How To Extend The Service Life Of Sand Belts

The production process of sand belts has strict requirements for sand belt substrates, abrasives, binders, and sand planting density. The premature end of the life of sand belts is often caused by improper use. Below, we will analyze several typical problems.

1. Cover sticking:

When a layer of metal material is covered on the abrasive cutting edge, it becomes sticky and the surface of the sand belt becomes shiny, giving a smooth feeling when touched. Adhesive cover mainly occurs in high-strength metal materials, especially in hard and tough materials.

Insufficient grinding pressure is the main cause of cover sticking. For materials with high hardness, insufficient pressure makes it difficult for the abrasive particles to penetrate the workpiece and make it difficult for the abrasive particles to break and sharpen themselves.

A softer contact wheel or pressure plate, even with sufficiently high grinding pressure, will only cause severe collapse and make it difficult for abrasive particles to press into the workpiece.

The higher sand belt speed results in insufficient time for the abrasive particles in the grinding area, thinning the depth of penetration into the workpiece, and severe heating.

The causes of sticking caps are comprehensive, and the solutions are also comprehensive. That is to say, suitable contact wheels or pressure plates, sufficiently high grinding pressure, and lower belt speed are the fundamental solutions to the problem. Of course, choosing abrasives with good self sharpening properties is also necessary.

2. Blushing:

During the grinding process, although all the abrasive particles are still present, the sharpness is already very poor. This is because the abrasive cutting edge becomes dull due to wear, and this phenomenon is called dullness. Normal dullness refers to the end of the lifespan of the abrasive belt. Obviously, what we refer to as "dullness" here is mainly caused by improper selection or use of the abrasive belt before the abrasive particles are fully consumed.

Soft contact wheels or pressure plates make it difficult for abrasive particles to penetrate the workpiece, resulting in a smooth edge.

Insufficient grinding pressure can also make the abrasive belt dull, and the abrasive is difficult to self sharpen.

When the workpiece is hard, it is not appropriate to choose a sand belt, or the sand belt speed is high and it is difficult to cut into the workpiece and grind it dull.

The abnormal wear and tear of the sand belt seriously affects its service life, greatly increasing processing costs, and therefore cannot be ignored.

3. Blockage:

Blocking is when the gap between abrasive grains is quickly covered and filled by chips before the cutting edge of the abrasive grains is completely dull, causing the sand belt to lose its cutting ability.

There are many reasons that can cause blockages, mostly due to improper use, processing materials, and selection of sand belts

The contact wheel or pressure plate is too soft, making it difficult for the abrasive particles to penetrate into the workpiece. The abrasive belt is mainly in a grinding state, and the temperature in the processing area is heated due to friction, causing chips to "weld" onto the abrasive belt, causing blockage. The solution should be to use hard contact wheels and pressure plates, or contact wheels and pressure plates with peak tooth backs, or small diameter contact wheels, etc.

If the speed of the sand belt is too high, it is difficult for the abrasive particles to effectively penetrate the workpiece, which can also cause blockage and workpiece burns. In this case, the speed of the sand belt should be reduced.

The processed materials that are too soft (such as non-ferrous metals such as aluminum and copper) are prone to clogging the surface of the sand belt. The solution should be to use sparse planting sand belts; Use coarse-grained sand belts while meeting the roughness requirements. Using brittle silicon carbide abrasive belts; Adopting the method of adding grinding aids, such as using lubricants.