the master button

4. fixed structure of five gold slices decorated with Upper Shell

The upper shell decoration five gold pieces are generally made of stainless steel or aluminum, thickness 4mm or 0.5mm, with thermal adhesive, double sided tape or buckle position fixed, the surface can be brushed, electroplating and laser engraving. the aluminum can be oxidized to different colors on the surface, and bright edges can be cut out at the edge.

5. Fixed Screen Structure

The screen is like the face of a mobile phone. Do you have to protect it and build a wall? By the way, it is necessary to use the Upper Shell to grow a circle around the bone and keep it on the motherboard (1mm gap) to close the LCD, even if it is affected by external force, it is also pressed on the surrounding bone of the Upper Shell, because the surrounding bone is higher than the screen. the front of the screen cannot be in direct contact with the upper shell. If it is hard to hit the screen, the screen will be broken. The front of the screen must be pasted with a circle of 5mm thick foam, and the thickness of the foam after being compressed is 0.3mm, therefore, the gap between the front and the upper case of the screen is 0.3mm. we have mentioned the method for calculating the thickness of the whole machine. Please pay attention to how the thickness of the front part of the screen is calculated. See the figure below.

In order to facilitate the loading of the screen, we will add a guide angle on the top of the surrounding bone. Of course, if there are components around the screen, we still need to reduce the glue to avoid it. The gap should be at least 0.2mm, if you want to avoid connecting the screen to the motherboard FPC, the gap between the circumference and FPC should be more than 1.0.

6. fixed structure of the receiver

The handset is the phonograph device of the mobile phone, generally on the top of the screen, in addition to positioning, but also need to have a good sealing sound cavity, the structure of the Upper Shell from a circle surrounded by bone outside the receiver, similar to the wall bone of the screen, but the wall bone does not have to be supported to the motherboard. It is enough to wrap the wall thickness of 2/3. then, the Upper Shell starts a circle of surrounding bone to enclose the audio hole of the receiver, compress the bubble cotton on the front of the receiver to form a relatively closed Sound cavity, and finally open a sound hole on the Upper Shell, the range of the Upper Shell sound hole should be within the range of the sound hole of the receiver.

In terms of appearance, some simple decorations will be made on the audio Hole Location of the receiver, such as a net-shaped nickel slice (see the figure below ). you can also make an electroplating plastic decoration with the dust mesh, pay attention to the plastic decoration is usually fixed using the hot rubber column, dust mesh is attached to the inside of the audio cavity of the receiver,

7. Fixed front camera Structure

The front camera is located on the front of the motherboard and uses PFC. The connector is connected to the motherboard. the camera positioning is also carried around the camera from the Upper Shell. the camera is like the eyes of a mobile phone. In order to ensure a good shooting effect, the camera's front lens must be well sealed to prevent dust or foreign body from entering the line of sight, we use foam to separate the lens from the inside of the chassis, while the outside is stamped with a transparent lens. To ensure good light transmission and wear resistance, the camera lens is made of glass and silk screen at the bottom, the purpose of screen printing is to cover the dual-sided adhesive paper between the lens and the housing,

It is worth mentioning that the camera lens assembly is done at the final stage of the whole machine assembly. After the whole machine is locked with a shell, it should be blown carefully with an air gun, the lens is attached to the shell through the double-sided adhesive tape to cover the lens.

8. fixed structure of power-saving lenses

Power-saving lenses are rarely used. Some mobile phones have power-saving settings. You need to open a skylight on the mobile phone case to enable the photosensitive ID inside to sense the brightness of the outside world, this requires opening a hole in the casing and adding a lens. The lens can be cut and attached directly to the outside of the casing with a PC sheet. It can also be made into an injection-molded light guide column and fixed by hot stamping on the inside of the casing.

