What are the dressing methods of the grinder?

Grinder dressing generally includes turning, diamond roller, grinding and rolling.

① Turning and dressing method: It is a common dressing method to use single-grain diamond (or a diamond pen made of finely crushed diamond, or a diamond dressing block) as a tool to turn the grinding wheel. The diamond tool installed on the tool holder is usually inclined about 5°~15° in the vertical and horizontal directions; the contact point between the diamond and the grinding wheel should be 0.5~2 mm lower than the axis of the grinding wheel, and the diamond should be uniformly advanced at a low speed during dressing. to move. It is required that the smaller the surface roughness after grinding, the lower the feed speed should be. If the surface roughness of Ra0.16-0.04 microns is to be achieved, the dressing feed speed should be lower than 50 mm/min. The total amount of trimming is generally about 0.1 mm on one side, and the trimming is repeated many times. The depth of cut for rough trimming is 0.01-0.03 mm each time, and for fine trimming is less than 0.01 mm.

②Diamond roller dressing method: a diamond roller made by embedding a large number of diamond particles on the surface of a steel roller by means of electroplating or powder metallurgy, and rotates at a certain speed (to reduce the relative speed between the roller and the grinding wheel). Grinding and rolling action is produced, so that the grinding wheel obtains a sharp working surface that matches the profile of the roller. Diamond rollers are complex to manufacture and expensive to manufacture, but they are durable and have high dressing efficiency. They are suitable for dressing and grinding grinding wheels with special shaped surfaces (such as threads, gears, and turbine blade teeth, etc.) in mass production.

③ Grinding and dressing method of grinding wheel: use low-speed rotating superhard silicon carbide grinding wheel to grind against high-speed rotating grinding wheel to achieve the purpose of dressing.

④ Rolling and finishing method: Carbide discs, a set of rollers made of wavy white iron discs or grooved hardened steel sheets are used for dressing with the grinding wheel against rolling and extrusion. The roller is generally installed on the dressing jig and operated manually, the dressing efficiency is high, and it is suitable for dressing the coarse grinding wheel.

During the grinding process, the abrasive grains of the grinding wheel are gradually rounded and blunt under the action of friction and extrusion, or when grinding tough materials, the abrasive debris is often embedded in the pores on the surface of the grinding wheel, making the grinding wheel The surface is clogged, and finally the grinding wheel loses its cutting ability. At this time, slippage will occur between the grinding wheel and the workpiece, which may cause vibration and noise, which will reduce the grinding efficiency and deteriorate the surface roughness. At the same time, due to the increase of grinding force and grinding heat, it will cause work deformation and affect the grinding accuracy. In severe cases, burns and small cracks will appear on the grinding surface. In addition, due to the uneven hardness of the grinding wheel and the different working conditions of the abrasive grains, the working surface of the grinding wheel is worn unevenly, and the amount of abrasive grains falling off in each part varies, resulting in the loss of shape viscosity of the grinding wheel and affecting the shape accuracy and surface roughness of the workpiece surface. Spend.