Papers by Keyword: Chip

Abstract: Possibilities of miniaturization of products are constantly increasing and create numerous technological challenges at the same time. One of the important aspects of the machining process, which is the essence of this work, is the geometry of the cutting tool. This work aims to investigate the influence of three different radius of cutting edge on the minimum thickness of machined layer. The phenomena on a typical incremental step were described using a step-by-step incremental procedure, with an updated Lagrangian formulation. The machining process is considered as geometrical and physical non-linear initial and boundary problem. The finite element method (FEM) and the dynamic explicit method (DEM) were used to obtain the solution. The application was developed in the ANSYS/LS-DYNA system which makes possible a complex time analysis of the physical phenomena: states of displacements, strains and stresses. Numerical computations of the strain have been conducted with the use of methodology which requires a proper definition of the contact zone, without the necessity to introduce boundary conditions. Examples of calculations are presented and show what the depth of cut at a given radius of cutting edge allows achieving a minimum thickness of cutting.

Abstract: In this article by the example of two abrasive materials from oxide of aluminum and nitride of boron, the processes developing in a thin surface layer between a grain of abrasive and the material, processed by microcutting with speeds of 40 and 160 m/s, the preforms from armko-iron, steels R18, 45, H18N10T and alloy titanium VT6 are investigated, using the scanning electron microscopy method.

Abstract: The article presents results of the research focused on suitability assessment of separated dust from formatting and grinding of cement-bonded chipboards to modify their composition. The attention was paid to dust treatment, i.e. milling and sorting. The dust was applied to chipboards in amounts of 5 and 10%. Formulas with water-cement ratio 0.60 and 0.65 were prepared. The influence of sorted dust was subsequently evaluated using setting of selected material properties. In particular the bending strength and tensile strength perpendicular to plate plane were monitored including the influence of frost on these characteristics.

Abstract: For hardware Trojan detection process is difficult to effectively extract the exact equivalent logic function of the target chip logic function is proposed based on contradictory truth table equivalent extraction scheme and key Enabling technologies. Designed to target chip waveforms attribute recognition model, through the analysis of multiple properties of the model and proof, the work is given waveform attribute recognition model parameter setting principles.

Abstract: Chip breaking is important during manufacturing processes. A method of chip breaking is described. Common high speed tool was selected as cutting tool. The convex stripe was made by the laser instrument on the rake of cutting tool. Cutting experiments of aluminum alloy were carried out with this kind of tools. Experimental results show that chip breaking of tools with convex stripe is easier than ordinary tools. And the chip shape is always arc. The chip created by tools with convex stripe breaks more easily when cutting depth is less than 0.5mm. There is no damage on cutting tool with this method which is simple for manufacture.

Abstract: We designed radiation effect experimental system including current measurement section and functional test section for Xilinx Zynq-7010 System on chip (SoC) and performed the Total Ionizing Dose (TID) experiment irradiated by Co60 γ-source on the chip. At the dose rate of 0.04 Gy(Si)/s, the total dose of 1.69 kGy(Si), the current value in the experiment increased first and then decreased. The test board got functional interruption at the gamma dose of 1.69 kGy(Si). The function of the board normalized after room temperature annealing and 70°C high temperature annealing except that the current value decreased by 28% compared to the current before irradiation. The mechanisms for the first TID test results on Xilinx SoC were deduced and discussed.

Abstract: Inspection on chips from oil system is an important method for modern aeroengine condition monitoring. Energy spectrum analysis technique is the most widely used and effective method in inspection on metal chips. In this method, size and quantity of chips are observed by scanning electronic microscope and qualitative and quantitative analysis of element contents are finished by energy dispersive spectrometer. Through above experiments, material type of metal chips can be analyzed and material mark can be determined by comparison with the materials list used in the aeroengine. In this article, characteristics and advantages of energy spectrum analysis technology are systematically introduced and typical appearance feature and energy spectrum curve of common l chips are summarized in engineering practice. In addition, problems and prospects of energy spectrum analysis technique are proposed.

Abstract: This paper deals with the up milling technology. It describes the coherencies of temperature and surface roughness achieved by this up milling process and explains the principle of up milling, briefly describes the heat generated too and shapes of chip. A main part of this paper is realization of the experiment, description of the experiment and evaluation of results shown as the resulting values of temperature and subsequent surface roughness and category of made chips. The milling is the most used technology in engineering and shape of chip is important for its transport and for economical aspect of this technology.

Abstract: The The basic hypothesis of this article focuses on the study of accompanying phenomenas in the cutting zone of the stainless steels, with regard to the elimination of occurrence of poor-quality holes when drilling into new austenitic ELC (Extra Low Carbon) stainless steels. The problem of drilling holes with diameter D=1 to 9 mm resides in the fact that 20 to 28 % of these holes do not comply with prescribed requested requirements. The result of the deformation is very often the unforeseen destruction of the cutting tools; therefore their operational tool life is reduced. This article presents the results of experiments focusing on the study of the plastic deformation of the chips, at drilling with diameter d=5 mm when drilling into a new austenitic ELC stainless steels. This study also includes an analysis of accompanying phenomena in the cutting zone by measuring some selected parameters. The results of the experiments were compared with Cr18Ni8 steel and then verified when drilling holes into specific products.

Abstract: The main aim of this contribution was monitoring of chip in the milling process by the evaluation of the volumetric coefficient of chip. The chip was monitoring during the peripheral up and down milling. Nowadays, the milling is the most used technology in engineering. The shape of chip is important for its transport and for economical aspect of this technology. This coefficient represents the shape of chip. The small chip has a lower volumetric coefficient, but the very small chip is not very desired in the cutting process, because they can fill some small spaces and damage the machine. But very long chip can damage tool and machine, too.