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The reason why the bearing has common defects in grinding

Source: Bearing network time: 2013-02-13
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The reasons for the common shortcomings of the bearing in the grinding process:
The bearing is in the grinding process; its working appearance is ground by a high-speed rotating grinding wheel; therefore, if it is not operated and adjusted according to the operation instructions during grinding; it will present various shortcomings in the bearing operation; The overall quality of the bearing. The bearing is in the fine grinding; because the rough demand is very high; the grinding marks on the exterior of the work can often be observed with the naked eye. The appearance of the grinding marks is mainly the following. The embodiment presents the interlacing spiral traces. The reason for the trace is that the busbar of the grinding wheel is poor in flatness; there is a concave-convex appearance; during grinding; the grinding wheel and the workpiece are only some touch; when the workpiece or the grinding wheel reciprocates several times; And the naked eye can observe. The pitch of these spirals is related to the workpiece table speed and the workpiece rotation speed; together with the grinding wheel axis line and the worktable guide rail are not parallel.
. ㄒ唬┞菪咝 桑 饕 饕 饕 1. The grinding wheel is poorly trimmed; the corners are not chamfered; the coolant is not used for dressing, 2. The workbench guide guides too much lubricant; causing the workbench to float. Machine accuracy is not good, 4. Grinding pressure is too large, etc. The detailed reasons for the composition of the spiral: 1. The V-shaped guide rail is not rigid enough; when grinding, the grinding wheel is offset; only the edge of the grinding wheel touches the surface of the work, 2 . When the quarrel is repaired, the commutation speed of the workbench is unstable; the precision is not high; the trimming of the grinding wheel is slightly less, 3. The workpiece itself is poorly rigid, 4. On the grinding wheel, the sand that has been broken and dropped and the iron scraps under the grinding of the workpiece are attached to the outer surface of the grinding wheel; for this purpose, the finished grinding wheel should be washed or rinsed with cooling water, 5. The dressing of the grinding wheel is not good; there are some bumps.
Ǘ┍砻娉鱿 懔圩矗 懔圩矗 懔圩矗 砻嬖傧 砻嬖傧 懔圩 懔圩 懔圩 懔圩 懔圩 饕蚴怯捎谏 饕蚴怯捎谏 饕蚴怯捎谏 邢 邢 邢 邢 邢 邢 邢 邢 邢 邢 邢 邢 邢 邢 邢 邢 邢 邢 邢 邢 邢The detailed reasons for the appearance of fish scales on the surface of the workpiece are: 1. There are waste and oil on the surface of the grinding wheel, 2. The grinding wheel has not been trimmed, 3. The grinding wheel becomes dull. The trimming is not sharp, 4. The diamond cage is not strong; the diamond rocking or diamond quality is not good, not sharp. The hardness of the grinding wheel is not uniform. The main reason for the reappearance of the brushing surface on the surface of the working surface is that the coarse-grained abrasive grains fall behind; the abrasive grains are formed between the workpiece and the grinding wheel.
.ㄈ┕ぜ砻嬖谀ハ魇北焕壕咛逶蚴1. Traces left over from rough grinding; not worn out during fine grinding, 2. The coarse abrasive grains and fine abrasive grains in the coolant are not cleaned, 3. When the coarse-grained grinding wheel is just finished, the abrasive particles are simply dropped, 4. The useful period of data tolerance or the grinding wheel is too soft, 5. The resistance between the abrasive grain and the resistance of the workpiece data is not good. The surface of the workpiece has a straight waveform. The cross-section of the vertical axis of the workpiece is cut and enlarged. It can be seen that the periphery is similar to a sine wave. The line has no transitional translation; the orbit around the sine wave is the corrugated cylinder; also known as the polygon.
ㄋ ┎ ┎ ㄐ 奂 奂 奂 奂 奂 奂 奂 奂 奂 奂 奂 ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ ㄐ . . . . . . . Self-oscillation; therefore, the direct wave frequency on the workpiece is often more than one. The detailed reason for the occurrence of straight waveform traces 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; radial runout occurs, 7. Grinding wheel compaction arrangement or workbench "匍匐" and so on.
ㄎ澹┕ぜ砻嬖谀ゼ す 斜 簧 簧 簧 簧 耍 耍 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜 斜The island is shallow and leisurely. The appearance of the workpiece is burned during the grinding process; there are several reasons for the following: 1. The grinding wheel is too hard or the grain size is too fine to arrange 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 oscillating is too large; 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 repaired, 7. When the workpiece is coarsely ground, the burn is too deep; the amount of fine grinding is too much. The workpiece clamping force or suction is lacking; under the effect of grinding force; the workpiece has a stalling appearance, etc. How can the workpiece surface be black 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;
┍砻娲 ┍砻娲 诙 诙 诙 诙 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅 螅The primary reason for the roughness of the workpiece to meet the 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 oscillate too much, 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 not correct, 7. The quality of ultra-fine kerosene is not up to the demand, 8. Super fine time is too short, etc.
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