Four-branch swallow-shaped five-axis machining equipment

Abstract

The invention discloses four-branch swallow-shaped five-axis machining equipment. The four-branch swallow-shaped five-axis machining equipment comprises a main shaft, a single swinging head, a moving platform, four linear driving branches, a rack, a first rotary frame and two second rotary frames; the first rotary frame is located in the left and right symmetrical surfaces of the rack and is connected with the rack through a revolute pair; two first linear driving branches penetrate through the first rotary frame, and the middle part and one end of each first linear driving branch are separately connected with the first rotary frame and the moving platform; the axes of four revolute pairs are parallel to one another and are vertical to the rotation axis of the first rotary frame; the two second rotary frames are located on the left and right sides of the rack and are connected with the rack through revolute pairs; two second linear driving branches penetrate through the corresponding second rotary frames; the middle part of each second linear driving branch is connected with the corresponding second rotary frame through the corresponding revolute pair, and one end of each second linear driving branch is connected with the moving platform through a spherical hinge; the single swinging head is arranged on the moving platform; and the main shaft is fixed on the single swinging head. The four-branch swallow-shaped five-axis machining equipment is compact in structure, high in structural rigidity, high in bearing capacity and high in machining precision; and curve surface machining can be realized through five-axis linkage.

Description

technical field [0001] The invention belongs to the field of numerical control machining, in particular to a numerical control five-axis machining equipment. Background technique [0002] The five-axis machining center is a machining center with high technological content and high precision specially used for machining complex curved surfaces. and other industries have a decisive influence. At present, the mechanical structure of the five-axis linkage CNC machining center is mainly composed of series and hybrid forms. Most of the five-axis milling machining centers of series machine tools rely on linear motion in the three directions of X, Y, and Z plus series double swing heads or The two-degree-of-freedom workpiece is mounted on the indexing turntable to provide five degrees of freedom, which results in a series of disadvantages such as low rigidity and low bearing capacity of the five-axis machining center. The parallel mechanism has the advantages of high stiffness-to-...

AI Technical Summary

Problems solved by technology

The patent with the publication number CN1958229A proposes a five-degree-of-freedom parallel-connected CNC machine tool, which uses a parallel mechanism with four telescopic branches to swing the servo shaft in series to realize five-axis linkage; when the position of the universal joint on the fixed platform and the ball joint on the moving platform 1. When the rotation pair is rectangular and the four telescopic branches are of equal length, the parallel mechanism has a singular structure; in order to avoid the singularity of the mechanism, as shown in the drawings of the embodiment of the invention, the position of the hinge seat of the moving platform and the fixed platform is reversed trapezoidal distribution , the two revolving pairs on the motion platform are adjacently arranged on the lower edge of the trapezoid, and the two spherical joints are adjacently arranged on the upper edge of the trapezoid. Although this arrangement is theoretically far away from the singularity point, it is still relatively close to the singularity point. The rigidity of the moving platform is inconsistent in all directions, the stiffness of the torsion around the axis perpendicular to the fixed platform is low, and the adjacent arrangement of ball pairs makes the machine tool less flexible space. The above factors make it difficult to meet the actual requirements of parallel machine tool engineering

Images