Ball screw pre-stretching mechanism and pre-stretching method

Abstract

The invention discloses a ball screw prestretching mechanism and a prestretching method thereof. The ball screw prestretching mechanism comprises a ball screw pair, a front locking module and a back locking module, wherein the front end and the back end of the ball screw pair are respectively fixed by the front locking module and the back locking module; the back locking module includes a back end bearing, a back end bearing sleeve and a back end bearing base coating the ball screw pair in sequence from inside to outside; the back end bearing sleeve is coated with a stretching unit; the stretching nut is near the outer side of the back end bearing base; and a rotation preventing pin is inserted in the back end bearing base, and is butted against the outer surface of the back end bearing sleeve after penetrating through the back end bearing base. The ball screw prestretching mechanism can obtain the beneficial effect of preventing the blockage phenomenon of a ball screw by a bearing inner ring due to a bearing locking nut stretching the ball screw when locking a ball screw bearing.

Description

technical field [0001] The invention relates to a pre-stretching mechanism and a pre-stretching method thereof, in particular to a ball screw pre-stretching mechanism and a pre-stretching method thereof. Background technique [0002] When the ball screw is working, it will generate heat. The heat causes the ball screw to expand thermally, thereby increasing the lead, affecting the transmission and positioning accuracy. For the ball screw that requires very precise transmission, it is necessary to compensate for thermal expansion. The pre-stretching of the ball screw is a commonly used compensation method. [0003] The disadvantages of the ball screw pre-stretching of the motion axis on the machining center at present are: [0004] Since the contact angle of the ball screw is a thrust contact ball bearing of 60 degrees, under the action of the locking force, the bearing will generate a radial force through the contact angle of the bearing, and the outer ring of the bearing w...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies in the above-mentioned technologies, the object of the present invention is to provide a ball screw pre-stretching mechanism and a pre-stretching method thereof, so as to prevent the bearing lock nut from stretching the ball screw while locking the ball screw bearing. The phenomenon that the ball screw is "locked" by the inner ring of the bearing produced by the screw, really achieves the purpose of pre-stretching the ball screw, solves the problem of the accuracy drop of the ball screw due to the thermal expansion of the ball screw during operation, and alleviates the problem. When the slenderness ratio is too large, the sagging and vibration of the ball screw due to its own weight

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