The polishing sheet will be damaged to varying degrees during use, so it is not easy to detect. The reason why the polishing sheet is easy to fall off is related to the hardness of the polishing sheet. The hardness of the polishing sheet refers to polishing. The degree of difficulty of the abrasive grains on the surface of the sheet falling off from the bonding agent under the action of the cutting force. If the abrasive particles are easy to fall off, the hardness of the abrasive article is low; otherwise, the hardness is high.
The general principle of hardness selection of polishing sheet is: to grind hard material, soft-grinding disc should be selected to maintain good self-sharpness, improve the service life of high performance cutting disc, reduce grinding force and grinding heat; When softening the material, the hard grinding wheel should be used, which can keep the sharp edge of the abrasive grain sharper for a long time, which is good for cutting. The details are as follows:
1. When grinding toughness, such as non-ferrous metal workpieces, high-hardness cutting tools, grinding thin-walled parts and materials that have blocked the grinding discs, softer grinding discs should be used; super-soft grinding discs should be selected for mirror grinding.
2, the workpiece material is the same, longitudinal grinding and plunge grinding, peripheral grinding and end grinding, cylindrical grinding and inner circle, plane grinding, wet grinding in dry grinding, fine grinding in rough grinding, intermittent surface grinding Cutting and continuous surface grinding, etc., the former must use a harder than the latter.
3, high-speed, high-precision grinding, steel blank grinding, workpiece deburring, etc., should choose a harder grinding.
Generally speaking, it is required to have high efficiency, large surface roughness value, the large contact surface between the low price disc for metal and the workpiece, or grinding of the workpiece to the level of the workpiece, high toughness of the workpiece material, large elongation and processing of thin-walled workpieces. Some granularity; conversely, processing materials with high hardness, brittleness, and tight structure; when grinding, forming, or high-speed grinding, choose a smaller particle size.
What types of commonly used abrasives are available?
Abrasives are widely used in industry, especially when machining high-precision or low-roughness parts or particularly hard parts. Abrasives and abrasive tools are indispensable. In actual production, the commonly used abrasives are artificial emery, silicon carbide, Corundum, diatomaceous earth, quartz sand, and pumice. The following are the types of abrasives commonly used by Henan abrasives manufacturers.
Commonly used abrasives generally have the following three categories:
(1) Oxide abrasives, powdered and lumpy, mainly used for grinding carbon tool steel, alloy tool steel, high-speed steel, and cast iron.
(2) Carbide abrasives, which are powdery and have a higher hardness than oxide abrasives. They are often used to grind high hardness materials that cannot be ground by oxide abrasives, such as cemented carbide, ceramics, and hard chrome.
(3) Diamond abrasives, both artificial and natural, have higher cutting ability than oxide carbonate abrasives, and good eye mask quality, but because of the high price, they are usually only used for grinding cemented carbide, synthetic diamond, hard chrome. And a variety of high hardness materials.