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            Welcome to Guangdong Yutong Precision Machinery Co., Ltd

            Guangdong Yutong Precision Machinery Co., Ltd.

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            Different hardness parts of surface grinder

            Published on: 70-01-01 08: 0: 00 & nbsp& nbsp; Number of Views: < span id = "hits" > 735

            The surface grinder is ground to expose the scars, and the color is different from that of other parts. Circumferential scars, if each abrasive occurs at a certain interval, are caused by the mixing of coarse sand particles on the surface of the grinding wheel, so it shall be repaired before trial grinding. Sometimes the wheel or hard cutting debris falling off during through grinding is attached to the support knife or the uneven grinding of the support knife causes wheel stripes. Therefore, the support knife surface shall be grinded again and a large amount of cleaning grinding fluid shall be added. If it cannot be improved, the material of the support knife must be replaced. For through grinding, if the horizontal angle of the adjusting wheel or the guide plate is not adjusted properly, it often causes spiral stripes. In this case, the horizontal angle of the adjusting wheel can be adjusted to make a small gap between the discharge end and the abrasive, so as not to grind the abrasive,? Good results can be obtained. The cutting damage of the feed is actually small and difficult to identify, but what if the width of the grinding wheel is small and the amount of abrasive feed is too large? Obviously. There are tremor marks, and the grinding patterns often become irregular waves? It is the surface of the tremor pattern. The large part of the tremor pattern can be recognized by the naked eye according to the light reflection. When observed under the microscope, the wave shaped scar has the same depth. Surface grinder chatter is caused by various individual or related reasons. The main conditions are listed as follows: a. the abrasive itself is uneven. B. The grinding wheel ━ superhard bonding degree or too fine sand particles, loose assembly of grinding wheel and flange or flange and shaft, unbalanced grinding wheel, etc. C. About the abrasive support ━ the center of the abrasive is too high, the contact between the abrasive and the adjusting wheel and the supporting knife is incomplete, the top angle or thickness of the supporting knife is too thin, the supporting knife or tool holder or folding table is not fully locked, and the adjusting wheel and flange or flange and the adjusting axle are not locked. D. Machinery itself and driving mechanism ━ mechanical foundation or device is improper and easy to vibrate, bearing wear or clearance is too large, driving mechanism of adjusting wheel, uneven gear chain pitch, zipper Peilin damage, vibration caused by motor belt irregularity, and swing caused by motor, Peilin and belt irregularity of grinding wheel driven mechanism. E. Vibration caused by external vibration sources - machines with large swing such as punch, planer and slotting machine are installed near the machine. For the above abrasive materials, if the grinding wheel is hard, reduce the peripheral speed of the grinding wheel or replace the sharp and soft grinding wheel. If the chatter is caused by incomplete locking of all parts or excessive wear or clearance of bearing parts, sometimes the looseness caused by vibration of driving mechanism should be traced, so as to truly find out the cause and judge the cause of chatter. You can also observe the mode of chatter pitch, judge the cause in a certain range, and then review and find out. For example, when the grinding wheel specification is fixed with the abrasive, it can be determined that the chattering is the result of the change of roughness due to the change of average cutting area, and it can also be determined that the peripheral speed of the grinding wheel, sand particle roughness, working diameter, etc. do not change during grinding. Therefore, the reasons for the change of abrasive speed and feeding cut in should be investigated. The abrasives have cracks in the form of mesh cracks, which are difficult to identify with the naked eye. For example, the extreme ones peel off the traces by themselves. The reason is the local thermal expansion and material deformation caused by grinding the hot machined surface at high temperature. Especially for carburized steel, cracks are easy to occur. The countermeasures are to use a soft and sharp grinding wheel, reduce the cutting amount and add a large amount of clean grinding fluid. Abrasives are burned due to local overheating and fire on the grinding surface during grinding. It is generally difficult to find, but it is bright and light yellow after grinding. In addition, the use of hardness tester can be found that it is easy to be born in quenched steel, especially carburized or chlorinated steel, and the countermeasures are also the same. Surface roughness surface roughness is affected by grinding wheel particle size, binding degree, peripheral speed of grinding wheel, abrasive material, surface treatment grinding data, etc. Generally, the hard binding degree, fine particle size and less cutting amount can be used to obtain good appearance brightness. In addition, the abrasives occasionally have coarseness differences with each other. If the required luminosity is not achieved, pay attention to the uneven material of the grinding wheel, the pollution of the grinding fluid and the pollution of the working surface of the supporting blade and the adjusting wheel. In this case, the grinding fluid shall not only be filtered, but also a large amount of grinding fluid shall be added, and the falling sand particles or chips attached to the working surface of the adjusting wheel and the supporting blade shall be washed frequently. Although the true roundness is qualified as round by using the outer diameter micrometer, if? It is often not possible to fit holes with the same tolerance? There are only a few points at the joint. The causes of such an incomplete round skew are as follows: 1. Most of them are affected by the false circle shape before grinding. 