US3224241A - Underreach prestretch fixture and combination thereof with drawing die press - Google Patents

Underreach prestretch fixture and combination thereof with drawing die press Download PDF

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Publication number
US3224241A
US3224241A US348011A US34801164A US3224241A US 3224241 A US3224241 A US 3224241A US 348011 A US348011 A US 348011A US 34801164 A US34801164 A US 34801164A US 3224241 A US3224241 A US 3224241A
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US
United States
Prior art keywords
ram
elevator
carriage
path
power means
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
US348011A
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English (en)
Inventor
Stanley M Dolney
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.)
Cyril Bath Co
Original Assignee
Cyril Bath Co
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 Cyril Bath Co filed Critical Cyril Bath Co
Priority to US348011A priority Critical patent/US3224241A/en
Priority to NL6502512A priority patent/NL6502512A/xx
Priority to FR7243A priority patent/FR1425766A/fr
Priority to AT171565A priority patent/AT259338B/de
Priority to BE660331D priority patent/BE660331A/xx
Priority to CH279765A priority patent/CH431436A/de
Priority to GB8610/65A priority patent/GB1076071A/en
Application granted granted Critical
Publication of US3224241A publication Critical patent/US3224241A/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
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • B21D25/02—Working sheet metal of limited length by stretching, e.g. for straightening by pulling over a die

