Development of Automatic System for Process Planning and NC Program Generation on Turning-Milling Machine Tool With Three Turrets

2017 ◽  
Author(s):  
Ryo Fukuda ◽  
Ririko Kiyooka ◽  
Hideki Aoyama
Keyword(s):  
Machine Tool ◽  
Process Planning ◽  
Numerical Control ◽  
Free Form ◽  
Milling Machine ◽  
Machining Features ◽  
Process Plan ◽  
Program Generation ◽  
Nc Program ◽  
Free Form Surface

The objective of this study is to develop an automatic process planning and a numerical-control (NC) program generation system for free-form machining, using a turning-milling machine tool with multi-turrets. In this research, machining feature recognition was carried out based on the delta-volume decomposition to achieve process planning. This system can recognize machining features that include one free-form surface and can create a tool path for the free-form surface. A process plan candidate is generated via the assignment of machining features to each turret and the determination of the processing order of the machining features in each turret. The system generates many process plan candidates, and evaluates them based on the evaluation point of the user. In this research, the plan with the shortest machining time is selected. Next, the system automatically generates an NC program for each turret. Ultimately, a machining experiment using a turning-milling machine tool with three turrets was conducted to verify the usefulness of the system.

scholarly journals Assessment of the safety of use of portable machine tools

2018 ◽  
Vol 189 (3) ◽  
pp. 192-205
Author(s):  
Monika Nowak ◽  
Agnieszka Terelak-Tymczyna
Keyword(s):  
Machine Tool ◽  
Working Conditions ◽  
Machine Tools ◽  
Numerical Control ◽  
Milling Machine ◽  
Safety Issues ◽  
Large Size ◽  
Score Method ◽  
Characteristic Features ◽  
Risk Reducing

The article presents safety issues related to on-site machining with the use of portable machine tools. Their advantage is the possibility of machining elements at places in which they are used. This especially refers to large-size constructions, welded elements and any items whose disassembly is technically difficult. The authors present tasks performed by the operators of portable machining equipment, working conditions, construction and characteristic features of portable machine tools on the example of a portable boring machine, milling machine and flange facing machine. The presented characteristics can influence the safety of work with these machines. The information given in the article were used to asses risk at the position of a portable machine tool operator. The assessment was conducted using the Risk Score method taking into account four stages of using portable machine tools, i.e. transport, assembly/disassembly, machining and maintenance. The result of the conducted risk analysis is the proposal of possible risk reducing actions. Due to the specificity of the operation of portable machine tools which significantly impedes the development of a machine tool which would be safe in and of itself, the proposed actions refer mainly to organisational solutions. The work presents also the thesis that it is possible to decrease the risk at this position thanks to the use of numerical control in a portable machine tool. Such a solution may reduce exposure to some identified threats. The issue is presented on the example of a prototype of a portable flange facing machine developed in the Institute of Mechanical Technology ZUT in Szczecin.

Comprehensive error modeling and compensation for optical free-form surface polishing machine tool

2015 ◽  
Vol 23 (6) ◽  
pp. 1587-1597 ◽  
Author(s):  
张恩忠 ZHANG En-zhong ◽  
赵继 ZHAO Ji ◽  
冀世军 JI Shi-jun ◽  
林洁琼 LIN Jie-qiong ◽  
李刚 LI Gang
Keyword(s):  
Machine Tool ◽  
Error Modeling ◽  
Free Form ◽  
Surface Polishing ◽  
Free Form Surface ◽  
Polishing Machine

Tool Path Generation Method for High-Quality Machining of Free-Form Surfaces

2020 ◽  
Author(s):  
Yuki Takanashi ◽  
Hideki Aoyama
Keyword(s):  
Tool Path ◽  
High Accuracy ◽  
Tool Path Generation ◽  
Free Form ◽  
Machining Accuracy ◽  
Path Generation ◽  
High Quality ◽  
Nc Program ◽  
Free Form Surface ◽  
Free Form Surfaces

Abstract Machining data (NC program) is generated by a CAM system, which generates the tool path from the target shape as a plane approximation surface instead of a free-form surface. Owing to this plane approximation, machining accuracy is reduced. In this paper, we propose a method to process the shape with high accuracy by defining the areas where accuracy is not required as a plane approximation surface and defining the part where accuracy is required as free-form surfaces.

