Large-stroke high-rigidity series-parallel hybrid machine tool with reconfigurable characteristic

Abstract

The invention relates to a large-stroke high-rigidity series-parallel hybrid machine tool with the reconfigurable characteristic. The large-stroke high-rigidity series-parallel hybrid machine tool comprises a fixed working table, an X-direction movement unit, a Y-direction movement unit, a lifting adjusting device, three driving branches with same structures, a movable platform and a main shaft head. A special clamp is installed on the fixed working table, and the X-direction movement unit and the Y-direction movement unit are each composed of a rack and a servo driving unit. The lifting adjusting device comprises three passive branches with the same structures and a middle active branch, the structure dip angle of a parallel structure can be adjusted, and the parallel structure has the reconfigurable characteristic. The three driving branches with the same structures are connected with the lifting adjusting device and the movable platform, and one-dimensional movement and two-dimensional movement can be achieved through the space closed loop parallel mechanism. The large-stroke high-rigidity series-parallel hybrid machine tool has the beneficial effects of good structural symmetry, high rigidity, large working space, high posture capacity, good in dynamic performance and the like; meanwhile, the beneficial effects of a series machine tool and a parallel machine tool are achieved at the same time; and the large-stroke high-rigidity series-parallel hybrid machine tool can be used for five-axis machining of large heterogeneous part complex surfaces.

Description

technical field [0001] The invention belongs to the field of numerical control machine tools, and in particular relates to a novel series-parallel hybrid machine tool with reconfigurable characteristics that can satisfy the free machining of complex curved surfaces with large special-shaped structures in the aerospace field. Background technique [0002] For the equal-thickness machining of large-scale heterogeneous and complex space free-form surfaces in the aerospace field, manual milling is still used at present, which is bound to have high costs, long cycles, and processing quality depends on the proficiency of workers, making it difficult to achieve precision processing Requirements: The traditional three-coordinate series machine tool has the advantages of good flexibility and large work space. Although it is widely used in industry, it is easy to generate error accumulation at the output end of the actuator because of its mechanical structure. The accuracy is poor, th...

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Problems solved by technology

[0002] For the equal-thickness machining of large-scale heterogeneous and complex space free-form surfaces in the aerospace field, manual milling is still used at present, which inevitably has high costs, long cycles, and processing quality depends on the proficiency of workers, making it difficult to achieve precision processing Requirements: The traditional three-coordinate series machine tool has the advantages of good flexibility and large work space. Although it is widely used in industry, it is easy to generate error accumulation at the output end of the actuator because of its mechanical structure. The accuracy is poor, the overall stiffness is not high, and the movement of any joint will drive the movement of other joints. Considering the loads of the motors at all levels, the dynamic response speed of the output end is very slow, which is difficult to meet the ideal requirements in the field of high-end intelligent manufacturing equipment. Effect; the traditional five-axis linkage machine tool, on the basis of the three-coordinate serial machine tool, is connected in series with a two-degree-of-freedom swing head or cooperates with a two-degree-of-freedom rotary table to process parts, but it is suitable for processing parts with small structural dimensions, and cannot meet large-scale Processing of special-shaped components

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