EP0297475A2 - Plate drawing apparatus - Google Patents
Plate drawing apparatus Download PDFInfo
- Publication number
- EP0297475A2 EP0297475A2 EP88110182A EP88110182A EP0297475A2 EP 0297475 A2 EP0297475 A2 EP 0297475A2 EP 88110182 A EP88110182 A EP 88110182A EP 88110182 A EP88110182 A EP 88110182A EP 0297475 A2 EP0297475 A2 EP 0297475A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- die
- punch
- plate
- pistons
- stroke
- 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.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/04—Blank holders; Mounting means therefor
- B21D24/08—Pneumatically or hydraulically loaded blank holders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
- a) a supporting structure formed by a punch-holder part and by an opposite part, connected by at least two, preferably four, tension elements;
- b) a punch supported by said punch-holder part and adapted to engage and disengage a corresponding die, the coupling between said punch and said die determining the shape of the drawing of said plate;
- c) an abutment body supporting said die and slideable along said tension elements for a stroke at least corresponding to the depth of the drawing to be obtained on said plate.
Description
- The present invention relates to an apparatus for drawing plate. In particular the field of the present invention is that of presses for drawing plate, which comprise a supporting structure formed by a punch-holder part, which is generally the base of the press, by an opposite part, generally arranged at the top of the press, and by a number of connecting tension elements, generally four, which also have the function of guides for the sliding of the moving parts of the press. The punch, generally actuated by a piston, is surrounded by a hollow blank holder body and couples, during actuation, with a die supported by an abutment body, generally called "ram", thus determining the shape of the drawn part. The plate is placed and pressed, for drawing, between the die and the hollow blank holder body. Naturally the operating pressures between the die and the hollow blank holder body must be high.
- So that the drawn part may be extracted, the die must be raisable by an amount at least equal to the depth of the executed drawing.
- The above briefly represents the main field of industrial application of the invention, which field does not however constitute a limitation of its scope, since the apparatus according to the invention, in particular as described and claimed hereinafter, can be advantageously used in any other equivalent field in which drawing processes are performed.
- Devices of this type, wherein the lifting of the die (for the extraction of the drawn part after drawing) occurs by means of one or more pistons, are known. These pistons press, during drawing, the die against the hollow blank holder body until the pressure required for drawing is obtained.
- According to another known embodiment, the pistons which press the die against the hollow blank holder body are merely pressers and have no return valves. In this case the lifting of the die for the extraction of the drawn part after drawing occurs by means of a special small-size piston, preset for this purpose alone.
- Such known devices, however, entail some problems; in particular very bulky structures are required to achieve high pressures; in particular, to achieve a load of one thousand tons with four pistons it is generally necessary to use a ram having a transverse cross section with a surface of approximately 2,250,000 sq. mm. Smaller dimensions may be achieved by reducing the number of the pistons, but in this case one would have to renounce the possibility of adjusting and compensating the pressure among the various pistons according to the particular drawing requirements of the part involved. At least four pistons are in fact considered necessary to achieve a complete possibility of adjustment. To increase the load with equal dimensions and with an equal number of pistons it would be necessary to increase the operating pressure of each piston. However, above normal hydraulic operating pressures, around 250 atm, it is necessary to resort to extremely sophisticated and expensive special devices, which are thus in practice not usable in the field of plate drawing machines.
- All the above mentioned devices are furthermore complicated and expensive to manufacture, since the long-stroke pistons which press the die against the blank holder require special quick-filling valves and special maintenance.
- The aim of the present invention is to eliminate the above described disadvantages by providing an apparatus which allows to achieve a high load using a normal number of pistons and normal operating pressures.
- An object of the invention is to allow a constructive simplification by eliminating the long-stroke pistons and the quick-filling valves.
- A further object of the invention is to reduce dimensions by eliminating the need to provide pits in the floor for the insertion of the machine.
- Not least object of the invention is to achieve a simplification of maintenance.
