Gear tooth clamping device and tooth surface residual stress measuring method

Abstract

The invention discloses a gear tooth clamping device. The device comprises a gear tooth alignment plate for aligning the position of a gear tooth; the gear tooth alignment plate is provided with a center line and at least two graduation lines perpendicular to the center line; and the gear tooth alignment plate is provided with a gear tooth fixing structure for fixing the gear tooth and a rotationdriving mechanism for driving the gear tooth fixing structure to rotate so as to adjust a measurement point on the tooth surface of a gear to make the measurement point located at a set position. Theinvention also discloses a tooth surface residual stress measuring method using the above gear tooth clamping device. With the gear tooth clamping device and tooth surface residual stress measuring method of the invention adopted, focusing can be performed quickly and conveniently; a camera light path or a focusing probe will not be blocked and interfered, any position of the tooth surface can bemeasured; a diffraction ring light path will not be blocked by other gear teeth, so that a measurement result is more stable; a position point satisfying a condition that kd<=R is selected as the measurement point, and therefore, measurement accuracy can be effectively improved; and, the gear tooth clamping device is adopted, so that a gear tooth alignment pose can be cut off quickly, and therefore, the accurate positioning of the measurement point can be realized.

Description

technical field [0001] The invention relates to a mechanical clamping mechanism, in particular to a gear tooth clamping device and a tooth surface residual stress measurement method. Background technique [0002] Residual stress is the self-equilibrium internal stress that remains in the object after eliminating the action of external force or uneven temperature field. Both machining and strengthening processes can cause residual stress, such as cold drawing, bending, cutting, rolling, shot peening, casting, forging, welding and metal heat treatment, etc., may cause residual stress due to uneven plastic deformation or phase transformation. Residual stress is generally harmful. For example, after improper heat treatment, welding or cutting of parts, residual stress will cause parts to warp or distort, or even crack, or cracks will appear on the surface after quenching and grinding. The existence of residual stress sometimes does not appear as a defect immediately, but when t...

AI Technical Summary

Problems solved by technology

[0008] 1) Gear interference cannot focus: There will be interference between other teeth of the gear and the residual stress meter, which will cause the residual stress meter to fail to measure in the correct position and posture;

[0009] 2) The optical path of the camera / focus probe is blocked: When the tooth surface area to be measured is located close to the root of the gear tooth, due to the geometry of the gear itself, the gear teeth next to the gear tooth under test will block the optical path of the camera, resulting in the camera being unable to be accurate Focusing, or preventing the focus probe from touching the surface of the workpiece, resulting in failure to focus;

[0010] 3) The optical path of the diffraction ring is blocked by other gear teeth, resulting in the loss of calculation data, unstable measurement results, or the rotation of the probe is hindered by gears, and data cannot be obtained;

[0011] 4) Due to the shape characteristics of the gear tooth profile, the measurement surface cannot be guaranteed to be a horizontal plane

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