Definitions

  • the present structure has to do with a different arrangement of the stretch forming units, particularly the gripping heads and their supports, whereby they can be disposed readily in selected positions within the die space beneath the ram relatively close to the midportion of the space in the tensioning dimension, so as to cooperate with dies which are narrow in said dimension, and can be moved or withdrawn from that position to positions to the outside of the die space, selectively, for forming stock on dies which are substantially coextensive with the die space in that dimension or extend therebeyond.
  • Another specific object is to eifect a better distribution of stresses so as to reduce tendencies toward binding of the mechanism for moving the gripping heads.
  • FIGURE 1 is a top plan view of an apparatus embodying the principles of the present invention.
  • FIG. 2 is a front elevation of a structure illustrated in FIG. 1;
  • FIG. 3 is a hydraulic diagram for the structure.
  • the apparatus comprises a base 1 on which is provided the suitable bed or bolster 2, having a horizontal upwardlyfacing supporting face on which a male die D may be supported for cooperation with a complementary die D on the ram of the press.
  • the press is provided with upright corner posts 3 which guide the platen or rain 4 for vertical movement parallel to its starting position.
  • the platen 4 is adapted to carry the female die D for die drawing cooperation with the male die on the bed upon closure of the dies.
  • the ram 4 is driven by suitable piston rod 5 of a piston 6 operable in a hydraulic cylinder 7 of a reversible hydraulic piston and cylinder assemblage 7a mounted in an upper head 8 supported by the posts 3.
  • the head 8 also supports a conventional electric motor, hydraulic pump, and control valves for effecting operation of the ram.
  • the frame portions 10 are aligned with each other and with the bolster 2.
  • Each portion has horizontal parallel slideways 12 on which is mounted a saddle 13 for movement in a horizontal lineal path toward and away from the path of the dies.
  • a suitable rack 14 is provided on the portion 10 and is engaged by a pinion 15 driven through suitable gearing by hydraulic motors 16 on the saddle 13, for moving the saddle to predetermined adjusted positions lengthwise of the slideways 12.
  • the drive between the pinion and hydraulic motor 16 is preferably self-locking.
  • Suitable T-slots 17 are provided on each portion 10 in a position to receive bolts 18 carried by the 3,224,241 Patented Dec.
  • 19t55 has a horizontal slide portion 23 mounted in the guideways 20 for sliding therealong and has an upright pedestal portion 24 at the end nearest the die path.
  • the pedestal portion 24 is provided with upright guideways 25 spaced laterally of the stretching direction.
  • An elevator 26 is mounted for vertical reciprocation relative to the carriage 22 in the guideways 25.
  • the elevator 26 has integral spaced arms or portions 27 which protrude in a direction toward the midportion of the die space a considerable distance beyond the pedestal so that though the pedestal 24 is outside of the path of the ram 4, the inner ends of the elevator arms 27 can be very close to the midportion of the die space in the stretching direction.
  • a jaw carrying yoke 29 Rockably mounted on suitable shafts 28 journaled in the forward end of the arms 27 is a jaw carrying yoke 29, the yoke being supported for rocking movement about a horizontal axis extending transversely of the path of the carriage 22 and of the elevator 26.
  • the yoke 29 carries a composite gripping jaw 30 which is open and closed by a suitable hydraulic piston and cylinder assemblage 31, which includes a plurality of units such as described in the above patent.
  • the yoke 29 and jaws 30 are so arranged that the jaws can be advanced to a position very close to the center of the die space in a direction endwise of the slideways 12 while the carriage 22 remains outside of the die space.
  • the structure can be used for operating on dies of various dimensions in the stretching direction.
  • the jaws 30 can be positioned so that they can grip the ends of the sheets outwardly beyond the platen, if desired, and in intermediate spaces in between these inner and outer positions.
  • suitable piston and cylinder assemblages 35 each including a cylinder 36, are provided, mounted in brackets on the saddle 13 at the opposite sides of the saddle.
  • Each assemblage includes a piston 37 having a piston rod 38 connected to the car 'riage 22.
  • the carriage 22 is provided with a pair of reversible hydraulic piston and cylinder assemblages 40, each assemblage comprising a cylinder 41 mounted on the pedestal 24 and in which is reciprocable a piston 42 having a piston rod 43 connected to the elevator 26.
  • a distinct advantage of this arrangement is a better distribution of stresses.
  • the force on the jaws in the tensioning dimension is usually much greater than the downward force applied to the elevator.
  • the carriage slide portion 23 and saddle guideways 22 are ample space to make the carriage slide portion 23 and saddle guideways 22 as long as desired without interfering with die operation, so as to better withstand turning moments, due to tensioning force's, tending to rock the carriage about a transverse horizontal axis.
  • the lesser turning moment imposed by the forces lowering the elevator can be withstood readily by the shorter upright guideway 25. But even this latter guideway can be made as long vertically as necessary.
  • the shafts 28 of the yoke 29 carry suitable crank arms 45.
