EP1955790A1 - Electric upsetting method and apparatus - Google Patents
Electric upsetting method and apparatus Download PDFInfo
- Publication number
- EP1955790A1 EP1955790A1 EP07425069A EP07425069A EP1955790A1 EP 1955790 A1 EP1955790 A1 EP 1955790A1 EP 07425069 A EP07425069 A EP 07425069A EP 07425069 A EP07425069 A EP 07425069A EP 1955790 A1 EP1955790 A1 EP 1955790A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode clamp
- electrode
- metal strap
- upsetting
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
Abstract
Description
- The present invention relates to processes of electric upsetting, i.e., of hot plastic deformation by means of which localized increments of the transverse dimensions of a metal piece are obtained, by accordingly reducing the length thereof.
- More in particular the invention relates to a method and a machine for the electric upsetting of metal strap, particularly, albeit not exclusively, for the production of forged knives, for example with dimensions in the region of 4x60x600 mm or 3x30x400 mm.
- Current electric-upsetting machines for forming metal bars typically comprise a stationary-electrode clamp and a mobile-electrode clamp, between which the metal bar is to be positioned and heated, by the Joule effect, in its area comprised between said clamps. A thrust device applies a thrust upon one end of the bar, whilst the mobile-electrode clamp moves away from the stationary-electrode clamp in a direction concordant with that of the thrust device.
- This arrangement evidently enables performance of a single upsetting operation. In some applications, typically in the case of forged cutlery, the metal strap must be subjected to a second electric upsetting to form a second upset area: this requires the use of a second machine provided for said purpose, or at least repositioning of the metal strap in the same electric-upsetting machine, in this case re-programmed for the second operation.
- The purpose of the present invention is to provide a method and a machine for electric upsetting of metal strap that will enable simultaneous formation of two contiguous upsetting operations, which are altogether independent of one another in terms of volume, length, and also temperature of the two upset areas.
- According to the invention, this purpose is achieved thanks to a method of electric upsetting, as defined in its most general terms in
Claim 1, and to an electric-upsetting machine, as defined inClaim 3. - The invention will now be described in detail with reference to the annexed plate of drawings, which are provided purely by of way of non-limiting example and in which:
-
Figure 1 is a plan view of an example of metal strap prior to an operation of electric upsetting that can be obtained via the invention; -
Figure 2 is a side elevation ofFigure 1 ; -
Figure 3 is a view similar to that ofFigure 1 that illustrates the metal strap subsequent to the operations of electric upsetting; -
Figure 4 is a schematic front elevation of an electric-upsetting machine according to the invention, represented in an initial step of the electric-upsetting cycle; and -
Figures 5 to 8 are views similar to that ofFigure 4 that show the subsequent steps of the electric-upsetting cycle according to the invention. -
Figures 1 and 2 show, by way of example, a metal strap B, designed for the production of a forged knife and having, for example, dimensions in the region of 4x60x600 mm or 3x30x400 mm. - The method and the machine according to the invention enable, via two simultaneous but independent electric-upsetting cycles, increase in the transverse dimensions of the metal strap B in an area corresponding to two areas Z1, Z2, by accordingly reducing the length thereof, in the way represented in
Figure 3 . - With reference to
Figure 4 , the electric-upsetting machine according to the invention basically comprises a horizontal supportingstructure 1 bearing alongitudinal guide 2 that extends on opposite sides with respect to a stationary central body, designated as a whole by 3. - The
central body 3 consists in an electrode clamp including afixed bottom element 4 and a mobiletop element 5 displaceable vertically with respect to thefixed bottom element 4, for example via afluid actuator 11, between a raised, inoperative, position (represented inFigures 4 and8 ) and a lowered, operative, position (represented inFigures 5 ,6 and7 ). - On opposite sides of the
central body 3, the supportingstructure 1 bears a firstmobile body 6 and a second mobile body 7, each of which is displaceable at a controlled rate, via a respective motor-driven system (not illustrated in so far as it is within the reach of any person skilled in the branch), along theguide 2, with the modalities described in what follows. - The first
