Shape Accuracy Improvement Obtained by μ-SPIF by Tool Path Compensation

Technological assurance of the accuracy of cycloidal helical surfaces when processing them with a non-profiled tool on CNC machines

Chernye Metally ◽

10.17580/chm.2020.11.08 ◽

2020 ◽

pp. 56-61

Author(s):

A. A. Goncharov ◽

Keyword(s):

Tool Path ◽

Mining Industry ◽

Control Program ◽

Automated System ◽

Shape Accuracy ◽

Cnc Machines ◽

Additional Equipment ◽

Screw Surface ◽

Working Bodies ◽

Machining Strategies

Modern designs of volumetric machines have parts containing complex-profile cycloidal screw surfaces as working bodies. The shaping of some types of this surfaces, such as the rotor surface of a conical singlescrew compressor, is possible only through the use of non-profiled tools and using specialized machining strategies. In view of the high prospects of using such structures in astronautics, robotics, medicine in the mining industry and metallurgy, there is an urgent problem of cycloidal helical surfaces accuracy during their processing on CNC machines. This work is devoted to the study of this problem. In the course of the study, a technological approach was chosen that provides control of the shape accuracy parameters when processing these surfaces, which consists in programmed feed control during processing. An analytical formalized algorithm for calculating the amount of feed change was integrated into an automated system for calculating the tool path, which made it possible to carry out experimental processing of a series of samples. The results of a metrological study of the accuracy of the shape of samples processed using a software-implemented technique for increasing the accuracy of the cross-section of cycloidal helical surfaces are presented. The efficiency of application of the proposed technique in the processing of miniature cycloidal helical surfaces is shown. Therefore, for the singlescrew micro-dispenser selected as a characteristic part of the rotor, it was possible to reduce the deviation from the circularity of the crosssectional profile of the cycloidal screw surface by more than three times. This demonstrates the possibility of increasing the accuracy of processing a complex-shaped surface by modifying the code of the control program without using additional equipment or more advance tools.

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Study on Ball End Milling of Inclined Surfaces for Ultra High Molecular Weight Polyethylene

International Journal of Automation Technology ◽

10.20965/ijat.2017.p0948 ◽

2017 ◽

Vol 11 (6) ◽

pp. 948-957 ◽

Cited By ~ 1

Author(s):

Kousuke Shintoku ◽

Hirohisa Narita ◽

◽

Keyword(s):

Molecular Weight ◽

High Molecular Weight ◽

Tool Path ◽

End Milling ◽

Cutting Conditions ◽

Shape Accuracy ◽

Inclined Surfaces ◽

Scanning Line ◽

Weight Structure ◽

Ultra High Molecular Weight

Ultra-high molecular weight polyethylene (UHMWPE) is a polyethylene with a molecular weight ranging from one million to seven million. UHMWPE is often used for constructing sliding parts such as artificial knees, hip joints, and gears owing to its self-lubrication, wear resistance, biocompatibility, and light weight structure. High accuracy and smooth surfaces are required for UHMWPE parts. Cutting operations of UHMWPE are particularly suitable for small numbers of products and to realize high shape accuracy. This paper describes some surface properties due to ball end mill operations of inclined surfaces. Some inclined workpieces are fixed by jigs and various cutting conditions are analyzed. Two tool path patterns, namely contour line and raster line (scanning line), are also evaluated for various cutting conditions by surface observations and surface roughness measurement.

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Accuracy Improvement of Tool Path of Five-Axis Machining Centers Based on Measurement and Compensation of Geometric Deviations

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C ◽

10.1299/kikaic.78.3557 ◽

2012 ◽

Vol 78 (794) ◽

pp. 3557-3568

Author(s):

Shintaro TONE ◽

Noriyuki KATO ◽

Masaomi TSUTSUMI

Keyword(s):

Tool Path ◽

Accuracy Improvement ◽

Geometric Deviations ◽

Five Axis

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A Study on the Deformation Behavior of a Microstructure Depending on Its Shape and the Cutting Section in the Precision Cutting of a Functional Part

Applied Sciences ◽

10.3390/app9142940 ◽

2019 ◽

Vol 9 (14) ◽

pp. 2940

Author(s):

Ki-Hyeong Song ◽

Young-Jae Choi ◽

Yong-Shin Lee

Keyword(s):

