SWIVEL JOINT WEAR-RESISTANCE INCREASE OF PROCESSING MACHINE MANIPULATORS

2021 ◽  
Vol 2021 (5) ◽  
pp. 32-39
Author(s):  
Vladimir Kapustin ◽  
Evgeniy Pamfilov ◽  
Elena Sheveleva ◽  
Galina Pilyushina
Keyword(s):  
Wear Resistance ◽  
Thermal Power ◽  
Thermal Capacity ◽  
Friction Unit ◽  
Functional Surface ◽  
Resistance Increase ◽  
Capacity Increase ◽  
Damping Characteristics ◽  
Physical And Chemical ◽  
Mechanical And Tribological Characteristics

The work purpose: the choice of promising design-technological ways to support high indices of wear-resistance and friction costs decrease with regard to conditions of parts operation in swivels. The research methods: the set of tribotechnical researches on wear-resistance, on friction loss and physical and chemical parameters. The novelty: there are offered fundamentals for development of new designs of sliding bearings with increased wear-resistance at the expense of the favorable stressed state formation in functional layers, and also thermal physical and damping indices. Investigation results: support of increased thermal conductivity and thermal capacity increase of the materials under consideration gives possibility to increase considerably the friction unit efficiency in swivels, and also at the expense of thermal power accumulation with structural constituents of materials. Wear-resistance increase in the friction unit is provided with the formation of residual compression stresses in a functional surface layer, and the presence of an expanded spring in the bearing system contributes to the increase of its damping characteristics. Conclusions: the design and technological methods offered for working capacity increase and life increase of swivel parts allow assuring increased mechanical and tribological characteristics to a considerable extent and optimizing thermal modes.

Study of the durability of the working body the dryer

2020 ◽  
pp. 56-60
Author(s):  
A. P. Chernysh
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Cast Iron ◽  
White Cast Iron ◽  
Low Cost ◽  
Functional Surface ◽  
Wear Coatings

In this article, the plant for heat treatment of grain material, namely perfo-rated spiral operating part, developed by the authors was chosen as the object of improving the wear resistance. The research was conducted in the laboratory of the Technology of Metals and Machinery Repair Department of Kemerovo State Agricultural Institute. The aim of the research is to select the most appropriate method of hardening the functional surface of perforated spiral operating part with the use of low-cost anti-wear coatings. The basis for choosing the method of surfacing the coating was the use of a method of forming the technological repair units (TRU), which allowed electric spark treatment with unalloyed white cast iron.

scholarly journals Reactivity of fly ashes milled in different milling devices

2019 ◽  
Vol 58 (1) ◽  
pp. 179-188 ◽  
Author(s):  
Yong-Sik Chu ◽  
Batmunkh Davaabal ◽  
Dae-Sung Kim ◽  
Sung-Kwan Seo ◽  
Yoo Kim ◽  
...  
Keyword(s):  
Particle Size ◽  
Fly Ash ◽  
Surface Area ◽  
Thermal Power ◽  
Chemical Properties ◽  
Particle Size Reduction ◽  
Attrition Mill ◽  
High Calcium ◽  
High Calcium Fly Ash ◽  
Physical And Chemical

Abstract The effect of two different milling devices, namely attrition mill versus vibration mill, on the reactivity of fly ash was studied. High calcium fly ash from 4th Thermal power station of Ulaanbaatar (Mongolia) was used for the experiments. The raw and processed samples were characterized by XRD, SEM, Particle size distribution, BET, Blaine surface area and density measurements. The efficiency of 1 hour milling was evaluated with the Blaine surface area set to be more than 5000 cm2/g. The physical and chemical properties of the attrition milled fly ash changed not much compared to the vibration milled samples. For example the d50 particle size became reduced from 29 µm to 6 µm by attrition milling and in vibration milled fly ash it was reduced to 7 µm. The density increased from 2.44 g/cm3 of raw fly ash to 2.84 g/cm3 and 2.79 g/cm3 in attrition and vibration milled samples, respectively. Mechanical milling revealed not only a particle size reduction but also the formation of a denser microstructure. As a result the vibration milled fly ash showed a weaker interaction with the alkaline solution (8 M NaOH used here) compared to the attrition milled fly ash. Consequently, compressive strength of the binder prepared using the attrition milled fly ash was higher, 61 MPa, while for vibration milled fly ash it was 49 MPa. For comparison unmilled fly ash, it was 21 MPa.

