Constraints on product design and manufacturing process selection in modular manufacturing systems:
(1) Process selection: all parts must be machined by processing basic primitives;
(2) Cycle requirements: As long as possible, all parts must be “JIT†“JIP†“manufacturing;
(3) Quality and reliability: All operations and processes must be selected with almost 100% reliability;
(4) Operation and assembly: All components are processed and assembled using simple and practical units built on modular drive units;
(5) Raw material costs: Resolutely eliminate unnecessary expensive raw materials.
Modular manufacturing system design begins with “extracting†information from product designs related to modular manufacturing systems. The product description for the modular manufacturing system design is primarily a product structure analysis table.
In the modular manufacturing system design, the number of modules of the processing machine primitives must first be determined according to the product batch size and the complexity of the product. This requires identifying which processing machine primitives result in a sub-assembly line with a production cycle that is lower than the cycle required for the production output rate. If the production cycle of a processing machine primitive is too low, the number of processing machine primitive units is increased until the required production cycle is reached. The design of the modular manufacturing system defines the number and ordering of the processing machine primitive modules from the product design (ie assembly command), assembly process, and modular manufacturing system production cycle requirements.
The significance of modular manufacturing system to the development of China's manufacturing industry
Modular manufacturing systems meet the requirements of process integration and system reconfiguration. Process integration emphasizes high efficiency, which requires the integrated modules of the manufacturing system to be versatile dedicated machine tools that perform multiple tasks in the manufacturing process. System refactoring emphasizes high flexibility, which can be achieved by reconfiguring the machine equipment and some of the modules in the machine. Modular manufacturing systems can significantly reduce the functional constraints of the product on the manufacturing system and increase productivity by reducing non-processing periods, allowing manufacturing systems to survive in the fast technology and market changes of the future.
Because the modular manufacturing system can realize large-scale customized production of a large class of products at a low cost, it is of great significance for the development of China's manufacturing industry, the competitiveness of China's manufacturing enterprises and the ability to mass-produce custom production. By rapidly reconfiguring modular manufacturing systems, companies can quickly produce products that meet market demands. Companies can also help build modular production lines with manufacturing module leasing companies to quickly bring new products to market.
In the past, China had engaged in combination fixtures and established a number of combined fixture stations. Due to poor information transmission, it is often difficult for enterprises to quickly know the specifications of the combined fixtures when designing the fixtures. How to combine the fixtures required by them and where to get the combination fixtures quickly, the result is that the development of the combination fixtures is frustrated.
The development of modular manufacturing systems should combine product design and modular manufacturing systems, and use computer and network technologies to support product design and modular manufacturing system design, integrating the two to truly face the manufacturing-oriented design. The use of network technology can also enable product designers and craftsmen who are located everywhere to quickly know the module type, storage location, combination method and other information of the manufacturing system, and know the manufacturing cost of the product. This avoids the frustrations of past combined fixtures.
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