Prestretching structure of numerical control machine tool ball screw pair and method

Abstract

The invention relates to a prestretching structure of a numerical control machine tool ball screw pair and a method. A servo feeding motor end ZARN combination bearing is a fixed end; a conical roller bearing and a deep groove ball bearing at the other end form a stretching end; the ball screw pair is prestretched through rotating a nut; the stretching quantity is equal to the difference between the reading number of a dial indicator at the stretching end and a dial indicator at the fixed end, so that the heat deformation of a lead screw in operation is eliminated beforehand, and the influence on the precision of a machine tool by the heat deformation of the machine tool is reduced and eliminated; and as the support rigidity of a ball screw mechanism is improved, the operation precision, the stability of a transmission system and the vibration resistance are improved, and the life is prolonged.

Description

technical field [0001] The invention relates to the technical field of numerical control machine tools, in particular to a pre-stretching structure and method of a ball screw pair of a numerical control machine tool. Background technique [0002] The performance of CNC vertical lathe depends to a large extent on the structure and qualitative and quantitative assembly of the feed transmission system. The feed mechanism of the machine tool is an important part of the position control in the CNC machine tool, which has a direct impact on the accuracy of the machine tool system. The feed drive mechanism of modern CNC machine tools mainly includes ball screw drive, rack and pinion drive, linear motor drive and parallel virtual axis drive. There are big differences. Because the ball screw has the advantages of high transmission efficiency, high positioning accuracy, long service life, good synchronization performance, and transfer reversibility, the most common and most widely u...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in order to overcome the thermal deformation of the ball screw caused by the temperature rise of the ball screw during the operation of the prior art when performing numerical control machining, the thermal deformation of the ball screw directly leads to the progress of the machine tool. To solve the problem that the rigidity of the system is reduced and the feed accuracy is reduced, which affects the processing effect, a pre-stretching structure and method for a ball screw pair of a CNC machine tool is provided

Images