Selection of drawing parts for automobile
(1) the production of tensile parts as far as possible the use of standard mold base, and norms of the type and specification of the mold frame on the decision of the type and specification of the next block. If the demand for self-planning mold base, the diameter of the circular die block should be larger than the concave template diameter 30 ~ 70mm, rectangular die seat length should be larger than the concave template 40 ~ 70mm, the width can be slightly larger or equal to the width of concave template . The thickness of the mold base can be determined with reference to the standard mold base, usually 1.0 to 1.5 times the thickness of the concave formwork to ensure that the strength and rigidity are satisfied. On the large non-standard mold base, it is also necessary according to actual needs, according to the technical requirements of casting and casting layout planning specifications for planning. (2) the selection or planning of the mold block must be selected with the press bench and slide the appropriate scale, and the necessary checks. For example, the mold under the seat of the smallest general scale, should be than the press platform on the leak hole size of each side of at least 40 ~ 50mm. (3) Die-Block data are usually selected HT200, HT250, can also use Q235, Q255 layout steel, mold on the large-scale selection of mold cast steel ZG35, ZG45. (4) Die Block, the parallel appearance of the upper and lower should reach the demand, the parallel degree of public service is usually four. (5) upper and lower die sets of guide sleeve, guide column device hole in the distance from the common need, the accuracy is usually required ± 0.02mm below; die seat guide post, guide sleeve device hole axis should die seat, Straight under the plane, the device sliding guide pin and guide sleeve, the straightness of public service is usually four. (6) Die surface of the upper and lower surface roughness Ra1.6 ~ 0.8μm, to ensure the parallelism of the premise, can be agreed to drop to Ra3.2 ~ 1.6μm. Pad: The role of the plate is to directly accept and disperse the pressure of the convex touch transfer, to reduce the unit pressure suffered by the mold base, to avoid the mold seat is partially depressed, pad dimensions and die, the fixation Also use screws and pins fixed.
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