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Chengfei CNC Factory has a complete range of CNC machining equipment, which can complete the production and processing tasks of various large, medium and small complex and precise structural parts such as titanium alloy. 
Chengfei CNC Factory undertakes the numerical control processing tasks of titanium alloy, aluminum alloy, composite material and stainless steel structural parts.
The parts processed are mainly frames, beams, siding and joints, and nearly 100,000 parts are delivered each year. 
Walter's corn milling cutter F2338-100080 has a maximum depth of cut of up to 50mm and a maximum cut width of 76mm.
The resulting metal removal rate is up to 340 cm 3 /min, and the processing efficiency is significantly improved. 
With Walter's 3-blade integrated tool, the feed rate of the high edge strip is increased to 5400mm/min, and the processing efficiency is increased by more than 30%. 
The cooperation between Chengfei CNC Factory and Walter has lasted for more than ten years, surpassing the general cooperation relationship.
Advanced cutting technology helps efficient machining
AVIC Chengdu Aircraft Industry (Group) Co., Ltd. is a large-scale enterprise directly under the China Aviation Industry Corporation. It is a research and production base for aviation weapons and equipment, a major base for the export of aviation weapons and equipment, and an important manufacturer of civil aircraft parts. CNC machine processing factory (referred to as "Chengfei CNC Factory") is a major structural parts production branch of Chengfei Company. The CNC machining equipment is complete, and can complete various large, medium and small complex and precise titanium alloys. The production and processing tasks of structural parts have the ability to design and manufacture various types of molds and non-standard equipment. After years of development, Chengfei CNC Factory has realized the application of elbow processing, titanium alloy shaped groove processing and external internal cold cutting tool technology, and realized the deformation control and precise manufacturing of large titanium alloy integral frame parts for the first time in China.
The "Second-generation giant positive and negative electron collider drift chamber body--BESIII drift chamber" successfully manufactured by the Institute of High Energy Physics of the Chinese Academy of Sciences is a true reflection of the high level of Chengfei CNC machining technology. This part is difficult to manufacture and has the highest precision. It is made up of 16 precision wire end panels, which are connected by inner chamber tube, connecting flange, step connecting ring and outer tube. The outer barrel material is a composite material, and the large end surface, the inner chamber and the step are aluminum alloy materials. On the big end plate, there are 20,934 small holes, 218 large holes and 1048 threaded holes. In the words of the Chinese Academy of Sciences experts, it is the loss of a piece of dust that will affect its accuracy. The successful manufacture of the drift chamber body enables the Beijing positive and negative electron collider to be successfully transformed, which narrows the gap between high-energy physics research in China and developed countries by 25 years, and is a perfect display of Chengfei CNC machining technology.
Aircraft structural parts
The structural part of the aircraft is the main force-receiving part of the aircraft. Its shape is related to the theoretical shape of the aircraft's curved surface shape, air duct shape, and wing body shape. The angle inside the part and the shape change greatly. These parts are CNC machining at home and abroad, especially five-axis linkage machining. CNC machining parts account for about 85% of all machined parts; the overall structural parts are machined from thick plates, and the material removal rate is over 90%. Therefore, the amount of machining is extremely large. At the same time, in order to reduce the weight of the aircraft, the web and wall thickness of the structural parts are getting thinner and thinner. The thickness of the web is usually about 1.5mm, which is very easy to deform during processing, which increases the processing difficulty of the parts; the aircraft structural parts are mainly used. Force components, assembly coordination surfaces, intersection holes and other precision requirements are high to meet the needs of precise assembly, such as the highest precision of the web reaches ± 0.1mm, more than double the previous generation aircraft. The aviation integral structural parts have the characteristics of large size, thin wall, easy deformation, difficulty in cutting and high precision of parts.
In addition, with the gradual improvement of the performance of the new generation of fighters, new high-performance materials are continuously introduced. High-strength and difficult-to-machine materials and low-density lightweight materials have become the main materials of aviation structural parts. The structural materials are gradually made of aluminum alloys. The situation is changed to aluminum alloy, titanium alloy and composite material.
In recent years, Chengfei CNC has undertaken CNC machining tasks for structural components such as titanium alloys, aluminum alloys, composite materials and stainless steel. The parts processed are mainly frames, beams, siding and joints, and delivered nearly 100,000 per year. The parts cover two types of products, military aircraft and civil aircraft. The size of the parts is as large as 4000mm×2000mm, as small as 100mm×100mm, and the minimum dimension of the parts is only 1mm. The products are characterized by a wide range of materials, large size spans, high precision requirements, and high requirements for CNC machining. As an efficient and precise digital cutting technology, CNC machining has become the main means of mechanical machining of complex structural parts of aircraft. More than 50% of the machining work of aircraft structural parts is completed by CNC machining.
High-speed machine tools drive efficient machining
Equipment plays a decisive role in the level of CNC machining, directly affecting product quality. The equipment mentioned here contains two meanings, on the one hand, various types of machine tools and fixtures, and on the other hand, the various tool products involved in the machining process. High-speed machining technology not only doubles the production efficiency, improves the machining accuracy and surface quality of the parts, but also effectively solves some difficult problems in low-speed machining, such as the processing of ultra-thin parts and certain special materials (such as fiber). Efficient processing of reinforced plastics, etc.). At present, high-speed machining is still the main way to achieve efficient processing of these aircraft structural parts.
