Effect of Tool Shape on Galling Behavior in Plate Shearing

2013 ◽  
Vol 853 ◽  
pp. 460-465
Author(s):  
Tomohiro Yamada ◽  
Zhi Gang Wang ◽  
Takuya Fukao
Keyword(s):  
Tensile Strength ◽  
Steel Plate ◽  
Lower Surface ◽  
Expansion Ratio ◽  
High Ratio ◽  
High Tensile Strength ◽  
Edge Angle ◽  
Tool Shape ◽  
Surface Expansion ◽  
Clean Metal

Finish blanking is one of the precision shearing processes and it has some features such as the formability of a high ratio of the burnished surface, lower surface expansion ratio of the burnished surface. The purpose of the present work is to clarify the effect of the tool shape in finish blanking on galling behavior. A high-tensile-strength-steel plate with a thickness of 6mm is used in the present paper. The edge shape of punch is changed while the clearance is kept to 12%t. Galling is observed except for the PW punch with the edge angle of 30 degrees at the first shearing operation. In the case of the PW punch with the edge angle of 30 degrees, galling cant be found clearly even when the shearing number increases until 20. The burnished surface has a glossy part with the clean metal for the punches except for the PW punch with the edge angle of 30 degree. It is found that the glossy part is generated after fracture occurs at the punch edge and then causes galling.

Effect of Edge Shape of Tool in Finish Blanking

2014 ◽  
Vol 939 ◽  
pp. 253-259
Author(s):  
Tomohiro Yamada ◽  
Zhi Gang Wang ◽  
Takuya Fukao
Keyword(s):  
Tensile Strength ◽  
Process Parameters ◽  
Steel Plate ◽  
Experimental Results ◽  
High Tensile Strength ◽  
Limited Effect ◽  
Edge Angle ◽  
Small Clearance ◽  
Tool Shape

In the present paper, the finish-blanking method is taken up because it is an easy-to-use method by using a tool with rounded edge and a small clearance between the punch and die. In finish blanking, the process parameters such as the tool shape and clearance are significant. The purpose of the present work is to clarify the effect of tool shape of PW punch in finish blanking. In the present paper, a high-tensile-strength-steel plate with a thickness of 6mm was used. The edge shape of punch was changed, and the clearance was changed within the range of 0.65%t - 12%t. The experimental results show that the edge angle of PW punch should be in the range of 30° - 60°, and the clearance should be less than 2.0%t to obtain the ratio of the burnished surface more than 80%. The edge shape of the punch has a very limited effect on the shear droop, when the clearance is less than 2.0%t. It was also found that the PW punch is more suitable to control the burr depth than Rounded punch.

Mechanism of Galling Generation Using TiCN Coating in Finish Blanking - Thermochemical Simulation and Elemental Analysis -

2019 ◽  
Vol 794 ◽  
pp. 333-339
Author(s):  
Tomohiro Yamada
Keyword(s):  
Oxide Scale ◽  
Equilibrium Problems ◽  
Steel Plate ◽  
Expansion Ratio ◽  
Surface Flow ◽  
High Tensile Strength ◽  
Electron Probe Micro Analyzer ◽  
Commercial Code ◽  
Ticn Coating ◽  
Surface Expansion

The mechanism of galling generation is studied with finish blanking using TiCN coated punch. A high-tensile-strength-steel plate with a thickness of 6mm is used in the present paper. The edge shapes of punch are two types, a punch with 1.0 mm chamfered edge (C1.0 punch) and a punch with right angle edge (RA punch). The clearance is kept to 0.5%t, and lubrication is not used in this experiment. Galling is observed at the first shearing operation except for RA punch, and galling can’t be found clearly even when the shearing number reaches 20 in the case of the RA punch. In order to clarify these differences of RA punch and C1.0 punch, the oxygen on burnished depth is observed by electron probe micro analyzer (EPMA). The oxygen is not detected on the burnished depth sheared by RA punch. On the other hand, the oxygen is detected on the burnished depth sheared by C1.0 punch. In the case of C1.0 punch, the oxide scale on the plate surface flow into the burnished depth because of the low surface expansion ratio of the burnish depth. Thermochemical simulation is carried out using a commercial code MALT and gem which solves chemical equilibrium problems by minimizing the gibbs energy of the system. TiCN reacts with oxide scale to form Fe and Fe4N. As result of analyzing galling part of C1.0 punch from the cross section direction, Fe, Fe4N, FeTiO3 and Fe2TiO4 are detected and those detected elements coincides well with the Thermochemical simulation.

