scholarly journals USAGE OF DIGITAL MODELS IN THE DESIGN AND MANUFACTURE OF COMPLEX-PROFILE CUTTING INSERTS MADE OF BLANKS WITH FLAT FACES

2021 ◽  
Vol 51 (1) ◽  
pp. 52-54
Author(s):  
Stanislav V. Mikhailov ◽  
Maxim A. Pomerantsev ◽  
Oleg V. Zimnitsky ◽  
Sergey A. Golubev
Keyword(s):  
Cutting Tools ◽  
Practical Experience ◽  
High Tech ◽  
Complex Profile ◽  
Digital Models ◽  
Topical Problem ◽  
Cutting Inserts ◽  
New Material ◽  
Digital Modelling ◽  
Design And Manufacture

The article deals with the topic of cutting tools, which refers to high-tech, constantly improving products. Particular attention in the article is paid to modern trends in the development of cutting tools, including the design of new and improvement of existing designs of tools and technologies for its manufacture. The article is devoted to the topical problem of digital modelling of the cutting inserts that ensures favourable cutting conditions and stable shavings breakage during cutting. The article summarises new material on the practical experience of using digital models in the design of complex-profile inserts. The authors focus on the application of computer simulation of the sharpening operation. This allows to quickly change the geometry of the prototypes by changing the settings of the sharpening machine.

scholarly journals Feasibility of Cobalt-Free Nanostructured WC Cutting Inserts for Machining of a TiC/Fe Composite

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3432
Author(s):  
Edwin Gevorkyan ◽  
Mirosław Rucki ◽  
Tadeusz Sałaciński ◽  
Zbigniew Siemiątkowski ◽  
Volodymyr Nerubatskyi ◽  
...  
Keyword(s):  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Machined Surface ◽  
Powder Consolidation ◽  
Plasma Sintering ◽  
Cutting Inserts ◽  
Spark Plasma ◽  
And Performance ◽  
Nanostructured Tungsten Carbide

The paper presents results of investigations on the binderless nanostructured tungsten carbide (WC) cutting tools fabrication and performance. The scientific novelty includes the description of some regularities of the powder consolidation under electric current and the subsequent possibility to utilize them for practical use in the fabrication of cutting tools. The sintering process of WC nanopowder was performed with the electroconsolidation method, which is a modification of spark plasma sintering (SPS). Its advantages include low temperatures and short sintering time which allows retaining nanosize grains of ca. 70 nm, close to the original particle size of the starting powder. In respect to the application of the cutting tools, pure WC nanostructure resulted in a smaller cutting edge radius providing a higher quality of TiC/Fe machined surface. In the range of cutting speeds, vc = 15–40 m/min the durability of the inserts was 75% of that achieved by cubic boron nitride ones, and more than two times better than that of WC-Co cutting tools. In additional tests of machining 13CrMo4 material at an elevated cutting speed of vc = 100 m/min, binderless nWC inserts worked almost three times longer than WC-Co composites.

scholarly journals Teaching digital models: secondary technology teachers’ experiences

2021 ◽  
Author(s):  
Helen Brink ◽  
Nina Kilbrink ◽  
Niklas Gericke
Keyword(s):  
Problem Solving ◽  
Empirical Data ◽  
Digital Tools ◽  
Digital Models ◽  
Structured Interviews ◽  
Digital Competence ◽  
Technology Teachers ◽  
Teachers Experiences ◽  
Digital Modelling ◽  
Single Idea

AbstractIn secondary technology education, models of artifacts, systems and processes, visualized and simulated through digital tools (digital models) are a relatively new element. Technology teachers teach digital models to meet syllabus criteria of digital competence, applicable to for instance problem solving and documentation using digital tools. However, there is a lack of knowledge concerning how teachers use digital models in their teaching, what their intentions are, and what content they choose. It is known, though, that teachers’ experiences influence the teaching. Therefore, the aim of this study is to investigate teachers’ experiences of teaching digital models in compulsory school, to contribute to more knowledge of teaching in this area. This study takes a phenomenological lifeworld approach, and 12 semi-structured interviews with lower secondary technology teachers form the empirical data. The data were analyzed thematically and the results are four themes of experiencing the teaching of digital models, indicating that technology teachers teach with different aims and purposes; Enhancing and integrating other subjects, Visualizing technology to the pupils, Enabling digital modelling, and Preparing pupils for the future. Further, the results also indicate that the content and methods of teaching differ and that teachers did not experience digital models as one single idea but as an amalgam of multiple ideas. These findings can be used as a basis for further research and development of teaching concerning digital models.

