Pre-tightening structure of main shaft with rectangular attached cutting head

Abstract

The invention relates to a pre-tightening structure of a main shaft with a rectangular attached cutting head. A first bearing component is arranged in a bearing base, the bearing base is tightly connected on a box body by screws, a third spacing ring, a bevel gear and a shaft sleeve are sequentially assembled on the main shaft, wherein the bevel gear and the main shaft are connected through a spline. The pre-tightening structure is characterized in that a lock nut is arranged at the position of a thread of the main shaft, two deep groove ball bearings, a fourth spacing ring and a fifth spacingring constitute a second bearing component which is arranged in the bearing base of the box body, the fourth spacing ring in the second bearing component is matched with the main shaft; a third flange cover is fastened on the main shaft by the screws, and the second bearing component is fixed at a shaft shoulder of the main shaft. The pre-tightening structure provides the pre-tightening force forthe installation of the main shaft, thereby shortening the transfer distance of the pre-tightening force, reducing the link of error accumulation, being capable of ensuring the rotary motion of the main shaft, avoiding the situation of uneven loading of the pre-tightening force caused by serial screwing the screws and improving the processing precision of the rectangular attached cutting head.

Description

technical field [0001] The invention relates to a pre-tightening structure of a main shaft of a right-angled additional cutting head, in particular to the pre-tightening of the main shaft of a right-angled additional cutting head, and belongs to the technical field of mechanical structures. Background technique [0002] With the rapid development of my country's machinery industry, especially the development of heavy industry, there is an increasing demand for high-precision metal processing equipment such as pentahedron gantry machining centers. Pentahedron gantry machining centers are developed on the basis of gantry machining centers. A multi-functional CNC machine tool, through automatic replacement of various additional cutting heads, can realize multi-faceted processing of large mechanical parts. Usually, all or most of the processing procedures of large mechanical parts can be completed in one clamping, thus greatly reducing Improve production efficiency, which can impr...

AI Technical Summary

Problems solved by technology

But in this structure, the acting stroke of the pretightening force is long, and the number of acting parts is large. While transmitting the pretightening force, these parts also accumulate machining errors to the end face of the spindle, which is manifested by a large jump in the diameter of the end face of the spindle, which affects the right-angled attachment. Cutting head accuracy; at the same time, due to the use of screw pre-tightening, the sequence of tightening will also affect the accuracy of the spindle

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