The advantages of deep drawing parts and mold hardness requirements

Deep-drawn stamping parts are mainly made of metal or non-metallic sheet materials by means of pressing presses. Compared with castings and forgings, deep-drawn stamping parts have the characteristics of thinness, uniformity, lightness and strength. Stamping can produce stamped parts with stiffeners, ribs, undulations or flanges that are difficult to manufacture by other methods to improve their rigidity. Due to the use of precision molds, the precision of deep-drawn stamping parts can reach the micron level, and the repeatability is high. With the improvement of the quality of stamping and drawing die products, the requirements for die quality and life are getting higher and higher. The effective way to improve the quality and life of molds is to develop and apply new mold materials and new heat and surface treatment techniques to continuously improve use performance and improve processing performance. Abrasion resistance is also an important performance index of deep drawing molds. When the part is formed, the metal and the surface of the mold cavity move relative to each other, which wears out the surface of the cavity, so that the size, shape, accuracy and surface roughness of the mold change and become invalid. The wear resistance of the mold is determined by the heat treatment of the mold, especially the surface heat treatment. The main basis for evaluating the wear resistance of the mold is the hardness. 1. For hardness <350HB, the smaller hardness of the small gear in the spur gear should be 20-25HB higher than the larger hardness of the conjugate large gear. For the helical or herringbone gear, the smaller hardness of the pinion should be higher The larger hardness of the yoke gear is as high as 40-50HB; 　　2, for the hardness>350HB, the hardness matching of the conjugate gear is the same as the processing of the drawing mold; 　　3, the soft and hard tooth surface matching, if the pinion gear adopts surface hardening Treatment, the big gear can be treated with nitriding, carburizing, etc., taking the steam turbine reducer as an example, the hardness of the driving gear shaft is 285320HB, and the hardness of the driven gear is 245285HB. Recommended article: Introduction to the drawing process of stamping parts Previous: How to make good inspections to make high-quality automobile stamping parts