scholarly journals Statistical modeling, Sobol sensitivity analysis and optimization of single-tip tool geometrical parameters in the cortical bone machining process

2019 ◽  
Vol 234 (1) ◽  
pp. 28-38 ◽  
Author(s):  
Vahid Tahmasbi ◽  
Mehdi Safari ◽  
Jalal Joudaki
Keyword(s):  
Sensitivity Analysis ◽  
Cortical Bone ◽  
Surface Quality ◽  
Rake Angle ◽  
Cutting Edge ◽  
Numerical Control ◽  
Geometrical Parameters ◽  
Machining Parameters ◽  
Edge Angle ◽  
Input Parameters

Machining and cutting of cortical bones are very common and important in the field of orthopedic surgeries. Considerable advances in bone machining are obtained by using computer numerical control machines and automatic surgery robots but still, researches are needed to investigate the effects of machining parameters in bone machining. In this article, for the first time, the effect of geometrical parameters of the single-tip tool on cortical bone machining is studied. The machining parameters included in the investigation are rake angle, back rake angle and side cutting edge angle and the response surface methodology is used to analyze the obtained surface quality according to a second-order regression model. The sensitivity of surface quality to the input parameters was measured by applying Sobol sensitivity analysis and the results are optimized by the Derringer algorithm. Finally, the optimum tool is determined as 15° rake angle, −5° back rake angle and 30° side cutting edge angle. Furthermore, the sensitivity of the surface quality to the input parameters is determined as 52% for rake angle, 31% for side cutting edge angle and 17% for back rake angle.

Detektion von Schneidkantenversatz und Rautiefe/Surface quality and cutting edge offset detection

2021 ◽  
Vol 111 (11-12) ◽  
pp. 803-806
Author(s):  
Dominik Hasselder ◽  
Eckart Uhlmann
Keyword(s):  
Tool Wear ◽  
Austenitic Steel ◽  
Surface Topography ◽  
Surface Quality ◽  
Academic Research ◽  
Cutting Edge ◽  
Geometrical Parameters ◽  
Dry Turning ◽  
Nominal Diameter

Bei Drehbearbeitung auftretender Verschleiß am Werkzeug ist seit Jahrzehnten Gegenstand der Forschung, denn er beeinflusst die Oberflächengüte und den resultierenden Durchmesser des Werkstücks. Durch die gezielte Platzierung eines Triangulationssensors lassen sich Einflüsse dieser Art detektieren. In Zerspanungsuntersuchungen bei der Bearbeitung des austenitischen Stahls 1.4301 ohne Kühlmedium konnte gezeigt werden, dass der verschleißbedingte Durchmesserfehler und die hergestellte Oberflächentopografie prozesssicher messbar sind.   Tool wear and its detection has been part of academic research for decades. It may result in varying surface quality and is a potential cause of insufficient nominal diameter in turning. Mounting a triangulation laser on a turning tool allows for detecting variations in geometrical parameters of the workpiece. Also, when dry turning the austenitic steel 1.4301 it is possible to continuously detect the resulting surface topography and the discrepancy in the manufactured diameter.

The Effect of Cut Tool Geometric Parameters on Tool Tear of Machining Nickel-Base GH4169 Super Alloys

2010 ◽  
Vol 37-38 ◽  
pp. 1457-1461 ◽  
Author(s):  
Zhao Peng Hao ◽  
D. Gao ◽  
R.D. Han
Keyword(s):  
Tool Life ◽  
Cutting Speed ◽  
High Strength ◽  
Rake Angle ◽  
Geometric Parameters ◽  
Cutting Edge ◽  
Factors Affecting ◽  
Edge Angle ◽  
Coated Tools ◽  
Nickel Base