mobile body 6 also consists in an electrode clamp, with a vertically fixedbottom element 8 and a vertically mobiletop element 9, which is displaceable, via an actuator, for example, afluid actuator 10, between a raised, inoperative, position (represented inFigures 4 and8 ) and a lowered, operative, position (represented inFigures 5-7 ). - On the side facing the
central body 3, the bottom andtop elements mobile body 6 bear a first upsetting apparatus, designated as a whole by 12, facing a corresponding upsetting apparatus of thecentral body 3. - The second mobile body 7 has a conformation specularly similar to that of the first
mobile body 6, with an electrode clamp formed by a vertically fixedbottom element 13 and a vertically mobiletop element 14, which is also displaceable, for example, via afluid actuator 15, between a raised, inoperative, position (represented inFigures 4 and8 ) and a lowered, operative, position (represented inFigures 5-7 ), with the modalities also described in what follows. The ends of the fixed andmobile elements fixed body 3 in turn bear a second upsetting apparatus, designated as a whole by 16 and facing a corresponding upsetting apparatus of thecentral body 3. - The electrode clamps 8-9 of the first
mobile body 6 and 13-14 of the second mobile body 7 define respective electrical sliding contacts designed to cooperate with those of the electrode clamp defined by the elements 4-5 of thecentral body 3. Said contacts may conveniently be supplied in a separate way, via respective autonomous and independent transformers, designated as a whole by 17, 18 inFigure 4 . - Designated by 19 and 20 are two pushers situated on opposite sides with respect to the assembly that is constituted by the
bodies guide 2 and, via respective motor-driventhrust carriages Figures 4 and8 , and progressively advanced positions, represented inFigures 5 ,6 and7 , at a controlled pressure, with the modalities also clarified in what follows. - The various motor-driven actuators of the components described above are connected to a programmable electronic unit (not illustrated) for control of the simultaneous double electric-upsetting cycle, hereinafter described with reference to the metal strap B of
Figures 1 and 2 . - As has already been clarified previously, said metal strap B can, for example, constitute the starting element for the production of forged knives equipped with two "nodes", one between the blade and the handle and the other at the end of the handle, designated, respectively, by Z1 and Z2 in
Figure 3 . - In the first step of the electric-upsetting cycle represented in
Figure 4 , the metal strap B is positioned through thebodies stationary bottom elements mobile elements - In the subsequent step, represented in
Figure 5 , themobile elements bodies respective actuators pushers respective thrust carriages Figures 5 to 7 . - Then, the electrode clamps of the
mobile bodies 6 and 7 are electrically supplied via therespective transformers upsetting apparatus 12 of themobile body 6 and the one corresponding to thefixed body 3 on one side, and between theupsetting apparatus 16 of the mobile body 7 and the one corresponding to thefixed body 3 on the other. When said areas reach the temperature of incandescence, thepushers mobile bodies 6 and 7 are displaced at a controlled rate in the direction of the arrows A and A', moving progressively away from thecentral body 3, in the way represented inFigures 6 and7 . In this way, the volume of the incandescent areas of the bar in contact with theapparatuses Figure 3 , are generated. - The electrode clamps 8-9 of the first
mobile body 6 and 13-14 of the second mobile body 7 consequently effect displacement in the working step, moving with respect to thefixed body 3 in a direction contrary to thethrust devices - At the end (
Figure 8 ), heating of the metal strap B is interrupted, thepushers mobile elements bodies - It will appear evident from the foregoing description that the method and the machine according to the invention advantageously enable two simultaneous electric-upsetting cycles to be carried out with restricted distances between centres (for example, in the region of 80-100 mm) and independent of one another as regards volumes, lengths and temperatures, an advantage that enables an appreciable reduction in the times of production of electrically upset metal strap, in particular for the production of forged knives, mechanical components, etc.
- Of course, the details of construction and the embodiments may vary widely with respect to what is described and illustrated herein, without thereby departing from the scope of the present invention, as defined by the ensuing claims.
