TECHNOLOGICAL SUPPORT OF WEAR RESISTANCE OF THE DIESEL CYLINDER MIRROR

2020 ◽  
Author(s):  
Aleksandr Yamnikov ◽  
L Safarova
Keyword(s):  
Wear Resistance ◽  
Diesel Engine ◽  
Technological Process ◽  
Outer Surface ◽  
Dimensional Accuracy ◽  
Variable Stiffness ◽  
Roughness Parameters ◽  
Elastic Deformations ◽  
Technological Support ◽  
Diesel Cylinder

The article is devoted to the achievement of the maximum wear resistance of the cylinder mirror of a diesel engine by technological provision of a given dimensional accuracy and geometric shape of the cylinder mirror, as well as roughness parameters in accordance with a given Abbott diagram. The solution of the problem is complicated by the inhomogeneity of the structure of the metal of the casting and the geometry of the outer surface of the cast cooling fins of the cylinder, which leads to variable stiffness and inconstancy of elastic deformations when cutting the cylinder. The problem was solved by optimizing the structure of the technological process and replacing the equipment with a new, more rigid and accurate one.

Dimensional-time relationships of the technological process of manufacturing a "ТМЗ—450Д" diesel cylinder

2021 ◽  
pp. 34-39
Author(s):  
Keyword(s):  
Diesel Engine ◽  
Technological Process ◽  
Natural Aging ◽  
Machine Building ◽  
Incorrect Choice ◽  
Dimensional Changes ◽  
Diesel Cylinder ◽  
Building Plant ◽  
Machine Building Plant ◽  
Shape And Size

Changes in the dimensions of the main bore of the cylinder of a "ТМЗ-450Д" diesel engine in the technological process of its mechanical and thermal treatment at the Tula Machine-Building Plant are analyzed. The accepted sequence of operations is presented: turning with CNC — aging — boring — aging — honing — aging — honing — honing — honing — aging. An incorrect choice of the cylinder basing scheme was noted during the first operations. A new version of the technological process of mechanical and heat treatments is proposed, including natural aging and the use of double boring on a modular boring machine, which made it possible to reduce the number of honing operations to one, including rough and finish steps. Keywords: shape and size errors, aging, dimensional changes, basing, boring, honing, Abbot diagram. [email protected]

scholarly journals Analysis and Prediction of Wear Performance of Different Topography Surface

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5056
Author(s):  
Ben Wang ◽  
Minli Zheng ◽  
Wei Zhang
Keyword(s):  
Surface Roughness ◽  
Wear Resistance ◽  
Characteristic Parameter ◽  
Surface Wear ◽  
Roughness Parameters ◽  
Wear Performance ◽  
Surface Roughness Parameters ◽  
Element Simulation ◽  
Incidence Analysis ◽  
Sliding Distance

Surface roughness parameters are an important factor affecting surface wear resistance, but the relevance between the wear resistance and the surface roughness parameters has not been well studied. This paper based on the finite element simulation technology, through the grey incidence analysis (GIA) method to quantitatively study the relevance between the wear amount of per unit sliding distance (ΔVs) and the surface texture roughness parameters under dry friction conditions of the different surface topography. A zeroth order six-variables grey model, GM(0,6), for prediction the wear characteristic parameter ΔVs was established, and the experiment results verified that the prediction model was accurate and reasonable.

Cracking in Cast Iron Diesel Engine Cylinder Heads

1970 ◽  
Vol 185 (1) ◽  
pp. 807-823 ◽  
Author(s):  
L. W. L. Smith ◽  
H. T. Angus ◽  
A. D. Lamb
Keyword(s):  
Cast Iron ◽  
Diesel Engine ◽  
Experimental Work ◽  
Cylinder Head ◽  
Cooling Water ◽  
Test Apparatus ◽  
Directed Flow ◽  
Critical Areas ◽  
Engine Cylinder ◽  
Diesel Cylinder

The nature and mechanism of cracking in cast iron diesel cylinder heads arising from the differential thermal strains which occur in service are reviewed. The results of experimental work with test apparatus simulating the conditions in a cylinder head are presented, illustrating the importance of controlling the boiling conditions of the water at the cooling face of the flame deck. It is concluded that cylinder head temperatures, and therefore the danger of cracking, can be successfully reduced by increasing the flow of cooling water over critical areas by some form of directed flow.

