Touch inspection
Wipe the surface of the outer cover with clean gauze. The inspector needs to wear touch gloves to touch the surface of the stamping part along the longitudinal direction of the stamping part. This inspection method depends on the experience of the inspector. If necessary, oilstone can be used to polish the detected suspicious area and verify it, but this method can be regarded as an effective quick inspection method.
Whetstone polishing
1. First, wipe the surface of the outer cover with a clean gauze, and then polish with oil stone (20×20×100mm or larger), and polish with relatively small oil stone in the arc and hard-to-reach places ( For example: 8×100mm semi-circular whetstone)
2. The choice of whetstone particle size depends on the surface condition (such as roughness, galvanizing, etc.). It is recommended to use fine-grained oilstone. The direction of whetstone grinding is basically along the longitudinal direction, and it fits well on the surface of the stamping parts, and some special places can also be supplemented with horizontal grinding.
Flexible gauze polishing
Wipe the surface of the outer cover with clean gauze. Use a flexible sand net to close the surface of the stamping part and grind it to the entire surface in the longitudinal direction. Any pitting or indentation will be easily found.
Oil inspection
Wipe the surface of the outer cover with clean gauze. Then use a clean brush to apply oil evenly to the entire outer surface of the stamping in the same direction. Put the oiled stamping parts under strong light for inspection. It is recommended that the stamping parts be erected on the car body. This method can easily find tiny pits, pits, and ripples on the stamping parts.
Visual inspection
Visual inspection is mainly used to find abnormal appearance and macro defects of stamping parts.
Inspection fixture
Put the stamping parts into the inspection tool, and inspect the stamping parts according to the operating requirements of the inspection tool manual.
Production problems and safety in production
In actual production, process tests similar to the stamping process are commonly used, such as drawing performance test, bulging performance test, etc. to test the stamping performance of the material to ensure the quality of the finished product and a high pass rate.
The precision and structure of the mold directly affect the forming and precision of the stamping parts. Mold manufacturing cost and life are important factors that affect the cost and quality of stamping parts. Mold design and manufacturing require more time, which prolongs the production preparation time of new stamping parts.
Standardization of mold bases, mold bases, and guides and development of simple molds (for small batch production), composite molds, multi-station progressive molds (for mass production), and the development of rapid mold change devices, which can reduce the workload of stamping production preparations And shortening the preparation time can make it suitable for reducing the amount of preparation for stamping production and shortening the preparation time, so that the advanced stamping technology suitable for mass production can be reasonably applied to small batch and multi-variety production.
In addition to forming thick plates with hydraulic presses, stamping equipment generally uses mechanical presses. Conveying and other machinery, as well as a mold library and a quick mold change device, and controlled by a computer program, can form a high-productivity automatic stamping production line.
In the case of producing dozens or hundreds of stamping parts per minute, the processes of feeding, stamping, discharging, and discharging waste are completed in a short time, and accidents of personal, equipment and quality often occur. Therefore, safe production in stamping is a very important issue.
Generally, in the stamping process, the temperature of the workpiece will rise quickly during the stamping process, especially in the cold forging stamping process, and it must be lubricated with lubricating products. If lubrication is not used, it will be stamped directly, welded-assembled, and there is no oil on the surface. The parts are easy to weld and assemble. Research and practice show that Amicable Metal Inert Gas Arc Welding, Tungsten Gas Shielded Arc Welding, and Resistance Welding have excellent results.
