When the gear is working, due to the elastic deformation and manufacturing error, each tooth of the gear will be abnormally meshed from the biting to the biting, causing impact, noise and vibration. For example, a gear with a factor of <2 overlap, each tooth will only hit the joint and produce 4 impacts. According to the gear engagement, the driving gear is from the root to the top of the tooth, and the driven gear is from the top of the tooth to the root. It is better to make the root and the top of the tooth concave, and the central convex drum is to be shaped and scraped. The tooth can't do this, so the tooth angle of the active and passive gears can be reduced to reduce the gear teeth and the impact.
If there is a reducer on the cold rolling mill, the transmission power is 110kW, the input speed is 1950r/min, and the two-stage reducer with the transmission ratio i=21 is whistling during use. After the analysis, it was decided to replace the high-speed gear shaft. The new gear shaft adopts the tooth shape control, and the noise is reduced from 93dB to 85dB, and the howling disappears.
The gear contact line is worth noting that the hard tooth surface material is hard, and the scraping helical gear tooth cutting is that the single tooth surface starts to gradually transition to the double tooth surface, and the cutting distance is reversed, so that there is always one end cutter on each side, which is single-sided cutting. The result is that the total error of the spiral and the spiral is convex at both ends, which is disadvantageous for the meshing, and the hardened gear reducer is mostly a helical gear. The contact line of the helical gear is inclined at an oblique angle to the tooth width direction. For example, the clockwise rotating drive gear is engaged from the A portion and is engaged from the B portion. For gear-toothed hard-toothed bevel gears, such as CNC gear grinding machines with electronic transmissions, it is also preferable to perform deformation along the contact lines A, B. Hard-toothed scraping is problematic in areas such as A and B, which inevitably produces severe noise and vibration. For this reason, it is possible to manually trim the convex drum at both ends of the main and passive gears with tools such as angle grinding wheels. The trimming length should be controlled as much as possible in the tooth surface width of 8 to 10 (medium size b), so as not to affect the effective tooth surface width. . According to the direction of the rotation, special attention should be paid to the shaping and the indentation (such as A and B) along the direction of the contact line. Although manual trimming is inaccurate, the time intervals of the teeth are not equal, but it is effective for reducing noise and vibration.
The processing of the bushing is rough and semi-finished. In order to facilitate the hot-spinning of the stator coil, the á282H6 hole is processed in conformity with the á280R6 hole to prevent the stator core from being caught by the stepped hole of the bushing when the hot-fit is pressed into the stator coil. Secondly, in order to make the stator coil hot-fit after finishing, the finishing basis is better. At this time, except for the hole of the stator core processed to the size, the remaining holes must be properly left, and the surface of each hole surface is rough. Degrees and other technical requirements meet design requirements.
The machining of the stator sleeve is the finishing after the hot core coil. (1) In order to prevent the stator coil from entering the iron scrap, oil, coolant, bump, scratch, etc. during the processing, the coil is short-circuited, leakage, etc., the coil is wrapped with sealing tape, and the outer circle is made of rubber and glue. The long slot on the upper block is blocked and the bond is firm. And sealed with grease at the joint between the workpiece and the tooling.
(2) The fine reference of the component is the inner hole of the stator core, and the core is not allowed to be processed after hot charging. Because the stator core hole is smaller than the two end holes, the grinding method can not ensure that the workpiece is finished in one time, and the coolant is easy to enter the coil, and it is difficult to ensure the coaxiality of each hole to the core hole. Therefore, we use the á185H7 and á282H6 holes at both ends of the boring process.
(3) When the hole is finely boring, in order to ensure the coaxiality between the holes of á185H7 and á282H6 and the inner hole of the stator core, the front and rear (two places) of the inner hole of the stator core of the workpiece are corrected during machining to make the dial gauge within 0.02 mm. The pull-tab is in the range of 0.01 mm on the positive side of the stator core inner bus bar, and then the holes are finely boring. When grinding the outer circle, the mandrel is pierced with the holes á185H7 and á282H6 as the reference, and the two ends are jacked up. According to the measured value of the hole of the box, the outer circle of á320mm is matched, and the end faces are ground to the requirements.
Butt welding flange is a kind of pipe fitting, which refers to the flange with neck and circular pipe transition and butt welded with the pipe. The butt welding flange is not easy to deform, has good sealing and is widely used. It has corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition. The distance between the welded junction and the joint surface is large, and the joint surface is free from welding temperature deformation.
Weld Neck Flange,Reducing Weld Neck Flange,Weld Neck Pipe Flanges,Long Weld Neck Flange
Henan Youlong Petroleum Engineering Technology Co.,Ltd , https://www.youlongenergy.com