Wipe the surface of the cover with clean gauze. Inspectors need to wear touch gloves to touch the surface of stamping parts in the longitudinal direction. This inspection method relies on the inspector's experience. If necessary, the suspected area can be polished with oilstone and verified, but this method is an effective and rapid inspection method.
Second, whetstone grinding.
1. Wipe the surface of the outer cover with clean gauze first, then polish it with an oilstone (above 20×20× 100mm), and polish it with a relatively small oilstone (for example, a semicircular oilstone of 8× 100mm) where there are arcs and it is difficult to reach.
2. The choice of oilstone particle size depends on the surface conditions (such as roughness, zinc plating, etc. ). It is recommended to use fine-grained oilstone. The grinding direction of oilstone is basically along the longitudinal direction, which fits well with the surface of stamping parts, and can be supplemented by horizontal grinding in some special places.
Step 3, polishing the flexible gauze.
Wipe the surface of the cover with clean gauze. The flexible sand net clings to the surface of stamping parts and is polished to the whole surface along the longitudinal direction, and any pits and indentations are easy to find.
Four, oiling inspection
Wipe the surface of the cover with clean gauze. Then use a clean brush to evenly coat the oil on the entire outer surface of the stamping part in the same direction. Check the oiled stamping parts under strong light. It is recommended to erect the stamping parts on the body position. In this way, tiny pits, dents and ripples on stamping parts can be easily found.
Verb (abbreviation of verb) appearance test
Visual inspection is mainly used to find abnormal appearance and macro defects of stamping parts.
Six, fixture detection
Put the stamping parts into the fixture, and check the stamping parts according to the operation requirements of the fixture manual.
Seven. Production problems and safety production
In actual production, process tests similar to stamping process, such as drawing performance test and bulging performance test, are often used to check the stamping performance of materials to ensure the quality of finished products and high qualified rate.
The precision and structure of the die directly affect the forming and precision of stamping parts. Die manufacturing cost and life span are important factors affecting the cost and quality of stamping parts. Mold design and manufacture need more time, which prolongs the production preparation time of new stamping parts.
The standardization of die frame, die frame and guide rail, the development of simple die (small batch production), compound die and multi-station progressive die (large batch production) and the development of rapid die changing device can reduce the preparation workload and shorten the preparation time of stamping production, so that advanced stamping technology suitable for large batch production can be reasonably applied to small batch and multi-variety production.
In addition to forming thick plates with hydraulic press, stamping equipment generally adopts mechanical press. Conveying machinery, mold base library and quick mold changing device are controlled by computer programs, which can form an automatic stamping production line with high productivity.
In the case of producing dozens or hundreds of stamping parts per minute, people, equipment and quality accidents often occur when feeding, stamping and discharging processes are completed in a short time. Therefore, stamping safety production is a very important issue.
Generally, in the stamping process, the temperature of the workpiece will rise rapidly, especially in the cold forging stamping process, it is necessary to add lubricating products for lubrication. If the workpiece is directly stamped and welded, lubrication is not needed, and the parts without oil on the surface are convenient for welding and assembly. The research and practice show that the application of Aimeike metal inert gas shielded welding, tungsten gas shielded welding and resistance welding has good results.