- This aim, as well as these and other objects, are achieved by the apparatus according to the invention, which comprises:
- a) a supporting structure formed by a punch-holder part and
by an opposite part, connected by at least two, preferably four, tension elements; - b) a punch supported by said punch-holder part and adapted to engage and disengage a corresponding die, the coupling between said punch and said die determining the shape of the drawing of said plate;
- c) an abutment body supporting said die and slideable along said tension elements for a stroke at least corresponding to the depth of the drawing to be obtained on said plate;
- Further characteristics and advantages of the invention will become apparent from the description of a preferred but not exclusive embodiment of the invention, illustrated only by way of non-limitative example in the accompanying drawings, wherein:
- figure 1 is a partially sectional lateral view of the apparatus according to the invention;
- figure 2 is a sectional view taken along the line II-II of figure 1;
- figure 3 is a sectional view taken along the line II-II of figure 1, in a different operating condition;
- figure 4 is a sectional view taken along the line IV-IV of figure 1.
- With reference to figures 1-4, the apparatus according to the invention comprises a supporting structure formed by a punch-
holder part 10 and by anopposite part 11, connected by at least two, preferably fourtension elements - The
punch 16 is supported by the punch-holder part 10 and is adapted to engage and disengage thecorresponding die 17. - The coupling between the
punch 16 and thedie 17 determines the form of the drawing of the plate, so as to allow the forming of tubs, containers, shaped parts, as required, according to the configuration of thepunch 16 and of thecorresponding die 17. - An abutment body or
ram 20 is provided, supporting thedie 17, and is slideable along thetension elements - The
abutment body 20 is formed by afirst element 21 which supports thedie 17 and by asecond element 22. Thefirst element 21 and thesecond element 22 are mutually coupled by means of a plurality of pistons, for example by means of the four short-stroke pistons element 21 or by theelement 22. In the embodiment illustrated in the figure, the fourpistons second element 22. In particular thesecond element 22 has circular dead holes which constitute the seats for the accommodation of each of the fourpistons oil sealing gaskets 27 allow continuous operation at a normal hydraulic pressure of 250 atm. - The
second element 22 is preferably connected to said oppositepart 11, in particular to the top of the press, by means of apiston 28 which has a stroke at least corresponding in length to the depth of the drawing to be obtained on the plate. - The
second element 22 is lockable in working position by virtue of mechanical locking means. Said mechanical locking means preferably comprise a plurality ofspacers 30, which engage thesecond element 22 and theopposite part 11. Thespacers 30 are preferably fixable to thesecond element 22 and can slide throughappropriate openings 31 provided on theopposite part 11. According to another embodiment, thespacers 30 are fixable to theopposite part 11 and can slide through appropriate openings provided on thesecond element 22. Naturally the execution of this second embodiment requires a much greater thickness of thesecond element 22 with respect to that indicated in the figures and in any case sufficient to accommodate the length of thespacers 30. - The
spacers 30 are preferably lockable by means of arotating plate 32 which opens or closes theopenings 31 according to its angle of rotation. In particular figure 2 shows therotating plate 32 in the position in which theopenings 31 are open and can accommodate thespacers 30; figure 3 shows therotating plate 32 in the position in which theopenings 31 are closed and thespacers 30 can operate in compression. - According to another embodiment, the
spacers 30 are lockable by means of a slideable plate, not illustrated in the figure, which opens or closes theopenings 31 according to the sliding positions. - The operation is as follows: the plate part to be drawn is inserted between the
