Simulation of Induction Quenching on the Work Area of Reading Arm in Electronic Dobby Shedding Device

2013 ◽  
Vol 364 ◽  
pp. 478-482
Author(s):  
Zhi Long Li ◽  
Rong Fa Chen ◽  
Hua Feng Lu ◽  
Long Wu ◽  
Hua Yang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
High Speed ◽  
Treatment Process ◽  
Induction Hardening ◽  
Heat Treatment Process ◽  
Residual Stress Field ◽  
Hardening Process ◽  
Work Area ◽  
Thin Walled

Reading arm is a key component of the high-speed looms, thin-walled parts, 3mm thick, easy to be deformation during heat treatment.The hardness HRC60 of workeded area is required and uniform distribution.Temperature field of induction hardening process and distribution of residual stress field were simulated by ANSYS software.The decarburization of induction hardening region was also simulated by Deform software. Heat treatment process was optimized by the simulated results.

scholarly journals Manufacture of Toothed Elements in Nanoausferritic Ductile Iron

2014 ◽  
Vol 59 (3) ◽  
pp. 1217-1221 ◽  
Author(s):  
D. Myszka ◽  
E. Skołek ◽  
A. Wieczorek
Keyword(s):  
Heat Treatment ◽  
Ductile Iron ◽  
Treatment Process ◽  
Induction Hardening ◽  
Heat Treatment Process ◽  
Hardening Process ◽  
Long Time ◽  
New Material ◽  
Quality Of Products

Abstract The technology currently used for the fabrication of toothed wheels, gear couplings and chain drums involves the induction hardening process or hardening and tempering after carburising. All these processes take a long time and cause adverse changes in the dimensions and surface quality of products, requiring post-treatment machining to remove the resulting cavities. The paper proposes the implementation of gear elements made of ductile iron with nanoausferritic matrix obtained by a new appropriate heat treatment process. The new material offers good performance characteristics and nearly no need for the application of other technological processes commonly used in the manufacture of gears.

Numerical Simulation of Influences of Preheating and Postweld Heat Treatment in Welding

2012 ◽  
Vol 538-541 ◽  
pp. 1518-1521
Author(s):  
Qing Yang ◽  
Shu Jun Xie ◽  
Tian Bao Yu
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Stress Distribution ◽  
Treatment Process ◽  
Postweld Heat Treatment ◽  
Element Model ◽  
Residual Stress Field ◽  
Pipe Welding ◽  
Postweld Heat ◽  
The Finite Element Model

In this paper, to investigative effects of preheating and postweld heat treatment on residual stress field in Q345 steel pipe welding, the finite element model was established. Preheating processes and postweld heat treatment process were simulated respectively. The results show that preheating can homogenize residual stress distribution of the weldment and decrease the residual stress. The heat treatment reduces the residual stress in inner and outer walls by 40% and 60% respectively and the stress distribution is more even and the stress concentration is reduced.

Computer Simulation of Heat Treatment Process for 125MN Plunger

2008 ◽  
Vol 575-578 ◽  
pp. 1129-1133
Author(s):  
Chun Li Mo ◽  
Jin Ling ◽  
Yi Kun Luan ◽  
Cai Ping Shen
Keyword(s):  
Heat Transfer ◽  
Heat Treatment ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Real Time ◽  
High Speed ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Warm Up ◽  
Holding Period

