A five-axis linkage machine tool with four rotations and one translation

Abstract

The invention relates to a four-rotation and one-translation five-shaft linkage machine tool, comprising a machine tool bed. The top surface of the machine tool bed is fixedly provided with a workbench; the workbench is provided with two first rotation devices which are respectively provided with a turn plate 1; one side of each turn plate 1 is provided with a box body; the box bodies are provided with second rotation devices which are respectively provided with a turn plate 2; one of the turn plates 2 is clamped with a workpiece to be machined and the other turn plate 2 is provided with a translation guide mechanism; the translation guide mechanism is provided with a fixing seat; and the fixing seat is fixedly provided with a milling mechanism. An axis 1 of each first rotation device is perpendicular to an axis 2 of each second rotation device. An axis 3 of the milling mechanism is perpendicular to the axis 2 of each second rotation device which is connected with the milling mechanism. The four-rotation and one-translation five-shaft linkage machine tool disclosed by the invention has the beneficial effects of: simple structure of the machine tool and flexibility in arrangement, lower motion mass and good dynamic characteristics, less additional motion and high machining efficiency, as well as good dynamic characteristic matching property and high machining precision in curved profile.

Description

technical field [0001] The invention relates to a four-rotation-translational five-axis linkage machine tool. Background technique [0002] At present, most of the traditional five-axis linkage machine tools are machine tools with a series structure. The series machine tool is a machine tool with multiple axes linked and connected in series. It is a machine tool with simple mathematics and complex mechanism. Rotating or swinging coordinate axes in a rotary mode. Its working principle is: three translational linear coordinate axes make the cutting point of the tool shift to the spatial position of the point to be processed, and two rotary or swinging coordinate axes rotate the tool or workpiece at a certain angle to reach the position of the tool. The axis coincides with the direction of the normal vector of the point to be processed or is controlled to form a certain angle to facilitate cutting of the side edge of the tool—generally called the tool axis vector in CAM; under...

AI Technical Summary

Problems solved by technology

[0005] For the traditional three-translational two-rotation five-axis machine tool structure, with the continuous development of high-speed cutting, the structural rigidity of the traditional tandem mechanism construction platform and the high-speed mobile platform have gradually become the bottleneck of technological development. The main shortcomings are as follows: : ①The traditional three-translation two-rotation five-axis machine tool series mechanism tool can only be fed along the fixed guide rail, and the freedom of tool operation is relatively low. In order to obtain a good tool cutting posture, the additional travel of each linear motion axis is relatively large, and the processing efficiency is not high; ②In order to obtain better rigidity, the machine tool has a larger structure, the mass of the moving parts of the machine tool is larger, and the processing flexibility and motion characteristics of the equipment are not enough. For the processing of curved surfaces, especially curved surfaces with large curvature changes, the following error is large. Insufficient efficiency and precision

[0006] Although the six-bar parallel mechanism represented by the Stewart platform has unique characteristics and advantages, there are still many problems that need to be further studied and solved before the actual application. The main problems are: ①The description of the effective working area is complex and constrained It is difficult to solve the problem; ②It is very difficult to solve the positive solution of kinematics, there is no analytical solution, there is kinematic coupling and multi-solution; ③It is difficult to calculate the dynamics, and the influencing factors are very complicated; ④The manufacturing accuracy, motion and cost of spherical joints and other issues It affects its application, and the existence of kinematic coupling leads to high requirements for components and control precision; ⑤ Due to the presence of singular points in its work space, and the need to consider avoiding geometric interference between drive rods, the actual work space of the machine tool is narrow

Said limitations affect its application and promotion

[0007] From the perspective of application, although the parallel machine tool has been greatly developed in the past 20 years, from the perspective of technical maturity and actual processing effect, there are still poor rigidity (mainly depends on the manufacturing and assembly accuracy of the Hooke hinge), complex mechanism, Due to the inherent disadvantages of high cost, the promotion in machine tool manufacturing and machining manufacturing industry is very limited

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