Tungsten Carbide Ball Eccentric Arc Slot Grinding (2/2)

Before the grinding, according to the specifications of tungsten carbide ball to be ground, using the tool for forming the eccentric circular groove finishing, precision controlled within ± 0.01, which effectively ensure the good agreement between the ball and the grinding groove. Overall, the process can be divided into coarse grinding balls, semi-fine grinding, grinding, coarsely ground, semi-lapping, lapping, fine grind, polish eight processes. Before the beginning of each process must be thoroughly clean the device and select the appropriate size of the grinding tray. Generally, grinding compound is oil based boron carbide (BC), the granularity is about 180#, which effectively ensure the precision and efficiency of tungsten carbide ball, the sphericity is better than 0.6μm, the average rate of grinding can reach 20 μm/h.

In addition, after grinding to measure tungsten carbide ball, which the precision is related to the methods of measurement, the choice of measuring apparatus, the quality of ball surface, the fineness or cleanliness of ball surface, humiture of the conditions and many factors. After coarsely ground and semi-lapping should be used to measure microscopic micrometer, and take at least 20 points in the space above the whole sphere, ball measurement accuracy can be controlled within the 2μm. It should be used after lapping and polishing processes high-precision roundness measurement, measurement accuracy (0.04 + 6H / 1000μm, H refers to measuring height). Each batch of carbide spheres need to be tested with alcohol wipe, and left more than 4 hours in a constant temperature environment 25 ℃, the temperature and the sphere to be measured ambient temperature measurements can be carried out after leveling. Three cross-sectional scans every single space sphere has mutually perpendicular, each circular cross-section values are less than 1μm, sphericity this sphere can be considered qualified, sphericity value should be the average of measurements taken.