Double face grinding means that two end faces of the workpiece are ground simultaneously with two oppositely mounted grinding wheels.It is mainly used for grinding two end faces of discs, sleeve parts or sheet parts, and it is one of the most effective methods for finishing flat end faces. Double face grinding wheel is widely used in grinding hydraulic and pneumatic components, hydraulic motor components, automotive steering pump parts, refrigeration compressor parts, oil pump nozzle parts, engine parts, high-precision bearings, seals, piston rings, cutting tools, molds, meters, carbide blades, ceramic valve cores and magnetic materials, etc. Glory Diamond Tools could offer diamond wheel, like 6A2B grinding wheel.
Unlike conventional grinding methods, double-face grinding relies on large areas of contact between the workpiece and the double face grinding wheel to remove the workpiece material at relatively low cutting speeds. Compared with single-end grinding, the surface to be machined is the positioning surface when the end surface of the workpiece is ground with double face grinding. This will avoid the superposition of positioning error and machining error. After the workpiece is processed, high flatness and parallelism of the two planes can be obtained. In addition, the double-face grinding greatly reduces the auxiliary time and maneuvering time by combining the processing steps of the two end faces of the workpiece into one step. Automatic measuring, automatic loading and unloading can realize full automation and efficient production, reduce labor intensity and save costs. Compared with the plane grinding, in the double-end precision grinding process, the micro-slip, the micro-ploughing, the micro-cutting and the micro-fatigue fracture of the material simultaneously act, and the wear marks are evenly crossed, which can ensure high grinding rate and the processing precision of the workpiece at the same time. In addition, with advantages of high degree of automation, low cost and low environmental pollution, double face grinding has become the main finishing method for parts, such as disk substrates and monocrystalline silicon wafers. However, as for actual production applications, due to the surface contact between the grinding wheel and the workpiece during double-face grinding process, the contact area is large, which will cause rapid passivation of the grinding wheel, the clogging of the air hole and the grinding burn. Besides, the driving power of the machine tool is high. The noise is large during grinding process, which inhibits the application of double-face grinding technology to a certain extent.
The process of double face grinding is the process of squeezing, sliding, ploughing and abrasive dust separation on the surface of the workpiece. Due to the large grinding area, the double face grinding wheel process is accompanied by friction caused by a large amount of abrasive grains against the surface of the workpiece. And the frictional resistance generated is large, so the heat generated by the friction is also large. And local high temperature is easily generated at the place where the abrasive dust gathers, which will make the local metal structure of the workpiece surface annealed and contracted to form a concave shape and cause surface grinding burn. Therefore, the choice of grinding wheel is very important. First of all, the hardness of the grinding wheel should be appropriate. Secondly, the grinding wheel should have good chip removal performance.