Different 20 sanding disc should be used for different workpiece materials and different processing requirements. Even if the same workpiece material is ground, the grinding ratio of different grades of 20 sanding disc may differ by a factor of 2 to 5, so a suitable 20 sanding disc should be used.
Diamond 20 sanding disc are the best grinding tools for grinding high hardness and brittle non-metallic materials such as cemented carbide, optical glass, ceramics, precious stones and stone. However, since diamond is easily carbonized at a temperature of 700 ° C to 800 ° C, it is not suitable for grinding steel. CBN has a slightly lower hardness than diamond but has good thermal stability (can withstand temperatures from 1300 ° C to 1400 ° C). It does not decompose at high temperatures like diamonds, ie oxidation and graphitization. It is chemically inert to iron. The thermal conductivity is high (46 times that of corundum), and the 20 sanding disc made of it has a long service life (up to several times to several hundred times of the corundum 20 sanding disc). It is an alternative steel for hardening corundum 20 sanding disc, high speed tool steel and bearing. steel. The best abrasives for high hardness and tough metal materials such as stainless steel, heat resistant steel and titanium alloys.
The adhesives for superabrasive 20 sanding disc are resin, metal, ceramic, electroplated and brazed. Resin bonded 20 sanding disc are mainly used for sharpening, measuring tools, grinding, external grinding and surface grinding; metal bond 20 sanding disc are used for cutting and grinding, shaping curve grinding machines, single-edge grinding tools, small bit grinding. The spiral groove is also suitable for electrolytic grinding; the ceramic bond 20 sanding disc itself has high grinding efficiency, good shape retention, high durability, easy dressing, long service life of the 20 sanding disc and good chemical stability. It has heat resistance, oil resistance, acid resistance and alkali resistance, can adapt to various grinding liquids, and has low grinding cost. Therefore, it has become the first choice for efficient, high-precision grinding. Electroplated 20 sanding disc are suitable for high speed fine grinding and forming grinding. It is also suitable for efficient grinding of wet holes (wet grinding) and for use on coordinate grinding machines; brazing 20 sanding discs are suitable for ultra-high speed grinding.
It must be pointed out that different grades of abrasives have different crystal forms and particle shapes due to different manufacturing processes, and have different strength, thermal stability and fracture characteristics, which should be based on the type of adhesive, grinding of the workpiece material. And depending on the grinding. method. Choose other abrasives. For ceramic bonded 20 sanding disc for efficient and high-precision grinding, high-strength and fine-grained abrasives or other similar properties can be used. Superhard grinding surfaces are also coated with a metal coating (metal plating can enhance and toughen and slow down) Thermal shock, combined with bridges between abrasive particles and binders to improve the performance of the 20 sanding disc and electroless metal. The type should be selected according to the different types of adhesive, workpiece material, dry and wet grinding. Dry grinding Use copper cloth; wet grinding uses nickel clothes. Currently, electroplated metals have evolved from nickel and copper to titanium, tungsten alloys, non-metal ceramics, etc., from single coatings to composite coatings, and have evolved from abrasive coatings to Micro-powder plating. Wet grinding uses nickel clothes.
The concentration of the hard 20 sanding disc can not be chosen too low, the high concentration will bring a higher grinding rate, and the 200% concentration super hard 20 sanding disc is actually a kind of ordinary 20 sanding disc with super hard abrasive as auxiliary material, which is generally not recommended. Currently, high-speed, high-efficiency grinding uses a higher concentration of ceramic bonded seals to prevent the entry of superabrasives and accelerate the wear of the parts. There must be a relatively complete system for filtering and cutting supplying the slurry to the graphite powder. This method is also applicable to resin and ceramic bonded 20 sanding disc.