What abrasives are used to produce resin polishing block?
Resin polishing blocks are also called resin grinding blocks, resin grinding stones and resin abrasives, etc.
Resin polishing blocks are mainly composed of resin binders and abrasives, among which abrasives directly determine the grinding performance. According to the application scenarios and processing requirements, the commonly used abrasive types include the following categories:
1.Ordinary abrasives
Aluminum oxide (white aluminum oxide/brown aluminum oxide)
White aluminum oxide/brown aluminum oxide: high hardness and good toughness, suitable for rough grinding and surface cleaning of steel and castings.
Application scenarios: grinding of steel ingots and steel plates in the steel industry, and cleaning of burrs on castings.
Black carborundum/green carborundum: higher hardness than aluminum oxide, more brittle, suitable for fine grinding and polishing of non-metallic materials such as stone, ceramics, and glass.
Features: strong cutting force, but light-colored stone is easy to color and the cost is high.
2.Superhard abrasives
Diamond
Synthetic diamond powder: The hardest and the best wear resistance, mainly used for efficient fine grinding and polishing of hard and brittle materials (such as stone and ceramics).
Advantages: Long life, high grinding efficiency, and adaptable to the elastic requirements of resin binders.
Cubic boron nitride (CBN)
Suitable for precision machining of ferrous metals (such as cemented carbide), with good high temperature stability, but high cost.
3.Special composite abrasives
Mixed abrasives: Such as aluminum oxide and silicon carbide composite, taking into account toughness and sharpness, used for the transition process from medium coarse grinding to fine grinding.
Polishing abrasives (such as cerium oxide): Used in resin polishing paste to achieve high-gloss surface.
4.Key parameters for abrasive selection
Grit size: 40-100 mesh for coarse grinding, F and JIS series micropowder (F230-F2000,JIS#240-JIS#8000) for fine grinding.
Shape: Angular abrasives have strong cutting force, and spherical abrasives are suitable for polishing.
Concentration: Abrasives account for 20%-60%, affecting cutting efficiency and surface quality.
Summary
The core abrasive of the resin polishing block needs to be comprehensively selected based on the hardness of the processed material (metal/non-metal), the process stage (rough grinding/fine grinding/polishing) and the cost:
Metal rough grinding: aluminum oxide (white aluminum oxide/brown aluminum oxide);
Stone fine grinding: silicon carbide or diamond;
High-precision polishing: diamond micropowder or composite abrasive.
Note: The ratio of abrasive to resin and the curing process (such as phenolic resin modification) also directly affect the wear resistance and elasticity of the resin polishing block.