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LT—110型汽车发动机缸体座瓦孔径为φ106.3mm,尺寸精度为H7,光洁度▽9。从第一道至第七道座瓦孔轴向位置尺寸公差不得超过0.021～0.35mm。缸体后端面与座瓦孔中心线的垂直度误差不应大于100:0.01,各孔同心度要求也较高。由于我厂无专用设备,为达到上述修理要求,我们特设计并制造了一套万向定心镗孔工具,利用这套工具于1982～1985年间在我厂T617卧式镗床上先后镗削修复了瑞典进口LT—110型汽车发动机缸体两个、日本进口D80A—12型寇明斯NH—
LT-110 car engine block seat bush diameter of φ106.3mm, dimensional accuracy of H7, finish ▽ 9. From the first to the seventh seat tile hole axial position size tolerance shall not exceed 0.021 ~ 0.35mm. The tolerance of the verticality between the rear end of the cylinder block and the centerline of the seat tile hole should not be greater than 100: 0.01, and the concentricity requirements of the holes are also higher. As I plant no special equipment, in order to achieve the above repair requirements, we specially designed and manufactured a set of universal centering boring tools, the use of this tool in 1982 to 1985 in my factory T617 horizontal boring machine has boring repair Sweden imported two LT-110 car engine block, Japan imported D80A-12 type Cummins NH-