New In-Situ Technology for Marine Diesel Engine Crankshaft Renovation and its 3D Surface Texture Model

2012 ◽  
Author(s):  
Toms Torims ◽  
Branko Katalinic ◽  
Andris Ratkus ◽  
Janis Vilcans ◽  
Marcis Zarins
Keyword(s):  
Surface Roughness ◽  
Diesel Engine ◽  
Machining Process ◽  
Marine Diesel Engine ◽  
Roughness Parameters ◽  
Surface Roughness Parameters ◽  
3D Surface ◽  
Crankshaft Journal ◽  
Marine Diesel ◽  
Engine Crankshaft

Repairing marine diesel engine crankshafts is a significant part of overall engine repairs and thus is very important for the ship building and ship repair industry. When a ship’s diesel engine is repaired, crankshaft journal surfaces must be renewed according to very precise geometrical and surface roughness requirements. Although current technologies are sufficient to meet these requirements, they are very time consuming and consequently expensive. A comprehensive research into the surface machining of marine diesel engine crankshaft journals allowed to improve technological processes and to identify respective surface roughness parameters, as well as to provide appropriate technological recommendations. It is important to note that crankshaft journal surfaces must be seen as 3D objects, whose micro-topographical surface roughness parameters have to be defined so that they reflect the actual surface. To summarize all available scientific research in this field, we can state that there has been no analysis into the impact of technological regimes on the surface micro-topography of marine engine crankshaft journals. Bearing in mind the aforementioned arguments a study has been launched to develop a novel grinding technology, enabling diesel engine crankshafts with medium-sized crankpin journals to be repaired directly inside the engine housing. This paper covers the following issues: 1) Description of the novel technological equipment for crankshaft journal grinding; 2) 3D roughness model of the crankshaft journal surface; 3) calculation of 3D parameters based on practical metrological and technological characteristics. This technology saves significant financial resources as well as reduces engine repair time. By solving problems related to surface accuracy, it is possible to considerably improve the crankshaft machining process, along with the performance of maintenance operations and consequently the overall quality of repair work. In this paper, the crankshaft journal surfaces will be defined using 3D surface roughness parameters.

scholarly journals Technological support of selective transfer on friction surface

2021 ◽  
Vol 2021 (5) ◽  
pp. 35-39
Author(s):  
Viktor Hohlov
Keyword(s):  
Friction Surface ◽  
Selective Transfer ◽  
Roughness Parameters ◽  
Processing Methods ◽  
Technological Support ◽  
Friction Surfaces

Dependences for the computation of roughness parameters and their technological support essential for selective transfer on friction surfaces are offered. Processing methods which should be used for their fulfillment are shown.

The Research on Hard Cutting the Powder Metallurgy Valve Seat

2016 ◽  
Vol 693 ◽  
pp. 1177-1181
Author(s):  
Ning Ding ◽  
Hai Dong Yang ◽  
Xiao Jun Niu ◽  
Hong Yun Chen
Keyword(s):  
Surface Roughness ◽  
Wear Resistance ◽  
High Temperature ◽  
Powder Metallurgy ◽  
Temperature Stability ◽  
High Hardness ◽  
Dimensional Accuracy ◽  
High Temperature Stability ◽  
Valve Seat ◽  
Hard Cutting

Powder metallurgy valve seat is an important part for engine; the material has excellent properties such as the wear-resistance of high temperature, corrosion proof and high temperature stability etc. But because of its high hardness, porous nature and contains many microscopic characteristics of the hard particles and the like, common tools cut these parts wear out quickly. And the valve seat requires higher dimensional accuracy and surface roughness, so these bring a lot of difficulties to cut these parts. Because of Polycrystalline Cubic Boron Nitride (hereafter referred to as PCBN) cutting tool has such advantages as high hardness; wear resistance; minimum surface roughness, so it has a great advantage on hard cutting the powder metallurgy valve seat. By hard cutting the powder metallurgy valve seat experiments, to research on the wear form and the cutting parameters impact on the cutting force.

