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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>5M1083A centerless grinding wheel wheel bearing spindle bearing research and analysis of the cause of death and its correction Analysis and Correction of the Death Cause of 5M1083A Centerless Grinding Wheel Bearing
In the gold cutting equipment produced by a factory; there is a M1083A centerless cylindrical grinding machine produced by Haining Machine Tool Plant. The equipment is characterized by good rigidity, high production efficiency, excellent equipment performance; can be used to the needs of mass production. The front and rear bearings of the cutting wheel and the guide wheel spindle are all selected from the film reaction hydrostatic bearing; the bearing is a symmetric layout of the four oil chambers. The equipment has been presented with the grinding wheel spindle hydrostatic bearing vice research and death; we have succeeded in it. Correction. The following is the reason for the repair process to the equipment attack; the static pressure bearing sub-correction process is summarized. The cause of the problem is that the grinding wheel spindle (grinding wheel spindle) bearing is mainly in two aspects: the first is the smooth oil pump. Blockage of the oil supply oil passage: The second is the blockage of the main oil passage into the bearing oil chamber. These two causes will directly incur the lack of smooth oil or oil pressure into the bearing oil chamber and cause the bearing of the grinding wheel spindle to start. The attack is dead. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
The blockage of the oil supply circuit is mainly at the oil filter. There are three oil filters on the M1083A oil supply road; especially the fine filter is easy to be blocked or the filter paper is melted to reduce the oil supply pressure; the oil quantity is lacking; Low; and the failure of the main shaft to start the electrical interlock system; caused the hydrostatic bearing to die.
The oil passage blockage entering the bearing oil chamber is mainly at the gap of the diaphragm reaction throttle valve. When the gap is severely blocked; the amount of oil entering the oil chamber is small; the oil pressure is very low; the spindle cannot float well in the bearing; When the grinding wheel is turned, it will not turn or be heavy; once the grinding spindle is started, the static bearing will be killed.
1. 2-105mm and bearing cooperation gap 0. 055 ~ 0. 060mm2. 2-? 105mm ovality, taper tolerance 0. 002mmM1083A wheel frame spindle sketch M1083A wheel frame spindle parts as shown on the right. 2 correction process we will After the grinding wheel spindle was removed, it was found that the main problem was in the front bearing of the main shaft; the rear bearing did not show significant traces of death. Firstly, we used the micrometer to accurately measure the front journal of the main shaft; the practical scale was 105-0. 008-0.007mm; The inner diameter of the bearing is measured by the inner diameter dial gauge to be ?105+0.048+0.051mm; thus, the cooperation gap is between 0.055 and 0.059mm; and the cooperation gap requirement of the hydrostatic bearing pair is 0.006D (D is the nominal size of the spindle journal); M1083A spindle journal D=105mm; the cooperation gap skill requirement should be 0. 063mm. The cooperative gap depicting the demand is 0. 055 ~ 0. 060mm; It can be seen that it can satisfy the cooperation gap between the main shaft and the bearing. The roundness of the spindle journal is 0. 001mm; the tolerance of the 0.002mm roundness of the satisfactory drawing requirements; then the reversal precision and rigidity of the spindle part of the equipment are ensured. Can be seen from the removed spindle; spindle journal There are no obvious scars on the outside; we will polish the spindle journal on the C630-1 lathe; the appearance will reach Ra0. 8μm; after polishing, the spindle journal will be measured from the head; its scale is 105-0 010-0.008mm. Others; if there is a significant flaw on the outer surface of the spindle journal, it is necessary to finish the spindle journal to ensure the appearance roughness: if it is after grinding; the journal becomes ridiculouså‘浜 å‘浜 å‘浜 湎 湎 湎 èž… èž… 虮匦攵 嶂峋 嶂峋 嶂峋 嶂峋 嶂峋 嶂峋 嶂峋 嶂峋 嶂峋 嶂峋 嶂峋 嶂峋 嶂峋 嶂峋 嶂峋 嶂峋 薷矗 薷矗 薷矗 薷矗 薷矗 薷矗 é” é” é” é” é” é” é” é”赜跋ç„ç’žFu mother recruited 9 ã·.
Look at the inner hole of the bearing; find that there is a significant conflict mark on the front bearing hole; while the spindle journal and so on are in the tolerance range by checking the accuracy of each; remove the excess tolerance element of the main shaft. The blockage is severe. After the spindle journal polishing reaches the required surface roughness; the correction of the bearing inner hole is more messy; it is not easy to operate; the precision is not good enough. Let us first rely on the spindle journal? 105-0.010-0.008mm Scale and demand between the main shaft and the bearing between the 0. 063mm depicting a diameter of ?105+0.038+0.040mm to check the mandrel; its taper and roundness tolerance is 0. 002mm; Together with the depiction and manufacture of the research 105+0.038+0. 040mm mandrel can penetrate the inner hole of the bearing smoothly and use the powder to check the inner rod and the inner hole of the bearing. The correction of the inner hole of the bearing is completed. Finally; Also use the inner diameter dial gauge to accurately verify the bearing bore dimension.
Checking the strengths of the inner hole with a heart stick is a heart-stick. The heart-warming ツ诳 ツ诳 媸 媸 媸 饬浚 饬浚 蟆 蟆 蟆 蟆 蟆 蟆 蟆 蟆 蟆 蟆 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 岫 岫 岫 岫
When grinding the inner hole of the bearing; pay attention to the amount of diligence; repeat the research; repeat the measurement; until the demand stops in all aspects. It should be noted that; when correcting the bearing hole of the dead; never use the scraper to scrape the inner hole of the bearing; It is easy to make the front and rear bearing hole concentricity and the roughness of the repaired bearing hole out of tolerance; together, the pits caused by scraping are left on the inner surface of the repaired bearing hole; the spindle bearing sub-pressure zone is damaged during the device correction work. Establishing.
After the correction of the spindle journal and the bearing hole is completed; all the hydraulic components and oil pool of the smooth oil passage are completely removed. In particular, the thin film reaction throttle valve is repeatedly diverged and removed by using clean kerosene; The gap G0=0.07mm and the smooth system oil supply pressure P=1MPa; the pressure of the four outlets is flat. Without the blockage; the hand of the spindle wheel is lightly changed by hand; the wheel can be started. Spindle; otherwise it is necessary to differentiate and remove the film reaction system from the beginning. After the spindle of the grinding wheel is started; it is not rushed to apply the load; it is necessary to pass the continuous empty work for at least 4 hours without any abnormality; it can be put into production. The hydrostatic bearing vice research has been completely removed.
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Source: Bearing network time: 2017-12-07