US3654796A - Method and apparatus for stripping container bodies from a reciprocal mandrel - Google Patents

Method and apparatus for stripping container bodies from a reciprocal mandrel Download PDF

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Publication number
US3654796A
US3654796A US20297A US3654796DA US3654796A US 3654796 A US3654796 A US 3654796A US 20297 A US20297 A US 20297A US 3654796D A US3654796D A US 3654796DA US 3654796 A US3654796 A US 3654796A
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US
United States
Prior art keywords
mandrel
container body
ironing
container
air
Prior art date
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Expired - Lifetime
Application number
US20297A
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English (en)
Inventor
Lloyd G Dunn
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.)
Alcoa Corp
Original Assignee
Aluminum Company of America
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Filing date
Publication date
Application filed by Aluminum Company of America filed Critical Aluminum Company of America
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Publication of US3654796A publication Critical patent/US3654796A/en
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    • 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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/06—Stripping-off devices

Definitions

  • ABSTRACT A method and apparatus are provided for stripping container bodies from a reciprocal mandrel in an ironing press at the completion of the ironing stroke, which includes a resilient pad which is positioned adjacent the exit end of the last ironing ring and aligned with the mandrel for abutment of a container body on the mandrel against the pad at the completion of the ironing stroke, and means for introducing compressed gas into the container body being ironed prior to completion of the ironing stroke. The compressed gas in the container will hold the container body against the resilient pad whereby the mandrel may be withdrawn from the container during its return stroke.
  • This invention provides air stripping means for a container body ironing press which includes a resilient pad located adjacent the exit end of the last ironing ring in the press and aligned with the mandrel for abutment of a container body on the mandrel against the pad at the completion of the ironing stroke, and means for introducing pressure into the container body on the mandrel prior to completion of the ironing stroke.
  • the pressure means may include an air pump and a solenoid valve with communication lines to a passageway through the mandrel and into a container body on the end of the mandrel.
  • the solenoid valve is timed to introduce air into the mandrel and container body prior to completion of the ironing stroke, and preferably during movement of the container body through the last ironing ring, so that sufficient air pressure is produced in the container body to hold it against the resilient pad for withdrawal of the mandrel form the container body during the return stroke of the mandrel.
  • the valve may be further timed to shut off the supply of air into the container body prior to complete withdrawal of the mandrel from the body to avoid the formation of objectionable oil mist by the escaping air.
  • Another object of the invention is to provide an improved air stripper for an ironing press to minimize damage to container bodies as they are stripped from the mandrel.
  • a further object of the invention is to provide a resilient pad adjacent the exit end of the last ironing ring in an ironing press and means for introducing a fluid under pressure into a container body on the mandrel to hold it against the pad so that the mandrel can be withdrawn form the container body.
  • FIG. 1 is a schematic drawing of an ironer tool pack assembly and mandrel showing a resilient pad adjacent the exit end of the tool pack, and an air vent and pressure supply system communicating with the mandrel;
  • FIG. 2 is an elevational view in partial cross section showing withdrawal of the mandrel from a container which is supported against the resilient pad.
  • an ironer tool pack assembly 10 is illus trated which comprises two end caps 12 and a plurality of ironing rings and spacers 14 secured between the end caps, and a mandrel 16 for moving a drawn cup 18 through the tool pack assembly to thin and elongate the side wall of the cup and form a container body 20 as disclosed in my U.S. application Ser. No. 20,268, filed Mar. 17, 1970, entitled Drawn and Ironed Containers, and executed and filed concurrently herewith. Also shown in FIG.
  • a stop member 22 adjacent the exit end of the tool pack assembly, and an air system for venting the interior of cup 18 as mandrel 16 is introduced into it, and for introducing compressed air into the container body to strip the body from the mandrel as is hereinafter described.
  • the stop member may take a variety of forms such as a pad 22 of rubber or other viscoelastic material, and preferably is slightly larger in diameter than is the container body and approximately one-half inch or more in thickness.
  • Pad 22 is secured to the ironing press so that the end of the mandrel and a container body on the mandrel will abut against the pad at the completion of the ironing stroke.
  • the resilient pad 22 will be spaced from the exit end of the tool pack a distance not less than the length of the ironed container body. In practice, it has been found that a spacing of one or two inches in excess of the length of the container body works well.
  • the ironing press will be set up so that the mandrel 16, upon completion of its ironing stroke, will project beyond the exit end of the tool pack assembly far enough to carry the ironed container body completely through the tool pack assembly and abut against the resilient pad 22.
  • the air system for the ironing press includes both an air pressure system and a vent system which can be connected alternatively to air line 28 and passageway 26 in mandrel 16 by means of a solenoid valve 24.
  • the pressure system is designed to supply air at a pressure sufficient to produce the required stripping force and with sufficient volume flow to maintain that force during stripping.
