Mold Steel Defect Analysis And Treatment Methods - Die Steel, Molds - Metal Industry

Mold Production process, Mold Steel is often the emergence of various defects

, this paper defects common steel mold causes and solutions.

1, deformation Material deformation was partly due to manufacturers to reduce costs, the actual use of the mold material is not special mold steel, less rigid template, the thickness is not enough, causing the deformation.

Preventive measures: in the manufacture of complex precision molds, you should try to choose a smaller tool steel carbide segregation, do not plan cheaper, use less of small steel mills produce steel materials. The existence of severe segregation of carbon steel to make reasonable forging die to break the carbide crystal block, reducing the uneven distribution of carbide grades, elimination of anisotropy. on the forging die steel after quenching and tempering heat treatment to be carried out, and thus obtain carbide distribution, small and dispersed sorbite tissue, thereby reducing the sophisticated mold deformation after heat treatment. The large size of the mold or can not be forged, double-thinning treatment solution can be used to make carbide refining, distribution, rounded edges and corners, then it can achieve the purpose of deformation heat treatment to reduce mold.

Processing in addition to the corresponding address, the widening mode foot or die in central column withstand various points using afterburner. Requirements of certain mold itself is not high, the focus position can be instantly heated at high temperature deformation, to be effective. It is often worn away the edge of the template, it reduced the contact surface, to minimize the wear depth, in order to facilitate the effective life of the mold. After deformation of the cavity template angle scale is very difficult to correct the deviation, the cores made tight wall cavity is deformed, when the multi-cavity phenomenon is particularly serious, barely used, the template will not change the middle of the flash , in particular, good liquidity injection nylon and other products, should be re-polished with cores. When mold repair welding in thinner seat, the deformation is not to be ignored.

In addition, improper heat treatment and residual stress, stress and other reasons EDM mold can also cause swelling of the inconsistencies in the various parts to form the internal stress due to uneven heating. In the following phase transformation of steel temperature and produce uneven heating of the main heat stress, uneven heating over the phase transition temperature, will produce unequal nature of organizational change, both the stress generated. Therefore, the faster the heating, the mold surface and in the center of the larger temperature difference, the greater the stress, the mold heat treatment the greater the deformation.

Preventive measures: a complex mold heating phase transition point, the following should be heated slowly, in general, die vacuum heat treatment deformation is much smaller than the salt bath furnace Hardening. , With warm, low-alloy steel mold can be used for a warm (550-620 C); for high-alloy steel molds should be the second preheat (550-620 C and 800-850 C) . In addition to improving heat treatment, mold expert Luo Baihui proposal, design the mold, the actual production to meet the needs of the situation, should minimize the die thickness and the poor, structural asymmetry, border thickness in the mold, such as structural design with smoothing the transition. Deformation under the mold to set aside allowances, the deformation after quenching Buzhi Yu Er Shi mold scrapped because of mold. Particularly complex on the shape of the mold, in order to quench cooling even when, adopt a joint structure.

by: gaga

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