Metal deforming – By use of tool acting during relative rotation between tool... – With cutting of work or product
Patent
1983-01-07
1984-12-25
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
With cutting of work or product
72108, B21H 100
Patent
active
044895810
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to metal working and, more particularly, to methods of manufacturing articles by deformation of cyclindrical blanks.
DESCRIPTION OF THE PRIOR ART
Known in the art is a method of manufacturing articles by deformation of cylindrical blanks (cf. a book "Poperechno-clinovaya prokatka" edited by E. M. Makushka, published by "Nauka i Tekhnika" Publishing House, Minsk, 1974, pp. 134-146), wherein cylindrical blanks chopped from the bar are heated and subjected to transverse wedge forming followed by deformation of end crops and their further separation from the formed articles.
This method makes it possible to manufacture only such articles which have the shape of the bodies of revolution and fails to be used for manufacturing the articles of other than mentioned above shape, for example, prismatic shape.
Also known in the art is a method of manufacturing articles by deformation of cylindrical blanks described in the GDR Pat. No. 74,762 published in 1970, and serving as a prototype of the present invention. This method comprises heating the blanks, their transverse wedge forming and flashless forging of the formed blanks, i.e. it allows making of articles of essentially any shape. End crops formed at the terminal parts of the blanks as a result of transverse wedge forming are deformed by shearing blades mounted on the forming machine, and since the shearing blades are mounted with a technological clearance to prevent their overlapping and damage when the operating height between the oppositely disposed forming tools is changed, necks are formed in the process of deformation of the end crops between said end crops and formed blanks, the thickness of the necks corresponding to said technological clearance between the shearing blades. In order to separate the end crops from the blanks it is necessary to break these necks down.
When the technological clearances are very small, e.g. of about 0.1 mm, and the operating edges of the shearing blades have not yet become blunt and are still sharp, these necks can probably be ruptured in the process of deformation of the end crops. However, when the technological clearances are comparatively large, e.g. of about 0.2 to 3 mm, and the operating edges of the shearing blades become blunt, strong necks are formed between the blanks and the end crops and a separate procedure performed outside the forming equipment, e.g. in ball mills, is required to break down said necks, repeat heating of the blanks being necessary for flashless forging following the separation procedure. All this considerably increases the expenditure and results in loss of production rate when manufacturing the articles.
SUMMARY OF THE INVENTION
The principal object of the present invention is to provide a method of manufacturing articles by deformation of cylindrical blanks which provides reliable separation of end crops from the formed blanks immediately after transverse wedge forming and does not require repeat heating of the blanks prior to flashless forging.
With this principal object in view, there is provided a method of manufacturing articles by deformation of cylindrical blanks, comprising the steps of heating the blanks, their transverse wedge forming followed by deformation of end crops by shearing blades, separating the end crops from the formed blanks and flashless forging of the formed blanks, wherein, according to the invention, the step of separatings of the end crops from the formed blanks is performed by reducing the speed of rotation of the end crops after deformation down to a value ranging from .omega./2.5 to zero, where .omega. is the speed of rotation of the blank during forming.
Due to reduction in the speed of rotation of the end crops, the necks formed between the end crops and the formed blanks are subjected to torque which causes shear deformations therein, the value of said shear deformations at the aforementioned relation of the speeds of rotation of the blanks and the end crops being enough to rupture the necks having the
REFERENCES:
"Cross Wedge Rolling", 1974, E. M. Makushok, pp. 134-146 with translation.
Davidovich Alexandr N.
Klushin Valery A.
Murashko Evgeny T.
Sadko Vladimir I.
Schukin Valery Y.
Fiziko-Tekhnichesky Institut Akademi Nauk Belorusskoi SSR
Larson Lowell A.
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