CIMS technology in PCB assembly

- Nov 17, 2018-

Surface mount technology (SMT) is being rapidly adopted in the domestic PCB assembly industry, and the domestic STM production line has reached more than 10,000.All the important processing equipment in PCBA industry are computer controlled automatic production equipment.These automated processing equipment in the production of a printed circuit board (PCB) before all needs to programmers spend quite a long time for data preparation and programming, and the vast majority of electronic products manufacturers, especially with independent development and design ability of high and new technology enterprise with product updates fast, the characteristics of many varieties, small batch production, which requires the processing equipment of the production preparation time is short, the effective production time is long, to adapt the demand of the production characteristics and shorten the cycle of product research and development - the market.How the CAD design system and automatic production equipment, to establish an organic information integration and sharing between the design automation and production automation of these "islands automation" for information on the connection, demolition "partition" between product design and manufacturing, is exactly what computer integrated manufacturing system (CIMS) technology to solve the problem.

In the PCBA industry, the entity of CIMS system is built on the factory computer network and database, which is a paperless manufacturing information system that can improve the quality, capacity and output of circuit assembly.The system can control and monitor screen printing machine, glue machine, patch machine, plug machine, test equipment and other assembly line equipment.Once a problem occurs, CIMS can feed back information to the operator or process engineer and indicate the exact location of the problem.A relatively complete CIMS system should have the following four elements:

Firstly, the system should realize the information integration of CAD and computer aided manufacturing (CAM), which is the most basic part of CIMS system.Information integration between automatic design and automatic manufacturing subsystem can help realize automatic conversion of CAD data to manufacturing data required by production equipment, namely automatic programming.This feature makes it relatively easy to switch products on the production line.Once online products have conversion requirements, they can be automatically reflected to the machine programs, test data and documents through the CIMS system without the need to program or modify the Settings separately for each device.This article will focus on how to implement CAD/CAM integration in a later section.

Secondly, CIMS should provide manufacturability analysis and testability analysis tools.Through CAD file from the design department for manufacturability analysis, in violation of the principle of SMT feedback to design system, can promote the concurrent engineering design and manufacturing system, improve the design of a success, and testability analysis tools can provide the designer with a complete detectable rate analysis report, in order to effectively arrange test and inspection resources rationally, and help to design engineers improved measurability design of the product.

Thirdly, CIMS can provide a reference for production scheduling. By taking into account the parameters such as the product to be assembled, machine occupancy and delivery cycle requirements, etc., through comprehensive analysis, the system will maximize production and assembly efficiency.CIMS can be used for direct short-term scheduling or long-term strategic consideration of plant capacity.

Finally, CIMS should be helpful to balance production lines and process optimization.One of the key features of CIMS is to optimize assembly by automatically balancing product loading and sequencing, component allocation and mounting, and equipment speed.At the same time, the system should be able to make a reasonable choice between allocating parts to the right machine or manual assembly.

With the help of relevant national institutions, China has established many typical application projects of CIMS in the machinery manufacturing industry. Beijing machine tool factory and huazhong university of science and technology have won the international CIMS promotion and application award, marking that China has entered the international leading level in CIMS research and development and promotion.But few factories in the electronics manufacturing industry actually carry out CIMS engineering.

Recently, SMT technology is being adopted rapidly in domestic PBCA industry. In recent years, tens of thousands of advanced SMT automatic production lines have been introduced, which are basically computer-controlled automatic equipment, creating favorable conditions for PCBA industry to carry out CIMS engineering.

In view of the specific situation of China's PCBA industry at present, we accept the experience and lessons of CIMS implementation in the machinery industry in recent years. The implementation of CIMS engineering in the PCBA industry does not have to cover all aspects. The key is the application of CIM.The application of CIM technology in the PCBA industry enables the enterprise to have the characteristics of multi-variety and small-batch production, improve the ability of the enterprise to respond to market changes quickly, and thus enhance the competitiveness of the enterprise in the large-scale global production.

From the PCB design to complete assembly, CIMS for PCBA manufacturer provides a powerful tool, regardless of different kinds of components, the type of substrate, the size of the PCB, adopted technology, CIMS can provide complete solution, at the same time, ties of CIMS or heterogeneous equipment integration, for the product rapid transformation, the improvement of the quality and yield.