scholarly journals UTILIZING RESPONSE SURFACE METHODS DESIGNS FOR OPTIMIZATION OF TECHNOLOGICAL PARAMETERS ON THE VIBRATION AMPLITUDE OF CNC ROUTER SPINDLE

2021 ◽  
Vol 11 (1) ◽  
pp. 34-44
Author(s):  
Nguyen Huu Loc ◽  
Nguyen Phuoc Hung
Keyword(s):  
Response Surface ◽  
Vibration Amplitude ◽  
Machining Accuracy ◽  
Cnc Machine ◽  
Technological Parameters ◽  
Factors Affecting ◽  
Response Surface Methods ◽  
Cnc Router ◽  
Working Parameters

For CNC machines, machining accuracy is of ultimate importance since it determines the quality of the products. Among many factors, vibration amplitude and stiffness are the key ones that influence the machining accuracy of a CNC machine. Remarkably, it is essential to conduct study into structural stiffness and the effect of technological parameters on the vibration amplitude of CNC router spindle with various second-order designs in order to improve machining accuracy. The research focuses on the application and comparison of the response-surface methods, the experimental research on the factors affecting the vibration amplitude, and the determination of the optimal working parameters for the CNC router.

Accuracy Measurement and Error Compensation of Three-Axis CNC Milling Machine

2014 ◽  
Vol 651-653 ◽  
pp. 616-619 ◽  
Author(s):  
Jin Ying Chen
Keyword(s):  
Error Compensation ◽  
Laser Interferometer ◽  
Cnc Machine Tools ◽  
Machining Accuracy ◽  
Milling Machine ◽  
Cnc Milling ◽  
Cnc Machine ◽  
Factors Affecting ◽  
Accuracy Measurement ◽  
Cnc Milling Machine

Through the methods using combination ball-bar with laser interferometer, we carry on accuracy measurement and error compensation of three-axis CNC milling machine. We finally find out the main factors affecting the machining accuracy of machine tool. In the meantime we can improve repeatability of positioning accuracy and the machine's positioning and meet the processing needs by means of the existing error compensation of the CNC machine tools.

scholarly journals The Use of Response Surface Methodology to Optimize Parameter Adjustments in CNC Machine Tools

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Shao-Hsien Chen ◽  
Wern-Dare Jehng ◽  
Yen-Sheng Chen
Keyword(s):  
Regression Analysis ◽  
Response Surface ◽  
Machine Tools ◽  
Cnc Machine Tools ◽  
Contour Plot ◽  
Machining Accuracy ◽  
Analysis Method ◽  
Cnc Machine ◽  
Acceleration And Deceleration ◽  
Feed Axis

This paper mainly covers a research intended to improve the circular accuracy of CNC machine tools and the adjustment and analysis of the main controller parameters applied to improve accuracy. In this study, controller analysis software was used to detect the adjustment status of the servo parameters of the feed axis. According to the FANUC parameter manual, the parameter address, frequency, response measurements, and the one-fourth corner acceleration and deceleration measurements of the machine tools were adjusted. The experimental design (DOE) was adopted in this study for taking circular measurements and engaging in the planning and selection of important parameter data. The Minitab R15 software was adopted to predict the experimental data analysis, while the seminormal probability map, Plato, and analysis of variance (ANOVA) were adopted to determine the impacts of the significant parameter factors and the interactions among them. Additionally, based on the response surface map and contour plot, the optimal values were obtained. In addition, comparison and verification were conducted through the Taguchi method, regression analysis to improved machining accuracy and efficiency. The unadjusted error was 7.8 μm; through the regression analysis method, the error was 5.8 μm and through the Taguchi analysis method, the error was 6.4 μm.

Experimental Research on Surface Roughness in Turning of E355 Alloy Steel on CNC Machine Tool

2015 ◽  
Vol 760 ◽  
pp. 385-390 ◽  
Author(s):  
Filip Furdui ◽  
Carmen Adriana Cîrstoiu
Keyword(s):  
Surface Roughness ◽  
Cutting Parameters ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Factors Affecting ◽  
Cnc Lathe ◽  
Conventional Machine ◽  
Cutting Regimes ◽  
Cutting Speeds

This work suggests some possibilities of determination of cutting conditions for the cutting process.The most important factors affecting the surface roughness of machined sourfaces are the cutting parameters. It was shown in the paper the influence of finishing cutting regimes, for a given geometry of insert, on surface roughness of turned surfaces on CNC lathe, with higher cutting speeds than those used on conventional machine tools and with very small advances and cutting depths, thus explaining certain phenomena that occur in the cutting process.

scholarly journals SELECTION OF OPTIMAL MACHINING STRATEGY IN THE MANUFACTURE OF ELEMENTS BOUNDED BY CURVILINEAR SURFACES

2013 ◽  
Vol 7 (1) ◽  
pp. 5-10 ◽  
Author(s):  
Łukasz Czerech
Keyword(s):  
Cnc Machine Tools ◽  
Machining Accuracy ◽  
Cnc Machine ◽  
Technological Parameters ◽  
Machining Strategy ◽  
Cad Cam ◽  
The Impact ◽  
Cam Software ◽  
Selection Of

Abstract Increasing machining accuracy realized on CNC machine tools causes that the more frequently surfaces machined with this technique are not subject to further finishing processing and directly affects on the final quality of the product. Achieving geometric accuracy established by the constructor is the problem that modern technologists and CAD/CAM programmers have to faced with. The paper presents the influence of toolpath tolerance and machining strategy available in CAD/CAM software on the constituting process of technological surface layer for elements limited with curvilinear surfaces. The impact of the above mentioned parameters on the location and direction of geometrical deviations were also analyzed. Following article is part of research of the impact of selected technological parameters on the freeform surfaces geometric structure manufactured on CNC machines

