Silicon wafer back grinding is generally divided into two steps: rough grinding and fine grinding.
In the rough grinding stage, the diamond wheel with grit 46 # ~ 500 # , the axial feed speed is 100 ~ 500mm/min, and the grinding depth is generally 0.5 ~ 1mm.
The aim is to quickly remove most of the excess material (90% of the processing allowance) from the back of the silicon wafer.
In the process of fine grinding, the machining allowance is from several microns to more than ten microns. The diamond grinding wheel with grit 2000 # ~ 4000 #, and the axial feeding speed is 0.5 ~ 10mm/min.
It is mainly to eliminate the damage layer formed during rough grinding to reach the required thickness. In the fine grinding stage, the material is removed by ductility domain mode, and the surface damage of silicon wafer is significantly reduced.

CIOE 2021 (The 23rd China International Optoelectronic Exposition), as the world’s leading optoelectronic exhibition, will be held at Shenzhen World Exhibition & Convention Center on September 16-18, 2021. The exhibition focuses on precision optics,chip materials,infrared materials and components and other fields.
More than 3,200 optoelectronic exhibitors will present the entire optoelectronic ecosystem including information and communication, precision optics, sensing, lasers, infrared and photonics.

The first Formnext + PM South China will be held in Shenzhen on September 9-11, 2021. 
EXPO will cover a series of advanced materials, technologies, equipment and products such as materials, powder metallurgy, additive manufacturing and post-processing, bringing new business opportunities to the manufacturing industry in China and even Asia.
Moresuperhard will participate in Formnext + PM South China.​

PCD tool must ensure good cutting edge before machining workpiece. Diamond grinding wheel is the most widely used method. The higher the quality of the cutting edge, the finer the tool mark left at the junction of the geometric reflection region of the workpiece surface, and the higher the surface finish of the workpiece. Because cutting edge collapse or expansion easily cause tool wear or damage, reduce tool life. Edge collapse is a key index of edge quality of diamond tools.

The grain size of diamond grinding wheel should be one point coarser than that of the dressing grinding wheel, and the size of diamond particles should be close to the same, and the shape of diamond particles is approximately spherical. The commonly used particle size is 36# ~100#.

Peripheral Diamond Grinding wheels are used for indexable inserts grinding. Peripheral Diamond Grinding wheels for indexable inserts, must be of a high level of geometrical accuracy, with ability of significant material removal.
Grinding wheel size: D400*W12*X6, W20
Grinding inserts：CBN, SNGA two-edge
Equipment: HI-powerful Peripheral grinding machine HP400 PLUS