EP0586028A1 - Presse pour fabriquer des articles pressés à dimensions exactes - Google Patents

Presse pour fabriquer des articles pressés à dimensions exactes Download PDF

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Publication number
EP0586028A1
EP0586028A1 EP93250226A EP93250226A EP0586028A1 EP 0586028 A1 EP0586028 A1 EP 0586028A1 EP 93250226 A EP93250226 A EP 93250226A EP 93250226 A EP93250226 A EP 93250226A EP 0586028 A1 EP0586028 A1 EP 0586028A1
Authority
EP
European Patent Office
Prior art keywords
press
pressure
ring piston
hydraulic
bar
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
Application number
EP93250226A
Other languages
German (de)
English (en)
Other versions
EP0586028B1 (fr
Inventor
Gerd Dr.-Ing. Hinzmann
Norbert Dipl.-Ing. Nies
Matthias Holthausen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
Original Assignee
Mannesmann AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0586028A1 publication Critical patent/EP0586028A1/fr
Application granted granted Critical
Publication of EP0586028B1 publication Critical patent/EP0586028B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • B22F2003/033—Press-moulding apparatus therefor with multiple punches working in the same direction

Definitions

  • the invention relates to a press for producing stepped, dimensionally stable pressed bodies made of powdery material, in particular metal powder, according to the preamble of patent claim 1.
  • a generic press is described in DE-G 90 12 752.8.
  • This press is equipped with a tool adapter, in which the die and the lower and upper punches for the manufacture of the pressing bodies are installed as an exchangeable unit.
  • the tool adapter has a base body (base plate) which is firmly supported in the press and contains two hydraulic ring piston systems arranged coaxially one above the other.
  • the piston rods of these ring piston systems protrude upwards out of the base plate and slide into one another in a coaxial manner.
  • the two piston rods On the upper end faces, the two piston rods have fastening surfaces for the attachment of two lower punches, which can be moved hydraulically with the annular piston systems.
  • a die holding plate for receiving a die is connected via column guides to a lower coupling plate to form a framework which can be connected to and moved with the lower bear of the press by means of the lower coupling plate.
  • the upper punch or dies required for the production of pressed bodies are connected to an upper coupling plate, which is guided relative to the die holding plate via further column guides and is coupled to the upper bear of the press and can be moved with it.
  • the tool adapter can have a fixed lower punch supported on the base plate and a center pin which can be moved from the lower bar or from the lower coupling plate.
  • This known construction can have fixed stops for fixing the press end position of the movable lower punch.
  • the ring piston systems for the movement of the lower punches have comparatively large effective piston areas and are therefore able to apply the counter-pressing forces to the pressing forces exerted by the upper punches when there are no fixed stops.
  • a high-pressure pump unit Since the large piston areas are practically equivalent to large cylinder volumes and a high hydraulic pressure is required in the press end position, a high-pressure pump unit must be available for the pressure supply, which must have a relatively high delivery capacity if short cycle times (high driving speeds of the lower punches) are guaranteed should. High-pressure pumps with a high delivery rate are very expensive.
  • stops still have to be set by hand, although the other machine functions can be influenced purely digitally by the CNC control of the machine.
  • the object of the invention is to further develop a generic press in such a way that it also allows the production of more complicated pressing bodies which require more than two movable lower punches, the pressing position of the pressing punches being to be guaranteed without fixed stops solely by means of control technology. The effort required for this should be kept as low as possible.
  • an essential basic idea of the invention is to dissolve the basic body of the tool adapter, which was previously designed as a monolithic plate, into several individual plates, which are rigid are stacked one above the other in the form of individual floors.
  • the individual floors are designed, for example, as individual plates and are firmly supported on one another via spacer blocks.
  • At least one annular piston system is arranged on each floor, each of which can accommodate and move a lower punch. All ring piston systems are arranged coaxially with each other. Due to the distance between the levels, there is sufficient space available to be able to attach the hydraulic connections and the electronic measuring systems.
  • the hydraulic ring piston systems should be designed for the application of high pressure in the range of at least 200 bar, preferably at least 300 bar.
  • the pressure medium supply for the ring piston systems is preferably designed independently of the pressure medium supply for the hydraulically operated press bears (upper and lower bear). The latter have high-pressure hydraulic pumps with high delivery capacity (eg in a 250t press each 250 l / min at 315 bar) to achieve high driving speeds, so they require relatively expensive units.
  • each ring piston system for actuating a lower punch preferably has its own high-pressure pump with a significantly lower delivery line (for example 5-20 l / min), which drastically reduces the costs and simplifies the control, and moreover a common pressure medium source for everyone Ring piston systems available to provide, this pressure medium source can deliver large quantities of hydraulic fluid (eg 250 l / min) at low pressure (eg 20 - 40 bar) in a short time.
  • the volume capacity of the pressure medium source for the low pressure will be at least 5 times, preferably 10 to 20 times the volume capacity of the high pressure supply for the ring piston systems.
  • An appropriately large-volume low-pressure pump is suitable as a low-pressure source, which is combined, if possible, with a hydraulic pressure accumulator for peak demand.
  • a hydraulic pressure accumulator for peak demand.
  • the application area of the press expands significantly, since the pulling and ejecting process or a combination of both processes can be used to mold the pressed body, so that the requirements of even the most complex parts can be met. Adjustment work for any fixed stops is completely eliminated, so that the press operation with a CNC control can be done completely in digital form without manual adjustment work.
