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一、概况在一般的淬火情况下,热锻模的损坏有如下三种情况: 第一种是整个模具打几锤就全部开裂。这可采用提高它的回火温度、降低硬度、提高韧性的方法来解决。第二种是模具使用一段时间后,模棱塌陷位移。这可经过退火、重新淬火后,降低模具的回火温度、提高硬度;在使用中加强模腔冷却,严禁打“红腔”,使模腔不要超过其回火温度。这样可延长其使用寿命。第三种是模具使用较长时间后,模腔棱边磨损“节裂”。热锻模基本上都是以模面上模棱的磨损“节裂”而报废。如果对模具进行渗碳或碳氮共渗,油淬等温冷却、正常回火处理,模具的渗层深度为0.5～0.8mm,表面硬度提高(约为R_c50左右),这样可提高热
First, an overview In the general case of quenching, hot forging damage the following three conditions: The first is the entire mold to fight a few hammer on all cracking. This can be used to improve its tempering temperature, reduce hardness, improve the toughness of the method to solve. The second is the use of mold after a period of time, moderation collapse displacement. This can be annealed, re-quenching, reducing the tempering temperature of the mold to increase the hardness; in use to strengthen the cavity cooling, non-playing “red cavity” so that the cavity should not exceed the tempering temperature. This will extend its useful life. The third is the use of mold after a long time, the cavity edge wear “crack.” Hot forging die are basically modeled on the edge of the wear and tear “crack” and scrapped. If the mold carburizing or carbonitriding, oil quenching isothermal cooling, the normal tempering, the infiltration layer depth of 0.5 ~ 0.8mm, the surface hardness increased (about R_c50 or so), which can increase the heat