scholarly journals Modeling of Non-Stationary Processes When Cutting Hard-to-Process Materials

2021 ◽  
Vol 248 ◽  
pp. 04018
Author(s):  
Sergey Grigoriev ◽  
Mars Migranov ◽  
Abdumalik Seitkulov
Keyword(s):  
Wear Resistance ◽  
High Speed ◽  
Metal Cutting ◽  
Production Efficiency ◽  
Cutting Tool ◽  
Experimental Studies ◽  
Increase Production Efficiency ◽  
Longitudinal Length ◽  
Blade Cutting ◽  
Cutting Modes

In the conditions of high-speed processing of parts of complex configuration, with a large end and longitudinal length, from hard-to-work steels and alloys, it is difficult to ensure the wear resistance of the cutting tool in the aisles of one technological passage. To ensure the appropriate quality indicators of the surface layer, it is impossible to replace a worn-out cutting tool. In connection with the above, the problem of ensuring the operability (wear resistance) of the cutting tool is acute. The results of theoretical and experimental studies of contact phenomena in blade cutting based on the thermodynamics of non – equilibrium processes and from the standpoint of self-organization of the tribosystem are presented. the developed thermodynamic model of blade processing with variable cutting modes (non-stationary) allows to minimize the wear of the cutting tool and generally increase production efficiency by accelerating the drive of the main movement of the metal-cutting machine.

VASCODYNE

Alloy Digest ◽  
1984 ◽  
Vol 33 (11) ◽  
Keyword(s):  
Wear Resistance ◽  
High Speed ◽  
Metal Cutting ◽  
Lower Cost ◽  
Cutting Tool ◽  
High Speed Steel ◽  
Heat Treating ◽  
Hot Hardness

Abstract VascoDyne is a high-speed steel for the metal-cutting industry. This steel is designed to give equivalent or better performance than many grades of high-speed steel now in use and at a lower cost. VascoDyne provides improved hot hardness and wear resistance over conventional high-speed steels such as AISI Types, M1, M7 and M10. VascoDyne is recommended as an excellent alternate to the traditional high-speed steels used in cutting-tool applications. This datasheet provides information on composition and hardness. It also includes information on forming, heat treating, and machining. Filing Code: TS-431. Producer or source: Teledyne Vasco.

The use of assembled cutting tool with damping elements to reduce mechanical vibrations

2021 ◽  
Author(s):  
Keyword(s):  
High Speed ◽  
Metal Cutting ◽  
Cutting Tool ◽  
End Mill ◽  
Mechanical Vibrations ◽  
Machined Surface ◽  
High Speed Cutting ◽  
End Mills ◽  
Cutting Modes

Aspects of vibration reduction during machining on metal-cutting machines to improve the quality of machined surfaces at moderate and high-speed cutting modes are considered. End mills with damping elements made of different materials, which provide the control of tool rigidity, are developed. Keywords: vibrations, end mill, vibrations, machined surface, damping. [email protected]

Laser Modification of Metal Cutting Tool: Assessment of the Influence on Wear Resistance and Quality of the Processed Surface

2020 ◽  
Vol 836 ◽  
pp. 118-123
Author(s):  
S.K. Kargapol’tsev ◽  
V.I. Shastin ◽  
V.E. Gozbenko
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Experimental Studies ◽  
Machined Surface ◽  
Laser Modification ◽  
Metal Cutting Tool ◽  
The Impact

The paper reflects the relevance of hardening the working surfaces of the tool, where the surface layer plays a fundamental role. The main factors determining the wear resistance of the tool and their influence on the quality of the processed surface are analyzed. The purpose of the research is to study the effect of laser modification of tool alloys on wear resistance and on the roughness parameters of the machined surface. A small-sized drill bit (steel P6M5) and carbide inserts T15K6 are used as objects of research. The paper presents the results of experimental studies on the impact of laser radiation on the microstructure of materials, indices of wear resistance and quality parameters of the treated surface. It is established that there is a certain relationship between these indices. The modes of laser modification of the tool most acceptable for practical use are determined. Along with an increase in the wear resistance of a metal-cutting tool, a manifestation of the effect of an increase in surface roughness indices is found and experimentally confirmed. It is established that hardening of the surface layer is caused by structural and phase transformations with enhanced physical and mechanical properties, and the roughness indices depend on the degree of dispersion (amorphization) of the modified layer.

