塑料模具钢板使用特性      WSM718R(H)钢板力学性能，A：拉伸性能，舞阳钢铁 ，表略。B：冲击性能，表略。如需要来电咨询。精放电加工，应以小电流频率进行，放电厚模具表面应研磨...

塑料模具钢板使用特性
     WSM718R(H)钢板力学性能，A：拉伸性能，舞阳钢铁 ，表略。B：冲击性能，表略。如需要来电咨询。精放电加工，应以小电流频率进行，放电厚模具表面应研磨去除电火花白层，模具在500℃再回火一次以去除应力。机械加工性能，表略，塑料模具钢板使用特性 WSM718R(H)。
  补焊特性：应尽量避免模具的焊接，因焊接会增加模具破裂的危险性，若模具必须补焊，焊接前模具须预热，预热温度为：200℃-250℃。塑料模具钢板使用特性 WSM718R(H)

  热处理工艺：若提高材料和模具整体硬度或表面硬度，须经热处理进行改善，A:软化处理，在保护气氛中，加热至700℃均热后在炉中以每小时15℃的 速度冷却至600℃，然后空冷。B：消除应力处理，粗加工后，模具须加热至550℃，保温2个小时，炉冷至500℃后空冷。C：淬火处理，模具在淬火前，必须充分软性退货（温度在500℃-600℃），淬硬温度为860℃，模具在热透至奥氏体化温度后保温30分钟，在保护气氛下进行淬火，以避免脱碳及氧化层的产生。淬火介质为油淬火至300℃，停留最多4分钟后再空冷，冷却到50-70℃时，应立即回火。D:回火处理，选择合适的回火温度，回火温度时间为2小时。E:火焰及感应硬化处理，经火焰或感应硬化提高硬度50HRC，硬化后应空冷，小型模件可采用一般淬冷介质，硬化后应立即回火，回火温度为180-200℃。塑料模具钢板使用特性 WSM718R(H)
   表面硬化处理：模具硬化前应是退货状态，A：渗碳处理，温度850-940℃，时间与温度依表面碳化深度的要求而调整，若碳化温度及时间分别超过880℃和两个小时，模具应进行正火处理以获得细微的晶粒组织，并及时进行回火处理，硬度与回火工艺，表略。若碳化的温度比880℃低或不需要细微的晶粒组织与良好的机械特性时，模具经碳化后可直接硬化处理，碳化处理后，模具在炉中冷却到830℃，当整件模具达到同样温度时，须油冷，然后回火处理。塑料模具钢板使用特性 WSM718R(H)
   B:氮化处理，氮化增加模具表面硬度以加强耐磨损及抗侵蚀性能，525℃的氨气氮化后，模具的表面硬度约为650HV，钢板切割，表略。C：软氮化处理，与570℃两小时的软氮化处理，模具表面硬度约为700HV，氮化层厚度约为0.01毫米。D:硬铬(镀层）处理，模具经硬铬镀层处理后，应在180℃回火约4小时以避免氢脆作用。塑料模具钢板使用特性 WSM718R(H)
    研磨加工：正确的研磨技巧能避免研磨裂纹更能增进模具的寿命，低温回火的模具对研磨特别敏感，研磨砂轮必须适当的修整削锐，并尽可能选择较软，粘结度低，开发式晶粒的砂轮，限制最高圆周速度，并使用大量的冷却液。
    抛光处理：预硬钢板具有优良的抛光性能，通常采用氧化铝或石膏抛光，常用的顺序：研磨后预留0.05毫米-45号钻石膏抛光-15号钻石膏再抛光-3号钻石膏抛光，要求高的用一号钻石膏。每种钢材皆有最适当抛光时间，抛光时间的控制视钢材的硬度及抛光技巧，过长的抛光会影响模具的表面光洁度，例如：会产生橙皮纹等。
塑料模具钢板使用特性 WSM718R(H)
Use the characteristics of plastic mold steel
     WSM718R (H) steel mechanical properties, A: tensile properties, the table slightly. B: the impact of performance, table slightly. If you need to inquire. Precision EDM, should be small current frequency, the discharge should be ground to remove the mold surface of thick white layer of EDM, die once the fire back at 500 ℃ to remove the stress. Machining performance, the table a little, plastic mold steel with features WSM718R (H).
