US2664191A - Drawing press - Google Patents

Drawing press Download PDF

Info

Publication number
US2664191A
US2664191A US78765A US7876549A US2664191A US 2664191 A US2664191 A US 2664191A US 78765 A US78765 A US 78765A US 7876549 A US7876549 A US 7876549A US 2664191 A US2664191 A US 2664191A
Authority
US
United States
Prior art keywords
main ram
ram
auxiliary
crank
frame
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
US78765A
Other languages
English (en)
Inventor
May Otto Hermann
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2664191A publication Critical patent/US2664191A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18992—Reciprocating to reciprocating

Definitions

  • This invention relates to drawing presses, and with regard to certain more specific features, to crank drawing presses such as are employed for forming long shells.
  • Present-day drawing presses have several disadvantages, the chief one of which is that drawing progresses at a decreasing drawing speed While the opposite is desirable in order to avoid a punching effect.
  • a second disadvantage is that the pressure required at the beginning of the drawing operation is applied when the driving crank is in its most unfavorable position of greatest reactive lever arm, instead of at a minimum which may be gradually increased.
  • a third disadvantage is that stroke of the press may be more than double the length of the shell, with the result that the ram first travels a substantial distance without doing any work.
  • the end result of the stated disadvantages is a press that is unnecessarily large and expensive in construction, having an unnecessarily low production rate at a given forming speed. yMoreover, the former presses, as a result of the stated disadvantages, have a shorter useful life.
  • the present invention avoids the stated disadvantages without losing any of the other known advantages of drawing presses, by providing an auxiliary ram on the main ram.
  • This auxiliary ram carries the punch and moves it parallel to the axis of motion of the main ram in such a manner that the auxiliary ram performs an independent return and forward stroke superimposed up-on the return and forward stroke of the main ram.
  • the return and forward strokes of the auxiliary ram occur substantially during the retraction of the main ram.
  • Fig. 1 is a vertical section of parts of a drawing press illustrating the significant parts of the invention
  • Fig. 2A is a fragmentary horizontal section taken on line 2-2 of Fig. 1;
  • Fig. 3 is a curve illustrating the coordinated operations of the two rams, the relative positions of the rams with respect to one another and with respect to the drawing ring being also shown in coordination,
  • a press frame which forms a guide 3 for a reciprocating main ram 5.
  • the ram is reciprocated by the action of the usual crank 1 coupled through connecting rod 9, both being shown diagrammatically.
  • I is provided on the frame for a drawing ring I3.
  • a support I5 is also provided for a vertical rack i1.
  • Part of the frame I adjacent to the guide 3 is slotted at I9 to accommodate the motion of a bracket 2
  • the crank 1 rotates anticlockwise, the main ram 5, together with the bracket 2l, is reciprocated up and down.
  • the main ram 5 (which is hollow) is provided with a guide 2,3 for an auxiliary ram 25 which carries a punch 21.
  • the auxiliary ram 25 is notched as shown at 29 to accommodate insertion of a latch 3
  • and 33 constitute releasable coupling or holding means between the main ram 5 and the auxiliary ram 25.
  • This latch is pinned to a bell-crank lever 35 which is pinned at 31 to the bracket 2
  • a second bell-crank lever 39 is pinned at rIII to the bracket 2
  • the bell-crank levers are coupled by means of a link 43.
  • One arm of the bell-crank lever 39 carries a roller follower engaging a cam 41 on a crank disc 48.
  • , 35, 43, 39, 45, 41 may be referred to as coupling means for coupling and decoupling the auxiliary ram 25 relatively to the main ram 5.
  • the crank disc carries a crankpin 49, whichr forms a coupling with a slot 5
  • is located in an oscillating arm or link 55, which is pinned at 51 to the bracket 2
  • the end of the arm is slotted, as shown at 6
  • Parts 53 and 55 may be referred to as cycling means.
  • the crank disc 48 is attached to a journal 65 rotary in the bracket 2 I.
  • This journal has keyed to it, as shown at 69, a ratchet 61.
  • Rotary on the journal 55 is a control gear 1I which meshes with the stationary rack I1.
  • is a pawl 13, which is spring-biased in the usual manner against the ratchet 61.
  • the ratchet carries a notch 15 with which the pawl 13 is engageable.
  • the mechanism 61 and 13 constitutes a one-way clutch between the gear 1I and the crank disc 48.
