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以前,我厂在加工尾座体上的尾座孔(图1)φ55H7时,是在安装锁紧块的φ35H7孔中装上工艺闷塞后加工出来的。这种加工方法存在着下列弊病:(1)由于需要工艺闷塞,浪费材料和加工时间。(2)因工艺闷塞与φ35H7孔是过渡配合,装拆时易于拉伤孔的表面。(3)φ35H7和尾座孔的孔距有加工误差,而锁紧块R27.5的圆弧又单独加工,装配后锁紧块与尾座芯是点或线接触,影响车床精度。为克服上述弊病,我们对原锁紧块进行了改进(图2),并利用改进后的锁紧块来加工尾座孔(加工时锁紧块的安装方式如图3)。实践证明:改进后的加工方法,既不需要工艺闷塞,又能保证φ35H7孔的
In the past, when processing the tailstock hole on the tailstock body (Fig. 1) φ55H7, I processed it in the φ35H7 hole where the locking block was installed. This method of processing has the following disadvantages: (1) waste of materials and processing time due to the need for stuffy stuffing. (2) bored because of the process and φ35H7 hole is a transition fit, easy to pull the surface of the hole when loading and unloading. (3) φ35H7 and tail hole hole pitch machining error, and the locking block R27.5 circular arc and processing alone, the assembly of the locking block and tailstock core is point or line contact, affecting the lathe accuracy. In order to overcome the above defects, we improved the original locking block (Figure 2) and used the improved locking block to process the tailstock hole (the locking block is installed as shown in Figure 3). Practice has proved that: improved processing methods, neither stuffy stuffy process, but also to ensure φ35H7 hole