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Surface treatment process and method for bearing workpieces
2025-03-24
There are straight waveform marks on the surface of the bearing workpiece
We will take a cross-section of the vertical axis of the ground workpiece and enlarge it, and we can see that its periphery is approximately a sine wave. When the center of the sine wave moves along the axis without rotation or translation, the trajectory around the sine wave becomes a cylindrical waveform, also known as a polygon. The reason for generating a straight waveform is the movement of the grinding wheel relative to the workpiece or the periodic variation of the pressure exerted by the grinding wheel on the workpiece, which causes vibration. This type of vibration may be forced or self-excited, so there are often more than one direct wave frequency on the workpiece.
The specific reason for the generation of bearing straight waveform marks is:
1. The clearance between the grinding wheel spindle is too large;
2. The hardness of the grinding wheel is too high;
3. Poor static balance of the grinding wheel or dull grinding wheel;
4. The workpiece speed is too high;
5. The horizontal blade is too large;
6. The bearing of the grinding wheel spindle is worn, and the clearance is too large, resulting in radial runout;
7. Grinding wheel clamping mechanism or worktable crawling, etc.
Recreating burn marks on the surface of the workpiece
The surface of the workpiece is often burned during the grinding process, and there are several types of burns. Firstly, the burn appears as dark black patches along the direction of the grinding wheel; The second is in the form of lines or intermittent lines.
The surface of the workpiece is burned during the grinding process, which can be summarized into the following reasons:
1. The grinding wheel is too hard or the grain size is too fine, and the structure is too dense;
2. Excessive feed rate, insufficient supply of cutting fluid, and poor heat dissipation conditions;
3. The workpiece speed is too low and the grinding wheel speed is too fast;
4. Excessive vibration of the grinding wheel can cause burns due to continuous changes in grinding depth;
5. The grinding wheel is not adjusted in a timely manner or is not properly adjusted;
6. The diamond is sharp and the grinding wheel is not well trimmed;
7. The workpiece was burned too deeply during rough grinding, and the amount left for fine grinding was too small, resulting in no wear off;
8. Insufficient clamping force or suction force on the workpiece, resulting in the workpiece stopping under the action of grinding force.
So how do we know if the surface of the workpiece is burnt during the grinding process? This can be detected through regular acid washing. After pickling the workpiece, when the surface is wet, it should be visually inspected immediately under a diffuse light, and the normal surface should appear uniformly dark gray. If it is a software point, it presents cloud like dark black spots, and the perimeter is not fixed; If decarburization occurs, gray white or dark black spots will appear; If cracks are generated during grinding, they will appear as cracks. If burned, there will be dark spots on the surface along the direction of the grinding wheel, as well as lines or intermittent lines. If the above-mentioned burn phenomenon occurs during the grinding process, the cause must be analyzed in a timely manner, effective measures must be taken to solve it, and batch burns must be eliminated.
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