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柴油机曲軸在工作时受有高度的循环应力,故軸頸的几何精度和光洁度要求均很高,光洁度一般在▽▽▽_8以上。要达到这样的光洁度,通常应采用曲軸磨床,但一般制造厂都缺少这种設备。我厂过去是采用精車后砂皮砂光,光洁度仅能保持▽▽▽_7。为此进行了滾軋工艺試驗,并取得初步成效,目前巳轉入正式生产,光洁度可稳定在▽▽▽_8～▽▽▽_9。它对一般不淬硬曲軸表面光洁度的提高,具有积极意义。
Diesel engine crankshaft at work by a high degree of cyclic stress, so journal geometry and finish requirements are high, finish generally ▽ ▽ ▽ _8 above. To achieve such a finish, crankshaft grinding machines are usually used, but the general lack of such equipment manufacturers. In the past, our factory adopted the sanding sand after the fine car, and the finish can only keep ▽ ▽ ▽ _7. For this reason, the rolling technology test has been carried out and the initial results have been achieved. At present, it has been put into formal production and the finish of the finish can be stabilized at ▽▽▽ _8 ~ ▽▽▽ _9. It is generally not hardened crankshaft surface finish, with a positive meaning.