1 Overview
The general trend in the development of machining is high efficiency, high precision, high flexibility and environmental awareness. In the field of machining, cutting (grinding) is the most widely used processing method. High-speed cutting is the development direction of cutting and has become the mainstream of cutting. It is an important common key technology for advanced manufacturing technology. The promotion of high-speed cutting technology will greatly increase production efficiency and processing quality and reduce costs. The development and application of high-speed cutting technology is determined by advances in machine tools and tooling technology, where advances in tool materials play a decisive role. Studies have shown that at high speed cutting, as the cutting speed increases, the cutting force decreases, and the cutting temperature rises very high. After reaching a certain value, the rise gradually slows down. The main cause of tool damage is mechanical friction, bonding, chemical wear, chipping, crushing and plastic deformation under the action of cutting force and cutting temperature. Therefore, the most important requirement for high-speed cutting tool materials is high temperature. Mechanical properties, thermophysical properties, anti-blocking properties, chemical stability (oxidation, diffusivity, solubility, etc.) and thermal shock resistance as well as resistance to coating cracking. Based on this requirement, in the past 20 years, a number of tool materials suitable for high-speed cutting have been developed, and various workpiece materials can be machined under different cutting conditions. At present, the aluminum alloy can be cut at a high speed of 2500 to 5000 m/min (Si content ≤ 12%, more than 12% is 500 to 1500 m/min): Cutting cast iron at 500-1500 m/min: 300-1000 m/min cutting steel: 100 ~400m/min cutting hardened steel, heat resistant alloy: cutting titanium alloy from 90 to 200m/min. Of course, people are also looking forward to processing at ultra-high cutting speeds for better results.
2 Progress and application of foreign high-speed cutting tool materials
For high-speed cutting, the correct cutting effect can be obtained by selecting the tool material and the permissible cutting conditions for different workpiece materials. Accordingly, for the high-speed cutting of aluminum alloys, cast irons, steels and alloys and heat-resistant alloys which are widely used in production at present, the developed tool materials mainly include: diamond, cubic boron nitride, ceramic cutters, coated cutters and TiC. (N) based cemented carbide tools (cermets).
Diamond cutter
Diamond tools are divided into natural diamond and synthetic diamond tools. Natural diamond has the highest hardness and thermal conductivity in natural materials. However, due to the high price, processing and welding are very difficult. Except for a few special applications (such as watch precision parts, lighting parts and jewelry engraving), they are rarely used as cutting tools in the industry. With the development of high-tech and ultra-precision machining, such as micro-mechanical micro-parts, nuclear reactors and other high-tech mirrors, navigation gyros in missiles or rockets, computer hard disk chips, accelerator guns and other ultra-precision parts Processing, single crystal natural diamond can meet the above requirements. In recent years, a variety of chemical mechanisms for grinding diamond tools and a protective atmosphere brazing diamond technology have been developed, making the manufacturing process of natural diamond tools relatively simple. Therefore, in the high-tech application field of ultra-precision mirror cutting, natural diamond has played a role. Important role.
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Roof Rock Wool Insulation Board
Yu Ou Nuo Roof Rock Wool Insulation Board are suitable for fire prevention, heat preservation and heat insulation of external walls and roofs. Rock wool board is a kind of external wall thermal insulation material, with good thermal insulation effect, low thermal conductivity, high A1 fire grade, non flammability, strong high temperature shrinkage resistance, high quality and low price, which is convenient for construction and installation.Rock Wool Boardis an inorganic fiber board made of basalt as the main raw material through high temperature melting processing , is widely used in petrochemical, textile metallurgy, power transportation, construction agriculture and other fields.
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