US3630063A - Deep drawing hydraulic press - Google Patents

Deep drawing hydraulic press Download PDF

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Publication number
US3630063A
US3630063A US842324A US3630063DA US3630063A US 3630063 A US3630063 A US 3630063A US 842324 A US842324 A US 842324A US 3630063D A US3630063D A US 3630063DA US 3630063 A US3630063 A US 3630063A
Authority
US
United States
Prior art keywords
punch
hydraulic
tubular
punches
press
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
US842324A
Other languages
English (en)
Inventor
Victor Marcilger
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.)
STD Services Ltd
S T D SERVICES Ltd
Original Assignee
STD Services Ltd
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 STD Services Ltd filed Critical STD Services Ltd
Application granted granted Critical
Publication of US3630063A publication Critical patent/US3630063A/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
    • 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
    • B21D22/28—Deep-drawing of cylindrical articles using consecutive dies

Definitions

  • the present invention relates to a deep drawing [31] P 17 52 800'6 hydraulic press having a composite telescopic punch, which consists of an inner punch and at least one tubular punch concentrically surrounding the inner punch, in which press [54] ?EE: ?K:: E? PRESS between the hydraulic driving mechanism and the tubular g punches, flexible intermediate members standing under an ini- [52] U.S.Cl 72/349, tial tension and a force transmitting element are arranged,
  • the present invention relates to a deep drawing hydraulic press having a composite telescopic punch which consists of an inner punch and at least one tubular punch concentrically surrounding the inner punch.
  • Deep drawing hydraulic presses having a composite telescopic punch which consist of an inner punch and several for example, three, tubular punches concentrically surrounding the inner punch.
  • the hydraulic drive can be transmitted, for example, by means of sliding crossheads and guides to the individual punches.
  • the press is operated as follows:
  • a workpiece disc that is a piece of sheet metal cut to size, is first placed on a die.
  • the edge of the disc is held on the die by a holddown mechanism.
  • the drawing process which consists of several draws then begins.
  • the outermost tubular punch of the composite punch acts as the drawing punch.
  • the first draw is ended when the front of the drawing punch has reached the next smaller die, which is located under the first mentioned die.
  • a further draw follows, that is, the next tubular punch draws the workpiece through the next smaller die.
  • the outermost tubular punch which has served as the drawing punch of the first draw, thereby acts as a workpiece holddown, and so forth.
  • the force with which the punch is moved is determined by both the resistance of the workpiece and by the speed of drawing.
  • the punch performs no mechanical work.
  • the punch must exert a specified static force on the edge of the workpiece and therefore on the drawing die. If the force is too large or too small, the workpiece may be damaged, for example, wrinkles or cracks may be formed.
  • the holddown force is in every case less than the drawing force. In the case of the known presses the holddown forces is produced hydraulically.
  • the present invention seeks to produce a constant holddown pressure for deep drawing presses of the above discussed type without hydraulic switching parts being required therefor.
  • a deep drawing hydraulic press having a composite telescopic punch, which consists of an inner punch and at least one tubular punch concentrically surrounding the inner punch, in which press between the hydraulic driving mechanism and the tubular punches, flexible intermediate members standing under an initial tension and a force transmitting element are arranged, which during a drawing stroke of the press produce a connection between the driving mechanism and the tubular punches, a stop being provided in the forward path of the composite punches which shortly before the punch reaches a subsequent and smaller die cuts off the hydraulic drive from the respective punch.
  • the intermediate members are springs.
  • Helical springs or plate springs may be used, while tubular pieces may serve as force transmitting elements.
  • the position of the stop is variable.
  • a deep drawing press is shown in an unloaded position to the left-hand side of the figure and in an operating position on the right hand of the figure.
  • a rigid supporting frame has several tables 10, ll, 12 arranged one above the other.
  • Guide columns l4, 15 are mounted on the frame and sliding guides 16, 17 are guided on them.
  • Each tubular telescopic punch of the deep drawing press is fitted to one of the sliding guides.
  • a guiding ring 13 for the composite punch is located in the top table 10 of the frame.
  • a first die is mounted, the inside radius of which is larger than the outside radius of the outermost tubular punch 3 of the composite punch by the desired wall thickness of the workpiece.
  • a holddown mechanism (not shown) is arranged on this plate.
  • further dies 1, 2 are mounted which are associated with the individual punches of the telescopic punch assembly.
  • the telescopic punch has a middle tubular punch 4 and an inner tubular punch 9 in addition to the outermost punch 3.
  • the tubular punches 3, 4 and 9 concentrically surround an inner punch 8.
  • sliding guides 16 and 17 which are associated with the tubular punches 3 and 4 are shown.
  • an individual sliding guide is associated with the inside punch as well as with each of the tubular punches,
  • the sliding guides 16, 17 consist of lateral sliding cylinders l8,
  • the guides 16, 17 are moved by a hydraulic circuit (not shown) and movement of the guides and crossheads causes the individual punches to become loaded.
  • the crossheads 20, 21 are not directly connected to the tubular punches 3, 4 of the punch assembly. Between the crossheads and the tubular punches are located springs and power transmission parts, which during a drawing operation couple the drive with the tubular punches. For this purpose an annular supporting member 22 is located at the top end of the punch 4 as viewed which in turn rests on a ring 23 of the punch 4, for which the type of connection between crossheads and punch is described below by way of example.
  • the crosshead 20 is not rigidly connected with the punch 4, but has in the central part thereof a ring-shaped recess, the edge of which surrounds the end of the punch 4, with clearance.
  • helical springs 6 distributed evenly around the periphery. These are initially compressed by means of a tie rod 26 which connects the intermediate pieces 24, 25 in which the ends of the springs are mounted. All the springs are surrounded by a common housing 28. Inside the'housing 28 the springs 6 are surrounded by tubular thrust pieces 27. The latter are of such a length that in the resting position (on the left hand of the drawing) i.e., when the springs 6 are extended, an intermediate space 30 remains free, The space 30 represents the distance by which the springs 6 can be further compressed.
  • the position of the stop is effected before the tubular punch has reached the die. In this position the hydraulic pressure is then transmitted to the supporting frame.
  • the tubular punch is only affected by the spring compression.
  • the compression of the spring can be accurately adjusted to give the desired holddown force. Small corrections are possible by variation of the stop, for example by intermediate pieces or by threaded parts.
  • each holddown unit being located in a power assembly a hydraulic drawing ram for a respective stage and its drawing punch and being movable between a compressed condition and an extended condition, each holddown unit comprising at least two prestressed elements, at least two force transmission elements peripherally spaced around said drawing punch or punches, a working stroke of said hydraulic ram both transmitting a drawing force from said hydraulic ram through the force transmission elements to the respective stage drawing punch and compressing said prestressed elements in the respective holddown unit, stop means for arresting a working stroke of the hydraulic ram prior to the leading edge of the respective drawing punch arriving at the next subsequent die, to thereby remove the hydraulic ram force from a respective punch so that said

