scholarly journals FREIGHT AND PASSENGER VEHICLES PARTS RECONDITIONING TECHNIQUE

2017 ◽  
Vol 21 (1) ◽  
pp. 16-23
Author(s):  
V. V. Malihin ◽  
N. M. Gaidah ◽  
Yu. A. Artemenco ◽  
S. G. Novikov ◽  
F. V. Novikov
Keyword(s):  
Cutting Tools ◽  
Thermal Spraying ◽  
Physical And Mechanical Properties ◽  
Elastic Displacement ◽  
Machining Accuracy ◽  
Hard Alloys ◽  
Machining Efficiency ◽  
Wheel Wear ◽  
Wear Resistant ◽  
Passenger Vehicles

High accuracy and efficiency indices of machining of worn-out after continuous service parts, reconditioned using materials with high physical and mechanical properties have been studied; a reconditioning technique for worn-out surfaces of parts have been presented; to restore the dimensions of some parts, thermal spraying technique without inadmissible excessive heating of the parts has been chosen, and for another group of parts the process of manual argon-arc surfacing has been chosen; some specifications of the parts of the tram, trackless trolley bus, "KAMAZ", DT-75 tractor reconditioned by means of surfacing, coating and machining are given. Theoretical analysis of the conditions of the reduction of the elastic displacement value, appearing in a technological system during mechanical processing and determining the parameters of machining precision has been performed. Machining accuracy and efficiency improving features for grinding and cutting with cutting tools of parts with hardened (wear-resistant hardfacing materials with hardness up to HRC 63) function surfaces have been theoretically substantiated; some regularities of stock removal while grinding parts reconditioned using wear-resistant hardfacing materials have been analytically described, ways to improve the efficiency of their machining involving application of the method of deep grinding with the wheel periphery with rather low parts speed have been defined. Some ways to increase machining efficiency, to reduce energy consumption of machining and thickness of the cutting by grains of the wheel, and thus the wheel wear rate are presented. By means of calculations it was found out that realizing deep grinding of facing material, machining efficiency can increase by up to 8 times (with the same cutting thickness by a wheel grain) compared with the deep grinding of a solid (homogenous) material. Significant potential for grinding parts restored using wear-resistant surfacing materials, which opens new prospects for machining of resurfaced and face-hardened parts for freight and passenger vehicles, is shown. Potential for machining efficiency enhancement of the mentioned parts with cutting tools made of superhard synthetic materials, hard alloys with wear-resistant coatings, the use of damping cutters, and diamond-abrasive grinding is specified.

Improving the effectiveness of parts machining with wear-resistant surfacing alloys

2020 ◽  
pp. 53-55
Author(s):  
V.V. Malyihin ◽  
N.M. Gaydash ◽  
E.F. Romanenko ◽  
S.G. Novikov ◽  
F.V. Novikov ◽  
...  
Keyword(s):  
Technological System ◽  
Elastic Displacement ◽  
Machining Accuracy ◽  
Wear Resistant

The conditions of increasing the machining accuracy of parts restored by wear-resistant surfacing materials are analyzed. The directions of increasing the effectiveness of their processing by reducing the elastic displacement that occurs in the technological system during machining are determined. Keywords surfacing alloys, elastic displacement, grinding, accuracy, productivity, effectiveness. [email protected]

Synthesis of titanium carbide and titanium diboride for metal processing and ceramics production

2021 ◽  
Vol 23 (4) ◽  
pp. 155-166
Author(s):  
Yuri Krutskii ◽  
◽  
Evgeny Maksimovskii ◽  
Roman Petrov ◽  
Olga Netskina ◽  
...  
Keyword(s):  
Titanium Carbide ◽  
Boron Carbide ◽  
Titanium Diboride ◽  
Cutting Tools ◽  
Hard Alloys ◽  
Titanium Oxides ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Highly Dispersed

