US3735631A - Hydraulically powered counter-blow hammer - Google Patents

Hydraulically powered counter-blow hammer Download PDF

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Publication number
US3735631A
US3735631A US00201439A US3735631DA US3735631A US 3735631 A US3735631 A US 3735631A US 00201439 A US00201439 A US 00201439A US 3735631D A US3735631D A US 3735631DA US 3735631 A US3735631 A US 3735631A
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US
United States
Prior art keywords
hydraulic
cylinders
coupling
cylinder
retraction
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.)
Expired - Lifetime
Application number
US00201439A
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English (en)
Inventor
H Schmoll
D Jenke
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.)
Schloemann AG
Original Assignee
Schloemann 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 Schloemann AG filed Critical Schloemann AG
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Publication of US3735631A publication Critical patent/US3735631A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
    • B21J7/20—Drives for hammers; Transmission means therefor
    • B21J7/22—Drives for hammers; Transmission means therefor for power hammers
    • B21J7/34—Drives for hammers; Transmission means therefor for power hammers operating both the hammer and the anvil, so-called counter-tup

Definitions

  • ABSTRACT A hydraulic counter-blow hammer having a hydraulic coupling system for making the tups move in opposite directions and a hydraulic retraction system for retracting the tups prior to a stroke.
  • the hydraulic retraction system is combined with the hydraulic retraction system without there being hydraulic intercommunication between the two systems.
  • Differential pistons are connected to the upper tup and the differential pistons have two working faces moving in two different but co-axial cylinders.
  • One cylinder is in the hydraulic coupling system for coupling the lower tup to the upper tup and the other cylinder is in the hydraulic retraction system for retracting the upper tup.
  • the invention relates to a hydraulically powered counterblow hammer, the hydraulic coupling system (hydraulic coupling means) of which is combined with the hydraulic retraction system (hydraulic retraction means).
  • the hammer has upper and lower movable tool-mounting members (which may be referred to as tups) which move in opposite directions.
  • Counter-blow hammers either operate as fully hydraulic hammers or compress a gas cushion via a hydraulic retraction system.
  • the coupling piston for the lower tool-mounting member includes a differential piston. Hydraulic pressure on the annular face of the piston causes a gas cushion to. be compressed by the upper tup acting through the coupling system.
  • the hydraulic retraction system may also take the form of a separate pair of pistons additional to the two displacement pistons of the hydraulic coupling. However, this arrangement is relatively costly.
  • the present invention provides a hydraulically powered counter-blow hammer having an upper movable tool-mounting member, a lower movable tool-mounting member, hydraulic coupling means for coupling the upperand lower tool-mounting members together for move-. ment in opposite directions, the hydraulic coupling means including first cylinders, hydraulic retraction means for retracting at least one of the tool-mounting members, the hydraulic retraction means including second cylinders, said second cylinders being co-axial with, but not in substantial fluid communication with, respective said first cylinders, and differential pistons connected to the upper toolmounting member, each-differential piston having two parts defining two respective working faces, a first part being received in a respective said first cylinder and forming part of the hydraulic coupling means and a second part being received in a respective said second cylinder and forming part of the hydraulic retraction means.
  • the couplingand retraction means are completely separated from each other.
  • a leak in one system cannot influence the other system, while yet retaining a hydraulic coupling function.
  • the packings in the respective cylinders can be located at the ends and can therefore be stationary. As a result they are not subject to inertial loadings, and are easily replaced.
  • the part of the differential piston which plunges from the upper cylinder into the lower cylinder may be protected from the exterior by an intermediate piece which covers the two cylinder ends, e.g., by an easily removable sleeve.
  • This cylinder arrangement bridges the dead space between the retraction drive for the uppertool-mounting member and the coupling cylinder in the base plate, without additional space being required on the hammer.
