US3771930A - Hydraulic press for compacting metal powder - Google Patents

Hydraulic press for compacting metal powder Download PDF

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Publication number
US3771930A
US3771930A US00278781A US3771930DA US3771930A US 3771930 A US3771930 A US 3771930A US 00278781 A US00278781 A US 00278781A US 3771930D A US3771930D A US 3771930DA US 3771930 A US3771930 A US 3771930A
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United States
Prior art keywords
sleeve
piston
press
press cylinder
piston rod
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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.)
Expired - Lifetime
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US00278781A
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English (en)
Inventor
S Ginzel
P Niederhuber
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BUSSMANN W KG
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BUSSMANN W KG
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Publication date
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    • 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

Definitions

  • ABSTRACT A hydraulic metallic powder press including a press cylinder and a piston displaceable in the press cylinder.
  • a piston rod is connected to the piston and a seal positioned adjacent the piston rod and at a location where the piston is led out of the press cylinder.
  • a free end of the rod bears a die and is adapted to be introduced into a cavity for compacting metallic powder contained therein.
  • An adjustable sleeve is provided in the press cylinder inwardly of the seal. The sleeve at least partially encloses the piston rod and has an external thread and the press cylinder has an internal thread in mating relationship with the sleeve thread.
  • the sleeve further has a slide.
  • a rotatable gland at least partially encloses the sleeve and has a longitudi' nal groove therein for guiding the slide.
  • the groove runs in the axial direction of the piston rod and a drive motor is operatively coupled for rotatably moving the gland. Accordingly, the length of the stroke of the die into the cavity is thereby limited.
  • the present invention is concerned with a hydraulic metal powder press in which a press cylinder has been placed within a machine frame.
  • a piston on which a pressure medium acts is guided in such a way that it can be moved to and fro.
  • the piston has a piston rod which leads tightly out of the cylinder, and the free end of which supports a pressing table or pressing plate, to which a press die has been attached.
  • the press die is shaped in accordance with the form of the pressing to be manufactured and is introduced into a shaping cavity of a pressing tool which is filled with metal powder, when the piston rod is extended, so that the metal powder will be compacted to a pressing, under high pressure.
  • the precision of the dimensions of pressings manufactured in this way depends on how precisely the stroke of the piston supporting the press die can be circumscribed during the pressing process.
  • the height of lift is circumscribed by adjustable stops that are arranged within the machine frame.
  • the stops have been mounted on supporting columns and their position can be adjusted very finely by way of worn gears. But, this has the disadvantage that dust, in particular metal dust, collects on the stops, whereby the precision of the stroke limitation of the piston will suffer, unless the stops are carefully kept clean at all times.
  • a sheet-metal press is also known, in which the stroke limitation of the piston is achieved by means of stop rings which lie within the press cylinder, and which can be screwed, from the outside, into the press cylinder far (Swedish Pat. No. 204,205).
  • the adjustment of those stop rings takes place by means of a snail and of a worm gear that is joined rigidly with the stop rings.
  • the snail and worm gear In order to maintain the snail and worm gear in such a position that they engage one another, when the stop rings are displaced into the press cylinder or out of it, the
  • FIG. 1 is a schematic longitudinal section through an upper press cylinder of a hydraulic metal powder press in accordance with the invention
  • FIG. 2 is a sectional view from above of a pressing table, taken along the line 22- in FIG. 3, and
  • FIG. 3 is a lateral view of. the upper press cylinder and of the parts mounted underneath it, in accordance with the present invention, as viewed from the same direction as the longitudinal section in accordance with FIG. 1.
  • a geared electric engine 1 drives, by way of a driving shaft, a snail 2 which mates with a worm gear 3.
  • the worm gear 3 is connected in such a way that it will rotate a rotatable gland 5 that is pivoting in a cylinder bottom 4 of a press cylinder 9 (FIG. 1).
  • the inside of the rotatable gland 5 has an axial longitudinal groove 21 in which a slide 6 is guided, which is attached to the lower part of a stop-sleeve 7.
  • the stop'sleeve 7 has been designed in one part for smaller presses, but for larger presses, it has been designed in two parts, as shown here.
  • the division in two parts has the advantage that a shaft packing 8 can be inserted at the joint between the two parts of the stop sleeve 7.
  • the upper part of the stop-sleeve 7 has been screwed into a corresponding thread of the press cylinder 9, by means vof a buttress thread 22, and its height can be modified by turning the stop-sleeve 7.
  • the shaft supporting the snail continues as a worm shaft 11 for an additional snail 12, which mates with an additional worm gear 13 (FIG. 2).
  • the additional worm gear 13 is joined in such a way that it will rotate a wormgear spindle 14, as may be seen in FIG. 3, and rotates it when the engine 1 is running.
  • the worm-gear spindle 14 is supported by bearings 14a and 14b, which are mounted on the press cylinder 9, so that it can rotate.
  • a micro-limit switch 15 is screwed on the wormsnail has to be supported in such a way that it may be shifted at a right angle to its longitudinal axis. This support that can be shifted, and the corresponding design of the snail are complicated.
  • Another purpose of this invention consists in the creation of a hydraulic metal powder press with a stroke limit for the press plunger, in which the stop constituting the limit supports a worm gear which can be driven by a snail placed in the machine frame, so as to be stationary.