Introduction. Titanium carbide and diboride are characterized by high values of hardness, chemical inertness and for this reason are widely used in modern technology. This paper provides information on the synthesis of titanium carbide and diboride by carbothermal and carbide-boron methods, respectively, on the use of titanium carbide as an abrasive and in the manufacture of tungsten-free hard alloys, carbide steels, wear-resistant coatings, as well as titanium diboride in the production of cutting tools and ceramics based on boron carbide The aim of this work is to study the processes of synthesis of highly dispersed powders of titanium carbide and diboride, which are promising for the manufacture of cutting tools, wear-resistant coatings, abrasives and ceramics. Research methods. Titanium oxide TiO2, nanofibrous carbon (NFC), and highly dispersed boron carbide were used as reagents for the synthesis of titanium carbide and diboride. Experiments to obtain titanium carbide were carried out in a resistance furnace, and titanium diboride in an induction furnace. X-ray studies of the phase composition of titanium carbide and diboride samples were carried out on an ARL X-TRA diffractometer (Thermo Electron SA). The determination of the content of titanium and impurities in the samples of titanium carbide and diboride was carried out by the X-ray spectral fluorescence method on an ARL-Advant'x analyzer. The total carbon content in the titanium carbide samples was determined on an S-144 device from LECO. The content of boron and other elements for titanium diboride samples was determined by inductively coupled plasma atomic emission spectrometry (ICP AES) on an IRIS Advantage spectrometer (Thermo Jarrell Ash Corporation). The surface morphology and particle sizes of the samples were studied using a Carl Zeiss Sigma scanning electron microscope (Carl Zeiss). The determination of the particle/aggregate size distribution was performed on a MicroSizer 201 laser analyzer (BA Instruments). Results. The paper proposes technological processes for obtaining highly dispersed powders of titanium carbide and diboride. The optimum synthesis temperature for titanium carbide is 2,000…2,100 oC, and for titanium diboride 1,600…1,700 oC. The content of the basic substance is at the level of 97.5…98.0 wt. %. Discussion. A possible mechanism for the formation of titanium carbide and diboride is proposed, which consists in the transfer of vapors of titanium oxides to the surface of solid carbon (synthesis of titanium carbide) and vapors of boron and titanium oxides to the surface of solid carbon (synthesis of titanium diboride). Due to the high purity and dispersion values, the resulting titanium carbide powder can be used as an abrasive material and for the manufacture of tungsten-free hard alloys, carbide steels, wear-resistant coatings, and titanium diboride powder can be used for the preparation of cutting tools and ceramics based on boron carbide.

Use of hard alloys based on titanium carbide as wear-resistant materials and cutting tools

1977 ◽  
Vol 16 (5) ◽  
pp. 394-397
Author(s):  
N. N. Sereda ◽  
M. S. Koval'chenko ◽  
I. T. Belik ◽  
V. G. Solomenko ◽  
V. V. Uvarov ◽  
...  
Keyword(s):  
Titanium Carbide ◽  
Cutting Tools ◽  
Hard Alloys ◽  
Wear Resistant

Investigation of the influence of the thickness of nanolayers in wear-resistant layers of Ti-TiN-(Ti,Cr,Al)N coating on destruction in the cutting and wear of carbide cutting tools

2020 ◽  
Vol 385 ◽  
pp. 125402 ◽  
Author(s):  
Alexey Vereschaka ◽  
Vladimir Tabakov ◽  
Sergey Grigoriev ◽  
Nikolay Sitnikov ◽  
Filipp Milovich ◽  
...  
Keyword(s):  
Cutting Tools ◽  
Wear Resistant

Nanostructural wear-resistant coatings produced on metal-cutting tools by electric-arc evaporation and magnetronic sputtering

2010 ◽  
Vol 30 (9) ◽  
pp. 910-920 ◽  
Author(s):  
F. V. Kiryukhantsev-Korneev ◽  
N. A. Shirmanov ◽  
A. N. Sheveiko ◽  
E. A. Levashov ◽  
M. I. Petrzhik ◽  
...  
Keyword(s):  
Metal Cutting ◽  
Cutting Tools ◽  
Electric Arc ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Arc Evaporation

