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硬质合金的内孔加工比较困难。尤其加工小深孔就更困难了。我厂使用的冷镦顶模(图1)内孔小而深。使用电火花穿不透,椭圆度较大。现在使用特制的磨杆和砂轮,在普通内孔磨床上就可加工。这样解决了生产中多年没有解决的问题,使报废了的顶模经加工又可使用。每年可为国家节约五～六千元。磨杆的型式如图2所示。磨杆材料为45号钢,不能淬火,否则金刚石镀层不牢。磨杆左端镀金刚石,其粒度80～100~#;浓度50～100％;镀层厚度0.3毫米。
Carbide bore processing more difficult. In particular, the processing of small deep holes even more difficult. I plant the cold heading die (Figure 1) small and deep hole. The use of spark wear impermeable, ellipticity larger. Now using a special grinding rod and grinding wheel, can be processed in the ordinary bore grinder. This solved the problem of production for many years to solve, so that scrapped top mold can be used and processed. Each year for the country to save five to six thousand yuan. Grinding bar type shown in Figure 2. Grinding bar material for the 45 steel, can not quench, or diamond coating is not strong. Grinding the left end of the diamond-plated diamond, the particle size of 80 ~ 100 ~; concentration of 50 to 100%; coating thickness of 0.3 mm.