EP0781612A1 - Electrode in an electric gathering apparatus - Google Patents
Electrode in an electric gathering apparatus Download PDFInfo
- Publication number
- EP0781612A1 EP0781612A1 EP95120709A EP95120709A EP0781612A1 EP 0781612 A1 EP0781612 A1 EP 0781612A1 EP 95120709 A EP95120709 A EP 95120709A EP 95120709 A EP95120709 A EP 95120709A EP 0781612 A1 EP0781612 A1 EP 0781612A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- bore
- conductive plate
- engagement bore
- workpiece
- 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- Withdrawn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
- B21J9/00—Forging presses
- B21J9/02—Special design or construction
- B21J9/06—Swaging presses; Upsetting presses
- B21J9/08—Swaging presses; Upsetting presses equipped with devices for heating the work-piece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/20—Making machine elements valve parts
- B21K1/22—Making machine elements valve parts poppet valves, e.g. for internal-combustion engines
Definitions
- the present invention relates to a long-life electrode used in an electric gathering apparatus.
- Material is molded to a rough body which is similar to a product and is subjected to mechanical processing to manufacture a poppet valve.
- a rough body As means for molding the rough body, for example, as shown in Fig. 2, an elongate material 1 is molded to a primary rough body 2 which has a spherical end portion by an electric gathering apparatus "A”, and is subjected to hot forging by a pressing machine to form a secondary rough body 3.
- the electric gathering apparatus “A” comprises an upper electrode 4, a lower electrode 5, a pusher 6 which goes up and down, for example, by hydraulic means, and a power source 7 for supplying current to the electrodes 4 and 5.
- Fig. 3 illustrates a rotary electrode 4.
- the bottom-having cylindrical rotary electrode 4 which has different diameters is rotatably supported releasably by a pair of suspension members 8 to a stationary member 9 of the electric gathering apparatus "A" not to move vertically and laterally as shown in Fig. 2.
- a conductive plate 11 is cylindrical, and has four vertical engagement grooves 12 on the outer circumferential surface and a hexagonal engagement bore 13 around an axis.
- the conductive plate 11 is engaged in the rotary electrode 4 by fitting the engagement projections 10 in the engagement grooves 12 such that the upper surfaces are in the same plane.
- a hexagonal engagement plate 16 is fixed to the lower end of a drive shaft 15 of a drive member 14, such that the engagement plate 16 is detachable from the engagement bore 13.
- the drive shaft 15 is rotated intermittently by a motor (not shown), so that the rotary electrode 4 is simultaneously rotated.
- the conductive plate 11 of the rotary electrode 4 is made of copper, and the upper inner edge of the engagement bore 13 is isolated from air, thereby involving poor radiation of heat. Further, when a workpiece is processed, it is subjected to high temperature, and gathering is repeated at a number of times, so that the edge portions are gradually deformed inwards to generate a burr 17. Therefore, for example, to replace the rotary electrode 4, it is difficult to break down each member, which often requires repair and processing.
- an electrode in an electric gathering apparatus for supplying current to a workpiece which is held between upper and lower electrodes to press the workpiece towards the upper electrode to expand an upper end of the workpiece
- the upper electrode comprising a rotary electrode on which the upper end of the workpiece is engaged, and a conductive plate which is engaged in a bottom-having bore on the rotary electrode releasably and unrotatably, the conductive plate having a polygonal engagement bore in which a drive shaft is fitted around its axis, an annular cut-away portion which is larger than the engagement bore in diameter being formed at an upper edge of the engagement bore.
- the cut-away portion having larger diameter is continuously formed with the engagement bore at the upper edge of the engagement bore of the conductive plate, so that a burr which is generated inwards by deformation of the upper edge of the engagement bore owing to rise in temperature during gathering does not project to outlet and inlet pathes of the drive shaft.
- a burr which is generated inwards by deformation of the upper edge of the engagement bore owing to rise in temperature during gathering does not project to outlet and inlet pathes of the drive shaft.
- Fig. 1 illustrates a conductive plate 18 used in an electrode of the present invention, and the other members allotted by the same numerals are similar to the foregoing description. The detailed description thereof is omitted.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Forging (AREA)
- Constitution Of High-Frequency Heating (AREA)
Abstract
In a conductive plate of an upper electrode (4) of an electric gathering apparatus (A) for manufacturing a poppet valve used in an internal combustion engine, there is formed a polygonal bore (20) in which a drive shaft (15) is engaged. An annular cut-away portion (21) which is larger than the engagement bore (20) in diameter is formed, thereby preventing a burr (17,23) and increasing durability of the electrode.
