Investigation of the Effect of Cutting Conditions and Tool Edge Radius on Micromachining with the Use of the Finite Elements Method

2015 ◽  
Vol 2 (1) ◽  
pp. 26-37
Author(s):  
Angelos P. Markopoulos ◽  
Christos Hadjicostas ◽  
Dimitrios E. Manolakos
Keyword(s):  
Size Effect ◽  
High Efficiency ◽  
Cutting Conditions ◽  
Tool Geometry ◽  
Manufacturing Processes ◽  
Third Wave ◽  
Fem Model ◽  
Tool Edge ◽  
Aisi 1045 ◽  
Made In

Micromachining comprises manufacturing processes that are in the forefront of contemporary industry. The need for high efficiency, high precision, better quality and lower cost makes the study of these processes and the phenomena of the micro regime that accompany, e.g. the size effect, of great importance. The quite popular for modeling manufacturing processes Finite Element Method is applicable in micromachining, too. However, assumptions and simplifications need to be made in order to provide a realistic simulation. In the present paper a numerical simulation using the Third Wave AdvantEdge® software is presented. A FEM model of micromachining of AISI 1045 is used for a parametric analysis of the simulation of micro-cutting. The effect of cutting conditions and tool geometry are investigated and size-effect theories are tested with the aid of the numerical model. From the analysis several useful conclusions are drawn.

Selection of Optimal Tool Geometry and Cutting Conditions in End Milling With Graphite as a Solid Lubricant

2004 ◽  
Author(s):  
N. Suresh Kumar Reddy ◽  
P. Venkateswara Rao
Keyword(s):  
Solid Lubricant ◽  
End Milling ◽  
Cutting Speed ◽  
Cutting Conditions ◽  
Tool Geometry ◽  
Cutting Fluids ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
1045 Steel ◽  
Coated Carbide

Coolants dissipate the heat generated during machining and hence improve productivity, machinability, etc. However, the use of cutting fluids in machining operations may seriously degrade the quality of environment. So, in recent years researchers have started machining with the use of solid lubricants with the aim of improving machining performance and overcome some of the limitations that arise with the use of cutting fluids or while machining dry. This paper deals with an investigation on using graphite as a solid lubricant to reduce the heat generated at the milling zone for improving the surface roughness of the machined AISI 1045 steel. An experimental setup has been developed to maintain constant flow rate of graphite powder continuously on to the workpiece and tool interface zone. The experimental studies have been conducted to see the effect of tool geometry (radial rake angle and nose radius) and cutting conditions (cutting speed and feed rate) on the machining response such as surface finish in solid lubricant assisted machining using four fluted solid TiAlN coated carbide cutters. Results indicate that there is a considerable improvement in the performance of milling AISI 1045 steel using graphite as a solid lubricant when compared with machining with cutting fluids. An attempt has also been made to select optimum tool geometry and cutting conditions in end milling with graphite as a solid lubricant by using the prediction model obtained from these experimental results.

scholarly journals Pathogenesis and Potential Therapeutic Targets for Triple-Negative Breast Cancer

Cancers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2978
Author(s):  
Chia-Jung Li ◽  
Yen-Dun Tony Tzeng ◽  
Yi-Han Chiu ◽  
Hung-Yu Lin ◽  
Ming-Feng Hou ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Targeted Therapy ◽  
Triple Negative Breast Cancer ◽  
Triple Negative ◽  
High Efficiency ◽  
Early Recurrence ◽  
New Developments ◽  
Great Progress ◽  
Low Toxicity ◽  
Made In

Triple negative breast cancer (TNBC) is a heterogeneous tumor characterized by early recurrence, high invasion, and poor prognosis. Currently, its treatment includes chemotherapy, which shows a suboptimal efficacy. However, with the increasing studies on TNBC subtypes and tumor molecular biology, great progress has been made in targeted therapy for TNBC. The new developments in the treatment of breast cancer include targeted therapy, which has the advantages of accurate positioning, high efficiency, and low toxicity, as compared to surgery, radiotherapy, and chemotherapy. Given its importance as cancer treatment, we review the latest research on the subtypes of TNBC and relevant targeted therapies.

New Development in High Efficiency Deep Grinding

2012 ◽  
Author(s):  
Andre D. L. Batako ◽  
Valery V. Kuzin ◽  
Brian Rowe
Keyword(s):  
Machine Tool ◽  
High Efficiency ◽  
Machining Process ◽  
Depth Of Cut ◽  
Removal Rates ◽  
Workpiece Surface ◽  
New Development ◽  
Cutting Processes ◽  
Selection Of ◽  
Made In

High Efficiency Deep Grinding (HEDG) has been known to secure high removal rates in grinding processes at high wheel speed, relatively large depth of cut and moderately high work speed. High removal rates in HEDG are associated with very efficient grinding and secure very low specific energy comparable to conventional cutting processes. Though there exist HEDG-enabled machine tools, the wide spread of HEDG has been very limited due to the requirement for the machine tool and process design to ensure workpiece surface integrity. HEDG is an aggressive machining process that requires an adequate selection of grinding parameters in order to be successful within a given machine tool and workpiece configuration. This paper presents progress made in the development of a specialised HEDG machine. Results of HEDG processes obtained from the designed machine tool are presented to illustrate achievable high specific removal rates. Specific grinding energies are shown alongside with measured contact arc temperatures. An enhanced single-pole thermocouple technique was used to measure the actual contact temperatures in deep cutting. The performance of conventional wheels is depicted together with the performance of a CBN wheel obtained from actual industrial tests.

