Control method for improving angular-displacement accuracy of rotary-table bearing

Abstract

The invention relates to a control method for improving the angular-displacement accuracy of a rotary-table bearing, wherein the rotary-table bearing (3) comprises an outer ring (3.1), a radial roller (3.2), a shaft ring (3.3), an inner ring (3.4), a connecting bolt (3.5), a holding frame (3.6) and an axial-thrust cylindrical roller (3.7). The shaft ring is provided with a short graduated slot (3.3.1) and a long graduated slot (3.3.2) and is plated with chromium. A supporting seat (1) is processed according to the shape characteristic of the rotary-table bearing (3), two transmission-type grating sensors (4) and a reflection-type grating sensor (2) are installed on the supporting seat, a leading-out wire of each sensor is connected with a conditioning-circuit box (5), the transmission-type grating sensors are used for monitoring the short graduated slot of the shaft ring and performs the action of monitoring the actual deflection quantity of the angular displacement of the shaft ring, and the reflection-type grating sensor is used for monitoring the long graduated slot of the shaft ring and performs the action of a monitoring criteria. The control method is applicable to a rotary table or an index disk for a numerically-controlled machine tool having high requirements for the angular displacement.

Description

technical field [0001] The invention belongs to the technical field of bearings, in particular to a control method for improving the angular displacement accuracy of a turntable bearing. Background technique [0002] The basic structure of turntable bearing 3 see figure 2 .. [0003] The turntable bearing 3 is composed of outer ring 3.1, radial roller 3.2, shaft ring 3.3, inner ring 3.4, connecting bolt 3.5, cage 3.6 and axial thrust cylindrical roller 3.7, and is symmetrically assembled on both ends of the outer ring 3.1 in the width direction. Two sets of axial thrust cylindrical rollers 3.7 are equipped with a set of radial rollers 3.2 on the inner diameter end face of the outer ring 3.1. [0004] The turntable bearing 3 has high precision, high rigidity, and high load-carrying capacity, and is suitable for the rotary table of the machine tool indexing plate or other precision machinery. [0005] If the turntable bearing 3 is applied to the indexing plate of the machin...

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Problems solved by technology

[0010] How to overcome the energization control error of the servo motor or stepper motor and the mechanical transmission error of the worm gear device through the structural improvement of the shaft ring 3.3 and the auxiliary control method surrounding the structural improvement of the shaft ring 3.3 in the above open-loop control mode, so as to To improve the accuracy of the angular displacement of the turntable bearing, there is no relevant report so far

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