Method and device for producing a hollow metallic billet from a metallic billet
a technology of metallic billets and hollow metallic billets, which is applied in the direction of work cooling devices, metal rolling arrangements, metal-working apparatuses, etc., can solve the problems of insufficient effectiveness, large portion of the tube concerned, and insufficient cost,
Inactive Publication Date: 2014-02-06
BENTELER STEEL TUBE
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- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The invention is about adjusting the stability of a metal billet to guide the progress and orientation of a piercing tool during the piercing process. The technical effect is improved precision and efficiency in the piercing process.
Problems solved by technology
These measures are for the most part elaborate, cost-intensive and, in many cases, not sufficiently effective.
Excessive eccentricity values in the tube can, in the extreme case, lead to rejection of a large portion of the tube concerned, or even of the entire tube.
Method used
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Embodiment Construction
[0095]FIG. 1 shows an embodiment of the device according to the invention for carrying out an embodiment of the method according to the invention. In this case, the billet 1, which in the embodiment shown is a round billet, is held on a holder (not shown), and can by means of this holder be set in rotation about the central axis M. The direction of rotation is indicated in FIG. 1 by the arrow labeled ROT.
[0096]An embodiment of the holder that can be used to hold the billet 1 is illustrated schematically in two views in FIG. 4. As can be seen from this FIG. 4, in the embodiment shown the holder 3 consists of a set of three rolls 30. In the illustrated embodiment, one roll 30 is a drive roll 300 and two other rolls 30 are guide rolls 301. The billet 1 thus is driven by the drive roll 300, whose axis of rotation or central axis MR is parallel to the central axis M of the billet 1, and is guided in its rotational movement by the guide rolls 301, whose center axes MR are also parallel to...
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Abstract
The present invention is directed to a method for producing a hollow metallic billet (10) from a heated metallic billet (1) by a piercing operation (for example with the use of a piercing mandrel (4)). The method is characterized in that a local temperature change is effected at least at the hole initiation end (11) of the billet (1) in at least one zone (110, 112) and the zone is rotationally symmetrical to the central axis (M) of the billet (1). Also described is a device for producing a hollow metallic billet (10) from a metallic billet (1) and comprising a holder (3) for the billet (1), characterized in that the device includes at least one temperature adjusting device or a projection element (2) operative to change the temperature of the billet (1) in the holder (3) at least zonewise and directed at a subzone of at least one of the end sides of the billet (1).
Description
REFERENCE TO PENDING PRIOR PATENT APPLICATION [0001]This patent application claims benefit of German Patent Application No. 10 2012 107 041.5, filed Aug. 1, 2012, which patent application is hereby incorporated herein by reference.FIELD OF THE INVENTION [0002]The present invention is directed to a method and a device for producing a hollow metallic billet from a metallic billet by a piercing operation, for example using a piercing mandrel.BACKGROUND OF THE INVENTION[0003]For the production of tubes, particularly seamless tubes, it is known to make a hole in a solid billet serving as the feedstock, thus creating a hollow billet that can be used directly as a tube or can be put through additional processing steps. Particularly in the production of steel tubes, hollow billets are made from heated solid steel billets in a single-stage or multi-stage continuous rolling process, and particularly in a forming unit for making holes in billets, for example a cross-roll piercing mill or a pun...
Claims
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IPC IPC(8): B21B19/04
CPCB21B19/04B21B23/00B21B2045/0227B21J5/10
Inventor STOLL, PAULKRUX, RAINERZEMKO, MICHAL
Owner BENTELER STEEL TUBE