Nickel-based super alloy GH4169 has been widely used in aerospace industry because of its good mechanical properties under high temperature. However, it is difficult to machine for its high strength, poor thermal conductivity and serious work-hardening. The effects of tool geometric parameters on tool life are studied by machining experiments using YG8 tools with different cutting edge angle in this paper. The tool with cutting edge angle 45°has longer tool life than 75°. The cutting experiments have been carried out using TiAlN (PVD) coated tools (AC520U) with different rake angle. It shows that the tool life with rake angle 9° were increased by 50% and 25% compared to tool with rake angle 3°and 6° when cutting speed is 30m/min. The tool with rake angle 9° is not suitable for cutting GH4169 when cutting speed is more than 35m/min. The results show that geometric parameter of cutting tool is one of the important factors affecting tool life.

Study on Machinery Cutting Technology of Ceramic Parts

2011 ◽  
Vol 127 ◽  
pp. 163-167
Author(s):  
Dong Mei Jiang ◽  
Qiang Wang
Keyword(s):  
Programming Model ◽  
Orthogonal Cutting ◽  
Cutting Speed ◽  
Optimal Solution ◽  
Rake Angle ◽  
Processing Parameters ◽  
Cutting Edge ◽  
Edge Angle ◽  
Decision Making Unit ◽  
Tool Cutting

The machinability of ceramics is evaluated by data envelopment analysis, mathematical programming model is constructed, then the optimal solution of decision-making unit is found. These reference values of he tool rake angle, clearance angle, tool cutting edge angle, minor cutting edge angle, tool cutting edge inclination angle, tip ARC radius and cutting speed, back engagement and the range of feeds are obtained through by orthogonal cutting test, these processing parameters are optimized, then better processing results are achieved. Considering the problem of Machining of ceramic materials, the techniques of mechanical cutting process, ceramic turning, grinding, drilling, et al are discussed.

Tool Geometry Effect on Machined Surface Integrity in Precision Turning High-Strength Spring Steel

2004 ◽  
Vol 471-472 ◽  
pp. 380-384 ◽  
Author(s):  
H.X. Wang ◽  
Wen Jun Zong ◽  
Ying Chun Liang ◽  
Shen Dong
Keyword(s):  
Surface Roughness ◽  
High Strength ◽  
Rake Angle ◽  
Spring Steel ◽  
Cutting Edge ◽  
Tool Geometry ◽  
Machined Surface ◽  
Edge Angle ◽  
Precision Turning ◽  
Machined Surface Integrity

In this paper, Based on regression analysis of tests, three comprehensive experimental models were presented in precision turning high-strength spring steel, Vicker’s hardness, residual stresses and surface roughness can be predicted utilizing these models. And the influence of tool geometry on machined surface integrity was analyzed systematically. The analytical results show that Vicker’s hardness and compressive residual stress will increase with the decrease of rake angle, clearance angle, cutting edge angle or minor cutting edge angle, surface roughness increases with an increase of rake angle or clearance angle and decreases with an increase of cutting edge angle or minor cutting edge angle.

scholarly journals Soil-tool interaction of a simple tillage tool in sand

2019 ◽  
Vol 85 ◽  
pp. 08007
Author(s):  
Lucian V. Fechete-Tutunaru ◽  
Ferenc Gaspar ◽  
Zoltan Gyorgy
Keyword(s):  
Rake Angle ◽  
Cutting Edge ◽  
Factorial Experiment ◽  
Forward Speed ◽  
Response Variable ◽  
Independent Variables ◽  
Edge Angle ◽  
Draft Force ◽  
Tillage Depth ◽  
Soil Bin

This study was focused to experimentally evaluate the draft force on a simple tillage tool operating in different conditions in sand. The soil-tool interaction was evaluated in controlled laboratory conditions in a soil bin. A full multilevel factorial experiment was used with one response variable and four experimental factors. The selected design 3 tools × 3 tillage depth × 3 rake angle × 3 forward speed with two replications had a total of 243 runs. Influence of four independent variables including tillage depth (15, 20, 25 cm), rake angle (25, 35, 50 degrees), forward speed (0.67, 0.98, 1.39 m/s) and cutting-edge angle of the tool (30, 45 and 60 degrees) on draft force as the dependent variable was evaluated.

