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一、公制内螺纹,钻孔孔径的计算用理论方法计算公制内螺纹的孔径是:孔径=(公称直径-1.08×螺距)~(-内径公差)但在具体生产中属下列情况,一般用:孔径=公称直径-螺距:(1)用丝锥攻内螺纹;(2)加工3级精度的内螺纹;(3)加工螺距小于1毫米的内螺纹;(4)在低碳钢、铜、铝等等软材料上加工内螺纹,材料会胀,孔会挤小。在生产中属下列情况,一般用:孔径=公称直径-1.1×螺距:(1)用车刀切削内螺纹;(2)加工1级和2级精度的内螺纹;(3)在合金钢、生铁等等韧性、脆性、硬性
First, the metric internal thread, hole diameter calculation The theoretical method of calculating the internal diameter of the metric thread is: Aperture = (nominal diameter -1.08 × pitch) ~ (- diameter tolerance) But in the specific production of the following conditions, the general use: Aperture = Nominal diameter - Pitch: (1) Taps tapping internal thread; (2) Processing 3 precision internal thread; (3) Processing thread pitch less than 1 mm; (4) In the low carbon steel, copper, aluminum And so on the processing of internal thread soft material, the material will swell, the hole will squeeze small. In the production of the following conditions, the general use: Aperture = Nominal diameter -1.1 × Pitch: (1) cutting the internal thread with a turning tool; (2) the processing of internal thread of 1 and 2 precision; (3) in the alloy steel, Cast iron, etc. Toughness, brittle, hard