scholarly journals Impact of smoothing conditions on the rounding effect of cutting edges of cemented carbide machining blades

Mechanik ◽  
2018 ◽  
Vol 91 (10) ◽  
pp. 868-870
Author(s):  
Szymon Baczyński ◽  
Piotr Cichosz ◽  
Mikolaj Kuzinovski ◽  
Mite Tomov ◽  
Adam Urych
Keyword(s):  
Cutting Edge ◽  
Cemented Carbide ◽  
Cemented Carbides ◽  
The Impact

The origin of rounding cutting edges of machining blades made out of cemented carbides is presented. Various methods of cutting edge smoothing and rounding measurement are described. The impact of smoothing conditions on the intensity and effects of edge rounding is specified.

scholarly journals On a Magical Mystery Tour of Green Insecticide Research: Current Issues and Challenges

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 5014
Author(s):  
Giovanni Benelli
Keyword(s):  
Cutting Edge ◽  
Plant Origin ◽  
Behavioral Traits ◽  
Modes Of Action ◽  
Natural Substances ◽  
The Impact ◽  
Lethal Doses ◽  
Selection Of

The Editorial outlines recent research advances in green insecticide research. Particular attention is devoted to studies shedding light on the modes of action and non-target toxicity of natural substances of plant origin. Research focusing on the development of new formulations (including those relating to nano-objects) to magnify the effectiveness and stability of green insecticides in the field represents key advances. Herein, a carefully reviewed selection of cutting edge articles about green pesticide development recently published in Molecules is presented. The impact of sub-lethal doses of green insecticides on insect behavioral traits is still overlooked, representing a timely challenge for further research.

Experimental Assessment of Roughness Changes in the Cutting Surface and Microhardness Changes of the Material S 355 J2 G3 after Being Cut by Non-Conventional Technologies

2011 ◽  
Vol 314-316 ◽  
pp. 1944-1947 ◽  
Author(s):  
Jozef Maščeník ◽  
Stefan Gaspar
Keyword(s):  
Mechanical Properties ◽  
Production Process ◽  
Laser Plasma ◽  
Manufacturing Process ◽  
Production Quality ◽  
Water Jet ◽  
Cutting Edge ◽  
Experimental Assessment ◽  
Cutting Surface ◽  
The Impact

Production of components, necessary for the construction of the machine resp. or device is a demanding manufacturing process. One of the possibilities of increasing efficiency and production quality is the introduction of unconventional technologies to the production process. Knowing the dependence of the impact of non-conventional technologies on the mechanical properties of products and their subsequent verification is an important aspect when designing and manufacturing them. The article deals with the impact of used unconventional technology, that means laser, plasma and water jet on the roughness of a cutting edge and microhardness of material S 355 J2 G3.

What Sound Can Be Expected From a Worn Tool?

1969 ◽  
Vol 91 (3) ◽  
pp. 525-534 ◽  
Author(s):  
E. J. Weller ◽  
H. M. Schrier ◽  
Bjorn Weichbrodt
Keyword(s):  
Machine Tool ◽  
Detection System ◽  
Cutting Edge ◽  
Cemented Carbide ◽  
Electronic Unit ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
Edge Wear ◽  
Sonic Detection ◽  
1045 Steel

This paper describes an electronic-mechanical system which utilizes sonic signals to detect the degree of cutting edge wear in metalworking tools and automatically trigger a cutting edge change. A packaged electronic unit reads out sonic vibrations from an instrumented machine-tool workpiece cutting-tool system to determine degree of cutting edge wear during a turning cut. At a predetermined comparative sonic ratio, the electronic unit commands stoppage of the machine tool feed, retraction of the tool and automatic index of the cemented carbide insert to the next good cutting edge. The latter function is performed by a prototype mechanical device. The paper describes the system and cites data generated during use of the sonic detection system with five grades of cemented carbide cutting AISI 1045 steel. Results under varying cutting conditions are reported. The authors speculate on the possibility of combining such a wear detection and cutting edge indexing arrangement with a computer to provide a complete system for optimum productivity and economy in a completely automatic operation.

scholarly journals Effect of Heat Treatment on the Microstructure and Properties of Ultrafine WC–Co Cemented Carbide

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1302
Author(s):  
Zhongnan Xiang ◽  
Zhanjiang Li ◽  
Fa Chang ◽  
Pinqiang Dai
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Service Life ◽  
Treatment Process ◽  
Cutting Conditions ◽  
Cemented Carbide ◽  
Cemented Carbides ◽  
Heat Treatment Process ◽  
Microstructure And Properties ◽  
Ultrafine Grained

In this paper, the effect of heat treatment on the microstructure and properties of a 0.8 μm WC–10%Co ultrafine cemented carbide was studied. The results show that the microstructural differences in ultrafine WC–Co cemented carbides without and with heat treatment are mainly reflected in the Co phase. For conventional cemented carbides, the hardness and wear resistance can be increased only at the expense of the toughness and strength. An ultrafine-grained WC–Co cemented carbide with good hardness and toughness can be obtained by strengthening the Co phase through an appropriate heat treatment process, and the service life of the ultrafine-grained WC–Co cemented carbide can be improved under actual cutting conditions.

