Shanghai Daoqin Plastics Co., Ltd.

        1, hardness

         mold in as force is complex,如 hot as mold usually is in temperature degree lower 承受交变应 force function, therefore it tool has good resistant soft or property deformation can force, in long as ring lower still can maintain mold and dimensions degree. hardness is mold important property can 之一. for cold as mold hardness generally selection in 58HRC above,而 hot as mold especially is requirements high resistant hot fatigue property can mold, usually hardness in 45HRC left right. for use plastics mold, generally hardness requirements in 35HRC left right.

        2, strong/high degree and tough degree

         parts molding make mold 承受 巨 large impact, and other negative 荷, especially is high speed pressure, high speed precision and liquid formed and other technology and one-time formed technology development, mold more large negative 荷,往往 due to strong/high degree and tough degree 不够,造 molding 腔边缘 or local 塌陷, or fracture 而早期失效, therefore mold hot rear tool has relatively high hardness and tough degree.

        3, wear resistance

         parts formed 形时材 material and mold type surface versus for 运动, make type surface generate abrasion loss, from make mold dimensions degree, and surface coarse degree 发生变化而失效. abrasion loss is types complex process, effect/influence factors very more, remove 取决于 as used for mold outer conditions outer, also in very large degree upper 取决于 using/adopting chemical formed separation non-uniform property, 组织状态, force property can and other.

        4, fatigue property can

         mold as machine impact and hot impact 交变应 force, hot as mold in as process in, hot 交变应 force more obvious mold hot 裂. force and temperature degree degree effect/influence 而引起 cracks,往往 is in type surface formed shallow fine cracks, it speed and expand 展导致 mold 失效. another,钢 chemical formed separation and non-uniform,钢 in in defect non metal material, gas 孔, micro cracks and other 导致钢 fatigue strong/high degree reduce,因 is in 交变应 force function lower,首先 in this thin low generate fatigue cracks development is fatigue bad.

        5, viscous property

        工 mold parts surface due to metal versus expand dispersion or mono versus expand dispersion function,往往会 has by processing metal viscous 附, especially is 一 切削, 剪切工 tool and pressure tool surface generate viscous or phenomenon, this effect/influence 刃口 锋利程 degree and local 组织, chemical formed separation 改变, make 刃口部 separation or viscous metal 脱落划伤 mold, make parts surface coarse 糙. therefore good resistant viscous property is very important.

        6, light and property can

        随 mold, especially is plastics mold use, low surface coarse value (has 时甚至 is 镜面 程 degree) already separation necessary, low surface coarse degree value effect/influence to mold lifespan and production efficiency and products quality. high surface quality can decrease light 腐蚀(especially is local 点状腐蚀); decrease small cracking 危险,抛 light chemical formed separation, structure, hardness and carbon material distribution must uniform. large carbon material especially is it 们偏析并 formed belt/tape 状时, for surface light property is has 害. especially important is,钢 in can has has deformation large oxidation material or 偏析,因而必 must control and oxygen process. true electrical heavy 熔, electrical heavy 熔效果良 good, this type of process currently already formed is high grade plastics mold main/primary production methods. make is simple true gas has 助于消 remove large oxidation material 夹杂, this process not only can reduce oxidation material content, but also can make oxidation material more fine small, uniform, meanwhile control and oxygen process, also can 改变夹杂 material type type, make soft tool has relatively good tough property improve/increase light property can.