Making die-casting molds, Mr. Rong asked: How to reduce cracking of aluminum alloy die-casting molds? What kind of die steel is better to use? According to a lot of experience with
aluminum alloy die-casting molds, how can aluminum alloy die-casting molds reduce cracking? Use
Mold steel with high temperature resistance and high toughness, such as Yuhui LG mold steel, which has a long life without cracking!
The cracking of hot work die steel is due to the fact that when the die steel works at high temperature, after the die softens, the strength becomes lower, and the die steel with low thermal strength has poor erosion resistance, poor crack resistance, poor crack resistance and ductility. The thermal wear performance is also reduced, and finally the mold is eroded and cracked until the crack is scrapped.
aluminum alloy die-casting molds In addition, if the thermal conductivity of the mold steel is poor, the heat dissipation of the mold is slow, and the thermal expansion and contraction variables of the mold during the rapid cooling and heating process are large, which will lead to more severe cracks. .
Therefore, in order to enhance the anti-cracking performance of hot work die steel, the die steel must have the characteristics of "four highs", high heat resistance, high hardness, high toughness, and high thermal conductivity. Generally speaking, that is, the heat-resistant alloy molybdenum Mo content of the die steel is high, and the heat-treated die steel has more molybdenum carbide structures, so that the high temperature softening resistance of the die steel is good; the hardness should be high, preferably above HRC50; toughness Well, the mold won't crack; the mold will dissipate heat faster.
Looking at the hot work die steel models, perhaps only LG die steel has these "four high" characteristics;
1) The molybdenum content of the heat-resistant alloy of LG mold steel is the same as that of 8418 mold steel, and the mold has good softening resistance at high temperature;
2) The hardness of LG die steel is HRC54-58, and the die strength is sufficient;
3) The toughness of LG die steel is 8~9 times that of DC53. LG has such high toughness under high hardness HRC54-58, which is a feature that other hot work die steels do not have;
4) The thermal conductivity of LG die steel is high, the heat dissipation of the die is fast, and the variable of thermal expansion and contraction is small under extremely cold and hot working conditions, and the die is not easy to be eroded, cracked or cracked;
Mr. ksj