The technical requirements for cold die assembly are as follows:
(1) The assembled die shall have a closing height that meets the design requirements.
(2) After the mold shank (except the floating mold shank) is loaded into the upper mold base, the perpendicularity error of the axis line on the upper plane of the upper mold base is not more than 0.05 mm in the full length range.
(3) The matching clearance of the convex and concave molds should meet the technical requirements, and the contour along the entire cutting edge should be uniform.
(4) The positioning device should ensure correct and reliable positioning.
(5) The unloading and pushing device activities are flexible and correct, and the discharge holes are unobstructed, ensuring that the parts and scraps are not stuck in the die.
(6) The mold shall be tested under the conditions of production, and the parts that are punched out shall meet the design requirements.
The main points of the bending die: In general, the bending precision of the bending die is lower than that of the punching die, but the shape of the bending member changes when the material is bent after the forming. Since there are many factors affecting the rebound, it is difficult to calculate accurately. Therefore, when manufacturing a mold, it is often necessary to correct the shape of the convex and concave mold according to the rebound value at the time of the test. For the purpose of correction, the convex and concave molds of the bending die are heat-treated after passing the test. The size of the blank of some curved parts is determined after the test, so the adjustment of the bending is more complicated than the general punching mode.
Drawing mode: When drawing, since the material should slide on the surface of the mold, the working surface roughness of the deep and concave should be small, and the end should be smooth and rounded. Due to the complex deformation of the material during drawing, the drawn parts are not necessarily qualified, so the mold is often trimmed after the test. The trial installation and the trial operation must be arranged when drawing the mold. The blanking die is manufactured according to the size of the blank obtained from the test.
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