586 patents
Page 30 of 30
Utility
Blank shape determining method, blank, press formed product, press forming method, computer program, and recording medium
14 Oct 19
A blank shape determining method includes: a process of making a forming analysis of forming a reference blank into a reference formed product and a acquiring sheet thickness distribution and a plastic strain distribution; a process of acquiring a forming failure evaluation index for the reference blank; a process of estimating a region, which includes an end edge portion at which the forming failure evaluation index exceeds a predetermined threshold, within the reference blank as a forming failure region; a process of generating a plurality of corrected blanks; a process of making a forming analysis of forming the corrected blanks into corrected formed products and acquiring a sheet thickness distribution and a plastic strain distribution; a process of acquiring the forming failure evaluation index for the corrected formed product; and a process of determining a shape of the corrected blank having a smallest maximum value of the forming failure evaluation index as a shape of a blank provided for press forming.
Shigeru Yonemura, Tohru Yoshida, Jun Nitta, Toshiyuki Niwa
Filed: 23 Mar 16
Utility
Grain-oriented electrical steel sheet
7 Oct 19
Hideyuki Hamamura, Tatsuhiko Sakai, Fumiaki Takahashi, Hisashi Mogi, Shunsuke Okumura, Hirofumi Imai
Filed: 18 Apr 16
Utility
Joining structure
7 Oct 19
A joining structure of the invention includes a first metal sheet and a pair of second metal sheets.
Kenichiro Otsuka, Yoshiaki Nakazawa, Ryuichi Nishimura, Masanori Yasuyama
Filed: 27 Aug 15
Utility
Heat-treated steel material and method of manufacturing the same
7 Oct 19
A heat-treated steel material includes: a chemical composition expressed by, in mass %: C: 0.16% to 0.38%; Mn: 0.6% to 1.5%; Cr: 0.4% to 2.0%; Ti: 0.01% to 0.10%; B: 0.001% to 0.010%; Si: 0.20% or less; P: 0.05% or less; S: 0.05% or less; N: 0.01% or less; Ni: 0% to 2.0%; Cu: 0% to 1.0%; Mo: 0% to 1.0%; V: 0% to 1.0%; Al: 0% to 1.0%; Nb: 0% to 1.0%; REM: 0% to 0.1%; and the balance: Fe and impurities; and a structure expressed by: retained austenite: 1.5 volume % or less; and the balance: martensite.
Shinichiro Tabata, Kazuo Hikida, Nobusato Kojima, Naomitsu Mizui
Filed: 5 Jun 14
Utility
Wire rod for high strength steel cord
7 Oct 19
A wire rod for a steel cord has a wire diameter R of 3.5 mm to 8.0 mm, and includes, in a chemical composition, by mass %: C: 0.70% to 1.20%; Si: 0.15% to 0.60%; Mn: 0.10% to 1.00%; N: 0.0010% to 0.0050%; Al: more than 0% and 0.0100% or less; and a remainder of Fe and impurities, in which a surface part and a central part are included, a thickness of the surface part is 50 μm to 0.20×R, the central part includes a pearlite structure in a proportion of 95% to 100% by area %, a C content of the surface part is 40% to 95% of a C content of the central part, and a ratio of a thickness of a lamellar cementite at a center of the thickness of the surface part to a thickness of a lamellar cementite in the central part is 95% or less, whereby high strength and workability can be achieved even after a finish drawing process and cracking or the like caused by a delamination phenomenon can be prevented.
Daisuke Hirakami, Makoto Okonogi
Filed: 22 Apr 15
Utility
Steel sheet
7 Oct 19
A steel sheet includes: a base iron; a scale of 10.0 μm or less in thickness on a surface of the base iron; a subscale between the base iron and the scale.
Yoshinari Ishida, Riki Okamoto, Daisuke Maeda
Filed: 27 Mar 16