Geometric precision and linking speed optimization five-axis linkage smooth interpolation method
A technology of connection speed and five-axis linkage, applied in instruments, computer control, simulators, etc., can solve the problem that the interpolation period is not an integer, etc.
Active Publication Date: 2017-05-10
GSK CNC EQUIP
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[0006] Aiming at the problems existing in the five-axis linkage smooth interpolation of the existing numerical control system, the present invention proposes a five-axis linkage smooth interpolation method with optimized geometric accuracy and joint speed, which does not need to accurately pass through a given path joint point, and can overcome The problem that the interpolation period is not an integer
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[0090] Such as figure 1 As shown, a five-axis linkage smooth interpolation method optimized for geometric accuracy and connection speed of the present invention is applied to a machine tool numerical control system, which includes the following five steps:
[0091] (1) The linear tool route in the machine tool coordinate system is a series of five-axis path connection points M i (X i ,Y i ,Z i ,α i ,β i )(i=0,1,...,n) OK. Each path junction M i Is a five-dimensional vector composed of the coordinates of each axis of the machine tool, including three translational axis coordinates (X i ,Y i ,Z i ) And the coordinates of the two rotation axes (α i ,β i ). Convergence point of two adjacent paths M i , M i+1 Determine the five-axis path segment L i (i=0,1,...,n-1).
[0092] Such as figure 2 , image 3 As shown, the five-axis linkage tool path in the machine tool coordinate system is respectively projected into the translational axis space (Euclidean space formed by three translationa...
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The invention discloses a geometric precision and linking speed optimization five-axis linkage smooth interpolation method, and the method comprises the steps: (1), obtaining a corresponding translation axis path and a rotating axis path according to a five-axis linkage tool path in a given machine tool coordinate system; (2), defining fairing parts and linear parts of the translation axis path and the rotating axis path; (3), carrying out the modeling of a comprehensive fairing error according to the circular arc radiuses and feed speed of the fairing parts of the translation axis path and the rotating axis path; (4), taking linking speed optimization as the target, and calculating the circular arc radiuses and feed speed of the fairing parts of the translation axis path and the rotating axis path; (5), carrying out the interpolation according to a time segmentation method. The method can solve a problem that an interpolation period is not an integral without precise given path linking points, also can avoid the constraint on the feed speed from a path length, can obtain a higher feed speed through introducing an controllable interpolation error, and improves the machining efficiency.
Description
Technical field [0001] The invention relates to the research field of a machine tool numerical control system, in particular to a five-axis linkage smooth interpolation method with optimized geometric accuracy and connection speed. Background technique [0002] The five-axis linkage processing code is generally composed of a large number of first-order discontinuous small path segments, which makes the feed rate fluctuate seriously, or even cannot reach the commanded feed rate at all, which affects the processing quality and efficiency. Therefore, it is necessary to combine smooth interpolation in practical applications. Complementary algorithm. The so-called smooth interpolation means that in the process of interpolation, a certain number of path segments are pre-read to form a pre-processing buffer, which is calculated according to the geometric characteristics of these path segments (including the length of the path segments, the corners, etc.) The optimized connection speed ...
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CPCG05B19/404G05B2219/35015
Inventor 冯景春周世伟陈绍磊
Owner GSK CNC EQUIP