Method of Grinding Wheel Dressing
SOURCE：This station Author：admin Time2023-07-18 Page View：548次
During the grinding process, the abrasive particles of the grinding wheel gradually become rounded and blunt under the action of friction and compression, or when grinding ductile materials, the abrasive debris is often embedded in the pores on the surface of the grinding wheel, causing the surface of the grinding wheel to block, and ultimately causing the grinding wheel to lose its cutting ability. At this point, there may be slipping between the grinding wheel and the workpiece, which may cause vibration and noise, leading to a decrease in grinding efficiency and a decrease in surface roughness. At the same time, the increase in grinding force and heat can cause work deformation and affect grinding accuracy, and in severe cases, it can also cause burns and small cracks on the grinding surface. In addition, due to the uneven hardness of the grinding wheel and the different working conditions of the abrasive particles, the wear on the working surface of the grinding wheel is uneven, and the amount of abrasive particles falling off in various parts varies, resulting in the loss of external viscosity of the grinding wheel and affecting the shape accuracy and surface roughness of the workpiece surface.
Grinding wheel dressing method:
Grinding wheel dressing generally involves methods such as turning, using diamond rollers, grinding, and rolling Turning and dressing method: The most commonly used dressing method is to use a single particle diamond (or diamond pen or diamond dressing block made of fine diamond) as a tool to turn the grinding wheel (Figure 1). The diamond cutting tools installed on the tool holder usually tilt about 5 ° to 15 ° in both vertical and horizontal directions; The contact point between the diamond and the grinding wheel should be 0.5~2 millimeters lower than the axis of the grinding wheel. When dressing, the diamond should be evenly fed and moved at a low speed. The smaller the surface roughness after grinding, the lower the feed rate should be. To achieve a surface roughness of Ra0.16-0.04 micrometers, the dressing feed rate should be less than 50 millimeters per minute. The total amount of trimming is generally around 0.1 millimeters on a single surface, and the trimming is repeated repeatedly. The cutting depth for rough trimming is 0.01-0.03 millimeters each time, while for fine trimming, it is less than 0.01 millimeters Diamond roller dressing method: A diamond roller (Figure 2) is made by using electroplating or powder metallurgy methods to embed a large number of diamond particles on the surface of a steel roller. It rotates at a certain speed (to reduce the relative speed between the roller and the grinding wheel), generating grinding and rolling effects on the surface of the high-speed rotating grinding wheel, allowing the grinding wheel to obtain a sharp working surface that matches the surface of the roller. Diamond roller manufacturing is complex and costly, but it is durable and has high dressing efficiency. It is suitable for dressing and grinding grinding grinding wheels with special shaped surfaces such as threads, gears, and turbine blade tenons in mass production Grinding wheel grinding and dressing method: Using a low-speed rotating superhard silicon carbide grinding wheel and a high-speed rotating grinding wheel to achieve the purpose of dressing Rolling and dressing method: using hard alloy discs, a set of rollers composed of wavy white iron discs or hardened steel plates with grooves, and grinding wheels for rolling and pressing for dressing. The roller is usually manually operated on the trimming fixture, which has high trimming efficiency and is suitable for the trimming of coarse grinding wheels.
