RTCP Function in Five-Axis Machining

2011 ◽  
Vol 464 ◽  
pp. 254-259 ◽  
Author(s):  
Shu Tian Fan ◽  
Wei Ping Yang ◽  
Chao Jie Dong
Keyword(s):  
Detailed Analysis ◽  
Real Time ◽  
Point Function ◽  
Cnc System ◽  
Rotary Axes ◽  
Center Point ◽  
Non Linear ◽  
Rtcp Function ◽  
Five Axis ◽  
Time Linear

Because of the rotate kinematics, the machining of 5-axis brings up the non-linear error. The RTCP (Rotation Tool Center Point) function can always make the interpolated point on the programming track by a real-time linear compensation of CNC system for motion of the rotary axes. Based on detailed analysis of the kinematics principle of 5-axis machine with dual rotary tables, a new design of interpolated algorithm integrated with RTCP function is presented which is simulated in MATLAB, and the result indicates that the algorithm can reduce the non-linear error effectively.

A Universal Postprocessor of General Table-Tilting Type of Five-Axis Machine Tools Without Rotational Tool Center Point Function for Actual NC Code Generation

2018 ◽  
Author(s):  
Guoqiang Fu ◽  
Hongli Gao ◽  
Tengda Gu
Keyword(s):  
Code Generation ◽  
Machine Tools ◽  
Kinematic Chain ◽  
Rotary Axes ◽  
Nc Code ◽  
Rotation Axes ◽  
Cutting Test ◽  
Center Point ◽  
Rtcp Function ◽  
Five Axis

The postprocessor is essential for machining with five-axis machine tools. This paper develops one universal postprocessor for table-tilting type of five-axis machine tools without rotational tool center point (RTCP) function. Firstly, positions of two rotary axes and the workpiece in the machine coordinate system (MCS) are introduced into the kinematic chain of the five-axis machine tools. The uniform product of exponential (POE) formula of the tool relative to the workpiece is established to obtain the universal forward kinematics. On this basis, the postprocessor of table-tilting type of five-axis machine tools is developed. The calculation of rotation angles of rotation axes is proposed in details, including the calculation of double solutions, the determination of rotation angles of C-axis and the selection principle of the shortest path of rotation angles. Movements of linear axes are calculated with rotation angles of rotary axes. The generated movements of all axes are actual positions of all axes relative to their zero positions, which can be used for machining directly. The postprocessor does not rely on RTCP function with positions of rotary axes and the workpiece in MCS. Finally, cutting test in VERICUT and real cutting experiments on SmartCNC500_DRTD five-axis machine tool are carried out to verify the effectiveness of the proposed postprocessor.

Research of RTCP Function for Five-Axis Machine Tools Based on Low-Cost Embedded CNC System

2016 ◽  
Vol 693 ◽  
pp. 1591-1597
Author(s):  
Xiang Xiang Zou ◽  
Yan Yu Ding ◽  
Tai Yong Wang ◽  
Zhen Sang ◽  
He Nan Xu
Keyword(s):  
Machine Tools ◽  
Low Cost ◽  
High Grade ◽  
Arc Length ◽  
Cnc System ◽  
Offset Distance ◽  
Rtcp Function ◽  
Computational Resources ◽  
Five Axis ◽  
Embedded Cnc

To solve the problem which current research of RTCP function is limited to high-grade CNC system. Based on limited computational resources of the embedded CNC system, analyzes and modeling calculates RTCP function of CA double swing structure, and points out the offset distance is only related to the chord length corresponding to the arc length that the rotating radius crosses, and obtains the calculation formula of compensation. Finally, gives the implementing flow chart of the RTCP algorithm for low-cost embedded CNC system.

