scholarly journals Multilayered-Sheet Hot Stamping and Application in Electric-Power-Fitting Products

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 215 ◽  
Author(s):  
Bin Zhu ◽  
Zhoujie Zhu ◽  
Yongmin Jin ◽  
Kai Wang ◽  
Yilin Wang ◽  
...  
Keyword(s):  
Contact Pressure ◽  
Load Capacity ◽  
Hot Stamping ◽  
High Strength ◽  
Optimal Number ◽  
Electrical Connection ◽  
Number Of Layers ◽  
Stamping Process ◽  
New Type ◽  
High Load Capacity

Traditional electric transmission line fittings, which are always manufactured from thick metal slabs, possess the disadvantage of heavy weight. In this study, a new type of electrical-connection-fitting, clevis-clevis component made of high-strength steel is developed to reduce weight, and a new hot-stamping process for multilayered sheets is proposed to manufacture the component efficiently. First, the structure of the new clevis-clevis component is designed, and the corresponding tool is developed. Second, a flat-tool heat transfer experiment is conducted. The influence of the number of layers and contact pressure on the cooling rate of each sheet is investigated. The optimizing number of layers and contact pressure for the multilayered-sheet, hot-stamping process are obtained. The optimal number of layers is two, and the optimal contact pressure is more than 20 MPa. The final microstructure of each sheet is fully martensitic, and the strength is about 1500 MPa. Finally, U-shaped, double-layer-sheet hot stamping is implemented to produce a typical electrical-connection-fitting, clevis-clevis component. The bearing capacity of a four-layered clevis-clevis is tested through numerical and experimental methods. The new connection-fitting clevis-clevis component exhibits a high load capacity of 280 kN. Compared with that of the traditional component, the weight of the new component is reduced by 60%.

scholarly journals Research on Lightweight Design and Indirect Hot Stamping Process of the New Ultra-High Strength Steel Seat Bracket

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 833 ◽  
Author(s):  
Tang ◽  
Gu ◽  
Jia ◽  
Li ◽  
Zhu ◽  
...  
Keyword(s):  
Topology Optimization ◽  
High Strength Steel ◽  
Lightweight Design ◽  
Hot Stamping ◽  
High Strength ◽  
Variable Density ◽  
Stamping Process ◽  
Electric Bus ◽  
Ultra High Strength Steel ◽  
New Type

Aiming at the need for lightweight requirements of the electric bus components, combined with the performance advantages of the hot stamping ultra-high strength steel, a new type of seat bracket structure is proposed. The new structure was analyzed by finite element method and the variable density topology optimization results. Subsequently, the new seat bracket was manufactured by the indirect hot stamping process. The results showed that the new type of seat bracket can reduce the weight by 17.04% after topology optimization, which achieved the goal of lightweight design of the structure. After indirect hot stamping, the bottom of the seat bracket microstructures were mainly martensite and the ultimate tensile strength was about 1560 MPa, the microhardness was equally distributed at about 513.5 HV. Finally, according to the stiffness check test, the seat bracket satisfied the user requirements.

scholarly journals Study on Phase Transformation in Hot Stamping Process of USIBOR® 1500 High-Strength Steel

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1119 ◽  
Author(s):  
Pengyun Zhang ◽  
Le Zhu ◽  
Chenyang Xi ◽  
Junting Luo
Keyword(s):  
Phase Transformation ◽  
High Strength Steel ◽  
Hot Stamping ◽  
High Strength ◽  
Transformation Kinetics ◽  
Martensite Content ◽  
Cct Curve ◽  
Stamping Process ◽  
Quenching Process ◽  
Kinetics Of

Based on the Kirkaldy-Venugopalan model, a theoretical model for the phase transformation of USIBOR® 1500 high strength steel was established, and a graph of the phase transformation kinetics of ferrite, pearlite, and bainite were plotted using the software MATLAB. Meanwhile, with the use of the software DYNAFORM, the thermal stamping process of an automobile collision avoidance beam was simulated. The phase transformation law of USIBOR® 1500 high-strength steel during hot stamping was studied through a simulation of the phase transformation during the pressure holding quenching process. In combination with the continuous cooling transformation (CCT) curve, the cooling rate of quenching must be greater than 27 °C/s to ensure maximum martensite content in the final parts, and the final martensite content increases as the initial temperature of the sheet rises.

Computer Simulation of Hot Stamping Process of DP Steel Car Bumper Chain Based on Dynaform

2012 ◽  
Vol 178-181 ◽  
pp. 2877-2880
Author(s):  
Han Wu Liu ◽  
Zhao Hui Liu ◽  
Hui Xiao Li ◽  
Shao Bo Ping
Keyword(s):  
Metal Forming ◽  
Steel Plate ◽  
Hot Stamping ◽  
High Strength ◽  
Spring Back ◽  
Temperature Field Distribution ◽  
Dp Steel ◽  
Performance Requirements ◽  
Stamping Process ◽  
Duplex Steel

Owing to the advantages of weight loss and security, duplex steel plate has been the priority for the saloon car body instead of ordinary one among a majority of engine factories. While there are undesirable phenomena because of its high strength at normal temperature, such as its formability is worsened dramatically, and failure and fracture always occur in the stamping. So hot stamping process must be adopted to make the formability available. Based on the Bumper chain of Beijing Hyundai Reina and taken DP600 high strength steel as research object, this paper analyzes the distributions of stress, strain and thickness changes during the process of sheet metal forming by using eta/DYNAFORM software, simulates the spring-back quantity after hot stamping forming, and the numerical simulation of the temperature field distribution with time during stamping process was done. The result shows that duplex steel plate can meet the performance requirements of automotive chain forming, which offers theory basis for the production of such parts.

