Grinding PCD use resin or vitrified bond wheel?

PDC is a composite material formed by sintering diamond powder and carbide substrate under high temperature and high pressure. Its wear ratio generally reaches 130,000 ~ 400,000, and it is extremely difficult to process. When vitrified bonded diamond grinding wheels are converted into 10mm working layer, each wheel can grind about 120 piece PDC , while resin grinding wheel can only grind 100~120 piece PDC.

In addition, vitrified bonded diamond wheelhas the following five advantages over resin bonded diamond wheel in PDC processing:

1）The grinding efficiency of vitrified grinding wheel is 3 times more than resin grinding wheel;

2) the grinding wheel in the whole grinding process, in addition to the first grinding wheel surface edge, no need to repair. Resin grinding wheel must be dressed 7~12 times, otherwise grinding parts will not start;

3）The PDC processed by resin grinding wheel is projected into an isosceles trapezoid, one end of the diamond layer is much larger than the other end of the matrix, and the PDC processed by vitrified grinding wheel is projected into a rectangular shape, the two end faces are the same size, which can be measured at a glance with a square ruler.

Especially when the PDC "runs", the resin grinding wheel can hardly be corrected, so the vitrified grinding wheel will not appear this situation. This is mainly because the resin grinding wheel has a certain elasticity, which may cause a certain yield during grinding. However, the vitrified grinding wheel has a large elastic modulus, good rigidity, high temperature resistance, and will not cause a knife cutting phenomenon during grinding.

4) the workpiece smoothness is better than resin grinding wheel. Because the resin material in the resin grinding wheel is not resistant to high temperature, it is easy to soften at 200℃, causing brittleness and causing edge breakage of the grinding wheel. Therefore, more copper powder is often added in the grinding wheel to dissipate heat, while the copper has great ductility and is easy to adhere to the PDC, making the processed products not bright. And the vitrified grinding wheel out of the product can almost reach the degree of mirror, is expected to rough, finishing a process to complete;

5）A large supply can be used. Resin grinding wheel if the use of a large amount of feed, or grinding wheel grinding parts do not start, or grinding wheel block.

In a word, the vitrified grinding wheel is the most suitable choice for PDC grinding due to its high grinding efficiency, less dressing times, high workpiece size machining accuracy and high finish. However, the problem is that the manufacturing cost of vitrified grinding wheel is higher than that of resin grinding wheel, so the durability of the grinding wheel must be further improved to expand the cost-performance advantage of vitrified grinding wheel in PDC material grinding.

Have any question about grinding pcd,please contact Miss.Anna

Email: Anna.wang@moresuperhard.com,

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