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一、前言 近年来,随着内燃机向增压、高功率的方向发展。对气门杆部的表面硬度,及耐磨性能提出了更高的要求。为此我厂在1986年应用了气门杆部离子氮化处理的新技术。 开始,我们应用这一技术时,质量很不稳定,每炉的变形量有60～85％超差,这样给产品质量带来了严重影响,为使气门经氮化处理后变形量不超差,我们经过一段时间的摸索和探讨,基本上控制了气门氮化后变形量。现将变形的主要原因初步分析如下: 1、气门氮化前预热处理工序和预热处理工艺规范选择不当。 2、气门在装炉前锥面对杆部的跳动量超差。 3、温度的均匀性
I. Introduction In recent years, with the internal combustion engine to boost pressure, high-power direction. On the valve stem surface hardness, and wear resistance put forward higher requirements. To this end I plant in 1986 the application of valve stem ion nitriding of new technologies. At first, when we applied this technique, the quality was very unstable. The deformation of each furnace was over 60% -85%, which seriously affected the quality of the products. In order to make the deformation of the valve not exceed the limit after nitriding , After a period of exploration and exploration, we basically control the amount of deformation of the valve after nitriding. Now the main reason for the deformation of the preliminary analysis is as follows: 1, the valve pre-nitriding preheating process and preheating process specifications improper selection. 2, the valve in the furnace before the taper cone on the pole of the beat beat. 3, the temperature uniformity