Processing method of bidirectional eccentric shaft

Abstract

The invention provides a processing method of a bidirectional eccentric shaft. The processing method can be used for ensuring that the eccentric directions of two eccentric excircles are reverse at an angle of 180 degrees along a central axis and ensuring the processing quality. The method comprises the following steps of: lathing a part blank, namely lathing the excircle of a central shaft which takes A as reference to meet the requirements of a drawing, and respectively reserving 2-3mm processing allowance for the excircles of a first eccentric shaft and a second eccentric shaft which take A1 and A2 as reference; and then sequentially finishing the excircles of the first eccentric shaft and the second eccentric shaft to meet the requirements of the drawing. The processing method is characterized in that during the process of finishing the excircle of the first eccentric shaft which takes A1 as reference, a first cushion block is padded on the excircle of the central shaft firstly, and then the first cushion block is clamped by a three-jaw chuck, thereby ensuring that the axes of a turning lathe main shaft and the first eccentric shaft are coincided; and during the process of finishing the excircle of the second eccentric shaft which takes A2 as reference, a second cushion block is padded on the excircle of the first eccentric shaft which is well finished, and then the second cushion block is clamped by the three-jaw chuck, thereby ensuring that the axes of the turning lathe main shaft and the second eccentric shaft are coincided.

Description

technical field [0001] The invention relates to the technical field of outer circle processing of axial parts, in particular to the field of outer circle processing of eccentric axial parts, in particular to a method for processing bidirectional eccentric shafts. Background technique [0002] A bidirectional eccentric shaft, see figure 1 , which includes a central axis 3 based on A, a 1 referenced to the first eccentric axis 1 and to A 2 Based on the second eccentric shaft 2, the first eccentric shaft 1 and the second eccentric shaft 2 are respectively located at both ends of the central shaft 3, and the axis eccentricity moment of the axis of the first eccentric shaft 1 and the second eccentric shaft 2 relative to the central shaft 3 respectively e 1 and e 2 , and the eccentric directions of the first eccentric shaft 1 and the second eccentric shaft 2 are opposite along the axis of the central shaft 3 by 180° and are located in the same plane. The traditional method of ...

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Problems solved by technology

[0002] A bidirectional eccentric shaft, see figure 1 , which includes a central axis 3 based on A, a 1 referenced to the first eccentric axis 1 and to A 2 Based on the second eccentric shaft 2, the first eccentric shaft 1 and the second eccentric shaft 2 are respectively located at both ends of the central shaft 3, and the axis eccentricity moment of the axis of the first eccentric shaft 1 and the second eccentric shaft 2 relative to the central shaft 3 respectively e 1 and e 2 , and the eccentric directions of the first eccentric shaft 1 and the second eccentric shaft 2 are opposite along the axis of the central shaft 3 by 180° and are located in the same plane. The traditional method of processing such bidirectional eccentric shafts mostly uses a four-jaw chuck to directly clamp the parts Carry out turning of eccentric outer circles on both sides successively. The disadvantage is that after the eccentric outer circle on one side is processed, the axis of the other eccentric outer circle cannot be accurately found, so it is impossible to ensure that the two eccentric outer circles are 180° opposite along the central axis; Traditionally, a three-jaw chuck and pads are used to process two eccentric outer circles. The first eccentric is processed first, and the pad is placed on one jaw of the three-jaw chuck to clamp the central axis 3, and then two Busbar correction, and then correction of the circumference, the second eccentricity is generally processed in the same way as the first eccentricity, and the second eccentricity cannot be guaranteed to be 180° opposite to the first eccentricity direction, so the symmetrical two-way eccentricity processed Shaft does not meet drawing requirements

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