  • the pressure system comprises a pressure supply line 30 leading into the solenoid valve 24 and a compressor device 36, and may also include an accumulator tank 34, if desired, to maintain the volume flow of air for a longer period.
  • the vent system is designed to facilitate introduction of the mandrel into a drawn cup and includes a vent line 32 which leads from the solenoid valve 24, a vacuum device 38 and a valve 40 which can be opened to ambient pressure conditions.
  • the solenoid valve 24 is actuated by automatic controls which are timed with respect to the operation of the mandrel to vent the interior of cup 18 as mandrel 16 is moved into the cup, and then to introduce pressure into the container body 20 prior to completion of the ironing stroke.
  • the solenoid valve 24 preferably has an off" position in which the passageway 26 in the mandrel 16 is connected with neither the vent system nor the pressure supply system so that the air can be completely shut off during a portion of the cycle to avoid forming of an oil fog as will be explained.
  • a drawn cup 18 is positioned at the entrance end of tool pack assembly 10 by means not shown, and the mandrel 16 is advanced into the drawn cup.
  • solenoid valve 24 connects the air line 28 and the inside of the cup with the vent line 32.
  • Vent line 32 can either be open to the atmosphere via valve 40 so that air in cup 18 can escape to the atmosphere, or be connected to the vacuum device 38 with valve 40 closed so that the air in the cup can rapidly escape to the vacuum system.
  • the use of a vacuum system is desirable for higher operating speeds to ensure that the air in the cup can quickly escape, or be drawn, from the cup.
  • the solenoid valve 24 s actuated to connected the supply line 28 and the interior of the cup with the pressure line 30 prior to completion of the ironing stroke. This connection will force compressed air into the mandrel 16 and the container body 20 on the end of the mandrel to produce the required stripping force against the end wall of the container. It is important that the stripping force be produced on the container before the mandrel commences its return stroke, but not so early in the cycle that the container would be blown off the mandrel prematurely.
  • the factors which determine the pressure build up in the container such as the pressure and capacity of the supply system, timing of the actuation of the solenoid valve and speed or velocity of the mandrel, are carefully controlled and coordinated to produce'the stripping force at the prior time. For example, with a high air pressure and high rate of air flow, less times is required to produce a particular pressure in a container body, and with a high mandrel velocity less time is available for build up of the stripping pressure.
  • the pressure required fro stripping also depends on a number of factors such as temperature, lubrication, mandrel finish, and container length and diameter, among others. Accordingly, in order to produce the required stripping pressure at the optimum time these factors are all coordinated in the design of the system.
  • the solenoid valve is actuated some time after the mandrel has entered the last ironing ring, and before completion of ironing by such last ironing ring.
  • the required air pressure for stripping the container body from the mandrel will have been produced in the container substantially simultaneously with contact or abutment of the end of the container body against the resilient bumper 22.
  • the mandrel 16 commences its return stroke and withdraws from container 20 as is illustrated in FIG. 2.
  • the air pressure in container 20 holds the container against resilient pad 22 during such withdrawal of the mandrel 16.
  • a pressure of approximately 60 pounds per square inch gauge has been employed for one ironing press, but this may vary by -20 p.s.i.g., or more.
  • Another feature of the invention is the timing of the shut off of air into the mandrel so as to avoid the creation of an objectionable oil fog in the ironing press.
  • the solenoid valve 24 is preferably actuated to shut off the supply of compressed air into the mandrel before the mandrel is completely withdrawn from the container body, but the mandrel is not vented until after it has been withdrawn through the tool pack assembly.
  • the compressed air which is trapped in the container body has sufficient force to complete stripping of the body form the mandrel, and does effect such stripping.
  • mandrel 16 As mandrel 16 makes its return stroke, it will be completely withdrawn from container 20, and the container will be free to fall or drop into a bin or conveyor, not shown, positioned below or around the container. Preferably such conveyor or bin will be positioned sufficiently close beneath the container so that it will fall only a short distance into such device and will not be damaged by the fall.
  • Mechanical strippers 42 may also be provided in the tool pack assembly 10 to strip a container body from the mandrel in the event that the air pressure fails to effect such stripping. The mechanical strippers are a safety measure only, however, and it has been found that in an ironing press of the invention, it is usually not necessary to include the mechanical strippers in the press.
  • the stop member against which the end of the container body is run at the completion of the ironing stroke may be a die which reforms the end wall of the container body.
  • the pressure in the container body will hold the body against the die to effect stripping of the body from the mandrel.
  • Running the end of the container against such an end forming die may assist in the stripping operation because refonning of the container will usually result in relative movement between the side wall of the container and the mandrel. This relative movement helps to free the container body from the mandrel to ensure that the force of the stripping pressure will hold the container body against the stop member.
  • a method of stripping a cup-shaped container body from a reciprocal mandrel in an ironing press comprising the steps of:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US20297A 1970-03-17 1970-03-17 Method and apparatus for stripping container bodies from a reciprocal mandrel Expired - Lifetime US3654796A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US2029770A 1970-03-17 1970-03-17

