| CNC gantry boring and milling machine, as one of the main equipment formetal cutting processing, due to its superior after with advanced processingtechnology, modular combination of function extension ability, obtained thecustomers at home and abroad and the wide use and rapid development of theenterprise.In the enterprise with the main equipment, CNC gantry boring andmilling machine occupies a larger proportion.Domestic CNC gantry boring andmilling machine is common in use process boring and milling head spindletransposition, positioning accuracy is not high, the existence of the problem notonly reduces the degree of automation of CNC gantry boring and milling machine,increase the machine maintenance time, and frequent transposition, positioningfailure reduces the production efficiency.This paper expounds the performance characteristics of CNC gantry boring andmilling machine, technology development present situation, improve thesignificance of spindle transposition, positioning accuracy, this paper introduces theCNC gantry boring and milling machine spindle locating mechanism of dislocation,the composition, function and meet the requirements.Proposed the wuhan heavymachine tool plant CNC gantry boring and milling machine in boring and millinghead spindle transposition, existing products positioning problems in the process.Inview of the problem and the reason of the current status of the product from themain transmission mechanism, the accuracy of spindle, the spindle signalmeasurement, feedback, etc were analyzed and discussed.In view of the main drivechain to achieve both main motor power, the spindle drive the cutting tool, at thesame time, both the degree in chain to ensure the accuracy of the high degree index,achieve these two requirements, is bound to the design of main drive chain has ahigh accuracy and precision requirements.In practice, dividing accuracy is notideal.Therefore, put forward the main drive chain and chain dividing separatedesign train of thought;Because of boring and milling head spindle rotationaccuracy out-of-tolerance problem, by using the method of improve the spindledrive decorate a form, increase automatic dividing device to improve;For spindlemeasurement device installation drive side gap and positioning parts processing isnot easy to guarantee, will affect the positioning accuracy of cylindrical positioningface instead of conic positioning, in the design of the structure to optimize, reach the purpose of improving the transmission, and introduces a eliminate mechanicalstructure to improve the spindle transposition of transmission clearance, positioningaccuracy.Finally, the improvement measures are applied to the product verified.The study found that the machine tool main drive chain and dividing separatingthe transmission chain and transmission chain can effectively improve the machinetool spindle transposition, positioning accuracy. Using the new material, newprocess can obviously improve the precision of machine tool spindle assembly. |
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