  • a further aim of the invention is to create a hydraulic metal powder press with a stroke limit for the press plunger, by means of which the press plunger is supported evenly and symmetrically within the frame of the machine.
  • a sliding bar 16 is rigidly attached to the pressing table 22 (e.g. screwed to it).
  • This sliding bar 16 freely penetrates through an opening 23 of a base plate 24, in which the bearing 14b of the worm-gear spindle 14 has been mounted.
  • a sleeve 25 has been attached, through which the sliding rod 16 also projects, and in which it is guided in such a waythat it is parallel to the worm-gear spindle 14.
  • a stop pin 17 has been fastened to the sliding rod 16; the path of motion of the stop pin 17 agrees with the path of motion of the micro-limit switch 15 so that it may meet it during an approach.
  • the distance between the stop pin 17 and the micro-limit swtich 15 is adjusted before the start of the operation of the hydraulic metal powder press in such a way that it is equal to the distance between the lower surface of the piston 9a and the upper stop face of the stop-sleeve 7.
  • limit switches 19 and 20 which lie on top of one another in the path of motion of the projection 18, have been mounted; normally, they are closed.
  • an inlet opening a for the pressure medium has been provided at the upper end of the press cylinder 9, above the upper surface of the piston 9a.
  • an outlet opening 10b has been made in the press cylinder 9; it is linked with an outlet duct 10c which is shown by a schematic drawing only and which leads to a reservoir R for the pressure medium; the reservoir is also drawn schematically only.
  • an electromagnetic control valve V has been inserted, which is closed when the piston 9a is not moved, or when the stop-sleeve 7 as will be explained in detail later is not shifted.
  • the electromagnetic control valve V is connected with electric supply lines of the engine 1, in such a way that its magnet is excited simultaneously with the swtiching on of the engine 1 by means of a switch S (FIG. 1).
  • the pressure medium in the outlet duct 100 is under the same pressure that prevails also in the reservoir R. This pressure may be atmospheric pressure.
  • the duct 10c as a supply duct for a pressure medium under pressure, that is fed by a pump which has not been shown so as to bring back the piston 9a from its lower position once more into the upper original position as shown in FIG. 1.
  • an additional valve which has not been shown may be inserted into the duct 10c; this valve establishes, during the return movement of the piston 9a, a connection with the pump which has not been shown.
  • the operation progresses as follows:
  • the switch S (FIGS. 1 and 2) is closed, the electromotor 1 is supplied with current and starts.
  • the snails 2 and 12 will turn and rotate the associated worm gears 3 and 13, respectively.
  • the rotatable gland 5 with the groove 21 will also rotate and, thereby, actuate in addition the stopsleeve 7 by way of the slide 6.
  • the stop-sleeve 7 will be screwed by means of the thread 22 further into the press cylinder 9, or out of it.
  • the worm-gear spindle 14 is rotated, so that the micro-limit switch 15 which is kept from rotating by the projection 18 and the rods 18a, will be moved axially at the same speed as the stop-sleeve 7. Accordingly, its distance from the stop pin 17 changes by the same amount as thedistance between the bottom surface of the piston 9a and the upper stop face of the stop-sleeve 7.
  • the magnet of the magnetic valve V is excited, so that it will open.
  • the stopsleeve 7 is adjusted, by way of the duct 10c to expel the pressure medium out of the press cylinder 9 or to suck it into the press cylinder 9.
  • the magnetic valve will remain open as long as the motor 1 is running, and the stop-sleeve 7 and the micro-limit switch 15 are moved thereby.
  • the switch S is reopened, the engine 1 comes to a stop, and the adjustment motion of the stop-sleeve 7 and of the micro-limit switch 15 is interrupted.
  • the magnetic valve V closes again.
  • the piston 9a can be loaded with the pressure medium.
  • the pressure medium is introduced into the press cylinder by way of the inlet opening 10a, while the magnetic valve V is opened at the same time.
  • the pertinent circuit for the introduction of the pressure medium and for the opening of the magnetic valve V in the outlet duct 10c is well known and does not require any further explanation at this point. Due to the loading with the pressure medium, the piston 9a moves downward from the original position as shown in FIG. 1. In that way, the slide rod 16 which is fastened to the pressing table 22, slides within the aperture 23 and within the sleeve 25, and moves the stop pin 17 toward the micro-limit switch 15.
  • a hydraulic metallic powder press comprising a press cylinder, a piston displaceable in the press cylinder, a piston rod connected to the piston, a seal positioned adjacent said piston rod and ata location where the piston is led out of the press cylinder, a free end of the rod being positioned outside of the press cylinder and being attached to a die which is adapted to be in- I troduced into a cavity for compacting metallic powder contained therein, an adjustable sleeve provided in the press cylinder inwardly of said seal, said sleeve at least partially enclosing the piston rod and having an external thread, said press cylinder having an internal thread in mating relationship with said sleeve thread, the sleeve further having a slide, a rotatable gland at least partially enclosing said sleeve and having a longitudinal groove therein for guiding said slide, said groove running in the axial direction of the piston rod, a drive motor operatively coupled to said gland for rotatably moving said gland whereby said adjustable
  • An hydraulic metallic powder press as in claim 2 further including second and third limit switches for stopping said drive motor when said sleeve has been moved axially a predetermined distance and a cam mounted on said first switch to actuate said second and third limit switches when said sleeve has been moved axially a predetermined distance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Control Of Presses (AREA)
  • Actuator (AREA)
US00278781A 1969-04-24 1972-08-08 Hydraulic press for compacting metal powder Expired - Lifetime US3771930A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1920969A DE1920969B2 (de) 1969-04-24 1969-04-24 Hubbegrenzung in einer hydraulischen Metallpulverpresse

