挤压丝锥是通过挤入工件使金属产生塑性变形而加工出螺纹的丝锥。它不但适用于强度较低、塑性好的铜合金和铝合金,也可用于合金结构钢。而且可得到精度非常高的内螺纹。我厂生产的内燃机车连杆,是42CrMo调质材料,它的四个M24×2-1螺孔采用挤压丝锥加工比原来用普通丝锥加工,不但大大减轻了工人的劳动强度,而且节省了钳工;同时提高生产效率8倍左右,其光洁度和精度也提高了。 Extrusion tap is squeezed into the workpiece by plastic deformation of the metal and processed thread tap. It is not only suitable for low strength, good plasticity of copper alloys and aluminum alloys, but also for alloy structural steel. And can get a very high accuracy of the internal thread. The diesel locomotive connecting rod produced by our factory is 42CrMo quenched and tempered material. Its four M24 × 2-1 screw holes are processed by the extrusion tap instead of the ordinary tap, which not only greatly reduces the labor intensity but also saves Fitter; while improving production efficiency about 8 times, its finish and precision also increased.