Preparation and Performance of Andalusite Bonded SiC Solar Heat-Absorbing Ceramics

2013 ◽  
Vol 320 ◽  
pp. 52-59
Author(s):  
Jian Feng Wu ◽  
Meng Liu ◽  
Xiao Hong Xu ◽  
Ya Xiang Zhang ◽  
Kun Li ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Bending Strength ◽  
Thermal Power ◽  
Chemical Properties ◽  
Xrd Analysis ◽  
Expansion Rate ◽  
Testing Technology ◽  
Firing Shrinkage ◽  
And Performance ◽  
Physical And Chemical

Using andalusite, SiC, Su Zhou Kaolin and Guang Xi quartz as materials, andalusite bonded SiC heat absorbing ceramic was prepared by pressureless firing in the ceramic preparation process. The influence of gradient SiC on microstructure and properties of the samples were studied. Using the testing technology of XRD, SEM, and etc., physical and chemical properties, phase composition and microstructure were tested and analysised.The results indicate that andalusite bonded SiC heat absorbing ceramic, which prepared to have a low firing shrinkage rate, high refractoriness and a good microstructure. The best firing temperature of the best formula C4 is 1460°C, firing expansion rate is 0.98%, bending strength is 32.52MPa,porosity is 30.74%, bulk density is 2.05g·cm-3, refractoriness is 1650°C,growth rate of oxidation weight is 2.769mg·cm-2and have no crack after 30 times thermal shock. The bending strength has increased 11.15% after thermal shock. XRD analysis indicated that the main phase compositions are α-SiC, mullite and cristobalite.SEM studies show that there are many connected pores in the samples, the diameters of the pores are 10~20μm. Andalusite bonded SiC heat absorbing ceramic have a low firing expansion rate, high bending strength and good microstructure, which is suit for tower type solar thermal power generation.

scholarly journals Wear resistance increase in friction surfaces of spherical journal bearings by finish plasma strengthening

2016 ◽  
Vol 1 (8) ◽  
pp. 42-48
Author(s):  
Александр Горленко ◽  
Aleksandr Gorlenko
Keyword(s):  
Wear Resistance ◽  
Chemical Precipitation ◽  
Journal Bearings ◽  
Antifriction Coating ◽  
Surface Strengthening ◽  
Resistance Increase ◽  
Nano Coating ◽  
Simultaneous Activation ◽  
Friction Surfaces ◽  
Distinguishing Features

The technology of finish plasma strengthening (FPS) with the multi-layer nano-coating of the Si-O-CN system as applied to the friction surface strengthening in spherical journal bearings is considered. This method relates to the processes of tubeless chemical precipitation of coatings at atmosphere pressure with the use of volatile fluids of element-organic compounds and gas environment with the simultaneous activation of a surface by electroarc plasma. The essence and distinguishing features of FPS are analyzed. Tribological characteristics of an applied wear resistant antifriction coating are investigated which stipulate for wear resistance increase in spherical journal bearings.

scholarly journals Wear resistance increase of sealings of mud end of pump

2021 ◽  
Vol 2094 (5) ◽  
pp. 052038
Author(s):  
I V Karnaukhov ◽  
A S Lunev ◽  
M D Pankiv ◽  
V I Afanasov ◽  
S P Dunaeva
Keyword(s):  
Wear Resistance ◽  
Working Conditions ◽  
Drilling Pump ◽  
Resistance Increase ◽  
Drilling Technology

Abstract In this paper, the qualification and the principle of operation of mud pumps are considered. The analysis of the malfunction of the hydraulic part of the pump is also considered. The importance of the work is due to the fact that it was proposed to introduce a support and sealing part of the cuff made of a material of different hardness. The working conditions of the drilling pump from the adopted drilling technology are also considered. An experiment was conducted with the help of which the dependence of the degree of wear of the seal on time was revealed, depending on the material. The importance of the work is due to the fact that the introduction of the support and sealing part of the cuff from a material of different hardness was proposed.

scholarly journals Microwave solid fuel ignition

2021 ◽  
Vol 2094 (5) ◽  
pp. 052054
Author(s):  
R V Kondratev
Keyword(s):  
Electromagnetic Field ◽  
Solid Fuel ◽  
Thermal Power ◽  
Experimental Studies ◽  
Chemical Properties ◽  
Ignition Process ◽  
Boiler Plant ◽  
Microwave Exposure ◽  
Unburned Fuel ◽  
Physical And Chemical

Abstract The article continues the study of the effect of microwave exposure on solid fuel. On the basis of the experimental studies, the dependences of changes in the temperature and humidity fields of the fuel on the time of microwave exposure, to arson, have been established. The possibility of using the microwave electromagnetic field to automate the process of burning solid fuel in a boiler plant, afterburning unburned fuel residues is considered. The mechanism and basic conditions of these processes are presented. The influence of this technology on the intensification of the fuel ignition process, its homogenization, an increase in energy characteristics and a change in the elemental composition, an increase in the efficiency of a boiler plant, a decrease in chemical, mechanical underburning and harmful emissions of a boiler plant is considered. The main conditions of the applied technology are: placement of the microwave generator on the combustion device of the boiler unit, the size of the solid fuel samples or its contacting pieces should be less than the wavelength of the microwave electromagnetic field (12.4 cm), the moisture content - within the range from 10 to 95%. The intensification of the process of burning solid fuel also depends on the type of fuel, its physical and chemical properties (various types of coal, wood fuel, including wood waste, peat, and others). Modernization of boiler plants using this technology is possible by unifying projects that take into account the correspondence of microwave generators to the thermal power of boiler units.

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