General knowledge of angle grinders
Source:Yongkang Dengda Abrasives Co., Ltd.Publication time：2019-11-13
An angle grinding piece is a resin grinding tool which uses a fiber fabric as a reinforcing material. Angle grinders have high tensile, impact and flexural strength. Angle grinders are widely used for grinding and descaling of various metal and non-metal materials. They are fast and economical. Resin is used as a binder and fiberglass is used. Grid for enhanced high-speed grinding tool, it has high toughness impact strength, high grinding rate, easy to use, speed of up to 80m / s, installed on all kinds of sanding machine for free grinding, easy to use, extensive Used in automotive, marine, machine manufacturing and metallurgy, chemical construction in all aspects. Clean solder joints, solder joints, polished castings, burrs, burrs, and repair metal surface defects. Used for ordinary steel, steel pipe, angle steel, stainless steel, sheet steel, stone, concrete cutting and so on.
Angle grinders are tools for grinding, grinding and polishing. Most of the abrasive tools are artificial abrasives made of abrasive plus binder, and also abrasives directly processed from ore. In addition to being widely used in machinery manufacturing and other metal processing industries, abrasive tools are also used in the processing of food processing, paper industry and non-metallic materials such as ceramics, glass, stone, plastics, rubber, and wood.
During the use of the abrasive tool, when the abrasive particles are blunt, the abrasive grains are partially or completely detached from the abrasive tool due to partial fragmentation of the abrasive particles or the bond breakage, and the abrasives on the working surface of the abrasive tool are constantly emerging. Cutting edge, or constantly revealing new sharp abrasive particles, so that the grinding tool can maintain cutting performance within the specified time
Abrasives are classified according to their raw materials, including abrasives and artificial abrasives. The abrasive tools commonly used in the machinery industry are only oilstone. Artificial abrasives are distinguished according to their basic shapes and structural features. There are five types of grinding wheels, grinding heads, oilstones, sand tiles (collectively referred to as consolidated abrasives) and coated abrasives.
Ordinary abrasive bonded abrasives are abrasive tools in which a fixed abrasive is consolidated into a fixed shape by a bonding agent and has a fixed strength. Generally composed of abrasives, binders and pores, these three parts are often referred to as the three elements of bonded abrasives.
Angle grinder consolidation abrasives can be divided into ordinary abrasive bonded abrasives and superhard abrasive bonded abrasives according to the abrasive used. The former uses ordinary abrasives such as corundum and silicon carbide, and the latter is made of superabrasives such as diamond and cubic boron nitride.
The abrasive plays a cutting role in the abrasive tool. Bonding agents are materials that consolidate loose abrasives into abrasive tools, both inorganic and organic. Inorganic binders include ceramics, rhombohedral and sodium silicate; organic resins, rubber and shellac. Ceramic, resin and rubber binders are commonly used.
The hardness of the abrasive tool mainly depends on the amount of the binder added and the density of the abrasive. The abrasive particles are easy to fall off, indicating that the hardness of the abrasive is low; otherwise, the hardness is high. The hardness grades are generally divided into seven levels: super soft, soft, medium soft, medium, medium hard, hard and super hard. From these levels, several small levels can be subdivided. The method for determining the hardness of the grinding tool is more commonly used by a hand cone method, a mechanical cone method, a Rockwell hardness tester method, and a sand blast hardness tester.
The hardness of the abrasive tool has a corresponding relationship with its dynamic elastic modulus, which is advantageous for determining the dynamic modulus of the abrasive tool by the audio method to indicate the hardness of the abrasive tool. In the grinding process, if the material of the workpiece to be ground is high in hardness, a grinding tool having a low hardness is generally used; and vice versa, a grinding tool having a high hardness is used.
The angle grinder tissue is roughly classified into three types: compact, medium, and loose. Each class can be subdivided, etc., and is distinguished by the organization number. The larger the abrasive tissue number, the smaller the volume fraction of the abrasive in the abrasive tool, and the wider the gap between the abrasive grains, indicating that the tissue is looser. Conversely, a smaller organization number indicates a tighter organization. The organization of the abrasive tool is controlled only by the abrasive formula at the time of manufacture, and is generally not measured. The abrasive particles of the tighter structure are not easy to fall off, which is beneficial to maintain the geometry of the abrasive tool. The abrasive material of the looser structure is not easy to passivate when used, and the heat is less during the grinding process, which can reduce the heat deformation of the workpiece.