LEMAN cutting wheels Grinders Common Faults and exclusion method:

Common Problems and Solutions

Motor does not rotate (electromagnetic sound)

Reason: 1, starting capacitor damage; 2, three-phase metal cutting wheels‍ power-off phase; 3, the power switch is damaged; 4, bearing stuck; 5, winding burnout tile cutting wheels.

Remedy: 1, replacement capacitors; 2, Chaxiu circuit; 3, replace the power switch; 4, replace the bearings; 5, repair winding

Motor does not turn (no electromagnetic sound)

Reason: a power switch is damaged; 2, power outages; 3, winding burnout

Remedy: 1, replace the power switch; 2, waiting for power; 3, repair winding

Fragile or excessive wheel wear

Reason: 1, wheel type is not correct; 2, wheel expired or poor quality; 3, bearing damage; 4, incorrectly installed

Remedy: 1, corresponding to the type of turbo saw blade replacement wheel; 2, replace qualified wheel; 3, replace the bearings; 4, properly installed

Sound is not normal

Reason: 1, bearing wear serious; 2, wheel installed incorrectly; 3, indeed phase operation; 4, winding fault

Remedy: 1, replacement of bearings; 2, properly installed wheel; 3, Chaxiu power; 4, Chaxiu winding

Winding burned

Reason: a stator, a rotor sweep chamber; 2, three-phase motor-phase operation; 3, single-phase motor 380V power mistakenly access

Remedy: 1, replacement of diamond reinforced conrete bearings; 2, Chaxiu power; 3, Chaxiu power‍

tile cutting wheels abrasive cutting wheel Precautions

(1) should be based on the progress of the material to be processed and processing requirements of the device, select the grinding wheel thickness. Relatively soft metallic material, diamond cutting discs such as copper and aluminum, use coarse grinding wheel, high precision machining device, to use the smaller wheel.

(2) to be processed accor

(3) shall not be used for wheel cracks, defects and other defects or disability, the installation must be secure. That, in the course of time should also be noted that there are cracks in wheel once found, defects and other defects or disability, immediately stop using it and replace it with new; when activity should be stopped immediately tightened.

(4) When grinding, the operator should wear protective glasses and gloves to prevent splashing of metal debris and sand on the human body injury.

(5) the pressure exerted by the device on the metal cutting wheels‍ ground should be appropriate, too general overheating leaving the machined surface annealing, can not be used in severe cases, also causing excessive reducing wheel life.

(6) is smaller than the width of the grinding surface of the grinding wheel device, in the grinding process, not always a part of the grinding wheel, the grinding surface of the grinding wheel to be a cycle of about a pan is intended to enable grinding wheel surfacing can remain relatively flat, to facilitate later processing.

(7) In order to prevent overheating of the machined surface grinding device annealing, may at any time be cooled grinding parts deep water.

(8) regularly measure the insulation resistance of the motor, should ensure that not less than 5MΩ). Leakage protection device should be used with circuit Tile cutting discs breaker and power connections.

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LEMAN cutting wheels How to care

l. Check the wheel 

Wheel before installation must undergo a rigorous inspection, cracks and other defects of the grinding wheel is absolutely not allowed to install and use. 

(1) Check the wheel marks. Far no marks or reinforced concrete cutting discs‍ wheel can not check, confirm wheel wheel characteristics, whether or not defects are not used. 

(2) wheel defect inspection. Its inspection methods are visual and sound checks: 

① direct visual inspection with the naked eye or with other appliances inspect wheel surface cracks or damage and other defects. 

② sound check, also known as percussion test, mainly for internal defects in the wheel, check method is to use small wooden hammer percussion wheel. Normal wheel crisp sound, sound dull, hoarse, indicating a problem. 

(3) the strength of the wheel rotation test. On the same model number of wheel rotation strength random testing should be carried out without the strength test batch prohibited wheel installation. 

2. Wheel Installation 

(1) check the wheel characteristics are consistent with requirements, the size of the grinding wheel and spindle matches. 

(2) The free wheel fitted to the wheel spindle, can not squeeze. The inner diameter of the wheel spindle and chuck with the gap properly, to avoid too large or too small. Mating tile cutting wheels‍ surfaces clean and free of debris. 

(3) Wheel chuck should be symmetrical, radial clamping surface width should be equal. Pressed flat surface, full contact with the wheel side, clamping firmly against the sides due to the unbalanced wheel force and deformed or even broken. 

Should be caught between the pads (4) Chuck and wheel end face of a certain thickness of the flexible gasket materials (such as asbestos rubber sheet, elastic thick cardboard or leather, etc.), the chuck clamping force evenly distributed. 

