Global tool interference detection in five-axis machining of sculptured surfaces

2002 ◽  
Vol 216 (10) ◽  
pp. 1345-1353 ◽  
Author(s):  
Y-L Cai ◽  
G Xi
Keyword(s):  
Iterative Algorithm ◽  
Minimum Distance ◽  
High Efficiency ◽  
New Method ◽  
Interference Detection ◽  
Sculptured Surfaces ◽  
Tool Interference ◽  
Five Axis ◽  
Corrective Method

This paper presents a new method for the detection and elimination of global interference in five-axis machining of sculptured surfaces. Projecting points on the surface to the axis of cutter, the minimum distance from surface to cutter axis can be directly calculated by an iterative algorithm; the amount of interference is subsequently determined. A corrective method for generating an interferential-free cutter location is then proposed. The implementation has proved that the proposed method has a high efficiency and precision.

The Free-Form Surface Five-Axis Machining Global Interference Detection and Adjustment of Cutter Shaft

2011 ◽  
Vol 393-395 ◽  
pp. 1550-1553
Author(s):  
Peng Cheng Wu ◽  
Fang Chen Xia ◽  
Hai Ning Tu
Keyword(s):  
Surface Structure ◽  
High Precision ◽  
High Efficiency ◽  
Free Form ◽  
Interference Detection ◽  
Tool Interference ◽  
Free Form Surface ◽  
Five Axis ◽  
Global Surface ◽  
Interference Problems

Proposed a construction method of visual cone, to solve the surface 5-axis NC machining tool interference problems with the surface. At any point on the surface structure the visual cone area, according to visual cone determine whether the global tool interference with surface, and correct the tool spindle of interference cutter, solved the global surface and tool interference problems successfully. The application shows, this method is of high efficiency, high precision.

Process simulation for five-axis grinding machining using an analytical method

2017 ◽  
Vol 232 (17) ◽  
pp. 2965-2975 ◽  
Author(s):  
Qiang Guo ◽  
Bo Zhao ◽  
Yan Jiang
Keyword(s):  
Analytical Method ◽  
Tool Path ◽  
High Efficiency ◽  
Arbitrary Point ◽  
Machining Process ◽  
Sculptured Surfaces ◽  
Envelope Surface ◽  
Geometrical Modelling ◽  
Sweep Surface ◽  
Five Axis

In order to promote manufacturing quality for sculptured surfaces, ultra-precision grinding has been used more and more widely in the fields such as aerospace and mould, etc. However, as a key aspect technology, the five-axis grinding simulation has not been paid enough attentions based on the published achievements. This paper presents an analytical method which could compute the wheel-swept surfaces based on the geometrical modelling of the machining process. Considering the tool path in the five-axis machining process, the normal and the velocity vectors for an arbitrary point on the wheel surface are computed firstly. Using the envelope theory, the point on the wheel’s surface as well as on the envelope surface can be calculated. For an arbitrary wheel’s position, the generating line of the envelope surface is obtained using fitting theory when all the sample points are known. Therefore, the sweep-surface can be gained when all the generating curves along the tool path are fitted. Finally, two examples and an example are conducted to verify the theory and the results show that the method can calculate the envelope surface with high efficiency.

Rapid Toolpath Correction for Five-Axis High Efficiency Machining Based on Image Analysis

2012 ◽  
Vol 723 ◽  
pp. 130-135
Author(s):  
Li Qiang Zhang ◽  
Da Zhong Wang
Keyword(s):  
Image Analysis ◽  
Collision Detection ◽  
High Speed ◽  
Tool Path ◽  
High Efficiency ◽  
Geometric Model ◽  
Machining Errors ◽  
Tool Interference ◽  
Tool Motion ◽  
Five Axis

Five-axis high speed machining can improve the efficiency and accuracy obviously, but the machining errors and tool interference are likely to happen due to the complexity of tool motion. So the collision detection and verification of tool path are very important and necessary before machining the part. Using a combination of process simulation and collision detection based on image analysis, a rapid detection approach is developed in this research. The geometric model provides the cut geometry for the collision detection and records a dynamic geometric information for in-process workpiece. For the precise collision detection, a strategy of image analysis method is developed in order to make the approach efficient and maintian a high detection precision. An example of five-axis machining propeller is studied to demonstrate the proposed approach.

