Parallel type three-shaft mainshaft head structure without accompanied movement

Abstract

The invention relates to an associated movement-free parallel three-axis spindle head structure and belongs to the field of numerically controlled lathes. The structure comprises a dynamic platform, a static platform, a first branch mechanism, a second branch mechanism and a third branch mechanism, wherein the dynamic platform and the static platform are used for mounting a spindle, and the first branch mechanism; the second branch mechanism and the third branch mechanism are used for connecting the dynamic platform and the static platform. The first branch mechanism comprises a first input piece, a first connecting piece, a sliding pair and two turning pairs. The second branch mechanism comprises a second input piece, a second connecting piece, a sliding pair and two turning pairs. The second branch mechanism comprises a third input piece, a third connecting piece, a sliding pair and two spherical hinges or Hook hinges. The sliding pairs of the three branch mechanisms are under drive. The structure realizes rotation without associated movement and contributes to high-precision measurement, thereby achieving high precision. And the structure has the characteristics of high rigidity, low motion mass, high dynamic performance, simple structure, low cost, easy manufacture, relatively high flexibility, contribution to track planning and control, and the like.

Description

technical field [0001] The invention belongs to the field of numerical control machine tool manufacturing, and particularly relates to a parallel three-axis spindle head structure that can be used independently and combined with other devices for composite processing. Background technique [0002] In modern aircraft design, advanced overall structural design is widely used, which not only shortens the processing and assembly cycle and logistics chain, but also reduces the weight of structural parts. Due to the technological characteristics of large size, thin wall, easy deformation, difficult machining and high precision of parts, five-axis simultaneous machining is the main processing method for aerospace structural parts. The five-axis linkage can make the tool cut with the best geometric shape, which not only has high finish and surface roughness, but also greatly improves the efficiency. In recent years, since the traditional five-axis linkage processing equipment has b...

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Problems solved by technology

In general, this type of spindle head structure has certain defects and deficiencies in mechanism kinematics characteristics, manufacturing and application without exception, mainly reflected in: 1. This type of spindle head structure has unavoidable accompanying motion , that is, the trajectory of the center of the moving platform is not a straight line when the two rotational movements are realized, resulting in complex kinematics, which requires the machine tool to compensate its accompanying movement in real time; 2. The accompanying movement greatly increases the difficulty of calibration, and the difficulty of calibration is limited 3. In engineering applications, the manufacturing and assembly process of this type of spindle head structure is complicated, which does not meet the current manufacturing process level in China, which limits the popularization and application of this type of spindle head

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