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Changing of the chip broadening ratio dependence upon the supply for “reverse” (a) and “direct” (b) schemes of cutting: t=0.3mm,s=0.3mm/rev, D=38mm
Source publication
In the given work we present the results of experimental estimation of chip shrinkage under turning with straight and radius cutters for two schemes of cutting: “direct” and “reverse”. Ratios of thickening, broadening and longitudinal shrinkage of the chip were established as shrinkage parameters. The given paper presents the graphic charts showing...
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Nowadays, the existing evaluation methods of chip breakability in industry are based on subjective visual evaluations of the chip formation during cutting or on a chip chart made after the tests. However, more sensitive methods are needed to provide more in-depth information.
Thus, this study proposes a method to better evaluate the chip breakabili...
Citations
... That significantly affects the machining quality. Deformation in machining (friction and cutting) contributes to structure formation [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Hence, they affect the physicomechanical properties of the surface and nearby layers of the product. ...
The influence of cutting (milling) on the surface roughness and undulation of AMg2 aluminum alloy with regular and ultrafine grain structure is considered. In the machining of materials with ultrafine grain structure, the surface quality is better than for materials with regular grain structure.
... There are numerous papers devoted to the use of this technology but only a few of them study in detail the structure and characteristics with further determination of all aspects of structural-phase states resulted from intense thermo-mechanical impact. Tribological behaviors, machinability, deformation behavior under specific loading conditions present the greatest interest and thus should be studied [6][7][8][9][10][11]. One of the starting points for developing such materials might be experimental works aimed to determine the effect of varying the process parameters on the material properties. ...
It was experimentally shown that optimal friction stir processing (FSP) parameters existed for Al-Cu-Mg alloy samples subjected to friction stir processing in the sense of obtained ultrafine metal strength and microstructure. FSP of this alloy resulted in the formation of a recrystallized grain zone. The deflection from optimal process parameters resulted in lower FSPed metal strength.
... Only few works were done on samples obtained by FSP. The specificity of mechanical processing of FSP nanostructured materials is another problem to be resolved within the framework of works done before [13][14][15]. This work is focused on studying the effect of FSP process parameters and sample dimensions of the structure and mechanical characteristics of Al-Mg alloy samples and is a part of a complex program intended to study the high-strength FSP aluminum alloys. ...
It was shown experimentally that both friction stir processing parameters and the workpiece thickness have their effect on structure and mechanical properties of the processed samples. Even the 10% deflection from the optimal values resulted in the essential mechanical strength reduction. It was observed that FSP showed a tendency to suppress the serrated yielding during the tensile testing.
... Modern solid state physics puts a lot of emphasis of the study of specific behavior of subsurface layer in deformation and fracture [1,2] since there is an interest to computer-aided modeling [3,4] as well as to development processes of surface modification and coatings [5][6][7][8]. One of the research methods that allows studying how the surface impacts the deformation behavior of materials is using samples made of FCC metal single crystals [9,10]. The use of single crystal samples allows studying the orientation dependence of deformation by sliding [11][12][13][14][15][16], compression or tension [17][18][19][20] simply by examining the surface deformation-induced pattern using optical microscopy and back scattered electron diffraction (EBSD). ...
Compression strain-induced surface pattern on copper single crystal faces was studied by means of optical, confocal laser and scanning electron microscopies. It was shown that apart from work-hardening effect of previously formed deformation macrobands there is a pure geometrical (size) effect which serves for changing the conditions for further deformation within the deformation macroband zones by folded structure formation.
... As a rule, the turning of an external cylindrical surface and the boring of an internal surface by means of traditional tools with a cutting tip are characterized by similar geometry and cross section of the cut layer, However, research has shown that the geometry and cross section of the cut layer in oblique turning by straight-edge tools differ from those in traditional turning [3][4][5][6][7][8]. In addition, straight-edge turning may be used in the finishing of nonrigid parts, according to research on the forces in turning [7,9] and the deformation of materials under different loads [10][11][12][13][14][15]. ...
In order to understand the shaping that results from a particular machining technique, the cross section of the cut layer must be determined. A method is proposed for calculating the parameters of the cut-layer cross section in oblique single-edge boring by a radial cutter. Formulas for the thickness and width of the cut layer are based on the main cutting parameters: the supply, the cutting depth, the diameter of the insert, and the diameter of the hole produced. The proposed calculations may be used in the design of the cutting tool and the machining process.
... The rational choice of the microtexture location and surface area is dictated by tool/workpiece interaction conditions [10][11][12]. Schematics of turning by a sharp blade tool is shown in Fig. 1 in comparison to that by craterworn tool. One can see from this figure that the chip/tool contact length during the blade turning is greater than that of with the crater-worn tool. ...
Microtexturing the metal cutting tool surfaces is a novel technique intended for enhancing the workability of these tools. The microtexturing is used in machining the titanium alloys for air-space applications for reducing the adhesion wear of metal cutting blades. This paper is focused on forming the microtextured dotted, banded and overlapped areas on the surfaces of high-speed steel samples. The treated areas have been examined using laser scanning microscopy for the microtexture pattern and roughness. It has been shown that the microtextured surfaces obtained on the high-speed steel samples were free of cracks. Surface pattern and roughness of all three microtextured areas have been examined and analyzed.
... Some of the known non-destructive control methods are suitable for this purpose [4]. The applicability of these methods for monitoring the tool/workpiece interaction is conditioned by the need of detailed understanding the metal cutting process by different tools [5][6][7]. To evaluate and control the cutting process parameters, which affect the machining accuracy, it is reasonable using the various sensors and transducers such as dynamometers, vibration and acoustic emission sensors, and eddy current sensors. ...
Monitoring of the edge clamped workpiece deflection during milling has been carried our using acoustic emission, accelerometer and eddy current sensors. Such a monitoring is necessary in precision machining of vital parts used in air-space engineering where a majority of them made by milling. The applicability of the AE, accelerometers and eddy current sensors has been discussed together with the analysis of measurement errors. The appropriate sensor installation diagram has been proposed for measuring the workpiece elastic deflection exerted by the cutting force.
The earthmoving of permafrost soil is a critical task for excavation of minerals and construction on new territories. Failure by abrasive wear is the main reason for excavation parts of earthmoving and soil cutting machines. Therefore investigation of this type of wear is a challenge for developing efficient and wear resistant working parts. This paper is focused on conducting tribological experiments with sliding the steel samples over the surface of diabase stone sample where abrasive wear conditions of soil cutting are modeled experimentally. The worn surfaces of all samples have been examined and transfer of metal and stone particles revealed. The acoustic emission (AE) signals have been recorded and related to the results of worn surface analysis. he acoustic emission (AE) signals have been recorded and related to the results of worn surface analysis. As shown the wear intensity correlates to that of acoustic emission. Both acoustic emission signal median frequency and energy are found to be sensitive to the wear mode.
The results of experiments with high load and sliding speed sliding conditions on tribologically mated pairs such as steel 1045/steel 1045 (test 1), steel 1045/basalt (test 2) and Hadfield steel/basalt (test 3) have been carried out in order to identify their response in terms of the acoustic emission and vibration signals. The steel to rock and rock to steel transfer has been revealed by examining the worn surfaces of both steel and rock samples with the use of laser scanning microscopy. The AE signal characteristics have been determined for the tribological pairs studied. The dynamics of sliding has been evaluated by measuring the vibration accelerations. Relationship between wear mode and either acoustic emission signal or vibration signal has been established. The minimal vibration oscillations amplitude and acoustic emission signal energy have been found out in sliding Hadfield steel/basalt pair.