High-speed machine tools are the mainstay of high-speed machining, and tools are the key to high-speed machining. In recent years, high-speed processing related technologies have been rapidly developed. The current application of high-speed spindle, the speed can reach 42000r / min, or even higher, linear motor and torque motor have gradually entered the application stage, the feed speed is faster and faster, reaching 120m / min; the feed acceleration is getting larger and larger, large The feed acceleration of the machine tool reaches 9.81m/s2, and the feed acceleration of the small and medium-sized machine tool reaches 19.62m/s2. The jerk that reflects the rate of change of acceleration has become an important indicator to measure the high-speed performance. The cutting efficiency is getting higher and higher, the aluminum alloy structure The material removal rate of CNC machining is as high as 5000~7000cm3/min.
The DST high-speed machine tool owned by Chengfei CNC has a spindle speed of up to 30000 r/min and a feed acceleration of 2g. The machine has the unparalleled advantages of other machine tools in aluminum alloy processing, and the processing efficiency is nearly double that of ordinary machine tools. DST high-speed machine tool application of vegetable oil micro-cooling lubrication technology has greatly improved the level of CNC machining of Chengfei Company, and has become a highlight of aluminum alloy processing of Chengfei CNC Factory.
Advanced tools for high speed machining
At Chengfei CNC, the finishing of DST high-speed machine tools is almost entirely based on Walter's tool products. For aluminum alloy parts, Walter offers cutting-edge tool solutions that take advantage of the advancement of high-speed machine tools.
The dimensions of an aluminum alloy part are 3m×2m, the material grade is aluminum alloy 7050-T7451, the height of the part is 140mm, the maximum edge height is 90mm, the thickness is only 2.5mm, the edge span is more than 200mm, and the flange has no rigid support, thickness tolerance Within 0.4mm. Due to the large size, the machining deformation is more serious, the height-thickness ratio of the edge strip is as high as 36:1, and the rough finishing of the part needs to be carried out on different machine tools, and the deformation control of the part is very difficult. Especially for high-edge strips, the efficiency of DST high-speed machine tools cannot be fully utilized, and the process is prone to flutter, which makes processing difficult. Through multiple trial cuts, Chengfei CNC Factory cooperates with Walter's 3-blade overall tool JGXLZY3GNT/20*24*60R3 to increase the feed rate of high edge strip to 5400mm/min, and improve processing efficiency by more than 30%. The processing efficiency and processing quality of the high edge strip. For other parts with better rigidity, Chengfei CNC Factory adopts high-speed and large-feed cutting mode, the speed is up to 28000 r/min, the feed speed is up to 10800mm/min, which makes the processing efficiency more than double, and on-site processing The effect is good, and the smooth delivery of the parts is achieved. Prior to the application of DST high-speed machine tools and Walter tools, the aluminum alloy parts were processed on sub-high-speed machine tools with a speed of 9000 r/min and a feed rate of 3600 mm/min. The machining efficiency was low and the machining cycle was long.
Similarly, Walter tools are also effective in titanium alloy processing. Walter's large feed tool has a maximum feed rate of 1500mm/min. The replacement of the previously applied welding tool by Chengfei CNC has increased the machining efficiency by more than 30%, and the workpiece deformation is greatly reduced. For example, a part size is 3.6m×1.8m, and the machining deformation can be successfully controlled within 0.1mm by the comprehensive application of tools and parameters. In addition, Walter's corn milling cutter F2338-100080 has a maximum depth of cut of 50mm and a maximum cut width of 76mm. The resulting metal removal rate is up to 340cm3/min and the processing efficiency is significantly improved.
In order to comply with the ever-increasing demands of aircraft quality and precision, as well as the further compression of production nodes, manufacturers are constantly looking for efficient and high-quality processing methods. For aircraft structural parts, the correct selection and use of tools is sometimes particularly critical, and its quality and processing efficiency often become the primary factors that constrain the processing quality and delivery cycle of parts. Continuously summed up in practice, Chengfei CNC Factory has formed an efficient processing solution for different materials based on the wide range of product materials. For example, for titanium alloy materials, high-efficiency tools such as high-power, high-torque machine tools and carbide tools or coated tools are used. For aluminum alloy materials, high-speed machine tools and high-speed steel or solid carbide tools are used, together with micro-lubrication technology. .
Today, the cooperation between Chengfei CNC and Walter has lasted for more than a decade. In Chengfei CNC, from rough roughing of parts, to finishing, to precision hole machining, both end mills, indexable milling cutters, U-drills, boring tools and disc cutters can be seen. Walter's figure basically covers more than 70% of the tools of Chengfei CNC. Especially in the machining of precision holes, Walter's tools perform well, and their applications cover more than 85%. From the perspective of processed materials, Walter tools are used in aluminum, titanium, stainless steel and hardened steel.
Based on Walter's deep tool development and manufacturing capabilities, as well as a wealth of tool product lines and strong CNC machining engineering capabilities, the cooperation between Chengfei CNC and Walter goes beyond the general cooperation. Whether it is the change of processing materials or the innovation of process technology, whenever Chengfei CNC factory encounters the problem of cutting tools, Walter will give professional technical answers in time. The innovation and release of Walter's cutting tools has also brought advanced cutting concepts to Chengfei CNC machining. High-efficiency and high-quality machining tools make CNC machining difficult and easy, and the processing technology level is gradually improved.
At present, Chengfei Company undertakes a large number of military, civilian and foreign subcontracting production tasks, and the large-scale aviation overall structural parts CNC machining tasks are very heavy. While continuously improving the existing processing technology and processes, Chengfei has set a target of 20 billion yuan per year. The achievement of this goal will inevitably benefit from the strong support of basic equipment and technology. With the superior technical capabilities, the cooperation between Walter and Chengfei CNC will be deeper.