scholarly journals Use of an Inverse Method for the Design of High Efficiency Compressor and Turbine Blades With Large Change in Radius

1984 ◽  
Author(s):  
G. Meauzé ◽  
A. Lesain
Keyword(s):  
Inverse Method ◽  
High Efficiency ◽  
Radial Flow ◽  
Turbine Blades ◽  
Large Change ◽  
Airfoil Optimization ◽  
Time Marching ◽  
Flow Compressor ◽  
Compressor And Turbine Blades ◽  
Made In

Extension of the time-marching computations of flows in 2-D blade cascades to the case of cascades with variable radius and stream tube thickness. One of the specific cases analyzed is that of purely radial cascades. Direct and inverse calculations are made, in non-viscous subsonic or supersonic flows, with or without shock waves. Examples of the design of high efficiency airfoil optimization for radial flow compressor rotors or Stators or inward flow turbine inlet guide vanes are presented.

The Third Wave: Islamization of Europe, or Europanization of Islam?

2013 ◽  
Vol 2 (2) ◽  
pp. 115-136
Author(s):  
Maurits S. Berger
Keyword(s):  
Human Rights ◽  
Religious Discourse ◽  
Religious Values ◽  
The Political ◽  
Third Wave ◽  
The Real ◽  
Four Dimensions ◽  
The Third ◽  
European Values ◽  
Made In

Abstract To understand the concerns and issues related to Muslims and Islam in Europe, this article makes use of a framework that qualifies ‘Islam’ as two manifestations of ‘physical’ and ‘virtual’ Islam and ‘Europe’ as two discourses defined as the political-legal and cultural-religious discourse. The resulting matrix of these four dimensions will be applied to several of the main issues of the interaction between Islam and Europe: the numerical presence of Muslims, their visibility, the legacy of centuries of European-Islamic interaction, and the (in)compatibility of Islamic and European values. Based on these examples, the author observes that the European concerns regarding ‘Islam’ mostly relate to virtual Islam and are dominated by cultural-religious discourse. The author therefore questions the often-heard two-choice question between ‘Europanization of Islam’ or ‘Islamization of Europe’, arguing that the real choice to be made in Europe is whether it will adhere to its political-legal values, such as liberalism, equalit and human rights, or will prefer its cultural-religious values.

Product and Factory Modeling for Production Rate Determination

1999 ◽  
Author(s):  
S. G. Karthik ◽  
Edward B. Magrab
Keyword(s):  
Production Rate ◽  
Lead Time ◽  
Design Stage ◽  
Manufacturing Processes ◽  
Assembly Structure ◽  
Secondary Manufacturing ◽  
Relationship Of ◽  
The Relationship ◽  
Selection Of ◽  
Made In

Abstract An intelligent graphical user interface that captures a product’s functional and assembly structure and the factory that will make it are described. The results are then used to evaluate a factory’s production rate for the product. The program requires the product to be either a functionally uncoupled or decoupled design. The interface then: (1) implements a visualization of the functionally decomposed product structure; (2) implements an abstraction of a factory; (3) automatically generates candidate primary manufacturing processes and materials that are compatible with each other based on a very small number of attributes; (4) enables the user to make Make/Buy decisions for the components comprising the product; (5) assists the user in the selection of secondary manufacturing processes that are compatible with the primary manufacturing processes and materials for parts made in-house, and specify the vendor and the supply lead time for outsourced parts; (6) enables the specification of alternate materials and manufacturing processes; (7) implements a visual representation of the assembly structure as specified by the user; and (8) partially automates the creation of the assembly structure, and assists in the selection of assembly methods that are compatible with the materials chosen. In addition, the program assists in the design for assembly by: (1) requiring the product development team to think about the assembly process early in the design stage; (2) providing a visualization of the relationship of all components comprising the product to its other components; (3) requiring the specification of the order in which they are to be assembled; and (4) requiring the selection of assembly processes that are compatible with each other and the materials chosen. It also requires the specification of the capabilities of the factory that is going to make one or more of the components of the product, and requires that Make/Buy decisions for the parts comprising the product be made.

Size Effects in Cutting With a Diamond-Coated Tool

2011 ◽  
Author(s):  
Feng Qin ◽  
Xibing Gong ◽  
Kevin Chou
Keyword(s):  
Residual Stresses ◽  
Size Effect ◽  
Normal Stress ◽  
High Speed ◽  
Chip Thickness ◽  
Tool Geometry ◽  
Uncut Chip Thickness ◽  
Edge Radius ◽  
Coated Tool ◽  
Tool Stresses

In machining using a diamond-coated tool, the tool geometry and process parameters have compound effects on the thermal and mechanical states in the tools. For example, decreasing the edge radius tends to increase deposition-induced residual stresses at the tool edge interface. Moreover, changing the uncut chip thickness to a small-value range, comparable or smaller than the edge radius, will involve the so-called size effect. In this study, a developed 2D cutting simulation that incorporates deposition residual stresses was applied to evaluate the size effect, at different cutting speeds, on the tool stresses, tool temperatures, specific cutting energy as well as the interface stresses around a cutting edge. The size effect on the radial normal stress is more noticeable at a low speed. In particular, a large uncut chip thickness has a substantially lower stress. On the other hand, the size effect on the circumferential normal stress is more noticeable at a high speed. At a small uncut chip thickness, the stress is largely compressive.

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