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本文分析了一般工厂用合金钢制造柴油机高压油泵套筒的工艺问题，建议采用普通炭钢镀硬铬以代替使用高贵的合金钢，省去热处理工序并简化了精加工工序。 通过工艺过程的分析说明了新工艺方案的加工成本是可以减低的。 通过试制并进行了工件长期运转性能试验，证明新工艺方案是可行的镀铬套筒能够经久耐用。 建议在油泵偶件修复工作中采用套筒镀铬以代替一般的柱塞镀铬，因套筒是不运转的工件，所以可提高铭层硬度以增强耐磨性。 由于油泵套筒孔小而深（试件孔直径７公厘，长６６公厘，Ｄ／Ｌ＝１／９），本文着重说明了对小孔镀铬的试验研究。 油泵套筒小孔镀铭工艺方面初步得出如下结论。 １．油泵套筒镀铬采用Ｔ＝５５℃，ＤＫ＝６０安／公寸２的电镀用量可得较硬较光的烙层（硬度约达Ｈ３－１．０００，光度 ９）。 ２．尺寸精度可控制直径公差在 ０．０１ 公厘以内，锥度在０．００５公厘以内，椭圆度在 ０．００１ 公厘以内。 ３．采用图５ａ镀小孔的夹具，出气性较好，因之得出的铬层锥度及椭圆度均较小．
This paper analyzes the general factory manufacturing alloy steel high pressure pump sleeve process problems, proposed the use of ordinary carbon steel hard chrome instead of using noble alloy steel, eliminating the need for heat treatment process and simplify the finishing process. The analysis of the process shows that the processing cost of the new process can be reduced. Through trial production and long-term performance test of the workpiece, the new process scheme is proved to be viable chrome plated sleeve can be durable. It is suggested to use sleeve chrome instead of common plunger chrome in oil pump couple repair work. Because the sleeve is a non-working part, the hardness of the inscription layer can be increased to enhance the wear resistance. Because the pump sleeve bore is small and deep (specimen hole diameter 7 mm, length 66 mm, D / L = 1/9), this article highlights the experimental study of small holes chrome plating. Pump sleeve hole Ming plating process preliminary concluded as follows. 1. Oil pump sleeve chrome with T = 55 ℃, DK = 60A / inch 2 plating amount can be harder than the light of the brazing layer (hardness of about H3-1.000, luminosity 9). 2. Dimensional accuracy can control diameter tolerance within 0.01 mm, taper within 0.005 mm, ovality within 0.001 mm. 3. Figure 5a coated with a small hole fixture, outgassing is good, resulting in chromium layer taper and ovality are small.