Claims (4)
- A method of electric upsetting of metal strap, characterized in that it comprises the steps of positioning a metal strap (B) in electrical contact between a first electrode clamp (3) and a second electrode clamp and a third electrode clamp (6, 7), which are set on opposite sides to said first electrode clamp (3) for delimiting with the latter a first area of heating and a second area of heating (Z1, Z2) of the metal strap (B), heating by the Joule effect said metal strap (B) in an area corresponding to said first area of heating and second area of heating (Z1, Z2) via said electrode clamps (3, 6, 7), and applying a first controlled thrust and a second controlled thrust at the opposite ends of the metal strap (B) so as to carry out simultaneous upsetting of said first and second areas of heating (Z1, Z2) against said first electrode clamp (3) whilst said second and third electrode clamps (6, 7) are moved at a controlled rate with respect to said first electrode clamp (3) in a direction opposite to the thrust exerted, respectively, by said first thrust device (19) and said second thrust device (20).
- The method of electric upsetting according to Claim 1, characterized in that said second electrode clamp (6) and said third electrode clamp (7) are supplied electrically in an independent way.
- An electric-upsetting machine for forming metal strap, characterized in that it comprises a supporting structure (1) bearing a first electrode clamp (3), a second electrode clamp (6), and a third electrode clamp (7), which can be opened and re-closed and between which a metal strap (B) is to be positioned and heated by the Joule effect, in which said first electrode clamp (3) is stationary and said second and third electrode clamps (6, 7) are set on opposite sides of said first electrode clamp (3) for delimiting with the latter a first area of heating (Z1) and a second area of heating (Z2) of the metal strap (B) and can be displaced along said support (1) in the longitudinal direction of the metal strap (B), and a first thrust device (19) and a second thrust device (20) for applying respective opposed controlled thrusts at the ends of said metal strap (B) so as to press it in its longitudinal direction against said first electrode clamp (3), through said second and said third electrode clamps (6), for carrying out simultaneous upsetting of said first and second areas of heating (Z1, Z2) against said first electrode clamp (3), whilst said second and third electrode clamps (6, 7) are moved at a controlled rate with respect to said first electrode clamp (3) displacing in a direction opposite to the thrust exerted, respectively, by said first thrust device (19) and by said second thrust device (20).
- The electric-upsetting machine according to Claim 3, characterized in that said second electrode clamp (6) and said third electrode clamp (7) are supplied electrically by respective independent transformers (17,18).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07425069A EP1955790A1 (en) | 2007-02-06 | 2007-02-06 | Electric upsetting method and apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07425069A EP1955790A1 (en) | 2007-02-06 | 2007-02-06 | Electric upsetting method and apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1955790A1 true EP1955790A1 (en) | 2008-08-13 |
Family
ID=38068532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07425069A Withdrawn EP1955790A1 (en) | 2007-02-06 | 2007-02-06 | Electric upsetting method and apparatus |
Country Status (1)
Country | Link |
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EP (1) | EP1955790A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6160236A (en) * | 1984-08-31 | 1986-03-27 | Nagura Tekkosho:Kk | Installing method of medium part of blank material and its installing device |
EP0667196A1 (en) * | 1994-02-11 | 1995-08-16 | Electroforge Industries S.A. | Method for the production of solid-headed mechanical structures from tubes and apparatus therefor |
US20060254338A1 (en) * | 2005-01-31 | 2006-11-16 | Showa Denko K.K. | Upsetting method and upsetting apparatus |
-
2007
- 2007-02-06 EP EP07425069A patent/EP1955790A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6160236A (en) * | 1984-08-31 | 1986-03-27 | Nagura Tekkosho:Kk | Installing method of medium part of blank material and its installing device |
EP0667196A1 (en) * | 1994-02-11 | 1995-08-16 | Electroforge Industries S.A. | Method for the production of solid-headed mechanical structures from tubes and apparatus therefor |
US20060254338A1 (en) * | 2005-01-31 | 2006-11-16 | Showa Denko K.K. | Upsetting method and upsetting apparatus |
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