Four qualitative changes in the hottest machine to

2022-10-22
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Editor's note: on February 27, Liang xunxi, honorary chairman of China Machine Tool Industry Association, said in a speech in China industry daily. Liang xunxi believes that the technological evolution of world machining belongs to at least four aspects of "qualitative change"

"now, many people ask how enterprises can survive the impact of the financial storm? I personally think that enterprises should start with technology in order to seek development, which is a long-term plan." Liang xunxi, honorary chairman of China Machine Tool Industry Association, said in a speech in China industry daily on February 27. Liang xunxi believes that the technological evolution of world machining belongs to at least four aspects of "qualitative change", while other technological progress mostly belongs to "quantitative change". The so-called "qualitative change" refers to the fundamental difference between innovative thinking and traditional "quantitative change"; The essential difference in principle between the material carrier and the routine; The depth of benefit and influence formed in human production activities

he said, "to care about the technological progress in China's machining field is bound to be linked to the development of the world, because technology and science have no national boundaries and promote each other. In the past 30 years, China has been actively participating in the four major qualitative changes in the world's manufacturing technology and equipment field, and has made important contributions, and some aspects have even entered the forefront of the world. The fundamental source of these four qualitative changes is the change of manufacturing tools - machine tools. "

the emergence of intelligent production tools

recently, at a high-level "strategic industry selection" Symposium of relevant national departments, Liang xunxi put forward a point of view, "the intelligent characteristics of machine tools as production tools are the epoch-making development of human production tools, and mankind is welcoming the arrival of an era of intelligent production tools"

Liang xunxi explained that the emergence of CNC machine tools marked the beginning of the development of machine tools towards intelligence. Looking back on the development history of machine tools, it has been more than 50 years since the first CNC machine tool appeared in 1952, including 30 years towards maturity and 20 years towards large-scale application. Especially in recent years, the further increase of intelligent functions of machine tools in succession marks a qualitative change in the development of machine tool technology

in recent years, Yamazaki Mazak company in Japan has successively developed intelligent spindle vibration control, intelligent thermal barrier, intelligent anti-collision barrier and language prompt; Okuma company of Japan has developed "thinc intelligent digital control system" and so on. It shows that with the development of technology, the intelligent functions of machine tools as production tools will become more and more advanced and more. The development of human intelligent production tools is in the ascendant and has a bright future

breakthrough in reverse thinking of processing methods

rapid prototyping technology is a processing method that has emerged in recent 20 years. It is a major breakthrough in reverse thinking of processing methods and a great change in processing principles

it is fundamentally different from the traditional method of "removing materials" that has been used until now. In fact, rapid prototyping technology is the opposite. It uses "material accumulation molding" or "material accumulation" method and "additive manufacturing method" to achieve the prototype of the workpiece

rapid prototyping technology uses composite paper, high polymer, metal powder, superalloy, composite ceramics, casting sand and other raw materials for processing; Using electric heating, laser beam and electron beam as energy sources, it is manufactured according to layered entity (LOM); Fused deposition molding (FDM), ultraviolet laser curing (SLA), laser zone sintering (SLS) and other methods to achieve prototype part modeling, which is used to quickly assess the correctness and feasibility of part design, and greatly shorten the development and production cycle of the whole machine. In addition to being used in manufacturing machine parts prototypes and molding sand cores, it has even entered related fields such as three-dimensional art body shaping and human medical bionic parts (such as bone joints) manufacturing. This is the latest product of the integrated development of computer science, new material science and new energy science

in this field, China's state-owned and private scientific research institutions and enterprises such as Huazhong University of science and technology, Tsinghua University, Xi'an Jiaotong University, Tongji University, Chinese Academy of Sciences, Shanghai liantai, Beijing ruikeda, Wuhan Binhu Electromechanical Technology Industry Co., Ltd. have actively invested. The products developed have entered the world's advanced level, and the products put into the market have a wide variety, with an annual output of hundreds of sets, and the technology has been exported to Singapore

transformation of machine tool structure

in the past 20 years, the emergence of a "parallel structure" machine tool has revolutionized the design of machine tools in the world. "Parallel structure" is completely different from the innovative reinforced polyethylene foaming (EPE) solution developed by Dow. It has a traditional machine tool structure. Because of its excellent performance, the bed structure of traditional machine polyurethane materials can be attributed to series structure. All structural geometric accuracy errors, force transmission and stiffness loss will form series accumulation and become fatal weak links

the parallel structure machine tool moves the spindle head through the simultaneous movement of the multi bar structure in space to realize the machining action. Compared with the series structure, the parallel structure has a series of main advantages, such as simpler, higher stiffness, better dynamic performance and so on

over the past 20 years, more than 20 teams from more than a dozen countries around the world have been engaged in research and development in this field. Among them, Swedish Tricept company has supplied more than 400 sets of products, which are widely used in Airbus, Boeing, general motors and caterpillar large construction machinery enterprises. In addition, several teams have exhibited the tricks of combination, and the trial products have been displayed respectively

although the reports on parallel structure machine tools have decreased in recent years, the development of parallel structure machine tools has not stopped. According to Liang xunxi, he contacted some teams engaged in the research and development of parallel machine tools, such as Toyota Gongji of Japan, Okuma, index of Germany, and learned that these foreign R & D institutions and enterprises with certain technical strength are still accelerating the research of parallel machine tools and trying to improve their performance

Liang xunxi said that China's machine tool industry also has fiveorsix industry university research consortiums carrying out research and development work in this area. Among them, the parallel structure variety (six bar structure) jointly developed by Harbin Measuring and cutting tools group and Harbin Institute of technology has been mass produced in five sets and has been successfully applied to the blade processing production line of Harbin Turbine Plant; The gantry type "hybrid" structure (i.e. series and parallel hybrid) machine tool developed by Qiqihar second machine tool group in cooperation with Tsinghua University is an independent concept in China, and has been successfully used in the manufacturing of large-scale hydropower station equipment in Harbin electric machinery plant

variation of tool concept

the traditional machining process system is generally composed of machine tool - (fixture) - workpiece, and the tool links are nothing more than turning tools, milling tools, boring tools, drill bits, broaches, grinding wheels, stamping dies, dies and the like according to the traditional classification. All these tools are entities with certain hardness, such as tools made of high-speed steel, tool steel, cemented carbide, cubic boron nitride, single crystal and polycrystalline diamond, ceramics and other materials

later, oxyacetylene high-temperature cutting methods appeared, followed by electrical energy discharge machining methods, electrochemical machining, laser machining methods, electron beam machining methods, ion implantation methods, photolithography, etc. until recent years, the high-pressure water jet (commonly known as "water jet") machining methods belonging to "cold energy" and "soft medium" appeared in a new attitude, combined with multi coordinate numerical control technology, The trial production cycle of new products in the automotive industry has been greatly shortened. At present, China has Nanjing waterknife Co., Ltd. and Nanjing craft equipment manufacturing Co., Ltd. to provide products to the market

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