White corundum is widely used as we all know. Product size according to international standards and the standard production, can be processed according to user requirements granularity. The general particle size number is F4 ~ F220, and its chemical composition varies depending on the particle size. The prominent point is that the crystal size is small and impact resistant. If the self-grinding machine is used to process and break, the particles are mostly spherical particles, the surface is dry and clean, and it is easy to bond.

White corundum is the main raw material of alumina powder, suitable for chromium oxide, etc., by high temperature smelting. Chromium corundum is pink, the hardness is similar to that of white corundum, and the toughness is higher than that of white corundum.

Abrasives made of white corundum have good durability and high grinding finish. Suitable for precision grinding of measuring tools, machine tool spindles, instrument parts, threaded workpieces and sample grinding.

White corundum in the metallurgical industry, chromite is mainly used to produce ferrochrome alloy and chromium metal. Ferrochrome alloy as an additive to steel to produce a variety of high-strength, corrosion-resistant, wear-resistant, high-temperature-resistant, oxidation-resistant steels, such as stainless steel, acid-resistant steel, heat-resistant steel, ball bearing steel, spring steel, tool steel and so on. Metal chromium is mainly used for smelting alloys with cobalt, nickel, tungsten and other elements. These kinds of steels and alloys are indispensable materials for aviation, aerospace, automobiles, shipbuilding, and anti-industrial production of guns, missiles, rockets, and ships. In refractory materials, chromite is used to make chrome bricks, chrome-magnesium bricks and other special refractory materials.

In addition, white corundum is made of industrial alumina powder as raw material, melted at a high temperature above 2000 degrees in an arc and cooled. It is crushed and reshaped, deironized by magnetic separation, and sieved into various particle sizes. Its texture is compact, high in hardness, and the particles form sharp corners. It is suitable for manufacturing ceramics, resin consolidated abrasives, grinding, polishing, sandblasting, precision casting, etc., and can also be used for manufacturing refractory materials.

Today we want to introduce to you is "metal based white corundum as a roller for circular grinding wheel dressing", I hope to help you, but also want to understand the friends get some consensus.

Superhard materials such as silicon carbide, silicon nitride ceramics, etc. are introduced as mold materials into optical glass molding technology with complex microstructure functional surfaces, which greatly improves the productivity of microstructure optical components. However, the high hardness and wear resistance of superhard materials make the ultra-precision grinding of such molds become the key technology of optical glass molding process, and the precision dressing technology of white corundum has become the technical bottleneck of micro-structure ultra-precision grinding technology.

Through the summary and analysis of the current situation of the research on the direction of precision dressing of internal and external forming grinding wheels, it is believed that the mechanical precision dressing after the electric spark dressing of metal-based white corundum can improve the dressing accuracy and improve its surface morphology. Aiming at the existing arc/V-shaped white corundum, based on the technical conditions of this laboratory, the grinding wheel is dressed by the expansion method, and the corresponding CNC dressing trajectory is designed according to the expansion motion and the relevant program is compiled. Secondly, according to the principle and application analysis of dry EDM dressing, the arc-shaped and V-shaped white corundum were tested by EDM dressing. For the arc-shaped white corundum, the higher rotation accuracy and the shape accuracy of the arc grinding edge can be obtained by electric spark dressing. For the V-shaped white corundum, although the rotation accuracy of the grinding wheel can be guaranteed, the V-shaped discharge should lead to the arc radius is still large.

The 140/170# white corundum disc wheel was used to trim the 40/50# coarse-grained single-layer brazed white corundum, the principle of disc wheel dressing and the evaluation method of dressing results, and then the design and manufacture of the disc wheel dressing device and dressing disc wheel were carried out. The dressing test of 40/50# coarse-grained white corundum was carried out using 140/170# white corundum disc wheel, and the dressing results were evaluated by tracking the morphology of white corundum abrasive grains, measuring the height of white corundum abrasive grains, and the surface quality and grinding force of SiC ceramics. The high-speed grinding process test of 40/50# coarse-grained white corundum was carried out, and the effects of different grinding parameters on the grinding force, surface roughness and surface morphology of SiC ceramics were analyzed to evaluate the grinding performance of coarse-grained white corundum after dressing.

After the electric spark dressing test, the V-shaped white corundum was dressed by GC dressing wheel. The test results show that the use of GC grinding wheel dressing can improve the rotation accuracy of V-shaped white corundum to 0.6 μm, the arc radius reaches about 17 μm, and the GC grinding wheel dressing method improves the surface morphology of the dressing wheel. At the same time, because the GC dressing wheel wears faster, resulting in different areas of the V-shaped grinding blade rotation accuracy distribution law is different, making the GC dressing wheel is no longer suitable for arc-shaped white corundum dressing. In this test, metal-based white corundum was used as a roller to dress the arc-shaped grinding wheel. The test results show that the clogging caused by the rapid wear speed of the white corundum particles of the roller will lead to the deterioration of the dressing accuracy of the dressing wheel and even chipping.

The V-shaped groove array is obtained on the surface of silicon nitride ceramic by using the trimmed white corundum, and the arc groove array is obtained on the surface of silicon carbide ceramic. The test results show that the surface roughness of the V-shaped groove is about 134.6nm, the radius of the V-tip arc is greater than 45μm, and the accuracy loss of the arc radius is relatively fast. The surface roughness value of the circular arc groove is about 146.1nm, and due to the chipping of the circular arc grinding wheel, the surface of the circular arc groove has a protrusion of 7.2530μm, making the PV value of the whole circular arc reach 53.0557μm. The SEM images show that the material removal method is mainly plastic domain removal: observing the surface of silicon nitride ceramics will find more pores and the chipping caused by pores in the grinding process.