The journey of a bolt

This paper, with the example of bolt distribution and assembly, illustrates the application and principle of MES in advanced manufacturing of WMS and manufacturing Execution System of logistics management system.

We know that bolts are a key part of the engine and that the manufacturing and assembly processes have a great impact on the overall quality of the engine.

The following table lists the key process control points for this bolt:

Regional	Station or Location	Job Content	System
Warehouse	WM100	Storage of whole-box parts	Wms
Batching Zone	WM200	Package bolts and springs, gaskets	Wms
Assembly Area	OP10	Automatic material pull triggered after engine stops	Mesàwms
	OP20	Assembling bolts, manually pulling the material	Mesàwms
	OP30	Manual pre-tightening of bolts	Mes
	OP40	Automatic end tightening of bolts	Mes

is the process:

Below we analyze from 3 levels of material distribution, assembly, material pull.

1. Material distribution

The distribution of bolts consists of 3 large steps:

1) The bolt is received from the supplier's lorry, and after unpacking inspection, the forklift is sent to the designated storage area of the warehouse, and the location is WM100.

2) Use the forklift to send the bolts from the warehouse to the distribution station WM200, the workers in this position to bolt and supporting the spring, gaskets together, put into the turnover pallet box.

3) Use the automatic tractor AGV to send the supporting bolt assembly to the assembler bit OP20.

For this purpose of distribution, we need to define the following BOM for this Bolt in the WMS:

< p> number	description	library	address
BT0010	Bolt xxxx		WM100
BT0010	Bolt xxxx		WM200
BT0010	Bolt xxxx	"	OP20

2. Assembly

The bolt assembly process consists of 3 stations:

1) in OP20, the worker puts the bolts in the corresponding position. Assuming there are 4 sets of identical bolts, the number of uses is 4.

2) in OP30, the worker uses a tightening gun to pre-tighten the bolts. Assume that each station has a default configuration of 8 guns in the MES system, and this operation should use the No. 1-4 gun, which is calibrated in advance for each gun's torque range.

3) in the OP40, the robot automatically uses the tightening gun for the final tightening operation, the tightening sequence is 1-4-3-2.

Then the complete material configuration information in Mes is:

Station	Item number	Number
OP20	BT0010	4
OP30	BT0010	0
OP40	BT0010	0

When the engine came to the OP20, the bolt corresponding to the rack light is often bright, until the workers took 4 times, after the completion of the error is extinguished.

The complete fastening error-proof configuration information in Mes is:

# gun Count	" gun Count	gun count	tightening order
OP30	1	1	1	1	0	0	0	0
OP40	1	1	1	1	0	0	0	0	1432XXXX

In the OP30 station, when the 1-4 number of guns effective tightening, the corresponding gun to prevent the wrong completion, when the 4 guns are complete anti-error, then the position of the tightening of the error is completed, the release light is often bright.

In the OP40 station, the robot according to the configuration information, according to the order of the 1-4-3-2 first tightening with a smaller torque, and then with a larger torque of 4 to tighten the gun together.

3. Material Pull

This includes the two-level material pulling method: 1) The assembly area pulls the batching area, 2) The batching area pulls the storehouse.

Among them, the pull of the assembly area is divided into two kinds: 1) automatic pulling of OP10 station, 2) manual pulling of OP20 station.

When the engine completes the assembly work of the OP10 station, MES generates the station record, then synchronizes the wms,wms with Kanban or electronic kanban to remind the workers of WM200 station to carry out the batching work.

When the engine completes the assembly work of the OP20 station, if the worker finds that the material is not enough, it can be pulled by manual call, and the call information is sent to the batching area via WMS.

The logic of pull in the batching zone is this: every time when the AGV trolley is feeding to the assembly area, the WMS automatically deducts the WM200 material quantity, when the quantity is less than the safe stock, it sends the pull information to the warehouse distribution personnel's vehicle terminal automatically, thus completes the material pull the notice.

The journey of a bolt