Grinding Disc

As the core tool for surface treatment, the classification system of grinding discs forms differentiated designs based on the matrix structure, abrasive ratio and processing characteristics. Unlike ordinary grinding wheels, grinding discs generally adopt a multi-layer composite structure, with the center hole diameter standardized to 22.23mm (7/8 inches) to adapt to angle grinders, and the edge thickness is 15%-20% thinner than the center area to improve grinding stability.

According to the matrix material, resin fiber reinforced grinding discs dominate the market, using phenolic resin impregnated glass fiber mesh, with alumina or zirconium corundum abrasives, suitable for steel structure weld grinding, with a particle size range of 24-120 mesh; metal-based grinding discs use aluminum alloy as the skeleton, with diamond or CBN abrasives electroplated on the surface, specially used for stone mirror polishing, and the cutting line speed can reach 35m/s. Ceramic-based grinding discs are mostly used for the finishing of titanium alloy parts in aerospace, and the porosity is controlled at 25%-30% to improve heat dissipation efficiency.

Structural innovation promotes professional development: The bowl-shaped grinding disc (Type 12) has a 25° tilted working surface design, which increases the contact area by 40% and is widely used for roughening concrete surfaces; the grinding disc with an elastic buffer layer can reduce 80% of the vibration marks in automobile sheet metal repair. The anti-blocking grinding disc adopts a wavy abrasive arrangement, combined with aluminum oxide filler, which can effectively avoid surface adhesion when grinding soft metals.

Application scenario segmentation has spawned special categories: marine stainless steel grinding uses cobalt-containing abrasive grinding discs, which increase the salt spray corrosion resistance life by 3 times; the sand-planting grinding discs used in the woodworking industry use electrostatic sand-planting technology to arrange the abrasive particles in a directional manner to evenly distribute the cutting force. Industry standards EN 12413 and ISO 603 strictly limit the breakage speed and imbalance of grinding discs. High-end products use laser dynamic balancing correction to control the eccentricity within 0.5g·mm. The current trend focuses on the development of smart grinding discs. Some models are embedded with wear sensors and transmit the remaining service life data in real time via Bluetooth.