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Hardware stretching partsProduction technology requirements:

The shape of the stretching part should be as simple and symmetrical as possible, and the stretching should be completed in one go as much as possible; On the premise of ensuring the necessary surface quality, the inner and outer surfaces of parts that require multiple drawing processes should allow for traces that may occur during drawing; On the premise of ensuring assembly requirements, the side walls of the tension part should allow for a certain slope; When annotating the dimensions of tension components, it should be indicated whether to ensure the external dimensions or internal dimensions, but internal dimensions cannot be guaranteed at the same time. For tension parts with steps, the height dimension should generally be based on the bottom.

If the above parts are used as benchmarks, it is not easy to guarantee the height dimensions; Coat the surface of the mold with a dry film lubricant (mainly composed of oil-based alkyd resin, plasticizers, extreme pressure agents, and other additives) to reduce the frictional resistance between the material and the mold surface during deformation, making it easier for the material to flow from the deformation zone to the force transmission zone. Integrating the last two processes (forming, stretching, and flanging) in the original process into one process (forming, flanging) will not increase the processing steps for that part, thus effectively controlling the processing cost. Reasonable convex mold fillet, reasonable heat treatment process, and lubricating coating on the mold surface can improve the success rate of stretching.

The key points for selecting metal stamping and drawing parts are as follows:

The parallelism of the upper and lower surfaces of the mold base should meet the requirements, and the parallelism is usually level 4.

2. The selected or planned mold base must be adapted to the relevant dimensions of the worktable and slider of the selected press, and necessary inspections must be conducted.

3. The mold seat material can be made of HT200, HT250, Q235, Q255 layout steel. Cast steel ZG35 and ZG45 are used for the die seat of large precision stamping dies.

4. The guide sleeve and guide column device of the upper and lower mold seats must have the same spacing, and the accuracy is usually required to be below 0.02 millimeters; The axis of the guide column and guide sleeve mounting hole of the mold frame should be in a straight line with the upper and lower planes of the mold frame. When installing sliding guide columns and guide sleeves, the straightness is usually level 4.

5. The mold seat selected or designed for stretching stamping parts must be compatible with the relevant dimensions of the selected press worktable and slider, and necessary inspections must be conducted. For example, the small profile size of the lower mold seat should be at least 40-50 mm larger than the size of the leakage hole on the press table.

6. Try to choose a standard mold frame, as the type and specifications of the standard mold frame determine the type and specifications of the upper and lower mold bases. If the mold base needs to be designed by oneself, the diameter of the circular mold base should be 30-70 mm larger than the concave template, and the length of the rectangular mold base should be 40-70 mm larger than the concave template. Its width can be slightly larger than or equal to the concave template. The thickness of the mold base can be determined by referring to the standard mold base, generally 1.0 to 1.5 times the thickness of the concave template, to ensure sufficient strength and rigidity.