  • and the operating means 48, 53 and 55 for reciprocating the auxiliary ram 25 are responsive to the upward or retractive movement of the main ram 5, but unresponsive to its downward or advancing movement.
  • Parts I1, 1 I 13, 15 and 61 may therefore be designated as timing.
  • Curve. M is theY
  • the letter P diagrammatically illus-- 4 trates a shell to be drawn.
  • both the main ram 5 and the auxiliary ram 25 are in their lowermost positions at the end of the working stroke, beingr latched together at the moment.
  • both rams 5 and 25 are slightly lifted Without having, however, a relative motion, as indicated by the fact that the curves A and M still coincide with one another.
  • the main ram has moved up more.
  • the auxiliary ram which partakes of the motion of the main ram has, however, an additional retractive motion in the same direction,
  • Fig. 3 the forward or downward operation between 180 and 360 is illustrated in four steps. These steps show that the drawing operation begins immediately after the crank has passed the upper dead center position, which means that the main ram andtheauxiliaryv ram latched thereto advance slowlyduringl this period under best conditions of reactive moment arm. Therefore,the highestworking pressure which the press has to exert is available right at the beginning of the drawing operation, which means that the pressure' is applied under the-most favorable conditions for the work in. hand. In. other words, a violent punching action isy avoided while a desirableaccelerating ⁇ action is obtained.
  • thel stroke of the main ram 5 is much shorter for a given amount ofv clearance attained between thepunch 21 and the drawing ring I3.'
  • the radius of the crank 1 may be about halved.
  • the highest pressure to be exerted upon the shell coincides with the beginning of the dra-wingoperation andV with the best position of the crank. Anyy acceleration thereafter occurs duringbutA notV before, the drawing operation.
  • An auxiliary result is. that the press may be operated athigher speeds and with less wear. Moreover the mechanism iscompact and-reliable.
  • crank arm of' the crank disc 4B intermediate the link pivots 51 and 63 provides for relatively slow retraction of the auxiliary ram 25 and relatively fast advance of this ram, thereby causing maximum retraction of the auxiliary ram to occur near the end of the return stroke of the slide 5.
  • maximum sp-ace is obtained at the correct time for insertion of the work piece (note the fifth step from the left in Fig. 3 and compare the next two steps).
  • a drawing press comprising a frame, a main ram, a crank and a connecting rod for reciproeating the main ram between extended and retracted positions, an auxiliary ram reciprocating with respect to the main ram from extended to retracted positions with respect thereto, supporting means movable with the main ram, a latch mechanism for locking the auxiliary ram in extended position or unlocking it and carried upon said supporting means, an oscillating link pivoted to the support and having an operative connection with the auxiliary ram, a crank and cam on the support, the crank having a slotted connection with said oscillating link and the cam being operative upon said latch mechanism, a ratchet and pawl device operating said crank and cam, and a gear rotatable on the support for operating said ratchet and pawl and cooperating with a rack on the frame, the ratchet and pawl device being inoperative to drive the crank and cam mechanisms during advance of the main ram but being operative to drive them during retraction of the main ram.
  • a drawing press comprising a frame, a main ram, a crank and a connecting rod for reciprocating the main ram between extended and retracted positions while the crank moves between dead center positions, an auxiliary ram reciprocating with respect to the main ram from extended to retracted positions with respect thereto, supporting means movable with the main ram, a latch mechanism for locking the auxiliary ram in extended position or unlocking it and carried upon said supporting means, an oscillating link pivoted to the support and having an operative connection with the auxiliary ram, a crank and cam on the support, the crank having a slotted connection with said oscillating link and the cam being operative upon said latch mechanism, a ratchet and pawl device operating said crank and cam, and a gear rotatable on the support for operating said ratchet and pawl and cooperating with a rack on the frame, the ratchet and pawl device being inoperative to drive the crank and cam mechanisms during advance of the main ram but being operative to drive them during retraction of