Description
- The present invention relates to a long-life electrode used in an electric gathering apparatus.
- Material is molded to a rough body which is similar to a product and is subjected to mechanical processing to manufacture a poppet valve. As means for molding the rough body, for example, as shown in Fig. 2, an elongate material 1 is molded to a primary
rough body 2 which has a spherical end portion by an electric gathering apparatus "A", and is subjected to hot forging by a pressing machine to form a secondary rough body 3. - The electric gathering apparatus "A" comprises an upper electrode 4, a lower electrode 5, a pusher 6 which goes up and down, for example, by hydraulic means, and a power source 7 for supplying current to the electrodes 4 and 5.
- Fig. 3 illustrates a rotary electrode 4. The bottom-having cylindrical rotary electrode 4 which has different diameters is rotatably supported releasably by a pair of suspension members 8 to a stationary member 9 of the electric gathering apparatus "A" not to move vertically and laterally as shown in Fig. 2. There are provided four
projections 10 at regular intervals in an upper larger-diameter portion 4a. - A
conductive plate 11 is cylindrical, and has fourvertical engagement grooves 12 on the outer circumferential surface and a hexagonal engagement bore 13 around an axis. Theconductive plate 11 is engaged in the rotary electrode 4 by fitting theengagement projections 10 in theengagement grooves 12 such that the upper surfaces are in the same plane. - A
hexagonal engagement plate 16 is fixed to the lower end of adrive shaft 15 of adrive member 14, such that theengagement plate 16 is detachable from the engagement bore 13. Thedrive shaft 15 is rotated intermittently by a motor (not shown), so that the rotary electrode 4 is simultaneously rotated. - The
conductive plate 11 of the rotary electrode 4 is made of copper, and the upper inner edge of theengagement bore 13 is isolated from air, thereby involving poor radiation of heat. Further, when a workpiece is processed, it is subjected to high temperature, and gathering is repeated at a number of times, so that the edge portions are gradually deformed inwards to generate aburr 17. Therefore, for example, to replace the rotary electrode 4, it is difficult to break down each member, which often requires repair and processing. - It is an object of the present invention to provide an electrode of an electric gathering which is continuously usable for a long time without repairing.
- To achieve the object, according to the present invention, there is provided an electrode in an electric gathering apparatus for supplying current to a workpiece which is held between upper and lower electrodes to press the workpiece towards the upper electrode to expand an upper end of the workpiece, the upper electrode comprising a rotary electrode on which the upper end of the workpiece is engaged, and a conductive plate which is engaged in a bottom-having bore on the rotary electrode releasably and unrotatably, the conductive plate having a polygonal engagement bore in which a drive shaft is fitted around its axis, an annular cut-away portion which is larger than the engagement bore in diameter being formed at an upper edge of the engagement bore.
- According to the present invention, the cut-away portion having larger diameter is continuously formed with the engagement bore at the upper edge of the engagement bore of the conductive plate, so that a burr which is generated inwards by deformation of the upper edge of the engagement bore owing to rise in temperature during gathering does not project to outlet and inlet pathes of the drive shaft. Thus, it can be continuously used for a long time.
- The features and advantages of the present invention will become more apparent from the following description of preferred embodiment with respect to appended drawings wherein:
- Fig. 1 is a central longitudinal sectional front view of a conductive plate which is used in an electrode of the present invention;
- Fig. 2 is a front elevational view of an electric gathering apparatus in which a workpiece is processed;
- Fig. 3 is an exploded perspective view of a conventional electrode; and
- Fig. 4 is a central longitudinal front view of a conventional conductive plate.
- Fig. 1 illustrates a
conductive plate 18 used in an electrode of the present invention, and the other members allotted by the same numerals are similar to the foregoing description. The detailed description thereof is omitted. On the outer circumferential surface of theconductive plate 18, there are formedengagement grooves 19 and a hexagonal engagement bore 20 around its axis similar to the above. At the upper and lower ends of the engagement bore 20, there are formed and chamfered annular cut-awayportions 21 which is larger than the engagement bore 20 in diameter. At the upper and lower edges of the outer circumferential surface of theconductive plate 18, there are formed and chamfered arcuate cut-awayportions 22. - Thus, even if the
conductive plate 18 is heated and there is formed aburr 23 on the upper edge of the engagement bore 20 and the upper and lower edges of the outer circumferential surface, it does not project to the path of thedrive member 14. Even if it is continuously used for a long time, thedrive member 14 can be easily pulled out of theconductive plate 18. - The foregoings merely relate to an embodiment of the present invention. Various changes and modifications may be made by person skilled in the art without departing from the scope of claims wherein:
Claims (2)
- An electrode in an electric gathering for supplying current to a workpiece which is held between upper and lower electrodes to press the workpiece towards the upper electrode to expand an upper end of the workpiece, the upper electrode comprising a rotary electrode on which the upper end of the workpiece is engaged, and a conductive plate which is engaged in a bottom-having bore on the rotary electrode releasably and unrotatably, the conductive plate having a polygonal engagement bore in which a drive shaft is fitted around its axis, an annular cut-away portion which is larger than the engagement bore in diameter being formed at an upper edge of the engagement bore.
