Three-degree-of-freedom parallel mechanism and machine tool adopting same

Abstract

The invention relates to a three-degree-of-freedom parallel mechanism and a machine tool adopting the mechanism, belonging to the field of machinery manufacturing. The machine tool comprises the three-degree-of-freedom parallel mechanism, a portal frame and a base, wherein the portal frame is installed on the base through a screw rod and a guide rail; and the three-degree-of-freedom parallel mechanism is installed on the portal frame through screw rods and guide rails in pillars on two sides of the portal frame. The three-degree-of-freedom parallel mechanism comprises a fixed platform, a movable platform, a first branch, a second branch and a third branch. The structures of the first branch and the second branch are exactly the same; and a three-degree-of-freedom movement form of the movable platform is achieved by the synergic movement of the first branch, the second branch and the third branch. The three-degree-of-freedom parallel mechanism in the machine tool provided by the invention has the characteristics of being simple and compact in structure, high in stiffness and load capacity, and small in mass of moving components, and achieving the high-speed movement, and the five-axis hybrid machine tool adopting the mechanism can meet the machining requirements for complex thin-walled parts in aviation.

Description

technical field [0001] The invention belongs to the field of mechanical manufacturing, in particular to a three-degree-of-freedom parallel mechanism and a machine tool using the mechanism. Background technique [0002] Since the 1980s, large-scale gantry-type five-axis linkage CNC milling machines have been more and more widely used in the processing of aircraft structural parts. The workbench, beam and spindle parts of the gantry machine tool realize the movement of the X, Y and Z axes, plus the swing fork or universal swing head, realize the two rotary motions of the A / C axis or the A / B axis, forming five Axis linkage CNC machine tools. The advantage of the swing fork type or universal swing head is that the deflection angle of the spindle is relatively large, and the five-sided machining of rectangular parts can be realized. Although the swing head can achieve high rotation speed and acceleration on a single axis, the tool space orientation speed is still relatively low....

AI Technical Summary

Problems solved by technology

[0005] However, the existing spindle heads of parallel mechanisms have fewer configurations, and some configurations have defects such as high assembly accuracy requirements and small working space, resulting in fewer spindle head configurations with engineering practical value, which hinders the development of parallel mechanism spindle heads. And the development of the five-axis linkage CNC machine tool equipped with the spindle head

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