Introduction to powder pressing mold

Because the powder pressing method is many, the powder pressing mold is also various. According to different pressing methods can be divided into: pressing die, finishing die, repressing die, forging die and so on. The classification structure diagram and deformation characteristics of powder pressing die are listed in the table. The basic principle of powder metallurgy die design is: give full play to the process characteristics of powder metallurgy less, no cutting and nearly forming, to ensure that the billet reaches the geometric shape and size, precision and surface roughness, density and distribution of the three basic requirements, whether it is pressing die, finishing die, repressing die, forging die are required to do so. Among them, the density and distribution of pressing and forging billet is the main technical index in die design. Reasonably design the mold structure and choose the mold material, so that the mold parts have enough high strength, stiffness and hardness, high wear resistance and service life, in order to meet the high pressure working vessel safe, reliable and easy to operate requirements; At the same time, we should pay attention to the machinability and interchangeability of mold structure and mold parts, and reduce the cost of mold manufacturing. Its design steps and basic methods are as follows: first, understand and master the relevant design information, as an important basis for mold design; Secondly, according to the product requirements for material design and process design, according to the product drawings for billet design or preforming billet design, and select the press and pressing mode, design the mold structure sketch; Then on the basis of the size of the billet, taking into account the size changes in the process, respectively calculate the size of the main die parts, generally calculate the size directly related to the die cavity first, and then calculate the size of other die parts according to the mold assembly relationship; Z after drawing the mold assembly drawing and parts drawing, according to the different working requirements of various molds, mark the size deviation and shape tolerance, and select the mold material and technical requirements.

Computer aided design (CAD) and computer aided manufacturing (CAM) technology of die are developing trends. North America, Japan and European countries have vigorously promoted and applied CAD/CAM technology in the design and manufacture of powder pressing die. Mold CAD/CAM system can improve mold quality, reduce mold manufacturing hours, shorten the production cycle, so that mold design and manufacturing integration, can meet the user "high quality, fast delivery, low price" requirements.