Dual-drive skid revolving joint portion dual-shaft parallel high-speed accurate mainshaft head

Abstract

The present invention discloses a double-drive rolling-sliding revolving combination part two-axis parallel-connection high-speed precise mainshaft head which comprises an electric mainshaft and two-axis parallel-connection mechanism. The two-axis parallel-connection mechanism is composed of a movable platform and two branch structures which are connected with the movable platform. The electric mainshaft is fixedly connected with the movable platform. Each of two branch structures comprises two moving pairs that are installed in parallel. The two moving pairs are connected with a sliding platform which is respectively connected with one end of each of two connecting rods through two rotary pairs. The other ends of two connecting rods are connected with the movable platform respectively through the rotary pairs. Two rotary pairs of a branch pair in two branch structures are respectively installed with the rotary pair corresponding with the other branch structure in parallel. The mainshaft head of the invention not only has a high speed but also improves the force bearing condition of rotary pair so that the rotary pair has higher guiding stiffness and precision.

Description

technical field [0001] The invention belongs to the technical field of precision machine tools, and relates to a spindle head of a high-speed, precision numerically controlled machine tool, in particular to a two-axis parallel high-speed precision spindle head with a dual-drive rolling-sliding rotary joint. Background technique [0002] The spindle head mechanism of a machine tool refers to an independent component composed of the spindle assembly that realizes the main movement and the feed assembly that directly drives it for feed movement. The number of movement axes of the feed assembly in the independent component is called the axis number of the spindle head mechanism. The traditional machine tool is based on the principle of complete tandem, and its spindle head mechanism is also based on the principle of tandem. The main advantage of the series principle mechanism is that the working space is large and the motion control algorithm is simple; the main disadvantage is ...

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Problems solved by technology

The main advantages of the series principle mechanism are large working space and simple motion control algorithm; the main disadvantages are the accumulation of motion errors of each axis, weak structural rigidity, large moving mass, and the feed speed cannot be too high

[0003] The advantage of the six-axis fully parallel mechanism is that the mass of the moving parts is small, the speed is high, the specific stiffness is high, the motion errors of each branch are not accumulated, and the precision is high; the disadvantage is that the working space is small (especially the rotary motion range is small), and the motion algorithm is complicated.

[0004] The two-axis parallel mechanism belongs to the parallel mechanism with less degrees of freedom. The advantages of the parallel mechanism with less degrees of freedom: ① maintains the characteristics of high speed of the complete parallel mechanism, ② compared with the complete parallel mechanism, the parallel mechanism with less degrees of freedom has larger working space, ③ principle As mentioned above, the motion errors of each branch of the parallel mechanism do not accumulate, and the precision is high. However, due to the large number of passive joints (passive motion pairs) of the parallel mechanism, which is limited to design and manufacturing reasons, the actual implementation often fails to achieve the high precision in principle. Compared with the six-degree-of-freedom parallel mechanism, the parallel mechanism with six degrees of freedom has fewer passive joints and relatively higher precision

Disadvantages of the parallel mechanism with less degrees of freedom: compared with the complete parallel mechanism, the force condition of the mechanism becomes worse

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