9. Fixed mic Structure

Mic is located at the bottom of the mobile phone, just like the ears of the mobile phone. It is a component that converts the external sound into an electrical signal. Therefore, it is necessary to transmit the external sound to the mic without hindrance, at the same time, it is necessary to prevent the sound of the internal cavity of the shell from affecting the mic. At the same time, the MIC itself will be wrapped in a rubber cover, and only a small hole will be exposed in front of it to sense the sound, the front must also be well attached to the shell. The sound guide hole on the shell generally opens a circular hole of 0mm.

MIC can be connected to the motherboard by means of welding wire, FPC welding, or welding on the motherboard.

10. Structure Design of the master button

The main buttons of the mobile phone can be divided into ultra-thin buttons and regular buttons by thickness. In the past, the phone was used as a flip host. During the slide host, the thickness of the buttons was less than 2mm, directly Using the sheet with silica gel structure, sheet can be thin steel sheet or PC piece, in order to ensure that the buttons do not move, different function keys on the sheet will be separated by via holes (for example, the V3 mobile phone's primary keys do this). The silica gel is used to get a good button feel.

Currently, many direct machines are on the market. I will take P + R as an example to describe the structure design of the main buttons, and divide the structural design workload of the direct machine into 100 parts, I think the structural design of the key components accounts for 30%, the Upper Shell components account for 30%, and the lower shell components account for 40%. This shows the importance of the buttons. the P + R button consists of three parts: the keycap component, the bracket and the silica gel. Some buttons also add a shadow paper between the keycap component and the bracket to prevent transmission between the buttons.

The bracket material is determined based on the button thickness. It can be injection molded with PC or ABS, with a thickness ranging from 0.8 to 2.0mm. Alternatively, it can be directly punched out with PC sheet with a thickness of 0.5, 0.6 or 0.7mm; when the button thickness is not enough, the bracket material is made of 15mm mm thick stainless steel, but considering the effect of the steel sheet on the motherboard during ESD (electrostatic test, we need to bend a cantilever on both sides of the steel sheet, connect to the grounding net on the domeon, or turn on the grounding copper foil on the PCB with buttons. The thickness of the silicon film is 0.3mm, combination of front-end and key-cap glue. the dome column on the back is used with the WAIPA.

11. structure design of side buttons

The side buttons are on the left and right sides or the top side of the mobile phone. They are usually used as the volume key, shooting key, activation key, or locking key. The structure is simpler than that of the main button, the position of the side buttons on the motherboard usually uses the welding method to fix several mechanical buttons with lateral pressure. A mechanical button corresponds to a function. mechanical Side buttons have the advantages of simple structure and good feel. there are also FPC buttons, and the pad position is reserved on the motherboard. a fpc button is fixed by surface welding. the FPC button is bent and bent toward the side. The WAIPA on the keyboard can sense the touch pressure. the advantage of the FPC side buttons is that the center position of the side buttons can be slightly adjusted as needed when the motherboard remains unchanged.

The Structure Design of the side buttons is usually in the p + R format. Compared with the main buttons, the side buttons do not need to be used as the button holder. The silicone part should not be hard to help improve the feel, the keycaps have a skirt to prevent leakage. The surface treatment of the keycaps can be primary colors, fuel injection, or electroplating. Because there are no LED lights, the side buttons do not require light transmission, and crystal keycaps are rarely used, feature characters are generally made on the keycaps in a concave manner.

The side button is fixed by stretching out an ear on the side of the side button, and then holding the bone with the shell, this is mainly to prevent the keys from loose during the assembly process of the whole machine, once the shell is closed, the clamping part of the side button is basically useless, and the matching gap of the clamping part is zero.

12. Structure Design of USB Plug

USB Plug-in is used to protect the lid of the USB connector. For convenient opening and closing, it usually uses soft TPE or TPU material. The structure of USB Plug-in is divided into four parts: body, hand position, tongue, and positioning column, the color is black or the color is similar to that of the housing. The function character of USB is engraved on the body, and the hand position can be expanded or dug into an inner concave shape. the part of the tongue is USB plug into the USB connector to prevent loose rubber bones. The positioning column is the reverse buckle of the USB Plug fixed on the housing, which can be made into an external plug or direct pressure (directly stuck between the housing ).

