1 Problems of Grinding Cemented Carbide in Grinding Steel cemented carbide is prepared by using tool steel or alloy steel as the binder phase and refractory metal carbides (mainly WC, TiC) as the hard phase by powder metallurgy. Its microstructure is characterized by fine and hard materials. The phase grains are dispersedly distributed in the steel base. The hard phase in the alloy mainly gives the material high hardness and high wear resistance, and the binder phase gives the material the properties of the steel, so that the steel-bonded hard alloy has the comprehensive properties of steel and hard alloy, making it Has been widely used in the field. However, its own processing and manufacturing is very difficult, especially the precision machining, because the hardness of the hard phase and the binder phase are relatively different, the steel base is easily removed, and the hard spots are not easy to be removed, and the crystal grains are easy. Peel off from the surface of the alloy to form pores of the same size as the hard phase grains on the surface. At the same time, the toughness of the steel base is large. Under certain conditions of grinding temperature, contact pressure and relative speed, the swarf fills the pores between the abrasive particles, which causes the grinding wheel to rapidly block the surface of the workpiece and cause burns. Therefore, the traditional processing method is difficult to obtain. Low surface roughness, low multi-stage grinding efficiency, and high cost. 2 Basic Principles of ELID Grinding Technology On-line electrolytic dressing mirror polishing is a new ultra-precision processing technology developed in Japan in the early 1990s. It uses cast iron or iron fiber binder diamond or CBN grinding wheel to utilize the anode dissolution phenomenon in the electrolysis process to perform grinding on wheels. On-line electrolytic dressing grinding, electrolytic power using DC pulse power, electrolyte electrolyte solution using a weak electrolyte. The cast iron grinding wheel is an anode. During the electrolysis, the iron element on the surface of the grinding wheel becomes an Fe2O3 oxide film, so that the non-electrolytic diamond or CBN abrasive material protrudes from the surface of the grinding wheel. The blunt abrasive material falls off in time with the electrolysis, making the grinding wheel always in a sharp state. The oxide film produced at the same time plays the role of inhibiting the electrolysis process from continuing, so that the loss of the grinding wheel is not too fast. When the abrasive grain on the surface of the grinding wheel is worn, the oxide film is scraped and removed by the surface of the workpiece, the electrolysis process is continued, and the surface of the grinding wheel is further repaired. This is a cyclical process, which not only avoids the excessive loss of the grinding wheel, but also automatically maintains the grinding state of the grinding wheel surface [1–3]. See the figure below. ELID grinding schematic 3 Application of ELID Grinding Technology to Steel-bonded Cemented Carbide 3.1 Test Conditions <br> Test Equipment, Test Parameters See Table 1, Table 2 Table 1 Test Equipment Table 2 Test parameters 4 Conclusion Using ELID precision mirror grinding technology for precision machining of steel bonded carbide, a mirror surface with a surface roughness of the order of 10 nm can be obtained, this method can replace the traditional multi-stage grinding progressive refining process, with a grinding process , high efficiency, good surface quality, etc., is an advanced process with promising development. Cutting And Sewing Machine,Full Automatic Cutting Sewing Machine,Cold Cutting And Sewing Machine,Automatic Cold Cutting And Sewing Machine Zhejiang Sanlong Universal Machinery Co.,Ltd. , https://www.sanlongmachinery.com
Keywords: steel bonded carbide; ELID grinding; Precision Mirror Surface Grinding; base metal grinding wheel <br> DOI: TG580.613; TG743 Document code: A
Article ID: 1004-132X(2000)03-0288-02
The use of an on-line electrolytic continuous-repair (ELID) metal bond ultra-fine grain diamond wheel for grinding steel-bonded carbide has a surface roughness of about 10 nm and high efficiency. This test uses ELID mirror grinding technology for precision machining of steel bonded carbide, it is easy to get low-roughness mirror. 
3.2 Grinding effect and analysis <br> Under the above conditions, the steel cemented carbide is mirror-polished, and the surface roughness of the workpiece is Ra=0.003 μm to 0.011 μm. If a finer grinding wheel (W1 or more) is used, the Ra value will be significantly reduced and better surface roughness will be achieved.
Analyzing the grinding effect, we found that the surface roughness of the workpiece is not only closely related to the grain size and type of the abrasive used, but also closely related to the ratio of the grinding fluid. The grinding fluid with different compositions and contents, its chemistry The characteristics vary widely and the surface roughness produced is different. Using HDMY-110 and HDMY-200 grinding fluids, we processed specimens of mirror-finished optical glass, sapphire, hardened steel, hard alloy, cermet, PCBN, and monocrystalline silicon wafers. But for the steel bonded carbide, it can not be processed. 
The mirror of 13 was changed to special grinding liquid HDMY-201 and diamond, CBN mixed abrasive iron-based grinding wheel, and polished to reach the mirror surface under the same conditions. 14) Steel bonded carbide. This is mainly because the composition and content of the grinding fluid have a great influence on the electrolysis speed, the film formation speed, the film thickness, the hardness of the film, and the structure and properties of the workpiece surface being processed. According to the difference of the materials to be processed, the composition and ratio in the grinding fluid can be properly adjusted, and the type and particle size of the iron-based grinding wheel can be obtained. The best grinding state can be obtained, so that a lower Ra value can be obtained and precision machining can be achieved. The request.
Abstract : An on-line electrolytic dressing technique for precision mirror grinding of metal-based superabrasive grinding wheels was introduced. The steel mirror cemented carbide was precision mirror-finished to obtain a mirror surface with a roughness of 0.003 μm to 0.011 μm. Shaping forming, high efficiency, can replace the current multi-level grinding process.