Publications (1)

Publication Number Publication Date
US3771930A true US3771930A (en) 1973-11-13

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ID=5732252

Family Applications (1)

Application Number Title Priority Date Filing Date
US00278781A Expired - Lifetime US3771930A (en) 1969-04-24 1972-08-08 Hydraulic press for compacting metal powder

Country Status (6)

Country Link
US (1) US3771930A (de)
JP (1) JPS5021018B1 (de)
CH (1) CH503534A (de)
DE (1) DE1920969B2 (de)
FR (1) FR2039424B1 (de)
GB (1) GB1294078A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029465A1 (de) * 1979-11-27 1981-06-03 L. SCHULER GmbH Umformpresse mit wenigstens einem Werkzeugpaar
US4575438A (en) * 1980-11-19 1986-03-11 Ohio Machine Company, Inc. Tubeless tire curing method
US4738604A (en) * 1979-10-15 1988-04-19 Ohio Machine Company, Inc. Tubeless tire curing apparatus
US5357844A (en) * 1992-04-07 1994-10-25 L. Schuler Gmbh Run-up control for the pressure cheek in a drawing apparatus
US6435083B1 (en) * 1998-12-15 2002-08-20 Schuler Pressen Gmbh & Co. Kg Press having a plunger adjusting system, particularly for massive forming
US6666316B2 (en) * 2002-03-28 2003-12-23 The Minster Machine Company Hydraulic actuated radial friction clutch/brake
WO2004051093A1 (ja) * 2002-11-29 2004-06-17 Koganei Corporation 流体圧シリンダ
US20070062244A1 (en) * 2003-10-29 2007-03-22 Hermann Good Device to receive tools for the calibration of workpieces and press with such a device
CN105201954A (zh) * 2015-10-14 2015-12-30 大隆机器有限公司 一种前帮机的大座油缸

