Inspection method of stamping parts

Stamping is a forming and processing method of applying external force to plates, strips, pipes and profiles through presses and dies to produce plastic deformation or separation, so as to obtain workpieces (stampings) of desired shape and size. Stamping and forging belong to plastic processing (or pressure processing), collectively referred to as forging. Stamping blanks are mainly hot-rolled and cold-rolled steel plates and strips. Test method: Touch and check the surface of the outer cover with clean gauze. The inspector should wear touch gloves and 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, the suspicious area can be polished with oilstone and verified, but this method is an effective and fast inspection method. Grinding with Whetstone 1. First clean the surface of the outer cover with a clean gauze, and then polish it with a whetstone (20×20×100mm or larger), and polish the arc and the surface with a relatively small whetstone (such as 8×100mm semi-circular oilstone) Hard-to-reach places 2. The choice of whetstone particle size depends on the surface conditions (such as roughness, galvanizing, etc.). ). It is recommended to use fine-grained oilstone. The grinding direction of the whetstone is basically along the longitudinal direction, and it has a good fit with the surface of the stamping parts, and some special places can be supplemented by horizontal grinding. Flexible gauze polishing. Wipe the surface of the outer cover with clean gauze. Press the surface of the stamping part with a flexible sand net and grind it to the entire surface in the longitudinal direction. Any pitting and indentation are easy to find. Refueling check Wipe the surface of the outer cover with clean gauze. Then use a clean brush to apply oil evenly on the entire outer surface of the stamping in the same direction. Place the stamped parts coated with oil under strong light for inspection. It is recommended that the stamped parts be erected on the 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. The inspection fixture puts the stamping parts into the inspection tool, and inspects the stamping parts according to the operating requirements of the inspection tool manual. Production problems, safe production. In actual production, process tests similar to the stamping process are often used, such as deep drawing performance test, bulging performance test, etc., to check 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 extends the production preparation time for new stamping parts. Standardization and development of mold bases, mold bases and guide rails, simple molds (for small batch production), composite molds, multi-station progressive molds (for mass production), and the development of rapid mold change devices can reduce stamping The amount of preparation for production and shortening the preparation time are suitable for reducing the amount of preparation for stamping production and shortening the preparation time. In addition to using hydraulic presses to form thick plates, stamping equipment generally uses mechanical presses. Transportation and other machinery, mold bases and quick mold change devices, controlled by computer programs, can form an automated stamping production line with high productivity. When producing dozens or hundreds of stamping parts per minute, the processes of feeding, stamping, discharging, and discharging waste are completed in a short time, which often leads to personal, equipment, and quality accidents. Therefore, the safety of stamping production is a very important issue. In the stamping process of general workpieces, because the temperature will rise rapidly during the stamping process, especially in the cold forging stamping process, lubricating products must be added for lubrication. If lubrication is not used, stamping, welding and assembling can be carried out directly, and the parts without oil on the surface are convenient for welding and assembling. Research and practice show that the application of IMCO metal inert gas shielded welding, tungsten gas shielded welding and resistance welding has achieved good results. Related news: The characteristics of the main materials of stamping parts, the handling of common problems of stamping parts, the characteristics of scaffolding stamping parts and the importance of inspections