Adjustment of parameters of precision stamping of gear wheels on results of modeling of physical processes at their chemical and thermal processing

2021 ◽  
pp. 34-38
Author(s):  
V. G. Shibakov ◽  
D. L. Pankratov ◽  
R. V. Shibakov ◽  
R. S. Nizamov
Keyword(s):  
Thermal Treatment ◽  
Heating Temperature ◽  
Dimensional Accuracy ◽  
Internal Stresses ◽  
Shape Prediction ◽  
Heating And Cooling ◽  
Gear Ring ◽  
Number Of Cycles ◽  
Gear Wheels ◽  
Temperature Heating

The surface layer after chemical-thermal treatment in structure and physico-mechanical properties differs sharply from the inner layers of the product, which leads to significant internal stresses that cause deformation and warping, i.e. resizing and shape. Prediction of the phase composition, depth of carbon saturation of the layer, microhardness and deformation of the surface of the product elements after chemical-thermal treatment based on modeling in the application package allows even at the stage of technological preparation for the production of precision hot die forging to make adjustments to the geometry of the die tool to increase dimensional accuracy, and accordingly, the durability of the gear ring gears. The input data for modeling the processes of chemical-thermal treatment is a 3D model of the product with a finite element grid and the fixation scheme of the product, temperature and time modes (heating temperature, heating and cooling rate, holding time, number of cycles), type of carburizing cooling medium and its temperature, material details.

scholarly journals Study on the Thermal Treatment of Nano-Ag/TiO2 Thin Film

2011 ◽  
Vol 2011 ◽  
pp. 1-5
Author(s):  
Peng Bing ◽  
Wang Jia ◽  
Chai Li-yuan ◽  
Wang Yun-yan ◽  
Mao Ai-li
Keyword(s):  
Thin Film ◽  
Methyl Orange ◽  
Thermal Treatment ◽  
Photocatalytic Degradation ◽  
Tio2 Thin Film ◽  
Heating Temperature ◽  
Antibacterial Properties ◽  
Heating Time ◽  
Degradation Rates ◽  
Temperature Heating

The photocatalytic degradation rates of methyl orange and antibacterial properties of nano-Ag/TiO2 thin film on ceramics were investigated in this study. XRD was used to detect the structure of film to clarify the impacts on the rates and properties. The effect of film layers, heating temperature, heating time, and embedding of Ag+ on the degradation rates and antibacterial properties were ascertained. The nano-Ag/TiO2 film of 3 layers with AgNO3 3% embedded and treated at 350°C for 2 h would exhibit good performance.

THE STUDY OF TECHNOLOGICAL REGIMES OF HARDENING BANDAGE STEEL OF THE CONCENTRATED FLOW OF ENERGY

2019 ◽  
Vol 6 (3) ◽  
pp. 11-15
Author(s):  
Sultan Khamidovich Suleymanov ◽  
Elman Sayad ogli Nabiev ◽  
Valery Grigorevich Dyskin ◽  
Mustafa Umerovich Djanklich ◽  
Oleg Andreevich Dudko ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Energy Flow ◽  
Critical Speed ◽  
Heating Temperature ◽  
Solar Furnace ◽  
Flow Density ◽  
Optimum Temperature ◽  
Concentrated Flow ◽  
Heating And Cooling ◽  
Locomotive Wheels

The work is devoted to the development of technological modes of strengthening of the band steel of locomotive wheels by the method of thermal treatment with concentrated energy flow. Thermal treatment of the banding steel was carried out on a solar furnace at flow densities 320, 450 and 500 W/sm2. Quenching was carried out in air and water. Heating and cooling rates are important for quenching. If speed of cooling is less than critical speed ( V cr ≈ 50 deg/s), quenching is not observed. The hardness of the tempered steel samples after thermal treatment at a temperature of 800-1200°C and treated in water reaches ≈726 HB, that is not optimum for bandage steel.The optimum temperature for quenching the band steel is 730-780°C at a flow density of 450 W/sm2. At the heating temperature of the steel samples 730-780°C and cooling by quenching into water, the hardness of the band steel is the required value of 350-400 HB. By changing the heating temperature and cooling rate of the steel, a predetermined hardness can be controlled and obtained.

