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感应加热淬火技术的优点与不足

感应加热表面淬火技术不仅有效地改善金属的表面性能(如硬度、耐磨性、抗腐蚀性、导热、导电性能等),与其他常用的表面处理工艺(如渗碳、调质、表面渗氮等)相比,还具有以下优点:
(1)加热速度极快,可扩大A体转变温度范围,缩短转变时间。   
(2)淬火后工件表层可得到极细的隐晶马氏体,硬度稍高(2~3HRC)。脆性较低及较高疲劳强度。   
(3)经该工艺处理的工件不易氧化脱碳,甚至  有些工件处理后可直接装配使用。
(4)淬硬层深,易于控制操作,易于实现机械化,自动化。                              
(5)可进行工件局部淬火
该技术能精确地将工件需要进行淬火的局部进行加热,特别是在采用导磁体和使用高功率密度的情况下。
(3)节能热处理
其能耗与渗碳、氮化、调质相比具有极大的优势,当工件淬火部位质量与整体质量之差越大时,它的优势也越显著。感应热处理常具有高的附加值。
(4)快速热处理
感应淬火的加热时间以妙计,一般在2~14s之内,生产周期亦短,特别是在采用自回火或随机感应回火情况下,此工序与机加工工序相似。为此,现代化的感应加热淬火装备已经安排在生产线或自动线上。
(5)清洁热处理
感应淬火所用淬火液一般为水或具有添加剂的水溶液,淬火时,几乎没有油烟,劳动环境好。
(6)便于机械化及自动化
大批量生产的感应淬火,一般均配有进步梁送料、机械手取工件及机器人操纵感应器等减少体力劳动的装置。
然而,感应加热表面淬火也有其本身的不足:
(7)工具费用高
需要专用工装即感应器热处理炉一炉可装多种工件加热、渗碳、氮化,而感应淬火则要求一个部位一种感应器,甚至要求一种专用定位夹具等,因此工具费用高。它只适用于大批量生产一种或一种族的工件。
(8)成套装置投资费用高
和一般热处理设备相比,感应加热成套装置包括变频电源、淬火机床、感应器,以及附属的冷却水、淬水液循环装置等,其投资费用相对较高,维护技术及费用亦比一般热处理设备高[2]。
感应加热淬火工艺概述
轴承磙子加工工艺

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