Polishing steel brush machine adapt to steels of different hardness

Polishing steel brush machines adapt to steels of different hardness mainly in the following ways:

1. Choose the right abrasive

Types of abrasives: For steels with lower hardness, such as low carbon steel, aluminum oxide abrasives can be used. Aluminum oxide abrasives have moderate hardness and can effectively remove surface defects on low carbon steel while avoiding excessive damage to the steel surface. For alloy steels or high carbon steels with higher hardness, silicon carbide abrasives can be used. Silicon carbide has higher hardness and strong cutting ability, and can handle the hardened layer and rough parts on the surface of high hardness steel to achieve better polishing effects. For example, when processing mold steel, silicon carbide abrasives can more efficiently smooth the processing marks on the mold surface.

Abrasive grit: When dealing with steels of different hardness, the choice of abrasive grit is also different. For softer steels, a coarser grit can be used for the initial rough polishing to quickly remove surface impurities and unevenness. As the polishing progresses, gradually switch to a finer grit abrasive. However, for hard steels, the abrasive used during rough polishing should not be too coarse, so as not to leave deep scratches on the steel surface that are difficult to remove later. For example, when polishing a stainless steel knife with a higher hardness, an 80-120 mesh abrasive may be used for rough polishing, while a 60-80 mesh abrasive may be used for rough polishing of soft steel.

2. Adjust the polishing wheel and polishing parameters

Polishing wheel material: There are different choices of polishing wheel materials for different hardness of steel. For soft steel, cotton polishing wheels can be used. Cotton is soft and can better fit the surface of the steel, making the abrasive act evenly while avoiding scratches. For hard steel, harder polishing wheels such as polyurethane polishing wheels can be selected, which can withstand greater pressure and ensure that the abrasive effectively cuts the high-hardness steel surface. For example, when polishing soft decorative carbon steel sheets, cotton polishing wheels can achieve a smooth surface; while when polishing hard industrial chrome steel bars, polyurethane polishing wheels are more suitable.

Speed and pressure adjustment: When polishing softer steel, the polishing machine speed can be appropriately reduced and the pressure should not be too high. Because soft steel is easy to wear quickly, if the speed and pressure are too high, it may cause pits on the steel surface or over-polishing. For hard steel, the speed and pressure can be appropriately increased to enhance the cutting effect of the abrasive on the steel surface. For example, when polishing low-hardness construction steel, the speed can be set at 1500-2000 rpm and the pressure is kept at a moderate level; when polishing high-hardness bearing steel, the speed can be increased to 2500-3000 rpm and the pressure is increased accordingly, but it must be within the tolerance range of the equipment and steel.

3. Use the right polishing fluid

Polishing fluid composition: For steels of different hardness, the composition of the polishing fluid is different. For soft steel, the polishing fluid may contain a certain proportion of lubricants and corrosion inhibitors to reduce the friction between the abrasive and the steel and prevent the steel surface from rusting. For hard steel, the polishing fluid may add some ingredients that help improve cutting efficiency, such as some active additives, to enhance the abrasive's ability to remove the hard steel surface. For example, when polishing soft tinplate, a polishing fluid containing lubricants can make the surface smoother; and when polishing hard high-speed steel, a polishing fluid containing active additives can speed up the polishing speed.

Polishing fluid concentration and supply: When polishing soft steel, the polishing fluid concentration can be slightly higher and the supply can be appropriately increased to ensure good lubrication and cooling effects. For hard steel, the polishing fluid concentration and supply should be accurately adjusted according to the actual polishing situation, to ensure the cutting effect and avoid excessive lubrication affecting the abrasive effect. For example, in the polishing of large soft steel components, sufficient polishing fluid can maintain the stability of the entire polishing process; while in the polishing of small hard steel parts, the supply of polishing fluid should be accurately controlled to obtain the ideal polishing quality.

If you need high quality polishing steel brush machine, please contact Wandeshun Machine for more questions.