Shanghai Daoqin Plastics Co., Ltd.

         一, 淬裂

        淬裂 causes and anti measures lower:

        1, 形状效应, main/primary is design factors formed, 如圆角R small, 孔穴位置设置不当, 截面 渡不 good.

        2, hot (烧), main/primary is temperature or temperature, process temperature degree high, temperature and other factors formed, anti measures 包括检修, for temperature system, positive process temperature degree, in parts and sheet/plate add iron and other.

        3, carbon, main/primary hot (or 烧), gas 炉无保护 add hot, machine add amount small, or hot 处理残留脱 carbon and other factors formed, anti measures is can gas add hot, salt add hot, true 空炉, 箱式炉 using/adopting 装箱保护 or use anti oxidation coating material; machine processing amount add large 2～3mm.

        4, cooling 不当, main/primary is cooling agent selection or cold formed, 应当掌握淬火介质 cooling features or 回火处理.

        5, Raw Materials defect, carbon material 偏析严 heavy, quality 差, hot methods and other, anti measures is using/adopting positive 确 锻造 process and combined 理 预备 hot made degree.

        二, hardness 不足

         hardness causes and anti measures lower:

        1, temperature degree low, main/primary is due to process temperature degree 不当, temperature system 误差, or cooling methods and other causes formed, 应该修 positive process temperature degree, 检修校核控 temperature system, 装炉时, parts combined 理摆放 uniform, dispersion 入槽, prohibited or formed 捆入槽 cooling.

        2, temperature degree high, this is process temperature degree or temperature system 误差造 formed, 应当修 positive process temperature degree, 检修校核控 temperature system.

        3, 回火, this is 由回火 temperature degree high, temperature system fault/failure or temperature high 时入炉造 formed, 应当修 positive process temperature degree, 检修校核控 temperature system, high 于设置炉 temperature 装入.

        4, cooling 不当, causes is cold time long, cooling selection 不当, 淬火介质 temperature degree high cooling property can decline, defect or temperature degree high and other, measures: 出炉, and other need fast;掌握淬火介质 cooling features;油 temperature 60～80℃, water temperature 30℃ below/following, 当淬火 amount large make cooling rise temperature 时, add cooling 淬火介质 or use its it cooling cooling; add strong/high cooling agent 搅拌; in Ms+50℃时取出.

        5, carbon, this is Raw Materials 残留脱 carbon or add hot formed, anti measures is can gas add hot, salt add hot, true 空炉, 箱式炉 using/adopting 装箱保护 or use anti oxidation coating material; machine processing amount add large 2～3mm.

        三, deformation ultra- 差

         in machine manufacturing in, hot 处理 淬火 deformation is for, deformation is versus for. 换句话说, is deformation large small issues. this main/primary is due to hot process in 马氏体 versus tool has surface 浮凸效应. anti hot deformation (dimensions and 形状变化) is non difficult as, in many lower, 不 不依靠 experience add solution. this is is not only types and mold for hot deformation has effect/influence, carbon material distribution and and hot methods 同样会引起 or add 剧, but also in hot 处理诸 more conditions in, need certain conditions 发生变化, parts deformation degree has very large 变化.

        尽 tube/pipe in versus long time also main/primary experience and method solution hot deformation issues, positive 确掌握 Raw Materials 锻造, block orientation, mold 形状, hot methods and hot deformation 关系, from already 经积累 实际 data in hot deformation 规律, has hot deformation 档案资 material, is 一项极 has 意义 工 as.

        四, carbon

        脱 carbon is due to parts in add hot or temperature 时, 因周围 gas function, make surface separation carbon full or separation phenomenon and reaction. parts carbon not only formed hardness 不足, and hot deformation and chemical hot defect, but also for fatigue strong/high degree, wear resistance and mold property can has very large effect/influence.

        五, electrical processing cracks

         in mold manufacturing in, using/adopting electrical processing (electrical and 线切割) is 越 越普遍 using/adopting processing methods, 但随 放 electrical processing application, its defect versus increase more. due to electrical processing is 借助于放 electrical generate high temperature make mold surface processing methods, therefore, in its processing surface formed white electrical processing 变质层, generate 800MPa left right force, this 样, in mold electrical processing process in 常出现 deformation or cracks and other defect.

         therefore, using/adopting electrical processing mold, must separation 掌握放 electrical processing for mold material effect/influence, 并预先采取 versus 应 预 anti measures. anti hot 处理时 hot and carbon, 并进行充 separation 回火以 reduce or remove 残留应 force; is separation remove 淬火时 generate internal stress, need high temperature 回火, therefore using/adopting can high temperature 回火 钢 types (如Crl2 type, ASP一23, high speed and other), stability electrical conditions processing;放 electrical processing rear, as stability 化松驰处理;设置 combined process 孔, 槽;充 separation remove again solid 层, in full lower use; utilizing amount principle, for front already in separation internal stress 傲切通引流 dispersion 释放.

        六, tough property 不足

         tough property causes can can is temperature degree high, temperature time long 引起晶粒 coarse formed, or due to has 避开回火脆 property 区进行回火.

        七, abrasion cracks

        当工 parts inner has a large amount of 残留奥氏体时, in abrasion hot function lower, 发生回火转变, from generate 组织应 force, 导致工 parts cracking. its anti measures is: rear deep cold or more heavy 复回火(mold generally is 2～3次, make is cold processing use low alloy tool is 如此), most large degree reduce 残留奥氏体 amount.