Cell phone similar to the structure of the T-FLASH card or SD card plug, a little longer plug can also be made into P + R structure, that is, the body, Hand parts with hard glue material, and the plug-in inside, the fixed part is made of soft glue, hard glue material and soft glue material are bonded together with glue.

13. Structure Design of screw hole plug

The screw caps exposed on the mobile phone surface will affect the appearance and must be covered with screw holes and rubber plugs. the screws in the battery cap can be masked. the structure of the screw-hole rubber plug is relatively simple. The mold can be placed in the same mold as the USB rubber plug, which is made by the mold factory. the screw-hole rubber plug is similar to a cylindrical shape and can be hollowed out inside for convenience and convenience, the external surface of the screw hole rubber plug must be consistent with the contour surface of the shell, and the diameter should be as small as possible (0mm larger than the diameter of the screw cap). If the external surface of the two screw holes is different, if it cannot be exchanged, it is necessary to differentiate it on the cylindrical surface of the screw hole rubber plug.

The screw hole rubber plug can be made eccentric with different axes of the screw according to the needs of the structure, as long as it can cover the screw cap on the line.

Because screws must be used to disassemble the whole machine, in order to verify that the mobile phone has not been opened without permission, some manufacturers will dig a platform on the top of the screw hole in the battery cover to add a piece of fragile paper, if you want to loosen the screw in the screw hole, you must destroy the fragile paper. the platform of the fragile paper must be designed based on the size of the fragile paper. The shape of the platform is slightly larger than that of the fragile paper, and the position is lower than that of the shell to prevent the fingers from accidentally touching the fragile paper.

14. Fixed speaker Structure

The volume of a mobile phone is a strong selling point, which puts forward higher requirements for the speaker. in addition to requiring the solution company to tone the speaker itself to the best state, the speaker's sound cavity structure should also pay attention to the following points:

A. the front sound of the speaker must be closed. if the horn works directly with the shell, the ring foam must be closed between the horn and the shell, and the side of the horn must be surrounded by a long ring surround bone, if there is an antenna bracket between the horn and the housing, then the ring foam must be attached between the horn and the antenna bracket, and the ring foam should be closed between the antenna bracket and the housing, in short, let the sound of the horn pass out through the sound hole on the shell.

B. the height of the front sound cavity of the speaker must be greater than 1.5mm. the height of the sound cavity refers to the vertical distance from the front of the speaker to the wall of the shell. To ensure the height of the sound cavity, you can even thin the inside of the sound cavity of the shell to 0.6mm.

C. the area of the exit hole must reach 15% of the exit area of the speaker. The exit hole area is the sum of the total area of the exit hole. the out-of-speaker area is the area of the middle part after the front of the horn is removed from the foam. The higher the sound chamber height of the horn, the larger the out-of-speaker area is required, when the height of the speaker's audio cavity is more than 20, the output audio hole area can be larger than the speaker's audio area, that is, 100%. for most mobile phones, the speaker sound is in the 1.5 ~ 4mm. The exit hole area accounts for 15% of the speaker's exit area ~ 20%, sound effect is better.

D. the most concise method of the output sound hole structure is to open a hole directly on the shell. It can be a circular hole array or a long bar hole. to prevent dust and foreign body from entering the sound cavity, add a dust-proof net to the inside of the shell. For the sake of appearance, add a nickel, PC, and other decorative parts to the outside of the sound hole, the diameter of the net hole of the nickel can be as small as 0.3mm. When the nickel is used, there is no need to add dust mesh on the inside of the shell.