Technology of sliding friction surface machining based on hard wear-resistant coating use taking into account technological inheritance impact

2020 ◽  
Vol 2020 (12) ◽  
pp. 31-38
Author(s):  
Tatiana Mihalenko
Keyword(s):  
Wear Resistance ◽  
Friction Surface ◽  
Sliding Friction ◽  
Quality Parameters ◽  
Surface Machining ◽  
Technological Support ◽  
Coating Application ◽  
Technological Inheritance ◽  
Theoretical Investigations ◽  
Friction Surfaces

The matters of technological support of wear-resistance for sliding friction surfaces are considered. The results of experimental theoretical investigations of modes impact of preliminary machining, coating application and sliding friction surfaces finishing upon their quality parameters are shown.

A GEOMETRICAL SURFACE TEXTURE STUDY OF CYCLOID DRIVE DISCS AFTER BENCH TESTS

Tribologia ◽  
2021 ◽  
Vol 297 (3) ◽  
pp. 27-33
Author(s):  
Krzysztof Olejarczyk ◽  
Marek Kalbarczyk
Keyword(s):  
Wear Resistance ◽  
Working Conditions ◽  
Surface Texture ◽  
Potential Application ◽  
Bench Test ◽  
Roughness Parameters ◽  
Bench Tests ◽  
Lubrication Film ◽  
Test Parameters ◽  
Before And After

The article presents the results of a geometrical surface texture study of cycloid drive discs after bench tests. For this purpose, the working surfaces, such as peak and valley areas of the epicycloid and the holes inner surfaces of both discs, were investigated using contact profilometry. From each surface, a transverse profiles were extracted, before and after 50 cycles of bench test. The discs and the profiles were examined for signs of wear and roughness changes. For each profile, the Ra and Rz roughness parameters were determined. On the base of the obtained profiles and the values of roughness parameters, it can be stated that the assumed test parameters provide stable working conditions, with an uninterrupted lubrication film, which results in practically negligible and unmeasurable wear. Taking into account the operating specification of a helicopter winch as an example of potential application of the presented cycloidal drive, the developed solution fulfils the requirements concerning wear resistance.

Composite Layers TiAlIntermetallic/PVD Coating Obtained by Hybrid Surface Treatment Technology on Aluminium Alloys

2015 ◽  
Vol 237 ◽  
pp. 34-40
Author(s):  
Jerzy Smolik ◽  
Adam Mazurkiewicz ◽  
Joanna Kacprzyńska-Gołacka ◽  
Michał Rydzewski
Keyword(s):  
Wear Resistance ◽  
Technological Process ◽  
Intermetallic Layer ◽  
Composite Layer ◽  
Layer Growth ◽  
Hybrid Layer ◽  
Treatment Technology ◽  
Composite Layers ◽  
Arc Evaporation ◽  
Nanohardness Tester

The paper presents the results of tests on an “intermetallic layer TiAl / coating AlCrTiN" hybrid layer, which was obtained using a hybrid method combining magnetron Sputtering, diffusion, and arc evaporation in a single technological process. The hybrid layer obtained was subjected to studies on morphology and chemical composition using the TM3000 scanning electron microscope. Additionally, hardness and Young's modulus as a function of distance from the surface were measured using a nanohardness tester CSM. Based on the analysis of the results obtained, the authors suggest the mechanism of layer growth in the technological process. The composite layer was also subjected to wear resistance using the ball-cratering method and erosion resistance tests using the glass powder. The obtained results showed that the Ti-Al intermetallic / AlCrTiN hybrid layer significantly increases resistance to abrasion as well as erosion wear resistance of the Ak12 alloy.

Preparation of SiC-Low Chromium Cast Iron Composite Material by Cast-Infiltration

2011 ◽  
Vol 189-193 ◽  
pp. 3972-3975
Author(s):  
Ning An
Keyword(s):  
Wear Resistance ◽  
Composite Material ◽  
Cast Iron ◽  
Composite Layer ◽  
Dimensional Accuracy ◽  
Steel Matrix ◽  
Matrix Composites ◽  
Sic Particles ◽  
The Matrix ◽  
Chromium Cast Iron

Low-chromium cast iron as the matrix, SiC particles as reinforcement, water glass sand in ordinary dry type, no negative pressure conditions, the use made of composite diffusion agent, prepared the surface of SiC particulate reinforced steel matrix composites. The results show that: SiC particles penetrate the surface of the composite material has excellent wear resistance, with the content of SiC particles increase the wear resistance of composite cast layer increased, when the SiC particle content of 20%, the wear resistance to achieve the best good. The hardness of up to 3000HV composite layer above. Smooth casting surface roughness, dimensional accuracy is more accurate, composite layer and substrate is good.

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