  • a drawing press comprising a frame, a main ram guided on the frame for reciprocation, power means for reciprocating the main ram through working and return strokes, an auxiliary ram guided on the main ram for reciprocation thereon between extended and retracted positions, a latch for locking the auxiliary ram in its extended position, an actuating mechanism carried by the main ram and having a driving contact with the frame so as to be reversibly movable upon reciprocation of the main ram, a member having a one-way driving connection with said reversibly movable actuating mechanism and intermittently driven thereby, a latch release mechanism operatively connecting said driven member and the latch adapted to move the latch to unlock the auxiliary ram upon initial return movement of the main ram, and an additional mechanism connecting said driven member and the auxiliary ram adapted in response to one-way movement of said member to retract and advance the auxiliary ram relative to the mainram during a retractive stroke of the latter.
  • a drawing press comprising a frame, a drawing die supported by the frame, a main ram, a driving mechanism adapted to reciprocate the main ram through working strokes toward the die and retractive strokes from it, an auxiliary ram mounted for reciprocation between advanced and retracted positions on the main ram and carrying a working tool for working cooperation with said die when in said advanced position, releasable coupling means movable to lock the auxiliary ram in said advanced position relative to the main ram and to release it, an actuating mechanism operative by the movement of the main ram and adapted to lock said releasable coupling means during substantially the entire working stroke of the main ram and to release said coupling means during a retractive stroke, means controlled by said actuating mechanism adapted to retract and advance the auxiliary ram relative to the main ram during the retractive stroke of the latter, said actuating mechanism being constituted by a supporting bracket xed to and movable with the main ram, a linkage on said
  • A- drawing press comprising a frame, a main ram guided on the frame for reciprocation, power means for reciprocating the main ram through working and return strokes, an auxiliary ram guided on the main ram for reciprocation thereon and with respect thereto between extended and retracted positions, locking means on the main ram and operative in connection with the auxiliary ram for locking the latter in its extended position, an actuating mechanism carried by the main ram and movably cooperating with the frame to lock the auxiliary ram to the main ram throughout said working stroke and to unlock the auxiliary ram during said return stroke, and also to retract the auxiliary ram during an initial part of said return stroke and to advance the auxiliary ram to its extended position during a final portion of said return stroke, said auxillary ramy reciprocating mechanism comprising gear means on the; main ramcooperating with a rack on the frame to assume reversingrotary movements, an actuator which is ratchet driven from said gear means to rotate once upon each return movementrof the main ram, a rs
  • said oscillating linkage comprises an arm pivoted at one end relative to the main ram and connected at the other end to said auxiliary ram, the arm being driven by a crank on the rotary actuator, said crank having a slidingr connection with the arm intermediate said pivot and connection, thereby providing for a relatively slow retraction of the auxiliary ram during a major part ofthe return stroke of the main ram and for relatively fast advance movement during a minor part of saidreturn stroke.
  • a drawing press comprising a frame, a drawing' die supported by the frame, a main ram, a driving mechanism adapted to reciprocate the main ram through Working strokes advancing towardthe die andretractive strokes from it, an auxiliary ram mounted for reciprocation between advanced and retracted positions on the main ram and adapted to carry a working tool for cooperation with said die, coupling means adapted to couple and decouple the auxiliary ram relative to the main ram, cycling means adapted to reciprocate the auxiliary ram with respect to the main ram, and timing means coordinated with movements of the main ram relative to the frame adapted to position said coupling means first to permit coupling of the auxiliary ram to the main ram when the auxiliary ram is in its advanced position relative to the main ram and the main ram is in its retracted position, second to hold coupled the main and auxiliary rams during movement of the main ram toward the die, and third to decouple the auxiliary ram from the main ram only after the main ram starts a retractive

