Five-freedom-degree parallel-serial numerically-controlled machine tool

Abstract

The invention discloses a five-freedom-degree parallel-serial numerically-controlled machine tool which comprises a stand column, a machine tool body, a working table and a machining unit. The machining unit comprises a supporting frame, a movable platform, a first branch chain, a second branch chain, a third branch chain and a positioning head, wherein a three-freedom-degree parallel mechanism is formed by the supporting frame, the first branch chain, the second branch chain, the third branch chain and the movable platform, the two-freedom-degree positioning head is further connected on the movable platform in series, when the machine tool is used for machining, the machining unit is driven by five driving devices to adjust gestures at the tail end, and therefore five-shaft linkage machining is achieved. The five-freedom-degree parallel-serial numerically-controlled machine tool is simple in structure, large in ratio of a working space to the mechanism size and high in rigidity and accuracy, has five freedom degrees, can achieve five-shaft linkage, and is suitable for numerically-controlled machining of complicated spatial curved surfaces and low in cost.

Description

technical field [0001] The invention relates to a numerical control machine tool, in particular to a five-degree-of-freedom hybrid numerical control machine tool. Background technique [0002] In the past ten years, parallel / hybrid CNC machine tools have been a hot topic in the field of CNC machine tool research at home and abroad. Parallel / hybrid machine tools have many advantages compared with traditional CNC machine tools. The traditional machine tool has a series and open-chain structure. In order to realize five-axis machining, two more axes need to be added to the traditional CNC machine tool to control the attitude of the tool or the attitude of the workbench, and these axes are arranged in series. Therefore, in When the five-axis is linked, the motion inertia is large, the rigidity is weak, the dynamic performance is poor, and the cutting precision of the end is low. The parallel machine tool is composed of a dynamic platform, a static platform and several simple s...

AI Technical Summary

Problems solved by technology

[0003] According to the existing patent documents CN1958229A, CN2476392A, CN1788899A and CN201744858U, the existing parallel machine tool consists of a static platform, a dynamic platform and several telescopic branch chains. A key problem in these patents is that there are too many of them The use of ball joints leads to low rigidity and low precision of the whole machine

The parallel machine tool described in the existing patent document CN101774128A uses many rods and hinges, has a complex structure, low rigidity, and a small working space

The parallel machine tools described in the existing patent documents CN201324943Y and CN201833184U use a large number of Hooke hinges, three-degree-of-freedom rotary hinges or spherical hinges, resulting in complex structures and poor rigidity of the whole machine

[0004] According to the existing patent documents GB2173472 (or EP0200369, US4790718), SE8502327 (or US4732525), CN1524662, CN1709657A, CN1439492A, it is known that there is a type of spatial hybrid robot with a positioning head for CNC machining, including several axially extending Long or shortened adjustment device; one end of the adjustment device is connected to the fixed frame through a Hooke hinge, and the other end of the adjustment device is connected to the moving platform through a three-degree-of-freedom hinge, resulting in a lower overall rigidity of the mechanism and lower load The ability is poor; some patents also add a passive branch chain rigidly connected to the moving platform, and connected to the fixed frame through the Hooke hinge to limit certain degrees of freedom of the positioning head

In this type of robot structure, the passive branch chain not only makes the mechanism complicated, but also has a large number of moving components, which makes it easy to interfere during the movement and reduces the working space

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