Evaluation Method of Stationarity for NC Machining Process Based on Information Entropy

In the concept of the process signature, the relationship between a material load and the modification remaining in the workpiece is used to better understand and optimize manufacturing processes. The basic prerequisite for this is to be able to measure the loads occurring during the machining process in the form of mechanical deformations. Speckle photography is suitable for this in-process measurement task and is already used in a variety of ways for in-plane deformation measurements. The shortcoming of this fast and robust measurement technique based on image correlation techniques is that out-of-plane deformations in the direction of the measurement system cannot be detected and increases the measurement error of in-plane deformations. In this paper, we investigate a method that infers local out-of-plane motions of the workpiece surface from the decorrelation of speckle patterns and is thus able to reconstruct three-dimensional deformation fields. The implementation of the evaluation method enables a fast reconstruction of 3D deformation fields, so that the in-process capability remains given. First measurements in a deep rolling process show that dynamic deformations underneath the die can be captured and demonstrate the suitability of the speckle method for manufacturing process analysis.

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Fuzzy Matter-Element Evaluation Method for Analysis of Debris Flow Risk Assessment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.446-449.3058 ◽

2012 ◽

Vol 446-449 ◽

pp. 3058-3061 ◽

Cited By ~ 1

Author(s):

Chun Tan ◽

Jian Ping Chen ◽

Yu Zhen Pan ◽

Cen Cen Niu ◽

Li Ming Xu

Keyword(s):

Risk Assessment ◽

Debris Flow ◽

Information Entropy ◽

Evaluation Method ◽

Comprehensive Evaluation ◽

Practical Application ◽

Element Analysis ◽

Matter Element Analysis ◽

Concept Of Information

Based on the principle of fuzzy matter-element analysis, the concept of information entropy is introduced to establish a fuzzy matter-element evaluation method. This method is utilized to comprehensively evaluate the degree of debris flow. The classifications of debris flow are regarded as the objects of matter-element and their indexes for evaluation as well as the corresponding fuzzy values are used to construct the composite fuzzy matter-elements. By calculating the relevancy the comprehensive evaluation of debris flow can be carried out. This model is applied to analyze the degree of debris flow in the practical application. The application shows that the model is effective and practical.

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Discussion on NC Machining Process of Thin Walled Parts Technical Measures

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.701-702.864 ◽

2014 ◽

Vol 701-702 ◽

pp. 864-868

Author(s):

Da Lin Zhang ◽

Ke Gao ◽

Tian Rui Zhou

Keyword(s):

Industrial Production ◽

Nc Machining ◽

Machining Process ◽

Precision Machining ◽

Thin Wall ◽

Machining Precision ◽

Thin Walled ◽

Technical Measures

Thin wall parts are used more and more extensively in industrial production, analyze the influence of precision machining of thin-walled parts not higher factor, through the example of how to improve the machining precision of thin-wall parts, and gives the specific measures to solve practical problems.

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An approach for machining allowance optimization of complex parts with integrated structure

Journal of Computational Design and Engineering ◽

10.1016/j.jcde.2015.06.007 ◽

2015 ◽

Vol 2 (4) ◽

pp. 248-252 ◽

Cited By ~ 6

Author(s):

Ying Zhang ◽

Dinghua Zhang ◽

Baohai Wu

Keyword(s):

Nc Machining ◽

Machining Process ◽

Solution Strategy ◽

Adaptive Machining ◽

Machining Allowance ◽

Linear Friction ◽

Alignment Process ◽

Workpiece Localization ◽

Complex Parts ◽

Symmetric Block

Abstract Currently composite manufacturing process, such as linear friction welding plus NC machining, is the main method for the manufacturing and repairing of complex parts with integrated structure. Due to different datum position and inevitable distortion from different processes, it is important to ensure sufficient machining allowance for complex parts during the NC machining process. In this paper, a workpiece localization approach for machining allowance optimization of complex parts based on CMM inspection is developed. This technique concerns an alignment process to ensure sufficient stock allowance for the single parts as well as the whole integrated parts. The mathematical model of the constrained alignment is firstly established, and then the symmetric block solution strategy is proposed to solve the optimization model. Experiment result shows that the approach is appropriate and feasible to distribute the machining allowance for the single and whole parts for adaptive machining of complex parts. Highlights An approach for machining allowance optimization of complex parts based on CMM inspection is developed. An alignment process to ensure sufficient stock allowance for the whole integrated parts is concerned. The symmetric block solution strategy is proposed to solve the constrained alignment model.