E. The rear acoustic cavity of the horn mainly affects the low-frequency part of the ringtone, but has little impact on the high-frequency part. In order to achieve a good bass effect, the antenna bracket can be used in combination with the motherboard without interference from components, and the rear sound cavity of the horn can be closed by adding foam to form a rear sound cavity. now, in order to achieve a more shocking bass effect, the speaker family already has a vibrating horn, which can produce different strong and weak vibrations based on the sound size, the vibration is directly transmitted to the user's hand through the shell.

15. Fixed structure of the undershell camera

The fixing structure of the lower-shell camera is similar to that of the Upper-shell camera. The PFC or connector is used to connect to the motherboard. The positioning requires the surrounding bone, and the sealing requires foam and lenses, however, the difference is that the positioning of the camera in the lower shell uses the antenna bracket to enclose the camera around and at the bottom of the lower shell with a fixed camera. in order to ensure that the center of the camera and the center of the shooting hole in the lower shell do not have an offset,

The lower shell positioning of the surrounding bone is still necessary. The lower shell camera lens is also installed after the whole machine blowing clean mirror dust, and finally installed.

16. Structure Design of lower shell decoration parts

The lower shell decoration can be plastic, IML, and gold.

The surface of plastic decorative parts can be used for electroforming. The advantages are strong metallic sense, high grade, good wear resistance, and plastic decorative parts can be directly burned or buckled on the shell, with a thickness of 0.9 ~ 1.0, IML is to put a film with a silk screen pattern in a plastic mold for injection. This film can be divided into three layers: substrate (usually PET), ink (ink) wear-resistant materials,

After the injection is completed, film and plastic are integrated, and the wear-resistant materials are in the outermost layer. Most of the injection materials are PC and PMMA, which has the effect of abrasion resistance and scratch resistance. The surface hardness can reach 3 h. IML parts are directly burned or buckled on the shell, with a thickness of at least 1.2mm.

Nickel is the most commonly used hardware decoration, with a beautiful appearance. The thickness of the ultra-thin tweezers is 0.1 ~ 0.15mm, no need to open the mold can be done, the diameter of the mesh hole can be smaller than 0.3mm. if there is a step bending, it is necessary to open the mold to make, the overall thickness cannot exceed 3mm, the side of the step to pull the mold more than 10 degrees.

Thickness of Aluminum decorative parts: 0.4 ~ 0.5mm, because of its soft quality, the surface is brushed into straight lines, garbled lines, ripple and Spiral Lines. Anode processing is also called corrosion processing. It is an oxide film formed by current on the metal surface. It has rich colors, beautiful colors, good electrical insulation, hard wear resistance, and high corrosion resistance. Sand blasting is used to obtain the surface of the film Light decoration or microreflective surface, in order to meet the special design requirements such as glossy and soft. High-gloss processing is post-processing. A oblique bright side is milled on the aluminum edge, and the shape is like a C-angle guide.

The thickness of the stainless steel ornament is 0.2 ~ 0.3mm, the hardness is higher than the aluminum decorative parts, the previous color is single, but with the development of technology, the color has gradually enriched. Other Surface Treatment Effects of Stainless Steel Decorative parts include drawing, high-gloss (mechanical polishing), pitting (sandblasting), Matt.

17. Structure Design of the battery box

The battery is the place where the cell phone stores energy. It requires the battery to be easily loaded, the contact is good, and it cannot be flipped out or fetched. The structure of the battery box must meet these requirements,

A. The basic material thickness of the battery case is 1.0mm. The bottom of the battery case should be closed as much as possible, and components should be avoided. No components should be covered with plastic shells to avoid exposure of large PCB.

B. gap. The single side gap in the push direction is 0.2mm, and the PULL mode is 3 ~ 5 degrees. The single side gap in the non-withdrawal direction is 0.1mm, and the PULL mode is 1 ~ 2 degrees. The gap between the bottom and the battery of the battery case is 0.1mm. The gap between the rubber shell and the SMD element is 0.2mm. The gap between the rubber shell and SIM card connector at the bottom of the battery case is 0.5mm.

