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柴油发动机汽缸体曲轴孔和凸轮轴孔加工的传统工艺是采用细长镗杆镗削加工方法。由于细长镗杆的刚性差,所加工的孔一般同轴度差、轴线弯曲、孔径尺寸分散、光洁度低,因此这一工艺一直是发动机生产中的薄弱环节。而在现代高速发动机中,由于转速的提高,对汽缸体的精度要求也大大提高了。这样,传统的孔加工工艺就越来越不能适应不断提高的技术要求了。我厂过去生产6105Q型高速柴油机的汽缸体(见图1)时,是采用细长镗杆镗削工艺。由于铸件质量差,粗镗镗杆通不过孔,要先在T68型镗床上粗镗,然后再上专机进行半精镗和精镗。凸轮轴孔还要在压
The traditional process of crankshaft hole and camshaft hole machining of diesel engine cylinder block adopts the boring boring bar boring method. Due to the poor rigidity of the elongated boring bar, the hole is generally poor coaxial processing, bending axis, the aperture size and dispersion, low finish, so this process has been a weak link in the engine production. In the modern high-speed engine, due to the increase of speed, the accuracy of the cylinder body has also been greatly improved. In this way, the traditional hole processing technology more and more unable to meet the ever-increasing technical requirements. In the past, when the factory produced the cylinder block of 6105Q high-speed diesel engine (see Figure 1), it adopted the boring bar boring process. Due to the poor quality of castings, rough boring boring bar through the hole, first rough boring on the T68 boring machine, and then on the plane for semi-fine boring and fine boring. Camshaft hole but also pressure