Full penetration welding of thick high tensile strength steel plate with high-power disk laser in low vacuum

2018 ◽  
Vol 32 (5) ◽  
pp. 289-302
Author(s):  
Seiji Katayama ◽  
Ryouji Ido ◽  
Koji Nishimoto ◽  
Masami Mizutani ◽  
Yousuke Mizutani
Keyword(s):  
Tensile Strength ◽  
High Power ◽  
Steel Plate ◽  
High Tensile Strength ◽  
Disk Laser ◽  
Full Penetration

scholarly journals Evaluation of the Form-Forming Mechanism for High-Tensile-Strength Steel Plate

2017 ◽  
Vol 58 (12) ◽  
pp. 1708-1714 ◽  
Author(s):  
Kouji Kanno ◽  
Souichiro Nishino ◽  
Kunio Ohya
Keyword(s):  
Tensile Strength ◽  
Steel Plate ◽  
High Tensile Strength ◽  
Forming Mechanism

scholarly journals Improvement in Impact Properties of 80kg/mm2 Grade High Tensile Strength Steel Plate

1980 ◽  
Vol 66 (2) ◽  
pp. 253-262
Author(s):  
Seiichi WATANABE ◽  
Hiroo OHTANI ◽  
Kazuo SAKAI ◽  
Hiromi UCHIMURA
Keyword(s):  
Tensile Strength ◽  
Steel Plate ◽  
High Tensile Strength ◽  
Impact Properties

Improvement in Punching Properties of High Tensile Strength Steel Sheet by Heat-Treatments for Reduction of Center Segregation

2014 ◽  
Vol 622-623 ◽  
pp. 1075-1080 ◽  
Author(s):  
Kota Sakumoto ◽  
Kazuhiko Yamazaki ◽  
Takashi Kobayashi ◽  
Shinsuke Suzuki
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Crack Formation ◽  
Expansion Ratio ◽  
High Tensile Strength ◽  
Burr Height ◽  
Hole Expansion ◽  
Steel Sheets ◽  
Heat Treated ◽  
Hole Expansion Ratio

We investigated punching properties (crack in punched surface and hole expansion ratio) of high tensile strength steel sheets with and without center segregation. High strength steel sheets were heat-treated to reduce center segregation. Tensile strength, shear surface ratio, depth of rollover and burr height were measured on heat-treated steel sheets to confirm the effect of heat-treatment on strength. The EPMA analysis showed that the center segregation of Mn was reduced by the diffusion during heat-treatment. Crack-formation frequency and hole expansion ratio were also measured. As a result, the center segregation of Mn in high tensile strength steel sheets decreased by the heat-treatment (600 oC for 100 h) with maintaining the tensile strength, the depth of rollover and the burr height. The crack-formation frequency of the steel sheets decreased through heat-treatments.

Effect of Mn content on corrosion characteristics of lean Mn TWIP steel

2018 ◽  
Vol 32 (19) ◽  
pp. 1840083 ◽  
Author(s):  
K. M. Moon ◽  
D. A. Kim ◽  
Y. H. Kim ◽  
M. H. Lee
Keyword(s):  
Tensile Strength ◽  
Oxide Film ◽  
Electrochemical Method ◽  
Steel Plate ◽  
Twip Steel ◽  
Manganese Content ◽  
The Body ◽  
High Tensile Strength ◽  
Corrosion Properties ◽  
Mn Content

It is important that the steel plate is manufactured with a high tensile strength to reduce the weight of the body. It is generally accepted that twinning induced plasticity (TWIP) steel is a special steel with not only a high ductility but also a high-tensile strength compared to general steel. While numerous investigations have been carried out on the TWIP steel with an amount of manganese of at least 20%, the investigation of steel with manganese content of less than 20% has seldom been considered until now. In this study, the TWIP steel with manganese of less than 20% (12Mn, 15Mn and 18Mn TWIP steel) was investigated to determine the corrosion properties using electrochemical method. The 18Mn and 12Mn samples exhibited the best and worst corrosion resistance, respectively. It is suggested that the 18Mn sample forms a stable oxide film on the surface because it contains a larger amount of manganese and aluminum compared to the other samples, and their composition enables the easy formation of the oxide film.

scholarly journals Development of Welding Wire for 690MPa High Tensile Strength Steel Plate.

DENKI-SEIKO ◽  
1996 ◽  
Vol 67 (3) ◽  
pp. 179-185
Author(s):  
Masaru Takenouchi ◽  
Ikuo Nagami ◽  
Takao Shimizu ◽  
Atsushi Kondo ◽  
Yoshiichi Tokuwa
Keyword(s):  
Tensile Strength ◽  
Steel Plate ◽  
High Tensile Strength ◽  
Welding Wire
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