High-speed, high-precision processing technology and equipment new trends
Efficiency and quality are the mainstays of advanced manufacturing technology. High-speed, high-precision machining technology can greatly improve efficiency, improve product quality and grade, shorten production cycle and increase market competitiveness. To this end, the Japanese Advanced Technology Research Institute will list it as one of the five major modern manufacturing technologies. The International Association for Industrial Engineering (CIRP) has identified it as one of the central research directions in the 21st century. In the passenger car industry, the production cycle of 300,000 vehicles per year is 40 seconds per vehicle, and multi-species processing is one of the key issues that must be addressed for car equipment. In the aviation and aerospace industry, the parts processed are mostly thin-walled. With thin ribs, the rigidity is very poor, and the material is aluminum or aluminum alloy. These ribs and walls can be processed only when the high cutting speed and cutting force are small. The method of “hollowing out” large-scale aluminum alloy billets is used to manufacture large parts such as wings and fuselage to replace multiple parts. Through a large number of rivets, screws, and other connection methods, the strength, stiffness, and reliability of the components are improved. . All of these require high-speed, high-precision and high-flexibility for processing equipment. The
From the perspective of the EMO2001 exhibition, the high-speed machining center's feed rate can reach 80m/min, or even higher, and the airspeed can reach around 100m/min. Many automakers in the world, including China's Shanghai General Motors Corporation, have adopted a part of the production line consisting of a high-speed machining center to replace the combined machine tools. CINCINNATI's HyperMach machine tool feed rate is up to 60m/min, fast is 100m/min, acceleration is 2g, spindle speed has reached 60,000r/min. It takes only 30 minutes to machine a thin-walled aircraft part, and the same part takes 3 hours in a general high-speed milling machine and 8 hours in an ordinary milling machine; the spindle speed and acceleration of a twin-spindle lathe from DMG, Germany, reach 12*1000r/mm. 1g. In terms of machining accuracy, the machining accuracy of ordinary CNC machine tools has been increased from 10μm to 5μm, precision machining centers have been increased from 3 to 5μm to 1 to 1.5μm, and ultra-precision machining precision has begun to enter the nanometer level (0.01μm). . In terms of reliability, the MTBF value of foreign numerical control devices has reached more than 6,000 hours, and the MTBF value of the servo system has reached more than 30,000 hours, showing very high reliability. In order to achieve high-speed, high-precision machining, the supporting functional components such as electric spindles and linear motors have been rapidly developed and the application fields have been further expanded.