Modeling and experimental verification of chip flow deviation in oblique cutting
TL;DR: In this paper, the authors have incorporated the concept of effective inclination angle in the models for predicting chip flow direction in oblique cutting, which has been validated against the experimental data while turning two different medium carbon steels with uncoated carbide inserts over a wide domain of depth of cut, feed, cutting velocity, nose radius, rake angle, inclination angle and principal cutting edge angle.
Abstract: The reasons for chip deviation from the orthogonal direction in machining are (i) restricted cutting effect, (ii) nonzero inclination angle, and (iii) tool-nose radius. The present article has incorporated the concept of effective inclination angle in the models for predicting chip flow direction in oblique cutting. Model 1 takes into account the role of the effective principal cutting edge angle (as point function) and the concept of effective inclination angle has been incorporated in the model. Model 2 addresses the same roles but determined as path functions. Models 1 and 2 do not address the variation in the chip load along the width of cut. This has been addressed in Model 3 along with effective inclination angle. The models have been validated against the experimental data while turning two different medium carbon steels with uncoated carbide inserts over a wide domain of depth of cut, feed, cutting velocity, nose radius, rake angle, inclination angle and principal cutting edge angle. The m...
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TL;DR: In this paper, the impact of the angle λs on the minimum uncut chip thickness of C45 steel with sintered carbide edges S3OS with rn = 18, 28, 90μm, respectively.
18 citations
TL;DR: In this article , the effect of edge inclination angle λ s in the range of 0° to 60° on the minimum uncut chip thickness (MUCT) was investigated in radial-free turning of C45 steel.
Abstract: Abstract The minimum uncut chip thickness (MUCT) is an important phenomenon observed both in orthogonal and oblique cutting. Rounding the cutting edge influences the initiation of the cutting process and chip formation. In a previous study, the authors presented a theoretical analysis and experimental validation on the effect of edge inclination angle λ s in the range of 0° to 60° on h min in radial-free turning of C45 steel. The current work investigated the MUCT h min in oblique cutting process of C45 steel, for extremely high value of edge inclination angle λ s . In this research, a special technique based on milling tool machine using a special tool and sample is presented. Enabled model tests in the unprecedented range of angles λ s not used in research to date. The samples were machined using a cutting speed v c = 0.063 m/min. Vertical feed of edge f v was determined by association on the applied sample slope ( τ = 0.60–0.85 mm/m) and cutting speed v c . as f v = 37.8—53.5 μm/min. MUCT h min parameter was measured using compensation for the effects of deformation, based on profilogram analysis. The machining experiments were carried out using a tool with r n = 185 μm. It was found that in the range of angles of 50° ≤ λ s ≤ 85°, the MUCT decreases from h min = 12 μm for λ s = 50° to h min = 4 μm for λ s = 85°. Increasing λ s by 35° resulted in up to threefold reduction in MUCT. The analysis of the experimental results of h min for the range of studied λ s angle confirmed authors previously reported theory for extreme values of λ s . In optimization procedure based on LSM, chip flow angle coefficient was determined as k = 0.75 and critical value of rake angle γ cf = -64.8°. This feature provides prediction of results with great accuracy to experimental value. The findings from this study opens the possibility of developing new tools for finishing operations in the field of oblique cutting with high values of λ s angle. In addition, the results introduce new area for research on improving the surface quality based on lowering the effect of MUCT on surface roughness and explaining some aspects related to surface wear in the friction process.
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References
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01 Jun 1951
TL;DR: In this article, a full geometrical analysis of a cutting tool edge is made, in which an effective rake of universal application is defined in terms of the primary rake and the angle of obliquity of the edge.
Abstract: A full geometrical analysis of a cutting tool edge is made, in which an effective rake of universal application is defined in terms of the primary rake and the angle of obliquity of the edge. The f...
214 citations
"Modeling and experimental verificat..." refers background or methods in this paper
...The inclination angle along the effective principal cutting edge (AB) would be algebraically additive as has been proposed by Stabler (1951)....
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...(b) Presence of inclination angle λ ( =0) (Stabler, 1951, 1955; Shaw et al., 1952; Merchant, 1944)....