A Promising Method for Improving Wear Resistance of Metal Cutting Tools

2015 ◽  
Vol 788 ◽  
pp. 325-329
Author(s):  
Alexander G. Ovcharenko ◽  
Andrey Yu. Kozlyuk ◽  
Mikhail O. Kurepin
Keyword(s):  
Wear Resistance ◽  
High Speed ◽  
Metal Cutting ◽  
Cutting Tools ◽  
Experimental Studies ◽  
Practical Interest ◽  
High Speed Steel ◽  
Promising Method ◽  
Steel R6m5 ◽  
Machine Parts

Abstract. A promising method for improving wear resistance of metal cutting tools including pre-heating and a subsequent impact of the pulsed magnetic field of high intensity on the cutting tool is proposed. The experimental setup and methods of research are described. Experimental studies of surfaces of carbide reversible cutting plates of the VK8, T15K6 alloy and drills of high speed steel R6M5 to assess the effectiveness of the proposed method were performed. An increase in wear resistance of cutting tools made of the T15K6 hard-alloy plates by 30% and made of the VK8 alloy plates by 13% was revealed while wear resistance of drills made of steel R6M5 increased on average by 58% The proposed method can be of practical interest for hardening the surface of other types of tools and machine parts for further experimental verification.

High-Speed Machining of Ti-6Al-4V With a Micro Textured Cutting Tool Focusing on Coolant Behaviors

2020 ◽  
Author(s):  
Mitsuru Hasegawa ◽  
Tatsuya Sugihara
Keyword(s):  
High Speed ◽  
Metal Cutting ◽  
Production Efficiency ◽  
Cutting Tool ◽  
Failure Process ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Cutting Fluid ◽  
High Speed Machining ◽  
Textured Surfaces

Abstract In the cutting of Ti-6Al-4V alloy, the cutting speed is limited as a high cutting temperature leads to severe tool wear and short tool life, resulting in poor production efficiency. However, some recent literature has reported that various beneficial effects can be provided by forming micro-textures on the tool surface in the metal cutting process. In this study, in order to achieve high-performance machining of Ti-6Al-4V, we first investigated the mechanism of the tool failure process for a cemented carbide cutting tool in high-speed turning of Ti-6Al-4V. Based on the results, cutting tools with micro textured surfaces were developed under the consideration of a cutting fluid action. A series of experiments showed that the textured rake face significantly suppresses both crater wear and flank wear. In addition, optimum texture structures and the mechanism of the texture effects in high-speed machining of Ti-6Al-4V alloy were discussed.

Hard Nano-Crystalline Coatings for Cutting Tools

2007 ◽  
Vol 567-568 ◽  
pp. 185-188 ◽  
Author(s):  
Miroslav Piska
Keyword(s):  
High Speed ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Dry Cutting ◽  
Nano Crystalline ◽  
The Right ◽  
Machining Productivity ◽  
Hard Cutting ◽  
Cutting Tool Materials

Modern trends in metal cutting, high speed/feed machining, dry cutting and hard cutting set more demanding characteristics for cutting tool materials. The exposed parts of the cutting edges must be protected against the severe loading conditions and wear. The most significant coatings methods for cutting tools are PVD and CVD/MTCVD today. The choice of the right substrate or the right protective coating in the specific machining operation can have serious impact on machining productivity and economy. In many cases the deposition of the cutting tool with a hard coating increases considerably its cutting performance and tool life. The coating protects the tool against abrasion, adhesion, diffusion, formation of comb cracks and other wear phenomena.

Influence of thermal cycling modes on VK8 hard alloy mechanical and tribological properties

2020 ◽  
pp. 55-65
Author(s):  
S. I. Bogodukhov ◽  
E. S. Kozik ◽  
E. V. Svidenko
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Wear Resistance ◽  
Thermal Cycling ◽  
Hard Alloy ◽  
Tribological Properties ◽  
High Speed ◽  
Metal Cutting ◽  
Hard Alloys ◽  
Mechanical And Tribological Properties

