WO1990009267A1 - Procede et appareil de formation d'article en plastique façonne - Google Patents

Procede et appareil de formation d'article en plastique façonne Download PDF

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Publication number
WO1990009267A1
WO1990009267A1 PCT/US1990/000399 US9000399W WO9009267A1 WO 1990009267 A1 WO1990009267 A1 WO 1990009267A1 US 9000399 W US9000399 W US 9000399W WO 9009267 A1 WO9009267 A1 WO 9009267A1
Authority
WO
WIPO (PCT)
Prior art keywords
plastic material
escape
workpiece blank
dies
die
Prior art date
Application number
PCT/US1990/000399
Other languages
English (en)
Inventor
Bruce A. Moen
Jaroslav F. Pardubicky
Original Assignee
Adolph Coors Company
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 Adolph Coors Company filed Critical Adolph Coors Company
Publication of WO1990009267A1 publication Critical patent/WO1990009267A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/0055—Moulds or cores; Details thereof or accessories therefor with incorporated overflow cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0081—Shaping techniques involving a cutting or machining operation before shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/005—Oriented

Definitions

  • This invention relates generally to the field of forming plastic materials into desired shapes and more specifically to the formation of rigid plastic materials into desired shapes without the intentional addition of heat.
  • thermoplastic materials into a desired shape is that of the plastic pull tabs described in U.S. Patent No. 4,804,104 issued February 14, 1988.
  • One conventional method for forming thermoplastic materials into a desired shape is to load a quantity of pellets into a melter to form the pellets into a liquid which is then forced into an injection mold having the desired shape and then to cool the plastic to produce the shaped article which method involves a relatively long cycle of operation.
  • Another method is to press-brake form or forge the plastic material to its final shape at room temperatures.
  • This invention provides method and apparatus for forming a relatively rigid plastic material into a desired shape by placing a workpiece blank of the plastic material between an upper and a lower die which, when the dies have been moved to a closed position, cooperate to form a cavity having the shape of the product to be formed.
  • the plastic material and the dies are at room temperature during, the forming process. After the workpiece blank is placed between the opened dies, the dies are moved to a closed position during which pressure is applied to the workpiece blank to form it into the desired shaped product.
  • an upper die is mounted for sliding movement in linear directions over a pair of fixedly mounted shafts.
  • a lower die has first and second relatively movable parts. The first part is mounted on a support plate which is fixedly mounted on a base member which is mounted at a fixed location. The pair of shafts are fixedly mounted on the support plate. A pair of spaced apart stop blocks are fixedly mounted on the base member and extend upwardly through openings in the support plate. The second part of the lower die is fixedly mounted on a slide member which is mounted for sliding movement over the pair of shafts. A plurality of resilient means are provided between the support plate and the sliding member to urge the sliding member in a direction toward the upper die.
  • Suitable means are provided to limit the movement of the slidable member in the direction toward the upper die.
  • the second part comprises a first section which cooperates with the first part to provide shearing means and a second section which cooperates with the first part to provide a moulding surface having desired surface contours for the lower die.
  • a continuous strip of plastic material is fed through a continuous passageway between the first and second sections of the second part.
  • the upper die has a moulding surface with surface contours facing the moulding surface of the lower die so that when the upper and lower dies are in a closed position, there is defined a cavity having the shape of the product to be formed thereby.
  • a continuous strip is fed between the first and second sections so that at least a portion thereof is over an opening in the first section.
  • the upper die is moved downwardly so that portions thereof contact the slidable member to move the slidable member downwardly.
  • the portion of the continuous plastic strip moves into contact with the first part so that continued downward movement shears a workpiece blank of proper volume from the continuous strip.
  • the continued downward movement of the slidable member results in the movement of the workpiece blank into the cavity.