  • the electronic position measuring systems required for CNC operation can easily be coupled with the ring piston systems. Securing the ring piston systems against twisting is also possible in a simple manner due to the good accessibility.
  • a base body 1 is exchangeably supported on a receiving device 15 which is firmly connected to the press frame (not shown in more detail in FIG. 1).
  • the base body 1 is made up of three floors 1a, b, c. These each consist of solid plate-shaped bodies which are spaced apart from one another by spacing blocks and which are supported on one another.
  • the levels 1a, b, c of the base body 1 are crossed by at least two columns 10 in corresponding sliding or rolling guides, which connect a die holding plate 9 and a lower coupling plate 11 to form a frame.
  • the die holding plate 9 is equipped with a die 14 which peripherally surrounds the press body 8 to be produced.
  • the lower clutch plate 11 is preferably on the hydraulically operated sub-bears 16 coupled to the press, so that it can move the die holding plate 9 up and down.
  • a further pair of columns 13 is arranged on the upper side of the die-holding plate 9, on which an upper coupling plate 12 is slidably guided.
  • the coupling plate 12 is used for coupling to the upper bears of the press and for receiving one or more upper rams for compressing the pressing body 8.
  • One of three hydraulic ring piston systems 2, 3, 4 is arranged in each of the three levels 1a, b, c.
  • the piston rods of the three ring piston systems 2, 3, 4 are hollow and aligned coaxially with each other.
  • a center pin 17 is provided in a manner known per se, which can be moved hydraulically from the lower coupling plate 11 or from the lower bear 16.
  • the effective piston areas of the ring piston systems 2, 3, 4, in comparison to a construction according to DE 31 42 126 C2 are considerably larger, and the level of the hydraulic pressure applied in the associated cylinder chambers are so matched to the maximum compression forces applied by the upper punches that the moving lower punches 5, 6, 7 are held securely in their final press position can be (position control by the CNC machine control) without the need for any fixed stops.
  • the middle ram 6 can optionally be pulled off to the level of the outer ram 5 or can be used to eject the outer and the inner lower punch 5, 7 can be raised synchronously to the level of the middle upper punch 6.
  • the center pin 17 can be pulled off together with the die, for example. Further process variants are easily conceivable by combining process steps of the pull-off and the ejection process.
  • a fixed lower stamp could be provided, which would be supported directly on the top floor 1c. This would result in a very advantageous, extremely short overall length for this lower punch.
  • a fixed lower punch inevitably turns out to be extremely long, since it has to be supported on the base plate and passed through all stamp carrier plates.
  • FIG. 2 shows the hydraulic diagram for the supply of pressure medium to the annular piston systems 2, 3, 4, the circuit for the inner, deepest arranged annular piston system 2 being exemplarily described.
  • a low pressure supply system (for example 40 bar) is provided in the form of a hydraulic pressure accumulator 21 which is protected by a pressure relief valve 22. The low pressure pump for filling of the pressure accumulator 21 is not shown. Hydraulic fluid can be conveyed from the pressure accumulator 21 through the lines 23, 24 and 27 or 28 in a controlled manner through a servo valve 26 into the upper or lower cylinder space of the annular piston system 2.
  • the line 28 is decoupled from the low-pressure supply system and connected to a high-pressure supply system while the valve 26 is in the right switching position.
  • a high-pressure pump 30 for example 315 bar
  • the high-pressure pump 30 feeds into a line 34, in which a check valve 32 is installed and which leads to a 3/2-way valve 29.
  • the line 34 is connected to the line 35, which connects to the line 24 immediately behind a check valve 25. Due to the higher pressure in line 35, the check valve 25 decouples the low-pressure supply system.
  • the line 34 is connected to a line 36 which opens directly into the line 23, so that there is a connection from the high-pressure pump 30 to the pressure accumulator 21 of the low-pressure supply system.
  • the high-pressure pump 30 in addition to the low-pressure pump to fill the pressure accumulator 21.
  • the use of a low-pressure pump could even be dispensed with entirely if the filling of the pressure accumulator 21 can be guaranteed by the high-pressure pump 30 in an acceptable time.
  • the two ring piston systems 3 and 4 are connected via line 33, which branches off from line 23, to the low-pressure supply system in a corresponding manner (not in detail shown).
  • a separate high-pressure supply system (not shown) is provided for each of the two ring piston systems 3, 4, which can be designed as in the case of the ring piston system 2.
  • a pressure medium pump of 120 bar operating pressure with a delivery rate of 71 l / min is generally sufficient to supply one To enable press operation with short cycle times if an additional hydraulic pressure accumulator is available to cover the quantitative peak demand for hydraulic fluid.
  • a pressure medium supply of, for example, 315 bar operating pressure would have to be available, which is provided by a high-pressure pump with a delivery capacity of 250 l / min in conjunction with an additional hydraulic pressure accumulator would be representable for the peak demand.
  • this pressure medium supply could, however, be easily implemented with a significantly reduced construction effort by a hydraulic pump of only 40 bar operating pressure and a delivery rate of 250 l / min and a hydraulic pressure accumulator for the peak demand if three high-pressure pumps of 315 bar with a Flow rates of only 15 l / min are available.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Press Drives And Press Lines (AREA)
EP93250226A 1992-08-18 1993-08-17 Presse pour fabriquer des articles pressés à dimensions exactes Expired - Lifetime EP0586028B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4227640 1992-08-18
DE4227640A DE4227640A1 (de) 1992-08-18 1992-08-18 Presse zur Herstellung maßhaltiger Preßkörper

