微机控制中频感应热处理的工艺试验研究

1 前言 通过微机控制,实现了中频感应淬火整个工艺过程的自动控制,并通过调节感应器上升速度来实现加热温度的闭环控制。本试验的目的就是要通过工艺研究和质量分析,制订正确的工艺程序和控制参数,为软件编制提供科学依据。试验研究对象是半轴和齿轮。     

提高大模数齿轮的淬火硬度

本文从作者所在企业现场条件出发，分析了大模数轮表面硬度低的原因，对工艺，工装，淬火油槽做了改进后进得了预期的效果。     

应用回归分析法制定连续炉淬火工艺

使用多年又几经改造和维修的连续淬火炉,其功率参数有很大变化,无法按原设计工艺进行生产。用回归分析法制定连续炉淬火工艺,不仅方便实用,淬火质量稳定,而且还能较理想地发挥专用炉的效率。     

模具钢淬火——回火温度选择的十种影响因素

模具钢淬火后得到M或M Ar、M K Ar^*1。淬火组织不稳定，不能直接使用。淬火钢必须进行回火，将钢加热至下临界温度(Acl)以下，保温后冷却下来，才能得到稳定的M回、T回、S回、P回^*2配等组织和所需要的物理机械力学性能。钢的组织决定钢的性能。     

Effects of rapid quenching on microstructures and electrochemical properties of La0.7Mg0.3Ni2.55Co0.45Bx（x=O-0.2） hydrogen storage alloy

In order to improve the electrochemical performances of La-Mg-Ni based electrode alloys with PuNi3-type structure, a trace of boron was added in La0.7Mg0.3Ni2.55Co0.45 alloy. The La0.7Mg0.3Ni2.55Co0.45Bx（a=0, 0.05, 0.1, 0.15 and 0.2） alloys were prepared by casting and rapid quenching. The electrochemical performances and microstructures of the as-cast and quenched alloys were investigated. The effects of rapid quenching on the microstructures and electrochemical performances of the above alloys were investigated. The results show that the as-cast and quenched alloys are composed of （La, Mg）Ni3 phase, LaNi5 phase and LaNi2 phase. A trace of the Ni2B phase exists in the as-cast alloys containing boron, and the Ni2B phase in the B-contained alloys nearly disappears after rapid quenching. Rapid quenching increases the amount of the LaNi2 phase in the B-free alloy, but it decreases the amount of the LaNi2 phase in the boron-containing alloys. The effects of rapid quenching on the capacities of the boron-containing and boron-free alloys are different. The capacity of the B-free alloy monotonously decreases with increasing quenching rate, whereas the capacities of the B-contained alloys have a maximum value with the change of the quenching rate. The rapid quenching can improve the stability of La-Mg-Ni based electrode alloy but lowers the discharge plateau voltage and decreases the plateau length. The effect of rapid quenching on the activation capabilities of the alloys was complicated.     

LKZT淬火油添加剂用于搓丝板硬化处理

曾对９ＳｉＣｒ钢搓丝板进行Ｎ１５机械油与好富顿Ｋ油淬火冷却效果的对比，又进行过Ｎ１５机械油中添加ＬＫＺＴ淬火油添加剂不同含量的淬火冷却效果的对比。两次试验对比的优胜者－好富顿Ｋ油和添加４％ＬＫＺＴ添加剂的Ｎ１５机械油在本次试验对比中，前者在淬火态试样表层显现略微优势，回火后则后者明显胜过前者。     

锥齿轮制造工艺的改进

针对ZJ30钻机重载锥齿轮使用寿命短的问题,探讨了锥齿轮早期疲劳破坏的原因和影响因素,综合分析认为,锥齿轮早期失效的主要原因是齿面硬化层深度不够。为此,从锥齿轮表面淬火工艺上开展试验研究,提出锥齿轮如下处理工艺:齿轮整体采用调质处理,心部硬度30～35HRC;齿面采用20～50kHz中频感应淬火处理,硬化层深度2.0～3.0mm。油田现场应用表明,采用上述改进工艺后,锥齿轮的使用寿命由原来的不足1000h延长至2000h以上。