scholarly journals Exploitation Characteristics of Teeth Flanks of Gears Regenerated by Three Hard-Facing Procedures

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4203
Author(s):  
Svetislav Marković ◽  
Dušan Arsić ◽  
Ružica R. Nikolić ◽  
Vukić Lazić ◽  
Branislav Hadzima ◽  
...  
Keyword(s):  
Manufacturing Process ◽  
Filler Metal ◽  
Surface Characteristics ◽  
Working Ability ◽  
Gear Teeth ◽  
Geometrical Accuracy ◽  
Metal Type ◽  
Machine Parts ◽  
Hereditary Properties

Numerous phenomena that occur during the process of machine parts’ regeneration have a significant impact on the loss of their working ability. Therefore, the properties of the working surfaces of the teeth flanks of repaired gears were analyzed in this research. The hereditary properties of the gear teeth are expressed by the interdependence of their geometric and physical-mechanical-metallurgical parameters created during the technological operations of regeneration of worn teeth by welding/hard-facing. The hard-facing was executed with three filler metal types, namely: combination Inox 18/8/6 + EDur 600, Castolin 2 and UTP 670. The tested properties included geometrical accuracy, microstructure and microhardness. Evaluation of the executed regeneration procedures was done by comparing the mentioned parameters of the regenerated gears and the new ones. The tested gears were not withdrawn from production due to damage, but they were newly manufactured and intentionally damaged gears, made of the same materials, subjected to the same manufacturing process. In this way, all influences except for the considered filler metal type were eliminated. Based on results of the conducted experiments, it was possible to establish the influence of the filler metal type on the surface characteristics of the regenerated gears’ teeth flanks.

scholarly journals Effect of Filler Metal Type on Microstructure and Mechanical Properties of Fabricated NiAl Bronze Alloy Using Wire Arc Additive Manufacturing System

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 513
Author(s):  
Jae Won Kim ◽  
Jae-Deuk Kim ◽  
Jooyoung Cheon ◽  
Changwook Ji
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Additive Manufacturing ◽  
Filler Metal ◽  
Gas Metal Arc Welding ◽  
Metal Wire ◽  
Cold Metal Transfer ◽  
Metal Type ◽  
Cold Metal ◽  
Wire Arc Additive Manufacturing

This study observed the effect of filler metal type on mechanical properties of NAB (NiAl-bronze) material fabricated using wire arc additive manufacturing (WAAM) technology. The selection of filler metal type is must consider the field condition, mechanical properties required by customers, and economics. This study analyzed the bead shape for representative two kind of filler metal types use to maintenance and fabricated a two-dimensional bulk NAB material. The cold metal transfer (CMT) mode of gas metal arc welding (GMAW) was used. For a comparison of mechanical properties, the study obtained three specimens per welding direction from the fabricated bulk NAB material. In the tensile test, the NAB material deposited using filler metal wire A showed higher tensile strength and lower elongation (approx. +71 MPa yield strength, +107.1 MPa ultimate tensile strength, −12.4% elongation) than that deposited with filler metal wire B. The reason is that, a mixture of tangled fine α platelets and dense lamellar eutectoid α + κIII structure with β´ phases was observed in the wall made with filler metal wire A. On the other hand, the wall made with filler metal wire B was dominated by coarse α phases and lamellar eutectoid α + κIII structure in between.

Technical Support for the Health of the Reducers of Construction Machines on the Basis of Application Device for the Application of Hard Coatings

2019 ◽  
Vol 945 ◽  
pp. 724-728
Author(s):  
O.V. Burlachenko ◽  
V.N. Zlobin ◽  
A.O. Burlachenko
Keyword(s):  
New Technology ◽  
Hard Coatings ◽  
Hard Alloys ◽  
Gear Teeth ◽  
Hard Materials ◽  
Diffusion Coatings ◽  
Hardening Coatings ◽  
Modes Of Processing ◽  
Machine Parts ◽  
Experimental Researches

The new technology of ensuring efficiency of reducers of construction machines is offered. The technology is based on the application of hardening coatings on the contact surface of the gear teeth. To implement the method, the authors developed an installation for applying hardening coatings by ion implantation. Similar devices used for the application of hard materials in the form of diffusion coatings on hot parts of tooling and machine parts are described. It is shown that the proposed installation has a greater technical and economic efficiency compared to existing analogues. The description of the design and operating principle of the proposed device is presented. The results of experimental researches of efficiency of the offered technology are presented. The modes of processing allowing to achieve the maximum indexes of working capacity are picked up. The conducted researches have shown the efficiency of the offered technology for the details from hard alloys.

scholarly journals Agricultural machine parts quality control by dynamic non-destructive methods

2018 ◽  
Vol 226 ◽  
pp. 04034 ◽  
Author(s):  
Alexey N. Beskopylny ◽  
Viktor B. Rykov ◽  
Elena M. Zubrilina ◽  
Andrey D. Chistyakov
Keyword(s):  
Quality Control ◽  
Wear Resistance ◽  
Manufacturing Process ◽  
Mechanical Characteristics ◽  
Point Of View ◽  
Agricultural Machinery ◽  
Machine Parts ◽  
Non Destructive ◽  
Destructive Methods

The problem of quality control of agricultural machinery parts by means of dynamic non-destructive methods of impact indentation of conical shape indenters is considered. Quality of the crucial parts is considered from the point of view of a set of mechanical characteristics that determine the strength, hardness, wear resistance and deformability. These characteristics must be known and be able to control on all the details promptly and accurately both in the manufacturing process and in operation. The mechanical characteristics of metals are stochastic in nature. For this purpose, an impact indentation device was developed, and the method based on probabilistic laws of dispersion of mechanical characteristics is obtained.

