Here is a Progressive Stamping Die Factory talking about the main point of designing a good mold.
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First, the tensile material
When the customer's requirements for the material are not very demanding, and the repeated test can not meet the requirements, you can try another material with good tensile properties. The good material is half of the success. For stretching, it cannot be ignored. The cold-rolled steel sheets for stretching mainly include 08AI, 08, 08F, 10, 15, and 20 steels. The largest steel used is steel No. 08, which is divided into boiling steel and killed steel. The price of boiling steel is low, and the surface quality is good. However, the segregation is more serious and has the tendency of strain aging. It is not suitable for parts with strict requirements on stamping performance and high requirements. The steel is better, the performance is uniform but the price is higher. The representative grade is aluminum killed steel 08AI. For foreign steel Through Japan SPCC SD deep drawing steel, its tensile performance is better than 08AI.
Second, the luminosity of the mold surface
When deep drawing is performed, the two sides of the die and the bead ring are not sufficiently ground, especially when the stainless steel plate and the aluminum plate are drawn, the deep drawing is more likely to be generated, and the tensile fracture is caused in a serious case.
Third, the determination of the ring size
More wrinkles, less cracking is our principle, the blank positioning design should be correct, the shape of the simple rotating body tensile part of the blank diameter in the constant thin stretch, although the material thickness changes, but the basic and original thickness + The points are close, which can be calculated according to the principle that the blank area is equal to the area of the stretched piece (if trimming must be added with the trimmed star). However, the shape and process of the stretched parts are often complicated, and sometimes the stretch is stretched. Although there are many 3D softwares that can be used for the calculation of the unloading material, the accuracy cannot be 100%.
Fourth, the stretching coefficient m
The stretch factor is one of the main process parameters in the calculation of the drawing process, which is commonly used to determine the order and number of times of stretching.
There are many factors affecting the tensile coefficient m, including material properties, relative thickness of the material, stretching method (referring to the presence or absence of the bead ring), number of stretching, stretching speed, radius of the concave and convex mold, lubrication, and the like.
The calculation and selection principle of the tensile coefficient m is the key point introduced in various stamping manuals. There are many methods such as calculation, table lookup, calculation, etc. It is also a good choice. I also choose according to the book and caress the fresh stuff. Please read the book.
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