Processing unit based on group technology We have adopted a machining unit organization form in the machine shop in the technology relocation project of a chassis accessory manufacturing company. The company mainly produces independent suspension systems and brakes. The original processing production is divided into multiple workshops. Due to the limitations of the original site, the workshop layout is relatively decentralized, and the main production organization in the workshop is the cluster layout, resulting in production logistics. Crossing roundabouts increases logistics costs. This time due to the opportunity of relocation and technological transformation, the company hopes to expand its production capacity while improving its management level and gradually realize ERP management.

Through the analysis of the product and production process of the plant, it was found that the main processing parts such as ball pins, spherical pins, joints, and ends of the plant have structural, material similarity, and process similarity, and that they are large in quantity and are suitable for group processing technology. .

The analysis is now conducted in a production workshop that independently hangs the lever arm. The workshop is divided into joint processing area, end processing area, spherical pin processing area and so on in accordance with the similarity of parts structure and the principle of technological similarity. Each district is divided into 23 processing units according to the product's production program, which is conducive to the company's ability to replicate and expand its production capacity according to its own capabilities and market requirements. Take the spherical pin processing as an example. The blank of the part is an external forging into the blank library. The part machining is done by drilling the center hole (double-sided center hole machine) y rough car stem part and round ball (copying lathe) y drilling (drilling machine ) y Precision car parts and ball (CNC lathes) are cleaned and inspected before entering the warehouse. The machine layout of the spherical pin machining unit is U-shaped.

This group of processing units can complete the production capacity of 100,000 pieces per year, and can replicate units as the production program expands. The use of material trolleys in the processing unit processes, the logistics basically flows in closed production units, and the processing of various types of machine tools. The ability to get a relatively balanced, can greatly reduce the waiting time; CNC lathe operation using a person to take care of the two devices at the same time, improve the equipment while watching the coefficient. It can be seen that the use of this kind of layout scheme has significantly improved logistics and reduced production costs.

Enterprises transformed after modern production management based on group technology need to implement ERP system to integrate enterprise resources and improve management level. Grouped production units access ERP systems through information technology and built the foundation for modern management. As shown, the entire production management system is centered on ERP, and dispatch management is performed based on the principle of priority of dispatch/distribution 0/stock minimum 0. The processed parts are converted from the CAD system to the ERP required information through the product data management system; the production management system interacts with the ERP data to determine the process route, working hours quota, and tools according to the group technology or computer-aided process design (CAPP). The machining task is assigned to the corresponding machining unit. As a result, the shop plans to replace the original process management with the management of similar parts; the quality management is mainly controlled by the inspectors to be transformed into the automatic control of the processing units; and the workers are developed from one person to one machine to one person and multiple machine tools. The processing unit serves as the basis of the flexible manufacturing system (FMS), which simplifies the production planning and scheduling and improves the flexibility and work efficiency of the workshop production.

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