Hard alloys are popular materials widely used in the toolmaking industry. Refractory carbides included in their composition make carbide tools very hard (80 to 92 HRA) and heat-resistant (800 to 1000 °С) so as they can be used at cutting speeds several times higher than those used for high-speed steels. However, hard alloys differ from the latter by lower strength (1000 to 1500 MPa) and the absence of impact strength, and this constitutes an urgent problem. We studied the influence of thermal cycling modes on the mechanical and tribological properties of VK8 (WC–8Co) hard alloy used in the manufacture of cutters and cutting inserts for metal working on metal-cutting machines. As the object of study, we selected 5×5×35 mm billets made of VK8 (WC–8Co) alloy manufactured by powder metallurgy methods at Dimitrovgrad Tool Plant. The following criteria were selected for heat treatment mode evaluation: Vickers hardness, flexural strength, and mass wear resistance (as compared to the wear of asreceived samples that were not heat treated). Plates in the initial state and after heat treatment were subjected to abrasion tests. Wear results were evaluated by the change in the mass of plates. Regularities of the influence of various time and temperature conditions of heat treatment on the tribological properties of products made of VK group tungsten hard alloys were determined. An increase in the number of thermal cycling cycles improved such mechanical properties of the VK8 hard alloy as strength and hardness. When repeating the cycles five times, an increase in abrasive wear resistance was obtained compared to the initial nonheat-treated sample. The elemental composition of the VK8 hard alloy changed insignificantly after thermal cycling, only a slight increase in oxygen was observed on the surface of plates. The grain size after thermal cycling increased in comparison with the initial VK8 hard alloy. It was found that VK8 hard alloy thermocyclic treatment leads to a change in the phase composition. X-ray phase analysis showed the presence of a large amount of α-Co with an hcp-type lattice on the surface of a hard alloy and a solid solution of WC in α-Co. A change in the cobalt modification ratio causes a decrease in microstresses. An analysis of the carbide phase structure state showed that the size of crystallites and microstresses changed after thermal cycling. The lattice constant of the cobalt cubic solid solution decreased, which may indicate a decrease in the amount of tungsten carbide and carbon dissolved in it. Statistical processing of experimental results included the calculation of the average value of the mechanical property, its dispersion and standard deviation in the selected confidence interval.

scholarly journals Increased Wear Resistance of High-Speed Tools Due to Diffusion Discrete Oxidation

2021 ◽  
Vol 346 ◽  
pp. 02014
Author(s):  
Elena A. Chekalova ◽  
Andrey V. Zhuravlev
Keyword(s):  
Wear Resistance ◽  
Comparative Studies ◽  
Surface Hardening ◽  
High Speed ◽  
Cutting Tool ◽  
Plasma Technology ◽  
Polycrystalline Structure ◽  
Ion Plasma ◽  
Discrete Surface ◽  
Oxidation Technology

Comparative studies of the effect of discrete surface hardening by standard ion-plasma technology and discrete oxidation technology on wear resistance have been carried out. Metallographic studies have shown that discrete oxidation has a polycrystalline structure. It was found that the technology of discrete oxidation makes it possible to increase the hardness by 31% in relation to the uncoated material, and the wear resistance of the cutting tool with oxidation is 1.5-3 times higher than that of the tool hardened by the standard ion-plasma technology.

scholarly journals Study of the effect of positioning accuracy of system rigidity and part quality in waterjet cutting

2021 ◽  
Vol 266 ◽  
pp. 04003
Author(s):  
Sh. S. Nozirzoda ◽  
S. E. Bukhanchenko
Keyword(s):  
Control Systems ◽  
Cutting Tool ◽  
Experimental Studies ◽  
Positioning System ◽  
Waterjet Cutting ◽  
Part Quality ◽  
Improve Accuracy ◽  
Processing Zone ◽  
Cutting Modes

This paper discusses ensuring the specified accuracy and quality of processing parts of various shapes by scientifically validatedchoiceof the processing zone, cutting modes, and making adjustments to the control systems of the technological system for waterjet cutting. In the course of experimental studies, the stiffness of the positioning system for the installation of awaterjet cutting tool, the accuracyand quality of processing with waterjet cutting were determined. The influenceof the stiffness of the positioning system of the abra-sive waterjet cuttingtool on the accuracyand quality of the surface of the ob-tained products and the ways to improve accuracy were determined. Based on the results of the study, recommendations to improve the accuracy and quality of partsare given.

FAGERSTA M-2

Alloy Digest ◽  
1978 ◽  
Vol 27 (8) ◽  
Keyword(s):  
Wear Resistance ◽  
Physical Properties ◽  
Surface Treatment ◽  
High Speed ◽  
Cutting Tool ◽  
High Speed Steel ◽  
Heat Treating ◽  
General Purpose

Abstract FAGERSTA M-2 is a widely used molybdenum-base high-speed steel. It is suitable for all general-purpose cutting-tool applications and it has an excellent combination of toughness and wear resistance. Its many applications include boring tools, chisels, lathe tools and shear blades. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, and surface treatment. Filing Code: TS-337. Producer or source: Fagersta Steels Inc..

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