scholarly journals Review of the Hard-Facing Technology Application for Reparation of the Given Parts in Various Branches of Industry

2018 ◽  
Vol 1 (1) ◽  
pp. 279-285
Author(s):  
Vukić Lazić ◽  
Dušan Arsić ◽  
Milan Mutavdžić ◽  
Ružica Nikolić ◽  
Jozef Meško ◽  
...  
Keyword(s):  
Filler Metal ◽  
Technology Application ◽  
Post Process ◽  
Parameters Selection ◽  
Complex Shapes ◽  
Machine Parts ◽  
Definition Of ◽  
The Right ◽  
The Given ◽  
Selection Of

Abstract This paper deals with the problem of defining the optimal procedure for reparation of the machine parts of large dimensions and complex shapes. The procedure consists of establishing the causes of the part's damages, definition of the reparation technology, with selection of its parameters and ways of execution. The reparation is done by hard-facing, with heat treatment that consists of preheating, additional heating and the post hard-facing tempering. The process parameters' selection includes choosing the right filler metal(s), ways and order of depositing the hard-faced layers, ways of reaching and maintaining the preheating temperatures, checking of the base metal's chemical composition and mechanical properties and deciding on the post-process heat and mechanical processing of the executed hard-facing. The executed reparation of the forging hammer's mallet, presented in details, serves as an example how the reparation can successfully serve as a substitute for procuring the new part and thus producing the savings both directly in lower costs and indirectly in shortening the down-time of the damaged part operation.

INFLUENCE OF SHOT PEENING ON SURFACE CHARACTERISTICS OF HIGH-SPEED STEELS

2008 ◽  
Vol 22 (31n32) ◽  
pp. 6094-6099 ◽  
Author(s):  
YASUNORI HARADA ◽  
KENZO FUKAURA
Keyword(s):  
Shot Peening ◽  
Metal Forming ◽  
High Speed ◽  
Compressive Residual Stress ◽  
Surface Characteristics ◽  
Hard Materials ◽  
Machine Parts ◽  
Long Life ◽  
Compressive Residual Stresses ◽  
Hot Hardness

High-speed steels are generally used for the cutting of other hard materials. These are hard materials, and can be used at high temperatures. Therefore, some of them are used for warm metal forming such as forging. However, in the tools used in hot working, an excellent hot hardness and long-life fatigue are strongly required. In the present study, the influence of shot peening on the surface characteristics of high-speed steels was investigated. Shot peening imparts compressive residual stresses on the metal surface, thus improving the fatigue life of the machine parts. In the experiment, the shot peening treatment was performed using an air-type shot peening machine. The shots made of cemented carbide were used. The workpieces were two types, W -type and Mo -type alloys. Surface roughness, compressive residual stress, and hardness of the peened workpieces were measured. It was found that shot peening using the hard shot media was effective in improving the surface characteristics of high-speed steels.

scholarly journals Surface Characteristics of Dental Implant Fixture with Various Manufacturing Process

2010 ◽  
Vol 43 (1) ◽  
pp. 17-24
Author(s):  
Yong-Hoon Jeong ◽  
Young-Pil Moon ◽  
Chung-Hwan Lee ◽  
Jin-Woo Yu ◽  
Han-Cheol Choe
Keyword(s):  
Dental Implant ◽  
Manufacturing Process ◽  
Surface Characteristics

scholarly journals Influence of different hard-facing procedures on quality of surfaces of regenerated gears

2021 ◽  
Vol 27 (4) ◽  
pp. 257-264
Author(s):  
Ružica R. Nikolić ◽  
Svetislav Marković ◽  
Dušan Arsić ◽  
Vukić Lazić ◽  
Branislav Hadzima ◽  
...  
Keyword(s):  
Surface Hardness ◽  
Thermochemical Treatment ◽  
Operating Conditions ◽  
Tribological Characteristics ◽  
Shielded Metal Arc Welding ◽  
Additional Material ◽  
Gear Teeth ◽  
Metal Arc Welding ◽  
Machine Systems ◽  
Hereditary Properties

Abstract During the process of regeneration of machine parts, certain phenomena occur that have a significant impact on the loss of their working ability. Hereditary properties are expressed by the interdependence of geometric and physical-mechanical-metallurgical parameters of gear teeth created during the technological operations of regeneration of worn teeth by hard-facing. The influence of the type of additional material (electrodes and their combinations) on the tribological characteristics of welded gear teeth was considered, whereby the so-called hard additional materials were applied. Those are the additional materials that give the required surface hardness of the teeth without subsequent thermal or thermochemical treatment. This research did not involve the regeneration of specific worn gears removed from machine systems, but the new gears were made, which were then damaged and then regenerated by hard-facing using the shielded metal arc welding (SMAW) procedure. Thus, all the tested gears were made of the same material, belonged to one batch and were machined on the same machines with the same machining regimes. The tests were performed on samples made of 20MnCr5 steel for cementation, on a tribometer by the “block on disc” method, which was designed to simulate the operating conditions of coupled teeth of concrete gears in the exploitation conditions. Based on the conducted tribological tests, the average coefficients of friction and topography of the surfaces were determined by measuring the wear trace and it was defined which additional materials give the best tribological characteristics of the surfaces of gears regenerated by hard-facing.

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