Improvement of Solution Type Plasma Spraying Process

2005 ◽  
Vol 502 ◽  
pp. 505-510 ◽  
Author(s):  
Masami Futamata ◽  
Xiaohui Gai ◽  
Toyokazu Mizumoto ◽  
Kimio Nakanishi
Keyword(s):  
Mechanical Properties ◽  
Plasma Spraying ◽  
Hollow Cathode ◽  
Thermal History ◽  
Thermal Spraying ◽  
Physical And Mechanical Properties ◽  
Good Reproducibility ◽  
Solution Type ◽  
Plasma Spraying Process ◽  
Spraying Process

To fabricate thermal spraying coatings with good reproducibility, it is necessary to improve the process of the equalization of both thermal history and impacting behavior of the particles. In this study, the characteristics of the solution type plasma spraying using the hollow-cathode type torch are investigated. The physical and mechanical properties that are different from usual thermal spraying coatings are described. By using solutions including metal ingredients in a state of ion, colloid or sol, thinner coating that cannot be made by conventional plasma spraying methods is formed on various substrates. The coatings are uniform in appearance.

Use of Archard’s Wear Law for the Calculation of Uniform Wheel Wear of High Tonnage Freight Vehicles

2013 ◽  
Author(s):  
Carlos Casanueva ◽  
Per-Anders Jönsson ◽  
Sebastian Stichel
Keyword(s):  
Contact Point ◽  
Wheel Wear ◽  
Contact Conditions ◽  
Passenger Vehicles ◽  
Calculation Methodology ◽  
Wear Calculation ◽  
Wheel Profile ◽  
Wear Law ◽  
Equivalent Conicity ◽  
Freight Vehicles

Wheel profile evolution has a large influence on track and wheelset related maintenance costs. It influences important parameters such as equivalent conicity or contact point positioning, which will affect the dynamic behavior of the vehicle, in both tangent track and curve negotiation. High axle loads in freight wagons may increase both the wheel wear and the damage caused by vehicles with both new and already worn profiles. A common profile in Europe is the S1002 profile, developed for rail inclination 1/40. In Sweden rail inclination is 1/30, so contact conditions might not be optimal. The presented work uses Archard’s wear law to analyze the profile wear evolution in a two axle freight vehicle with Unitruck running gear on the Swedish network. This wear calculation methodology has been successfully used to predict uniform wear in passenger vehicles. First, the vehicle model has been optimized in order to improve the speed of the wear simulations. Experimental measurements of wheel profiles have been performed in order to validate the simulations. The conclusion is that the wear methodology successfully used to predict uniform wheel wear in passenger vehicles cannot be directly applied for the calculation of wheel profile evolution in high tonnage freight vehicles. The influence of block brakes or switches and crossings cannot be dismissed when calculating uniform wheel wear in these cases.

A Small-Line Segment Dynamic Transition Algorithm Based on Axial Error Tolerance

2016 ◽  
Vol 851 ◽  
pp. 433-438
Author(s):  
Shu Jie Sun ◽  
Hu Lin ◽  
Liao Mo Zheng ◽  
Jin Gang Yu ◽  
Bei Bei Li ◽  
...  
Keyword(s):  
Tool Path ◽  
Maximum Velocity ◽  
Error Tolerance ◽  
Contour Error ◽  
Work Piece ◽  
Machining Accuracy ◽  
Machining Efficiency ◽  
Processing Efficiency ◽  
Dynamic Transition ◽  
Machining Quality

To ensure the machining precision of work piece and improve the machining quality and machining efficiency, a dynamic transition method based on axial machining accuracy is given. Firstly, the maximum machining contour error is computed based on the axial machining accuracy, and the tool path is processed based on the machining contour error to reduce the amount of command points. Secondly, the circle transition method is used to make the tool path smoother and the machining efficiency higher. Finally, the radius of the transition circle is adjusted based on the maximum velocity of each transition circle. The experimental results shows that the method proposed could effectively satisfy the needs of the machining accuracy and improve the processing efficiency, while reduce the amount of path data.

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