Non-woven felt as the skeleton, at various spray fineness silicon carbide composite (TL), corundum (GZ), ferric oxide (Fe2O3), bauxite and other abrasive, abrasive mesh fineness is generally about 80-320 Meanwhile spray adhesive, and then after curing so firmly bonded abrasive and fiber, so that the product has a certain ability to plane grinding machine grinding and polishing sand felt.
1) Adhesives: The adhesive binder and production of non-woven felt different, the former is an emulsion type adhesive, which is solvent-free adhesive. In order to make strong bond between the abrasive and the fiber, and because of the heat generated during polishing, polishing wheel surface up to 150 ~ 180 ℃ or more, so the adhesive, in addition to the ability to have good adhesion, it must also a higher heat resistance, the current foreign alcoholic generally a modified phenol resins, epoxy resins and polyurethane resins.
2) sticky sand: Usually in a dedicated finishing composite diamond grinding disc complete. In order to ensure uniformity of the abrasive, abrasive application method is particularly important. Dusting method now widely used, its structure is mounted above an abrasive hopper, hopper installed below packages are flexible wire out feed rollers, the roller rotates uniformly abrasive cloth falls within the needle in the side of the feed roller fitted with a wire brush vibrator, internal grinding needle through the vibration of the falling abrasive cloth stripped down, fell on non-woven mat. Another approach to the non-woven mat with a spray gun, but is more difficult to ensure uniformity of abrasive, abrasive wear of the nozzle is also large, the abrasive powder or sand blasting, and then sprayed with an adhesive so that the abrasive and fiber firmly glued knot, and finally a certain practical value of the wheel.
The cutting tool is a grinding wheel, which consists of many small and hard abrasive particles and adhesive bonding agent made of the porous body. Abrasive Directly responsible for the cutting work must be sharp and has high hardness, heat resistance and a toughness. Commonly used abrasive aerobic Aluminum (also known as corundum) and silicon carbide two kinds. Alumina-based abrasive, high hardness, good toughness, suitable for grinding steel material. SiC Class abrasive hardness higher, more sharp, good thermal conductivity, but more brittle, suitable for grinding cast iron and carbide. The same abrasive wheel, due to their different thickness, the surface roughness after the workpiece and the machining efficiency is not the same, Coarse abrasive for coarse, abrasive grinding small fit, the more coarse abrasive particle size smaller numbers. From the bonded abrasive binders role. Commonly used ceramic binder, followed by resin binding agent. Choice of materials is not binding agent Same, the impact grinding the corrosion resistance, strength, heat resistance and toughness. Electrode wear Abrasive grains bonded more firmly, the more difficult from the wheel fell off, they said grinding wheel hardness, the hardness of the wheel is the sand The surface of the abrasive wheel off the ease of external force. Off easily called soft, otherwise known as hard. Wheel hardness The hardness of the abrasive are two different concepts. Surface of the workpiece to be ground is relatively soft, abrasive edge (edges) is not easy to wear Loss, so that grain can be used for a longer time, that some of the optional bonding firm wheel (higher hardness wheel) Conversely, low hardness grinding wheel for high hardness of the workpiece. Wheel in high-speed conditions of work, in order to ensure safety, should be checked before installation, there should be no cracks and other defects; In order to make the wheel work smoothly, balancing test should be carried out before use. Grinding work after a certain time, the surface of the gap may be clogged debris, blunt abrasive acute angle, the original geometry Shape is distorted. Therefore, the ability to be cut and trimmed in order to restore the correct geometry. Wheel dresser diamond pen required The structure and surface grinder grinding motion Many different types of grinding machines, mainly surface grinder, cylindrical grinder, internal grinder, universal cylindrical grinding machine (also mill Kong), gear grinding, thread grinding machine, rail grinding, centerless grinding (cylindrical grinding) and tool grinder (grinding tool) and so on. Here surface grinder and its movement.