The function of MES system software in auto parts manufacturing quality control

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This paper briefly describes the application of MES system software in quality control of automobile and auto parts production line. The purpose of application is to improve the quality of production and assembly, control the occurrence of defective products, improve the qualified rate of finished products, and provide traceability function of production information.

Auto parts MES system software

I: MES system software application background

Whether it is for the automobile production or auto parts manufacturing industry, the production of a finished product is often assembled by a variety of parts. For example, for automobile vehicle production, it is composed of all kinds of assembly and optional parts to form a vehicle, and for auto parts manufacturing, it is assembled into a finished product by all kinds of materials. Such a production mode has the following characteristics:

1: Different materials are assembled to form different finished products

2: All kinds of optional parts or material sets come from different suppliers

3: The production line needs to realize the mixed production mode

4: The same station can operate and produce finished products of different specifications

Ii: MES system software requirements description

This creates a requirement for quality control of the production line, i.e. how to ensure that each production operation is correct, including the correct installation of the optional parts/assemblies, the correct installation status of the current finished product, and whether the current finished product is defective. If the production and assembly operation is incorrect, it shall be handled in time to avoid the flow of defective finished products into subsequent sections or wrong reporting.

The realization of this requirement needs to involve MES system software data acquisition, production control and other modules. In other words, data is collected for each production operation at the station, and the data is submitted for inspection. According to the submitted results, the current operation steps are determined, as well as the retrospective treatment of defective products. This can ensure the reliability of production operation of each section, realize the mixed production mode, and improve the yield.

Three: MES system software solutions

From MES system software, the quality control of the entire production line can be completed by a series of functional modules:

1: Position trigger >2: data collection >3: data processing >4: status judgment >5: device control

Position trigger

It means that the workpiece (such as vehicle) on the pipeline arrives at a certain station and starts to trigger the data acquisition operation. In the vehicle production line, photoelectric switch or proximity switch is generally used to judge the vehicle's position status, which can automatically trigger the operation of data acquisition equipment for data acquisition. Another simple model is for the operator to manually trigger the data acquisition device.

Data acquisition

It is mainly used to collect finished product information, material component information, and workpiece assembly status data. Acquisition methods can be various, including RFID technology, laser bar code scanning, all kinds of sensor equipment, network camera equipment, and can be manually input data by the operator and other ways for data acquisition.

Data processing

The main function of data processing is to submit the collected "field" data to the preset "background" data (such as BOM or process set value) for inspection, and obtain the inspection result. In addition, it also includes the data interaction between equipment and equipment, equipment and system, and system and system, such as transmitting the collected data to the background system interface or data output device through a certain communication mode.

State judgment

According to the data processing results, determine the production and assembly status of the current station or previous station according to the predetermined workflow, such as missing assembly, misassembly, or other anomalies. If the status is correct, subsequent data processing will be carried out. For example, the collected material and component data will be bound to the finished product and enter the next process. If the status is incorrect, it enters the exception handling mechanism and prompts the operator or workshop manager to handle it.

Equipment control

Judge the result according to the status and control the production equipment according to the business logic; In the case of abnormal state can be controlled by PLC line stop, shut down production tools, or indicator light red alarm prompts the field operator, but also through the background monitoring program real-time notification workshop management personnel. After the operator or workshop management completes handling the exception, the production is released.

From the whole MES system software architecture level, the structure of these modules is as follows:

ERP system (BOM data)

MES System Software (workflow control, data processing)

Field terminal (data acquisition input, data processing, output)

Production equipment (data acquisition equipment, PLC and other production equipment)

Four: MES system software technology, product application

In the concrete implementation, these functional modules may involve the deployment and design of a variety of technologies and products

MES system software hardware part

1: Data acquisition equipment: laser bar code scanning equipment, RFID reading and writing electronic label equipment, all kinds of sensors, camera equipment, etc

2: Data communication equipment: fieldbus, Ethernet equipment, data acquisition card, etc

3: Production control equipment: all kinds of PLC modules, industrial control terminal equipment, switches, industrial indicator equipment, etc

4: Data display equipment: LED display equipment, monitoring equipment, etc

5: Other system equipment: all kinds of system servers, database servers, etc

MES system software software part

1. Design of data interface of background ERP system

2: MES system software workflow design, as well as data input, processing and output functions.

3. Design of field operation interface/function of field terminal, including data interaction with production equipment, data input, processing and output functions.

4: Production equipment control, including PLC programming, equipment control function and data reading and writing function.

5: Data communication mode, including the design of various communication protocols, device-device, device-system, system-system communication interface design.

Five: MES system software summary

The above content roughly describes the application of MES system software in the production line quality control management. For specific business characteristics, it can be further refined to form a targeted technical solution.