  • pressures are exerted on the workpiece blank to form it into the shape of the cavity.
  • At least a pair of escape passageways are formed in the second section for the escape of displaced and excess plastic material from the workpiece blank to provide for controlled orientation of material flow venting. This also has an effect of lowering the forming pressure.
  • the escape passageways are located so that the plastic material flowing into the escape passageways will orient the plastic material in the formed workpiece blank leading into the passageways so as to increase the strength of the plastic material at such locations.
  • An additional escape opening of varying sizes is provided for a controlled escape of additional plastic material.
  • Figs. 1 - 4 are schematic illustrations of the formation of a shaped workpiece blank
  • Fig. 5 is a front elevational view of the preferred apparatus for the invention
  • Fig. 6 is a side elevational view of Fig. 5;
  • Fig. 7 is a top plan view of the lower die
  • Fig. 8 is a cross-sectional view taken on the line 8-8 of Fig. 7 with parts removed;
  • Fig. 9 is a cross-sectional view of a plug means
  • Fig. 10 is a cross-sectional view of a part of the lower die
  • Fig. 11 is a bottom plan view of a first section of the lower die
  • Fig. 12 is a cross-sectional view taken on the line 12-12 of Fig. 11;
  • Fig. 13 is a top plan view of a second section of the lower die;
  • Fig. 14 is a cross-sectional view taken on the line 14-14 of Fig. 13;
  • Fig. 15 is an enlarged cross-sectional view taken on the line 15-15 of Fig. 13;
  • Fig. 16 is a perspective view of the bottom of the upper die
  • Fig. 17 is a bottom plan view of the upper die
  • Fig. 18 is a cross-sectional view taken on the line 18-18 of Fig. 17 with parts removed;
  • Fig. 19 is a side elevational view of a part of the upper die
  • Fig. 20 is a bottom plan view of Fig. 19;
  • Fig. 21 is a cross-sectional view taken on the line 21-21 of Fig. 20;
  • Fig. 22 is a cross-sectional view taken on the line 22-22 of Fig. 20;
  • Fig. 23 is a bottom plan view of a support for the part illustrated in Fig. 19;
  • Fig. 24 is a cross-sectional view taken on the line 24-24 of Fig. 23; and Fig. 25 is a view partially in section showing the mounting of the various parts of the upper die.
  • Figs. 1 - 4 there is schematically illustrated a system for the shaping of a workpiece blank into a shaped product.
  • Fig. 1 there is illustrated an upper die 302 which is fixedly mounted in a slidable plate member 304 which is moved over a pair of spaced apart shafts, described below.
  • the lower die 306 comprises a first part 308 which is mounted at a fixed location, as described below, and a second part 310 which is mounted in a slidable member 312 which also slides over the pair of spaced apart shafts as described below.
  • the second part 310 has a continuous passageway 314 through which a continuous strip 316 of a relatively rigid plastic material, such as polyethylene terephthalate, is moved.
  • a continuous strip 316 has been moved through the continuous passageway 314 until a portion thereof is over the first part 308.
  • the slidable plate member 304 is moved downwardly, as viewed in Figs. 1 and 2, to move the slidable member 312 downwardly so that the portion of the continuous strip 316 contacts the first part 308.
  • the continued movement of the slidable-member 312 causes the first part 308 to apply pressure to the portion of the continuous strip 316 to shear it away to form a workpiece blank 318 and move it into an opening 320 in the second part 310.
  • the downward movement of the slidable plate member 304 and the slidable member 312 is continued so that the workpiece blank 318 is moved and confined between the upper die 302 and the first part 308 of lower die 306.
  • the continued downward movement of the slidable plate member 304 and the slidable member 312 applies pressures to the workpiece blank 318 to reshape the workpiece blank 318. As illustrated in Fig.
  • the upper 302 and lower 306 dies have been moved to a closed position and the workpiece blank 318 has been formed into a shaped product 322.
  • the upper 302 and lower 306 dies are moved to an opened position, Fig. 4, and the shaped product 322 is removed by suitable mechanisms
  • the shaped product 322 is moved through trimming apparatus, which form no part of this invention, so as to remove unwanted portions of the shaped product to form a finished product.
  • the apparatus illustrated in Figs. 5 and 6 comprises a base member 350 having a lower section 352 having a generally rectangularly shaped transverse cross-sectional configuration which is mounted by suitable means, such as headed threaded bolts (not
  • 350 has an integral upper section 356 having a generally rectangularly shaped cross-sectional configuration smaller than that of the lower section 352.
