Modeling of Tribological Characteristics of Specimens with Wear-Resistant Coating Using Dummy Variables

In the process of machining, one of the main factors affecting machining tool wear is friction. A decrease in the coefficient of friction between the machining tool and a machined part is a key challenge for researchers. One of the methods to decrease the coefficient of friction and, consequently, to improve the endurance of the tool is the application of wear-resistant coatings. In the current study, modelling of triboprocesses using dummy variables is proposed. Since a peculiarity of modelling of manufacturing processes is a presence of a large number of quality parameters, the influence of all key parameters on the value of the coefficient of friction has been analysed. Also, an adequate model of the dependence of the conditions of the manufacturing process on the coefficient of friction has been developed. The results of the model are important not only for analysis of friction between contact surfaces itself, but also as supplementary and qualitative estimation of different manufacturing processes.

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Cemented carbide cutting tools coated with silicon nitride

Izvestiya Vuzov Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya (Universitiesʹ Proceedings Powder Metallurgy аnd Functional Coatings) ◽

10.17073/1997-308x-2018-4-104-109 ◽

2018 ◽

pp. 104-109

Author(s):

V. S. Panov

Keyword(s):

Silicon Nitride ◽

Cutting Tool ◽

Cutting Tools ◽

Cemented Carbide ◽

Wear Resistant ◽

Factors Affecting ◽

Wear Resistant Coatings ◽

Cemented Carbide Tool ◽

Tools Wear ◽

Coated Cemented Carbide

The paper describes the technology of producing a wear resistant silicon nitride coating on cemented carbide cutting tools and factors affecting its structure and thickness. A review of domestic and foreign authors’ works is given on the properties and applications of cemented carbides in cutting, drilling, die stamping tools, wear resistant materials, for chipless processing of wood, plastics. It is noted that one of the promising ways of cutting tool development is using indexable throwaway inserts (ITI) with wear resistant coatings. The choice of silicon nitride as a material for cemented carbide tool coating is justified. The data on silicon nitride deposition methods, investigation of cutting tool structures and properties are provided. Laboratory and factory tests of Si3N4-coated cemented carbide tools demonstrated coating applicability in improving the wear resistance and lifetime of cutting inserts.

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Investigation of various factors affecting the coefficient of friction of yarn by using Taguchi method

Industria Textila ◽

10.35530/it.070.03.1555 ◽

2019 ◽

Vol 70 (03) ◽

pp. 211-215

Author(s):

MOHSIN MUHAMMAD ◽

NAI-WEN LI ◽

SOHAIL ANJUM MUHAMMAD ◽

KASHIF MAJEED MUHAMMAD

Keyword(s):

Taguchi Method ◽

Coefficient Of Friction ◽

Linear Density ◽

Orthogonal Design ◽

Taguchi Approach ◽

Response Factors ◽

Factors Affecting ◽

Yarn Quality ◽

Yarn Twist ◽

The Coefficient Of Friction

This research aims to analyze certain effects of yarn characteristics such as: cotton type, yarn quality, yarn spinning technique, yarn twist and linear density and yarn finish on coefficient of friction of yarn by using Taguchi approach. For evaluation of levels and response factors, 72 experiments are performed by using L36 orthogonal design twice for Taguchi approach. The results show that yarns comprising of finer fibers, combed, waxed, Rotor spun, optimum twist and low linear density have lowest coefficient of friction of yarn, which ultimately improves subsequent textile processes and improve product qualities.

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Features of Contact Interaction of Anti-Friction-Wear-Resistant Polypropylene Composite Materials with Raw Cotton

RA Journal Of Applied Research ◽

10.47191/rajar/v7i11.09 ◽

2021 ◽

Vol 07 (11) ◽

Author(s):

Sayibjan Sadikovich Negmatov ◽

Keyword(s):

Composite Materials ◽

Contact Interaction ◽

Coefficient Of Friction ◽

Polymer Materials ◽

Composite Polymer ◽

Polypropylene Composite ◽

Wear Resistant ◽

The Coefficient Of Friction ◽

Electric Theory

Based on the concepts of the theory of interaction and research in the course of researching the process of studying the interaction of composite polymer materials using the method of modeling interaction - the mechano-electric theory of contact interaction. The proposed formula for determining the coefficient of friction of composite polymer materials using pulp (raw cotton).

