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我厂生产的操纵油阀为铸件(HT 28～48),其孔径为12毫米,孔长为87毫米,要求加工光洁度为8,锥度、不圆度及弯曲度均不许超超0.003毫米,孔与阀杆配合间隙为0.003～0.008毫米。旧加工工艺不仅生产效率低,而且质量差、废品率高达70%。经过长期摸索,试制成功了图1所示铰挤刀,生产实践证明,使用该刀加工阀孔效果较好。螺旋式铰挤刀沿刀刃长度方向有六种不同尺寸,在工作中起着不同的作用。头部28毫米为第一段,主要承受切削作用;第二段I 处为15毫米,
I plant the production of the control valve for the casting (HT 28 ~ 48), the aperture of 12 mm, hole length of 87 mm, required machining finish 8, taper, non-roundness and curvature are not super-0.003 mm, hole With the stem with the gap of 0.003 to 0.008 mm. The old process not only low production efficiency, but poor quality, rejection rate as high as 70%. After long-term exploration, the trial success of the hinge cutter shown in Figure 1, production practice has proved that the use of the knife processing valve hole better. Spiral hinge extrusion knife along the length of the blade has six different sizes, in the work plays a different role. Head 28 millimeters for the first paragraph, mainly to bear the cutting effect; the second paragraph I at 15 mm,