  • a pair of spaced apart stop blocks 358 project upwardly from the
  • a support plate 360 is secured to the upper section 356 by suitable means, such as headed threaded bolts (not shown) and has a pair of spaced apart openings 362 through which the stop blocks 358 pass.
  • suitable means such as headed threaded bolts (not shown) and has a pair of spaced apart openings 362 through which the stop blocks 358 pass.
  • 25 spaced apart shafts 364 are fixedly mounted on the support plate 360 by flange portions 366 and threaded nuts 368.
  • the first part 308 of the lower die 306 is securely mounted at a fixed location on the support plate 360 and extends upwardly therefrom.
  • the slidable member 312 has a pair of bushings
  • the slidable member 312 is resiliently urged upwardly by a plurality of resilient members 372 which extend between and are in
  • the upward movement of the slidable member 312 is limited by a plurality of bolts 374 having head portions 376 adapted to contact abutment surfaces 378 in the slidable member 312 and threaded end portions 380 in threaded engagement with threaded openings 382 in the upper section 356.
  • the first part 308 has an upper portion thereof located in an opening 384 of the slidable member 312 so that the slidable member 312 may move over the first part 308.
  • the second part 310 is secured in the slidable member 312 for movement therewith as described below.
  • the slidable plate member 304 has a pair of bushings 386 mounted therein for permitting sliding movement thereof over the pair of shafts, 364.
  • a block member 388 is secured to the slidable plate, member 304 by suitable means; such as headed threaded bolts (not shown) which block member 388 is firmly secured to a drive shaft 390 which is reciprocated in vertical linear directions by a suitable driving means 392.
  • the upper die 302 is mounted in the slidable plate member 304 as described below.
  • the first part 308 of the lower die 306 is illustrated in Figs. 7 - 10.
  • the first part 308 comprises a base section 400 which has linearly extending sidewalls 402 and semi-circular end walls 404 and which is mounted in a recess 406, Figs.
  • a stem portion 408 projects upwardly from the base section 400 and has an outer peripheral surface 410 defined by the continuous line 412.
  • a surface contour 414 projects upwardly from the upper surface 416 of the stem portion 408.
  • a first opening 418 extends through the stem portion 408 and base section 400 and has an enlarged recess 420 at the bottom portion thereof.
  • a die element 422, Fig. 10 has a body portion 424 adapted to be located in the opening 418 and an enlarged flanged portion 426 adapted to be seated in the reqess 420.
  • the die element 422 is secured to the base section 400 by suitable means, such as headed threaded bolts passing through the flanged portion 426 and secured in threaded openings in the base section 400 (not shown) .
  • a surface contour 428 projects upwardly from the upper surface 430 of the body portion 424 and defines a recess 432 extending downwardly into the body portion 424 to define the rivet portion of the shaped product 322.
  • a second opening 436 extends through the stem portion 408 and the base section 400 and has a reduced section 438 to form an abutment surface 440.
  • a plurality of plug members 442 are provided and have a solid body portion 444 and a hollow threaded portion 446 with an abutment surface 448 adapted to contact the abutment surface 440 when a plug member 442 is placed in the second opening 436.
  • the solid body portions 444 of the plug members 442 have differing axial lengths so as to form different sized additional cavities 450 at the upper portion of the second opening 436.
  • the plug member 442 is secured in the second opening 436 by suitable means such as a headed threaded bolt secured in the threaded portion 446 with the head portion thereof abutting against the recess 452 at the lower portion of the second opening 436.
  • the second part 310 of the lower die 306 is illustrated in Figs. 11 - 15 and comprises a first section 460 illustrated in Figs. 11 and 12 and a second section 462 illustrated in Figs. 13 - 15.
  • the first section 460 has a generally, cylindrical outer surface 464 and a generally planar bottom surface 466 which is adapted to be seated in a recess 468 (Fig. 5) in the slidable member 312.
  • Suitable means such as headed threaded bolts (not shown) passing through openings 470 and secured in threaded openings in the recess 468 are used to secure the first section 460 to the slidable member 312 for movement therewith.
  • the first section 460 has the continuous passageway 314 extending therethrough to provide for the continuous strip 316 of the relatively rigid plastic material.
