The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 1978
Filed:
Oct. 18, 1976
Alexandr Andreevich Shevchenko, Dnepropetrovsk, SU;
Gennady Ivanovich Gulyaev, Dnepropetrovsk, SU;
Igor Alexandrovich Chekmarev, Dnepropetrovsk, SU;
Petr Alexeevich Loskutov, Dnepropetrovsk, SU;
Vitaly Nikolaevich Cherny, Dnepropetrovsk, SU;
Valentin Nikolaevich Danchenko, Dnepropetrovsk, SU;
Valery Georgievich Balakin, Moscow, SU;
Evgeny Stepanovich Bondarenko, Elektrostal Moskovskoi oblasti, SU;
Vladimir Petrovich Bednyakov, Elektrostal Moskovskoi oblasti, SU;
Vladimir Mikhailovich Bokov, Noginsk Moskovskoi oblasti, SU;
Fedor Terentievich Vinogradov, Elektrostal Moskovskoi oblasti, SU;
Other;
Abstract
The invention relates to the manufacture of seamless tubes by the method of tube rolling. According to the method of the present invention a hollow blank is deformed with regard to its wall thickness, the deformation being alternated at least twice with a reduction of the diameter of the blank by means ofa mandrel with alternating groups of grooves for deformation and groups for reduction. The mandrel diameter at the portions corresponding to the groups of reduction grooves is smaller than the mandrel diameter at the preceding portions corresponding to the groups of grooves designed for deformation of the hollow blank to change the wall thickness thereof. During the continuous rolling, this enables subsequent levelling out of bulges at the tube ends in grooves on the mandrel during the deformation of the blank wall. As a result, the range of rolled tubes is considerably enlarged with an increased production of small-diameter thick-walled tubes and large-diameter thin-walled tubes without bulged ends.