Cause analysis of die failure of low pressure casting

In the process of die-casting die, the most common way of invalidity is fracture invalidity, invalidity melting.

Three kinds of thermal fatigue crack damage damage three kinds of unsuccessful reasons are also introduced in detail.

1、 Invalid fracture

Under the effect of injection working pressure, the most sensitive area the cracks germinate in the production manufacturing mold of low-pressure aluminum castings, especially in the area the marks metal processing marks of the molding design line are carried out, the area the surface milling occurs will be the first tiny gap, the existence of ductile phase thick crystal at the grain boundary is easy to fracture. At the risk of rapid crack growth, ductile fracture, die fracture failure. Therefore, on the one hand, the surface scratches metal processing marks of the mold must be polished, even if it is in the pouring system software, it is also necessary to light the lamps. It is also specified that the compressive strength is high, the plastic deformation of excellent raw materials is good, the fracture toughness fracture ductility are very good.

2、 Invalid etching

Common mold zinc alloy materials, forged aluminum alloy, Hangzhou low-pressure casting factory aluminum alloy profiles, die-casting aluminum alloy copper, but also pure aluminum alloy die-casting, zinc rare elements, aluminum, magnesium is a cheerful, they have very good affinity, mold raw materials, very aluminum block. When the die has high strength excellent corrosion resistance, if the forming surface has soft spots, it is corrosion-resistant.

3、 Thermal fatigue crack damage is invalid

The manufacturing of die-casting die, the chilling effect of hot forming surface internal deformation again again, the welding stress of continuous circulation system appear mutually, resulting in the destruction of structure the lack of ductility, resulting in the appearance of microcracks, expanding again. When the cracks expand, the hydraulic diapir molten metal materials, the continuous mechanical equipment ground stress accelerate the crack growth. Therefore, on the one hand, the die-casting mold must be heated enough to start. In addition, in the whole process of die-casting mold, it is necessary to maintain a certain operating temperature range, in order to prevent the initial crack invalid Zhejiang low-pressure casting manufacturers. In addition, it is a problem to ensure that the mould is manufactured before it is built put into production for internal reasons. Because in the specific manufacturing, die invalidity is the most common failure of fatigue crack.