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我厂生产的6180型柴油机活塞销,采用20Cr钢制造,长期以来,为了保证产品质量,均采用传统的二次淬火法来生产,但使得热处理成本高,产品变形大。 近年来随着热处理淬火技术的发展和渗碳工艺的改进,我们对大型活塞销的热处理工艺进行了一次淬火的试验,取得了可喜的成绩。 一、6180活塞销渗碳工艺及对渗碳层组织要求 6180活塞销渗碳时CO_2值控制在0.25～0.35％毫米,这样使工件的表面含碳量就能比较精确地控制在0.94～1.05毫米范围内。经多炉次试验,其最高含碳量也未超过1.05毫米。 图1是6180活塞销渗碳工艺曲线图。 表1是剥层化验碳层含量分布,材料为20Cr,表内为CO_2％值。
The 6180 diesel engine piston pin produced by our factory is made of 20Cr steel. For a long time, the traditional secondary quenching method has been used to produce the products for a long time, but the heat treatment cost is high and the deformation of the products is large. In recent years, with the development of heat treatment quenching technology and the improvement of carburizing process, we conducted a quenching test on the heat treatment process of large piston pin and achieved gratifying results. First, the 6180 piston pin carburizing process and the organization requirements of carburized layer 6180 Piston pin carburizing CO_2 value controlled at 0.25 ~ 0.35% mm, so that the workpiece surface carbon content can be more accurately controlled at 0.94 ~ 1.05 mm Range. After many furnace test, the maximum carbon content did not exceed 1.05 mm. Figure 1 is 6180 piston pin carburizing process curve. Table 1 is the layer of carbon content of the peeling layer test, the material is 20Cr, the table is CO_2% value.