Shanghai Daoqin Plastics Co., Ltd.

         cold mold as conditions relatively is complex and poor, mold in use process in 往往交织 multiple loss 伤, use process in, easy below/following 失效形式:

        1, fracture 失效

         fracture is mold in use in 突然出现 large cracks or loss 而失效. mold material tough degree and strong/high degree 不够, is generate fracture 失效两 large factors.

        2, abrasion loss 失效

         abrasion loss 失效时 mold as parts and by processing material between versus for generate loss consumption large 而失效. is anti abrasion loss 失效, using/adopting high alloy 钢, its carbon material dimensions large 偏析严 heavy 也常导致脆 property fracture.

        3, deformation 失效

         deformation 失效指 mold 发生永久 deformation, formed mold 失效. using/adopting property relatively good high carbon low alloy 钢, high carbon high alloy 钢. mold relatively large relatively thick 时, process 不当, can can deformation 失效.

        4, fatigue 失效

         fatigue 失效指 mold in 交变应 force function lower, cracks 不断生 formed, expand large, most 终失效.

         is improve/increase cold mold quality, 避免失效, production in using/adopting below/following measures:

        1, combined material selection

         fracture is 主, can selection tough property good material CrWMn钢, 9Mn2V钢, GD, CH钢 and other; abrasion loss is 主, can using/adopting Cr12, Cr12MoV, LD, GM钢 and other.

        2, hot 处理

        1) improve/increase high temperature add hot temperature degree can make carbon material fine solid solvent, high temperature can improvement carbon material and distribution, fine 化晶粒 increase processing parts property.

        2) is mold 失效, add hot process in separation grade add hot, shrink short high temperature time, cooling agent rear 旋转翻转 force cooling uniform, decrease small deformation and small cracks generate.

        3, combined 理锻造

         using/adopting 十字镦拔 method 锻造(轴 toward, toward 反复镦拔), can make high alloy mold rear carbon material grade small 于3 grade. meanwhile, control temperature degree, anti 止锻造 cracks generate;锻 rear commonly used hot 球化退火, 以利于 most hot 处理.

        4, 线切割 processing

         mold using/adopting more 次线切割 processing, most rear using/adopting small can amount decrease small 白亮层 thick degree and cracks deep degree. 线切割 processing rear using/adopting 200℃补充回火消 remove 线切割附 add force, can has improve/increase mold lifespan.