Method for producing forgings mainly made of metals and...

B - Operations – Transporting – 21 – J

Patent

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Details

B21J 1/04 (2006.01) B21J 5/00 (2006.01) B21J 7/14 (2006.01) B21J 13/02 (2006.01) B21J 13/10 (2006.01)

Patent

CA 2449107

The invention relates to metal-forming process. The inventive method for producing forging consists in heating a billet and forging said billet with the aid of a press provided with two manipulators in several passes by four- side reduction in four-headed forging devices associated with macro-shears of metal in a transversal direction with respect to the plane of the billet. Forging is carried out within an acceptable temperature range in two stages i.e. a rough forging is carried out in the first stage, at the second stage, a final forging is carried out by enclosing from 40 to 100 % of the perimeter of the cross-section of the billet by each pair of the working surfaces of the heads for each single reduction. The inventive forging system comprises a forging press provided with top and bottom plates which have locks for arranging and fixing forging tools, a movable tool table for positioning changeable forging tools thereon which are embodied in the form of two or more four-headed forging devices and one or two manipulators. One or more four- headed forging devices for rough forging and one four-headed forging device for final forging are disposed on the positions of the tool table. The free space between the heads of the final forging device within the cross section thereof, when the heads are in the closed position, is selected such that it is 1.1-1.4 times less than the free space between the heads of the rough forging device. The working surface of each head of the rough forging device is embodied in the form of a plane parallel to the reference plane of the head, and two lateral planes adjacent thereto and arranged on two sides thereof at an angle of 135-170~.

L'invention appartient au domaine de traitement des métaux sous pression. Le procédé de fabrication de pièces forgées consiste à réchauffer un lingot puis à le forger au moyen d'une presse, munie de deux manipulateurs, en plusieurs passages par le pressage des quatre côtés dans des dispositifs de forgeage à quatre têtes, avec des macrodécalages des métaux dans le plan transversal de l'ébauche. Le forgeage est effectué dans un intervalle de températures admissible, en deux stades: on procède d'abord au forgeage préliminaire puis au forgeage de calibrage, le périmètre de la section transversale de l'ébauche étant recouvert à 40-100 % par chaque paire de zones de travail à chaque opération de pressage. Le système de forgeage comprend une presse de forgeage avec des plaques supérieure et inférieure comportant des verrous de montage et de fixation de l'outil de forgeage, une table d'instruments mobile destinée au positionnement des instruments de forgeage amovibles se présentant comme deux ou plusieurs dispositifs de forgeage à quatre têtes ainsi qu'un ou deux manipulateurs. On a disposé dans les positions de la table d'instruments un ou plusieurs dispositifs de forgeage à quatre têtes, destinés au forgeage préliminaire, et un dispositif destiné au forgeage de calibrage. La surface de l'espace libre entre les têtes dans la section transversale est, en position fermée des têtes, de 1,1 à 1,4 fois inférieure à la surface de l'espace libre en position ouverte. La surface de travail de chaque tête dans le dispositif de forgeage préliminaire se présente comme un plan parallèle à la surface d'appui de la tête et deux plans latéraux qui lui sont adjacentes sous un angle de 135-170·.

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