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Forging (AREA)
  • Press Drives And Press Lines (AREA)
US842324A 1968-07-17 1969-07-16 Deep drawing hydraulic press Expired - Lifetime US3630063A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681752800 DE1752800A1 (de) 1968-07-17 1968-07-17 Hydraulische Tiefziehpresse

Publications (1)

Publication Number Publication Date
US3630063A true US3630063A (en) 1971-12-28

Family

ID=5692958

Family Applications (1)

Application Number Title Priority Date Filing Date
US842324A Expired - Lifetime US3630063A (en) 1968-07-17 1969-07-16 Deep drawing hydraulic press

Country Status (11)

Country Link
US (1) US3630063A (de)
AT (1) AT300509B (de)
BE (1) BE736169A (de)
CH (1) CH489358A (de)
DE (1) DE1752800A1 (de)
ES (1) ES369588A1 (de)
FR (1) FR2013142A1 (de)
GB (1) GB1273633A (de)
LU (1) LU59111A1 (de)
NL (1) NL6910577A (de)
SE (1) SE342753B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4405058A (en) 1981-02-13 1983-09-20 American Can Company Container
US4485663A (en) * 1981-02-13 1984-12-04 American Can Company Tool for making container

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1453652A (en) * 1923-05-01 Method and apparatus por eobmiiia sheet-metal articles
US1548457A (en) * 1921-10-21 1925-08-04 Ira N Lind Shell-drawing machine
US3453848A (en) * 1965-06-07 1969-07-08 Dro Eng Co Di Apparatus for deep drawing metal with hydraulically controlled dies
US3470725A (en) * 1966-07-18 1969-10-07 Metal Flo Corp Hydraulic spindle press for drawing metal
US3509754A (en) * 1969-05-28 1970-05-05 Metal Flo Corp Method and apparatus for deep drawing metal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1453652A (en) * 1923-05-01 Method and apparatus por eobmiiia sheet-metal articles
US1548457A (en) * 1921-10-21 1925-08-04 Ira N Lind Shell-drawing machine
US3453848A (en) * 1965-06-07 1969-07-08 Dro Eng Co Di Apparatus for deep drawing metal with hydraulically controlled dies
US3470725A (en) * 1966-07-18 1969-10-07 Metal Flo Corp Hydraulic spindle press for drawing metal
US3509754A (en) * 1969-05-28 1970-05-05 Metal Flo Corp Method and apparatus for deep drawing metal

Also Published As

Publication number Publication date
DE1752800A1 (de) 1971-05-19
GB1273633A (en) 1972-05-10
AT300509B (de) 1972-07-25
NL6910577A (de) 1970-01-20
BE736169A (de) 1970-01-16
SE342753B (de) 1972-02-21
LU59111A1 (de) 1969-11-25
CH489358A (de) 1970-04-30
ES369588A1 (es) 1971-06-01
FR2013142A1 (de) 1970-03-27

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