Nisshin Steel Co., Ltd.

Kenji Hara

Yoshinori Matsumoto

Kouki Tomimura

Jun Kurobe

Akihiro Ando

Kazuhiro Takagi

Toshiro Yamada

Katsuhide Nishio

Masahito Sakaki

Kazushi Sakamoto

Shinobu Karino

Yoshiyuki Umakoshi

Masayuki Ishihara

Atsushi Aizawa

A spinning method for forming pipe bodies of varying diameter. In the spinning method, when a necked portion is formed at the end of the pipe material by the spinning method, working rollers are restricted so as to return immediately before the pipe end instead of being allowed to axially move beyond the end of the working object pipe. The amount of diameter reduction at the pipe end is set to be smaller than that of the most diameter reduced portion connecting to the pipe end. A protruding portion of a so-called bellmouth shape is formed at the working end, thereby preventing generation of fractures originating at the working end of the base portion or the welded portion and generation of wrinkles during the spinning process.

Spinning method for forming pipe end

When a metastable austenitic stainless steel strip with a value Md(N), which is calculated from a composition, of 20&#x2013;100 is ring-rolled to a steel belt, the relationship of &#x2212;0.3913T+0.5650Md(N)+60.46&#x3b5;&#x2267;65.87 is established among a material temperature T, an equivalent strain &#x3b5; and the value Md(N). Due to the controlled rolling, a stainless steel belt for a continuously variable transmission is bestowed with fatigue properties similar or superior to those of a 18%-Ni maraging steel belt. The value Md(N) is defined by the equation of Md(N)=580&#x2212;520C&#x2212;2Si&#x2212;16Mn&#x2212;16Cr&#x2212;23Ni&#x2212;300N&#x2212;10Mo, and the equivalent strain &#x3b5; is defined by the equation of &#x3b5;=&#x221a;{square root over (4(1n(1&#x2212;R))/3)} (R: reduction). Furthermore, the steel belt is stabilized in its quality and profile by confining a variation &#x394;T of the material temperature T within a range of &#xb1;6.4&#xb0; C.

Production method of belt for stainless steel continuously variable transmission belt

A method for making sectionally deformed band plate feeds by cold-rolling metal band plate feeds between work rolls wherein at least one of the work rolls has a barrel provided with a circumferential groove, a plurality of metal band plate feeds with substantially equal resistance to deformation, while overlaid one upon another, are rolled together between the work rolls to a reduction ratio of 30% or lower at one feeding operation, and the resulting metal band plate feeds are separated from each other.

Method for making band plates deformed in section

A plurality of thermocouples are embedded close to each other with individually different depth in a temperature detecting block. One or more of the temperature detecting block are attached to the surface of a thermal sensor roll. When the thermal sensor roll is held in contact with a metal strip being rolled, temperatures in the thermal sensor roll are measured at a plurality of points. The temperature of the metal strip in contact with the surface of the thermal sensor roll is calculated from the graduation of a temperature in the thermal sensor roll along a direction vertical to the surface of the thermal sensor roll, without the influence of disturbances. The obtained temperature value of the metal strip being rolled is compared with an experimentally obtained temperature of heat streak formation, to predict the formation of heat streaks with high accuracy.

Prediction method for formation of heat streak and thermal sensor roll

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Hyogo, Japan

Kenji Hara