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Failure analysis of die casting dies

Writer:高记Source:高记 Date:2016-07-21 15:11:49

Die casting die is a method of casting liquid die forging, which is completed on a special die casting die forging machine. The basic process is: the liquid metal first low speed or high speed casting filling into the mold cavity, mold cavity surface, it with liquid metal cooling process pressure forging, which eliminate the blank of shrinkage cavity and porosity defects, also make the blank internal organization achieve forging state of crushing grain. The main causes of the failure of the die casting dies are as follows:
First, the thermal fatigue crack damage failure
 

Die casting, mold repeated by chilling the heat shock effect, forming surface and its internal deformation, mutual and appear repeated cycles of thermal stress, lead to organizational structure damage and loss of toughness, lead to micro cracks appear, and continue to expand, once the crack expansion, squeeze and the molten metal, and repeated mechanical stress made crack accelerated expansion. To this end, on the one hand, die casting die must be fully pre heating. Also in the production process of high pressure die casting mold must be kept in a certain temperature range, in order to avoid the emergence of early crack failure. At the same time, to ensure that the mold before and during the manufacturing process is not a problem. Because of the actual production, most of the die failure is thermal fatigue crack failure.
Two, fragmentation failure
 

Under the action of ejection force, mold will in the weakest place crack initiation, especially on the molding surface of the mould crossed traces or electric machining trace is not polished, or is forming Qing corner will first appeared fine crack, when the grain boundary exists brittle phase or coarse grains, which is easy to be broken. Brittle fracture, crack propagation is very fast, which is a very dangerous factor to the failure of the mold. Therefore, on the one hand where mold surface scratch, electric processing traces must be polished, even if it in the pouring system part, must also be polishing. In addition, the high strength, good ductility, impact toughness and fracture toughness of the mould materials used are all good.
Three, corrosion failure
 

Conventional die casting alloy with zinc alloy, aluminum alloy, magnesium alloy and copper alloy, there are pure aluminum die casting, Zn, Al, Mg is the more active metal elements, they and mould material has good affinity, especially al easy bite die. When the hardness of the mold is higher, the corrosion resistance is better, while the forming surface if there is a soft point, the corrosion resistance is not good.

TypeInfo: Industry news

Keywords for the information:模胚 

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