C. the two ends of the battery direction need to be fastened with the battery to prevent loose. The amount of charge can be evaluated based on the rotation of the simulated battery. the Picker's hand must leave pits a little wider than the nail to help your fingers snap out the battery.

D. the battery cabinet should protect the battery connector, that is, after the battery is put into the battery box, it can only access the shrapnel of the battery connector, rather than the body of the battery connector, avoid damage caused by impact to the battery connector during the drop test.

18. Structure Design of Motor

A motor is an electronic component that produces a weak mechanical vibration on a mobile phone. When the user sets a mute, the vibration of the motor can enable the user to sense the electric power. The shape of the motor is divided into a column and a flat shape, the connection methods mainly include wire, shrapnel, SMT and plug-in.

Wire-welded, shrapnel-and plug-in columnar Motors usually have a rubber sleeve on the outside of the body. We only need to wrap the bone around the rubber sleeve on the shell, the gap between the surround bone and the rubber sleeve is zero, and the reserved guide angle on the top of the surround bone facilitates motor loading. be sure to reserve enough rotation space for the eccentric wheel. The rotation range of the shell should be at least 0.5mm.

Flat motor without rubber sleeves, one side of the pressure on the board, the other side directly with double-sided adhesive on the shell, around the 2/3 circle of surrounding bone can be, you may ask, why is there a 1/3 gap in the surrounding bone? The original structure design should not only consider the reliability of assembly, but also consider the ease of disassembly. with a gap of 1/3, we can use tweezers to crack the motor When disassembling it. here we can say that we need to leave a gap of 1/3 for the positioning of the induction magnet on the mobile phone, the same principle is true. the flat motor can also be fixed on the antenna bracket. One side is attached to the antenna bracket with double-sided adhesive, and the circumference around the antenna bracket is 2/3 rings. The other side is pressed by the shell with long rubber bone, note that the motor cannot be hard pressed by the rubber bone,
The gap between the rubber bone and the motor is 0.3 blank, and a layer of foam is attached for buffering to protect the motor.

19. Structural Design of the pen

The pen is only used on a mobile phone with a touch screen. It is usually fixed on the lower shell and pulled out during use. The pen can be divided into a pen cap, pen tube, and pen tip. The pen can be mounted on the pen cap, pen hanging with a hand dial, easy to draw out, pen tube for hollow stainless steel tube or copper tube, can be made with according to the need for a paragraph or multi-segment lengthen. tip with a groove, positioned by the groove after inserting the lower shell,

20. Structure Design of the battery cover

Battery, SIM card and T-FLASH card to be designed to replace, hide them in the lower shell of the battery box, and then design a can easily open and close the battery cover to protect them, the material of the battery cover can be plastic parts, and decorative parts such as lenses or gold parts can be attached to the surface. The stainless steel sheet can also be used for bending and forming. The structure of the battery cover includes the hand position, buckle, and side buckle, dial point. The snap position is the place where the power is applied when the battery cap is taken. The snap position and side buckle are the block structure when the battery cover is inserted into the lower shell, the dial point is the lock structure to prevent exit after the battery cover is inserted into the lower shell.

20. Structure Design of threading Holes

The rope-piercing hole is the structure used to fix the hanging rope on the mobile phone. A lightweight mobile phone can be mounted on the chest with a hanging rope. However, as the number of metal ornaments on the mobile phone surface increases, the increase in battery volume caused by ultra-long standby means that the weight of the mobile phone itself is gradually increased, and some customers no longer require rope-mounting holes. I do not recommend that you stick your cell phone to your chest. Apart from the fact that the security environment on this side is not allowed, the unsecure cell phone battery is gradually worrying about more and more people!

The structure of the rope-piercing hole is generally made in the lower shell. The blank position of the antenna bracket is used to see the plug-in, and the row position is indispensable. It is also necessary to ensure that the bone position of the hanging rope has sufficient strength.

