Selection and planning of drawing parts-precision

The selection and planning method of drawing parts: (1) As far as possible, standard mold bases should be used for the production of drawing parts, and the type and specification of the standard mold base determines the type and specification of the upper and lower mold bases. If you need to plan the mold base yourself, the diameter of the circular mold base should be 30~70mm larger than the diameter of the concave template, and the length of the rectangular mold base should be 40~70mm larger than the length of the concave template, and its width can be slightly larger or equal to the width of the 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 template to ensure satisfactory strength and rigidity. Regarding large non-standard mold bases, it is also necessary to plan according to actual needs, technical requirements of castings and casting layout planning specifications. (2) The selected or planned mold base must be compatible with the relevant dimensions of the working table and sliding block of the selected press, and necessary checks must be carried out. For example, the small general size of the lower mold base should be at least 40-50mm larger on each side than the size of the leakage hole on the press workbench. (3) Mold base materials usually use HT200, HT250, and Q235, Q255 layout steels can also be selected. For the mold base of large-scale fine molds, cast steel ZG35 and ZG45 are used. (4) The parallelism of the upper and lower surfaces of the mold base should meet the requirements, and the parallelism is usually level 4. (5) The spacing between the guide sleeves and the guide post device holes of the upper and lower mold bases must be the same, and the accuracy is usually required to be below ±0.02mm; the axis of the guide post and guide sleeve device holes of the mold base should be aligned with the upper and lower mold bases The lower plane is straight. When the sliding guide post and guide sleeve are installed, the straightness is usually level 4. (6) The upper and lower surface roughness of the mold base is Ra1.6 ~ 0.8μm. Under the premise of ensuring the parallelism, it can be allowed to drop to Ra3.2 ~ 1.6μm. Backing plate: The function of the backing plate is to directly receive and disperse the pressure transmitted by the convex mold, so as to reduce the unit pressure of the mold base to avoid partial compression of the mold base. The shape of the backing plate is the same as that of the concave mold, and its fixing method Screws and pins are also used for fixing. All production equipment and testing equipment of Dongguan Precision Electronic Technology Co., Ltd. are imported from Taiwan and Japan. They mainly provide non-standard customization such as precision hardware, patch terminals, beryllium copper terminals, and stainless steel shrapnel processing. With many years of experience in the production of stamping and drawing parts, the main production of sheet drawing parts, special-shaped drawing parts, hardware drawing parts and other products are well received by customers. Various deep drawing products can be customized according to user specifications.