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH627965A5 (en) * 1978-05-03 1982-02-15 Standard Telephon & Radio Ag Punching machine
EP0025469A1 (de) * 1979-09-17 1981-03-25 Beyeler Machines S.A. Verfahren und hydraulische Einrichtung zum Verstellen der Eindringtiefe des Stempels einer hydraulischen Abkantpresse
DE3541387A1 (de) * 1985-11-22 1987-05-27 Netzsch Maschinenfabrik Presse zum herstellen von formlingen aus pulver- oder granulatfoermigen werkstoffen
WO2009060707A1 (ja) * 2007-11-06 2009-05-14 Koganei Corporation 流体圧シリンダ
CN117025909B (zh) * 2023-10-10 2023-12-19 成都壹佰科技有限公司 一种自动化消除锯片应力的去应力装置及方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2648096A (en) * 1950-11-20 1953-08-11 R H Windsor Ltd Injection molding machine and variable delivery hydraulic pump therefor
US2762078A (en) * 1951-06-28 1956-09-11 Haller John Molding press with adjustable core rod
US3044138A (en) * 1960-01-29 1962-07-17 Florida Tile Ind Inc Automatic tile press
US3062132A (en) * 1960-03-21 1962-11-06 Cleveland Crane Eng Hydraulic press brake
US3080852A (en) * 1961-08-03 1963-03-12 Gen Motors Corp Variable stroke actuator
US3191232A (en) * 1961-12-07 1965-06-29 Haller John Hydraulic compacting press
US3264703A (en) * 1962-12-11 1966-08-09 Gatti Alberto Hydraulically moved control devices of the lower pressing plungers in moulds for tiles and the like objects in ceramic
US3367168A (en) * 1966-06-16 1968-02-06 Engel Equipment Inc Ram height adjustment mechanism for press brakes
US3561063A (en) * 1968-06-24 1971-02-09 Danly Machine Corp Vertically oriented injection molding machine

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2648096A (en) * 1950-11-20 1953-08-11 R H Windsor Ltd Injection molding machine and variable delivery hydraulic pump therefor
US2762078A (en) * 1951-06-28 1956-09-11 Haller John Molding press with adjustable core rod
US3044138A (en) * 1960-01-29 1962-07-17 Florida Tile Ind Inc Automatic tile press
US3062132A (en) * 1960-03-21 1962-11-06 Cleveland Crane Eng Hydraulic press brake
US3080852A (en) * 1961-08-03 1963-03-12 Gen Motors Corp Variable stroke actuator
US3191232A (en) * 1961-12-07 1965-06-29 Haller John Hydraulic compacting press
US3264703A (en) * 1962-12-11 1966-08-09 Gatti Alberto Hydraulically moved control devices of the lower pressing plungers in moulds for tiles and the like objects in ceramic
US3367168A (en) * 1966-06-16 1968-02-06 Engel Equipment Inc Ram height adjustment mechanism for press brakes
US3561063A (en) * 1968-06-24 1971-02-09 Danly Machine Corp Vertically oriented injection molding machine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4738604A (en) * 1979-10-15 1988-04-19 Ohio Machine Company, Inc. Tubeless tire curing apparatus
EP0029465A1 (de) * 1979-11-27 1981-06-03 L. SCHULER GmbH Umformpresse mit wenigstens einem Werkzeugpaar
US4575438A (en) * 1980-11-19 1986-03-11 Ohio Machine Company, Inc. Tubeless tire curing method
US5357844A (en) * 1992-04-07 1994-10-25 L. Schuler Gmbh Run-up control for the pressure cheek in a drawing apparatus
US6435083B1 (en) * 1998-12-15 2002-08-20 Schuler Pressen Gmbh & Co. Kg Press having a plunger adjusting system, particularly for massive forming
US6666316B2 (en) * 2002-03-28 2003-12-23 The Minster Machine Company Hydraulic actuated radial friction clutch/brake
WO2004051093A1 (ja) * 2002-11-29 2004-06-17 Koganei Corporation 流体圧シリンダ
US20050214132A1 (en) * 2002-11-29 2005-09-29 Koganei Corporation Fluid pressure cylinder
US7487708B2 (en) 2002-11-29 2009-02-10 Koganei Corporation Fluid pressure cylinder
US20070062244A1 (en) * 2003-10-29 2007-03-22 Hermann Good Device to receive tools for the calibration of workpieces and press with such a device
US7494330B2 (en) 2003-10-29 2009-02-24 Alvier Ag Pm-Technology Device to receive tools for the calibration of workpieces and press with such a device
CN105201954A (zh) * 2015-10-14 2015-12-30 大隆机器有限公司 一种前帮机的大座油缸

Also Published As

Publication number Publication date
CH503534A (de) 1971-02-28
DE1920969B2 (de) 1975-04-30
FR2039424A1 (de) 1971-01-15
DE1920969A1 (de) 1970-11-05
FR2039424B1 (de) 1973-03-16
JPS5021018B1 (de) 1975-07-19
GB1294078A (en) 1972-10-25

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