1. Mold surface has soft spots
After heat treatment, surface mold soft spots, mold will affect the wear resistance and reduce die life.
1) die in the heat treatment before the surface oxide skin, pitting and local decarburization.
2) die quenching heating, cooling quenching medium the inappropriate choice of quenching impurities in the medium too much or aging.
(2) Preventive measures
1) The injection mold should be removed before heat treatment oxide skin, pitting, in the quenching adequate protection when heated mold surface, should maximize the use of a vacuum furnace, salt bath furnace and the protection of the atmosphere oven.
2) die quenching heated cooling, they should choose a suitable cooling medium, cooling medium to the long-term use should always be filtered, or periodic replacement. 2. Die poor organization before heat treatment
Mold the final ball of the organization coarse uneven, the ball of imperfect organization mesh, ribbon and chain carbon, which will die in quenched easy to crack, resulting in mold scrapped.
1) die steel materials, the original organizations, there are serious carbide segregation.
2) The forging process poor, such as forging heating temperature is too high, distortion is small, stop forging temperatures are high, and slow cooling rate after forging to forging the organization and a coarse mesh, ribbon, and chain-like carbon exists, so that the ball annealing it difficult to eliminate.
3) spheroidizing poor, such as the annealing temperature is too high or too low, such as temperature and shorter annealing time, annealing can cause the ball or the ball of the organization inequality bad.
(2) Preventive measures
1) The general conditions of work should be based on the mold, the production volume and material toughening its own performance, as we choose a good quality mold steel.
2) Improving the forging process or prepared using normalizing heat treatment, to eliminate the raw material in the mesh and chain carbide and carbide heterogeneity.
3) can not be forged high-carbon carbide segregation serious die steel can be refined solution heat treatment.
4) after the die forging billet formulate the correct spheroidizing specification, can be used quenched and tempered heat treatment and rapid absorption fine ball annealing work.
5) reasonable loading furnace to ensure that mold billet furnace temperature uniformity. 3. Mold produces quenching cracksFrom Website
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