2. Caused by improper support height of abrasive. 3. If there are keyways, other longitudinal grooves and uneven hardness in the non centrosymmetric shape of the abrasive, false circle phenomenon also occurs. If this shape is ground as much as possible, but if it is a last resort, reduce the cutting amount and grind it more times. 4. Reasons for grinding conditions? The peripheral speed and cutting amount of abrasive affect the true roundness after grinding. If the peripheral speed of abrasives is slow and the amount of abrasives removed at one time is large, the true roundness will be destroyed. In this case, increase and adjust the cycle speed or reduce the amount of abrasives, but chattering often occurs in case of overspeed. 5. The grinding wheel is too hard. 6. Since the belt moving chain of the adjusting wheel is pulled too tight or too loose, resulting in periodic out of round abrasives, the spring tightness of the zipper shall be adjusted to normal, but if the spring is elastic and tired, it shall be replaced. 7. If the abrasive is caused by the idle rotation between the two wheels, if it is through grinding, the inclination of the adjusting wheel shall be increased. If it is to stop grinding, it shall be set up when the size is reached? sign out. 8. The grinding pressure is too high, especially for hollow objects and pistons. The countermeasures are to use a soft grinding wheel or trim the grinding wheel at a faster speed. 9. Sufficient cooling water is required for grinding tubular or hollow objects such as pistons. Cylindricity 1. When grinding, the size of the inlet end of the abrasive is small, because the guide plate at the inlet end is biased towards the grinding wheel. If the size of the inlet end is small, it is because the guide plate at the inlet end is biased towards the grinding wheel. If the size of both ends of the abrasive is smaller than that in the middle, it is because the guide plates at the inlet and outlet are biased towards the grinding wheel. On the contrary, if the size in the middle of the abrasive is smaller than the two ends, it is because the inlet, inlet end or two ends of the guide plate are biased towards the adjusting wheel. The above situation is corrected by adjusting the guide plate parallel to the grinding wheel. If the problem still exists, check whether the inclination angle of the adjusting wheel is correct. 2. When grinding is stopped, if the poor cylindricity of the abrasive is caused by the following reasons: a. the grinding wheel or adjusting wheel is unevenly trimmed, the correction method is to adjust the horizontal angle of the adjusting wheel or re trim the grinding wheel and adjusting wheel straight. B. For this condition caused by supporting the blade, carefully check whether the knife holder is bent, worn or improperly installed. C. If the sliding plate of the trimming seat is slightly improperly adjusted or worn, it needs to be readjusted or reprocessed to ensure the flatness of the trimming seat. True roundness when grinding, although the dimensions of each section are the same, but the full length is not parallel, first check the pre-processing true roundness of the abrasive. If there is too much eccentricity, press it straight and correct it. Secondly, check the reserved grinding amount, which should be close to 3 times of eccentricity, and grind it several times. During the first grinding, the cutting amount should be small, the inclination angle of the adjusting wheel should be large, the speed should be low, and the grinding wheel should be adjusted to fully contact with the abrasive, so as to straighten the abrasive most effectively. The dimensional error of dimensional accuracy grinding is the same, which is most likely due to feed error. The dimensional deviation between other abrasives is related to the confusion of feed amount. Therefore, the fixing device of tool holder and supporting tool should be reviewed. The adjusting wheel mechanism and the feed drive mechanism, the tool holder and the support knife, and the fixing screw are loose, and they are still displaced, so it is difficult to determine the feed working position. As for the elasticity of the feed drive mechanism, if the poor lubrication is stuck, it will cause the phenomenon of jumping feed, resulting in the uncertainty of feed position, the gap caused by the wear of sliding surface or auxiliary rail, and the grinding size is not on time, it shall be scratched and adjusted again. Stop grinding the fixed screw of the feed handle and the relaxation of the micro feed change locking nut have also become the reasons for the confusion of the feed. If the bearing of the adjusting wheel is loose, it also has dimensional deviation, so the bearing shall be adjusted or scratched again. If the grinding diameter increases slowly with time, it is caused by the wear of the grinding wheel

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