Shorten the design cycle and improve the quality of the design is to shorten the mold development cycle one of the keys. And shorten the development cycle and prevent mold defects, is to improve the quality of mold manufacturing, reduce production costs the most effective prerequisite. We Yuzhuo Mold Factory for mold manufacturing process defects and preventive measures to make a summary.

1, forging processing
High carbon, high alloy steel, such as Cr12MoV, W18Cr4V, etc., are widely used in the manufacture of molds. However, the existence of such components in different degrees of steel segregation, carbide coarse uneven, non-uniform and other defects. Selection of high-carbon, high-alloy steel mold, must be a reasonable forging process to shape the module blank, so that the one hand, the steel module to achieve the size and size of rough, on the one hand can improve the organization and performance of steel. In addition, high-carbon, high alloy die steel poor thermal conductivity, heating rate can not be too fast, and heating should be uniform, in the forging temperature range, should be used forging than reasonable.
2, cutting
Mold cutting process should be strictly to ensure that the size of the round corner radius of the transition, arc and straight line should be smooth. If the mold of poor quality of cutting, mold damage may be caused in the following three aspects: 1) due to cutting inappropriate, resulting in a sharp corner or fillet radius is too small, will lead to mold in the work of severe stress concentration . 2) the surface is too rough after cutting, there may be knife marks, cracks, incisions and other defects, both as a stress concentration point, but also crack, fatigue crack or thermal fatigue crack initiation. 3) The cutting process did not completely and evenly remove the mold hair bad in the rolling or forging the decarburization layer, it is possible in the mold heat treatment produces uneven hardening layer, resulting in decreased wear resistance.
3, grinding
Mold in the fire, after tempering the general to be grinding to reduce the surface roughness value. As the grinding speed is too large, grinding wheel grain size is too small or poor cooling conditions and other factors, the mold surface caused by local overheating, resulting in local microstructure changes, or cause surface softening, hardness, or have a higher residual tensile stress And other phenomena, will reduce the service life of the mold Select the appropriate grinding process parameters to reduce local heating, grinding, under possible conditions to stress treatment, can effectively prevent the grinding cracks. To prevent grinding overheating and grinding cracks more measures, such as: the use of strong cutting force coarse grain wheel or poor adhesion of the grinding wheel to reduce the mold grinding feed; use the appropriate coolant; grinding 250 to 300 ℃ after the tempering to eliminate grinding stress.
4, EDM processing
Application of EDM die processing, the discharge area of the current density is large, resulting in a lot of heat, mold processing area temperature up to about 10000 ℃, due to high temperature, heat affected zone of microstructure will change, mold surface Due to high temperature and melting, and then quenching, and soon solidified to form a layer of re-solidification. Under the microscope can be seen, and then solidified layer was white bright color, there are more micro cracks inside. In order to extend the life of the mold can be used the following measures: EDM parameters adjustment Electrolytic or mechanical grinding method after grinding EDM surface, remove the abnormal layer of white bright layer, in particular, to remove micro-cracks. In the EDM after a low temperature tempering arrangements, the abnormal layer stability, to prevent micro-crack propagation.