Problems: The primary stress to which the surface of the mould is exposed are thermal shock, abrasion and chemical reactions between the liquid alloy and the iron in the steel mould. Certain regions of the mould are subjected to especially high stresses. In particular, these include ribs and the near-gate sections, where abrasion occurs owing to the high velocity of the molten alloy.
問題:壓鑄模具表面主要面臨的問題有熱沖擊雀鹃、磨損蜜硫、液態(tài)合金與模具鋼的化學反應等岂苏。某些地方還有高應力庞取,特別是成型筋的部位和澆口部位避顶,這些地方由于高速熔融合金流動易發(fā)生磨損。
Solutions 解決方案:
Materials selection: requires high temperature strength, toughness, hardness, and wear resistance.
鋼材選擇:需兼具高溫強度鞍靴,高韌度蟋软,高溫硬度和抗磨損;
Design: adopt small draft angle to reduce soldering, avoid sharp corner to reduce crack ,optimize runner system to reduce erosion.
模具設計:選用小的脫模角度減少粘焊嗽桩,避免尖角應力造成開裂岳守,優(yōu)化流道設計減少沖蝕。
Nitriding and oxidation: diffusion layer and oxidation layer improve soldering resistance, adhesion resistance and crack resistance.
氮化擴散層和氧化層:可以提高模具耐溶損性涤躲、耐過燒性棺耍、耐粘著性和耐熱裂性。
Maxit? Coating: Ensuring Max. service temperature of PVD hard layer exceeds the molten alloy.
Maxit?涂層:選用合適的涂層以避免高溫失效种樱。
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