- An electrode as defined in claim 1 wherein an annular cut-away portion which is larger than the engagement bore in diameter is formed at a lower edge of the engagement bore.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6164978A JPH0824984A (en) | 1994-07-18 | 1994-07-18 | Electrode of electric forged upsetting machine |
EP95120709A EP0781612A1 (en) | 1994-07-18 | 1995-12-29 | Electrode in an electric gathering apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6164978A JPH0824984A (en) | 1994-07-18 | 1994-07-18 | Electrode of electric forged upsetting machine |
EP95120709A EP0781612A1 (en) | 1994-07-18 | 1995-12-29 | Electrode in an electric gathering apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0781612A1 true EP0781612A1 (en) | 1997-07-02 |
Family
ID=26139004
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95120709A Withdrawn EP0781612A1 (en) | 1994-07-18 | 1995-12-29 | Electrode in an electric gathering apparatus |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0781612A1 (en) |
JP (1) | JPH0824984A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1127953A2 (en) * | 2000-02-23 | 2001-08-29 | Fuji Oozx Inc. | Method of manufacturing a ti alloy poppet valve |
EP2272993A1 (en) * | 2009-06-05 | 2011-01-12 | Böhler Schmiedetechnik GmbH & Co KG | Method for producing a forged article from a gamma-titanium-aluminium base alloy |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4943778B2 (en) * | 2006-08-28 | 2012-05-30 | 本田技研工業株式会社 | Upset molding equipment |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3242695A (en) * | 1963-12-23 | 1966-03-29 | Ford Motor Co | Slip spline lubrication system |
GB2024310A (en) * | 1978-07-03 | 1980-01-09 | Ingersoll Rand Co | Universal joint |
JPS60133945A (en) * | 1983-11-09 | 1985-07-17 | Mitsubishi Heavy Ind Ltd | Electric upsetter |
DE3538950A1 (en) * | 1984-11-23 | 1986-06-05 | Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid | Viscose pump, especially gear pump |
US5153547A (en) * | 1990-06-20 | 1992-10-06 | Toko Kabushiki Kaisha | High frequency coil |
-
1994
- 1994-07-18 JP JP6164978A patent/JPH0824984A/en active Pending
-
1995
- 1995-12-29 EP EP95120709A patent/EP0781612A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3242695A (en) * | 1963-12-23 | 1966-03-29 | Ford Motor Co | Slip spline lubrication system |
GB2024310A (en) * | 1978-07-03 | 1980-01-09 | Ingersoll Rand Co | Universal joint |
JPS60133945A (en) * | 1983-11-09 | 1985-07-17 | Mitsubishi Heavy Ind Ltd | Electric upsetter |
DE3538950A1 (en) * | 1984-11-23 | 1986-06-05 | Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid | Viscose pump, especially gear pump |
US5153547A (en) * | 1990-06-20 | 1992-10-06 | Toko Kabushiki Kaisha | High frequency coil |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 009, no. 297 (M - 432) 25 November 1985 (1985-11-25) * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1127953A2 (en) * | 2000-02-23 | 2001-08-29 | Fuji Oozx Inc. | Method of manufacturing a ti alloy poppet valve |
EP1127953A3 (en) * | 2000-02-23 | 2002-05-29 | Fuji Oozx Inc. | Method of manufacturing a ti alloy poppet valve |
EP2272993A1 (en) * | 2009-06-05 | 2011-01-12 | Böhler Schmiedetechnik GmbH & Co KG | Method for producing a forged article from a gamma-titanium-aluminium base alloy |
US8828160B2 (en) | 2009-06-05 | 2014-09-09 | Boehler Schmiedetechnik Gmbh & Co. Kg. | Method for producing a forging from a gamma titanium aluminum-based alloy |
Also Published As
Publication number | Publication date |
---|---|
JPH0824984A (en) | 1996-01-30 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE ES FR GB IT |
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17P | Request for examination filed |
Effective date: 19970906 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19980701 |