Ivan Iovkov
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View article: Initial Period of Chip Formation: Observations Towards Enhancing Machining Sustainability
Initial Period of Chip Formation: Observations Towards Enhancing Machining Sustainability Open
In machining, high mechanical and thermal loads are exerted on a small area of the tool where it interacts with the workpiece. Despite limited interaction space, extensive use of cutting fluids (CFs) is inefficiently used to improve the ma…
View article: A Numerical-Experimental Study on Orthogonal Cutting of AISI 1045 Steel and Ti6Al4V Alloy: SPH and FEM Modeling with Newly Identified Friction Coefficients
A Numerical-Experimental Study on Orthogonal Cutting of AISI 1045 Steel and Ti6Al4V Alloy: SPH and FEM Modeling with Newly Identified Friction Coefficients Open
Numerical simulation of metal cutting with rigorous experimental validation is a profitable approach that facilitates process optimization and better productivity. In this work, we apply the Smoothed Particle Hydrodynamics (SPH) and Finite…
View article: DISCONTINUOUS DRILLING OF INCONEL 718
DISCONTINUOUS DRILLING OF INCONEL 718 Open
Inconel 718 as one of the most common nickel-base alloys is mainly characterized by its high-temperature strength. Thus, in particular drilling is subject to high tool wear due to high thermomechanical loads on the cutting edges. To reduce…
View article: Influence of a Discontinuous Process Strategy on Microstructure and Microhardness in Drilling Inconel 718
Influence of a Discontinuous Process Strategy on Microstructure and Microhardness in Drilling Inconel 718 Open
Nickel-base alloys are proven materials in the fields of the aerospace and oil industry, which is due to their characteristic material properties of high temperature strength, high toughness and good oxidation resistance. These properties …
View article: Development of a concept for the use of low-temperature emulsion in drilling of Inconel 718
Development of a concept for the use of low-temperature emulsion in drilling of Inconel 718 Open
Due to their low thermal conductivity, nickel-based alloys can cause an increased thermal energy flow to the cutting tool during machining. This may result in intensive tool wear and a poor bore quality. In order to increase the process co…
View article: Enhanced Surface Quality of Internal Machined Contours
Enhanced Surface Quality of Internal Machined Contours Open
Based on integrated concepts in the aspects of product design, choice of materials and manufacturing technologies, companies in the mechanical engineering as well as oil and gas industries are striving to increase energy efficiency through…
View article: Adhesion of Inconel 718 on Uncoated Tungsten Carbide Inserts in Interrupted Orthogonal Machining under MQL
Adhesion of Inconel 718 on Uncoated Tungsten Carbide Inserts in Interrupted Orthogonal Machining under MQL Open
Nickel-base super-alloys such as Inconel 718 are used for demanding applications in the industry. Their superior corrosion resistance and mechanical properties, especially under high heat and pressure, make them very attractive for highly …
View article: A modified tool design for the drilling of high-performance aerospace materials
A modified tool design for the drilling of high-performance aerospace materials Open
High-performance Ni- and Ti-based materials are generally difficult to machine. Drilling in particular is highly demanding for the applied tools due to challenging thermal stress. This paper describes a novel modification for twist drills …
View article: Advanced Simulation-based Design of High Performance Machining Processes
Advanced Simulation-based Design of High Performance Machining Processes Open
The development of high performance machining processes is a key aspect to achieve higher productivity, efficiency and performance in modern production systems. In order to reduce the corresponding effort and costs, simulation systems are …
View article: Simulation of MQL Deep Hole Drilling for Predicting Thermally Induced Workpiece Deformations
Simulation of MQL Deep Hole Drilling for Predicting Thermally Induced Workpiece Deformations Open
The resulting thermomechanical load on the workpiece in deep hole drilling operations using minimum quantity lubrication (MQL) induces a strong in-process deflection of the machined component and can cause an insufficient accuracy of the p…