A method of eccentricity of a part with a three-jaw centering chuck, which is a form of self-centering. This method can also be processed on lathes, milling machines, and trampolines. When the installation is applied with external force, the surface of the 5D1 is close to the two cylindrical pins, which belongs to the outer circle. It is pressed by the end face and can be used for machining on lathes, boring machines and milling machines. At this time, the arcs of the holes 5D2 and R1 are simultaneously processed, and the positioning error is equal to zero for R1. The first few are external circle positioning, the vacuum core hole 5D2 is positioned to process the outer circle 5D1, and the spring sleeve is used to eliminate the gap to ensure the center is unchanged. It can be processed on lathes and grinders, and the error of R1 and R2 is affected by the outer circle of the part itself. Insert the positioning pin on the turntable and the retaining plate, and press the turntable on the retaining plate. After machining the small hole 5D2 (or the large hole 5D1), pull out the positioning pin, loosen the screw, turn the turntable 180°, and then insert it. Locating pin, compacting the turntable (the position of 5D2 is indicated by the dotted line), and reworking the large circle 5D1 (or small hole 5D2), the eccentricity is equal to e/2. It can be processed on the lathe, milling machine 1. turntable 2. . Since it is equivalent to reinstalling a workpiece, positioning is clearly equivalent to pin positioning. The positioning error is determined by the two positioning errors of the retaining disk and the turntable. In order to minimize the positioning error of the positioning pin, the seat of the turntable and the retaining plate is made precise to ensure that the e/2 change is as small as possible.
Fine analysis, R1 error is very large, however, this tooling is generally used for the processing of the rotary vane integral pump casing, the requirements for R1 are not strict, and the requirements for R2 are strict. It is not affected by 5D1, and it should be consciously made that e/2 is controlled to be inferior, so as to ensure that 5D1 and 5D2 will not be tangential or tangential to ensure the sealing performance of the pump. h. At this time, the error of R2 is determined by the e and 5D4 of the tooling (do not consider the accuracy of the model itself), the shaping mode is shaped, and finally the actual error of the shaping mode is determined. The shaping die mainly solves the problem of clearing angles at the intersection of two arcs. Although the sealing gap of these parts is pressed into the pump casing, the sealing clearance is guaranteed by R2, but the 5D1, 5D4 and E of the parts have influence on the matching seat pressed into the pump casing. Therefore, we must pay attention to several sizes.
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