How to dress the diamond wheels?

Diamond grinding wheels are divided into electroplated diamond grinding wheels, ceramic diamond grinding wheels, resin diamond grinding wheels and sintered diamond grinding wheels. Electroplated diamond grinding wheels are evenly coated with a layer of diamond abrasive grains on a steel substrate. After electroplating processing, they generally do not need to be trimmed. The bond of the ceramic diamond grinding wheel is brittle and there are gaps in the grinding wheel, so the dressing method is similar to that of ordinary grinding wheels. The structure of resin diamond grinding wheels is similar to that of sintered diamond grinding wheels, and the bond texture is dense. Therefore, the dressing process is different from ordinary grinding wheels. Dressing must be divided into two processes: shaping and sharpening.

Shaping is to establish the coaxiality and geometry of the grinding wheel to achieve the required geometric accuracy of the grinding wheel. After shaping, it cannot be ground normally and must be sharpened, that is, the bonding agent between the grinding grains of the grinding wheel is cleaned, and the metal removal rate of the grinding wheel is improved to achieve the grinding capacity of the grinding wheel.

1. Dressing resin bonded diamond grinding wheel by grinding oilstone method

The grinding oilstone method is a very simple method for dressing diamond grinding wheels. Tests have shown that silicon carbide oilstones of different sizes can be used to dress diamond grinding wheels. The protrusion of the abrasive grains is about 0.01-0.o2mm. When the particle size changes, it has little effect on the dressing effect. In addition, when dressing the diamond grinding wheel using this method, increasing the depth of cut will not achieve a good dressing effect. On the contrary, it will increase the grinding force, cause the abrasive grains to break, and make the surface busbar of the diamond grinding wheel uneven. The disadvantage of the grinding oilstone method is that it cannot form enough chip-holding space for the diamond grinding wheel, so it cannot meet the requirements of large cutting volume.

2.WA grinding method for dressing resin bonded diamond grinding wheels

The counter-grinding method is very effective for dressing resin-bonded diamond grinding wheels. This method is easy to implement on a cylindrical grinder, but it is troublesome to install an additional power head on a surface grinder to drive the corundum grinding wheel. Dressing the diamond grinding wheel is divided into two processes. The first process is to use a shaping wheel to shape the diamond grinding wheel. The second process is to use a dressing wheel to sharpen the diamond grinding wheel. The grinding wheel surface roughness R is usually used to evaluate the dressing effect. Factors that affect R include: sharpening wheel abrasive, particle size, sharpening parameter (VrVf), sharpening time t and grinding fluid, etc.

3.Dressing block assisted dressing resin bonded diamond grinding wheel

The trimming block usually uses a metal molybdenum block. Use flat-nose pliers to clamp the molybdenum block and place it on the workbench to magnetize. Next, set the grinding parameters as usual for grinding the plane: grinding allowance 0.4, feed per stroke 0.01, grinding wheel linear speed 23M/S. After the program ends, use a dial indicator to check the runout of the grinding wheel. If there is still runout, add an appropriate grinding allowance of 0.2, and grind back and forth again until the runout is guaranteed to be within 0.003. Then you can remove the grinding wheel and do it. static equilibrium. After static balancing is completed, and then trimmed by about 0.05, the grinding wheel can be used for grinding.

4. Diamond roller dressing ceramic bond diamond grinding wheel

There are two methods for dressing ceramic bonded diamond grinding wheels, one is the plunge forming method and the other is the profiling generation method. The working principle of the plunge forming method is to produce the required grinding wheel shape by cutting an electroplated diamond dressing wheel whose shape is completely opposite to the required grinding wheel shape into the grinding wheel. The working principle of profile generation is to use computer numerical control to guide the dressed grinding wheel over the diamond roller to produce the required grinding wheel shape. As the manufacturing technology of diamond rollers becomes increasingly mature, diamond pens are gradually being replaced for dressing diamond grinding wheels.

Diamond grinding wheels play an unparalleled role in improving grinding productivity and efficiency in mechanical processing. In the early days, they were limited due to their difficulty in dressing. But now, with the maturity of the diamond roller manufacturing process, the dressing of diamond grinding wheels is no longer a problem and is widely used in various grinding processes.