The examination of L. wheel

Grinding wheel in the device must pass strict inspection before using, have defects such as cracks grinding device using the absolute prohibition.

( 1) wheel mark check. Grinding wheel without signs or sign is not clear ( diamond ), cannot check, confirm the grinding characteristics of the wheel, regardless of whether a defect, not into use.

( 2) wheel defect reflection. The reflection method is visual and sound reflection:

①visual examination is direct with the naked eye or with the aid of other appliances to observe whether the surface of wheel crack and damage defects.

The sound reflection or percussion experiment, mainly for grinding wheel of internal defects, reflection is the use of wooden hammer grinding wheel. Normal wheel sound sonorous, ( glass grinding wheel ) sound boring, hoarseness, articulate problems.

( 3) wheel inversion strength inspection. For the same type of batch grinding wheel should be inversion strength testing, without strength inspection batch is strictly prohibited by grinding wheel device.

The 2 grinding wheel device

( 1) check the wheel features can fit the use of grinding wheel spindle, and the size can match.

( 2) the grinding wheel to be freely assembled to the grinding wheel spindle, not squeeze ( diamond ). Grinding wheel diameter and spindle and chuck joint gap is appropriate, to prevent too much or too little. The common surface clean, no impurities.

( 3) the grinding wheel chuck should be symmetrical, pressing surface radial width should be equal. ( diamond tools ) pressing surface is flat, and the wheel side surface contact is abundant, clamping stability, avoid wheel two side surface due to unbalanced force and deformation and fragmentation.

( 4) the chuck and the wheel between the end face of the clamp pad thickness should be necessarily flexible data liner ( such as asbestos rubber sheet, elastic thick paperboard or leather ), so that the clamping force average dispersion.

( 5) the fastening wheel elastic levels should be to press enough to drive the grinding wheel sliding does not occur as appropriate, should not be too tight. When using a plurality of bolts fastening kcal disc, should according to the diagonal pairwise sequence gradually tightened to stop along the circumferential direction on average, one fastening bolt, or once a bolt tightening. ( the glass grinding wheel grinding wheel chuck can only use standard ) fastening plate in hand, avoid using lengthening wrench or by knocking method increase the tightening force.

3 wheel balance experiment

Formed grinding wheel unbalance reason is because the wheel 's center of gravity and the inversion of misalignment. It is the reason of grinding wheel manufacture and device defects, for example, wheel density average, face are not parallel, shape or form hole concentricity error, eccentric and grinding wheel device. Unbalanced wheel at high torsion occurs when force wheel deviated from the center of the centrifugal force, and then cause the wheel vibration. This fruit is not only influence the grinding quality, but also accelerate the wear of grinding wheel spindle bearings; when the centrifugal force beyond the wheel strength promised limitations, ( diamond tools ) will form grinding wheel.

The new grinding wheel and the first dressing grinding wheel, and the discovery of running the unbalanced wheel should be balanced experiment. Regulating wheel balanced approach dynamic equilibrium and static equilibrium in two ways.

( 1) dynamic balancing method. The approach with in machine tools sensor, direct show reversed when the wheel is mounted against the measure, after adjustment and balance block status and interval, will not balance control to a minimum.

( 2 ) the static equilibrium method. Static balance adjustment in the balance frame length, using manual method to find out the wheel center, equipped with balance block, adjustment and balance block position, until the wheel balance, general in eight direction of the wheel balanced.

Adjust the balance after the wheel need put on protective cover after the blank experiment. Blank experiment time: diameter≥ 400mm, idle time is greater than 5min; diameter < 400mm, idle time is greater than 2min.

Blank experiment period ( diamond ), the operator should stand on the side of safety status of grinding wheel, grinding wheel in front of or not standing in the tangent direction, provide against any misfortune.

The 4 grinding wheel dressing

On the grinding wheel dressing on superior grinding function and accurate geometric shape, prevent the present wheel passivation, infarct size and shape distortion, often using the dressing is the diamond pen. When operating, dressing, dressing too much things position bias defects (such as inverse wheel reverse bias, tilt angle of too much and too small ) or dressing amount is too large, will make the grinding wheel has the intense vibration, or cause the diamond pen gnaw knife, serious also lead wheel break. Accurate operation method is: diamond pen in the grinding wheel intermediate degree line 1～ 2mm, Shun wheel reverse bias, and the degree of surface inclined at an angle of 5° ~ 10°. Dressing to the average strength, speed stability, ( glass grinding wheel dressing ) a quantity is not too large. The operator should stand in the wheel lateral safe position, not standing in the grinding wheel front operation.

After finishing the wheel must be from the new reverse experiment, can be used.

5 wheel storage

( 1) grinding wheel in the handling, storage, not subject to intense vibration and shock, handling do not let rolling wheel, so as to avoid the formation of crack, surface damage.

( 2 ) with the wheel features and safe speed shall not be applied arbitrarily mark or damage, lest form use disorder.

( 3) the wheel storage time should not exceed the period of validity of grinding wheel, resin grinding wheel and rubber coupling agent since the date of factory, if stored longer than a year, subject to reverse passing test before use.

( 4) wheel hosting site should adhere to the dull, suitable temperature, prevent and other chemicals are mixed together. To avoid the grinding wheel, low temperature, damp overheating and harmful chemicals that strength reduction.

( 5) the grinding wheel should be based on the specifications ( diamond tools ), shape and size differences, classify and place, avoid overlapping damage or because the stored defective cause wheel deformation.