At the beginning of 2018, Japan's Hitachi Metals Co., Ltd. invited the Key Laboratory of Materials Electromagnetic Process Research of Northeastern University to coat titanium alloy processing tools. It hopes to enhance the durability of the tool by virtue of the technological advantages of Northeastern University. This is the first time that Northeastern University has processed titanium alloy high-speed cutting tools for foreign companies. It has not only broken the technical blockade of Chinese titanium alloy high-speed cutting tools, but also successfully achieved counter-attacks, marking that China's new high-speed cutting tools for titanium alloys have reached international standards. Leading level.
Titanium is an important structural metal widely used in the manufacture of high-end equipment such as aerospace, marine engineering and medical equipment. Titanium alloy is not only difficult to prepare, but also difficult to cut in the manufacturing process of the product, which has become one of the bottlenecks restricting the development of China's high-end equipment manufacturing industry.
When the hardness of titanium alloy is greater than HB350, it is difficult to cut. When it is less than HB300, it is prone to sticking and it is difficult to cut. In the actual production process, in order to prevent the cutting temperature from being too high, most of the titanium alloy processing enterprises in China adopt the traditional processing method of “low speed, large depth of cut and small feedâ€, and the tool wears quickly. Foreign high-quality knives have restricted exports to China. The cruel reality makes China's titanium alloy cutting speed and processing efficiency far behind the developed countries such as Europe and the United States.
The development of new tools for efficient cutting of titanium alloys has become a common concern in the field of high-end equipment manufacturing and metal cutting research. In 2012, Prof. Wang Qiang, Key Laboratory of Materials Electromagnetic Process Research of Northeastern University, led the “High-speed Cutting Process and Tool Material Research for Typical Parts of Aerospace High-Strength Lightweight Materials†and won the “High-end CNC Machine Tool and Basic Manufacturing Equipmentâ€. Funded for major science and technology projects.
The research team, based on the major national science and technology major projects, and the Institute of Metal Research of the Chinese Academy of Sciences, jointly carried out high-speed cutting technology for aerospace and titanium alloy materials and high-performance tool materials. In view of the difficult-to-cut properties of titanium alloys such as "low thermal conductivity, low modulus of elasticity, and high chemical reactivity", the research team focused on teamwork and studied these problems one by one.
After three years of experiments, the research team successfully developed a new type of high-speed cutting tool for titanium alloy with international leading level. The tool adopts ultra-fine grain gradient cemented carbide tool material and functional composite nano-tool coating technology with grain size less than 0.6μm on the surface, which successfully overcomes the problems of high cutting efficiency and low cutting efficiency when the reaction temperature is high. It effectively solves the problems of chipping and the like caused by easy bonding between the tool and the titanium alloy, and lays a solid foundation for the development of China's high-end equipment manufacturing industry.
In 2014, the overall ultra-fine grained carbide milling cutter, ultra-fine-grain carbide milling cutter and surface-modified carbide milling insert developed by the research group were carried out in the center of titanium alloy in a certain aircraft industry (Group) Co., Ltd. Machining of the wing butt strap. Among them, the overall ultra-fine grained carbide milling cutter achieves stable cutting at a cutting speed of 160 m/min, and the processing efficiency is improved by 42.2%. The practical application shows that the coated milling insert developed by Northeastern University achieves stable high-speed machining of titanium alloy parts.
The ultra-fine grain gradient functional carbide inserts developed by the research team in 2015 were tested by the National Tool Quality Supervision and Inspection Center. Under the conditions of finishing titanium alloy at a cutting speed of 100m/min, the cutting performance exceeded that of similar tools at home and abroad. The processing efficiency is increased by more than 50%. Under the condition of rough machining of titanium alloy at a cutting speed of 60m/min, the cutting performance is comparable to that of similar tools at home and abroad, and the processing efficiency is increased by more than 50%. The test of the National Tool Quality Supervision and Inspection Center shows that the tool performance developed by Northeastern University exceeds the level of similar products at home and abroad, the overall technology has reached the international advanced level, and some of the cutting tool products are internationally leading, breaking the long-term technological monopoly of foreign companies.
With the continuous development and improvement of new tools for high-speed cutting of titanium alloys, the tools and technology developed by the research team have won the favor of many companies. The surface-modified cemented carbide tool has been verified by the rough machining of titanium alloy by Shenzhen Haizhou CNC Machine Tool Co., Ltd., and the wear rate is reduced by 64% at a cutting speed of 70m/min, which truly achieves the effect of cutting "titanium". , has won wide acclaim from tool manufacturers and users.
In the specific and production practice, the research team has gradually established a high-speed cutting process specification for typical titanium alloy parts, significantly improving the cutting speed and processing quality, and effectively reducing the processing cost. At present, Shenyang City and Shitai General Titanium Industry Co., Ltd. and Hitachi Metals of Japan have expressed strong interest in the new high-speed cutting tools for titanium alloy in Northeastern University, and hope to further strengthen cooperation.
Professor Wang Qiang, the head of the research group, said that a high-end equipment manufacturing industrial park between China and Germany (Shenyang) signed a strategic cooperation agreement with Northeastern University, and the high-speed cutting coating tool project landed in Sino-German Park. The new high-speed cutting tools for titanium alloys that are about to enter the mass production stage will greatly promote the development of high-end manufacturing enterprises such as airplanes and automobiles, and create huge economic and social benefits.
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