A New Method for Aggregate Proportion Design of Mixture

2012 ◽  
Vol 178-181 ◽  
pp. 1250-1253
Author(s):  
Yu Hua Li ◽  
Kai Huang ◽  
Ying Zhen Gao
Keyword(s):  
Iterative Algorithm ◽  
Accurate Result ◽  
High Accuracy ◽  
New Method ◽  
Equation Method ◽  
Normal Equation ◽  
Improved Method ◽  
Mixture Ratio ◽  
Target Value ◽  
Initial Target

When we make design of mixture ratio, we always use normal equation method (NEM), but the solution value of that method may doesn’t meet our demand. When we use the new method that proposed in this paper, we can solve the problem. The new method makes an improvement for NEM. By iterative algorithm, the new method uses the gradation data calculated by NEM as initial target value, canceling the relevant aggregate if the result of proportion is negative, and setting the gradation to the boundary value if the target value goes beyond limits. According to the adjusted object value, using NEM again, the new aggregate proportion can be solved. Then the new gradation of mixture will come into being the next target value. Finally, the accurate result will meet our need. The new improved method has good engineering applicability and high accuracy

Study on Grinding Technology of Electrical Discharge Grinding of Curve Edge Polycrystalline Diamond

2006 ◽  
Vol 304-305 ◽  
pp. 206-209 ◽  
Author(s):  
Gang Liu ◽  
Ming Chen ◽  
Z.G. Hu ◽  
X.F. Zhu ◽  
H. Xu ◽  
...  
Keyword(s):  
Surface Quality ◽  
Electrical Discharge ◽  
High Efficiency ◽  
Practical Significance ◽  
Cnc System ◽  
Milling Cutter ◽  
Curve Edge ◽  
Grinding Machine ◽  
Five Axis ◽  
Pcd Tools

PCD tools, especially curve edge PCD compound tools are used widely in machining nonferrous and non-metal materials with high efficiency and precision because of their excellent cutting properties. But high quality grinding of PCD tools is the uppermost obstacle in application because there are great difficulties to profile and sharpen edge in grinding, especially for milling cutter and drill with curve edge. This paper studied technology of wire EDG curve edge PCD compound tools by wire electrical discharge grinding machine with five-axis CNC system. The grinding quality was evaluated by scanning electron microscope (SEM) and roughometer. Three steps processing technique (roughing, finishing and fine finishing) and optimal process parameters of wire EDG PCD tools were recommended after considering synthetically the surface quality, precision and machining efficiency. The results met the requirement of high surface quality, precision and efficiency. This paper also applied successfully the optimal technology to grind a PCD milling cutter with outer and inner blade by electrical discharge grinding machine with five-axis CNC system. By the optimal parameters, the process yielded high precision of ±4.3µm and low roughness of 0.30µm. Experiment results have great practical significance to the high precise and efficient wire EDG of PCD tools.

Automatic Planning for 5-Axis Sculptured Surface Machining

1994 ◽  
Author(s):  
Yuan-Shin Lee ◽  
Tien-Chien Chang
Keyword(s):  
Sculptured Surface ◽  
Sculptured Surfaces ◽  
Design Modification ◽  
Surface Machining ◽  
Sculptured Surface Machining ◽  
Cutter Path ◽  
Automatic Planning ◽  
Five Axis ◽  
Five Axes ◽  
Complete Operation

Abstract In modern product design, sculptured surfaces are commonly used for functional and artistic shape design. Design of sculptured surfaces is evolutionary, consisting primarily of incremental changes to existing part surfaces. Manual operation planning for sculptured surface machining is known to be error-prone and inefficient, which requires considerable checking, verification, and rework. Five-axis machining has higher productivity and better machining quality than 3-axis machining. However, the programming for 5-axis machining is more difficult due to the complex simultaneous cutter movements along the machine’s five axes. This paper presents a systematic methodology to generate operation plans for 5-axis sculptured surface machining. A complete operation plan and the error-free cutter path can be automatically generated from the CAD part design. To achieve design for manufacturing of sculptured surface products, the machining unfeasibility information can be fed back to the designer for further design modification. Results of computer implementation and testing examples are also presented.

