The three-dimensional printing is a manufacturing method involving the addition of materials by using certain principles valid in printing techniques. There are various techniques of a three-dimensional printing method and the most of them could be applied inclusively to generate objects of polymers. The objective of the research presented in this paper was to analyze the capabilities of 3D printing process or equipment of generating fine details and to identify a way of evaluating these capabilities when using polyester PLA as filament material. The systemic analysis of the printing techniques which use a fused polymer filament deposition showed that there are some groups of factors able to affect the obtaining of fine details. An experimental research was designed in order to highlight the influence exerted by the diameter of the nozzle orifice and by the values of sharp angles of isosceles triangles on the heights of these triangles, thus obtaining an image concerning the possibilities of generating sharp edges by three-dimensional printing. To evaluate the capacity of the 3D printing process of obtaining thin walls, a spiral including linear segments with a decreasing thickness from 1 mm was also achieved on the test piece. By mathematical processing of the experimental results using a specialized software, empirical mathematical models were determined to evaluate the intensity of influences exerted by the two process input factors on the heights corresponding to isosceles triangles characterized by sharp angles.
It is known that in the cutting processes, due to the parameters variation of the working regimes, to the unevenness of the cutting depth, to the physico-mechanical characteristics of the processed material, to the existence or nonexistence of the coolant oiling, can appear more or less an accentuated wear of the cutting tools. All this factors have a dominant and negative influence on the durability, fact that impose being necessary taking into account some measures to increase the values of the cutting tools and/or of theirs cutting plates durability. In this sense are known various coating by deposition in vacuum researches (vacuum thermal evaporation and condensation from the vapor phase, ionic plating, vapour chemical deposition at low pressure, and so on) of some different filler materials, in thin layers, having protection role for the cutting plates, to increase the edge hardness to the superficial layer and of the tool locating and clearance surfaces and respectively, of their wear resistance. For this purpose, the authors propose to improve cutting tools durability using the deposition method by ionic plating in vacuum (PVD) of the thin titanium layers, following the cutting tools behavior in operation treated in this way. It was so studied the metal carbide cutting plates wear variation, coated with a titanium thin layer and it was determinated the cutting plates durability increasing, in comparison with those untreated. This research is usefull for predicting the lifetime of the cutting tools and/or of theirs cutting plates durability, after the titanium thin layer application, with a significant cost reduction.
The problem approached in this paper refers to designing a device for wire electrical discharge machining (EDM) which can be used on a ram electrical discharge machine. Usually, wire electrical discharge machine is applied only on specialized electrical discharge machines. The device proposed in the paper will ensure widening the technological possibilities of the given ram EDM equipment. A principle schema of the device was established, after analyzing the main requirements specific to the device service. One took into consideration a possibility to rotate and fix the subassembly for guiding the wire electrode so that the active zone of the wire tool electrode has a horizontal, vertical or even inclined position. Another requirement was to ensure a way for achieving machining processes in cavities existing in workpieces of higher dimensions. Functioning of the designed device and strain resistance of some components were tested by using CATIA V5 software. Some optimization possibilities for this constructive solution of the device were identified.
<p class="TTPAbstract">Nonconventional machining methods are based on the transfer of the energy to the work zone in ways distinct from those applied in the case of the so-called classical machining methods. A group of nonconventional machining methods achieve material removal from workpiece by using the motion of the electrical charged particles in a liquid. Practically, some machining techniques included in the larger groups of electrical discharge machining and in electrochemical machining are based on the motion of electrical charged particles in fluid. The problem addressed in this paper is to identify the zones where differences between the two groups of machining methods appear. A theoretical analysis was developed in order to identify the common aspects and respectively the differences between the electrical discharge machining and electrochemical machining, if the machining liquid is considered. Some experimental tests were developed to highlight aspects specific to the above mentioned machining techniques. The research facilitated obtaining a more complete image of some common and distinct characteristics of electrical discharge machining and electrochemical machining. The significance of the electroconductive or insulating properties of the work liquid was highlighted.<o:p></o:p></p>
The laser beam could be obtained by means of a laser diode. The amplification process develops inside the optical fiber. In the laboratory for nonconventional technologies from the Gheorghe Asachi Technical University of Iași, there is an ytterbium fiber laser equipment able to ensure conditions for obtaining a laser spot having a diameter of 30 μm diameter and a wavelength of 1070 nm. This paper purpose is to highlight the solutions that we may consider for a workpiece clamping device. On the bases of the general known information concerning the devices used in order to machine workpieces on machine tools, an ideas diagram was elaborated. Finally, a device practical solution was designed and materialized, this device was used in order to develop some experimental researches.
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