Four Material Features and Options for Shear Cutters

Plays a decisive role in the development of materials technology advancing shears cutters. This article describes the use of cutting diamonds, polycrystalline cubic boron nitride, ceramics, carbide, and HSS cutting tool materials. This tool is a rational use of materials, the theoretical basis of the tool failure mechanism, the performance of the supporting workpiece material and the important basis of the cutting shears tool material tool material reasonable selection, according to the mechanics of the shears tool material and the choice of workpiece material, physical and Chemical Shearer Tool Material Properties for Good Cutting Results. The choice of piston material for cutting tool cutting is described. High-speed steel: piston lift milling, milling cutters, high-speed steel drill bits, so the expansion slot milling drills horizontal trench. CBN: The CBN shears cutter is used to insert a hoop groove for turning. Applied to the piston by the process. Diamonds: High hardness, high wear resistance, high thermal conductivity and low friction coefficient and wear-resistant high-precision non-ferrous metal materials, high efficiency, high stability and gold diamond tools Available diamond surface finish. When cutting aluminum alloy, the tool life of PCD hard alloy cutting plate cutter is several tens or even several hundred times. Precision machining of aluminum piston, piston ring groove has been in the finishing car, fine boring the piston pin hole, using thin cylindrical piston The ideal tool is finishing and finishing, such as the piston cavity in the piston top finishing process. The quality of the tool material of the shears will affect the surface quality, cutting efficiency, and basic life of the tool life of the shears. When cutting, the cutting work is directly responsible for the cutting part of the shears cutter. Good or bad depends on the geometry of the shears and the design of the structural shears tool material selection tool is a reasonable part. Shearer tool life and productivity levels, multi-purpose tool consumption and processing costs, benefits and machining accuracy and surface quality defects, reasonable choice depends mainly on tool material. Select the right part of the tool design and selection tool for the appropriate cutting tool. Each species has its own processing tool material in a specific range, which material can be applied only to the workpiece and the cutting speed is within a certain range. The life spans of different shearing tool materials, shearing tools and tooling and different types of workpiece materials are often quite different. For example, when machining aluminum pistons, the life of the diamond shears cutter is YG carbide cutting blades. The machine tool life is several times to dozens of times; the silicon carbide YG handles high capacity, and the low life expectancy is very different from aluminum. Therefore, the key to successful choice of cutting tool is the key to success. Each tool for a reasonable match has its own excellent material processing objects, cutting tools and machining. The basic characteristics of the hardness of the tool material should be possessed. From the tool chip of the workpiece, the tool must have a greater hardness than the hardness of the workpiece material. The hardness of the cutting edge is more than the 60HRC metal cutting tool. Abrasion resistance is the ability of a material to resist wear. Under normal circumstances, the cutting tool material, better wear resistance, the higher the hardness. In hard tissues, the distribution of particles is more uniform and the abrasion resistance of better particles becomes smaller. The chemical composition of wear resistance and friction materials is high temperature strength, microstructure and related fields. The resistance of the worn material can be formulated to withstand tremendous pressure, make the tool, and often reduce the cutting work under impact and vibration conditions without causing chipping and breakage. The shearing tool material must have sufficient strength and toughness. High heat-resistant material cutting 1.3 main signs. It refers to maintaining the hardness of the tool material, wear resistance, strength and toughness properties at high temperatures. The tool material should have resistance to oxidation at high temperatures and excellent diffusion bonding resistance, ie, the tool material should have good chemical stability. When the cutting tool or cutting fluid is interrupted, usually in a great cause of thermal shock resistance. Tools and materials for thermal shock resistance, heat shock factor r, r is defined as: large thermal conductivity, so that the heat easily dispersed, reducing the temperature gradient surface of the tool; thermal expansion coefficient, thermal deformation can be reduced; elastic mold The small amount can reduce the alternating stress amplitude due to thermal deformation; heating favorably affects the improved performance of the material. In order to facilitate the manufacture of cutting tools, tools and materials are required to have good processing properties such as forging properties, heat treatment properties, high temperature plastic deformation properties, and grinding performance. The economy is an important indicator of tool material, but high-quality single-piece shears, cutter materials, and shears cost a long tool life, but due to high costs, they are not necessarily shared components. Therefore, the choice of tools in considering the material and its economic impact. 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