  • the packings in the respective cylinders can be located at the ends and can therefore be stationary. As a result they are not subject to inertial loadings, and are easily replaced.
  • the part of the differential piston which plunges from the upper cylinder into the lower cylinder may be protected from the exterior
  • co-axial cylinder arrangement need not increase the height of the hammer.
  • the drawing shows, in diagrammatic form, a vertical counter-blow hammer.
  • Stands 2 are mounted on a base plate 1 and carry a cylinder 3 at their top ends. Connecting lines 5 join the cylinder 3 to gas containers 6 located in the stands 2.
  • a differential piston 7 of the upper tup (upper movable tool-mounting member) slides within the cylinder 3.
  • the cylinder chambers 8 and 8a are connected together so that the tup shaft constitutes the effective piston surface for the gas cushion.
  • the lower tup (lower movable tool-mounting member) 9 slides in guides on the stands 2 (which slides are not shown in detail in the drawing) and rests through a spherically ended pushrod 10 on a piston 11 which plunges into a coupling cylinder 12 arranged in the base plate 1.
  • a coupling cylinder 12 arranged in the base plate 1.
  • To the right and left of the coupling cylinder 12 are provided further vertical axis coupling cylinders 13 and 14, these being located either in the base plate 1 or in the stands 2 which rest thereon.
  • the coupling cylinders 12, 13, 14 are connected together by lines 15.
  • Retraction cylinders 16, 17 are arranged on each of the stands 2, co-axial with and above the respective coupling cylinders 13 and 14. Differential pistons 18 and 19 plunge into the retraction cylinders 16 and 17.
  • the seal between the pistons 18 and 19 and the retraction cylinders 16 and 17 is effected by means of packings 20, 21 provided in the cylinders.
  • Corresponding stationary packings 21, 22 seal the lower piston portions 18a, 19a to the coupling cylinders 13, 14.
  • the space between the coupling and retraction cylinders 13, 16 or 14, 17 which are arranged one above the other is covered by a sleeve 23 which protects the piston portions 180, 19a against the ingress of dirt.
  • the retraction cylinders 16, 17 are connected through lines 24 with a control device (not shown) which is in turn connected to a fluid reservoir and pump or a pressure accumulator (not shown), so that at certain times the fluid located in the retraction cylinders 16, 17 and line 24 is pressurized or relieved of pressure.
  • Pushrods 25 are located between the upper hammer tup (7) and the difierential pistons 18 and 19; both ends of the pushrods 25 are spherical and abut spherical sockets in the differential pistons 18, 19 and in buffer plates on the upper hammer tup (7).
  • the control device (not shown) supplies hydraulic pressure to the lines 24 and thus to the retraction cylinders 16, 17, which hydraulic pressure acts on the annular, differential working faces of the differential pistons 18, 19.
  • the differential pistons 18, 19 move upwards and act through the pushrods 25 to move the upper hammer tup (7) upwards.
  • the upper tup differential piston 7 thus compresses the gas cushions in the gas containers 6.
  • the control device (not shown) now opens ports of sufficiently large cross-section to drain the hydraulic fluid from the retraction cylinders 16, 17.
  • the upper tup (7) is driven downwards by the expansion of the compressed gas cushions in the gas containers 6 while the lower tup 9 is driven upwards through the hydraulic coupling between the coupling cylinders 12, 13 and 14.
  • a hydraulically powered counter-blow hammer having an upper movable tool-mounting member
  • hydraulic coupling means for coupling the upper and lower tool-mounting members together for movement in opposite directions, the hydraulic coupling means including first cylinders,
  • hydraulic retraction means for retracting at least one of the tool-mounting members, the hydraulic retraction means including second cylinders, said second cylinders being co-axial with, but not in substantial fluid communication with, respective said first cylinders,
  • each differential piston having two parts defining two respective working faces, a first part being received in a respective said first cylinder and forming part of the hydraulic coupling means and a second part being received in a respective said second cylinder and forming part of the hydraulic retraction means, and

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Actuator (AREA)
US00201439A 1970-11-25 1971-11-23 Hydraulically powered counter-blow hammer Expired - Lifetime US3735631A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2057958A DE2057958B2 (de) 1970-11-25 1970-11-25 Hydraulisch angetriebener Gegenschlaghammer

Publications (1)

