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1、High-speed machining and demand for the development of itHigh-speed machining is an important component of contemporary advanced manufacturing technology and has high-efficiency, high-precision and high surface quality, and other features. This article presents the technical definition of the curren
2、t state of development of Chinas application fields and the demand situation。High-speed machining is a new high-tech which is oriented to the 21st century, high-efficiency, High-precision and high surface quality as a basic feature, in the automobile industry, aerospace, Die Manufacturing and instru
3、mentation industries gained increasingly widespread application, and has made significant technical and economic benefits. contemporary advanced manufacturing technology an important component part。HSC is to achieve high efficiency of the core technology manufacturers, intensive processes and equipm
4、ent packaged so that it has a high production efficiency. It can be said that the high-speed machining is an increase in the quantity of equipment significantly improve processing efficiency essential to the technology. High-speed machining is the major advantages : improve production efficiency, im
5、prove accuracy and reduce the processing of cutting resistance。The high-speed machining of meaning, at present there is no uniform understanding, there are generally several points as follows : high cutting speed. usually faster than that of their normal cutting 5 -10 times; machine tool spindle spe
6、ed high, generally spindle speed in -20000r/min above 10,000 for high-speed cutting; Feed at high velocity, usually 15 -50m/min up to 90m/min; For different cutting materials and the wiring used the tool material, high-speed cutting the meaning is not necessarily the same; Cuttingprocess, bladed thr
7、ough frequency (Tooth Passing Frequency) closer to the machine-tool - Workpiece system the dominant natural frequency (Dominant Natural Frequency), can be considered to be high-speed cutting. Visibility high-speed machining is a comprehensive concept。1992. Germany, the Darmstadt University of Techno
8、logy, Professor H. Schulz in the 52th on the increase of high-speed cutting for the concept and the scope, as shown in Figure 1. Think different cutting targets, shown in the figure of the transition area (Transition), to be what is commonly called the high-speed cutting, This is also the time of me
9、tal cutting process related to the technical staff are looking forward to, or is expected to achieve the cutting speed。High-speed machining of machine tools, knives and cutting process, and other aspects specific requirements. Several were from the following aspects : high-speed machining technology
10、 development status and trends。At this stage, in order to achieve high-speed machining, general wiring with high flexibility of high-speed CNC machine tools, machining centers, By using a dedicated high-speed milling, drilling. These equipment in common is : We must also have high-speed and high-spe
11、ed spindle system feeding system, Cutting can be achieved in high-speed process. High-speed cutting with the traditional cutting the biggest difference is that Machine-tool-workpiece the dynamic characteristics of cutting performance is stronger influence. In the system, the machine spindle stiffnes
12、s, grip or form, a long knife set, spindle Broach, torque tool set, Performance high-speed impact are important factors。In the high-speed cutting, material removal rate (Metal Removal Rate, MRR), unit time that the material was removed volume, usually based on the machine-tool-workpiece whether Proc
13、essing System chatter. Therefore, in order to satisfy the high-speed machining needs, we must first improve the static and dynamic stiffness of machine spindle is particularly the stiffness characteristics. HSC reason at this stage to be successful, a very crucial factor is the dynamic characteristi
14、cs of the master and processing capability。In order to better describe the machine spindle stiffness characteristics of the project presented new dimensionless parameter - DN value, used for the evaluation of the machine tool spindle structure on the high-speed machining of adaptability. DN value of
15、 the so-called axis diameter per minute speed with the product. The newly developed spindle machining center DN values have been great over one million. To reduce the weight bearing, but also with an array of steel products than to the much more light ceramic ball bearings; Bearing Lubrication most
16、impressive manner mixed with oil lubrication methods. In the field of high-speed machining. have air bearings and the development of magnetic bearings and magnetic bearings and air bearings combined constitute the magnetic gas / air mixing spindle。Feed the machine sector, high-speed machining used in the feed drive is usually larger lead, multiple high-speed ball screw and ball array of small-diameter silicon nitride (Si3N4) ceramic ball, to reduce its centrifuga
