The grinding wheel industry has developed along with the development of the whole industry. In ancient times, the use of natural rock for grinding was the earliest grinding. With the development of society, the grinding industry has become more and more complex, and the requirements for China cutting disc for metal have become higher and higher. Natural rock has been unable to meet the requirements of grinding, and people have begun to study new abrasives. The synthetic resin bond grinding wheel is a relatively late grinding wheel that has developed with the development of the chemical industry. From the use of natural resins to the replacement of natural resin binders with synthetic resins, it has also gone through a process.
Due to the unique advantages of resin binders, it has rapidly evolved in many grinding processes by replacing ceramic or rubber bond grinding wheels. The resin grinding wheel has a high bonding strength, a certain elasticity, can be made into various complicated shapes and special requirements of the grinding wheel, has a wide range of use, is beneficial to prevent burns caused by the workpiece being ground, has low hardening temperature, short production cycle and simple equipment. And other characteristics. The cutting speed is fast in the processing, the dimensional accuracy of the cutting is high, the surface to be cut is smooth, and it can be used for cutting of hard materials. Therefore, the improvement of the manufacturing level of resin dicing sheets is of great significance to the development of industry. Due to the high cost of raw materials, rational design and selection of raw materials are also important to reduce production costs and improve plant efficiency.
There are a large number of abrasive grains on the surface of the cutting piece, and the shape, size and distribution are irregular and random. The number of cutting edges participating in the cutting depends on the specific conditions. The radius of the end face of the abrasive grain blade is large, and the negative rake angle (generally 85°-65°) is small at the time of cutting. The radius of the obtuse angle is large, and the surface metal of the workpiece is strongly pressed under the abrasive grain during grinding. The deformation.
The thickness of the chips cut by each abrasive grain is very thin, generally only a few microns, so the machined surface can obtain high precision and low surface roughness. The general precision can reach IT6-IT7 grade, the surface roughness can reach 0. 08-0.05 pm, precision grinding can reach higher, so grinding is often used in the finishing process.
Grinding efficiency is slim. The aluminum flat cutting disc is about 35m/s, which is about 20 times higher than that of ordinary tools, and a high metal removal rate can be obtained. Not only can be finished, but also rough, rough and heavy-duty grinding.
The hardness of the cutting piece is high, the thermal stability is good, not only can grind steel, cast iron and other materials, but also can grind various high hardness materials, such as hardened steel, hard alloy, glass, ceramic, stone and so on. These materials are difficult to machine with general turning, milling, and the like.
The abrasive particles have a certain brittleness. Under the action of the grinding force, it will rupture, thus updating its cutting edge, which is called the “self-sharpening effect” of the cutting piece.
Grinding temperature. Due to the high grinding speed, the deformation is fast. The heat generated in the grinding zone is large, so that the temperature in the grinding zone is high.