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我厂生产的 MG1432A 砂轮架主轴是高精度镜面磨床的关键零件,原来采用气体氮化工艺,但由于处理中有时会产生弯曲变形及轴颈胀大等缺陷,引起了主轴表面硬度不均或偏低的现象。为进一步提高主轴的质量,我们采用离子氮化代替气体氮化工艺,对这种主轴进行系统的试验,取得了明显的效果。一、离子氮化工艺的探索1.氮化与温度的关系采用北京宣武电炉厂生产的 LD-100型离子氮化炉,工件材料均为38CrMoAlA 氮化钢。在装炉量相同,其它工艺参数不变的情况下,分别采用490、520、540、560、580℃,一段氮化处理,保温时间为10小时,试验结果如表1。从表中可看出,随着温度不断升高,氮化层表面硬度下降,当氮化温度达580℃时,硬度严重下降。氮化层深度随温度升高而加深,当
I produced MG1432A wheel spindle spindle is a key component of high-precision mirror grinder, the original gas nitriding process, but due to the processing sometimes produce bending deformation and journal expansion and other defects, causing the spindle surface hardness uneven or partial Low phenomenon. In order to further improve the quality of the main shaft, we use ion nitriding instead of gas nitriding process, and systematically test this kind of main shaft, which has achieved remarkable results. First, the exploration of the ion nitriding process 1. The relationship between nitriding and temperature LD-100 ion nitriding furnace produced by Beijing Xuanwu Electric Furnace Factory, the workpiece materials are 38CrMoAlA nitrided steel. In the same amount of loading furnace, the other process parameters remain unchanged, respectively, 490,520,540,560,580 ℃, a nitriding treatment, holding time of 10 hours, the test results in Table 1. As can be seen from the table, with the increasing temperature, the surface hardness of the nitride layer decreased, when the nitriding temperature reaches 580 ℃, the hardness decreased seriously. The depth of the nitride layer deepens as the temperature increases