Grinding wheel for centerless grinding machines.
Kinik

Grinding wheels
Crystec Technology Trading GmbH

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Centerless grinding wheels

For centerless round grinding of work pieces, different versions of grinding wheels can be used, which have to be adapted to the grinding machine type and for the application.

Centerless grinding wheel

Centerless grinding machines can be configured for through feed grinding and for infeed grinding. A special version of through-feed grinding is end-feed grinding.
The regulation wheel is rotating the parts while the grinding wheel is doing the stock removal.

Throughfeed grinding

In throughfeed grinding or thrufeed grinding, the parts run trough the machine continuously on a blade. Only cylindrical work pieces can be ground this way. The grinding wheel width has to be adapted to the length of the work piece. The diameter of the grinding wheel has to be adapted also to the dimension of the work pieces, the stock removal and the throughput. The parts are rotated by the regulation wheel or feed wheel. The opposite grinding wheel is removing stock until the final diameter of the parts has been reached. The axis of the regulating of feed wheel is not exactly parallel to the axis of the grinding wheel, but little bit tilted. This is causing the movement of the parts on the blade through the grinding machine. The shape of the regulation wheel or feed wheel has to be adapted and the surface therefore is slightly concave.

throughfeed grinding endfeed grinding
Trough-feed grinding End-feed grinding

Infeed grinding

Infeed grinding allows also grinding of parts that are not cylindrical. The work piece is inserted in the machine by a robot. Then regulation wheel and grinding wheel a driven closer together and grinding starts. The wheels can be profiled in order to grind complex surfaces.

infeed grinding
In-feed grinding

Recommendations

The table below is for throughfeed grinding. For plunge grinding, select an abrasive one size finer to maintain surface finish.

Centerless Grinding Wheels Recommendations

Centerless Feed Wheels:


Standard dimensions

Centerless Grinding Wheels Dimensions

General Comments:

  • Safety-MOS: General operating speeds under 2000m/min (33m/s) are for vitrified bond and under 3000m/min (50m/s) are for organic bonds. For special speeds contact us.
  • For form grinding or plunge grinding, Please specify the necessary thickness and shape according to your needs.
  • The wheel thickness over 400mm (16") may be made by twin grip (Two pieces butted).
  • Other sizes may be made on request.

Proper Wheel Mounting:

  1. Throughly clean the spindle and flange bearing area of all dirt and foreign material.
  2. Inspect for worn, distorted or damaged areas on flanges and spindle.
  3. If mounting a wide centerless wheel on a spindle (e.g twin-grip) do not use grease or other petroleum based lubricants. Use a silicone spray lubricant on the spindle to ease mounting the wheel, if necessary.
  4. Insure mount up arrow is at the top of the wheel. In the case of butted sets,assemble so that the arrow is formed across the top of the wheel face.
  5. Ensure proper blotters supplied with the wheel are installed; one on each flange mating surface.
  6. Ensure blotter flange and screw up the bolts only finger tight.
  7. Using a torque wrench, tighten all the bolts in an alternating pattern from side to side with the specified torque.
  8. Retorque the flange bolts to specification after the first 8 hours of operation.

Feed wheels / Regulation wheels

Feed Wheels Dimensions


Dressing and truing of grinding wheels

The purpose of the dressing and truing is to restore the original cutting geometry and to correct the flatness and roundness of the grinding wheel. This is done in many cases by diamond dressers.

Abrasives, grinding wheel material

Grinding machines can be equipped with different grinding wheels. The grinding wheels can consist of aluminium oxide Al2O3, cubic boron nitride cBN or diamond. cBN and diamond grinding wheels are very hard and can be used for high precision grinding of very hard parts. The life time is very high. Diamond wheels have some limitation for grinding steel because of the solubility of carbon in iron.

Mesh size

The grain size of the abrasive material of a grinding wheel is determined by the mesh size of the sieve that is used for the selection of the material. The mesh size is therefore a measure of the roughness of the grinding wheel and determines the removal rate and the surface roughness of the workpiece after grinding.

rough medium fine very fine ultra fine
10 12 14
16 20 24
30 36 46
54 60
70 80 90 100
120 150 180 220
240 280 320 400
500 600 700 800
1000 1200 1500 2000
2500 3000 4000 6000

Bonding

Bonding of the abrasiv material can be vitrified, metallic or resin. Vitrified bonding is used frequently. High stock removal rates can be achieved and the rigidity allows high precision grinding. This bonding is not sensitive to water, acid, oil and it is not temperature sensitive either. Resin bonding is rather soft and is used to achieve very smooth surfaces. Metallic bonding is used for special purposes, e.g. for electrical discharge truing. Regulation and feed wheels use rubber bonding.

very soft soft medium hard very hard
D E F G H I J K L M N O P Q R S T U V W X Y Z

Kinik Grinding wheels

We can offer to you various types of grinding wheels from Kinik, Taiwan. Kinik is a large grinding wheel manufacturer with very good reputation. Please give us your grinding wheel specs so that we can work out a proposal for you.

grinding wheel

Crystec Technology Trading GmbH will be pleased to further discuss details with you.
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