Is the stamping tool to be used for the precision of the stamping parts? Why is that?
The main dimension of the punching die is on the punch, and the gap is on the concave. The base size of the falling material is on the concave, and the clearance is on the punch. The dimensions of the two are in different directions; The tolerance of the punching die is usually positive, because the hole is generally positive and the hole can be large. The tolerances of falling materials are generally negative and can be small. So, if you want to use the punching mode to produce the falling material, the material will be large, which will affect the assembly and assembly of the parts. So, if you are strict, you can't use the punch to make the material.
The punching and falling are two different processes, although they seem to have been achieved, and the smaller ones are separated from the larger ones. The punching process, which requires the size of the detached surface of the large material, is a waste material; The drop process - the size of the small piece of material that is separated, the small material is the product. Die design of the punching process - the main die is the punch mould; The tooling that implements the localization is relatively complicated; Mold design of the blanking process - the base mode is the concave mold. Because of the emphasis on the process of punching and falling materials, the processing and placement of the material in the process of processing and resettlement are also different.
In general, it is possible to look at the precision of the product requirements. This type of mould to the flatness of the main problem is falling materials problem, if the flatness requirement is strict, it must be on the top of the lower die shear engineering with strong spring, shear process ensure the punch material is within the scope of clamping incised, punch height is just right across the material thickness can be half a (theoretical value, can adjust the height). This station is called "half cut back", will fall with CARDS in the next work is expected to bring was taken to a station by the punch shot down, the flatness of the product will be effectively controlled.
As for accuracy, for example, a round piece, 10mm in diameter, iron material with a thickness of 1.0. Because is the materials for the product, so the size of the circle is determined by the size of the lower die inner hole, lower die blade diameter of 10.00 mm, according to the calculation of blade gap, unilateral clearance should be 1.0 * 0.05 = 0.05 mm, so the punch diameter is 9.90 mm. And you said that the precision of the pledge is also need precision mold parts, then see how the parts are processed, such as wire cutting, fast wire cutting and slow wire cutting, the precision of plus or minus 0.02 mm, the latter is plus or minus 0.002 mm. The difference is 10 times, the part accuracy that makes is of course different, the size of the product that is processed, the size of the margin of the hair side is different also.
