A Tracking-Based Numerical Algorithm for Efficiently Constructing the Feasible Space of Tool Axis of a Conical Ball-End Cutter in Five-Axis Machining

2019 ◽  
Vol 117 ◽  
pp. 102756 ◽  
Author(s):  
Xiangyu Li ◽  
Junxue Ren ◽  
Kai Tang ◽  
Yuke Zhou
Keyword(s):  
Numerical Algorithm ◽  
Tool Axis ◽  
Feasible Space ◽  
Five Axis

Research on Five-Axis Dual-NURBS Adaptive Interpolation Algorithm for Flank Milling

2010 ◽  
Vol 443 ◽  
pp. 330-335 ◽  
Author(s):  
Yu Han Wang ◽  
Jing Chun Feng ◽  
Sun Chao ◽  
Ming Chen
Keyword(s):  
Tool Path ◽  
Flank Milling ◽  
Interpolation Algorithm ◽  
Machining Time ◽  
Surface Machining ◽  
Tool Axis ◽  
Scanning Area ◽  
Nurbs Interpolation ◽  
Milling Method ◽  
Five Axis

In order to exploit the advantages of five-axis flank milling method for space free surface machining to the full, a definition of non-equidistant dual-NURBS tool path is presented first. On this basis, the constraint of velocity of points on the tool axis and the constraint of scanning area of the tool axis are deduced. Considering both of these constraints, an adaptive feed five-axis dual-NURBS interpolation algorithm is proposed. The simulation results show that the feedrate with the proposed algorithm satisfies both of the constraints and the machining time is reduced by 38.3% in comparison with the constant feed interpolator algorithm.

Modeling and Control of Contouring Errors for Five-Axis Machine Tools—Part I: Modeling

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Burak Sencer ◽  
Yusuf Altintas ◽  
Elizabeth Croft
Keyword(s):  
Robust Control ◽  
Machine Tools ◽  
Error Model ◽  
Rigid Body Dynamics ◽  
Sculptured Surfaces ◽  
Axis Orientation ◽  
Modeling And Control ◽  
Joint Coordination ◽  
Tool Axis ◽  
Five Axis

Aerospace, die, and mold industries utilize parts with sculptured surfaces, which are machined on five-axis computer numerical controlled machine tools. Accurate path tracking for contouring is not always possible along the desired space curves due to the loss of joint coordination during the five-axis motion. This two-part paper presents modeling and robust control of contouring errors for five-axis machines. In Part I, two types of contouring errors are defined by considering the normal deviation of tool tip from the reference path, and by the normal deviation of the tool axis orientation from the reference orientation trajectory defined in the spherical coordinates. Overall contouring errors are modeled during five-axis motion that has simultaneous translation and rotary motions. The coupled kinematic configuration and the rigid body dynamics of all five drives are considered. The contouring error model is experimentally validated on a five-axis machine tool. The error model developed in this paper is then used for simultaneous, real-time robust control of all five drives in Part II.

Analysis and Compensation Strategy of Non-Linear Error in Five-Axis CNC Machining

2014 ◽  
Vol 644-650 ◽  
pp. 4967-4970 ◽  
Author(s):  
Hong Jun Liu ◽  
Ai Guo Zhang ◽  
Ji Bin Zhao ◽  
Jin Shang ◽  
Jun Liu
Keyword(s):  
Complex Surface ◽  
Cnc Machining ◽  
Machining Accuracy ◽  
Machining Error ◽  
Tool Axis ◽  
Non Linear ◽  
New Strategy ◽  
Tool Position ◽  
Five Axis ◽  
Tool Axis Vector

This paper presents a new strategy of analysis and compensation of non-linear error. Non-linear error is an important source of machining error in multi-axis numerical controlled machining and it is unavoidable. In view of tool positions optimization in five-axis CNC machining of complex surface, this paper presents a strategy for non-linear error compensation in five-axis machining: Firstly, non-linear error caused by the change of tool axis vector is analyzed and the non-linear error model is established, in order to get the maximum non-linear error of interpolation segment; Then, the tool position that meets the machining accuracy is obtained; Finally, Simulation and analysis of the model show that the proposed method is effective and greatly improves the geometric accuracy.

Tool Path Planning for Five-Axis NC Machining of Implant Shaping Mold for Cranioplasty

2011 ◽  
Vol 697-698 ◽  
pp. 292-296
Author(s):  
Liang Zhang ◽  
J. Li ◽  
B.C. Lou
Keyword(s):  
Path Planning ◽  
Tool Path ◽  
Nc Machining ◽  
Normal Curvature ◽  
Tool Path Planning ◽  
Lead Angle ◽  
Tool Axis ◽  
Nc Machine ◽  
Five Axis ◽  
Tool Axis Vector

The necessity for skull patch surface for cranioplasty was introduced and it was divided according to maximum normal curvature in the discrete points after skull patch surface dispersed. Then the tool axis vector was determined by the lead angle of the tool, corresponding to generating the tool path in each area; At last, the implant shaping mold for cranioplasty was produced by five-axis NC machine.