(5) the tightness of fastening the wheel should not compress enough to drive wheel slippage is appropriate, not too tight. When a disc with multiple bolts calories, paired diagonal sequence should gradually tighten evenly ban order fastening bolts along the circumferential direction, or time diamond cutting discs‍ to tighten a bolt. Fastening only with standard wheel chuck wrench, prohibit the use of a wrench or take a long way to increase by beating tightening force

tile cutting wheels Wheel balancing test

Wheel imbalance caused due to gravity does not coincide with the wheel axis of rotation. The reason is that it produces defects in manufacture and installation of the grinding wheel, e.g., tile cutting wheels‍ wheel uneven density, the end face is not parallel to the bore and outside geometry or concentricity error, wheel mounting eccentricity. Unbalanced rotation of the grinding wheel at high speed to produce a centrifugal force forcing the wheel deviates from the axis, causing the wheel vibrations. The consequences affect not only the grinding quality, but also accelerate the wheel spindle bearing wear; wheel strength when the centrifugal force exceeds the allowable range, the wheel will cause fragmentation. New wheel and trimmed by the first wheel, and the discovery of the operation should be carried out unbalanced wheel balance test. There are two ways to balance the static and dynamic balance adjustment wheel balancing methods tile cutting wheels‍. 

(1) Balancing Act. The method by means of a sensor mounted on the machine, the direct display of the unbalance wheel apparatus rotates, and the distance by adjusting the position of the balance weight, the amount of unbalance to a minimum. 

(2) static balance method. Static balance adjustment in the balance shelves conducted to identify the center of gravity wheel by hand way, the installation of balance blocks, adjust the position of the balance weight until the balance wheel, generally available in eight directions so that the grinding wheel to maintain balance. reinforced concrete cutting discs‍ Wheel need to be installed after the protective cover to adjust the balance after idling test. Idling Test time: diameter ≥ 400mm, idle time is greater than 5min; diameter <400mm, idle time is greater than 2min. 

During the idle test, the operator should stand side wheel safety position, shall not stand in the front wheel or tangential direction, to prevent accidents. ‍

tile cutting wheels grinding wheel

Can periodically dressing the grinding wheel to maintain good performance and correct geometry appears to avoid passivation of the wheel, and form plugging distortion is often used metal cutting wheels‍ dresser diamond pen. In operation tile cutting wheels, the dressing tool position is too high, improper trimming direction (eg reverse the direction of wheel rotation, the tilt angle is too large too small) or trimming excessive, will cause the wheel to generate strong vibration, or cause a gnawing diamond pen knife, but also a serious cause wheel breakage. The correct way is: diamond grinding wheel is in the center of the pen 1 ~ 2mm at the horizon, along the direction of wheel rotation, and the horizontal tilt angle of about 5 ° ~ 10 °. When dressing to force uniform, steady pace, not too big a dressing amount. The operator should stand on the side of safety wheel position, the front wheel can not stand the operation.

After Dresser by post must be re-rotation test before use.

5. Wheel of Transportation

(1) wheel in the handling, storage, and can not be subject to strong vibration and shock, when moving the scroll wheel is not permitted to avoid cracks, surface damage.

(2) printed with wheel speed characteristics and tile granite cutting discs safety signs are not free to smear or damaged, avoid using the confusion.

(3) Wheel Wheel storage time should not exceed the period of validity from the date wheel binder resin and rubber from the factory, if stored for more than a year before passing the test after use is subject to rotation.

(4) wheel storage site should be kept dry, suitable temperature, to avoid mix with other chemicals. Prevent wheel damp, cold, overheating, and exposure to hazardous chemicals to reduce the intensity of erosion so.

(5) wheel should be based on metal grinding different specifications, shapes and sizes, classification place, to prevent damage or laminated wheel deformation due to improper storage.‍

abrasive cutting wheel grinding wheel cutting steel

This method uses high-speed rotating grinding wheel cutting steel. Grinding wheel with fiber, resin or rubber bonded abrasive made​​. In skilled manual operation, the abrasive cutting disc‍ wheel can be quickly and accurately cut, and cut neatly, no glitches. Only use wheel straight cuts, but the vast majority use it enough. 

Wheel is usually used to cut the pipe. Grinding wheel factory also used unreasonable length slot. 

On-site repair usually handed grinders. However, the use of hand-produced work when operating grinders lot of dust and the "steel scrap, so they need dusting or protection devices. Production plant used grinders generally safe cooling system, so that both can reduce dust, and can prevent materials cause flap disc for stainless steel‍ thermal damage.

LEMAN cutting wheels Abrasive cutting - the installation site

1, the opening direction of the grinding machine should as far as possible towards the wall, not facing the pedestrian has equipment and personnel to operate the channel or cutting wheels‍ nearby; 

2, if the grinding machine has been installed in a nearby device or channel, away from the grinding machine at the opening 1 ~ 1.5M 1.8M metal mesh should be set high to shield isolation; 

3, grinders shall be installed in a corrosive gas or flammable and explosive; 

4, grinders ground installation site should be kept dry; 

5, grinders use the site should ensure abrasive cutting disc‍ adequate illumination;