Publication Number Publication Date
US3735631A true US3735631A (en) 1973-05-29

Family

ID=5789075

Family Applications (1)

Application Number Title Priority Date Filing Date
US00201439A Expired - Lifetime US3735631A (en) 1970-11-25 1971-11-23 Hydraulically powered counter-blow hammer

Country Status (6)

Country Link
US (1) US3735631A (fr)
JP (1) JPS518231B1 (fr)
DE (1) DE2057958B2 (fr)
FR (1) FR2115391B1 (fr)
GB (1) GB1336484A (fr)
IT (1) IT941261B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3822579A (en) * 1972-10-24 1974-07-09 V Kononenko High-speed counterstroke hammer
US3857272A (en) * 1971-08-26 1974-12-31 B Voitsekhovsky Counterstroke hammer
US5025652A (en) * 1988-10-17 1991-06-25 Maschinenfabrik J. Dieffenbacher Gmbh & Co. Collet surface structure for a hydraulic high-speed press
US7100485B2 (en) 2001-07-23 2006-09-05 Newell Window Furnishings, Inc. Blind and shade cutting center
CN102688971A (zh) * 2012-06-08 2012-09-26 镇江市锻压机床厂 双缸液压锤
CN102886479A (zh) * 2012-10-26 2013-01-23 常州市立威刀具有限公司 对击联动式模锻装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005028140A1 (fr) * 2003-09-22 2005-03-31 Tomio Shimizu Presse speciale a gravite appliquee

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863343A (en) * 1954-04-15 1958-12-09 Schloemann Ag Counterblow hammers
US2914971A (en) * 1957-05-28 1959-12-01 Lombard Corp Counter-blow forging hammer
US3209578A (en) * 1960-02-11 1965-10-05 Hydraulik G M B H Fa Apparatus for forging ingots into a base material
US3329003A (en) * 1963-11-05 1967-07-04 Nat Res Dev Impulse-forming and like machines
US3429174A (en) * 1965-02-10 1969-02-25 Langestein & Schemann Ag Presses
US3596499A (en) * 1967-10-16 1971-08-03 Langenstein & Schemann Ag Machine for pressure forming and impact forming workpieces

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863343A (en) * 1954-04-15 1958-12-09 Schloemann Ag Counterblow hammers
US2914971A (en) * 1957-05-28 1959-12-01 Lombard Corp Counter-blow forging hammer
US3209578A (en) * 1960-02-11 1965-10-05 Hydraulik G M B H Fa Apparatus for forging ingots into a base material
US3329003A (en) * 1963-11-05 1967-07-04 Nat Res Dev Impulse-forming and like machines
US3429174A (en) * 1965-02-10 1969-02-25 Langestein & Schemann Ag Presses
US3596499A (en) * 1967-10-16 1971-08-03 Langenstein & Schemann Ag Machine for pressure forming and impact forming workpieces

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3857272A (en) * 1971-08-26 1974-12-31 B Voitsekhovsky Counterstroke hammer
US3822579A (en) * 1972-10-24 1974-07-09 V Kononenko High-speed counterstroke hammer
US5025652A (en) * 1988-10-17 1991-06-25 Maschinenfabrik J. Dieffenbacher Gmbh & Co. Collet surface structure for a hydraulic high-speed press
US7100485B2 (en) 2001-07-23 2006-09-05 Newell Window Furnishings, Inc. Blind and shade cutting center
CN102688971A (zh) * 2012-06-08 2012-09-26 镇江市锻压机床厂 双缸液压锤
CN102886479A (zh) * 2012-10-26 2013-01-23 常州市立威刀具有限公司 对击联动式模锻装置

Also Published As

Publication number Publication date
IT941261B (it) 1973-03-01
FR2115391A1 (fr) 1972-07-07
DE2057958A1 (de) 1972-06-08
DE2057958B2 (de) 1978-10-12
DE2057958C3 (fr) 1979-06-13
FR2115391B1 (fr) 1976-03-26
JPS518231B1 (fr) 1976-03-15
GB1336484A (en) 1973-11-07

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