Influence of the Cutting Edge Angle of a Titanium Instrument on Chip Formation in the Machining of Trabecular and Cortical Bone

2014 ◽  
Vol 29 (4) ◽  
pp. 942-948 ◽  
Author(s):  
Constantin See ◽  
Marcus Stoetzer ◽  
Martin Ruecker ◽  
Max Wagner ◽  
Paul Schumann ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Chip Formation ◽  
Cutting Edge ◽  
Edge Angle ◽  
On Chip

scholarly journals Multi-factor influence on the roughness of the finished surface

2021 ◽  
Vol 25 (2) ◽  
pp. 161-171
Author(s):  
P. A. Sablin ◽  
V. S. Shchetinin
Keyword(s):  
Experimental Data ◽  
Dynamic Stability ◽  
Surface Quality ◽  
Factor Model ◽  
Cutting Conditions ◽  
Machining Process ◽  
Machining Parameters ◽  
Mechanical Processing ◽  
Finished Surface ◽  
Input Parameters

The aim of this work is to develop a novel approach for ensuring the quality of the finished surface based on a multi-factor model. The proposed model can take into account most of the machining process parameters. The main parameters include cutting conditions, dynamic stability of the cutting process, thermal effects in the cutting area. The development of a multi-factor model was based on a literature review and experimental data obtained from the cutting force analysis and colour pyrometry. The data obtained were summarised into a unified multi-factor model. We analysed the key literature sources and summarised the experimental data and findings to assure finished surface quality when controlling one of the input parameters of the machining process. It was shown that the surface quality (roughness) can be achieved by applying different machining parameters. They include the rational cutting conditions, a change in the geo m-etry of a cutting tool, reducing the relative spacial dynamic vibrations of the tool relative to the working surface of the raw part, using the methods influencing the physical and mechanical properties of the processed materials. It was established that the process dynamic stability, the cutting conditions or the chip formation process can be used as an input parameter. The proposed scheme of multi-factor influence of processing parameters on the output parameter - the surface roughness - applies to any materials under processing. The created model takes into account all input parameters of mechanical processing. It aims at the quality management of the finished surface based on the required performance characteristics of the items. Based on the proposed multi-factor scheme, we plan to create an adaptive system capable of controlling the mechanical processing based on a computer numeric control machining centre.

The Effect of Axial Cutting Edge Angle on the Axial Milling Force of Helical Milling

2012 ◽  
Vol 217-219 ◽  
pp. 1723-1728
Author(s):  
Shuo Zhang ◽  
Rui Hang Shi ◽  
Xin Guang Liang ◽  
Yong Xiang Hu ◽  
Zhen Qiang Yao ◽  
...  
Keyword(s):  
Qualitative Analysis ◽  
Process Parameters ◽  
Cutting Edge ◽  
Helical Milling ◽  
Geometrical Parameters ◽  
Milling Force ◽  
Edge Angle ◽  
Machining Quality ◽  
End Mills ◽  
Reasonable Choice

For decreasing axial milling force in helical milling and improving machining quality, researches have been carried out on end mills’ geometrical parameters. And experiments have also been designed to analyze the effect of end mill’s axial cutting edge angle on axial milling force. The results indicate that when other mills’ geometrical and process parameters are constant, the generated mean axial milling force is remarkably decreased, following the axial cutting edge angle’s little increase. In addition, as the pitch of helical milling path increases, larger axial cutting edge angle leads to higher relative decrease ratio. And a qualitative analysis is also put up to point out the reason for the phenomena above, that is, part of the low-speed region of axial cutting edge quits milling. These conclusions could supply valuable references to reasonable choice of combinations of mills’ geometrical and process parameters in helical milling.

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