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Bearing in grinding (2)

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The surface of the workpiece has a straight wave trace. We cut the cross-section of the ground axis of the milled workpiece and enlarge it. It can be seen that its periphery is similar to a sine wave. It has no transitional translation along the axis of the axis; the orbit around the sine wave is The corrugated cylinder surface; also known as the polygonal shape. The reason for the straight waveform is the movement of the grinding wheel relative to the workpiece or the periodic change of the pressure of the grinding wheel on the workpiece to cause oscillation. This oscillation may be forced to oscillate; It may be self-oscillation; therefore, the direct wave frequency on the workpiece is often more than one. The detailed reason for the straight waveform trace is:
1. The gap of the grinding wheel spindle is too large.
2. The hardness of the grinding wheel is too high,
3. The static balance of the grinding wheel is not good or the grinding wheel becomes dull.
4. The workpiece speed is too high,
5. The horizontal file is too large,
6. The grinding wheel spindle bearing wears; the cooperation gap is too large; the radial runout occurs,
7. Grinding wheel compaction arrangement or workbench "匍匐" and so on.
The surface of the workpiece reproduces the burn marks. The appearance of the workpiece tends to burn during the grinding process; there are several types of burns; the first is the direction of the burn along the grinding wheel; the dark black plaque, the second is the line or the intermittent line. The workpiece is polished. Burned in the process of processing; summarized in the following reasons:
1. The grinding wheel is too hard or the grain size is too fine to be too dense.
2. The feed rate is too large; the supply of cutting fluid is lacking; the heat dissipation condition is poor,
3. The workpiece speed is too low; the grinding wheel speed is too fast,
4. The wheel is too oscillated; it burns due to the constant change of the grinding depth.
5. The dressing of the grinding wheel is not timely or the repair is not good.
6. Diamond is sharp; the wheel is not well trimmed,
7. The burn is too deep when the workpiece is coarsely ground; the amount of fine grinding is too much.
8. The workpiece clamping force or suction is lacking; under the effect of grinding force; the workpiece has a stalling appearance.
Then how does the appearance of the workpiece know how to burn in the grinding process? This should be checked by regular pickling. After the workpiece is pickled; when the surface is wet; it should be visually inspected immediately under the astigmatism lamp; the normal appearance is evenly dark gray. If it is a software point; it is cloud-like dark black mottle; The perimeter is not fixed. If it is decarburized, it will show gray or dark black spots. If it is grinding cracks, the crack will be cracked; if it is burned; first, the appearance will show dark black patches along the grinding direction; second, the lines will appear. Or intermittent lines. If the above-mentioned burn appearance is presented in the grinding process; it is necessary to analyze the cause in time; adopt a useful method to solve it;
Appearance roughness does not meet the requirements of the bearing surface roughness of the specification and process requirements; but in the grinding process and super-precision process; due to various reasons; often fail to meet the requirements of the rules. The primary reason for demand is:
1. The grinding speed is too low; the feed rate is too fast; the feed rate is too large; the no feed grinding time is too short,
2. The workpiece speed is too high or the workpiece axis and the grinding wheel shaft are too large.
3. The grinding wheel is too thick or too soft.
4. The dressing speed of the grinding wheel is too fast or the trimming arrangement is too large.
5. The diamond of the dressing wheel is not sharp or of poor quality.
6. The quality of ultra-precision oilstone is not good; the orientation of the device is incorrect.
7. The quality of ultra-fine kerosene is not up to demand.
8. Super fine time is too short, etc.

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