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Abrasive surface treatment process
- Jan 11, 2019 -

Plated abrasive or specially treated abrasive:

In the grinding process, the grinding machine basically carries the whole grinding process with a single layer of abrasive. The abrasive grains wear or fall off, and no backup abrasive grains continue to grind, so a limited number of abrasive grains are used for this layer. It is particularly important. How to prevent the shedding of abrasive grains and improve the grinding effect of each particle is an important topic for the current research and development of abrasive tools researchers and manufacturers. At present, the following methods have been adopted:

Calcination treatment: The abrasive is directly calcined at a high temperature of 800-1300 ° C for 2-4 hours, taken out and cooled, and used. If the temperature is high, some of the abrasives have a small amount of sintering, which can be used after being crushed and sieved. Abrasive calcination can serve two purposes. One is that the micro-cracks formed by the abrasive during the granulation process due to multiple impacts are sintered at high temperatures, which increases the strength of the single particles due to sintering during the manufacturing process. The second is to increase the capillary action of the abrasive, increase the hydrophilicity of the abrasive, and improve the adsorption of the abrasive particles on the binder, thereby making the abrasive particles adhere to the substrate by the binder. For example, after the calcination treatment of the abrasive, various effects are obvious. The microhardness of the brown fused alumina abrasive can be increased by 10% after being calcined, the toughness is increased by 10%, the hydrophilicity is increased by 3.5 times, the grinding amount is increased by 3%, and the durability is increased by 30-50%. .

Alkali treatment: The abrasive is immersed in a 2% NaOH solution for about 30 minutes, then rinsed and dried for use. Because the alkali has certain corrosive ability to the abrasive, the roughness of the abrasive surface is increased, the capillary action on the surface of the abrasive grain is improved, the bonding effect between the abrasive and the binder is facilitated, and the abrasive grain is not easily peeled off from the surface of the abrasive tool. , thereby improving the grinding effect and durability of the abrasive tool. Since the alkali has a certain etching effect on alumina, this method has a better abrasive effect on the corundum series.

Metal salt treatment: The abrasive is immersed in a metal salt solution with a concentration of 0.1%-1.0% for about 30 minutes, then taken out and dried, and the dried abrasive is calcined to 500 ° C for about 30 minutes, and then used after cooling. . If the brown fused alumina treated with 0.5% ferrous sulfate is calcined at 800 °C, the grinding efficiency can be increased by 4-20%. The commonly used metal salts are ferrous sulfate and nickel acetate. , nickel oxide, copper sulfate, copper sulfate-borax, iron nitrate, cobalt nitrate, and the like. There is also a coating abrasive using a material such as ferric oxide or triiron tetroxide adhered to the abrasive binder and calcined to 500-800 ° C for half an hour, and the coating is also used after cooling.

Treatment of ceramic coating: The ceramic liquid with feldspar, clay, or limestone is applied to the surface of the abrasive and sintered at a high temperature to coat the surface of the abrasive with a thin layer of ceramic material to facilitate the abrasive and binder. Bonding to improve the durability of the tool.

Resin treatment: The abrasive is immersed in a resin mixture consisting of liquid phenolic resin and a small amount of metal oxide such as ferric oxide, triiron tetroxide or titanium oxide as described in (3), taken out in about 30 minutes. Dry and ready to use. Because the resin liquid has good permeability and can penetrate into the tiny pores of the abrasive, the adhesion of the abrasive to the adhesive is increased, the durability of the abrasive is improved, and the abrasive is added due to the addition of metal oxide in the resin liquid. The heat dissipation of the medium abrasive particles is beneficial to the improvement of the efficiency of the abrasive.

Silane-coated treatment: Silane, also known as silicone, is a special compound in which silicon and organic genes are chemically reacted to produce inorganic and organic properties. Therefore, the abrasive after silane is beneficial to the combination of abrasive and binder. There are two ways to attach: one is to directly apply the silane liquid to the surface of the coated abrasive. The most ideal and effective thickness of the coating is single molecule thickness, which is difficult to operate; another simple method It is the direct addition of silane to the bonded glue. This method is not as effective as the former, but it is easy to handle during production.

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