  • Each crank arm is connected to a piston and cylinder assemblage 46, including a cylinder 47 in which is reciprocable a piston 48 having a piston rod 49 pivotally connected to the associated crank arm 45.
  • suitable power means are provided as best illustrated in FIG. 3.
  • These power means comprise the piston and cylinder assemblage for operating the ram 4.
  • Such are connected in a hydraulic circuit, through a combined stop and reversing valve 50, to a hydraulic pump 51 driven by an electric motor 52.
  • a flow regulator 53, driven by a control motor 54, and a pressure regulator 55, are connected in series between the pump and the valve 50 for controlling the rate of flow and the pressure of the fluid supplied for operating the press.
  • the pressure fluid is supplied by a suitable pump 57 driven by a motor 58.
  • One pressure line from the pump 57 leads to a pressure regulator 59 operated by a control motor 60.
  • the line leads to a flow regulator 61 driven by a motor 62 by which pressure fluid is supplied to a solenoid operated reversing stop valve 63 which controls admission of fluid to opposite ends of the elevator piston and cylinder assemblage 40.
  • a by-pass line 64 leads to a flow regulator 65 driven by a control motor 66.
  • the flow regulator supplies pressure fluid to the inlet side of the solenoid operated reversing stop valve 67 which controls the piston and cylinder assemblage 46 for rocking the jaws.
  • a bypass line 69 Leading from the pressure side of the pump 57, at a point between the pump and pressure regulator 59 is a bypass line 69 which leads through a settable pressure regulator 70 driven by a control motor 71 to a solenoid operated reversing stop valve 72 which controls the flow of pressure fluid to the assemblage 35, as illustrated.
  • Another by-pass line 73 leads from between the pressure side of the pump and the pressure regulator 70 to a suitable pressure regulator 74 driven by a motor 75.
  • the flow from the pressure regulator 74 is delivered to the inlet side of a solenoid operated reversing stop valve 76 which controls the operation of the assemblage 31 for opening and closing the jaws.
  • the carriages 22 can be retracted by the assemblages 35, and the jaws 30 opened to receive the opposite margin of the sheet to be gripped by the jaws, whereupon the assemblages 31 are operated to clamp the jaws onto the sheet.
  • fluid pressure is applied to move the carriages 22 relatively away from each other to apply yieldable tension to the stock to stress it above the elastic limit.
  • the elevators 26 are in raised position, opposite from the lower position shown in FIG. 2. After the stock is stretched, the elevators are lowered to effect a partial wrapping of the stock about the male die and at the same time the ram is operated so that the female die is being lowered.
  • the jaws 30 can be rocked by the assemblages 46 during their lowering operation, depending upon the configuration of the die. Lowering of the ram continues until the stock, while held under tension by the jaws, is formed by cooperation of the male and female dies, after which tension is released and the ram then raised to free the workpiece. Upon raising the ram, the elevators 26 are raised so that the jaws operate to strip the workpiece from the male die and hold it thereabove in a position for ready removal from the press.
  • the jaws 30 can be positioned almost at the midportion of the platen for very narrow dies and at the same time can be moved out of such position so that, in their most outward operating positions, they are outside of the path of the dies. Any number of intermediate operating positions are obtainable, thus providing a very flexible and practical structure.
  • the horizontal component of tensioning force applied to the jaws is normal to the vertical guideways 25 and imposes no turning moment on the elevator 26 relative to its guideways. The only turning moment imposed by such horizontal component is on the carriage 22.
  • a ram movable along an upright path, ram power means for driving the ram, a frame at one side of the ram path, a carriage mounted on the frame for movement relative thereto in opposite directions transversely of said ram path along a fixed horizontal path, an elevator mounted on the carriage for movement relative to the carriage along an upright path to raised and lowered positions, selectively, elevator power means interconnecting the carriage and elevator for moving the elevator to said positions, selectively, a stock gripper mounted on the elevator, yieldable stretch power means interconnecting the frame and carriage for yieldably urging the carriage, and thereby the elevator and gripper, along said horizontal path in a direction away from said ram path, and said ram power means, elevator power means, yieldable stretch power means each being operable independently of the others for effecting said movements of the gripper, ram, and elevator independently of each other, and stock gripping means at the opposite side of the ram path.
  • said carriage includes an upright guideway for the elevator and which guideway can be positioned adjacent to, but outside of, the ram path by movement of the carriage forwardly toward the ram path to a predetermined position
  • said elevator has a guide portion which is mounted on said upright guideway and supports said elevator for said movement along its upright path, and an arm portion is carried by said guide portion and extends forwardly therefrom so as to be positioned in the path of the ram in said predetermined position of the carriage, and said gripper is mounted on the forward end of said arm portion