Optimized Vortex-Assisted Dispersive Liquid–Liquid Microextraction Coupled with Spectrofluorimetry for Determination of Aspirin in Human Urine: Response Surface Methodology

2020 ◽  
Vol 16 (2) ◽  
pp. 201-209
Author(s):  
Zahra Tamiji ◽  
Maryam Salahinejad ◽  
Ali Niazi
Keyword(s):  
Response Surface ◽  
Human Urine ◽  
Method Development ◽  
Low Cost ◽  
Linear Calibration ◽  
Factors Affecting ◽  
Relative Standard ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Background: A Vortex-assisted dispersive liquid-liquid microextraction (VA-DLLME) method is presented for the determination of aspirin (acetylsalicylic acid) in human urine by spectrofluorimetry. Objective: To determine trace levels of aspirin in biologic samples by using green and low-cost method development. Methods: For the microextraction procedure, chloroform and acetonitrile were used as extraction and disperser solvent, respectively. The factors affecting the efficiency of extraction such as volume of chloroform, volumes of acetonitrile, ionic strength, sample pH, centrifuging time, and extraction time were investigated. Then significant variables were optimized by the response surface method using the Box- Behnken design. Results: Under the optimum extraction conditions, a linear calibration curve in the range of 0.1 to 130 ng mL-1 with a correlation coefficient of R2 = 0.998 was obtained. The limits of detection (LOD) and limits of quantification (LOQ) were 0.031 and 0.103 ng mL-1, respectively. The relative standard deviations (RSD) were less than 4%. Conclusion: Enrichment factor and recoveries were achieved for the extraction of aspirin in human urine. This method gives a rapid, simple, sensitive and environmentally friendly for the measurement of trace amount aspirin.

scholarly journals INVESTIGATION OF HOLE CYLINDRICAL SURFACE FORMATION PROCESS AT STRATEGY OF FINISH MILLING BY END-MILLING CUTTERS WITH CIRCULAR INTERPOLATION

2019 ◽  
Vol 2019 (5) ◽  
pp. 25-31 ◽  
Author(s):  
Владимир Давыдов ◽  
Vladimir Davydov ◽  
Вадим Стельмаков ◽  
Vadim Stel'makov ◽  
Александр Сарыгин ◽  
...  
Keyword(s):  
End Milling ◽  
Initial Point ◽  
Machining Accuracy ◽  
Technological Parameters ◽  
Form Accuracy ◽  
Factors Affecting ◽  
Optimum Range ◽  
Measurement Experiment ◽  
Circular Interpolation ◽  
Regressive Analysis

The purpose of this work was an analysis of factors affecting the form accuracy of holes obtained in the course of finish milling with a circular interpolation. To achieve the purpose in the work there is of-fered an application of theoretical methods (analysis, synthesis, comparison, abstracting, generalization, in-duction, deduction, modeling and others) and also em-pirical methods (observation, measurement, experiment, forecasting). On the basis of experimental investigation results it was defined that an index of deviation from a circle is influenced considerably by such geometrical and technological parameters of an end-milling cutter as a penetration radius, an angle of the initial point of a penetration radius and a feed set at tool penetration into blank material. For the parameters mentioned above and with the purpose of the optimum range definition in the choice of their values and for the increase of machining accuracy there is carried out a multifactor regressive analysis the result of which became a regressive model and a diagram of its surface characterizing it. It should be essential to mention that in the course of the analysis of the value of the deviation from a cylinder form there was developed and tested a simulator of cutter elastic deformation during the strategy of milling with a circular interpolation a maximum discrepancy of experimental and theoretical values made 15%.

Modeling of dynamic mosaicism on ring chromosomes in human fibroblasts and IPSCS

2020 ◽  
pp. 12-13
Author(s):  
Т.В. Никитина ◽  
А.А. Кашеварова ◽  
М.М. Гридина ◽  
А.А. Хабарова ◽  
А.Г. Мензоров ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Human Fibroblasts ◽  
Cellular Heterogeneity ◽  
Mitotic Stability ◽  
Factors Affecting ◽  
Ring Chromosomes ◽  
Cell Clones ◽  
Mitotic Instability ◽  
Mitotic Behavior

Митотическая нестабильность кольцевых хромосом может приводить к появлению клеточных клонов с различной генетической структурой. В качестве модели нестабильности кольцевых хромосом в митозе мы использовали фибробласты от пациентов с r(8), r(13), r(18) и r(22) и полученные из них индуцированные плюрипотентные стволовые клетки (ИПСК). Линии ИПСК с r(22) имели относительно стабильный кариотип на протяжении десятков (до 60) пассажей и сохраняли неизменную структуру кольцевой хромосомы. Кариотип линий ИПСК с r(8) и r(18) на ранних пассажах стабильный, планируется его изучение на поздних пассажах. Наибольшее разнообразие кариотипа выявлено в линиях ИПСК с r(13), в которых наблюдали различные перестройки и выраженную клеточную гетерогенность. Определение факторов, влияющих на митотическую стабильность кольцевых хромосом, может иметь значение для консультирования пациентов. Mitotic instability of ring chromosomes can lead to the appearance of cell clones with different genetic structure. IPSCs from fibroblasts of patients with r(8), r(13), r(18), and r(22) were used as a model of ring chromosomes mitotic behavior. Karyotypes of iPSC lines with r(8) and r(18) have so far been evaluated only in the early passages, lines with r(22) have maintained a relatively stable karyotype up to 60 passages. The occurrence of rearrangements and cellular heterogeneity was found characteristic for r(13) iPSCs. The determination of factors affecting the ring chromosomes mitotic stability would be beneficial for the patient’s prognosis.

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