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Testing Method

- Sep 10, 2018 -

Testing method

Touch test
Wipe the surface of the outer cover with clean gauze. The inspector is required to wear a touch glove to touch the stamped surface along the longitudinal direction of the stamping. This method of inspection depends on the inspector's experience. When necessary, oil stone can be Used to polish and detect the suspected area, but this method is an effective and quick method.

Whetstone polishing
1. First wipe the surface of the outer cover with clean gauze, then polish with oil stone (20×20×100mm or larger), place with arc and hard to wear with relatively small oil stone (For example: 8×100mm semi- Circular oilstone)
2. The choice of particle size depends on the surface condition (eg roughness, galvanizing, etc.). Fine-grained oilstone is recommended. The direction of the stone grinding is basically in the longitudinal direction, and it fits well with the surface of The stamping part, and some special places can also complement the lateral grinding.
Flexible gauze grinding
Wipe the surface of the outer cover with clean gauze. The surface of the stamping part is sanded to the entire surface in a longitudinal direction by a flexible sand net, and any pitting and indentation can be easily found.
Oil test
The use of a clean brush to evenly apply oil to the entire outer surface of the stamping in the same direction. The oil-coated stampings are placed under strong light and it is recommended that the stamped With this method, it is easy to find tiny pittings, ponds, and corrugations on the stampings.
Visual inspection
Visual inspection is mainly used to find the appearance abnormalities and macro defects of stamping parts.
Gauge inspection
The stamping part is placed in the inspection tool, and the stamping part is originated to the operation requirements of the inspection tool manual.
Production problem safety production
In actual production, the process test to the stamping process, such as the drawing performance test and the bulging performance test, is used to test the punching performance of the material to ensure the quality of the finished product and high qualification rate.
The precision and structure of the mold directly affects the forming and precision of the stamping. Mold manufacturing cost and life are important factors affecting the cost and quality of stamping parts
Stamping equipment

Mold design and manufacturing require more time, which extends the production lead time for new stampings.
Standardization of mold bases, formwork, 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 to reduce the workload of stamping production preparation And shortening the preparation time, it can be applied to reduce the workload of press production preparation and shorten the preparation time, and the advanced stamping technology suitable for mass production can be reasonably applied to small batch and multi-variety production.
In addition to the forming of the heavy plate water press, the stamping equipment generally uses a mechanical press. Conveying and other machinery as well as mold libraries and rapid mold change devices, and using computer program control, 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, discharging waste, etc. are completed in a short time, and personal, equipment and quality accidents often occur. Stamping is a very important issue.
Generally, in the stamping process, the temperature will rise rapidly during the stamping process, especially in the cold forging stamping process. Lubrication products must be lubricated. If the lubrication is not used, the stamping, welding-assembly, and oil-free surface The parts are easy to solder and assemble. Research and practice have shown that Amy's metal inert gas arc welding, tungsten gas shielded arc welding, and resistance welding have excellent results.

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