Hybrid quenching method of hot stamping for automotive tubular beams

2015 ◽  
Vol 231 (9) ◽  
pp. 1599-1610 ◽  
Author(s):  
Jong-Kyu Park ◽  
Yang-Su Kim ◽  
Chang Hee Suh ◽  
Young-Suk Kim
Keyword(s):  
High Strength Steel ◽  
Hot Stamping ◽  
High Strength ◽  
Torsion Beam ◽  
Stamping Process ◽  
Die Quenching ◽  
Ultra High Strength Steel ◽  
Quenching Method ◽  
Torsion Beam Axle ◽  
Beam Axle

Recently, tubular-type coupled torsion beam axle, which is a component of the automotive rear suspension systems, has been developed by using ultra-high strength steel. It is manufactured by hot stamping process to enhance the strength and reduce springback. The hot stamping process is classified as a direct method and an indirect method according to forming sequence and quenching method, so-called die quenching or water quenching. Each of these methods has limitations in the aspect of dimensional accuracy and strength. Hybrid quenching is a new quenching method which sprays water to the tube directly in addition to die quenching. In this study, direct hot stamping with hybrid quenching was applied to produce an automotive tubular coupled torsion beam axle of ultra-high strength steel. This study proposes a simulation method of hybrid quenching for tubular beam and the hybrid quenching method was evaluated experimentally. Finally, the proposed hybrid quenching method has been found very effective in reducing the cooling time and thermal deformation.

Structure Analysis and Quality Prediction of DP Steel Engine Hood in the Process of Hot Stamping

2013 ◽  
Vol 791-793 ◽  
pp. 558-561
Author(s):  
Zhi Ping Zhang ◽  
Han Wu Liu ◽  
Tian Xiang Chen ◽  
Zhang Yi Yu
Keyword(s):  
Hot Stamping ◽  
High Strength Steels ◽  
High Strength ◽  
Forming Limit ◽  
Dp Steel ◽  
Performance Requirements ◽  
Stamping Process ◽  
Work Hardening Rate ◽  
Initial Work ◽  
Parts Manufacturing

Due to its good formability characteristics, such as high strength, high initial work hardening rate, as well as continuous yielding, thin-walled DP steel possesses great advantages of weight loss and security, and has been used to replace ordinary steel for automotive parts manufacturing by a lot of automotive industry. But along with the improvement of the performance of the strength, the high strength steels formability is worsened dramatically, and failure and fracture often occurs in its cold stamping process. So, hot stamping technology must be adopted to make the formability available. In the paper, it took the hot stamping process of DP steel engine hood for example and took DP800 as object of research. The forming limit, variation of major strain, minor strain and thickness, as well as the potential equality defects were analyzed by using eta/DYNAFORM software. The research results show that duplex steel plate can meet the performance requirements of car engine dumping plank forming, which offers theory basis for the production of similar parts.

Effect of Dies Temperature on Mechanical Properties of Hot Stamping Square-Cup Part for Ultra High Strength Steel

2010 ◽  
Vol 129-131 ◽  
pp. 390-394
Author(s):  
Cheng Xi Lei ◽  
Zhong Wen Xing ◽  
Hong Ya Fu
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Hot Stamping ◽  
High Strength ◽  
Hot Forming ◽  
Forming Process ◽  
Stamping Process ◽  
Ultra High Strength Steel ◽  
Mechanical Properties Testing ◽  
Simulation Results

The numerical simulation of hot-stamping process was carried out for UHSS square-cup parts, and the influence of dies temperature on the hot-stamping process was anlysised. Besides, through the microstructure analysis and mechanical properties testing of the formed parts, effects of dies temperature on microstructures and mechanical properties of hot-stamping square-cup parts were obtained. The experiment and simulation results showed that the mechanical properties of the UHSS are strongly dependent on the temperature, so the dies temperature is one of the most important parameters that have to be taken into account in designing the hot-forming dies and the hot-forming process.

Warm Stamping of the 3rd Generation Sheet Steel for Automobiles

2014 ◽  
Vol 1063 ◽  
pp. 219-222 ◽  
Author(s):  
Han Dong ◽  
Cun Yu Wang ◽  
Ying Chen ◽  
Wen Quan Cao
Keyword(s):  
Cooling System ◽  
Hot Stamping ◽  
Sheet Steel ◽  
Surface Oxidation ◽  
High Strength ◽  
Advantages And Disadvantages ◽  
Forming Technology ◽  
New Type ◽  
Automobile Parts ◽  
Hot Stamping Steel

The advantages and disadvantages of the conventional hot stamping steel and the hot tamping technology were shortly reviewed. It was proposed that new type steel with relative low austenization temperature and air hardening ability should be designed and produced to overcome the surface oxidation and avoid the complexity of cooling system of the stamping dies. In this study, it was shown that the 3rd generation sheet steel with medium-Mn composition could be austenized and pressed at 700-750°C and air cooled into automobile parts with strength no less than 1.5GPa and ductility larger than 12%. This new steel and corresponding forming technology were called warm stamping technology, which overcomes the disadvantages of the conventional hot stamping steel. The fabrication trials of the automobile parts in the automobile industries were demonstrated with high strength and relative good ductility. It was concluded that the 3rd generation sheet steel and the warm stamping technology could be applied to replace the conventional hot stamping steel and conventional hot stamping technology in near future.

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