Numerical Simulation and Process Optimization of Automotive Friction Materials in Warm Pressing Forming

2013 ◽  
Vol 788 ◽  
pp. 57-60
Author(s):  
Chun Cao ◽  
Chun Dong Zhu ◽  
Chen Fu
Keyword(s):  
Process Optimization ◽  
Heating Temperature ◽  
Maximum Energy ◽  
Heating Time ◽  
Product Performance ◽  
Forming Process ◽  
Friction Materials ◽  
Forming Technology ◽  
The Relationship ◽  
Temperature Heating

Warm pressing forming technology has been gradually applied to the forming of automotive friction materials. How to ensure product performance to achieve the target at the same time achieve the maximum energy saving is the research focus of this study. In this paper, by using finite element method, the field of automotive friction materials in warm pressing forming was analyzed, reveals the relationship between the temperature field and the heating temperature/heating time. Furthermore, the energy consumption was analyzed and compared it with hot pressing forming process. The results will have significant guiding to the process optimization in warm pressing forming.

Design and Testing of Innovative Rotational Mould Heated by Thermal Fluid

2010 ◽  
Author(s):  
M. D. Monzo´n ◽  
A. N. Beni´tez ◽  
P. Bordo´n ◽  
P. M. Herna´ndez ◽  
M. D. Marrero ◽  
...  
Keyword(s):  
Cycle Time ◽  
Energetic Efficiency ◽  
Internal Stresses ◽  
Cycle Times ◽  
Transfer Processes ◽  
Computational Fluids Dynamics ◽  
Heating And Cooling ◽  
Computational Fluids ◽  
Plastic Parts ◽  
Design And Testing

Rotomoulded plastic parts have no internal stresses, as it is a process carried out at lower temperatures than injection moulding and no pressure is applied. The main disadvantage is the high cycle times needed. This paper focuses on reducing this cycle time and in producing a mould using standardized parts. For cycle time reducing, it is proposed to heat the mould by thermal fluid in continuous circulation; heat transfer processes have been studied for over 20 different configurations of the oil’s inlet – outlet, obtaining acceptable results with a manifold with 25 perforations in the front and rear faces. This configuration has been optimized by computational fluids dynamics, allowing reducing heating and cooling time and improving the energetic efficiency and the uniformity of heating. Design, simulations and testing of a 100 mm3 cube have been carried out in order to produce a standardized mould; this mould consists in some standardized parts and a nickel shell, obtained by rapid prototyping and electroforming process. This shell can be removed from the rest of elements in the mould, allowing thus to obtain parts with any other geometry just by changing the nickel shell. An experimental machine for testing has been developed as well.

Application of preliminary low-temperature heating for cold forming of complex parts on cold former

2021 ◽  
pp. 396-399
Author(s):  
V.Yu. Lavrinenko ◽  
Yu.A. Lavrinenko ◽  
R.S. Fayruzov ◽  
A.S. Ayrapetyan ◽  
A.S. Kirsanov
Keyword(s):  
Low Temperature ◽  
Heating Temperature ◽  
Experimental Studies ◽  
Life Time ◽  
Cold Forging ◽  
Flow Curves ◽  
Cold Forming ◽  
40Kh13 Steel ◽  
Temperature Heating ◽  
Complex Parts

The results of experimental studies of flow curves of 32CrB4, 20G2R and 1.4034 (analogue of 40Kh13 steel) steels at different heating temperature of workpieces are presented. Rational intervals of preliminary lowtemperature heating of workpieces made of studied steels are obtained. It allows to decrease forces during cold forging, loads on the working tool and to increase of tool life time up to 2 times.

