The Experts below are selected from a list of 600 Experts worldwide ranked by ideXlab platform
Jinping Liu - One of the best experts on this subject based on the ideXlab platform.
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constitutive relationship of 4cr9si2 and technological parameters on the inner bore of cross wedge rolling for preform Hollow Valves
The International Journal of Advanced Manufacturing Technology, 2016Co-Authors: Jinping Liu, Baoyu Wang, Xuefeng Tang, Yuanming Huo, Jing ZhouAbstract:The hot deformation behavior of 4Cr9Si2 heat-resistant steel was investigated by hot deformation compression tests in the deformation temperature range of 950–1180 °C with strain rates of 0.1–10 s−1. The constitutive equation of 4Cr9Si2 heat-resistant steel was established to describe the peak stress as a function of the deformation temperature and strain rate. The deformation characteristics of the cross wedge rolling (CWR) process of preform Hollow Valves are analyzed. By using DEFORM-3D software for finite element simulation tools, the process of CWR forming Hollow Valves was analyzed. According to the finite element simulation results, which reveal the influence of different process parameters on the inner diameter of the Hollow Valve blank, changing the stretching angle of the die design method effectively improves the position wedge reaming of the workpiece.
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the process parameters effect of ovality in cross wedge rolling for Hollow Valve without mandril
MATEC Web of Conferences, 2016Co-Authors: Jinping Liu, Baoyu Wang, Jianguo Lin, Xuefeng TangAbstract:This paper presents the experimental and numerical results of the effect process parameters on ovality in cross wedge rolling (CWR) for Hollow engine Valve without mandrel. Numerical simulation model for ovality was established by means of the rigid-plastic finite element modeling (FEM) method for Hollow engine Valve. The experiments and numerical analyses suggest that the following parameters represent the best conditions for CWR of Hollow engine Valve: 30°-34° for the forming angle( α ), 5°-7° for the stretching angle( β ), 0.2-0.3mm for the mold void width( L ), and 65%-70% for the area reduction( Ψ ).
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Cross-wedge rolling of a 4Cr9Si2 Hollow Valve: explorative experiment and finite element simulation
The International Journal of Advanced Manufacturing Technology, 2015Co-Authors: Hongchao Ji, Jinping Liu, Baoyu Wang, Zhenhua Zheng, Jianghua Huang, Zhenghuan HuAbstract:Cross-wedge rolling (CWR) has many advantages in the production of shafts and rolling while a Hollow Valve is widely used in engine production. In this study, we use the CWR process to produce a Hollow Valve made of 4Cr9Si2 steel and present the experimental results. To evaluate the CWR process and deeply understand the deformation characteristics, a 3D finite element model (FEM) of the CWR process is established, and the mechanism of material flow, the temperature distribution, and the strain and rolling force are analyzed. The following conclusions are drawn based on the experiments and numerical simulations: changing the stretching angle (β) can effectively avoid swollen holes; the forming quality of the workpiece can be greatly improved when the forming angle (α) is equal to 35° and the stretching angle (β) is equal to 5° and 4° in the knifing and stretching zones, respectively; the CWR process is an effective technique to manufacture Hollow Valves for industrial production.
Baoyu Wang - One of the best experts on this subject based on the ideXlab platform.
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constitutive relationship of 4cr9si2 and technological parameters on the inner bore of cross wedge rolling for preform Hollow Valves
The International Journal of Advanced Manufacturing Technology, 2016Co-Authors: Jinping Liu, Baoyu Wang, Xuefeng Tang, Yuanming Huo, Jing ZhouAbstract:The hot deformation behavior of 4Cr9Si2 heat-resistant steel was investigated by hot deformation compression tests in the deformation temperature range of 950–1180 °C with strain rates of 0.1–10 s−1. The constitutive equation of 4Cr9Si2 heat-resistant steel was established to describe the peak stress as a function of the deformation temperature and strain rate. The deformation characteristics of the cross wedge rolling (CWR) process of preform Hollow Valves are analyzed. By using DEFORM-3D software for finite element simulation tools, the process of CWR forming Hollow Valves was analyzed. According to the finite element simulation results, which reveal the influence of different process parameters on the inner diameter of the Hollow Valve blank, changing the stretching angle of the die design method effectively improves the position wedge reaming of the workpiece.
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the process parameters effect of ovality in cross wedge rolling for Hollow Valve without mandril
MATEC Web of Conferences, 2016Co-Authors: Jinping Liu, Baoyu Wang, Jianguo Lin, Xuefeng TangAbstract:This paper presents the experimental and numerical results of the effect process parameters on ovality in cross wedge rolling (CWR) for Hollow engine Valve without mandrel. Numerical simulation model for ovality was established by means of the rigid-plastic finite element modeling (FEM) method for Hollow engine Valve. The experiments and numerical analyses suggest that the following parameters represent the best conditions for CWR of Hollow engine Valve: 30°-34° for the forming angle( α ), 5°-7° for the stretching angle( β ), 0.2-0.3mm for the mold void width( L ), and 65%-70% for the area reduction( Ψ ).