By the seat of your pants

2019 ◽  
Vol 33 (4) ◽  
pp. 33-35
Keyword(s):  
Heart Rate ◽  
Experiential Learning ◽  
Case Studies ◽  
Design Methodology ◽  
Reading Time ◽  
Cutting Edge ◽  
Content Type ◽  
Pertinent Information ◽  
The Impact ◽  
Practical Implications

Purpose This paper aims to review the latest management developments across the globe and pinpoints practical implications from cutting-edge research and case studies. Design/methodology/approach This briefing is prepared by an independent writer who adds his/her own impartial comments and places the articles in context. Findings The aim of the research here was to investigate the impact experiential learning can have on an organization, and what kind of factor the stress of leadership can be. It was found that increased heart rate and engagement can improve learning in stressful situations. Originality/value The briefing saves busy executives and researchers hours of reading time by selecting only the very best, most pertinent information and presenting it in a condensed and easy-to-digest format.

High Energy Milling of WС-FeСr Cemented Carbide

2019 ◽  
Vol 799 ◽  
pp. 136-141
Author(s):  
Marek Tarraste ◽  
Jakob Kübarsepp ◽  
Kristjan Juhani ◽  
Märt Kolnes ◽  
Mart Viljus
Keyword(s):  
Particle Size ◽  
Ball Mill ◽  
Size Range ◽  
High Energy ◽  
Cemented Carbide ◽  
Cemented Carbides ◽  
Binder Phase ◽  
Metal Powders ◽  
Powder Mixtures ◽  
High Energy Milling

During production of cemented carbides hard and brittle tungsten carbide (WC) and ductile metal powders (mainly from Fe-group) are milled together. Complete milling results in a Gaussian distribution and narrow particle size range of the milled powder which promote the homogeneity and improve the properties of sintered composites. Cobalt, conventional metal employed in cemented carbides, possesses good comminution characteristics with WC powder. However, its toxicity and fluctuating price pushes researchers to find suitable alternatives and Fe-based alloys have shown most promising results. Cemented carbides with the Fe-Cr system as metal binder phase have potential to perform better than regular WC-Co composites in corrosive and oxidative environments. The goal of this paper was to prepare uniform cemented carbides powders with relatively high fraction of stainless Fe-Cr steel. To achieve a uniform powder mixture is a challenge at high ductile steel fraction. High energy milling (HEM) is a powerful technique for achieving (ultra) fine powder mixtures with narrow powder size range. HEM was carried out in a novel high energy ball mill RETSCH Emax. Milling in tumbling ball mill, which is the most widely used method, was employed for reference. Prepared powder mixtures were characterised in terms of particle size, size distribution and shape. In addition, powder mixtures were consolidated via spark plasma sintering to evaluate the effect of the milling method and the duration on the microstructure of final cemented carbide.

Selective Electrolytic Corrosion Behaviours of WC in WC-Co Cemented Carbide

2017 ◽  
Vol 898 ◽  
pp. 1478-1484 ◽  
Author(s):  
Zhong Wu Li ◽  
Cheng Guang Lin ◽  
Xing Cheng Xie ◽  
Rui Jun Cao ◽  
Zhong Kun Lin
Keyword(s):  
Grain Size ◽  
Corrosion Rate ◽  
Cemented Carbide ◽  
Cemented Carbides ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrolytic Corrosion ◽  
Mean Grain Size ◽  
Diffraction Peaks ◽  
Corrosion Time

In this work, WC grains in WC-Co cemented carbide were selectively electrolytic corroded and the effects of corrosion time, WC mean grain size and Co content on corrosion rate were systematically investigated. The results showed that corrosion rate decreased with the prolonging of electrolytic corrosion time. The WC-9Co cemented carbides had grain size of 2.9 μm The intensity of Co diffraction peaks was found to exceed the WC diffraction peaks when corroded for 4 hours, and the WC diffraction peaks disappeared when corroded for 8 hours. The corrosion rate increased with the decrease of WC mean grain size and the Co content. As the WC content increased in cemented carbide, it was necessary to increase corrosion time when analyzed Co phase in the cemented carbide by X-ray diffraction.

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