Study on Real-Time Compensation RTCP Module of Five-Axis CNC System

2011 ◽  
Vol 317-319 ◽  
pp. 1662-1667 ◽  
Author(s):  
Ze Hua Hu ◽  
Wei Qiang Gao ◽  
Chao Ting Qing ◽  
Cheng Sheng Fang
Keyword(s):  
Real Time ◽  
Calculation Method ◽  
Implementation Process ◽  
Cnc System ◽  
Module Theory ◽  
Hardware Platform ◽  
Nc Code ◽  
Compensation Error ◽  
Algorithm Implementation ◽  
Five Axis

Taking A-C axis dual rotary working table of 5-axis CNC system as an example, the function of RTCP is introduced and the performing difference between standard NC code and RTCP code is analyzed in this paper. Then, the calculation method of RTCP compensation error has been illustrated. Taking the high precision as the objective, a new real time compensation RTCP module theory is presented and its algorithm implementation process is introduced. Then, this algorithm has been simulated using MATLAB and validated in hardware platform.

Five-axis NURBS Path Real-time Generation Method in CNC System

2010 ◽  
Vol 2 (3) ◽  
pp. 64-69
Author(s):  
Chen Liangji ◽  
Gao Changyin ◽  
Feng Xianzhang
Keyword(s):  
Real Time ◽  
Cnc System ◽  
Five Axis

A New Method for Identifying Geometric Errors Inherent to Revolving Axle of Multi-Axis Machine Tool

2011 ◽  
Vol 697-698 ◽  
pp. 262-267
Author(s):  
Guo Fu Ding ◽  
Lei Jiang ◽  
Shao Wei Zhu ◽  
Shu Wen Ma
Keyword(s):  
Machine Tool ◽  
Great Difficulty ◽  
New Method ◽  
Identification Algorithm ◽  
Structural Constraints ◽  
Geometric Errors ◽  
Point Function ◽  
Center Point ◽  
Ball Bar ◽  
Five Axis

Geometric errors identification of revolving axle of multi-axis machine tool has encountered a great difficulty in geometric errors compensation. This paper describes a new method to identify geometric errors inherent to revolving axle of multi-axis machine tool based on a ball-bar system. Under RTCP (Rotation Around Tool Center Point) or RPCP (Rotation Around Part Center Point) function, the displacement errors of revolving axle in X, Y and Z direction can be obtained by the ball-bar system respectively at every measurement angle. With the corresponding identification algorithm proposed in this paper, the whole six geometric errors of revolving axle can be identified. This new method is suitable for any type of multi-axis machine tool and without structural constraints. To confirm the validity of the proposed method, an experiment has been conducted on a five-axis machine tool, and the results show that this method is effective and applicable.

Design of Five-aixs CNC System for Electric Discharge Grinding (EDG) Polycrystalline Diamond (PCD) Tools

2012 ◽  
Vol 538-541 ◽  
pp. 1316-1321
Author(s):  
Shao Hua Shi ◽  
Pei Qing Ye ◽  
Chen Xi Fang
Keyword(s):  
Real Time ◽  
Polycrystalline Diamond ◽  
Curved Surface ◽  
Electrode Wear ◽  
Software System ◽  
Cnc System ◽  
Mechanical Structure ◽  
Hardware Circuit ◽  
Five Axis ◽  
Pcd Tools

Polycrystalline Diamond (PCD) tools are widely used while machining wood-based composites because of its outstanding hardness, thermal conductivity and abrasive resistance. However, the above mentioned beneficial properties such as super hardness also cause problems in manufacturing PCD tools using traditional process methods. The main problem now in manufacturing PCD tools is the low efficiency and difficulties while manufacturing PCD tools with complex curved surface. To manufacture PCD tools with complex curved surface more efficiently, in this paper, the mechanical structure, hardware circuit and software system of five-axis EDG CNC system are introduced. To satisfy the unique requirements of EDG, a proper mechanical structure of 5 CNC controlled axis and 2 manual axis are given, as well as the design of hardware circuit of EDG based on PCI Bus. The software system which is designed based on RT-Linux is divided into four modules: real-time cyclical tasks module, real-time gusty tasks module, non real-time tasks module and EDG process database. , This paper gives out the solutions of the specific functions of this special CNC system, including automatic measurement, automatic programming, automatic electrode wear compensation, and detection and control of spark gap. The detailed structure and organization of the software system is also provided. At last, through actual cutting experiments of woodworking PCD tools, the correctness and practicality of this system is verified.

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