Curve Fitting Approach of Saddle-Shaped Curve for Automated Welding/Cutting

2011 ◽  
Vol 211-212 ◽  
pp. 935-938
Author(s):  
Xin Cheng Tian ◽  
Xiao Hong Deng
Keyword(s):  
Curve Fitting ◽  
Numerical Control ◽  
Interpolation Algorithm ◽  
Core Technology ◽  
Straight Line ◽  
Fitting Algorithm ◽  
Trajectory Interpolation ◽  
Cartesian Coordinate ◽  
Cutting System ◽  
Curve Fitting Algorithm

Curve fitting, or interpolation algorithm is core technology for Computer Numerical Control (CNC) systems. A saddle-shaped curve is formed by intersection of two tubes. The trajectory interpolation of saddle-shaped curve is usually carried out through approximating the curve as segments of straight line for automated CNC welding/cutting. This paper proposes a new saddle curve curve fitting algorithm for automated welding/cutting system with non-Cartesian coordinate system. Simulation of the direct curve fitting algorithm has demonstrated that the algorithm has high curve interpolation precision and high feedrate stability.

A Novel Trajectory Control Algorithm for Intersection Seam Automated Welding

2011 ◽  
Vol 219-220 ◽  
pp. 284-287
Author(s):  
Xing Lin Yi ◽  
Xin Cheng Tian
Keyword(s):  
Control Algorithm ◽  
High Reliability ◽  
Interpolation Algorithm ◽  
Cartesian Coordinate System ◽  
Circular Arc ◽  
Straight Line ◽  
Curve Interpolation ◽  
Trajectory Interpolation ◽  
Cartesian Coordinate ◽  
Welding System

A saddle-shaped curve is formed by intersection of two tubes. This paper proposes a new saddle curve interpolation algorithm for automated welding system with non-Cartesian coordinate system. The trajectory interpolation of saddle-shaped curve is usually carried out through approximating the curve as segments of straight line/circular arc for intersection seam automated CNC welding. Simulation of the direct interpolation algorithm is carried out to testify its effectiveness and superiority. With this algorithm, it is demonstrated that the chord error is within the allowable limits and the algorithm has high reliability.

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