Tungsten carbide drawing die occupies a very large proportion in the entire stamping die industry. Our common cups, motor housings and almost most products have more or less products that need to be stretched. The design of the drawing die does not mean that it can be calculated according to conventional algorithms. There are too many processes full of variables, especially the stretching of some non-rotating bodies, which is prohibited.
Because there are too many factors to consider when designing the drawing die, such as the drawing coefficient, whether it reaches the material limit, the decision of the spring force, the drawing direction, whether to pull up or down, often it cannot be formed at a time and requires multiple tests. In order to achieve the desired effect, sometimes the mold may be scrapped. Therefore, the continuous accumulation of experience in practice is of great help to the design of the drawing die.
In addition, the size of the cutting material also played an important role in the trial production of the entire tungsten carbide drawing die. Therefore, when designing some irregular deep drawing parts, a blank is often reserved in the mold design stage.
1. Stretching material
When the customer's requirements for the material are not very high, and the repeated mold trials do not meet the requirements, you can change to a material with good tensile properties and try again. Good materials are half the battle. For stretching exercises, this cannot be ignored. Cold-rolled thin carbide sheets for drawing mainly include 08Al, 08, 08F, 10, 15, and 20 carbides. The largest is 08 carbide, which is divided into boiling carbide and killed carbide. The rimmed carbide has low price and good surface quality. The segregation is more serious, and there is a trend of "restraint and aging". Not suitable for parts that require high stamping performance and appearance. Killed carbide is better and has uniform performance, but the price is higher. The representative brand is aluminum-killed carbide 08Al. The foreign carbide adopts Japanese SPCC-SD deep drawing carbide, which has better tensile properties than 08Al.
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