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US3654796A true US3654796A (en) 1972-04-11

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US20297A Expired - Lifetime US3654796A (en) 1970-03-17 1970-03-17 Method and apparatus for stripping container bodies from a reciprocal mandrel

Country Status (5)

Country Link
US (1) US3654796A (enExample)
DE (1) DE2112881B2 (enExample)
FR (1) FR2083355B1 (enExample)
GB (1) GB1295195A (enExample)
SE (1) SE385793B (enExample)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043168A (en) * 1975-10-17 1977-08-23 Continental Can Company, Inc. Shell control manifold
US4381657A (en) * 1980-05-19 1983-05-03 Rockwell International Corporation Method of removing formed parts from a die
US4502309A (en) * 1980-05-19 1985-03-05 Rockwell International Corporation Method of removing formed parts from a die
US4882924A (en) * 1987-09-15 1989-11-28 Sanshin Industry Co., Ltd. Method and apparatus for manufacturing hollow cylindrical guide roller for magnetic recording tape
US5056350A (en) * 1990-08-06 1991-10-15 Coors Brewing Company Apparatus and method for stripping a workpiece from a supporting device
US12257619B2 (en) 2020-05-28 2025-03-25 Stolle Machinery Company, Llc Forming assembly for bodymaker and bodymaker including same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242901A (en) * 1978-03-20 1981-01-06 Canron Corp. Hydraulic press with integral knockout and stroke control
DE69323333T2 (de) * 1992-08-25 1999-09-09 Mitsubishi Materials Corp. Dosenformvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US601738A (en) * 1898-04-05 stampacchia
US2983366A (en) * 1956-04-25 1961-05-09 Trefileries Et Laminoirs De Pr Hydraulic devices for removing tubes drawn on a long mandrel
US3270544A (en) * 1963-06-26 1966-09-06 Reynolds Metals Co Can forming apparatus
US3406554A (en) * 1965-07-06 1968-10-22 Continental Can Co Apparatus for and method of forming containers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR418493A (fr) * 1909-09-29 1910-12-10 Metallurg De Montbard Aulnoye Perfectionnements au travail des pièces creuses sur mandrin

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US601738A (en) * 1898-04-05 stampacchia
US2983366A (en) * 1956-04-25 1961-05-09 Trefileries Et Laminoirs De Pr Hydraulic devices for removing tubes drawn on a long mandrel
US3270544A (en) * 1963-06-26 1966-09-06 Reynolds Metals Co Can forming apparatus
US3406554A (en) * 1965-07-06 1968-10-22 Continental Can Co Apparatus for and method of forming containers

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043168A (en) * 1975-10-17 1977-08-23 Continental Can Company, Inc. Shell control manifold
US4381657A (en) * 1980-05-19 1983-05-03 Rockwell International Corporation Method of removing formed parts from a die
US4502309A (en) * 1980-05-19 1985-03-05 Rockwell International Corporation Method of removing formed parts from a die
US4882924A (en) * 1987-09-15 1989-11-28 Sanshin Industry Co., Ltd. Method and apparatus for manufacturing hollow cylindrical guide roller for magnetic recording tape
US5056350A (en) * 1990-08-06 1991-10-15 Coors Brewing Company Apparatus and method for stripping a workpiece from a supporting device
US12257619B2 (en) 2020-05-28 2025-03-25 Stolle Machinery Company, Llc Forming assembly for bodymaker and bodymaker including same

Also Published As

Publication number Publication date
SE385793B (sv) 1976-07-26
FR2083355A1 (enExample) 1971-12-17
FR2083355B1 (enExample) 1974-03-22
DE2112881B2 (de) 1977-01-13
DE2112881A1 (de) 1971-09-30
GB1295195A (enExample) 1972-11-01

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