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A diamond grinding wheel wears in what ways?

Views: 201     Author: zhongle     Publish Time: 2023-08-02      Origin: Site


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A diamond grinding wheel wears in what ways?

Following the operation of the diamond grinding wheel, the diamond abrasive surface is dispersed under low grinding force and speed conditions, with many edges reflecting the diamond abrasive's small wear plane. This is because the mechanical wear brought on by the mechanical conflict between the superhard data and the diamond abrasive particles occurs gradually, and the amount of abrasive particle wear is directly inversely proportional to the length of the grinding stroke.

The crystal integrity of diamond abrasives determines the degree of graphitization, and the degree of graphitization is correlated with crystal orientation, according to the properties of diamonds. Good crystal integrity diamond abrasives have little to no graphitization loss.

Some of the diamond abrasive grains on the diamond grinding wheel break and crack, resulting in the whole grain falling off. Crystal cleavage, which is defined as a plane rupture brought on by the type, distribution, and chemical bond of crystal structure element 7, frequently takes place along the directional plane at the end of the strength of the chemical bond.

The irregular grinding process causes the abrasive to rise to a high temperature instantly, cool quickly under the influence of the grinding fluid, and repeat the process numerous times. This creates a significant amount of thermal stress on the abrasive's surface, which causes the surface to crack, as well as fracture wear, defect distribution, and oxidation of the diamond abrasive. Due to the proximity of graphitization, thermal stress first develops at the abrasive crystal's surface flaws, leading to multiple cracks that propagate under the influence of grinding force. As a result, some of the weakest strength of the crushing and falling abrasive is a result of the interaction between grinding force and grinding heat.

Reasonable diamond abrasive and bond selection:

Abrasive particle size selection

The size of the abrasive particles in a diamond grinding wheel has a direct impact on the surface quality and processing power of superhard data grinding. Assuming that the processing quality requirements can be met, the coarser particle size should be chosen as much as possible to improve processing power. Abrasive with a particle size of 120-150# can be used for coarse grinding, abrasive with a particle size of 180-240# can be used for fine grinding, and micro-powder abrasive with a particle size of W40-W7 can be used for superfine grinding.

Abrasive concentration selection

The abrasive concentration in a diamond grinding wheel has a certain influence on the grinding effect of superhard data, too high or too low concentration will cause the premature drop of abrasive, so the grinding wheel loss cost addition test results show that in coarse grinding, a higher concentration can be selected to add the number of useful abrasive particles per unit area, and in improving the processing power + fine grinding, a lower concentration should be selected. Under normal conditions, coarse grinding can be done with an abrasive concentration of 100-150%, and fine grinding can be done with an abrasive concentration of 75-100%.

Choosing a binding agent

Diamond abrasives with intact crystal shapes and a relatively high grinding ratio are suitable for metal bonds with excellent thermal conductivity, such as those found in bronze grinding wheels, which have a stronger binding force on abrasive grains. Due to its poor adhesion to abrasive particles, the resin bond is suitable for diamond abrasives with high brittleness and low strength. The ceramic bond serves a purpose between the aforementioned two. Cast iron short fiber bonds have a binding force of 50–100 kg/mm2 and a tensile strength of 15–30 kg/mm2, which is significantly higher than the function of common metal bonds. The diamond grinding wheel has a grinding ratio that is roughly 4-5 times greater than the resin bond grinding wheel, making it ideal for the production of diamond grinding wheels with unbroken crystal shapes.

Mechanical conflict wear primarily affects diamond abrasive particles when low grinding force and speed are present. The diamond particles oxidize and graphitize when the temperature in the grinding zone is high. The combined effect of grinding force and grinding heat causes the cleavage and crushing of abrasive particles. The whole grains fall off when the mechanical force acting on the grinding grains is greater than the force holding the grinding wheel bond together.

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