The cause of cutter back-off in grinding PCD tool arc with diamond grinding wheel：
（1）The grinding wheel is not sharp enough to reach the set grinding amount.
（2）Use a finer-grained grinding wheel, such as 1500#.
（3）Re-set the grinding parameters. Different parameters should be used when grinding the inserts back and arc.

Imported resin diamond grinding wheel has been used in ceramic artificial joint grinding, but there are some problems in the grinding process, such as workpiece burn, grinding immobility, poor surface accuracy, etc. The grinding of artificial joint head is carried out by installing ceramic diamond grinding wheel on ultra-precision grinding machine.

Grinding wheel hardness is an important index to measure the "self-sharpening" of grinding wheel.

In the grinding process, the abrasive gradually becomes blunt and sharp, and the partially passivated abrasive continues to work, and the pressure on the abrasive will continue to increase. When the pressure is high to a certain value, some abrasive grains will be broken and form a new edge. When the pressure exceeds the bonding force of the binder, the abrasive particles will be self-detached. The property that the passivated abrasive grains will collapse or fall off themselves, keeping the wheel sharp, is called "self-sharpness". The hardness of grinding wheel reflects the degree of difficulty that the abrasive particles fall off from the surface of grinding wheel under the action of grinding force. The grinding wheel is hard, that is, the abrasive particles are difficult to fall off; If the grinding wheel is soft, the abrasive grains fall off easily.

In the use of CBN grinding wheel, when the wear of grinding wheel width direction exceeds 80% of the total width of grinding wheel, the grinding wheel should be dressed. The dressing amount of grinding wheel is generally 0.01mm/ time, so the dressing method can be adopted by stages. CBN grinding wheel dressing mainly includes shaping and sharpening. The so-called shaping means that the grinding wheel keeps its original precision and geometric shape through dressing. The so-called sharpening refers to removing the binding agent contained in the grinding wheel grains, so that the grains have a certain height difference, so as to form a cutting surface, so as to facilitate bearing grinding.

DDG(Double Disc Grinding) machine mainly uses the high speed rotation of grinding wheel to grind the surface of the workpiece to achieve the accuracy. The working principle of different double disc grinding machine is also different.
1. Horizontal spindle double disc grinding machine with rectangular table: Use grinding wheel for peripheral grinding. The worktable reciprocates longitudinally, the grinding wheel rotates vertically, and the lateral feed is realized by the grinding wheel or the worktable.
2. Horizontal spindle double disc grinding machine with round table: Use the grinding wheel for peripheral grinding, the table is associated with rotary motion, and the rest of the working motion is realized by the grinding wheel.
3. Vertical spindle double disc grinding machine with rectangular table: The end face of the grinding wheel is used for grinding, and the table moves longitudinally and reciprocally. The grinding wheel with large diameter also moves vertically in addition to rotation.
4. Vertical spindle double disc grinding machine with round table: Also uses the end face of grinding wheel for grinding. Besides continuous rotation of the round table, it can also realize longitudinal reciprocating motion. The grinding wheel should move vertically in addition to rotation.

Ballast track is concrete or asphalt mortar to replace loose ballast and composed of track structure type, it has the characteristics of high track stability, good stiffness uniformity, strong structure durability and less maintenance work, for high-speed railway has a better adaptability than the traditional ballast track. Of slab without a frantic jumble track research in China is carried out along with the continuously go deep into the research of high speed railway, high-speed railway track plate is no ordinary concrete products, because of the complexity of the track plate used in concrete and the track plate size is relatively strict, must ensure that the support rail grinding machine precision steel erection error is less than 0.3 mm, Therefore, high requirements are put forward for the tool manufacturing industry.