Process of Shaped Metal Billets Production from Compositions Based on Iron Powder, Iron Oxide, and Binder

2017 ◽  
Vol 265 ◽  
pp. 250-258
Author(s):  
V.A. Dovydenkov ◽  
O.S. Zvereva ◽  
S.Ya. Alibekov
Keyword(s):  
Iron Oxide ◽  
Thermal Treatment ◽  
Solid Phase ◽  
New Technology ◽  
Physical And Mechanical Properties ◽  
Dimensional Accuracy ◽  
Uniform Density ◽  
Protective Medium ◽  
Experimental And Theoretical Studies ◽  
Mim Technology

A new technology of metal billets production by molding and thermal treatment of compositions based on iron powders of medium dispersion, fine powders of iron oxide, and the thermosetting binder, which provides for the required physical and mechanical properties of the material, is proposed. It is found that, at a certain concentration and dispersion of the components of the solid phase, the injection and direct compression molding of parts of complex shape (similar to the MIM-technology) is possible at pressures from 70 MPa to 100 MPa ensuring uniform density over the cross section. The established stages of thermal treatment of compositions, thermal behavior and protective medium ensuring uniformity of products, and chemical composition of the product material are presented in the paper. The experimental and theoretical studies of the dimensional accuracy of steel products obtained by the developed technology were carried out, and it was discovered that the produced parts were of the precision of steel parts produced by MIM-technology.

scholarly journals Experimental Investigation of Mechanical Properties of PVC Polymer under Different Heating and Cooling Conditions

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Sarkawt Rostam ◽  
Alan Kareem Ali ◽  
Firdaws Haidar AbdalMuhammad
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
Room Temperature ◽  
Heating Temperature ◽  
Industrial Applications ◽  
Standard Samples ◽  
Heating And Cooling ◽  
Working Environments ◽  
Cooling Conditions ◽  
Temperature Ranges

Due to a widely increasing usage of polymers in various industrial applications, there should be a continuous need in doing research investigations for better understanding of their properties. These applications require the usage of the polymer in different working environments subjecting the material to various temperature ranges. In this paper, an experimental investigation of mechanical properties of polyvinyl chloride (PVC) polymer under heating and cooling conditions is presented. For this purpose standard samples are prepared and tested in laboratory using universal material testing apparatus. The samples are tested under different conditions including the room temperature environment, cooling in a refrigerator, and heating at different heating temperatures. It is observed that the strength of the tested samples decreases with the increasing of heating temperature and accordingly the material becomes softer. Meanwhile the cooling environments give a clear increasing to the strength of the material.

Potential of Upgrading Domestic Biomass into a Higher Energy Density via Torrefaction Process

2013 ◽  
Vol 795 ◽  
pp. 620-625
Author(s):  
A.M. Iqbal ◽  
Z.A. Zainal ◽  
A.M. Mustafa Al Bakri ◽  
M. Mazlan ◽  
S.N. Soid ◽  
...  
Keyword(s):  
Thermogravimetric Analysis ◽  
Energy Density ◽  
Thermal Treatment ◽  
Heating Temperature ◽  
Energy Output ◽  
Light Weight ◽  
Fixed Carbon ◽  
Heating Value ◽  
Wood Sawdust ◽  
Treatment Step

Torrefaction is a thermal treatment step in a relatively low temperature range of 240-300°C, which aims to produce a higher energy biomass in terms of low heating value (LHV) and light weight properties. Biomass in wood (sawdust) was used in this work due availability in tropical climate and relatively cheap. LHV of torrified sawdust was found to be increases as heating temperature increased, in absence of oxygen content. This is enhanced by way of decomposing the hemicelluloses fraction. The thermogravimetric analysis (TGA) records the changes occurred in fixed carbon, volatile and ash in which it was recorded that an increase of fixed carbon and ash is seen in the increases of temperature and a decrease of volatile is vice versa. The study provides a clearer picture of the result obtained from TGA and HHV which improvise the biomass into higher energy output.

scholarly journals Energy monitoring of a low temperature heating and cooling district network

2017 ◽  
Vol 122 ◽  
pp. 62-67 ◽  
Author(s):  
Nadège Vetterli ◽  
Matthias Sulzer ◽  
Urs-Peter Menti
Keyword(s):  
Low Temperature ◽  
Energy Monitoring ◽  
Heating And Cooling ◽  
Temperature Heating
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