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我厂生产BJ212汽油机的缸体是采用ZL10铝合金铸件。加工高精度的孔是生产的关键,其中以缸体挺杆孔的加工问题最大,长期存在着孔壁划伤、光洁度差、孔径超差,仅半年的统计废品率占加工总数的5.5％。为了提高产品质量,保证生产均衡,我厂对缸体挺杆孔精加工刀具的结构、几何参数等方面进行了改进,经多年来的生产验证,现已定型并应用于生产,可使原来的废品率下降至0.2％以下(1980年5月统计)。实践证明,新研制的刀具对保证加工精度、提高光洁度及保证产品质量有明显的效果。现将精加工用单齿镗铰刀的研制及使用情况分述如下。
I plant production BJ212 gasoline engine block is the use of ZL10 aluminum alloy castings. Processing high-precision holes is the key to the production, of which the tappet hole cylinder processing the largest problems with long-term hole wall scratches, poor finish, aperture overbalance, accounting for only half of the statistical waste accounted for 5.5% of the total number of processing. In order to improve product quality, to ensure a balanced production, our factory on the cylinder tappet hole finishing tool structure, geometric parameters and other aspects of the improvement, after years of production verification, has been finalized and applied to the production, the original The rejection rate dropped below 0.2% (Statistics for May 1980). Practice has proved that the newly developed tool to ensure processing accuracy, improve finish and ensure product quality have significant results. Now the finishing single-tooth boring reamer development and use of the situation are described below.