Surface generating device suitable for generating a die, mold or fixture surface

• US 5,513,972 A
• Filed: 01/27/1993
• Issued: 05/07/1996
• Est. Priority Date: 01/27/1993
• Status: Expired due to Fees

• Current Assignee: Michigan State University
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Stevenson, Robin, Schroeder, Thaddeus
• Primary Examiner(s): BUSHEY, CHARLES S
• Application Number:
  US08/009,703
• Time in Patent Office: 1,196 Days
• Field of Search: 249/78, 249/79, 249/155, 249/158, 249/161, 264/219, 425/175, 425/195, 425/143, 425/144
• US Class Current: 425/175
• CPC Class Codes: B21D 37/02 Die constructions enabling assembly of the die parts in different ways B21D37/06 takes precedence
• CPC Class Codes: B28B 7/02 Moulds with adjustable parts specially for modifying at will the dimensions or form of the moulded article
• CPC Class Codes: B28B 7/025 the mould surface being made of or being supported by a plurality of small elements, e.g. to create double curvatures
• CPC Class Codes: B29C 33/02 with incorporated heating or cooling means
• CPC Class Codes: B29C 33/04 using liquids, gas or steam tyre moulds with incorporated heating or cooling means using liquids, gas or steam B29D30/0601
• CPC Class Codes: B29C 33/302 Assembling a large number of mould elements to constitute one cavity

Abstract

A device is provided which is capable of generating a surface that at least partially conforms to the contour of an article. The surface is defined by the ends of a number of threaded members which are supported within a suitable support structure. The threaded members are aligned so as to be substantially parallel to and threadably engaged with each other. As a result, rotation of an individual threaded member will cause that threaded member to be longitudinally moved relative to its adjacent threaded members and the support structure, without displacing an adjacent threaded member. The surface can be readily configured manually or automatically to serve as a die or mold cavity when the entire surface has been generated to conform to the entire contour of the article. Alternatively, the surface can be generated so as to provide a suitable fixture surface for supporting and securing a workpiece during a machining or welding operation. Due to its method of generation, the surface can be quickly and repeatedly reconfigured to conform to an article or workpiece having a completely different contour.

Claims

1. A mold for forming an article having a predetermined contour, the mold comprising:

a structural frame member; and

threaded members supported within the structural frame member, each of the threaded members having a thread formed thereon, at least some of the threaded members having a reduced diameter portion, the threaded members being oriented such that adjacent ends of the threaded members define a composite contour on one side of the structural frame member and such that at least some of the reduced diameter portions are adjacent each other so as to define a passage through the mold, the threads formed on each of the threaded members being threadably engaged with the threads of each adjacent threaded member such that longitudinal positioning of an individual threaded member relative to its adjacent threaded members is achieved by rotating the individual threaded member;

whereby appropriate longitudinal positioning of the threaded members relative to their respective adjacent threaded members enables the composite contour defined by the threaded members to substantially conform to the predetermined contour of the article so as to define a mold cavity for forming the article.

2. A mold as recited in claim 1 wherein the passage defines a flowpath through the threaded members for selectively heating and cooling the mold.

3. A mold as recited in claim 2 wherein the passage defines a predetermined flowpath through the threaded members as a result of the threaded members being longitudinally positioned relative to each other and the reduced diameter portions being formed at predetermined longitudinal locations on the threaded members.

4. A mold as recited in claim 1 wherein the threads formed on each of the threaded members have a height which is sufficient to minimize voids between adjacent threaded members.

5. A mold as recited in claim 1 wherein the threaded members are threaded cylindrical rods, the threaded cylindrical rods having substantially the same thread pitch and pitch diameter.

6. A mold as recited in claim 1 further comprising means selectively engagable with each of the threaded members for rotating the threaded members.

7. A mold as recited in claim 1 wherein the threaded members are substantially the same length.

8. A mold as recited in claim 1 wherein the adjacent ends of the threaded members are fused together to form the composite contour.

9. A mold as recited in claim 1 further comprising a metal layer deposited on the adjacent ends of the threaded members so as to define the composite contour.

10. A mold as recited in claim 1 further comprising means for heating at least one of the threaded members.

11. A mold as recited in claim 1 wherein the structural frame member has an interior surface on which threads are formed, and wherein the threads formed on the threaded members located adjacent the interior surface of the structural frame member are threadably engaged with the threads of the interior surface, such that longitudinal positioning of an individual threaded member relative to the structural frame member is achieved by rotating the individual threaded member.

12. A mold for forming an article having a predetermined contour, the mold comprising:

a structural frame member having an interior surface, the interior surface having threads formed therein; and

threaded members supported within the structural frame member, each of the threaded members having a thread formed thereon, at least some of the threaded members having a reduced diameter portion, the threaded members being oriented such that adjacent ends of the threaded members define a composite contour on one side of the structural frame member and such that at least some of the reduced diameter portions are adjacent each other so as to define a passage through the mold, the threads formed on each of the threaded members being threadably engaged with the threads of each adjacent threaded member, the threads formed on the threaded members located adjacent the interior surface of the structural frame member being threadably engaged with the threads of the interior surface, such that longitudinal positioning of an individual threaded member relative to its adjacent threaded members and the structural frame member is achieved by rotating the individual threaded member;

whereby appropriate longitudinal positioning of the threaded members relative to their respective adjacent threaded members enables the composite contour defined by the threaded members to substantially conform to the predetermined contour of the article so as to define a mold cavity for forming the article.

13. A mold as recited in claim 12 wherein the passage defines a flowpath through the threaded members for selectively heating and cooling the mold.

14. A mold as recited in claim 13 wherein the passage defines a predetermined flowpath through the threaded members as a result of the threaded members being longitudinally positioned relative to each other and the reduced diameter portions being formed at predetermined longitudinal locations on the threaded members.