The Difficult Problem And Its Countermeasures Of High Efficiency Grinding

The difficult (bottleneck) problem of high efficiency grinding is high grinding temperature and burn which impose restriction on useful of high grinding in hard cutting materials. On the basis of the study on the mechanism of heat transfer in the grinding contact zone, two basic countenneasures are advanced to solve the difficult problem and further develop the potentiality of high efficiency grinding. One is increasing the sharpness of the grinding wheel for decreasing the specific grinding energy so as to reducing grinding heat as fully as possible. The other is the intensified cooling technology of radial and directional jet impingement in the grinding zone to steadily control the temperature of work-piece surface at extremely low lever under the heat flux far exceeds the critical value, put the heat scattered as fully as possible. Bases on the two creative countenneasures, following creative works in this paper are carried out1. On the basis study of the mechanism of heat transfer in the grinding contact zone, an creative conception is set up to exploit the potentialities of high efficiency grinding to great extent through enhancing heat transfer of the grinding zone, and according to this conception, an unique method is conceived and designed to intensify the cooling of the work-piece surface in the contact zone through high-pressure radial jet impinging.2. A new grinding fluid provided equipment is put forward to enhance heat transfer of the grinding zone by the high-pressure jet impingement. The structure of the experimental device is designed ingeniously. It successfully solves the difficult problems of rotational mechanical sealing and leak when the high-pressure grinding fluid is pumped into the grinding wheel parts which rotates at high speed, and restricting high-pressure grinding fluid radial and directional impingement to the work-piece surface in the contact zone. Maker the equipment further improvement and perfect, let it can be sues widespread in industries.3. On the basis study of the insufficient of traditional multiplayer and electroplating grinding wheel, study the technology superiority and specific property of green manufacturing. Analyses the presentsituation and main technology problem of brazing grinding wheel in the world. A new creative idea of researching and producing high quality starting brazing grinding wheel than other country is put forward.4. Study the bases theory of high temperature brazing and thermodynamic theory of interface element diffusion and chemical bond as well as infiltration of abrasive and brazing material-, steel base, study composition of brazing material > film of abrasive and technology . It can explore a series method and regular for finishing high strength chemical and metallurgical bond of abrasive ? brazing material and steel base at last.5. Design the experimental scheme of brazing diamond grinding wheel with Ag-Cu alloy and Ni-Cr alloy. The high temperature brazing of diamond grits under the condition of laboratory has met success with the two types of braze alloys. Ni-Cr alloys are mainly suitable the brazing of high efficiency grinding wheels and Ag-Cu alloys are mainly suitable the brazing of ordinary grinding wheels.6. The micro-region of the interfacial section between brazing alloy and diamond has been measured and analyzed by SEM-EDS and SEM-WDS as well as X-ray diffraction. It fist revealed that there exits chemical and metallurgical bond, and the structural types of interface carbide between brazing alloy and diamond particles has also been found out firstly.7. On the basis of studying the brazing of CBN, research and produce Ag-Cu-Ti alloy which can infiltrate CBN firstly in china, and make experiment studying ; the result show Ag-Cu-Ti alloy has high quality infiltration to CBN , Interfacial section have formed chemical and metallurgical bond between CBN and Ag-Cu-Ti.8. On the bases of a series experiment, a high sharp diamond grinding wheel has been developed ; it reached chemical and metallurgical bond of abra...