Device and method for assisting in injecting grinding liquid in grinding wheel airflow field

Abstract

The invention relates to a device and method for assisting in injecting grinding liquid in the grinding wheel airflow field. A spraying nozzle for supplying grinding liquid is arranged on return flow in the airflow field in a wedge-shaped grinding zone and is tangent to the circumference of a grinding wheel; the grinding liquid spraying speed of the spraying nozzle equals the circumferential speed of the grinding wheel; and the energy obtained due to the rapid increase of the speed of the grinding wheel and the pressure and speed of the airflow field in the wedge-shaped grinding zone is used for assisting in the injection of the grinding liquid into the wedge-shaped grinding zone. In the invention, the influence of the air barrier of the grinding wheel can not be generated, and the idle work energy of a grinding liquid supplying system is saved. The spraying nozzle for supplying the grinding liquids tangent to the circumference of the grinding wheel, and the grinding liquid spraying speed of the spraying nozzle equals the circumferential speed of the grinding wheel, thus the grinding liquid can be more effectively injected into the wedge-shaped grinding zone under the drag of the grinding wheel. Because the dynamic pressure and speed of the grinding wheel airflow field increase greatly in the wedge-shaped grinding zone, more power and energy can be obtained for the grinding liquid in the wedge-shaped grinding zone. Because the negative pressure is formed behind the minimum clearance of wedge-shaped grinding zone, the flow rate of the grinding liquid flowing through the grinding wheel and a workpiece interface is increased.

Description

technical field [0001] The invention belongs to a method for supplying grinding fluid in mechanical processing, namely a method and a device for assisting injection of grinding fluid by a grinding wheel air field. Background technique [0002] In grinding, the energy consumed per unit volume of material is much greater than other cutting methods, and a large amount of heat is generated in the grinding area, which is dissipated on chips, tools and workpieces. The thermal effect of grinding has a great influence on the surface quality and performance of the workpiece. Especially when the temperature exceeds a certain critical value on the grinding wheel / workpiece interface, it will cause surface thermal damage (oxidation, burns, residual tensile stress and cracks on the surface), which will result in reduced wear resistance of the parts. The anti-fatigue performance is deteriorated, thereby reducing the service life of the parts and the reliability of the workpiece. In addit...

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Problems solved by technology

Since the high-pressure jet can easily break through the barrier of the formed vapor film and ensure the continuous contact between the grinding fluid and the surface of the workpiece, it is possible to break through the barrier of film boiling and reduce the temperature of the grinding arc zone. This cooling fluid injection method is not suitable. Affected by the gas barrier of the grinding wheel, the heat transfer efficiency is high, but the disadvantage is that the grinding wheel is prone to vibration during operation, resulting in reduced precision and surface quality of the workpiece, and the liquid supply system has a complex structure and high cost

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