Features Of Diamond Grinding Wheel Grinding

The diamond grinding wheel is a porous body made by adding a binder to the abrasive, compacting, drying and calcining. The diamond grinding wheel uses diamond abrasive as raw material, and uses metal powder, resin powder, ceramics and electroplated metal as binders respectively. The circular bonded abrasive tool with a through hole in the center is called diamond grinding wheel (alloy grinding wheel). Due to the different abrasives, binders and manufacturing processes, the characteristics of grinding wheels vary greatly, so they have an important impact on the processing quality, productivity and economy of grinding. The characteristics of the grinding wheel are mainly determined by factors such as abrasive, strength, bonding agent, hardness, structure, shape and size.

According to the abrasive used, it can be divided into ordinary abrasive (corundum and silicon carbide whisker (silicon), etc.) grinding wheel and natural abrasive superhard abrasive and (diamond and cubic boron nitride, etc.) grinding wheel; according to shape can be divided into flat grinding wheel, bevel grinding wheel , cylindrical grinding wheel, cup-shaped grinding wheel, dish-shaped grinding wheel, etc.; according to the binder, it can be divided into ceramic grinding wheel, resin grinding wheel, rubber grinding wheel, metal grinding wheel, etc. The diamond grinding wheel uses diamond abrasive as raw material, and uses metal powder, resin powder, ceramics and electroplated metal as binders respectively. The circular bonded abrasive tool with a through hole in the center is called diamond grinding wheel (alloy grinding wheel).

Diamond Grinding Wheel The hardness of the diamond abrasive determines the main characteristics of the diamond grinding wheel, which can efficiently grind hard alloys, glass, ceramics and other difficult-to-machine materials, and the grinding tools have the longest service life. The characteristic parameters of the grinding wheel mainly include abrasive, viscosity, hardness, binder, shape, size, etc.

Since the grinding wheel usually works at high speed, a rotation test (to ensure that the grinding wheel will not break at the highest working speed) and a static balance test (to prevent vibration of the machine tool during operation) should be carried out before use. Grinding wheels should be reconditioned to restore grinding performance and correct geometry after a period of operation.

The characteristics of the grinding wheel used on the grinding machine are: due to severe friction, the temperature of the grinding zone is very high. This will cause stress and deformation of the workpiece, and even cause burns on the surface of the workpiece. Therefore, a large amount of antifreeze coolant must be injected during grinding to reduce the grinding temperature. Coolant also acts as chip evacuation and lubrication.

The radial force during grinding is large. This results in an elastic concession of the machine-wheel-workpiece system, making the actual depth of cut less than the nominal depth of cut. Therefore, when the grinding is about to be completed, the smooth grinding should be carried out without feeding to eliminate the error. After the abrasive grains are blunt, the grinding force also increases, causing the abrasive grains to break or fall off, and the sharp edge is re-exposed. This characteristic is called self-sharpening. However, after a certain working time, manual dressing should be carried out to avoid vibration, noise and damage to the surface quality of the workpiece caused by the increase in grinding force.

Since the abrasive grains of the grinding wheel have high hardness and heat resistance, grinding can process materials with high hardness, such as hardened steel and cemented carbide. The characteristics of the grinding wheel and the grinding machine determine that the grinding process system can perform uniform micro-cutting, generally ap=0.001～0.005mm; the grinding speed is very high, generally up to v=30～50m/s; the grinding machine has good rigidity; Therefore, grinding can economically obtain high machining accuracy (IT6 ~ IT5) and small surface roughness (Ra = 0.8 ~ 0.2m). Grinding is one of the main methods of finishing parts.