Publications (2)

Publication Number Publication Date
EP0586028A1 true EP0586028A1 (fr) 1994-03-09
EP0586028B1 EP0586028B1 (fr) 1996-05-22

Family

ID=6466005

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93250226A Expired - Lifetime EP0586028B1 (fr) 1992-08-18 1993-08-17 Presse pour fabriquer des articles pressés à dimensions exactes

Country Status (3)

Country Link
EP (1) EP0586028B1 (fr)
AT (1) ATE138317T1 (fr)
DE (2) DE4227640A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003059608A1 (fr) * 2002-01-15 2003-07-24 Hawk Precision Components Group, Inc. Outil de forage servant au compactage de materiaux particulaires
CN103612410A (zh) * 2013-11-22 2014-03-05 淮南唐兴液压机械有限责任公司 一种液压机
CN112644070A (zh) * 2020-12-28 2021-04-13 陕西兴盛新材料股份有限公司 一种双层嵌套自定位模具及其电极脱模工艺方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10254656B4 (de) * 2002-11-22 2005-10-13 Dorst Technologies Gmbh & Co. Kg Presseneinrichtung zum Herstellen maßhaltiger Presslinge mit zentraler Stempelabstützung
DE102011114241B4 (de) * 2011-06-09 2014-09-04 Sms Meer Gmbh Hydraulische Antriebsvorrichtung, Hydraulische Endstufe eines hydraulischen Servo-Regelventils, Servo-Regelventil und Pulverpresse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608826A (en) * 1947-10-20 1952-09-02 Haller John Compound hydraulic motor with telescoping pistons
FR2052127A5 (fr) * 1969-07-18 1971-04-09 Basset Jacques
EP0077897A2 (fr) * 1981-10-23 1983-05-04 Dorst Maschinen und Anlagenbau Otto Dorst und Dipl.-Ing Walter Schlegel GmbH & Co. Presse pour fabriquer des articles pressés gardant la mesure à partir de matière pulvérulente
DE9012752U1 (de) * 1990-09-04 1990-11-22 Mannesmann AG, 4000 Düsseldorf Werkzeugadapter für eine Presse zur Herstellung von gestuften, maßhaltigen Preßkörpern

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640325A (en) * 1950-08-12 1953-06-02 Haller John Hydraulic molding press
JPS5380867A (en) * 1976-12-16 1978-07-17 Yoshitsuka Seiki Kk Die set for powder compacting press
DE4000423C2 (de) * 1990-01-09 1998-10-08 Dorst Masch & Anlagen Presse zur Herstellung maßhaltiger Preßlinge aus pulverförmigem Material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608826A (en) * 1947-10-20 1952-09-02 Haller John Compound hydraulic motor with telescoping pistons
FR2052127A5 (fr) * 1969-07-18 1971-04-09 Basset Jacques
EP0077897A2 (fr) * 1981-10-23 1983-05-04 Dorst Maschinen und Anlagenbau Otto Dorst und Dipl.-Ing Walter Schlegel GmbH & Co. Presse pour fabriquer des articles pressés gardant la mesure à partir de matière pulvérulente
DE9012752U1 (de) * 1990-09-04 1990-11-22 Mannesmann AG, 4000 Düsseldorf Werkzeugadapter für eine Presse zur Herstellung von gestuften, maßhaltigen Preßkörpern

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003059608A1 (fr) * 2002-01-15 2003-07-24 Hawk Precision Components Group, Inc. Outil de forage servant au compactage de materiaux particulaires
CN103612410A (zh) * 2013-11-22 2014-03-05 淮南唐兴液压机械有限责任公司 一种液压机
CN112644070A (zh) * 2020-12-28 2021-04-13 陕西兴盛新材料股份有限公司 一种双层嵌套自定位模具及其电极脱模工艺方法
CN112644070B (zh) * 2020-12-28 2022-09-20 陕西兴盛新材料股份有限公司 一种双层嵌套自定位模具及其电极脱模工艺方法

Also Published As

Publication number Publication date
ATE138317T1 (de) 1996-06-15
DE59302669D1 (de) 1996-06-27
DE4227640A1 (de) 1994-02-24
EP0586028B1 (fr) 1996-05-22

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