In addition, my domestic famous enterprises are: human group limited company, Wanxiang Limited by Share Ltd, Wafangdian City bearing Refco Group Ltd, Luoyang LYC Bearing Co., Ltd., Tianma Holding Group Co., Ltd., Zhejiang Wuzhou new spring group Co., Ltd., Dalian Metallurgical Bearing Group Co., Ltd. Hubei new torch group company, Harbin Bearing group, Shanghai Ji You machinery Limited by Share Ltd, Xiangyang automobile bearing Limited by Share Ltd, etc.

Two. Common problems and solutions of bearing industry in grinding process:

(1) the formation of spiral line: the main reason for the main reason is that the 1. grinding wheel is untrimmed, the corner is not chamfered, the coolant is not used for dressing; the 2. working table guide guide lubricating oil is too much, which makes the worktable floating; 3. machine tool precision is not good; 4. grinding pressure is too large and so on.

(three) the workpiece surface is grinded when the surface is grinded: the specific reason is: the traces left by the 1. coarse grinding, the fine grinding is not worn out, the coarse grit in the 2. coolant and the tiny abrasive grains are not clean; the 3. coarse grained grinding wheel is easy to fall off when the grinding wheel has just been repaired; the 4. material toughness validity period or the grinding wheel is too soft; the 5. abrasive toughness and the toughness of the workpiece material fit together. If there is a straight wave mark on the surface of the workpiece, we will cut the cross section of the workpiece through the cross section and enlarge it, and we can see that its periphery is similar to the sine wave. The center of the sine wave is moved around the axis, and the orbit around the sine wave is the wave cylinder, also called polygon.

(four) produce direct waveform trace: the reason is the movement of the grinding wheel relative to the workpiece or the periodic variation of the grinding wheel's pressure on the grinding of the workpiece, which causes the vibration. Such vibration may be forced vibration or self-excited vibration, so the direct wave frequency of the workpiece is often more than one. The specific reasons for the straight wave trace are: 1. wheel spindle clearance is too large; 2. grinding wheel hardness is too high; 3. grinding wheel static balance is not good or the grinding wheel blunt; 4. workpiece speed is too high; 5. transverse Qi knife is too big; 6. grinding wheel spindle bearing wear, with the gap is too large, radial runout; 7. grinding wheel press mechanism or worktable "crawl" and so on.

(five) the surface of the workpiece is burned during the grinding process: the surface of the workpiece is often burned during the grinding process, and there are several types of burns. One is the direction of the burn along the grinding wheel, the dark black patch, and the two is the line or the intermittent line. The surface of the workpiece was burned during the grinding process, and the following reasons were summed up: 1. the grinding wheel was too hard or the size was too fine; the 2. feed was too large, the cutting fluid was not supplied and the heat dissipation was poor; 3. the rotational speed of the workpiece was too low and the speed of the grinding wheel was too fast; the 4. grinding wheel was too large, and the grinding depth was constantly changed; 5. grinding wheel. The dressing is not timely or the dressing is not good; 6. diamond is sharp, the grinding wheel is not good; 7. when the workpiece is rough, the burn is too deep, the fine grinding retention is too small and is not worn off; 8. the clamping force or suction of the workpiece is insufficient, and the workpiece has a stop phenomenon under the action of grinding force. Then how do we know whether the workpiece surface is blackened during grinding? This can be checked by regular acid washing. After pickling the workpiece, it should be inspected immediately under the astigmatic lamp when the surface is moist. The normal surface is uniformly dark grey. If it is a software point, it appears cloudy and dark spots, and the perimeter is not.