Research on Magnetic Abrasive Finishing for the Free Form Surface of Mould by 5-DOF Parallel Virtual Axis Machine Tool

2004 ◽  
Vol 259-260 ◽  
pp. 631-635 ◽  
Author(s):  
Y.P. Sun ◽  
S.X. Yuan ◽  
B.F. Feng ◽  
Guang Qi Cai ◽  
Jia Shun Shi ◽  
...  
Keyword(s):  
Machine Tool ◽  
Free Form ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Finishing ◽  
Free Form Surface

Proposal of a machining test to evaluate dynamic synchronization error of rotary and linear axes with reversal of rotation direction

2021 ◽  
pp. 1-16
Author(s):  
Qingzhao Li ◽  
Soichi Ibaraki ◽  
Wei Wang
Keyword(s):  
Machine Tool ◽  
Coordinate System ◽  
Numerical Control ◽  
Synchronization Error ◽  
Free Form ◽  
Contour Error ◽  
Surface Geometry ◽  
Rotation Direction ◽  
Machining Test ◽  
Five Axis

Abstract The five-axis machining of a free-form surface often contains the reversal of a rotary axis' rotation direction with linear axis synchronized with it. This paper proposes a machining test to quantitatively evaluate the influence of the reversal of rotation direction on the surface geometry. In the five-axis machining, the trajectory of tool position and orientation is firstly given in the workpiece coordinate system by the CAM (Computer-aided Manufacturing) software, and the CNC (Computerized Numerical Control) system converts it to the machine coordinate system to calculate command trajectories. This paper clarifies that the tool path smoothing in the machine coordinate system can potentially cause a large contour error because of the dynamic synchronization error of rotary and linear axes. Although some academic works in the literature presented the smoothing in the workpiece coordinate system, many commercial CNC systems still employ the smoothing in the machine coordinate system, partly because machine tool users or makers do not clearly see how significant this influence can be on the machining accuracy. The proposed machining test enables a user to quantitatively evaluate it. The machining experiment shows that the geometric error of the finished test piece was as large as 0.16 mm under the conventional smoothing in a commercial CNC system, which can be significantly larger than the influence of other typical geometric errors of a five-axis machine tool. This paper shows, by numerical simulation, that the smoothing in the workpiece coordinate system can completely eliminate this contour error.

Transformation of Three-Axis Tool Path to Inclined Plane for Five-Axis Machining

2013 ◽  
Vol 716 ◽  
pp. 614-619
Author(s):  
Chen Hua She ◽  
Zhi Hao Zheng
Keyword(s):  
Machine Tool ◽  
Tool Path ◽  
Control Program ◽  
Simulation Software ◽  
Numerical Control ◽  
Inclined Plane ◽  
Nc Program ◽  
Cad Cam ◽  
Five Axis ◽  
Very High

Manufacturing industries such as the aerospace industry and the molding industry need to process products of complex and high-precision curved surface. Multi-axis machine tool with two rotational axes plays an indispensable role in processing such products. However, in a fiercely competitive market, each manufacturer is devoted to reduce processing time and costs. Therefore, how to efficiently create multi-axis numerical control program has become an important issue. Typical multi-axis machining parts often have specific machining features such as hole, groove or even engraved text on the inclined plane. Although the tool path can be generated by the advanced multi-axis CAD/CAM system, the prices of such systems are very high. This study proposed a methodology for defining the inclined working plane of the multi-axis machining tool. According to the defined working coordinate system proposed in this study, the tool path files of the traditional three-axis machine tool can be transformed to the five-axis NC program through post-processing calculation. As a result, the required NC program can be obtained for the same machining feature on any inclined plane in shorter time. Finally, this study tested and confirmed the accuracy of the numerical control program by solid cutting simulation software.

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