Six Features of Organic Abrasives
The characteristics of organic abrasives are wide range of use, certain elasticity and high bonding strength, and good polishing performance. It has been used in rough, fine, fine, polishing and other grinding processes, and its resin abrasive tools have the following characteristics:
1. High bonding strength
Compared with vitrified bond, resin bond has high bonding strength, and its resin grinding wheel has a grinding linear speed of 80~120m/s, and can withstand greater grinding pressure. The grinding pressure of heavy-duty grinding wheel is as high as 10×104～40×104N, which is widely used in iron and steel industry, such as various steel ingots, billets and other barren grinding processes. High-speed and heavy-duty special grinding wheel and other rough grinding processes are safe to operate, suitable for high-speed grinding and high-feed grinding, and have high grinding efficiency.
2, has a certain flexibility
Compared with ceramic abrasives, resin abrasives have good toughness, certain plasticity and ductility. Its elastic modulus (E) is several times lower than that of ceramics. Therefore, resin abrasives are suitable for preparing various specifications of thin-film grinding wheels and high-speed cutting grinding wheels. At the same time, due to a certain elastic deformation, the grinding force can be buffered. Therefore, the grinding effect is good, there is a polishing effect, and the roughness of the machined surface can be improved.
3. Abrasives with various complex shapes and special requirements can be made
Due to the low hardening temperature of resin-bonded abrasive tools, it can be hardened at room temperature and has a small shrinkage rate, and can be made into abrasive tools with various complex shapes and special requirements. Such as: resin grinding wheel reinforced with glass fiber, porous resin grinding wheel and groove grinding wheel with easy chip removal and good heat dissipation; bolt-fastening grinding wheel, electrolytic grinding grinding wheel, polishing grinding wheel for improving grinding process conditions; Shaped, butterfly and other special-shaped grinding wheels.
4. Wide range of application
Due to the variety of new resin binders, resin abrasive tools with various strengths and performances can be made. Therefore, it can be widely used in rough grinding, rough grinding, cutting, semi-fine grinding, fine grinding, polishing and other processes. Resin abrasives have high bonding strength, high use speed, impact resistance, and are suitable for rough grinding and rough grinding; resin abrasives have good toughness and are suitable for cutting processes; resin abrasives have good elasticity and certain polishing properties, and can be used For fine grinding and polishing. Resin abrasives have low heat resistance and are easy to wear, and are suitable for surface grinding and fine grinding.
5. It is beneficial to prevent the workpiece being ground from being burnt
The resin bond has low heat resistance, which can reduce or avoid the phenomenon of burnt workpiece. The heat generated by the workpiece during the grinding process firstly carbonizes the resin, prompting the passivated abrasive to fall off automatically, exposing new sharp abrasive particles, reducing the heat in the grinding area and avoiding the workpiece burn.
6. The hardening temperature of resin abrasive tools is low, the production cycle is short, and the equipment is simple.
In the process of machining workpieces with grinding wheels, it is generally necessary to use a grinding wheel dresser to dress the grinding wheel accurately. Sometimes the shape of the workpiece to be processed is special, and the shape of the grinding wheel should also be dressed with a dresser. Different types of grinding wheels require different dressers. Generally, the corundum grinding wheel and silicon carbide grinding wheel of vitrified bond can be dressed with a diamond pen. If the hardness of the grinding wheel is relatively low and the processing requirements are not high, a hardened silicon carbide grinding wheel can also be used for dressing. If you need to dress superhard grinding wheels such as diamond grinding wheels, diamond grinding wheels, CBN grinding wheels, cubic boron nitride grinding wheels, etc., most of them can be dressed with ceramic grinding wheel blocks.
Types of Grinding Wheels Grinding wheels generally combine abrasive grains with a special process, and then perform grinding, cutting, grinding, polishing, etc. on the workpiece, so the grinding wheels can be roughly classified from the perspective of bonding agents. Electroplated diamond grinding head is a general term for small shank grinding tools, which are used in electric grinders, hanging grinders, and hand drills. There are many types, mainly ceramic grinding heads, rubber grinding heads, diamond grinding heads, abrasive cloth grinding heads, etc. Through the understanding of the grinding wheel bond, it is easier to master the use of the grinding wheel, master the performance of the grinding wheel, and maximize the role of the grinding wheel. Commonly used binders can be divided into two categories: organic binders and inorganic binders, organic binders include resin binders and rubber binders, inorganic binders include ceramic binders, diamond binders and metal binders.
1. The diameter of the grinding wheel chuck shall not be less than one third of the diameter of the grinding wheel to be installed. The diameter of the grinding wheel chuck for cutting off the grinding wheel shall not be less than a quarter of the diameter of the grinding wheel to be installed.
Grinding wheel classification There are many kinds of grinding wheels. According to the abrasive used, it can be divided into ordinary abrasive (corundum and silicon carbide, etc.) grinding wheel and natural abrasive superhard abrasive and (diamond and cubic boron nitride, etc.) grinding wheel; according to shape, it can be divided into flat grinding wheel, bevel grinding wheel, cylindrical grinding wheel, Cup-shaped grinding wheel, disc-shaped grinding wheel, etc.; according to the binder, it can be divided into ceramic grinding wheel, resin grinding wheel, rubber grinding wheel, metal grinding wheel, etc. The characteristic parameters of grinding wheel mainly include abrasive, particle size, hardness, binder, shape, size, etc. Since the grinding wheel usually works at high speed, a rotation test (to ensure that the grinding wheel will not break under the working speed) and a static balance test (to prevent the machine tool from vibrating during operation) should be carried out before use. Grinding wheels should be reconditioned to restore grinding performance and correct geometry after a period of operation.