The processing of mold metal precision wire processing parts, a general guiding idea is to adapt to different materials, different shapes, different technical requirements, it has a certain plasticity, can achieve good processing through the control of processing effect.

According to the shape and shape of the parts, the parts can be divided into three categories: shafts, plates and shaped parts. The common process of metal finishing is roughly: roughing - heat treatment (quenching, quenching and tempering) - fine Grinding - electric machining - fitter (surface treatment) - assembly processing.

1 part heat treatment

The heat treatment process of the parts, while obtaining the required hardness of the parts, the metal line processing also needs to control the internal stress to ensure the dimensional stability of the parts during processing. Different materials have different treatment methods. With the development of the mold industry in recent years, the types of materials used have increased. In addition to Cr12, 40Cr, Cr12MoV, and hard alloys, some new materials, such as convex and concave molds, can be used. Such as V10, ASP23, etc., such materials have high thermal stability and good tissue state.

For the parts made of Cr12MoV, after quenching after rough machining, the workpiece has a large residual stress after quenching, which is easy to cause finishing or cracking during work. After quenching, the parts should be quenched and tempered to eliminate quenching. stress. The quenching temperature is controlled at 900-1020 ° C, then cooled to 200-220 ° C to be air-cooled, and then quickly returned to the furnace 220 ° C tempering, this method is called a hardening process, can obtain higher strength and wear resistance, for wear The mold is the main failure mode and works well. In the production, some workpieces with more corners and complicated shapes are encountered. The tempering is not enough to eliminate the quenching stress. Before the finishing, stress relief annealing or multiple aging treatment is needed to fully release the stress.

For powder alloy steel parts such as V10 and APS23, metal precision wire processing can withstand high temperature tempering. It can be quenched by secondary hardening process, quenched at 1050-1080 °C, and then tempered at 490-520 °C for many times. It can obtain high impact toughness and stability, and is suitable for molds with chipping as the main failure mode. Powder alloy steel has a high cost, but its performance is good, and it is forming a wide application trend.