Parallel machine tools, also known as virtual axis machines or parallel robots, are high-tech products produced by the combination of robot technology and machine tool technology. The international academic and engineering circles have attached great importance to the research and development of parallel machine tools, and have successively introduced several prototypes with similar structures and different names. This paper introduces the research process of parallel machine tools in detail, and shares the latest achievements of domestic and foreign research with readers. The article further explores the research direction of parallel machine tools. At the CIMT exhibition held in April this year, Harbin Measuring Tool Group CNC Equipment Co., Ltd. exhibited a new type of parallel structure machine tool LINKS-EXE700 with new breakthrough significance. The parallel machine tool is characterized by further simplification of the structure, increasing the processing range, covering the space x-axis direction 2m, the y-axis direction 1m, the z-axis direction 0.5m, the action is fast, and the rapid feed of the x and y axes reaches 125 m/min respectively. Acceleration 3g, z-axis direction 45m/min, acceleration 1g, rigidity and precision improvement, five-axis linkage CNC programming and routine use, can process pentahedron, in the case of special clamping of the workpiece, it can also be processed on six sides. This is currently not possible with any machine tool structure. After different functions are configured, it can be widely used in aerospace, aviation, automotive, and mold industries for cutting, grinding, welding, riveting, burring and assembly. It can be used in a single machine or as a production line. The structure of a parallel machine is completely different from all conventional machines. The traditional machine tool structure moves in Cartesian coordinates along three coordinate lines and rotates in series around the three coordinates to form the motion path of the required tool. All geometric accuracy errors, force transmission and stiffness loss will be It is cumulative in series. In the nearly two-year parallel structure machine tool, the spindle head is moved by moving the multi-rod structure in space at the same time. Compared with the series structure, it has a series of advantages such as simpler, higher rigidity and better dynamic performance. About two or thirty companies are engaged in R&D in this area, and seven or eight teams in China's machine tool industry are conducting R&D work. Next page Rubber Sleeve / Bush / Sheath / Cover Neway Rubber Products Co., Ltd. , http://www.lxrubbers.com
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Research process of parallel machine tools
Parallel Kinematic Machine (PKM), also known as virtual axis machine or parallel robot, is a high-tech product produced by the combination of robot technology and machine tool technology. It has high precision, high rigidity, high speed, high acceleration and high flexibility. High flexibility, high thrust and light weight. In 1994, Ingersoll and G&L of the United States exhibited parallel machine tools for the first time at IMTS. Since its first appearance on IMTS, it has been hailed as “the 21st century machine tool†and has become the most vital new member of the machine tool family. This new type of machine tool completely breaks the concept of the traditional machine tool structure, abandoning the tool guide mode of the fixed guide rail, and adopts the multi-rod parallel mechanism drive, which greatly improves the rigidity of the machine tool, and greatly improves the machining precision and the processing quality.
In addition, due to the increase in feed rate, high-speed, ultra-high-speed machining is easier to achieve. Because of its high rigidity, high load carrying capacity, simple mechanical structure, low manufacturing cost, and high degree of standardization, this machine tool has been successfully applied in many fields, and has received extensive attention in the academic community. The hybrid CNC machine tool consisting of parallel and series connection not only has the advantages of parallel machine tools, but also has more practical value in use.
With the continuous development of high-speed cutting, the structural rigidity of the traditional tandem mechanism construction platform and the high speed of the mobile station have gradually become the bottleneck of technology development, and the parallel platform has become the best candidate. Parallel working platforms have the following features and advantages over series machines.
Simple structure and low price
The number of mechanical parts of machine tools is greatly reduced compared with the series construction platform. It is mainly composed of general components such as ball screw, Hooke hinge, ball joint and servo motor. These common components can be produced by specialized manufacturers, so the manufacturing and inventory cost ratio of this machine is the same. The traditional machine tool for functioning is much lower and easier to assemble and handle.