Ultrahigh-precision positioning rotary worktable with zero-clearance cam and worm transmission effect

Abstract

The invention discloses an ultrahigh-precision positioning rotary worktable with a zero-clearance cam and worm transmission effect, and belongs to the field of mechanical manufacturing equipment. The ultrahigh-precision positioning rotary worktable comprises an indexing and pre-tightening transmission mechanism, a positioning disc, a rotary worktable, a rotary worktable clamping mechanism and a case. The indexing and pre-tightening transmission mechanism is a two-stage cam and worm transmission mechanism, an input end of a primary transmission mechanism of the indexing and pre-tightening transmission mechanism is connected with a servo motor by an elastic coupling, an output spindle of a secondary transmission mechanism of the indexing and pre-tightening transmission mechanism is connected with the rotary worktable by the positioning disc, and the rotary worktable clamping mechanism clamps the rotary worktable by the aid of expansion force of a worktable expansion ring of the rotary worktable clamping mechanism. The ultrahigh-precision positioning rotary worktable has the advantages that the traditional worm wheel and worm transmission is replaced by the aid of the indexing and pre-tightening two-stage cam and worm transmission mechanism, so that transmission clearance is reduced and is zero, and positioning errors due to transmission clearance can be effectively reduced; the expansion force acts on the rotary worktable via the expansion ring of the rotary worktable clamping mechanism, so that the rotary worktable can be fixed without deflection, and ultrahigh-precision rotary worktable positioning effects can be comprehensively guaranteed.

Description

technical field [0001] The invention relates to an ultra-high-precision positioning rotary table with no-gap cam and worm transmission, which belongs to the field of mechanical manufacturing equipment. Background technique [0002] The machinery and equipment manufacturing industry is the cornerstone of a country's industry. It provides important means for the development of new technologies and new products, and is an indispensable strategic industry. With the continuous and rapid development of my country's economy and the urgent need for economic transformation, the machinery manufacturing industry is inevitably moving towards high, refined and cutting-edge levels. Among them, the development of CNC machine tools is very important. The accuracy of CNC rotary table will directly affect the machining accuracy of CNC machine tools. The conventional CNC machine tool rotary table is driven by a servo motor, which is driven by a worm gear-worm transmission device after gear r...

AI Technical Summary

Problems solved by technology

On the one hand, even if a high-precision worm gear-worm transmission mechanism is used, there will inevitably be a transmission gap, which will directly affect the positioning accuracy of the CNC rotary table; on the other hand, the clamping tile device is used to lock the table, Since the clamping shoe does not directly act on the worktable, but clamps the worm gear first, the worktable will still have a small deflection when it needs to be in a static state, which will affect the positioning accuracy of the rotary table

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