Machining Accuracy Enhancement by Modifying NC Program

2006 ◽  
pp. 71-75 ◽  
Author(s):  
H.J. Jing ◽  
Y.X. Yao ◽  
S.D. Chen ◽  
X.P. Wang
Keyword(s):  
Machining Accuracy ◽  
Accuracy Enhancement ◽  
Nc Program

Machining Accuracy Enhancement by Modifying NC Program

2006 ◽  
Vol 315-316 ◽  
pp. 71-75 ◽  
Author(s):  
H.J. Jing ◽  
Ying Xue Yao ◽  
S.D. Chen ◽  
X.P. Wang
Keyword(s):  
Machining Accuracy ◽  
Accuracy Enhancement ◽  
Nc Program

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.

Key Technologies Research for Impellers Machining Based on NX

2011 ◽  
Vol 101-102 ◽  
pp. 1031-1034
Author(s):  
Xian Yi Li ◽  
Jian Zhong Fu ◽  
Ji Qiang Li
Keyword(s):  
Tool Path ◽  
Cutting Tool ◽  
Milling Process ◽  
Tool Path Generation ◽  
Machining Accuracy ◽  
Post Processing ◽  
Nc Code ◽  
Nc Program ◽  
Key Technologies ◽  
Nc Machine

Tool path generation, post-processing and verification and simulation of NC program are key technologies which are investigated in this research for manufacturing impellers. Generation of tool path aims at producing the cutting tool path. Post-processing transforms the cutter location file (CLSF file) of the tool path to the NC code which NC machine can recognize. Verification and simulation of NC program aims at proving the accuracy of program, thus the interference and collision can be avoided. When tool path is planned, increasing the machining efficiency during the rough and semi-finish milling process is the main consideration. Increasing machining accuracy is an important consideration for final finish milling.

An Accuracy-Prediction Model Taking Tool Deformation and Geometric Machine-Tool Error into Consideration

2010 ◽  
Vol 4 (3) ◽  
pp. 235-242 ◽  
Author(s):  
Hirohisa Narita ◽  
◽  
Keiichi Shirase ◽  
Eiji Arai ◽  
Hideo Fujimoto ◽  
...  
Keyword(s):  
Prediction Model ◽  
Machine Tool ◽  
End Milling ◽  
Geometric Error ◽  
Cutting Conditions ◽  
Error Prediction ◽  
Machining Accuracy ◽  
Trial And Error ◽  
Virtual Machining ◽  
Nc Program

Test cutting used to verify cutting conditions and machining accuracy after a numeric control (NC) program is written for end milling the mold and die indispensable to manufacturing is generally effective, because it is based on trial and error. The virtual machining simulator we designed to verify machining accuracy uses an accuracy-prediction model and an error prediction expression for workpieces, integrating machine-tool deformation and geometric error models. We also propose calculation for copying errors to a workpiece.

A Novel CAM System with X/Y/Z 3-Axis Machines for Large Scale Aspheric Lens Grinding

2010 ◽  
Vol 37-38 ◽  
pp. 23-31
Author(s):  
Xiang Yang Lei ◽  
Hao Huang ◽  
Shi Han Zhang ◽  
Jian Wang ◽  
Qiao Xu ◽  
...  
Keyword(s):  
Error Compensation ◽  
Large Scale ◽  
Grinding Wheel ◽  
Machining Accuracy ◽  
Form Error ◽  
Aspheric Lens ◽  
Geometry Model ◽  
Whole Process ◽  
Nc Program ◽  
The Stability

According to needs of aspheric lens grinding and measurement with X/Y/Z 3-axis grinding machines, a CAM system is designed and implemented. The system, based on the parallel grinding geometry model, has realized the function of grinding locus planning, form error compensation, NC program auto-generation, on-machine measurement, grinding wheel on-machine measurement, simulation and technical database. To verify the stability of this CAM system, experiments were performed with three independent machining experiments. The experimental results indicate that the system realized the whole process of aspheric grinding, and it improved the machining efficiency and automation. Especially, this system adopted on-machine form error compensation technology and improved the machining accuracy. By implementing the error compensation integrated in the CAM system, the surface form error of a 430mm×430mm aspheric lens is decreased from PV8.2µm to PV4.1µm. The grinding accuracy was improved 100%.

scholarly journals Generation Method of Cutting Tool Paths for High-Speed and High-Quality Machining of Free-Form Surfaces

