Precision stamping and ordinary stamping are completely different. The minimum value of the hole diameter and hole margin of precision stamping parts is smaller than that of ordinary stamping. Therefore, when designing precision stamping parts, there are certain requirements for the design of the structure.
When designing the structure of precision stamping parts, the shape of the workpiece and the inner hole should be rounded, and sharp corners are not allowed. However, the minimum allowable corner radius value is related to the material thickness. The punching diameter, slot width and edge distance of the workpiece should not be too small. When precision stamping gears, the pitch circle tooth width of the gear should not be less than 0.6T, and the top and root of the tooth shape should be a rounded transition, not a sharp transition. The contour shape of the outer edge of precision stamping parts should be as smooth as possible, and should not change suddenly. On the surface of the workpiece, design symbols or marks, and when pressing, the cutting depth should not exceed 0.25T.
In general, the production of precision stamped workpieces is mainly based on strong blanking and fine blanking. The geometry, dimensional tolerances, geometric tolerances and shear surface quality of fine blanked workpieces are much higher than those of ordinary blanked workpieces.
The most commonly used materials in the production of precision stampings are metallic materials (including ferrous and non-ferrous metals), but sometimes non-metallic materials are also used.
Among them, ferrous metals mainly include ordinary carbon structural steel, high-quality carbon structural steel, alloy structural steel, carbon tool steel, stainless steel, electrical silicon steel, etc.; non-ferrous metals mainly include pure copper, brass, bronze, aluminum, etc.; there are many Metal materials and models. How can we choose materials, not only to ensure the quality of the workpiece, but also save materials?
When manufacturers of precision stamping parts choose stamping materials for drawing parts, they generally have the following principles:
Metal materials must meet the performance requirements of the workpiece; stamping parts work normally in machines or parts and have a certain service life.
The selected material must have good process performance; for any kind of stamping part, the selected material should be able to meet the requirements of the stamping process.
The selected material should have good economy; under the premise of meeting the performance and stamping process requirements, the material should be low in price, convenient in source and economical to reduce the cost of stamping parts.
The above are the principles that manufacturers of precision metal stamping parts should follow when choosing metal stamping materials. Hope the above content is helpful to readers.Read More →