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Press Drives And Press Lines (AREA)
US348011A 1964-02-28 1964-02-28 Underreach prestretch fixture and combination thereof with drawing die press Expired - Lifetime US3224241A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US348011A US3224241A (en) 1964-02-28 1964-02-28 Underreach prestretch fixture and combination thereof with drawing die press
NL6502512A NL6502512A (de) 1964-02-28 1965-02-26
FR7243A FR1425766A (fr) 1964-02-28 1965-02-26 Presse d'emboutissage combinée avec un dispositif de pré-contrainte en tension
AT171565A AT259338B (de) 1964-02-28 1965-02-26 Mit Vorspanneinrichtungen versehene Ziehpresse
BE660331D BE660331A (de) 1964-02-28 1965-02-26
CH279765A CH431436A (de) 1964-02-28 1965-03-01 Ziehpresse mit Vorstreckeinheiten
GB8610/65A GB1076071A (en) 1964-02-28 1965-03-01 Underreach prestretch fixture and combination thereof with drawing die press

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US348011A US3224241A (en) 1964-02-28 1964-02-28 Underreach prestretch fixture and combination thereof with drawing die press

Publications (1)

Publication Number Publication Date
US3224241A true US3224241A (en) 1965-12-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
US348011A Expired - Lifetime US3224241A (en) 1964-02-28 1964-02-28 Underreach prestretch fixture and combination thereof with drawing die press

Country Status (7)

Country Link
US (1) US3224241A (de)
AT (1) AT259338B (de)
BE (1) BE660331A (de)
CH (1) CH431436A (de)
FR (1) FR1425766A (de)
GB (1) GB1076071A (de)
NL (1) NL6502512A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3266284A (en) * 1964-03-05 1966-08-16 Cyril Bath Co Combined drawing die press and stretch forming apparatus
US3575031A (en) * 1968-07-25 1971-04-13 Sheridan Gray Inc Stretch-forming machine with stress-isolated base
US3595057A (en) * 1969-04-15 1971-07-27 Cyril Bath Co Stretcher for stretch forming sheet and plate stock
US3597955A (en) * 1969-01-13 1971-08-10 Cyril Bath Co Apparatus for stretch drawing sheet stock under controlled tension
US4091938A (en) * 1975-08-01 1978-05-30 Ab Carbox Device for handling large workpieces
JPS5614031A (en) * 1979-07-16 1981-02-10 Toyo Koki:Kk Drawing press machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992011154A1 (en) * 1990-12-17 1992-07-09 Ab Volvo Wheel spindle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850071A (en) * 1954-10-18 1958-09-02 Daniel W Kraybill Method and apparatus for stretchforming metal and controlling direction of pull
US2961028A (en) * 1960-03-17 1960-11-22 Cyril John Bath Method and apparatus for combined stretch and die forming of metal stock
US3113607A (en) * 1960-12-19 1963-12-10 Cyril Bath Co Prestretch forming fixture for drawing die press
US3116780A (en) * 1962-02-14 1964-01-07 Cyril Bath Co Prestretch fixture and combination thereof with drawing die press

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850071A (en) * 1954-10-18 1958-09-02 Daniel W Kraybill Method and apparatus for stretchforming metal and controlling direction of pull
US2961028A (en) * 1960-03-17 1960-11-22 Cyril John Bath Method and apparatus for combined stretch and die forming of metal stock
US3113607A (en) * 1960-12-19 1963-12-10 Cyril Bath Co Prestretch forming fixture for drawing die press
US3116780A (en) * 1962-02-14 1964-01-07 Cyril Bath Co Prestretch fixture and combination thereof with drawing die press

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3266284A (en) * 1964-03-05 1966-08-16 Cyril Bath Co Combined drawing die press and stretch forming apparatus
US3575031A (en) * 1968-07-25 1971-04-13 Sheridan Gray Inc Stretch-forming machine with stress-isolated base
US3597955A (en) * 1969-01-13 1971-08-10 Cyril Bath Co Apparatus for stretch drawing sheet stock under controlled tension
US3595057A (en) * 1969-04-15 1971-07-27 Cyril Bath Co Stretcher for stretch forming sheet and plate stock
US4091938A (en) * 1975-08-01 1978-05-30 Ab Carbox Device for handling large workpieces
JPS5614031A (en) * 1979-07-16 1981-02-10 Toyo Koki:Kk Drawing press machine

Also Published As

Publication number Publication date
NL6502512A (de) 1965-08-30
FR1425766A (fr) 1966-01-24
AT259338B (de) 1968-01-10
CH431436A (de) 1967-03-15
GB1076071A (en) 1967-07-19
BE660331A (de) 1965-06-16

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