Introduction to grinding tool manufacturing and working principle

The abrasive tools can be divided into three types: compact, medium and loose. Each class can be further subdivided by the organization number. The larger the size of the grinding tool, the smaller the volume percentage of the abrasive in the grinding tool, the wider the gap between the abrasive particles, indicating the looser the tissue. Conversely, the smaller the organization, the tighter the organization. It is not easy to passivate when the abrasive tool with loose tissue and has less heat during grinding, which can reduce the heat deformation and burn of the work-piece. The abrasive particles of the more compact abrasive tools are not easy to fall off, which is conducive to maintaining the geometric shape of the abrasive tools. The structure of the abrasive tool is only controlled according to the formula of the abrasive tool during manufacture. The super hard abrasive consolidation grinders are mainly composed of diamond, cubic boron nitride and other abrasives. Due to the price of diamond and cubic boron nitride is high, has the very good wear resistance, use them to manufacture the consolidation of abrasive, unlike ordinary abrasive abrasive consolidation, besides super hard abrasive layer, transition layer and the substrate.

The super hard abrasive layer is the cutting part, which consists of the super hard abrasive and the binder. The matrix plays a supporting role in grinding and consists of metal, electric woodor ceramic materials. The transition layer is used to connect the substrate to the super hard abrasive layer, which is composed of a binder and is sometimes omitted. Common adhesives include resin, metal, electroplating metal and ceramics.

Introduction to grinding tool manufacturing and working principle

The manufacturing processes of consolidation grinders include: distributing materials, mixing materials, forming, heat treatment, processing and inspection. The manufacturing process varies with the binder. Ceramic binder grinding tool mainly adopts profiling method, the abrasive and binder ratio according to the formula of weight after weighing, placed inside the mixer mixing, metal mold, forming the abrasive blank on the pressure. Blank loading again after the drying kiln roasting, sintering temperature is 1300℃or so commonly. When using low melting point burning-out binder, sintering temperature below 1000℃. According to the specified size and shape precision processing, final inspection of the product.

Resin-bonded abrasive tools are usually shaped at room temperature on a pressure machine, but there is also a heating under the heating pressure process. Harden in hardened furnace after forming. Phenolic resin as binder, curing temperature is 180 ~ 200℃. The grinding tool of rubber binding agent is mainly made by mixing materials of roll machine and rolling into thin sheet. Also some with loose material, into the metal mold inner pressure molding machine. In vulcanizing tank after vulcanization molding, temperature is 165 ~ 180℃.

The manufacturing process of metal bond abrasive tools includes powder metallurgy method and electroplating method. In powder metallurgy, bronze and other materials are used as binding agents. The mixture is formed by hot pressing or pressing at room temperature and then sintered. Using nickel or nickel cobalt alloy as the plating metal, the abrasive is consolidated on the substrate according to the plating process to make the grinding tool.

Special types of grinding have sintered corundum grinding tools and fiber grinding tools. Sintered corundum grinding tool is made from alumina powder and the right amount of chrome oxide mixing, molding, at about 1800℃sintering. This kind of abrasive tool is compact in structure and has high strength. It is mainly used for the processing of clocks, meter sand other parts. Fiber abrasives are made from fiber threads containing or adhering to abrasive materials, Such as nylon which have good elasticity and are mainly used for polishing metal materials and their products.