Article presents the process of the chip creation during orthogonal turning of the pure titanium tube. During laboratory tests two tools were used, with different shape of the rake face. The high-speed camera PHANTOM v 5.2, with NIKKOR 200 mm prime lens, was used to record the images. The obtained sequences significantly helped in the analysis of the process of chip creation, and allowed to carry out additionally analysis by using Tracker software.
Drilling of difficult-to-cut materials like titanium alloy is a complex machining operation. Due to the tool trajectory, the chip thickness changes along the cutting edges and during the tool movement. The aim of this study is to develop a drilling simulation model depending on the tool geometry and cutting data in order to control the final quality of the machined borehole through the size of burrs. First the geometry of the chip is modelled taking into account the parameters defining the tool trajectory and its geometry. An experimental study validates the modelling through vision camera observations. From this modelling it is possible to optimize the cutting data and cutting tool geometry in order to control the burrs size and thus the final quality of the borehole.
Article presents the results of turning process simulation research, carried out with a use of specialized software based on FEM method. On the basis of test results, temperature distribution on the rake face of the cutting tool was determined. C45 steel was adopted as the workpiece material, and the sintered carbide, without a protective coating – as the tool material. Material models of the C45 steel were built using the Johnson-Cook constitutive equation and material constants available in the literature. Research scope included the simulation of the orthogonal turning process, considering different levels of rake face wear.
The paper presents the results of 2D simulation, which were carried out to determine the state of the the cutting edge during the machining process. Steel AMS 6265 was selected as a material model, which was based on the Johnson-Cook equation. Sintered carbide was adopted as a tool material. Parameters of the machining process, like cutting speed and feed rate were changed in simulations. The impact of these changes on the forces in the X and Y axes of the cutting tool and the changes in temperature occurring on the rake face have been observed. The scope of the research included the changes in the Johnson-Cook material model: the dynamic hardening coefficient - C, thermal softening exponent - m and strain hardening exponent - n.
The aim of the study is to analyze the friction coefficient in the machining zone during turning of a cylindrical workpiece of corrosion-resistant steel 17-4PH. The measurements were conducted during machining on the faces of a workpiece on a Masterturn 400 lathe with set machining parameters. A measurement stand enabling the recording of machining forces was proposed and installed. The theory of building computer simulation models and analysis of these models were also studied. The results of 2D computer simulations were used to analyse stress and friction coefficient in 10 points on the rake face of the tool.
The paper describes a measuring stand which allows recording physical phenomena during the turning. The stand allows
recording the temperature in the machining zone, cutting forces and fast-changing images. The temperature in the
machining zone was recorded using a FLIR SC 620 thermographic camera, and the obtained thermograms were analysed
using the ThermaCam Researcher application. A PHANTOM v 5.2 camera with a NIKKOR 200 mm prime lens and
CineViewer software was used to record and analyse the fast-changing images. The cutting forces were recorded in a
measuring path which comprised a KISTLER 9257B dynamometer, KISTLER 5070A charge amplifier, and DynoWare
software. The laboratory tests involved verification of the correct operation of this stand. The turning tests were
performed on an elongated workpiece made of hard-machinable steel. The analysis of results allows a verification of the
correct operation of the stand.
The paper has aimed at presentation of the possibilities of using computer-based techniques into scope of machine cutting processes, and mostly of analytical and numerical modeling of the milling process for austenitic high-alloy chromium-nickel steel X 5 CrNi 18-10 and verification of the results experiments. The study was mostly focused on measuring and assessment of deformations in the given sample with the specific load. The simulations were executed in modern computer simulation software which supports such activities. These include: NX by Siemens and Simulia Abaqus. The selection of parameters was based on the real values measured during the milling process.
The paper presents research concerning temperature distribution in cutting zone in AMS 5643 steel turning with the help of a thermal imaging camera. Experimental studies served for the verification of the material model, used in simulation examinations for the optimization of cutting data.
The article presents a study on deformation of thin-walled components during milling. In the practical part, the test position consisting of conventional milling machines, high-speed camera and piezoelectric dynamometer was prepared. Milling operations performed on samples prepared of ST3S steel. Cutting parameters for each sample were the same, the way of mounting the samples in a holder constituted the difference. The tests were made for conventional and climbing milling. During the tests, deformation of samples was recorded with the high-speed camera. Moreover, the cutting forces were also recorded. In the second part of the article, the work in NX application was described. Geometric models of samples and material model were built, and simulation of deformation of the samples was performed. A comparison of the deformation results obtained from the laboratory tests and simulations constitutes a summary of the article.
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