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Driven by the automotive industry-centric manufacturing equipment investment and export growth, the demand for tool products is growing, and tool manufacturers are expanding their production capacity at home and abroad. As global cost competition intensifies, calls for high value-added, high-efficiency production are increasing. In order to adapt to the rapid production development trend of short delivery time and low cost, the key is to realize long-time automatic operation processing with minimal production equipment. An effective way to promote the rationalization of the production site is to introduce a composite cutting technology that integrates multiple processes and a high-speed milling machine that can cut workpiece materials including hardened steel at high speed and high precision.
Advanced cutting technology such as compound cutting and high-speed hard milling is the core to realize the production method of processing parts with high efficiency, fastness and flexibility (suitable for different varieties and different batches of production) with minimal production equipment. However, any cutting method is inseparable from the selection of the right cutting tool and the determination of a reasonable tooling technique. In recent years, with the increase in the speed of machine tools, the advancement of high-precision machining technology, and the increase in the number of difficult-to-machine materials, the development of tool materials (ceramics, hard alloys, TiC/TiN-based cermets, coated hard alloys, etc.) Very significant.
Changing tool materials
The tool material must meet the following conditions: high hardness, wear resistance, high strength against high resistance to shear and vibration, good high temperature red hardness, easy heat treatment and processing. Among the tool materials, cemented carbide is characterized by a small decrease in hardness at high temperatures. The coated cemented carbide is based on a tungsten carbide-based cemented carbide, and is coated with one or more layers of titanium carbide (TiC), titanium nitride (TiN), and aluminum oxide (Al2O3). Since the coating material is superior to the substrate in resistance to sintering, abrasion, and heat resistance, high-speed cutting can be performed at a cutting speed exceeding the substrate. In addition, due to the small coefficient of friction of the coating, the life of the tool can be extended.
The development of high-speed milling technology requires good wear resistance, heat resistance and toughness of the tool material. Therefore, many coatings have been applied on the ultrafine particle cemented carbide substrate to improve the cutting performance. End mills and other products. Some ultrafine particle cemented carbide materials have an average particle size of less than 1 μm, which significantly improves the toughness and bending strength of the tool base.
The composite coating is a combination of a plurality of coating materials, and a multilayer film coating is applied layer by layer to improve the cutting performance of the tool. Coating materials In addition to titanium carbide and titanium nitride for high-speed cutting of steel, diamond and cubic boron nitride are now used. Recently, silicon-based nano-coating tools with nano-level fine grain coatings have appeared, which can be used for high-speed cutting of high-hardness steel and high-performance processing of mild steel.
The ever-changing tool materials promote the development of tool technology
The basic requirement for cutting is to produce high quality products quickly and cost-effectively. This requirement is closely related to the high precision, high efficiency, and low cost of cutting. In recent years, cutting technology has developed rapidly in the fields of high-speed milling and micro-shape cutting. With the development and application of new engineering materials and the further miniaturization and precision of components, tool manufacturers are actively developing high-efficiency tools for various machining applications.