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1.来样情况来样系M7120A型卧轴矩台平面磨床砂轮主轴,材料为65Mn,经中频淬火处理,硬度要求HRC60以上。主轴主要工艺情况如下:原材料词质→车→中频淬火→160℃回火→粗磨→160℃时效→精磨→超精磨。在超精磨轴瓦档时,发现有一条白亮带,金工车间认为此白亮带属淬火缺陷。 2.宏观检验白亮带呈半圆环形,由带宽4毫米逐渐消失至呈尖尾状,见图1(图1照片系主轴已由线切割机割下)。表面硬度测定(用表面洛氏硬度计,载荷15公斤),白亮带区域RRC53,非白亮区域HRC61。在白亮带周围用3％硝酸酒精腐蚀,白亮带明显地不易被腐蚀,非白亮区较易被腐蚀,在白亮区与非白亮区交界处有一条明显的极易腐蚀的黑线。
1. Sample to the kind M7120A horizontal axis moment table grinding machine spindle, material 65Mn, IF quenching, hardness requirements HRC60 above. The main process of the spindle is as follows: The word → car → IF quenching → tempering → 160 ℃ tempered → 160 ℃ aging → → → fine grinding. In the ultra-fine grinding bush file, we found a white with bright, metalworking shop that this white with quenching defects. 2. Macroscopical examination The white band is semicircular and gradually disappears from a bandwidth of 4 mm to a pointed-tailed shape, as shown in Fig. 1 (the photograph of Fig. 1 has been cut off by a wire cutter). Surface hardness determination (surface Rockwell hardness tester, load 15 kg), white bright band area RRC53, non-white bright area HRC61. In the white belt around with 3% nitric acid alcohol corrosion, white with obvious obvious not easy to corrode, non-white areas are more easily corroded, white and bright white area at the junction of a clear extremely corrosive black line.