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采用辗压扩孔工艺加工套圈锻件,常在套圈内表面出现麻坑与凸凹不平等缺陷。为消除上述缺陷,我们做了一系列试验,终于解决了上述问题。 众所周知,套圈锻件在辗制过程中(见图1),其温度将由90℃左右升至1000℃以上;此时,辗压辊的表面温度也将由室温升至500～600℃。这样,势必加快辗压辊表面的磨损与局部脱落,并与套圈内表面的氧化皮粘连,从而在套圈内表面出现麻坑与凸凹不平。
The use of rolling reaming process ferrule forgings, often appear in the inner surface of the loop pit and bump inequalities defects. In order to eliminate the above defects, we did a series of experiments and finally solved the above problems. As we all know, ferrule forging in the rolling process (see Figure 1), the temperature will rise from about 90 ℃ to 1000 ℃ above; at this time, the roller surface temperature will rise from room temperature to 500 ~ 600 ℃. In this way, it is bound to speed up the surface of the rolling roller wear and partial fall, and the inner surface of the ring oxide scale adhesion, which appears in the inner surface of the ferrule pit and uneven.