The machine tool is developing in the direction of high speed, high efficiency and compound processing, and the motion control associated with it is getting more and more attention.
Strong guarantee for the rapid development of machine tools
Mr. Heinrich Willms: In the past few years, machine tool development has been moving towards high speed, high efficiency and compound direction, and this trend will continue.
At present, in order to meet the development needs of high-speed composite machine tools, the development of ball screws has also taken a new direction. The development of the latest machine tool use fields has put forward new requirements for the structural design of ball screws, such as hollows designed to reduce their own weight. The ball screw, designed to increase the relative running speed, has a left and right screw, special nut and other nut structure for any machine tool.
Figure 1: Mr. Heinrich Willms, General Manager, BLIS Ball Screws GmbH, Germany
The emergence of high speed ball screws is mainly achieved by changing the geometry and material of the reverser track. The ball screw runs at speeds of up to 100 m/min, and even at such high operating speeds the machine remains extremely rigid and consumes less energy.
In the past, the manufacture of large machine tools was done manually. Today's large machine tools, such as the marine engine manufacturing equipment and power generation units of the marine industry, can be realized by digital control. In this field, there is an urgent need for an efficient, extra long, large diameter ball screw. At present, large machine tools for producing 20m ball screws have appeared in the world. This laid the foundation for the new development of ball screws in the field of ultra-high loads.
Mr. Ogura Victory: The current development trend of machine tools is undoubtedly high-speed and composite. THK has been speeding up the mobile phone bed since the LM guide was first developed in 1972. Changing the traditional sliding guide mechanism into a rolling guide mechanism has increased the moving speed of the mechanism by more than two times. The LM guide has become an essential component in current high-speed machine tools. The LM Guide itself is also progressing year by year, and now it can achieve high speed operation above 60m/min.
One of the elements of machine tool operation is the necessary cutting thrust and cutting reaction force in machining. The motor acts as a power source to rotate the ball screw shaft, which is converted into an axial drive. At this time, the ball screw has two functions: one is driving action; the other is to bear the cutting reaction force while generating the cutting thrust required for machining. The role of the load. The pitch of the ball screw varies with the lead (moving distance per revolution). The pitch circumferential force of the motor is converted into an axial force by the pitch, which also acts as a reducer, so that a small motor can also generate a large axial force. The ball screw is indeed a very important mechanical component.
Figure 2: Mr. Ogura Victor, Manager of Beijing Branch of Tiye Tech (China) Investment Co., Ltd.
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