On the morning of September 26th, the Northwestern University of Technology & Zhuzhou Diamond Aviation Parts High Performance Cutting Joint Laboratory was established and a grand laboratory unveiling ceremony was held at the Northwestern University of Technology Friendship Campus.
After the unveiling ceremony, Northwestern Polytechnical University and Zhuzhou Diamond Cutting Tool Co., Ltd. jointly held the “Aerospace Tool Application Seminarâ€, inviting well-known experts and research institutes of aviation manufacturing enterprises to focus on aviation advanced technology and exchange and promote the major special achievements of aviation tools. To help improve the level of high-efficiency cutting technology in China.
Wang Shequan, deputy general manager of Zhuzhou Diamond (hereinafter referred to as Zhun Drill) gave a special speech on the tool products of Zhunzhu and its application in the aviation field. At present, among the tools used in the field of aerospace manufacturing, foreign brands are the mainstays, and domestically produced tools account for 36% of the total annual consumption of tools. There are few applications of domestically produced tools. In the final analysis, there are problems in processing efficiency, processing quality, processing technology and cooperation. In response to these problems, the company drilled into the characteristics of the titanium alloy, high-temperature alloy and aluminum alloy materials, cutting mechanism, cutting process optimization, etc., and improved the company's tool products. Its grooving cutters, milling cutters for titanium alloys, composite cutters, indexable broaching systems and interchangeable head milling cutters meet the processing requirements of line parts and improve production efficiency.
Professor Zhang Dinghua from Northwestern Polytechnical University reported on the polymorphic evolution model of tool wear and virtual sensor monitoring methods. The key construction of domestic aero-engines is insufficient in terms of control, control, and control stability. From the perspective of tools, we are looking for reasons. On the one hand, we pay insufficient attention to the cutting edge. Tool wear is the most time-varying factor in the machining of difficult-to-machine materials, directly affecting the stability of the machining process and the integrity of the surface of the part. On the other hand, there is a lack of effective tool condition monitoring and control methods. To solve this problem, the research team established a machine tool energy consumption model, which decomposed the influence of interface parameters on the cutting coefficient and the influence of the flank wear state. The establishment of a multi-state tool wear evolution model to achieve the detection and identification of tool wear by improving the working parameters of the cutting force model.
Aviation manufacturing companies dedicated to processing difficulties breakthrough
Next, Liu Zhiwu, chief technical expert of AVIC Xi'an Aviation Power Co., introduced the technical requirements for the manufacture of aero-engine shaft parts. Mr. Liu Zhiwu first introduced the structure of the large bypass ratio engine. He introduced that the disc/shaft is the key and important rotating part of the engine. The related shaft parts are often due to their large aspect ratio, complex structure and special material. More difficult to process. Then, Mr. Liu Zhiwu introduced the technical requirements and tooling requirements for the manufacture of aero-engine shaft parts. The technical requirements are mainly in the aspects of manufacturing conformity, anti-fatigue manufacturing, low stress and anti-deformation. The requirements for the machining tool system generally have the following aspects: wear resistance, high toughness, good cutting performance, design and manufacture of special structural shank with high efficiency damping function, digitally controlled tool system, special The design and manufacture of a comprehensive tool for the structure, an efficient cutting tool that meets the requirements for surface integrity control.
The overall impeller blade of the aero-engine is characterized by thin blades, poor rigidity, large material removal, and difficult processing. To process these parts, high requirements are placed on the tools. Chief of China Aerospace Southern Industry Co., Ltd. (hereinafter referred to as Southern Industry) Expert Zheng Xue said that the company uses a conical wave-blade ball-end milling cutter in the titanium alloy integral impeller and blade disc processing, which is four times more efficient than the straight-handle corn milling cutter. At present, the needs of aerospace manufacturing enterprises for domestic tool companies are: providing tool models and parameters for cutting physical simulation, establishing a database of tool cutting parameters based on part features, and developing series of high-precision, high-efficiency, high-reliability tools. .
Titanium alloys, superalloys and stainless steels are commonly used materials in aerospace components. These materials are difficult to process and require advanced processing techniques and equipment. Mr. Zhao Ming, an expert at Shenyang Liming Technology Center, combines actual production conditions with difficult-to-machine materials. The advanced technology required is described in detail. Advanced processing technology includes high-speed cutting, ultra-precision, and integration of machine, electricity, light, sound, magnetism, cold, heat and chemistry. At present, these advanced processing technologies are developing towards precision, high efficiency, limit, intelligence and green processing environment, automatically generating parts processing plans and preliminary processing parameters, and real-time optimization and adjustment of machining parameters according to workpiece shape changes. The fault is self-diagnosing, self-excluding, and self-repairing.
College theory is linked to reality, and new technologies are constantly being developed
Professor Liu Zhanqiang from Shandong University gave a special report on the impact of cutting tools on the surface integrity of aerospace parts. The cutting tool has an influence on the geometrical quality and surface roughness of the surface of titanium alloy and nickel-based alloy. It is found that the influence of the tool structure on the geometrical characteristics of the machined surface integrity is as follows: when the tool flank texture direction is perpendicular to When the chip flow direction, the friction coefficient of the chip contact surface is reduced to the greatest extent, and the obtained surface roughness value is the smallest. The increase in the radius of the tool nose increases the depth of the plastic deformation layer on the machined surface. In addition, the influence of the tool material on the geometrical characteristics of the machined surface integrity is manifested by the fact that the coating results in a rough surface roughness of the tool and a blunt radius of the cutting edge of the tool, resulting in a greater surface roughness of the machined tool.
Professor Liu Xianli, Dean of the School of Mechanical and Electrical Engineering of Harbin University of Science and Technology, gave a report on the topic of "Mechanical Cutting and Machining Mechanism and Reliability of Ring-Shaped Shaft Parts" and combined with current practice research. Professor Liu analyzed in detail the various tool wear, damage and failure modes in the material machining of the coil ring shaft parts, and gave several reference curves for the tool failure limit map, which provided a reference for the cutting parameter setting. At the same time, Professor Liu also shared the research and experimental analysis on the stability of the cutting process of the coiled shaft parts, as well as the research and experimental analysis of the machined surface integrity of the coiled shaft parts.
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