US3247549A - Vacuum forming die construction - Google Patents

Vacuum forming die construction Download PDF

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Publication number
US3247549A
US3247549A US451290A US45129065A US3247549A US 3247549 A US3247549 A US 3247549A US 451290 A US451290 A US 451290A US 45129065 A US45129065 A US 45129065A US 3247549 A US3247549 A US 3247549A
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US
United States
Prior art keywords
templates
contour lines
vacuum forming
lines
breather
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
US451290A
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English (en)
Inventor
Erwin B Kolt
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.)
ThyssenKrupp Budd Co
Original Assignee
Budd 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 Budd Co filed Critical Budd Co
Priority to US451290A priority Critical patent/US3247549A/en
Priority to DE19661604436 priority patent/DE1604436B1/de
Priority to GB4239/66A priority patent/GB1074697A/en
Priority to FR50418A priority patent/FR1469446A/fr
Priority to SE3199/66A priority patent/SE300879B/xx
Application granted granted Critical
Publication of US3247549A publication Critical patent/US3247549A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/30—Moulds
    • B29C51/36—Moulds specially adapted for vacuum forming, Manufacture thereof
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/029—Jigs and dies

Definitions

  • This invention relates to a new and improved vacuum forming die structure employed in the production of panel configurations. More particularly the accurate, simplified structure is produced with less time and cost than prior art structures.
  • a principal object of this invention is to provide a new and improved structure for vacuum forming thermoplastic sheet material.
  • a further object of the present invention is to provide an accurate vacuum forming die made directly from drawings without the necessity of patterns or casting molds.
  • a more specific object of the present invention is to provide a novel vacuum forming die structure having a plurality of bent or formed templates of constant height along the length of the templates as an integral part of the vacuum forming die.
  • FIG. 1 is a plane view of the base support having contour lines drawn thereon;
  • FIG. 2 is a perspective view of the base support showing templates mounted on the contour lines;
  • FIG. 3 is a section in elevation taken at lines 33 of FIG. 2;
  • FIG. 4 is a cross-section taken through a finished vacuum forming die shown mounted on a vacuum box under heat lamps to illustrate forming of a thermo-plastic sheet;
  • FIG. 5 is a section in plane view taken at lines 55 of FIG. 4;
  • FIG. 6 is a perspective view of a portion of a thermoplastic sheet formed by the novel die shown in FIG. 4.
  • a vacuum forming die structure having a base support plate; a plurality of contour lines representative of constant elevation are drawn thereon; a plurality of rectangular sheet metal templates are cut into strips of predetermined height corresponding to contour line elevation and then bent to coincide in shape with the two-dimensional contour lines on the base support plate; duplicate templates are prepared for some of the contour lines, the duplicate pairs are combined as a unit to form breather templates provided with a thin spacer to separate them creating an air space therebetween. Vents are made in the base support along the contour lines and the templates are mounted on the base Ce 3,247,549 Patented Apr. 26, 1966 support plate, then a plastic material is placed into the voids between templates and smoothed to the desired contour. The plastic is then hardened to provide a completed vacuum forming die,
  • Base support 10 of FIG. 1 has drawn thereon a plurality of contour lines 11 preferably representative of lines of constant elevation. However, it may be advantageous to select character lines of varied elevation. Some of the contour lines have apertures 12 through the base support 10 spaced along the contour lines. Since the contour lines 11 are representative of constant elevation they are not necessarily spaced parallel one to another as could occur if character lines are employed.
  • a plurality of templates is prepared by cutting strips to a predetermined height in a shear press.
  • the preferred thin sheet metal templates 13 to 20 vary in height as shown in FIG. 3, but are uniform in height along their individual length.
  • Duplicate templates 21 and 22 are prepared for some of the contour lines as will be explained hereafter.
  • the rectangular shaped sheet metal strips or templates 13 to 22 are bent to coincide with respective ones of the contour lines 11. Pairs of templates 14 and 21, and 16 and 26 are bent to conform to the same contour line.
  • the duplicate pair of templates are nested one against the other with a thin spacer 23 separating them. Flexible adhesive tape has been successfully employed for this purpose.
  • the spacers 23 are arranged in a manner to provide an air space 24 extending from the bottom to the top of the templates.
  • the combined templates with the spacers interposed therebetween become a composite unit of parallel plates referred to hereinafter as a breather strip.
  • the breather strips are mounted on the base support plate in coincidence with the contour lines 11 having apertures 12 spaced therealong.
  • the remaining templates are mounted on the base support coincident with their respective contour lines 11.
  • the breather strips have air spacers communicating directly with the apertures or vents 12.
  • a plastic material 25 is placed into the voids between adjacent templates and/or breather strips. Since the top of the templates are representative surface contour lines it is extremely simple to smooth the plastic material between templates either as a straight line or in conformity with a general sloping contour indicated by the spacing and height of the templates. No special tools or skills are required to achieve a high degree of accuracy in smoothing the plastic material to form a die surface. This is especially true if cont-our lines are selected skillfully. As shown in FIG. 4 an excess of plastic material is employed as a shoulder or support 26 to give stability to the vertically aligned templates.
  • the breather strip formed by templates 14 and 21 occurs at the inner corners of the contour surface.
  • the breather strip formed by templates 16 and 22 also occurs at the concave inflection point or inner corner of the die surface.
  • the breather strip formed by templates 18 and 19 occurs at an inner corner or side shoulder of the die surface.
  • the breather strips are placed at air pockets of the die surface.
  • base support 10 has been placed onto a vacuum box 29. A vacuum is applied to the plenum 30 of the vacuum box from a suitable source.
  • thermo-plastic sheet The illustrated sheet is the center or B-post of a uniside structure of an automobile body.
  • the invention employing breather strips and vented supports has been illustrated withconstant elevation contour lines and formed rectangular templates and/or templates representative -of selected character lines.
  • a device for vacuum forming a sheet of thermoplastic material to a three-dimensional surface comprising:
  • breather strips mounted on said fiat base in coincidence with said contour lines, said breather strips comprising a pair of closely spaced parallel plates, each of uniform height along their respective length having upper edges coinciding with said three-dimensional surface,
  • spacer means separating said pair of parallel plates and providing an air space connecting said apertures with said three-dimensional surface
  • plastic material interconnecting adjacent plates of different breather strips, said plastic material being shaped and hardened to conform to said three-dimensional surface.
  • said spacer means comprises strips of adhesive tape of lesser thickness than said plates of said breather strips.
  • a vacuum forming die comprising,
  • breather strips comprising a parallel pair of said thin fiat templates separatedby said spacer means to provide an air space therebetween
  • a vacuum forming die made by the method comprising the steps of:
  • vent means in said base support connected to said air space