VII. Sort quotation chart information

Here, the structure design of the mobile phone has come to an end for the time being. First, let's make an important thing-provide the plastic mold quotation map for the customer. It takes about 18 days to make the plastic mold, this is the top priority of the entire mobile phone project. Before that, it may take a few days for the customer to select a model factory. The customer first handed over the preliminary structure diagram to the customer to contact the supplier, which can shorten the time for the entire project process, we can optimize, review, and modify the product within a few days of customer contact with the supplier. Our structure design is also completed when the customer selects the supplier, it is in the mold review phase with the mold supplier.

It should be noted that the plastic mold quotation diagram includes the 3D diagram of the plastic parts, BOM and ID process annotation. for the sake of data security, none of the plastic parts that do not need to be quoted can be provided, and only a small number of plastic parts need to be quoted, and it is best to convert them into STP format, which facilitates the quotation and is not convenient for other purposes. the BOM table is only for plastic parts to avoid error prices. the above materials are only sent to the customer, and the customer will contact the supplier. Generally, the design company does not intervene in the customer's business.

8. Structure Design Optimization

Now, we can calm down and optimize our own structural design. The design scheme will become a product. There are many problems that need our consideration and prevention, such as whether the surface hardware needs to be grounded; how to cooperate between the motherboard and the housing; how to increase the strength of the housing; how to improve the convenience of mold making and so on.

9. structure review

The design made by each structural engineer always involves issues that cannot be found by the engineer. Other engineers are required to check whether they are in different positions and observe different angles. The judgment may also be different, if you have any questions, you can discuss the problem and make the drawing level higher. during the review, another Structural Design Engineer will first review the drawings. The preliminary review takes about half a day, and the drawings should be reviewed from appearance, scheme evaluation, Upper Shell components, lower shell components, and surface technology, the feasibility of the mold should be checked one by one in the order of production and assembly, and the problem points should be recorded. then we enter the second stage-collective review. The collective review is a meeting attended by all the members of the structure department and related ID designers. We will list the preliminary review questions and give comments to everyone to unify their understanding, it not only ensures that the issued drawings can represent the highest standards of the company, but also provides an opportunity for structural design engineers to learn and improve. in Shenzhen, the larger the design company, the more important it is to the role of collective review.

10. Verification of structural Shouban

The above structure is good, but it is just a discussion on paper. The structure design needs to be verified by means of physical objects, and the structure Shouban plays a role in verifying the structure. The materials for the structure Shouban include ID Technology labeling, BOM and 3D image files (of course still need to be converted into STP format). It takes about four days to make the structure Shouban, And the appearance and size must be consistent with those of the drawing. This is close to the final prototype, I got the structure hand board with the motherboard and battery. This is a real mobile phone. Don't be so happy. Check the Part Size carefully to see if there is no problem with the assembly of the whole machine, there is no improvement to make the production more convenient and fast. Now we can make the mold more convenient.

11. Mold Review

Does it take four days for the structure Shouban to be made? during this time, we can send the ID process annotation, BOM and 3D drawing materials to the customer, the solution company and the selected Mould Factory for review, this review usually takes one to two days. If the customer has his own technical strength, he can check the review. The solution company can evaluate the problems that may occur when receiving the antenna signal, the mould factory will put forward some improvement suggestions on the problems that may occur during mold manufacturing, and feedback the improvement suggestions to the design company. if necessary, the customer will hold a meeting with the design company and the mould factory to discuss the improvement suggestions of the Mould Factory. problems that need to be paid attention to during mold opening can be raised, the customer makes the final decision on the controversial issues between the design company and the model factory. The discussion results are delivered to the customer in triplicate, and the design company and the model factory are kept at the bottom,
The design company updates the Drawing Based on the discussion results, and issues a formal opening drawing. The opening drawing includes the final ID process label, BOM and 3D drawing.