Deformation Behavior ◽

Tool Path ◽

Precision Machining ◽

Shape Error ◽

Shape Accuracy ◽

Cross Sectional ◽

Two Factors ◽

Functional Part ◽

And Performance ◽

Sectional Shape

The shape accuracy of microstructures is an important factor that directly affects the quality and performance of products. Nevertheless, it is difficult to find a study for the shape accuracy of microstructures below several microns. This study aimed to reduce the shape error in the precision machining of microstructures with a repeated triangular cross-sectional shape with a width of 5 µm or less. Two important factors in this study were the morphological features of the microstructure to be fabricated and the cross-sectional shape of the chip. The tool path was modified in consideration of these two factors. Before the tool path change, the shape error due to the deformation of the triangular micropattern in a DOC (depth of a cut) of 1 µm was about 0.39 µm. However, after the tool path was modified, the shape error due to deformation did not occur while maintaining the DOC at 1 µm.

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Improvement of Simultaneous 5-Axis Controlled Machining Accuracy by CL-Data Modification

International Journal of Automation Technology ◽

10.20965/ijat.2019.p0583 ◽

2019 ◽

Vol 13 (5) ◽

pp. 583-592

Author(s):

Ryuta Sato ◽

Kiichi Morishita ◽

Isamu Nishida ◽

Keiichi Shirase ◽

Masanobu Hasegawa ◽

...

Keyword(s):

Tool Path ◽

Compensation Method ◽

Control Mode ◽

Machining Accuracy ◽

Normal Vector ◽

Geometrical Shape ◽

Feed Speed ◽

Machined Surface ◽

Shape Accuracy ◽

Controlled Motion

As the motion accuracy of 5-axis machining centers directly influences the geometrical shape accuracy of the machined workpieces, accuracy enhancement of the 5-axis machining centers is strongly needed. To improve the shape accuracy during the machining by a 5-axis machine tool, a method that modifies the CL-data based on the motion trajectory errors normal to the machined surface at each command point has been proposed. In this study, the proposed method is applied to simultaneous 5-axis controlled machining to improve motion accuracy. A normal vector calculation method for the simultaneous 5-axis controlled motion is newly proposed, and the compensation method is applied to turbine blade machining by 5-axis controlled motion. Measurement tests of the cutting motion for blade shape machining by a ball-end mill were carried out with a different control mode of NC. The CL-data for the machining tool path was also modified based on the calculated trajectory of the tool center point. Experimental results reveal that the feed speed and machining accuracy significantly depend on the control mode of NC, and that the shape accuracy can be improved by applying the proposed compensation method without any decrease in motion speed.

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Shape Accuracy Improvement of Laser Lithography by Two Laser Beams. (First Report). Development of Laser Lithography System and Thai.

Journal of the Japan Society for Precision Engineering ◽

10.2493/jjspe.68.1450 ◽

2002 ◽

Vol 68 (11) ◽

pp. 1450-1454

Author(s):

Junji SONE ◽

Jouji TAZOE ◽

Shigekatsu WATANABE ◽

Yuichiro KUME ◽

Jun CHEN ◽

...

Keyword(s):

Laser Beams ◽

Accuracy Improvement ◽

Shape Accuracy ◽

First Report ◽

Laser Lithography ◽

Lithography System

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Five-Axis-Grinding With Toric Tools: A Status Review

Journal of Manufacturing Science and Engineering ◽

10.1115/1.4007460 ◽

2012 ◽

Vol 134 (5) ◽

Cited By ~ 15

Author(s):

Berend Denkena ◽

Anke Turger ◽

Leif Behrens ◽

Thomas Krawczyk

Keyword(s):

Computer Aided Design ◽

Tool Path ◽

Free Form ◽

Aviation Industry ◽

Tool Geometry ◽

Curved Surfaces ◽

Shape Accuracy ◽

Computer Aided ◽

Five Axis ◽

Free Form Surfaces

Free form surfaces are used in various applications, such as in the aviation industry, in the medicine, or for tool and die making. Compressor blades as well as knee prostheses and dies have complex curved surfaces. Five-axis grinding is a possibility to machine such curved surfaces in a high shape accuracy and surface quality. The use of this technology depends on a high degree of the operational background. Furthermore, the complexity of the tool path generation requires the use of computer-aided design/computer aided manufacturing (CAD/CAM) systems. This technical review gives an overview about state of the art of five-axis grinding and presents results, which can close some scientific lacks. Models were developed to predict the surface roughness and material removal dependent on the process parameters. Additionally, the relationship between tool geometry, shape accuracy as well as contact conditions is discussed.

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