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Steady optimal distributing method for geometric accuracy of multi-shaft machine tool

A multi-axis machine tool and machine tool technology, applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve the effect of improving work efficiency and reducing machine tool manufacturing costs

Active Publication Date: 2013-11-13
BEIJING UNIV OF TECH +1
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Problems solved by technology

[0009] In order to solve the above multi-objective optimization problem and solve the defects of traditional optimization methods, NSGA-II, as an improved version of the non-dominated sorting genetic algorithm (NSGA), will be used to solve the optimization problem of the present invention

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  • Steady optimal distributing method for geometric accuracy of multi-shaft machine tool

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Embodiment Construction

[0068] In order to achieve a balance between the cost and precision of the machine tool, the present invention takes a certain type of three-axis vertical machine tool as an example to verify the above-mentioned robust optimization design method. The technical indicators of the three-axis vertical machining center are: the size of the worktable is 320mm×460mm; the strokes of X, Y, and Z are 300mm, 250mm, and 300mm respectively; The fast moving speed is 48m / min; the positioning accuracy is ≦0.003mm in the case of full closed loop, and the repeat positioning accuracy is ≦0.0015mm. Its structure diagram is as follows image 3 . The three-axis machine tool mainly has three translational units of X, Y, and Z axes and a spindle unit. The present invention mainly considers the static error of the machine tool, so the machine tool has 21 geometric errors in total, including six basic errors of X, Y, and Z ( Δx x ,Δy x ,Δz x ,Δα x ,Δβ x ,Δγ x ,Δx y ,Δy y ,Δz y ,Δα y ,Δβ y ,...

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Abstract

Along with increasing demand on machining precision, how to reasonably configure geometric error of a machine tool under the premise of ensuring the machining performance of the machine tool to balance the cost and machining precision is the problem demanding a prompt solution in manufacturing of the machine tool. The invention provides a novel multi-target optimal distributing method for geometric accuracy based on the manufacturing cost and quality loss of parts. The method comprises the following steps of: establishing a comprehensive spatial error model of geometric error of the machine tool by a multibody system theory; establishing a manufacturing cost model of a machine tool part according to the machining characteristic of the machine tool part which affects the geometric error to the maximum extent; meanwhile, combining the quality loss cost to establish a cost-based target function; establishing an optimal model associated to precise level of the part by identifying the geometric error, namely, maximizing European norms of all precision parameter variables as another target function; and realizing optimal distribution through Isight and Matlab integrated and combined with NSGA-II (Nondominated Sorting Genetic Algorithm-II).

Description

technical field [0001] The invention relates to a method for robust and optimal allocation of geometric precision of a multi-axis machine tool, which belongs to the field of machine tool precision design, and in particular to a precision optimization allocation method based on quality loss cost and manufacturing cost. Background technique [0002] CNC machine tool is a high-precision, high-efficiency, high-tech modern electromechanical equipment. As the basis and core equipment of advanced manufacturing technology, it is more and more widely used in mechanical production, and restricts the development of manufacturing fields and various high-tech develop. An important index to measure the design and performance of CNC machine tools is the accuracy of CNC machine tools. As the requirements for machining accuracy are getting higher and higher, how to reasonably configure the geometric error of the machine tool and achieve a balance between cost and machining accuracy under th...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 程强张翠蔡力钢顾佩华罗锐
Owner BEIJING UNIV OF TECH
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