12. project follow-up during Model Casting

It may take about 18 days for the plastic parts to be opened. Is there no time to do this? Of course not. In addition to plastic parts, mobile phone suppliers also include buttons, hardware, lenses, nickel, battery, pen, accessories, etc. As long as this phone is used, the same cannot be less. because the development cycle of these parts is shorter than that of the plastic parts, we can use the plastic parts to open the mold during this period of time for quotation, proofing and opening the mold. thanks to the buttons, it may take about 14 days for the Hardware Mold. Some companies have also synchronized the progress of plastic parts, buttons, and hardware projects. auxiliary materials are relatively cheap. You can send packages to the molding factory for procurement. Before the molding factory ships the auxiliary materials (such as foam and dual-sided adhesive paper) to the designated position on the housing, this greatly simplifies the assembly process for the entire machine.

13. Test Mode and modify Mode

The following uses plastic parts as an example to describe how to test and modify the mold. The suppliers try and finish the plastic parts after making the mold to meet the design requirements. the customer will catch up with samples of other accessories before the test. During the test, the customer will go to the mold factory together with the structure design engineer, and the Structure Design Engineer will inspect all the accessories for single items and actual installation, the inspection of a single item includes the inspection of appearance defects and dimensions. The inspection is to install all the accessories according to the actual assembly sequence of production to find out the problem. all problems are listed in sequence, and they are coordinated with the Mould Factory to determine the improvement plan, the improvement time and the responsible person for the improvement. The design company and the mould factory are subject to disputes and the customer makes the final decision, the discussion results are signed and copied in triplicate to the customer, and the design company and the model factory are kept at the bottom,
Based on the discussion results, the design company updated the die-changing drawings and issued a formal die-changing diagram. The die-changing diagram includes the detailed text description of the die-changing part, and the 3D drawings of the die-changing parts are required. the part of the 3D drawing that needs to be modified must be marked in red. there is no detail in the problem of model change.

14th, trial production

After the improved sample, we need to repeat the test procedure for testing. However, on the test model, the lower shell and other exterior accessories can be processed on the surface (for example, the ID process diagram indicates that the surface injection, over UV, oxidation, wire drawing, silk screen printing, electroplating, laser engraving) and then carry out the actual installation. If the actual installation is confirmed correct, you can schedule the trial production. problems that cannot be found in a small number of installations during trial production are generally 50 ~ 100 machines are assembled according to the actual production layout of the production line. During the trial production, the customer will go to the assembly factory together with the structure design engineer to explain the assembly sequence and precautions by the structure design engineer, the PE engineers in the assembly plant arrange the production lines one by one to guide the operator on the correct operation methods and judgment standards. The PE engineers must complete the work instruction for each Assembly position before production.
The Assembly in the assembly plant strives to be concise. The auxiliary materials have been attached to the shell by the Mould Factory, and the five gold pieces have been heated to the shell by the Mould Factory. As long as the assembly plant installs buttons on the shell, motherboard, Shell, lock screw, install lenses, and finally test, the packaging is OK.

Problems found during the trial production are recorded by the structural design engineer. If the model needs to be changed, the structural design engineer will generate the mode change diagram. The mode change diagram includes a detailed description of the mode change part, 3D drawings of parts to be modified. the part of the 3D drawing that needs to be modified must be marked in red. notify relevant suppliers to improve the model and follow up the progress and results of the mold change. After the mold change is completed, the product will enter the production stage.

15th, Mass Production

After many arguments, modifications, tests, modifications, and structural design engineers, the results of hard work are coming soon. All problems have been solved before mass production. If there are no problems, the mass production process does not require the participation of structural design engineers. According to the current market conditions, the customer can recover the cost if the sales volume of mobile phones sold at the left of 800 RMB exceeds 5 K, if there are more orders, the customer will make a profit. after the product is listed, the customer may make some changes according to the market feedback. Then, the structure design engineer can respond accordingly. the feeling of buying a mobile phone on the market is as comfortable as your child is being praised by others.

 

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