Design of high-efficiency Hybrid Power Amplifier with concurrent F&F−1 class operations for 5G application

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Meisam Tahmasbi ◽  
Farhad Razaghian ◽  
Sobhan Roshani
Keyword(s):  
Power Amplifier ◽  
High Efficiency ◽  
New Method ◽  
Power Added Efficiency ◽  
Hybrid Power ◽  
Novel Structure ◽  
Mode A

Abstract This paper presents a novel structure of Hybrid Power Amplifier (HPA) to operate in two arbitrary classes of operation at two desirable frequencies. The proposed HPA is designed in concurrent F&F−1 classes, simultaneously for 5G application. Presented HPA can solve the harmonics interference problem for concurrent F and F−1 classes and also for any arbitrary class of operation in desired frequencies. The designed HPA operates at 1.5 GHz frequency in the F class mode, while operates at 2.1 GHz frequency in the F−1 class mode. A new method is presented by using two diplexers to provide two paths for signal in different frequencies. Two parallel paths are used at the output of the HPA circuit, so the proposed HPA can operate at two classes. Two diplexers are used in the HPA to make proper isolation between the designed paths. In design of the proposed HPA, according to the utilized diplexers, the amplifier can operate between two arbitrary classes of operation at desired frequencies without any specific switch. The measured drain efficiency (DE) and power added efficiency (PAE) parameters are 57 and 51%, respectively at 2.1 GHz, while measured DE and PAE are 64 and 54%, respectively at 1.5 GHz.

Five-axis CNC milling for effective machining of sculptured surfaces

1993 ◽  
Vol 31 (11) ◽  
pp. 2559-2573 ◽  
Author(s):  
H. D. CHO ◽  
Y. T. JUN ◽  
M. Y. YANG
Keyword(s):  
Cnc Milling ◽  
Sculptured Surfaces ◽  
Five Axis

Multivariate Constrained GNSS Real-time Full Attitude Determination Based on Attitude Domain Search

2018 ◽  
Vol 72 (2) ◽  
pp. 483-502
Author(s):  
Hongtao Wu ◽  
Xiubin Zhao ◽  
Chunlei Pang ◽  
Liang Zhang ◽  
Bo Feng
Keyword(s):  
Objective Function ◽  
Success Rate ◽  
High Efficiency ◽  
Attitude Determination ◽  
A Priori ◽  
Three Dimensional ◽  
Satellite System ◽  
New Method ◽  
Lambda Method ◽  
Attitude Angle

A priori attitude information can improve the success rate and reliability of Global Navigation Satellite System (GNSS) multi-antennae attitude determination. However, a priori attitude information is nonlinear, and integrating a priori information into the objective function rigorously will increase the complexity of an ambiguity domain search, such as the Multivariate Constrained-Least-squares Ambiguity Decorrelation Adjustment (MC-LAMBDA) method. In this paper, a new method based on attitude domain search is presented to make use of the a priori attitude angle information with high efficiency. First, the a priori information of pitch and roll is integrated into the search process to derive the analytic search step for attitude angle, and the integer candidates are determined by traversal search in the three-dimensional attitude domain. Then, the objective function is parameterised with Euler angles, and a non-iterative approximate method is utilised to simplify the iterative computation in calculating objective function values. Experimental results reveal that compared to the MC-LAMBDA method, our new method has the same success rate and reliability, but higher efficiency in making use of a priori attitude information.

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