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Research and Development on the Query Systems of NC Machining Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.764.91 ◽

2013 ◽

Vol 764 ◽

pp. 91-94

Author(s):

Jie Huang ◽

Jian Xin Shen

Keyword(s):

Research And Development ◽

Process Parameters ◽

System Architecture ◽

Cutting Parameters ◽

Nc Machining ◽

Machining Process ◽

Query System ◽

Access Database ◽

Query Systems ◽

Real Product

In this paper, the system architecture Integrated with cutting parameters database and process case database was proposed. Windows-based NC machining process query system was developed by using VB combined with access database, the system has turned the NC processing handbook into electronic handbook, at the same time, many real product process experiences was integrated in it, which effectively solved Electronic management of the NC machining process parameters and query. The employee can quickly accumulate experience by using the system and enrich their process acknowledge.

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An effective data mining approach of existing CAM models for NC machining process reuse

2017 IEEE 3rd Information Technology and Mechatronics Engineering Conference (ITOEC) ◽

10.1109/itoec.2017.8122327 ◽

2017 ◽

Author(s):

Rui Huang ◽

Yun Chen

Keyword(s):

Data Mining ◽

Nc Machining ◽

Machining Process ◽

Data Mining Approach

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Error Compensation of a NC Machining System Based on a Dynamic Feedback Neural Network

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.52-54.1890 ◽

2011 ◽

Vol 52-54 ◽

pp. 1890-1894 ◽

Cited By ~ 1

Author(s):

Huang Lin Zeng ◽

Yong Sun ◽

Xiao Hong Ren ◽

Li Xin Liu

Keyword(s):

Neural Network ◽

Error Compensation ◽

Nc Machining ◽

Machining Process ◽

Dynamic Feedback ◽

Machining System ◽

Nc Machine ◽

Feedback Neural Network ◽

Set Up ◽

Errors Analysis

Machining error of a NC machining system is a kind of comprehensive error in dynamically machining process; especially it is of errors with non-linear characteristics. In this paper, we will set up a kind of model of comprehensive errors analysis for a NC machining system and present an error compensation for high-precision a NC machining system by a dynamic feedback neural network embedded in a NC machine tool. The results obtained shows that this approach can effectively improve compensation precision and real time of error compensation on machine tools.

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The Analysis of Effects of Curvature Attribute on Interference in Freeform Surface Blade NC Machining

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.314-316.1783 ◽

2011 ◽

Vol 314-316 ◽

pp. 1783-1787

Author(s):

Ming Hai Wang ◽

Xiao Peng Li ◽

Yue Sun

Keyword(s):

Free Surface ◽

Gaussian Curvature ◽

Cutting Tool ◽

Nc Machining ◽

Mapping Method ◽

Surface Curvature ◽

Machining Process ◽

Processing Efficiency ◽

Intervention Process ◽

Curvature Parameter

This paper proposes the Gaussian Curvature by analyzing the free surface of the blade surface curvature, which is based on the Gaussian Curvature parameter mapping method to study the Gaussian curvature of free surface NC machining process interference. We introduce the conception of curvature to analyze the curvature and optimize the cutting parameter and cutting tool parameter to avoid interference phenomena happening and improve the processing efficiency and precision. Take the ball end cutter for example to process simulation, it shows that through the analysis of the free surface curvature method to avoid the intervention process is feasible, and has been verified by the experiment.

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