Controllable adjusting and measuring device of ball screw pretightening force and pretensioning amount

Abstract

The invention belongs to the technical field of machinery manufacturing, and particularly relates to a controllable adjusting and measuring device of ball screw pretightening force and pretensioning amount. The pretightening force adjustment of screw nuts is achieved through three pretightening force devices which are of the same structure and are evenly distributed between the two screw nuts, each pretightening force device can conduct pretightening on the two screw nuts through tightening the nuts to press a spring, and the magnitude of the pretightening force can be measured in real time through a pull pressure sensor, so that the controllable adjustment of the pretightening force of the screw nuts can be achieved; the ball screw pretensioning is achieved by the method that tensile force is imposed to a separated mobile platform to drive a ball screw fixing supporting seat to move, and thus drawing force is generated to the ball screw, the pretensioning amount is measured through a dial indicator fixed to the end of the screw, and the magnitude of the drawing force is measured in real time through two pull pressure sensors fixed on the side face of the mobile platform.

Description

Technical field [0001] The invention belongs to the technical field of mechanical manufacturing, and specifically relates to a controllable adjustment and measurement device for the pretension and pretension of a ball screw. Background technique [0002] The ball screw is an important component in the linear drive system of a CNC machine tool, and its accuracy, rigidity, reliability and other properties directly affect the machining accuracy and processing stability of the machine tool. In actual use, due to manufacturing and assembly errors, there is always a certain gap between the ball screw nut and the ball. In addition, during the movement, the screw will be deformed due to the axial load. , So that there will be idle errors during the reverse movement, which reduce the axial transmission accuracy and axial rigidity of the ball screw. In order to solve the above-mentioned problems, the currently commonly used method is to pre-tighten the screw nut to improve the rigidity of...

AI Technical Summary

Problems solved by technology

Now the pre-stretching of the screw is to directly apply tension to the fixed supports at both ends to stretch the screw to the required length. However, after the screw runs for a period of time, the pre-stretch of the screw will be deformed. At this time It will affect the transmission accuracy of the screw and reduce the axial stiffness, so a device that can adjust the pre-stretching amount is required

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