Composite machining center with hot displacement constraint skid revolving joint portion macro/micro drive

Abstract

The invention discloses a macro-micro dual-drive combined machining center which has a skid and rotation joint portion with thermal walking constraint, comprising a lathe body, upright posts, beams, X-axis parts, swing B-axis parts, rotation C-axis parts, a two-axes paralleling mechanism, a milling electro-spindle, Y-axis parts, Z-axis parts and a lapping-polishing electro-spindle, wherein the two-axes paralleling mechanism realizes the movement of a virtual W axis and a virtual V axis by adopting dual drive, a micro-drive actuator deforming guide way is adopted between a macro-micro dual-drive macro-motion table and a macro-micro dual-drive micro-drive table, the X-axis parts, the Y-axis parts and the two-axes paralleling mechanism movement pairs adopt combined slide seats which are combined by a cast iron working slide seat, a thermal walking constraint joint portion and a granite bearing slide seat, and the B-axis, the rotation C-axis and the two-axes paralleling mechanism rotation pairs adopt skid and rotation joint portion mechanisms. The combined machining center has a combined machining function that the five axes of X, B, C, V and W are interlinked so as to mill the complex moulding surfaces of hard parts at high speed and the five axes of X, B, C, Y and Z are interlinked so as to lap and polish the complex moulding surfaces of hard parts with high accuracy.

Description

technical field [0001] The invention belongs to the technical field of precision machine tools, and relates to a high-speed precision numerical control machine tool, in particular to a compound machining center with macro-micro drive of a thermal displacement constrained rolling-sliding-rotation junction. Background technique [0002] The traditional machine tool adopts the principle of complete serial connection, which has the advantages of large working space and simple machine tool motion algorithm. Its disadvantages are that the motion errors of each axis are accumulated, the cantilever structure is weak, the moving mass is large, and the feed rate cannot be too high. The advantages of fully parallel machine tools are small mass of moving parts, high speed, high specific stiffness, and no accumulation of motion errors; the disadvantages are small working space and complex motion algorithms. Combining series and parallel principles, the hybrid principle machine tool with...

AI Technical Summary

Problems solved by technology

The two-axis and three-axis parallel mechanisms belong to the parallel mechanism with few degrees of freedom. The advantages of the parallel mechanism with few degrees of freedom: ① maintain 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 , ③In principle, the motion errors of each branch of the parallel mechanism do not accumulate, and the precision is high, but due to the many passive joints (passive motion pairs) of the parallel mechanism, due to design and manufacturing reasons, the actual implementation often fails to achieve the theoretical goal High-precision, few-degree-of-freedom parallel mechanism Compared with a six-degree-of-freedom complete parallel mechanism, it 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

For the above situation, if the micro-movement slide table uses a two-dimensional planar flexible hinge mechanism to determine its relative pose of the macro-motion slide table, the micro-motion slide table cannot bear large loads or full loads; the guiding accuracy cannot be guaranteed; it is used for micro-drive actuation The force condition of the actuator is bad, which will affect the working performance of the actuator and even cause damage; the motion accuracy will also be affected

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