PCB circuit board technology, including computer-aided manufacturing process technology, that is, CAD / CAM, as well as light painting technology. The following describes the computer-aided manufacturing process technology

Computer-aided manufacturing (CAM) is based on a given process for a variety of process. Before the various technical requirements mentioned, we must make the necessary preparations before the light painting. Such as mirroring, solder mask expansion, process line, process box, line width adjustment, center hole, contour lines and other issues must be completed in this CAM process.

Special attention should be paid, the user file spacing is too small, must make the appropriate treatment. Because each factory process and technology vary, to meet the final requirements of users must make the necessary adjustments in the production process to meet the user requirements for accuracy and other aspects.

Therefore, CAM processing is an essential process in the manufacture of modern printed circuit boards.

one. CAM done by the work

1. Pad size correction, combined D code.

2. Line width correction, combined D code.

3. Check the minimum spacing between the pad and pad, pad and line, between the lines and lines.

4. Aperture size check together.

5. The minimum line width check.

6. Determine the solder mask expansion parameters.

7. Mirror.

8. Add a variety of process lines, process box.

9. Line width correction for side eroded

10. Formation of the center hole.

11. Add the outline of the shape.

12. plus positioning hole.

13. Imposition, rotation, mirroring.

14 pieces.

15. Graphic overlay processing, chamfer tangent processing.

16. Add user mark.

two. CAM process organization

As there are dozens of popular CAD software available in the market, management of the CAD process must first start with the organization, and a good organization will achieve a multiplier effect.

As the Gerber data format has become the standard of light painting industry, Shanghai SMT manufacturers should therefore take Gerber data as the processing object in the entire photoprocessing process. If the CAD data for the object will bring the following questions.

1. There are too many types of CAD software. If all kinds of technical requirements are to be completed in CAD software, each operator should be proficient in the operation of each kind of CAD software. This will require a long training period in order for the operator to become a skilled worker in order to meet the actual production requirements.

This is uneconomical from a time and economic point of view.

2. Due to the variety of process requirements, some requirements are not achievable with some CAD software. Because CAD software is designed for use, does not take into account the special requirements of the process, which can not meet all the requirements. The CAM software is designed for process processing,

It is best to do these things.

3. CAM software powerful, but all Getber files to operate, and can not CAD files.

4. If using CAD for process, each operator must be equipped with all the CAD software, and for each CAD software have different process requirements. This will cause unnecessary confusion in management.

In summary, CAM organizations should be the following structure (especially large and medium-sized enterprises).

        (1) All process processes are unified with Gerber data as the processing object.

        (2) Each operator must master the CAD data into Gerber data tips.

        (3) Each operator must master the operation method of one or several kinds of CAM software.

        (4) Develop a uniform process specification for Gerber data files.

CAM processes can be relatively centrally handled by several operators for management. Reasonable organization will greatly improve the management efficiency, production efficiency, and effectively reduce the error rate, so as to achieve the effect of improving product quality.