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为了进一步提高气门杆部的表面硬度及耐磨性能,我厂于1986年采用了离子氮化新技术。在开始应用这种新技术时,质量很不稳定,每炉变形超差的有60～85％。经过一段时间的摸索,找出了变形原因并采取了防止措施,达到了预期的效果。一、变形的主要原因1.气门氮化前预热处理工序和工艺规范选择不当。2.气门在装炉前锥面对杆部的跳动量超差。3.温度的均匀性差。(1)阴阳极距离:由于炉子以内壁作阳极,以工件作阴极,气门表面
In order to further improve the valve stem surface hardness and wear resistance, I plant in 1986 using a new technology of ion nitriding. At the beginning of the application of this new technology, the quality is very unstable, with over-tolerance of 60 to 85% per furnace. After a period of exploration, find out the causes of deformation and take preventive measures to achieve the desired results. First, the main reason for deformation 1. Valve pre-nitriding pre-treatment process and process specifications improper selection. 2. Valve in the furnace before the taper cone on the amount of beating overshoot. 3. The temperature uniformity is poor. (1) Yin and Yang distance: As the furnace to the inner wall for the anode, the workpiece for the cathode, the valve surface