die 17 and theblank holder 35, then theabutment body 20 is caused to descend, by means of the action of thepiston 28, along thetension elements die 17 and theblank holder 35 is still very small since thepiston 28 only has the function of moving theabutment body 20 and is not capable of transmitting compression forces useful for drawing. The action of thepiston 28 has, in any case, allowed the exit of thespacers 30 out of theopenings 31. Then the rotatingplate 32 is caused to rotate until it reaches the position indicated in figure 3 to close theopenings 31. At this point the four short-stroke pistons first element 21 and thesecond element 22 of theabutment body 20. Then the action of thepunch 16 performs the actual drawing. To extract the drawn part it is necessary to return the rotating plate to the position indicated in figure 1 and actuate thepiston 28 to cause the retraction of thespacers 30 inside theopenings 31 for the entire length of the stroke x. The drawn part can thus be easily extracted. The sequence of operations is then repeated for the subsequent part. - The invention thus conceived is susceptible to numerous modifications and variations, all of which are within the scope of the inventive concept; thus, for example, the locking means may differ from the
spacers 30 and may intervene, for example, directly on thetension elements piston 28 may be mounted in reverse manner directly on thesecond element 22 or may be replaced with equivalent means, such as for example a rack. Thepistons first element 21 and perform, in an equivalent manner, the spacing between thefirst element 21 and thesecond element 22. - The
tension elements holder part 10 and to theopposite part 11. In this case the sliding of theabutment body 20 occurs on appropriate guides provided on the two lateral tension elements or shoulders. - In practice it has been observed that the apparatus according to the invention allows to achieve all the intended aims, in particular it is possible to achieve a load of 1000 tons with an
abutment body 20 having a transverse cross section with a surface of only 810,000 sq.mm., which is over two and a half times smaller than the corresponding cross section obtainable with known presses with an equal number of pistons and with the same oil feed pressure.
the working pressure required for drawing being obtained by means of the action of said plurality of short-stroke pistons; the sliding of said abutment body, required for the extraction of the drawn part, being obtained by means of the release of said mechanical locking means.
Claims (9)
a) a supporting structure formed by a punch-holder part and
by an opposite part, connected by at least two, preferably four, tension elements;
b) a punch supported by said punch-holder part and adapted to engage and disengage a corresponding die, the coupling between said punch and said die determining the shape of the drawing of said plate
c) an abutment body supporting said die and slideable along said tension elements for a stroke at least corresponding to the depth of the drawing to be obtained on said plate;
characterized in that said abutment body is formed by a first element supporting said die and by a second element; said first and said second element being mutually coupled by means of a plurality of short-stroke pistons supported by one of said elements; said second element being lockable in working position by virtue of mechanical locking means;
the working pressure required for drawing being obtained by means of the action of said plurality of short-stroke pistons; the sliding of said abutment body, required for the extraction of the drawn part, being obtained by means of the release of said mechanical locking means.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2111287 | 1987-06-30 | ||
IT21112/87A IT1217320B (en) | 1987-06-30 | 1987-06-30 | APPARATUS FOR DRAWING THE SHEET |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0297475A2 true EP0297475A2 (en) | 1989-01-04 |
EP0297475A3 EP0297475A3 (en) | 1990-06-27 |
EP0297475B1 EP0297475B1 (en) | 1992-11-25 |
Family
ID=11176921
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88110182A Expired EP0297475B1 (en) | 1987-06-30 | 1988-06-25 | Plate drawing apparatus |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0297475B1 (en) |
DE (1) | DE3876152T2 (en) |
ES (1) | ES2035888T3 (en) |
IT (1) | IT1217320B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0401534A1 (en) * | 1989-05-13 | 1990-12-12 | Maschinenfabrik Müller-Weingarten AG | Hydraulic drawing system in a single or double working press |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2718663A (en) * | 1949-09-30 | 1955-09-27 | Crown Machine & Tool Company | Injection molding machine |
CH383777A (en) * | 1962-02-12 | 1964-10-31 | Triulzi S A S Novate A | Closing device for presses |
FR2141615A1 (en) * | 1971-06-14 | 1973-01-26 | Morault Gabriel | |
DE3404307A1 (en) * | 1984-02-08 | 1985-08-14 | Adam Opel AG, 6090 Rüsselsheim | Drawing apparatus |
-
1987
- 1987-06-30 IT IT21112/87A patent/IT1217320B/en active
-
1988