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Cross-wedge rolling of a 4Cr9Si2 Hollow Valve: explorative experiment and finite element simulation
The International Journal of Advanced Manufacturing Technology, 2015Co-Authors: Hongchao Ji, Jinping Liu, Baoyu Wang, Zhenhua Zheng, Jianghua Huang, Zhenghuan HuAbstract:Cross-wedge rolling (CWR) has many advantages in the production of shafts and rolling while a Hollow Valve is widely used in engine production. In this study, we use the CWR process to produce a Hollow Valve made of 4Cr9Si2 steel and present the experimental results. To evaluate the CWR process and deeply understand the deformation characteristics, a 3D finite element model (FEM) of the CWR process is established, and the mechanism of material flow, the temperature distribution, and the strain and rolling force are analyzed. The following conclusions are drawn based on the experiments and numerical simulations: changing the stretching angle (β) can effectively avoid swollen holes; the forming quality of the workpiece can be greatly improved when the forming angle (α) is equal to 35° and the stretching angle (β) is equal to 5° and 4° in the knifing and stretching zones, respectively; the CWR process is an effective technique to manufacture Hollow Valves for industrial production.
Xuefeng Tang - One of the best experts on this subject based on the ideXlab platform.
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constitutive relationship of 4cr9si2 and technological parameters on the inner bore of cross wedge rolling for preform Hollow Valves
The International Journal of Advanced Manufacturing Technology, 2016Co-Authors: Jinping Liu, Baoyu Wang, Xuefeng Tang, Yuanming Huo, Jing ZhouAbstract:The hot deformation behavior of 4Cr9Si2 heat-resistant steel was investigated by hot deformation compression tests in the deformation temperature range of 950–1180 °C with strain rates of 0.1–10 s−1. The constitutive equation of 4Cr9Si2 heat-resistant steel was established to describe the peak stress as a function of the deformation temperature and strain rate. The deformation characteristics of the cross wedge rolling (CWR) process of preform Hollow Valves are analyzed. By using DEFORM-3D software for finite element simulation tools, the process of CWR forming Hollow Valves was analyzed. According to the finite element simulation results, which reveal the influence of different process parameters on the inner diameter of the Hollow Valve blank, changing the stretching angle of the die design method effectively improves the position wedge reaming of the workpiece.
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the process parameters effect of ovality in cross wedge rolling for Hollow Valve without mandril
MATEC Web of Conferences, 2016Co-Authors: Jinping Liu, Baoyu Wang, Jianguo Lin, Xuefeng TangAbstract:This paper presents the experimental and numerical results of the effect process parameters on ovality in cross wedge rolling (CWR) for Hollow engine Valve without mandrel. Numerical simulation model for ovality was established by means of the rigid-plastic finite element modeling (FEM) method for Hollow engine Valve. The experiments and numerical analyses suggest that the following parameters represent the best conditions for CWR of Hollow engine Valve: 30°-34° for the forming angle( α ), 5°-7° for the stretching angle( β ), 0.2-0.3mm for the mold void width( L ), and 65%-70% for the area reduction( Ψ ).
Kumar A. Kranthi - One of the best experts on this subject based on the ideXlab platform.
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DESIGN OPTIMIZATION AND ANALYTICAL INVESTIGATIONS OF HALLOW EXHAUST ValveS IN I.C ENGINES
International Journal of Innovative Technology and Research, 2017Co-Authors: Srinivasulu, Dr. P., Babu, Mr. M. Ramesh, Kumar A. KranthiAbstract:An engine Valve is a mechanical device that regulates the supply of fuel to an engine. It is an important part of any engine system and comprised of a stem and a head. Exhaust Valve is precision engine components used to open to permit the burned gases to exhaust from cylinders . The heads of the Valves are subjected to the high temperature of the burning gases. The Exhaust Valves may reach a temperature of 800o cherry red. It is essential that they should not warp under the influence of the heat, and that their seats should not scale or corrode, as in either case they would become leaky. Therefore exhaust Valve are exposed to serve thermal loads and chemical corrosion. Exhaust Valve opens and closes as many as 2000 times per mile. In this thesis, various designs of Hollow exhaust Valves are modeled using CREO. The modeled Hollow Valve designs are 1) Straight Hollow portion from top of the stem to the bottom of it. 2) Two Hollow portions which are collinear to each other. 3) Two parallel Hollow portion with a beam at the center. The Hollow portion of the designs are filled with sodium. Each of the modeled design is analyzed by CFD software Fluent. It was found that the design 3 had better heat dissipation than other designs. The volume of sodium content affected the heat dissipation property and material surface affected the strength of the exhaust Valve. The alternate simple fabrication method is proposed to reduce the complexity of the fabrication metho
Jing Zhou - One of the best experts on this subject based on the ideXlab platform.
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constitutive relationship of 4cr9si2 and technological parameters on the inner bore of cross wedge rolling for preform Hollow Valves
The International Journal of Advanced Manufacturing Technology, 2016Co-Authors: Jinping Liu, Baoyu Wang, Xuefeng Tang, Yuanming Huo, Jing ZhouAbstract:The hot deformation behavior of 4Cr9Si2 heat-resistant steel was investigated by hot deformation compression tests in the deformation temperature range of 950–1180 °C with strain rates of 0.1–10 s−1. The constitutive equation of 4Cr9Si2 heat-resistant steel was established to describe the peak stress as a function of the deformation temperature and strain rate. The deformation characteristics of the cross wedge rolling (CWR) process of preform Hollow Valves are analyzed. By using DEFORM-3D software for finite element simulation tools, the process of CWR forming Hollow Valves was analyzed. According to the finite element simulation results, which reveal the influence of different process parameters on the inner diameter of the Hollow Valve blank, changing the stretching angle of the die design method effectively improves the position wedge reaming of the workpiece.