(1) Since there is also a certain elastic deformation in the tensile deformation, the punching and trimming are performed before the convex and concave molds are hardened, and the convex and concave molds can be quenched after the qualified parts are punched out.
(2) The convex and concave molds with a circular cross section can be roughed on the lathe first, and then quenched by heat treatment, and then finished on the inner and outer cylindrical grinding machines. The rounded corners need to be ground and polished to meet the drawing requirements. The convex and concave molds with non-circular cross-section are firstly milled according to the scribe line, and then polished and polished. If the convex and concave molds are relatively large, a template is also prepared and processed according to the sample.
(3) The suitability of the rounded corners of the convex and concave molds is one of the key factors for the success of the tensile mold manufacturing. The rounded corners of the punch are determined by the workpiece and can be machined in place at the same time. The rounded corners of the die must have enough grinding allowance, and cannot be oversized at one time. Continue to test the mold to determine its final size. . The test mold is suitable. After quenching, it must be ground and polished.
(4) The gap between the convex and concave molds should be made uniform. For the tensioning mold without guide device, the same piece should be placed to adjust the correct installation position of the convex and concave molds; for the guided tensile mold, the gap between the convex and concave molds should be ensured evenly during assembly.
(5) The deformation of the drawing process is complicated, and it is difficult to accurately calculate the blank size. Generally, the drawing die is first manufactured, and after the test die is qualified, the blanking die is prepared according to the test mode.