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Correlating the Features of Topography to Friction by Sliding Experiments

Volume 3: Design; Tribology; Education ◽

10.1115/esda2008-59071 ◽

2008 ◽

Cited By ~ 1

Author(s):

Anirudhan Pottirayil ◽

Pradeep L. Menezes ◽

Satish V. Kailas

Keyword(s):

Sheet Metal ◽

Coefficient Of Friction ◽

Sheet Metal Forming ◽

Metal Forming ◽

Work Piece ◽

Manufacturing Processes ◽

Experimental Procedure ◽

The Coefficient Of Friction ◽

Soft Metal

Friction can influence the quality of the finished product to a large extent in certain manufacturing processes. Sheet metal forming is a particular case, where the friction between the hard-die and the relatively soft work-piece can be extremely important. Under such conditions, topography of the harder surface can influence the resistance to traction at the interface. This paper discusses about the correlation between certain features of the surface topography and coefficient of friction based on experiments involving sliding of a few soft metal pins against a harder material. A brief description of the experimental procedure and the analysis are presented. A hybrid parameter which encapsulates both the amplitude features as well as the relative packing of peaks is shown to correlate well with the coefficient of friction.

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Forces Exerted by Ice on Ships

Journal of Ship Research ◽

10.5957/jsr.1968.12.4.302 ◽

1968 ◽

Vol 12 (04) ◽

pp. 302-312

Author(s):

H. Estrada ◽

S. R. Ward

Keyword(s):

Sea Ice ◽

Coefficient Of Friction ◽

Arctic Sea Ice ◽

Literature Survey ◽

Factors Affecting ◽

Arctic Sea ◽

Hull Design ◽

The Coefficient Of Friction ◽

Ice Strength ◽

Ice Failure

The factors affecting the strength of arctic sea ice are identified. Values are selected for the key parameters that determine ice strength. The selected values are based on a literature survey. The forces resulting from interaction of ice and hull are described in terms of the slope of the hull at the waterline and the coefficient of friction. The mechanism for ice failure is described and the effect of this analysis on hull design is discussed.

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Variation of Coefficient of Friction and Friction Head Losses Along a Pipe with Multiple Outlets

Water ◽

10.3390/w12030844 ◽

2020 ◽

Vol 12 (3) ◽

pp. 844 ◽

Cited By ~ 1

Author(s):

Wissam H. Alawee ◽

Yousef A. Almolhem ◽

Badronnisa Yusuf ◽

Thamer A. Mohammad ◽

Hayder A. Dhahad

Keyword(s):

Experimental Data ◽

Coefficient Of Friction ◽

Field Studies ◽

Pipe Length ◽

G Factor ◽

Factors Affecting ◽

Head Losses ◽

Main Pipe ◽

Supply Tank ◽

The Coefficient Of Friction

The flow in a pipe having multiple outlets is considered as an advanced problem in hydraulic engineering; many discrepancies were found in the literature, in addition to the lack of experimental and field studies. The main goal of this study is to simulate the flow in a pipe with multiple outlets in order to examine the existing methodologies for estimation of the friction head losses, and to propose a methodology that is based on experimental data. The main physical model in this study consisted of a water supply tank, a pipe with multiple outlets having a piezometer at each outlet. Different pipe diameters were used in this study, the pipe diameters were 25.4 mm (1 in), 38.1 mm (1.5 in), 50.8 (2 in) and 76.2 mm (3 in). The inlet heads used were 1.7 m and 2.2 m. The data collected from different flow conditions were used to assess the variation in the coefficient of friction and friction head losses along the pipe length. It can be concluded that the spacing between any two successive outlets (S) and area ratio (AR = Area of outlet/Area of the main pipe) are the main factors affecting the friction head losses along the pipe. The ratio of total friction head losses along a pipe with outlets having the same properties (length (L), discharge (Q), diameter (d) and material) to a pipe without outlets and having the same properties is called the G factor. The G factor calculated using selected formulae was overestimated in comparison to the calculated G factor obtained from experimental data. For large values of S/d (spacing between outlets/diameter of main pipe), the difference between coefficient of friction in first segment (f1) and last segment (fn) of the multiple outlet pipe was noted to be minimal.

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