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3. Carefully observe that the spark is too large when the spark is being grounded; the knife should be retracted immediately. The spark should not have a continuous appearance when it is fully roughed; if the yaw value of the broken part exceeds one quarter of the grinding amount; When the secondary grinding wheel is near the workpiece, the spark is gradually increased; it should be checked whether the temperature of the tip is too high; if the tip temperature and the workpiece are in common, the tip of the tail should be tight. If the spark becomes larger when passing through the bracket, the top of the bracket is marked. The location is unreasonable; the temperature is raised at this point. There should be no continuous view of the spark during the fine grinding; if the decision is severe, the yaw and the amount of grinding should be measured; when the yaw exceeds one quarter of the grinding amount, the grinding is not stand up. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
4. Strictly control the processing quality and accuracy when the diameter values ​​of the points are not common; the bracket and tailstock should be adjusted in time.
(1) After coarse grinding and semi-finishing; the cylindricity of the workpiece should not exceed the difference. If there is a broken fire in the elliptical degree, the yaw value should be measured; if the value exceeds 30μm, it must be straightened. Grinding from the beginning, grinding through several rounds; when the total feed exceeds 50μm; the spark will no longer be broken; the ellipticity should be zero, if the ellipticity is still beyond the tolerance; the wheel should be trimmed Try again; if the ellipticity is still not eliminated; you should check whether the top hole can be damaged or wounded (at the moment the workpiece looks polygonal).
(2) The reason for the appearance of multi-edge after grinding and trimming measures are as follows: if the grinding wheel has been blunt; it should be trimmed if the grinding wheel has significant oscillation; the balance should be adjusted, and the head frame and motor frame vibration isolation equipment are damaged; Correction, if the workpiece itself oscillates too much; should be properly slowed down, when the tip is too tight or too loose; must be adjusted.
(3) If the rough grinding presents a large spiral appearance; the reason is that the grinding wheel is not well-tuned; the grinding wheel must be uniform when finishing the grinding wheel; there must be no significant single-angle spark appearance; the workpiece surface is easy to appear after the grinding wheel is blunt Large spiral.
(4) During fine grinding; the workpiece tends to appear rough, scratched and the surface of the coolant is not clean. To avoid this appearance; the newly refined grinding wheel should be brushed with a wire brush (note safety).
(5) When the workpiece exhibits the appearance of taper, drum shape, saddle shape, and the diameter of both ends is larger or smaller when finishing grinding; the bracket, tailstock, grinding wheel overrun and the number of workpieces and the stop of the grinding wheel at both ends of the workpiece should be adjusted. time.
5. Strict control of the temperature of the two tip parts can determine whether the tip tightness is reasonable according to the change of the temperature of the two tips. Usually, the temperature of the tip is slightly higher than the temperature of the workpiece.
(1) The reason why the temperature of both tips is too high: one is too tight; the other is that the tip is not concentric with the middle hole of the workpiece. If the top is too tight; first loosen the tip; Adjust the tightness of the top.
(2) If the temperature of a certain tip is too high, it is clarified that the tip is not concentric with the middle hole of the workpiece.
(3) When the temperature of the two tips is common with the temperature of the workpiece; the two ends of the workpiece will not exhibit multi-angle appearance; and the spark is more uniform; at this moment, the grinding can be continued. If the two ends of the workpiece are polygonal, the tip should be tightened first; If the workpiece is not burned, it can be ground in full. When the spark at both ends of the workpiece is uneven, it is necessary to tighten the tip of the tail.
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Rolling bearing residual magnetic skill conditions (2)
Source: China Bearing Network Time: 2018-03-15