The heavy 125MN Plunger is weight 140 ton, its heat treatment process include two part, one is heat and another is quenching in order to attain certain hardness on its surface and toughness on its body. Differential temperature heat process were made in well resistance furnace, the heat time include warm-up and holding period and high-speed increasing period. The total time is about 30-40 hours.The differential heat treatment process is an essential step in the production of heavy plunger, and it determines the hardness distribution on the sample surface. In this paper, a program to calculate real-time temperature during the heat treatment process was developed based on a great deal of experiments. Using this subroutine program the temperature field of hollow heavy plunger during differential heat treatment process was calculated. The result shows that the simulated temperature was agreed with the real temperature in the warm-up and holding period of the heat treatment process. In the calculation temperature field ,based on the convectional heat transfer coefficient and radiate heat transfer coefficient, the corrected heat transfer coefficient were induced to compose comprehensive heat transfer coefficient. The temperature predicted in warm-up and holding period were correct, the error was below 1%. At the high-speed increasing period, the time when the external temperature reach enacting was predict accurately. So the computer simulation can give real time prediction to decide parameters of the heat treatment process. The result also show that the program developed is sample and applied , it fit for predicting temperature at workshop real time and it is available to deal with complex process .

Study on Improving Cutting Tools Lifespan of W6Mo5Cr4V2 High-Speed Steel

2010 ◽  
Vol 139-141 ◽  
pp. 344-347
Author(s):  
Guang Ming Li ◽  
Li Yan ◽  
Shu Min Yu
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
High Speed ◽  
Treatment Process ◽  
Cutting Tools ◽  
High Speed Steel ◽  
Heat Treatment Process ◽  
Waste Energy ◽  
New Treatment ◽  
Steel Heat

This paper mainly discusses the technique of using quenching at 1000°C and tempering at 650°C for 2 hours to replace the heat treatment process of quenching at 1225°C and tempering at 560°C for 1 hour for three times.Due to the old heat treatment process is traditional multifarious waste energy and relatively backward.The experiment results prove that after the new treatment using the W6Mo5Cr4V2 high-speed steel to make cutting tools such as cutters, drill, taps and so on. It aslo achieves better abrasion resistance and ductility. This meeting the objective of improving the wear resistance, toughness, lifespan enhancement and energy conservation.It opens up a new way of simple and energy saving for W6Mo5Cr4V2 high-speed steel heat treatment process.The material of W6Mo5Cr4V2 high-speed steel has certain value to research.

Stress Measurement in Carbon Steel by Magnetic Barkhausen Noise Technique

2017 ◽  
Vol 751 ◽  
pp. 213-218
Author(s):  
Mai Noipitak
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Carbon Steel ◽  
Tensile Stress ◽  
Treatment Process ◽  
Stress Measurement ◽  
Barkhausen Noise ◽  
Heat Treatment Process ◽  
Magnetic Barkhausen Noise ◽  
The Relationship

The Magnetic Barkhausen Noise (MBN) technique can evaluate the residual stresses in carbon steel and provide information about the relationship between residual stress level and MBN signal. This research work is based on the analysis of MBN signals obtained from carbon steel samples. ASTM A36 and A516 carbon steel were used to vary the residual stress by heat treatment process with 5 conditions: annealing, normalizing, quenching in oil, quenching in water and quenching in salt water. The microstructure and hardness of samples also were varied by these heat treatment processes. Twelve samples (including base materials) were cut to analyze the microstructure and hardness by the microscope and hardness testing machine. Reference materials from each condition were established to represent the MBN signals. The MBN technique was used to evaluate the residual stresses from heat treatment process on each reference material. Then each sample was prepared to tensile specimen. All specimens were applied static tension load below yield point. The load was increased at 25 N/mm2 (MPa) in increment. Each tensile stress level was measurement by MBN technique at 0 and 90 degree of direction of tension axis. The experimental results found that the MBN signal amplitude changed as the condition of heat treatment changed and the relationship between tensile stress and MBN signal showed linear correlation. This research is useful to understand and guide for establishing the reference materials for residual stress measurement by MBN technique.

