Selection and design standards of hardware precision drawing stamping parts

For the manufacture of precision drawing stamping parts, standard mold bases are used as much as possible, and the type and specifications of standard mold bases determine the types and specifications of upper and lower mold bases.

(1) Generally, HT200 and HT250 are used as mold base materials, and Q235 and Q255 structural steels can also be used. For mold bases of large precision molds, cast steel ZG35 and ZG45 are used.

(2) The parallelism of the upper and lower surfaces of the mold base should meet the requirements, and the parallelism tolerance is generally level 4.

(3) The upper and lower surface roughness of the mold base is Ra1.6 ~ 0.8μm. Under the premise of ensuring parallelism, it can be allowed to be reduced to Ra3.2 ~ 1.6μm. Backing plate: The function of the backing plate is to directly bear and diffuse the pressure transmitted by the convex mold to reduce the unit pressure of the mold base and prevent the mold base from being locally compressed. The shape of the backing plate is the same as that of the concave mold. Screws and pins are also used for fixing.

(4) The center distance of the guide bushes and guide post mounting holes of the upper and lower mold bases must be the same, and the accuracy is generally required to be below ±0.02mm; the axis of the guide posts and guide bush mounting holes of the mold base should be the same The upper and lower planes are vertical. When sliding guide posts and guide sleeves are installed, the perpendicularity tolerance is generally level 4.

(5) The mold base selected or designed for the precision drawing stamping parts must be compatible with the relevant dimensions of the worktable and slider of the selected press, and must be checked. For example, the minimum outline 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 table.

(6) If you need to design 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 for precision drawing stamping parts can be determined with reference to the standard mold base, generally 1.0 to 1.5 times the thickness of the concave template to ensure sufficient strength and rigidity. For large non-standard mold bases, it must be designed according to actual needs, according to casting process requirements and casting structure design specifications.

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