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US451290A 1965-04-27 1965-04-27 Vacuum forming die construction Expired - Lifetime US3247549A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US451290A US3247549A (en) 1965-04-27 1965-04-27 Vacuum forming die construction
DE19661604436 DE1604436B1 (de) 1965-04-27 1966-01-18 Form zum vakuumformen einer plastischen folie
GB4239/66A GB1074697A (en) 1965-04-27 1966-01-31 A vacuum forming die
FR50418A FR1469446A (fr) 1965-04-27 1966-02-21 Matrice de formage par le vide
SE3199/66A SE300879B (fi) 1965-04-27 1966-03-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US451290A US3247549A (en) 1965-04-27 1965-04-27 Vacuum forming die construction

Publications (1)

Publication Number Publication Date
US3247549A true US3247549A (en) 1966-04-26

Family

ID=23791616

Family Applications (1)

Application Number Title Priority Date Filing Date
US451290A Expired - Lifetime US3247549A (en) 1965-04-27 1965-04-27 Vacuum forming die construction

Country Status (5)

Country Link
US (1) US3247549A (fi)
DE (1) DE1604436B1 (fi)
FR (1) FR1469446A (fi)
GB (1) GB1074697A (fi)
SE (1) SE300879B (fi)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276245A (en) * 1979-08-22 1981-06-30 Owens-Corning Fiberglas Corporation Method of making and using molds for longitudinally curved sections of pipe insulation
US20220288839A1 (en) * 2019-08-29 2022-09-15 Honda Motor Co., Ltd. Lamination workpiece molding device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2130957B (en) * 1982-12-01 1986-02-05 Aquaforma Limited Production of wax models

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US380099A (en) * 1888-03-27 Embossing-die
US1387616A (en) * 1921-08-16 Apparatus for making pneumatic inner tubes
US2274060A (en) * 1938-10-31 1942-02-24 United Shoe Machinery Corp Mold and mold making method
US2306732A (en) * 1941-05-08 1942-12-29 Bell Telephone Labor Inc Molding fixture
US2315721A (en) * 1939-06-28 1943-04-06 Otis C Martin Matrix element for making light transmitting screens
US2656570A (en) * 1951-11-15 1953-10-27 Elise F Harmon Plastic matrix for printing resistors
US2664593A (en) * 1949-07-30 1954-01-05 Richard H Prewitt Molding apparatus
US2755510A (en) * 1951-02-28 1956-07-24 Smith Corp A O Method of making profiling machine models
US2968838A (en) * 1959-01-29 1961-01-24 Alan A Hicks Three-dimensional die
US2969544A (en) * 1956-10-31 1961-01-24 Gen Electric Contoured article
US3173177A (en) * 1962-04-17 1965-03-16 Valden Company Apparatus for forming brushes and the like

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US380099A (en) * 1888-03-27 Embossing-die
US1387616A (en) * 1921-08-16 Apparatus for making pneumatic inner tubes
US2274060A (en) * 1938-10-31 1942-02-24 United Shoe Machinery Corp Mold and mold making method
US2315721A (en) * 1939-06-28 1943-04-06 Otis C Martin Matrix element for making light transmitting screens
US2306732A (en) * 1941-05-08 1942-12-29 Bell Telephone Labor Inc Molding fixture
US2664593A (en) * 1949-07-30 1954-01-05 Richard H Prewitt Molding apparatus
US2755510A (en) * 1951-02-28 1956-07-24 Smith Corp A O Method of making profiling machine models
US2656570A (en) * 1951-11-15 1953-10-27 Elise F Harmon Plastic matrix for printing resistors
US2969544A (en) * 1956-10-31 1961-01-24 Gen Electric Contoured article
US2968838A (en) * 1959-01-29 1961-01-24 Alan A Hicks Three-dimensional die
US3173177A (en) * 1962-04-17 1965-03-16 Valden Company Apparatus for forming brushes and the like

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276245A (en) * 1979-08-22 1981-06-30 Owens-Corning Fiberglas Corporation Method of making and using molds for longitudinally curved sections of pipe insulation
US20220288839A1 (en) * 2019-08-29 2022-09-15 Honda Motor Co., Ltd. Lamination workpiece molding device

Also Published As

Publication number Publication date
GB1074697A (en) 1967-07-05
SE300879B (fi) 1968-05-13
FR1469446A (fr) 1967-02-10
DE1604436B1 (de) 1971-06-24

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