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
US78765A 1948-08-24 1949-02-28 Drawing press Expired - Lifetime US2664191A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH273147T 1948-08-24

Publications (1)

Publication Number Publication Date
US2664191A true US2664191A (en) 1953-12-29

Family

ID=4479113

Family Applications (1)

Application Number Title Priority Date Filing Date
US78765A Expired - Lifetime US2664191A (en) 1948-08-24 1949-02-28 Drawing press

Country Status (3)

Country Link
US (1) US2664191A (de)
CH (1) CH273147A (de)
DE (1) DE972615C (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731140A (en) * 1952-05-23 1956-01-17 May Pressenbau G M B H Drawing press
US2758480A (en) * 1953-03-02 1956-08-14 Square D Co Switch operating mechanism
US3735629A (en) * 1970-06-11 1973-05-29 Standun Apparatus for forming one piece metallic can bodies
US4520967A (en) * 1982-12-20 1985-06-04 Aktiebolaget Amals Mekaniska Verkstad Device for a roll spindle
US4532820A (en) * 1978-06-27 1985-08-06 M. S. Willett, Inc. Motion multiplier apparatus
US5947018A (en) * 1997-08-25 1999-09-07 Unova Ip Corp. Mechanical press with cam drive
US20090013542A1 (en) * 2006-12-29 2009-01-15 Po-Lin Ho Drawing Machine
CN103934294A (zh) * 2013-01-18 2014-07-23 何荣机械股份有限公司 圆棒拉伸机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007620A (en) * 1975-06-11 1977-02-15 Crown Cork & Seal Company, Inc. Metal container forming apparatus
DE102017112771A1 (de) * 2017-06-09 2018-12-13 Mall + Herlan Schweiz Ag Bearbeitungseinrichtung und -Verfahren mit relativ bewegten Werkzeugen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US455248A (en) * 1891-06-30 Mechanical movement
US1443176A (en) * 1920-01-08 1923-01-23 Bliss E W Co Drawing press and reversing mechanism for such presses and similar machines
US2331490A (en) * 1941-12-04 1943-10-12 Menkin Burnett Blanking and forming die

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE598030C (de) * 1931-08-05 1934-12-06 Fritz Singer Dr Rohrstrangpresse mit Kurbelantrieb
DE883582C (de) * 1943-07-29 1953-07-20 Fritz Werner Ag Ziehpresse, insbesondere Kurbelpresse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US455248A (en) * 1891-06-30 Mechanical movement
US1443176A (en) * 1920-01-08 1923-01-23 Bliss E W Co Drawing press and reversing mechanism for such presses and similar machines
US2331490A (en) * 1941-12-04 1943-10-12 Menkin Burnett Blanking and forming die

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731140A (en) * 1952-05-23 1956-01-17 May Pressenbau G M B H Drawing press
US2758480A (en) * 1953-03-02 1956-08-14 Square D Co Switch operating mechanism
US3735629A (en) * 1970-06-11 1973-05-29 Standun Apparatus for forming one piece metallic can bodies
US4532820A (en) * 1978-06-27 1985-08-06 M. S. Willett, Inc. Motion multiplier apparatus
US4520967A (en) * 1982-12-20 1985-06-04 Aktiebolaget Amals Mekaniska Verkstad Device for a roll spindle
US5947018A (en) * 1997-08-25 1999-09-07 Unova Ip Corp. Mechanical press with cam drive
US20090013542A1 (en) * 2006-12-29 2009-01-15 Po-Lin Ho Drawing Machine
US7661285B2 (en) * 2006-12-29 2010-02-16 Elite Machine And Design Ltd. Drawing machine
CN103934294A (zh) * 2013-01-18 2014-07-23 何荣机械股份有限公司 圆棒拉伸机

Also Published As

Publication number Publication date
CH273147A (de) 1951-01-31
DE972615C (de) 1959-08-20

Similar Documents

Publication Publication Date Title
US2664191A (en) Drawing press
JPS5921691B2 (ja) 衝撃プレス
US2278921A (en) Strip stock feed mechanism
US3764244A (en) Apparatus for compacting granular material
US2550063A (en) High-speed metal drawing press
GB1384400A (en) Stamping presses
US2693955A (en) Control unit for stock feed
US2052061A (en) Molding press
US2884119A (en) Fast feeding metal working machine
US2204043A (en) Cold forging machine
US3688715A (en) Reciprocating motion control device
JPS6338035Y2 (de)
US2392138A (en) Stock feeding mechanism
JPS58199636A (ja) ホ−マにおけるパンチ側の押出装置
US2120532A (en) Delivery mechanism of platen printing presses
US2738840A (en) Stamping and shearing machine tools
US3164037A (en) Indexing device
US1949923A (en) Apparatus for forming lugs in thread protectors
US3845680A (en) Hydraulic punch press with mechanism for adjusting stripper
US1334364A (en) Punching-machine
US2972945A (en) Cylinder drive control and safety means
US945550A (en) Drawing-press.
US1748063A (en) Press
US3318762A (en) Retractable eccentric press
US3948135A (en) Machine tool