scholarly journals The Role of Thin-Film Vacuum-Plasma Coatings and Their Influence on the Efficiency of Ceramic Cutting Inserts

Coatings ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 287 ◽  
Author(s):  
Marina Volosova ◽  
Sergey Grigoriev ◽  
Alexander Metel ◽  
Alexander Shein
Keyword(s):  
Bending Strength ◽  
Surface Defects ◽  
Cutting Tools ◽  
High Energy ◽  
Radius Of Curvature ◽  
Sic Ceramic ◽  
Operational Tests ◽  
Mechanical Fastening ◽  
Cutting Inserts ◽  
The Impact

The main problem with ceramics used in cutting tools is related to the unpredictable failures caused by the brittle fracturing of ceramic inserts, which is critical for the intermittent milling of cyclic loading. A 125-mm-diameter eight-toothed end mill, with a mechanical fastening of ceramic inserts, was used as a cutting tool for milling hardened steel (102Cr6). For the experiments, square inserts of the Al2O3 + SiC ceramic were used and compared with the samples made of Al2O3 + TiC to confirm the obtained results. The samples were coated with diamond-like coating (DLC), TiZrN, and TiCrAlN coatings, and their bending strength and adhesion were investigated. Investigations into the friction coefficient of the samples and operational tests were also carried out. The effect of smoothing the microroughness and surface defects in comparison with uncoated inserts, which are characteristic of the abrasive processing of ceramics, was investigated and analyzed. The process developed by the authors of the coating process allows for the cleaning and activation of the surface of ceramic inserts using high-energy gas atoms. The impact of these particles on the cutting edge of the insert ensures its sharpening and reduces the radius of curvature of its cutting edges.

scholarly journals Machining of Iron-Carbon Alloys by the Use of Poly-Crystalline Diamond Cutting Inserts with Internal Cooling

2018 ◽  
Vol 2 (3) ◽  
pp. 57 ◽  
Author(s):  
Manuel Reiter ◽  
Jens Brier ◽  
Friedrich Bleicher
Keyword(s):  
Wear Behavior ◽  
Cutting Tools ◽  
Tool Material ◽  
Internal Cooling ◽  
Diamond Cutting ◽  
Diffusion Effects ◽  
Cutting Inserts ◽  
Abrasive Cutting ◽  
Poly Crystalline Diamond ◽  
Insight Into

Poly-crystalline diamond (PCD) is an extremely tough, synthetically produced cutting tool material, which offers outstanding capabilities concerning wear behavior in abrasive cutting environments. Currently, the primary application of PCD cutting tools is the machining of non-ferrous materials, as the diamond’s carbon high affinity towards iron causes diffusion effects while cutting steel with rising temperature. This effect significantly reduces tool life. To lower the occurring temperature of the cutting process, and therefore avoid the reaction of carbon and iron, a thermal functionalization of the cutting inserts has been investigated. The results give insight into making PCD cutting tools economically usable for the machining of iron-carbon materials.

The Principles of Simple Technologies

2020 ◽  
pp. 49-80
Author(s):  
Philippe Bihouix
Keyword(s):  
Technical Efficiency ◽  
Standard Of Living ◽  
Successful Outcome ◽  
High Tech ◽  
Plastic Bags ◽  
Single Use ◽  
To Come ◽  
Design And Manufacture ◽  
Rate Of Consumption

This chapter explores the principles of a low-tech approach that are developed and rooted in the search for simplicity and conviviality, localization, design, and manufacture for true sustainability. It describes paths to be taken and general principles on low-tech based on the conscious rejection of the hope of a successful outcome based on technological breakthroughs still to come. It also elaborates the principle of simplicity as the immense advantage of the pure and simple suppression of need that aims to effectively reduce the rate of consumption of resources. The chapter mentions examples of ways to reduce the non-negotiable standard of living, such as a ban on advertising materials, trainers that flash when walking, or single-use plastic bags. It analyses the main problem of the high-tech world under the pretext of seeking greater effectiveness and technical efficiency.