- 1988-06-25 DE DE8888110182T patent/DE3876152T2/en not_active Expired - Fee Related
- 1988-06-25 ES ES198888110182T patent/ES2035888T3/en not_active Expired - Lifetime
- 1988-06-25 EP EP88110182A patent/EP0297475B1/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2718663A (en) * | 1949-09-30 | 1955-09-27 | Crown Machine & Tool Company | Injection molding machine |
CH383777A (en) * | 1962-02-12 | 1964-10-31 | Triulzi S A S Novate A | Closing device for presses |
FR2141615A1 (en) * | 1971-06-14 | 1973-01-26 | Morault Gabriel | |
DE3404307A1 (en) * | 1984-02-08 | 1985-08-14 | Adam Opel AG, 6090 Rüsselsheim | Drawing apparatus |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0401534A1 (en) * | 1989-05-13 | 1990-12-12 | Maschinenfabrik Müller-Weingarten AG | Hydraulic drawing system in a single or double working press |
Also Published As
Publication number | Publication date |
---|---|
EP0297475A3 (en) | 1990-06-27 |
DE3876152D1 (en) | 1993-01-07 |
DE3876152T2 (en) | 1993-04-15 |
IT1217320B (en) | 1990-03-22 |
IT8721112A0 (en) | 1987-06-30 |
EP0297475B1 (en) | 1992-11-25 |
ES2035888T3 (en) | 1993-05-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP3578760B2 (en) | Apparatus and method for hydroforming sheet metal | |
DE1777332A1 (en) | Deep drawing device | |
KR19990028590A (en) | High speed and high load cylinder device and its control method | |
US7806031B1 (en) | Device for finely cutting workpieces from a material | |
US4779443A (en) | Complex pressing die apparatus | |
US10556263B2 (en) | Deformation Method and Press | |
DE102007035032A1 (en) | Precision cutting press | |
US4369907A (en) | Punching and riveting machine | |
WO2005075183A1 (en) | Press comprising a locked slide | |
KR20030093333A (en) | Hydro-mechanical clamp in particular for transverse extrusion | |
DE19842750A1 (en) | Deep-drawn hollow part or tool manufacture comprises placing sheet holder against die, moving drawing punch, bringing punch against die and separating punch and die | |
EP0297475A2 (en) | Plate drawing apparatus | |
DE19962607B4 (en) | Tool cassette with resilient die | |
DE3030050A1 (en) | LOAD BALANCING DEVICE FOR PRESS TOOLS | |
JPH08112699A (en) | Sliding device of machine press | |
DE4302263A1 (en) | Mechanical transfer press with hydraulic units | |
DE19814487A1 (en) | Locking arrangement for forming tools used for powder pressing, precision forging, thixoforging, injection pressing, injection molding etc. | |
EP2210686B1 (en) | Press for hot pressing billets and the like | |
KR20230143291A (en) | Half drawing press and method for controlling the press | |
DE102004006126A1 (en) | Hydraulic press has press ram locked to lower belt after advancing stroke by piston rods of hydraulic piston-cylinder units | |
US4945796A (en) | Method of punching material | |
EP1293337B1 (en) | Bolster-elevating device for a press | |
DE19607257C2 (en) | Hydraulic sheet metal press | |
DK2586543T3 (en) | stamp Press | |
DE10215003A1 (en) | Hydraulic press used for deep drawing operations has press body connected to two columns in each of three piston and cylinder assemblies |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
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 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): BE DE ES FR GB NL SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): BE DE ES FR GB NL SE |
|
17P | Request for examination filed |
Effective date: 19901127 |
|
17Q | First examination report despatched |
Effective date: 19910827 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE ES FR GB NL SE |
|
REF | Corresponds to: |
Ref document number: 3876152 Country of ref document: DE Date of ref document: 19930107 |
|
ET | Fr: translation filed | ||
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2035888 Country of ref document: ES Kind code of ref document: T3 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19930625 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19930626 Ref country code: ES Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 19930626 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Effective date: 19930630 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
BERE | Be: lapsed |
Owner name: FIR S.R.L. Effective date: 19930630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19940101 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19930625 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19940228 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19940301 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
EUG | Se: european patent has lapsed |
Ref document number: 88110182.8 Effective date: 19940110 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 19990601 |