Shear-Clinching of Multi-Element Specimens of Aluminium Alloy and Ultra-High-Strength Steel

2018 ◽  
Vol 767 ◽  
pp. 389-396 ◽  
Author(s):  
Daxin Han ◽  
Réjane Hörhold ◽  
Martin Müller ◽  
Sebastian Wiesenmayer ◽  
Marion Merklein ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Industrial Application ◽  
High Strength Steel ◽  
High Strength ◽  
Material Behaviour ◽  
Entire Sample ◽  
Forming Technology ◽  
Ultra High Strength Steel ◽  
Stage Process ◽  
Joining Process

The newly developed joining-by-forming technology “shear-clinching”, features a potentially single-stage process for joining UHSS without requiring any additional elements. Foundational studies have focused on the functionality of shear-clinching at a one-element sample. To ensure the safety of the industrial application of the shear-clinching technology, an investigation with component-like samples with several joints is required. This paper presents a detailed analysis of the material behaviour during the shear-clinching process with multi-element specimens to evaluate the influence of the neighbouring joints. In order to describe the influence of the neighbouring joints, the deformations resulting from the bending and material displacement are recorded without contact after the joining process: locally around the joining point and globally over the entire sample size. To minimize such bending effects, a tool-sided adaptation is provided. The results show the high potential of shear-clinching joining by UHSS and give further recommendations for future multi-material application.

Bend-Forming Technology for Ultra High Strength Steel Sheets

2012 ◽  
Author(s):  
Takayuki Futatsuka ◽  
Takeshi fujita ◽  
Yuji Yamasaki ◽  
Toru inazumi
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Steel Sheets ◽  
Forming Technology ◽  
Ultra High Strength Steel

scholarly journals Hemming with Pre-Bent Inner Sheet for Joining Ultra-High Strength Steel Sheets of Automobile Parts

2020 ◽  
Vol 4 (3) ◽  
pp. 77
Author(s):  
Yohei Abe ◽  
Wataru Ijichi ◽  
Ken-ichiro Mori ◽  
Kazuma Nakagawa
Keyword(s):  
High Strength Steel ◽  
Joint Strength ◽  
Welded Joint ◽  
High Strength ◽  
Peel Strength ◽  
Joint Work ◽  
Steel Sheets ◽  
Ultra High Strength Steel ◽  
Automobile Parts ◽  
Joining Process

In order to join two ultra-high strength steel sheets with low ductility for automobile parts, a joining process by hemming with a pre-bent inner sheet was developed. In this joining, the pre-bent inner sheet instead of the conventional flat inner sheet was used to relax the deformation concentration of the outer sheet. Although 780 MPa steel sheets were joined without the pre-bent inner sheet, a fracture in the outer sheet occurred in joining the 980 MPa sheets due to the low ductility of the sheets. The 980 MPa and 1180 MPa sheets were successfully joined by hemming with the pre-bent inner sheet. In this process, the deformation of the upper sheet was relaxed by contacting with the inner sheet, and then the strain on the outer surface reduced. Although softening around a weld nugget occurred by heating in the conventional welded joint, work-hardening occurred in the hemmed joint. The joint strength was investigated and then the peel strength of the hemmed sheets was about a half of the welded one. It was found that the hemming process with the pre-bent inner sheet was effective for joining ultra-high strength steel sheets with low ductility.

The Research and Development of Hot Stamping Forming Technology and Production Line in View of High Strength Steel Plate

2013 ◽  
Vol 422 ◽  
pp. 75-79 ◽  
Author(s):  
Li Bao ◽  
Hong Jun Zhang
Keyword(s):  
High Strength Steel ◽  
Steel Plate ◽  
Hot Stamping ◽  
High Strength ◽  
Present Situation ◽  
Advanced High Strength Steel ◽  
The Core ◽  
Forming Technology ◽  
Core Technology ◽  
Ultra High Strength Steel

Steel hot stamping is a kind of new forming technology that advanced high strength steel plate will be heated to austenitic temperature then stamping quickly, quenching in pressure stage through the mould and obtaining the cool speed required, thus obtaining the martensite which owns the intensity of around 1500 MPa of ultra high strength. Hot stamping technology of ultra high strength steel plate is one of the important ways which reduces body weight and improves shock resisitance and crashworthiness. Based on the analysis of hot stamping technology and the research present situation, comparing the key equipments and the core technology of the steel plate with each other. The key problem of high strength steel plate hot stamping area is discussed , present situation and the prospect is pointed out.

CRUCIBLE D6

Alloy Digest ◽  
1962 ◽  
Vol 11 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Low Temperature ◽  
High Strength Steel ◽  
High Strength ◽  
Heat Treating ◽  
Steel Company ◽  
Temperature Performance ◽  
Ultra High Strength Steel ◽  
Crucible Steel

Abstract Crucible D6 is a low alloy ultra-high strength steel developed for aircraft-missile applications and primarily designed for use in the 260,000-290,000 psi tensile strength range. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on low temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-129. Producer or source: Crucible Steel Company of America.

scholarly journals Mechanical clinching and self-pierce riveting for sheet combination of 780-MPa high-strength steel and aluminium alloy A5052 sheets and durability on salt spray test of joints

2021 ◽  
Vol 113 (1-2) ◽  
pp. 59-72
Author(s):  
Yohei Abe ◽  
Ken-ichiro Mori
Keyword(s):  
Aluminium Alloy ◽  
High Strength Steel ◽  
Salt Spray ◽  
High Strength ◽  
Alloy Sheet ◽  
Galvanized Steel ◽  
Load Reduction ◽  
Minimum Thickness ◽  
Steel Sheets ◽  
Mechanical Clinching

AbstractTo increase the usage of high-strength steel and aluminium alloy sheets for lightweight automobile body panels, the joinability of sheet combinations including a 780-MPa high-strength steel and an aluminium alloy A5052 sheets by mechanical clinching and self-pierce riveting was investigated for different tool shapes in an experiment. All the sheet combinations except for the two steel sheets by self-pierce riveting, i.e., the two steel sheets, the two aluminium alloy sheets, and the steel-aluminium alloy sheets, were successfully joined by both the joining methods without the gaps among the rivet and the sheets. Then, to show the durability of the joined sheets, the corrosion behaviour and the joint strength of the aged sheets by a salt spray test were measured. The corrosion and the load reduction of the clinched and the riveted two aluminium alloy sheets were little. The corrosion of the clinched two steel sheets without the galvanized layer progressed, and then the load after 1176 h decreased by 85%. In the clinched two galvanized steel sheets, the corrosion progress slowed down by 24%. In the clinched steel and aluminium alloy sheets, the thickness reduction occurred near the minimum thickness of the upper sheet and in the upper surface on the edge of the lower aluminium alloy sheet, whereas the top surface of the upper sheet and the upper surface of the lower sheet were mainly corroded in the riveted joint. The load reduction was caused by the two thickness reductions, i.e., the reduction in the minimum thickness of the upper sheet and the reduction in the flange of the aluminium alloy sheet. Although the load of the clinched steel without the galvanized coating layer and aluminium alloy sheets decreased by about 20%, the use of the galvanized steel sheet brought the decrease by about 11%. It was found that the use of the galvanized steel sheets is effective for the decrease of strength reduction due to corrosion.

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