Research on 3C Integrated System of CBN Turning Tool for Small and Medium-Sized Enterprises

2010 ◽  
Vol 42 ◽  
pp. 91-94
Author(s):  
Nan Bo Liu ◽  
Zhao Yun Wu ◽  
Gang Yan Li ◽  
Shu Long Hu ◽  
Cheng Lin Yang
Keyword(s):  
System Integration ◽  
Cutting Tools ◽  
Object Oriented ◽  
Integrated System ◽  
Application Layer ◽  
Class Model ◽  
Information System Integration ◽  
Data Layer ◽  
Design And Manufacture ◽  
Hard Cutting

In view of the problems and difficulties in the information system integration of the small and medium-sized super-hard cutting tools enterprises, the characteristics of the design and manufacture of the CBN turning tool were analyzed. The demand of the enterprises for the 3C integrated system of CBN turning tool was presented. The 3-layer architecture of the 3C integrated system of CBN turning tool was proposed, which included the data layer, the application layer and the user layer. The object-oriented method was adopted to design the system and the class model of the system was constructed. Based on these, the 3C integrated system of CBN turning tool for small and medium-sized enterprises was developed. The key technologies of the system were put forward. The system had been applied to the enterprise and run well.

scholarly journals Selection Of Cutting Inserts For Aluminum Alloys Machining By Using MCDM Method

2015 ◽  
Vol 66 (1) ◽  
pp. 98-101 ◽  
Author(s):  
Miloš Madić ◽  
Miroslav Radovanović ◽  
Dušan Petković ◽  
Bogdan Nedić
Keyword(s):  
Decision Making ◽  
Aluminum Alloys ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Multi Criteria Decision Making ◽  
Complex Task ◽  
Cutting Inserts ◽  
Mcdm Method ◽  
Product Assessment ◽  
Selection Of

Abstract Machining of aluminum and its alloys requires the use of cutting tools with special geometry and material. Since there exists a number of cutting tools for aluminum machining, each with unique characteristics, selection of the most appropriate cutting tool for a given application is very complex task which can be viewed as a multi-criteria decision making (MCDM) problem. This paper is focused on multi-criteria analysis of VCGT cutting inserts for aluminum alloys turning by applying recently developed MCDM method, i.e. weighted aggregated sum product assessment (WASPAS) method. The MCDM model was defined using the available catalogue data from cutting tool manufacturers.

scholarly journals A paradigm shift in the concept of arrhythmogenic cardiomyopathy: expanding the clinical and genetic spectrum, new diagnostic criteria for left ventricular phenotypes

2020 ◽  
Vol 25 (10) ◽  
pp. 3863
Author(s):  
T. G. Vaikhanskaya ◽  
L. N. Sivitskaya ◽  
T. V. Kurushko ◽  
T. V. Rusak ◽  
O. D. Levdansky ◽  
...  
Keyword(s):  
Genetic Diseases ◽  
Diagnostic Algorithm ◽  
Heart Rhythm ◽  
Practical Experience ◽  
Left Ventricular ◽  
High Tech ◽  
Arrhythmogenic Cardiomyopathy ◽  
Multicenter Studies ◽  
Plakophilin 2 ◽  
The Right

Recent multicenter studies using high-tech cardiac imaging and novel translational technologies have shown that cardiac fibrofatty replacement, characteristic of arrhythmogenic cardiomyopathy (ACM), is observed in both ventricles; left ventricular (LV) involvement may be minimal, on par with the right ventricle (RV), or dominant. In 2019, the Heart Rhythm Society (HRS) proposed a new approach to the assessment of arrhythmic and genetic diseases with the inclusion of new phenotypes — left-dominant ACM and biventricular ACM. In 2020, to improve the diagnosis of left ventricular phenotypes, European experts revised ACM criteria (based on the 2010 ITF criteria), which are called the Padua criteria.The presented article highlights the clinical and genetic aspects of the new concept and the difficulties in ACM diagnosis, the practical experience of using new diagnostic algorithm. To help practitioners, step-by-step differential diagnosis and risk stratification of right and left ventricular phenotypes are presented using clinical examples (leftdominant ACM with a pathogenic variant in the LMNA gene; right-dominant ACM associated with a desmoplakin gene mutation, with predominant RV and moderate LV involvement; and an isolated RV ACM associated with a mutation in the plakophilin 2 gene).

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