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...(i) The firstmodel is amodification of the ‘existing Colwell model’ (Colwell, 1954) with correction for inclination angle as per ‘Stabler rule’ (Stabler, 1951) as a point function....
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01 May 1987
TL;DR: In this paper, a model is presented for predicting the chip flow direction and cutting forces for bar turning with nose radius tools, and a comparison which is made of predicted and experimental results shows excellent agreement.
Abstract: A model is presented for predicting the chip flow direction and cutting forces for bar turning with nose radius tools. A comparison which is made of predicted and experimental results shows excellent agreement.
99 citations
"Modeling and experimental verificat..." refers background or methods in this paper
...For ease of calculation, the total chip load is divided into three different segments (Young et al., 1987) (namely ABG, BCFG and CDEF), which are shown in Figure 7....
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...Model 3 This model has been evolved from the models proposed by Okushima and Minato (1957) and Young et al. (1987)....
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...Okushima andMinato (1957) introduced an effective principal cutting edge angle similar to Young et al. (1987) by path function but they did not introduce the effect of restricted cutting effect....
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...It was proposed by Colwell (1954) and Young et al. (1987)....
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...(Young et al., 1987) Figure ....
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01 Aug 1995
TL;DR: In this article, a method is described for calculating the chip flow direction in terms of the tool cutting edge geometry and the cutting conditions, namely feed and depth of cut, and it is shown how cutting forces can be predicted given the work material's flow stress and thermal properties.
Abstract: A method is described for calculating the chip flow direction in terms of the tool cutting edge geometry and the cutting conditions, namely feed and depth of cut. By defining an equivalent cutting edge based on the chip flow direction it is then shown how cutting forces can be predicted given the work material's flow stress and thermal properties. A comparison between experimental results obtained from bar turning tests and predicted values for a wide range of tool geometries and cutting conditions shows good agreement.
86 citations
TL;DR: In this article, the problem of defining the rake angle which controls the cutting process in oblique machining is considered, and it is concluded from the experimental results that the rake angles normal to the cutting edge are of greatest significance.
66 citations
"Modeling and experimental verificat..." refers background in this paper
...It can be said that the direction of chip flow coincides with the direction of resultant thrust force (Brown and Armerago, 1964; Russell and Brown, 1965; Lin and Oxley, 1972; Young et al. 1987)....
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Patent•
25 Jan 1983
TL;DR: In this article, a body is mounted in support levels and a BEARING THRUST AXIS is fixed by an overhang extension of a tree-cutting tree, where the strength of the body varies with the length of the tree.
Abstract: RESPECT THE INVENTION The METALWORKING BY CUTTING. The ROTARY CUTTING TOOL BEING SUBJECT TO THE INVENTION IN WHICH INCLUDES A BODY IS MOUNTED IN SUPPORT LEVELS AND BEARING THRUST AXIS WHICH IS FIXED dOOR OVERHANG ELEMENT CUTTING AND IS CHARACTERIZED BY THE NEAREST BEARING ELEMENT CUTTING IS MOUNTED IN THE BODY THROUGH A BUSH HAVING A CENTRAL PART 17 OF WHICH THE STRENGTH CONSTANT IS FOLLOWING ITS LENGTH AND SCOPE OF WHICH THE SURFACE 18 IS cONJUGATED SURFACE INDOOR 19 BODY AND IDENTICAL TO THAT, AND EXTREME 20 PARTS, 21 WHOSE STRENGTH VARY FOR MAXIMUM VALUE TO A MINIMUM VALUE FOLLOWING THEIR LENGTH IN THE DIRECTION OF UP TO THE FRONT END 22, 23 cORRESPONDENT OF bUSH AND NEXT LESPERIMETRES OF ITS PARTS EXTREME 20, 21, SUCH VALUES MAXIMUM AND MINIMUM OF SUCH STRENGTH PARTS EXTREME 20 21 THE BUSH IS LOCATED IN PLAN EVEN. The OUTI THE QUESTION MAY BE USED IN PARTICULAR IN THE INDUSTRY PULP AND PAPER FOR FINISHING ROLLS CALENDER FOR PRINTING ON PAPER.
61 citations