2021 ◽  
Vol 15 (4) ◽  
pp. 521-528
Author(s):  
Yuki Takanashi ◽  
Hideki Aoyama ◽  
Song Cheol Won ◽  
◽  
Keyword(s):  
High Speed ◽  
Processing Time ◽  
Free Form ◽  
Machining Accuracy ◽  
Cnc Machine ◽  
Block Processing ◽  
Tool Paths ◽  
Nc Program ◽  
Straight Line ◽  
Free Form Surfaces

In general, NC programs for machining free-form surfaces using a computer numerical control (CNC) machine tool are generated using a computer-aided manufacturing (CAM) system. The tool paths (CL data) generated by a CAM system are approximated straight-line segments based on tolerance (allowable error). As a result, the tolerance affects the machining accuracy and time. If the tolerance is set to a small value, the lengths of the segments are shortened, and the machining accuracy is improved. The process in which a CNC machine tool reads and analyzes an NC program and controls the motors requires a minimum processing time of an NC program block (block-processing time). Therefore, if the lengths of the approximated straight-line segments are too small, it will be impossible to reach the indicated feed speed, and the machining time will be longer. In this study, by identifying the block-processing time of a CNC controller and deriving the appropriate length of the approximated straight-line segment based on the block-processing time, a CL data creation method that is capable of high-speed and high-accuracy free-form surface machining is proposed. In addition, experimental verification tests of the method are conducted.

Compensation Method for Tool Setting Errors Based on Non-Contact On-Machine Measurement

2020 ◽  
Vol 14 (1) ◽  
pp. 66-72
Author(s):  
Meng Xu ◽  
Keiichi Nakamoto ◽  
Yoshimi Takeuchi ◽  
◽  
Keyword(s):  
Machine Tool ◽  
Direct Detection ◽  
Compensation Method ◽  
Machining Accuracy ◽  
Laser Imaging ◽  
Imaging Device ◽  
Tool Positioning ◽  
Nc Program ◽  
Tool Setting ◽  
Tool Position

The high-accuracy manufacturing of optical requires highly integrated ultraprecision cutting technologies. However, all sorts of small errors adversely affect machining accuracy because of the miniaturization and complexity of objects. Among these errors, slight setting errors critically impact machining accuracy because it is difficult to place a cutting tool accurately on a ultraprecision machine tool. The authors have conducted multi-axis control ultraprecision cutting based on tool setting errors compensation. In this compensation method, the workpiece must be removed from the machine tool after test cutting to measure grooves to detect actual tool positions and to calculate setting errors. However, after the workpiece is removed, it cannot be perfectly replaced on a ultraprecision machine tool. This makes it difficult to automate setting errors compensation. In order to solve these problems, tool positioning must be detected without removing the workpiece. Therefore, in this study, a novel compensation method is developed by means of non-contact measurement with a laser imaging device. Furthermore, in order to improve compensation performance, a laser imaging device is calibrated on an ultraprecision machine tool. The proposed method enables direct detection of actual tool position and calculation of the tool centerpoint coordinate on the machine coordinate system. By modifying an NC program, the tool setting errors can be finally compensated. The feasibility of the proposed compensation method is verified by conducting experiments of creating grooves.

Influence of NC Program Quality and Geometric Errors Onto S-Shape Machining Accuracy

2018 ◽  
Author(s):  
Ryuta Sato ◽  
Keiichi Shirase ◽  
Yukitoshi Ihara
Keyword(s):  
Great Influence ◽  
Geometric Error ◽  
Machining Accuracy ◽  
Geometric Errors ◽  
Machined Surface ◽  
Nc Program ◽  
Finished Surface ◽  
Machining Test ◽  
Five Axis

S-shaped machining test is proposed for ISO standard to evaluate the motion accuracy of five-axis machining centers. However, it have not been investigated that which factor mainly influences the quality of the finished S-shape workpieces. This study focuses on the influence of the quality of NC program and geometric errors of rotary axes onto the quality of finished surface. Actual cutting tests and simulations are carried out to the investigation. As the results, it is clarified that the tolerance of NC program has a great influence onto the quality. It is also clarified that the geometric errors have great influences onto the quality. However, it is difficult to evaluate the influence of each geometric error because all geometric errors make glitches at the same point on the machined surface. It can be concluded that the proposed S-shape machining test can be used as the total demonstration of the machining techniques.

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