  • the relatively rigid plastic material comprises a polyethylene terephthalate such as those marketed by Eastman Kodak under the trade designation 7352 and 9921.
  • An opening 472 having a shape corresponding to the outer peripheral surface 410 of the stem portion 408 is formed in the first section 460 so that the workpiece blank 318 and the stem portion 408 may pass therethrough.
  • the second section 462 has a generally cylindrical outer surface 474 and a generally planar surface 476 adapted to be in contact with the generally planar surface 478 of the first section 460.
  • the second section 462 is secured on the first section 460 by suitable means such as headed threaded bolts (not shown) passing through opening 480 in the second section and secured in threaded openings 482 in the first section 460.
  • the second section 462 has an opening 484 formed therein and having a shape corresponding to the outer peripheral surface 410 of the stem portion 408 so that the workpiece blank 318 and the upper portion of the stem portion 408 may pass therethrough.
  • a recessed portion 486 extends outwardly from the opening 484 to provide a space for a portion of the workpiece blank 318 to fill.
  • a pair of spaced apart recesses 488 extend downwardly from the upper surface 490 of the second section 462 and cooperate with portions of the upper die 302 to provide escape passageways for excess portions of the workpiece blank 318 to provide for controlled orientation venting of the plastic material.
  • the recesses 488 are located so that the excess portions flowing into the escape passageways will orient the plastic material in the shaped product 322 leading into the recesses 488 so as to strengthen those portions of the shaped product 322.
  • plastic tabs produced without the.escape passageway required a thickness of about 0.095 of an inch while plastic tabs produced with the escape passageways satisfy the strength requirements with thicknesses of about 0.085 of an inch.
  • the escape passageways 488 are located on opposite sides of a diametrical reference line 489 of the second section 462 so that the portion of the diametrical reference line 489 in the shaped product 322 would overlie the diametrical reference line 32 of the container end member 10 so that the strengthened areas in the shaped product are located where the plastic tab is most highly stressed in applying the pressure to form the opening in the container end member 10. While the greatest increase in strength occurs closer to the escape passageways 488, there is an increase in strength in direction of and throughout the material flow path toward the escape passageways 488.
  • the upper die 302 is illustrated in Figs. 16 -
  • the lower surface 500 of the slidable plate member 304 has a recess 502 in which a removable plate member 504 is secured by suitable means, such as headed threaded bolts (not shown) in the threaded openings 506.
  • suitable means such as headed threaded bolts (not shown) in the threaded openings 506.
  • the bottom surface 508 of the plate member 504 has a recess portion 510 extending upwardly therefrom and a surface contour 512 extending downwardly therefrom.
  • An opening 514 extends through the plate member 504.
  • a die member 516, Fig. 19, has a central body portion 518 having a portion thereof extending through the opening
  • the lower surface 520 of the body portion 518 has a plurality of recesses 522 extending upwardly therefrom to provide a surface contour for the upper die 302.
  • the body portion 518 has an enlarged flange portion 524 having linearly extending sidewalls 526 and semi-circular end walls 528.
  • the die member 516 is mounted in a support member 530, Figs. 23 - 25, having a body portion 532 having a generally cylindrical outer surface 534 and an integral enlarged flange portion 536 having a generally cylindrical outer surface 538 and a generally planar bottom surface 540.
  • a recess 542 having linearly extending sidewalls 544 extends inwardly from the bottom surface 540.
  • An opening 546 extends through the flange portion 536 and the body portion 532. As illustrated in Fig. 25, the body portion 518 of the die member 516 is inserted into the opening 546 until the flange portion 524 is seated in the recess 542 with the linearly extending sidewalls 526 in mating engagement with the linearly extending sidewalls 544.
  • the support member 530 is held in the slidable plate member 304 by the attachment of the slidable plate member 304 to the block member 388.
  • a pin 548 projects outwardly from the block member 388 and is seated in a recess 550 in the support member 530 to prevent rotation of the die member 516.
  • Figs. 5 - 25 functions in the manner described in relation to Figs. 1 - 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