Influence of Transformation Plasticity on Residual Stresses and Distortions due to the Heat Treatment of Steels with Different Carbon Content

2005 ◽  
Vol 490-491 ◽  
pp. 47-52 ◽  
Author(s):  
Clemens Franz ◽  
Gerhard Besserdich ◽  
Volker Schulze ◽  
Hermann Müller ◽  
Detlef Löhe
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Residual Stresses ◽  
Treatment Process ◽  
Residual Stress Distribution ◽  
Heat Treatment Process ◽  
Temporal Development ◽  
Transformation Plasticity ◽  
Initial State ◽  
Simulation Tools

The field of heat treatment of steels offers a large variety of applications for the use of simulation tools. It always includes the development of residual stresses and distortions. The geometry of the part, the composition of the material, the heat treatment process as well as the initial state of the part interact with each other in complex ways and have an influence on the distortion of the part. Using simulation the temporal development of temperature, phases, stresses and distortions while quenching as well as the residual stress distribution and distortion after quenching can be calculated. Transformation plasticity has been proved to be very important for heat treatment simulation. Three steels with identical contents of alloying elements but different carbon contents of 0.2, 0.5 and 0.8 wt. % were analysed. The influence of transformation plasticity during the martensitic transformation on the distortions and residual stresses after quenching of cylinders made out of the three steels was analyzed in simulations and compared to experimental results.

Simulation and Analysis of Residual Stress and Microstructure Transformation for Post Weld Heat Treatment of a Welded Pipe

2014 ◽  
Vol 136 (2) ◽  
Author(s):  
Yi Han ◽  
Enlin Yu ◽  
Daochen Huang ◽  
Liang Zhang
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Quantitative Analysis Method ◽  
On Line ◽  
Von Mises ◽  
Welded Pipe ◽  
Von Mises Stresses ◽  
Selection Of

With the characteristics of the sandglass-shaped temperature field generated during welding of high-frequency induction longitudinally welded pipe taken into consideration, this paper focuses on the rules of influence of a post weld medium-frequency heat treatment process on microstructural change and the rules of residual stress distribution, and proposes a quantitative analysis method for studies on heating mechanisms of on-line heat treatment. The microstructural evolution process respect to time, and the rules of post weld axial, circumferential, radial, and residual von Mises stresses changing by path were quantitatively analyzed, respectively. It was found from comparison between a metallographic test and a microhardness test that on-line heat treatment is significantly effective in improving microstructures and reducing residual stress of the outer surface of a welded pipe. By controlling the distribution types of the microstructural field and the stress field through appropriate selection of heat treatment process parameters and distributing heat more reasonable heat distribution, it is expected that the residual stress of the inner surface of a welded pipe can be further reduced and the quality and efficiency of on-line heat treatment can be improved.

scholarly journals Cryogenic Hardening of EN 19 Alloy Steel

2019 ◽  
Vol 8 (10) ◽  
pp. 158-161
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Treatment Process ◽  
Cryogenic Treatment ◽  
Heat Treatment Process ◽  
Wear Protection ◽  
Hardening Process ◽  
Alloy Steels ◽  
Increase Wear Resistance ◽  
The Impact

This paper includes the study of heat treatment process that we carried out on En 19 steel in cryogenic atmosphere. Cryogenic treatments of alloy steels have been significantly increase wear resistance and toughness. These investigations of warmth treatment cryogenic medicines of amalgam steels have been asserted to altogether expand wear protection and sturdiness. Cryogenic handling is a supplementary procedure to customary warmth treatment process in steels. The cryogenic treatment on apparatus materials builds the life of instruments, gear, parts and materials by boosting elasticity, sturdiness and strength. This cryogenic hardening process is an onetime treatment influencing the whole part — not only the surface. Cryogenic treatment has been broadly embraced as a cost decrease and execution upgrading innovation. Cryogenic treatment is likewise utilized as an empowering innovation, when its pressure alleviating benefits are used to allow the manufacture (or machining) of basic resistance parts. With regards to great outcomes about the use of profound cryogenic treatment (DCT) on materials, the impact on the microstructure and properties (hardness, strength and the substance of held austenite) are observed to be made strides. Cryogenic treatment has been distinguished to improve the properties of Tools steels. It is discovered that cryogenic treatment confers almost 110% change in apparatus life.

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