Processing method for groove of oscillating follower cylinder cam

Abstract

The invention relates to a method for processing the swing inactive cylinder cam groove, characterized in that the motion of swing inactive cylinder cam is divided into the arc swing along with the swing rod and the rotation relative to the cam, wherein, the arc swing can be decomposed into two mutually perpendicular straight motions in the swing plane as 3D motion, and the rotation relative to the cylinder cam is unfolded into the cylinder face that contacting the relation between the swing angle of swing rod and the rotation angle of cylinder cam as swing angle curvature onto the unfolded cylinder face, or projecting the relation between the displacement of swing inactive element and the rotation angle of cylinder cam as displacement curvature onto the unfolded cylinder face to obtain the 3D unfolded line; then based on the 3D unfolded line, processing the 3D blade track to be used in digit-control machine. The invention can avoid the error of general 2D unfolded method.

Description

technical field [0001] The invention belongs to the field of mechanical manufacturing, and relates to a processing method of mechanical parts, in particular to a processing method (including design and processing) of a cylindrical cam groove of a swing follower. Background technique [0002] Cylindrical cams are generally divided into two types: straight follower cylindrical cams and oscillating follower cylindrical cams. Many materials have analyzed and researched the design and processing of cylindrical cam grooves, such as [1] Xiao Yaoxian et al. Swing follower space cam CAM technology. Mechanical Science and Technology. 2002.5; [2] Gao Dongqiang et al. Using plane Practice of machining cylindrical cam with workpiece programming method. Journal of Shandong Institute of Light Industry. 2003.9; [3] Wei Sheng et al. Parametric design and numerical control machining of cylindrical cam. Precision manufacturing and automation. 2001.4; [4] Lu Jingui. Cam manufacturing technology...

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Problems solved by technology

[0005] (2) The error problem of the motion track; even after trimming, the follower can pass through the cam groove smoothly, but during the working process of the mechanism, since the swing follower deviates from the rotation axis of the cylindrical cam, it is not consistent with the designed motion. The track position deviates. When the machining of the cylindrical cam workpiece turns to a certain angle such as 50°, the tool also rotates through the angle relative to the cylindrical cam workpiece and moves to a certain position along the axis direction, and the cylindrical cam works to this position. (50°), because the swing of the follower 2 deviates from the rotation axis of the cylindrical cam (see Figure 2), the angle at which the follower rotates relative to the cylindrical cam is not equal to 50°, as shown in Figure 2, it is 56° , the position to which it moves in the axial direction is not the position to which the tool moves in the axial direction when the cylindrical cam workpiece is rotated to 50°, which will cause a difference between the designed follower movement trajectory and the actual follower movement trajectory large error between

Consult relevant literature such as [5] Liu Defu et al. Several key issues in NC machining of cylindrical cams. Mechanical Transmission. 2003.3; [6] Li Jian et al. Research on NC machining methods for conical cam profiles. .2005.12, etc.; but there is no practical technical solution

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