  Welding Characteristics: should try to avoid die soldering, welding will increase due to the risk of rupture of the mold, if the mold must welding, welding should die before preheating, preheating temperature: 200 ℃ -250 ℃. Plastic mold steel with features WSM718R (H)
  Heat Treatment: If the materials and molds to improve the overall stiffness or hardness of the surface improvements shall be subject to heat treatment, A: softening, in the protection of atmosphere, are heated to 700 ℃ in the oven heat to the cooling rate of 15 ℃ per hour to 600 ℃, and then air cooling. B: stress relief treatment, rough machining, the mold to be heated to 550 ℃, heat 2 hours, furnace cooling to 500 ℃, air cooling. C: quenching, quenching dies in front, must be fully flexible return (temperature at 500 ℃ -600 ℃), quenching temperature is 860 ℃, mold temperature and heat through to the austenite after the heat for 30 minutes, in the protection of the atmosphere under quenching, in order to avoid decarburization and oxide production. Quenching medium for quenching oil to 300 ℃, stay up to 4 minutes and then cooled, cooled to 50-70 ℃, immediately tempered. D: tempering, select the appropriate tempering temperature and tempering temperature for 2 hours. E: Flame and induction hardening by flame or induction hardening to improve the hardness 50HRC, after hardening should be air cooled, small modules can be generally quenching medium, tempered immediately after hardening, tempering temperature is 180-200 ℃. Plastic mold steel with features WSM718R (H)
   Surface hardening: hardening the mold should be returned before the state, A: carburizing treatment, temperature 850-940 ℃, time and temperature in accordance with the requirements of the surface to adjust the depth of carbonation, carbonization temperature and time if it were more than 880 ℃, and two hours Mold should be normalized to obtain the fine grain structure, and timely tempered, hardness and tempering process, the table slightly. If the carbonization temperature lower than 880 ℃ or no fine grain structure and good mechanical properties, the mold after hardening directly after carbonization, carbonization treatment, the mold in the furnace cooled to 830 ℃, when the whole die to reach the same temperature, the required oil cooling, and tempering. Plastic mold steel with features WSM718R (H)
   B: nitriding, nitriding increased the surface hardness of the mold to enhance resistance to abrasion and erosion resistance, 525 ℃ of ammonia nitrogen, the mold surface hardness of about 650HV, the table slightly. C: soft nitriding treatment, and 570 ℃ for two hours of the soft nitriding process, the mold surface hardness of about 700HV, nitride layer thickness of about 0.01 mm. D: hard chromium (coating) processing, mold by hard chromium plating treatment, should be tempered at 180 ℃ for about 4 hours to avoid hydrogen embrittlement effect. Plastic mold steel with features WSM718R (H)
    Grinding: Grinding the right skills to better enhance the crack to avoid grinding the life of the mold, the mold tempering particularly sensitive to the grinding, grinding wheel must be properly trimmed sharp cut, and much as possible to the soft, low bonding, development wheel-type grain, the maximum peripheral speed limit, and use a lot of coolant.
    Polished: Pre-hardened steel with excellent polishing performance, usually in polished aluminum or plaster, used in the order: reserve of 0.05 mm after grinding diamond paste polishing -15 -45 No. No. No. -3 diamond paste and then polished diamond paste polishing, One diamond with a high demand paste. Each polished steel Jieyou the most appropriate time, depending on the control of polishing time and polishing skills of the hardness of steel, the mold will affect the long polished surface finish, such as: will have cellulite and so on.
Plastic mold steel with features WSM718R (H)