On a mis au point un procédé et un appareil permettant de former une ébauche de pièce à usiner en matière plastique relativement rigide, telle que du téréphtalate de polyéthylène, en un produit (322) façonné désiré. Ledit appareil comprend un moule supérieur (302) comportant des première (308) et seconde (310) parties mobiles cisaillant l'ébauche de pièce à usiner d'une bande continue (316) de la matière plastique relativement rigide, et coopérant avec le moule supérieur (302) pour refaçonner l'ébauche de la pièce à usiner selon la forme désirée. Ladite seconde partie (310) comporte également des passages d'évacuation pour de la matière plastique excédentaire, situés de manière à orienter cette dernière et ainsi augmenter la résistance de ladite matière plastique dans le produit façonné (322). Le produit peut être une patte en plastique servant à appliquer une pression à une partie d'un élément terminal de conteneur, pour y former un orifice.
PCT/US1990/000399 1989-02-13 1990-01-19 Procede et appareil de formation d'article en plastique façonne WO1990009267A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US31060789A 1989-02-13 1989-02-13
US310,607 1989-02-13

Publications (1)

Publication Number Publication Date
WO1990009267A1 true WO1990009267A1 (fr) 1990-08-23

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Country Status (1)

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1910525A (en) * 1929-12-02 1933-05-23 Westinghouse Air Brake Co Mold for cylinder packing
US2045471A (en) * 1936-04-24 1936-06-23 Louis A Kasen Method of producing molded articles from casein
US2224852A (en) * 1938-06-28 1940-12-17 Dow Chemical Co Molding polystyrene and related resins
US2454193A (en) * 1944-06-13 1948-11-16 Western Electric Co Apparatus for molding articles
US3825648A (en) * 1972-07-06 1974-07-23 Itt Forging of rigid crystalline plastics
US4014970A (en) * 1974-04-25 1977-03-29 The Budd Company Solid state forming of thermoplastic material
US4076788A (en) * 1976-12-02 1978-02-28 General Motors Corporation Mold coating of freshly molded articles
US4354996A (en) * 1981-01-09 1982-10-19 Toyo Seikan Kaisha, Ltd. Method for making a plastic container
US4419319A (en) * 1981-08-10 1983-12-06 Ball Corporation Preform structure
US4459092A (en) * 1980-11-29 1984-07-10 Yoshida Industry Co., Ltd. Apparatus for integrally molding an ornament plate on a plastic body
US4540534A (en) * 1983-10-11 1985-09-10 American Optical Corporation Apparatus and method for injection molding lenses
US4562026A (en) * 1984-03-15 1985-12-31 Motorola, Inc. Compression molding against an insert

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1910525A (en) * 1929-12-02 1933-05-23 Westinghouse Air Brake Co Mold for cylinder packing
US2045471A (en) * 1936-04-24 1936-06-23 Louis A Kasen Method of producing molded articles from casein
US2224852A (en) * 1938-06-28 1940-12-17 Dow Chemical Co Molding polystyrene and related resins
US2454193A (en) * 1944-06-13 1948-11-16 Western Electric Co Apparatus for molding articles
US3825648A (en) * 1972-07-06 1974-07-23 Itt Forging of rigid crystalline plastics
US4014970A (en) * 1974-04-25 1977-03-29 The Budd Company Solid state forming of thermoplastic material
US4076788A (en) * 1976-12-02 1978-02-28 General Motors Corporation Mold coating of freshly molded articles
US4459092A (en) * 1980-11-29 1984-07-10 Yoshida Industry Co., Ltd. Apparatus for integrally molding an ornament plate on a plastic body
US4354996A (en) * 1981-01-09 1982-10-19 Toyo Seikan Kaisha, Ltd. Method for making a plastic container
US4419319A (en) * 1981-08-10 1983-12-06 Ball Corporation Preform structure
US4540534A (en) * 1983-10-11 1985-09-10 American Optical Corporation Apparatus and method for injection molding lenses
US4562026A (en) * 1984-03-15 1985-12-31 Motorola, Inc. Compression molding against an insert

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