A decoupled five-axis local smoothing interpolation method to achieve continuous acceleration of tool axis

2020 ◽  
Vol 111 (1-2) ◽  
pp. 449-470
Author(s):  
Yang Jiang ◽  
Jiang Han ◽  
Lian Xia ◽  
Lei Lu ◽  
Xiaoqing Tian ◽  
...  
Keyword(s):  
Interpolation Method ◽  
Local Smoothing ◽  
Tool Axis ◽  
Five Axis

Research of the Tool Orientation Optimization with Kinematical Constraints

2013 ◽  
Vol 712-715 ◽  
pp. 2143-2148
Author(s):  
Hong Jun Liu ◽  
Jing Yu Cao ◽  
Ji Bin Zhao
Keyword(s):  
Coordinate System ◽  
Correction Method ◽  
Cnc Machining ◽  
Contact Points ◽  
Axis Of Rotation ◽  
Tool Axis ◽  
Efficient Processing ◽  
Velocity Constraints ◽  
Five Axis ◽  
Tool Axis Vector

Drastic change of the tool axis vector for five-axis CNC machining due to avoid global interference, proposed gentle forward, over-backward correction method to optimize the tool axis vector. Established a machine tool axis of rotation angular velocity constraints, and feed coordinate system, through the feed coordinate system adjust the inclination angle and swing angle of the existing tool axis vector to make the tool axis vector change between each adjacent cutter contact points satisfy the machine axis of rotation kinematics constraints and to ensure the continuity of feed rate during processing. Algorithm simulation examples show that the proposed method is reasonably practicable, make the tool axis vector changes fairing to ensure the smooth and efficient processing.

Optimization of Axis Tilt Machining with Five-Axis Ball-End Cutter

2011 ◽  
Vol 305 ◽  
pp. 357-362
Author(s):  
Ke Hua Zhang ◽  
Li Min ◽  
Dong Hui Wen
Keyword(s):  
High Efficiency ◽  
Optimization Methods ◽  
Processing Method ◽  
Process Efficiency ◽  
Processing Quality ◽  
Tool Axis ◽  
Traditional Processing ◽  
Five Axis

A half of covering angle processing method is proposed for optimizing process efficiency and quality with ball-end tool axis tilt. Firstly, according to the features of ball-end tool structural, this paper introduced traditional no-tilt processing problems, such as tool fast wear and poor processing quality, and then verified the effect of tool tilt processing by analyzing and comparing cutting quality with the differences of the no-tilt processing and tilt processing. Finally, it introduced two optimization methods about tool tilt processing, and also made a comparison with its feature. The results show that traditional processing brings about more extrusion and scratches, while little and high efficiency with method of tool tilt processing. Conclusion: it not only brings higher processing quality and efficiency, but also can make the ball-end cutter be longevity of service.

Free-Form Surface Five-Axis Machining Tool Path and Tool Posture Simultaneous Multi-Objective Optimization Theory Research

2011 ◽  
Vol 467-469 ◽  
pp. 900-905
Author(s):  
Shu Kun Cao ◽  
Li Song ◽  
Kai Feng Song ◽  
Jie Lv ◽  
Xiu Sheng Chen
Keyword(s):  
Tool Path ◽  
Contact Point ◽  
Free Form ◽  
Multi Objective Optimization ◽  
Scallop Height ◽  
Multi Objective ◽  
Tool Axis ◽  
Tool Posture ◽  
Free Form Surface ◽  
Five Axis

In view of all sorts of questions existing in CNC machining, such as machining vibration, so proposed a new simultaneous multi-objective optimization algorithm on free-form surface five-axis machining tool path and tool posture based on constant scallop height. In the algorithm, we first complete the surface fitting on the base of feature points obtained. Secondly calculate principal curvatures of the surface, select tools, and at the same time generate tool axis vector in the current cutter-contact point tool axis. Once again get the maximum spacing and surface curvature in accordance with the tool effective cutting radius, discrete into cutter-contact point, and calculate the cutting depth to adjust the machine feed rate. And finally connect adjacent curve path using the diagonal to achieve a continuous cutting scallop height tool path. This algorithm can achieve the goals such as the same precision, improving processing efficiency, reducing the number of tool cutting in and out, reducing cutting vibration and tool wear and so on. That is the algorithm can achieve simultaneous multi-objective optimization of the free-form surface NC machining finally.

Prediction of Cutter-Workpiece Engagement for Five-Axis Ball-End Milling

2014 ◽  
Vol 800-801 ◽  
pp. 254-258 ◽  
Author(s):  
Gang Gang Ju ◽  
Qing Hua Song ◽  
Zhan Qiang Liu
Keyword(s):  
Cutting Forces ◽  
End Milling ◽  
Complex Surface ◽  
Boundary Representation ◽  
Surface Machining ◽  
Ball End Milling ◽  
Tool Axis ◽  
Discrete Methods ◽  
Representation Method ◽  
Five Axis

Five-axis ball-end milling technology is widely used in many industries such as aerospace, automotive and die-mold for complex surface machining. Despite recent advances in machining technology, productivity in five-axis ball-end milling is still limited due to the high cutting forces and stability. Moreover, cutting forces in machining is determined by extracting the cutter workpiece engagement (CWE) from the in-process workpiece. A discrete boundary representation method is developed. Cutter is firstly divided into disk elements along the tool axis. And in each disk element, boundary representation based exact Boolean method is introduced for extracting complex cutter-workpiece engagements at every cutter location due to its efficiency and speed over other discrete methods. Developed engagement model is proved to calculate complex engagement regions between tool and workpiece efficiently and accurately.

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