Patent Application
20060156787
The present invention generally relates to a laminated tool and to a method for forming a tool and more particularly, to a tool which is formed by castably placing a surface finish or forming portion upon a pre-finished or “undersized” tool, and to a method for using this technique or strategy for forming or creating such a tool.
Conventional tooling techniques or strategies typically require the creation of a tool from a relatively solid block of material. It should be realized, at the outset, that the term “tool”, as used in this description, means any item used to create an object or tangible item and is to be construed in the broadest manner possible relative to the types of items or objects that it may create.
While these conventional tooling techniques do usually allow a desired tool to be created, they suffer from some drawbacks. By way of example and without limitation, they are relatively costly and time consuming and the detrimental impact of these disadvantages typically increases in direct proportion to the size and/or complexity of the created tool.
One approach to overcome these difficulties involves the use of a plurality of sectional members which are selectively coupled and which are made to cooperatively form the tool. Such a technique is often referred to as a “lamination technique” and, by way of example and without limitation, is described and claimed within U.S. Pat. No. 6,587,742 (hereinafter sometimes referred to as “the '742 patent”) which issued on Jul. 1, 2003, which is fully and completely incorporated herein by reference, word for word, and paragraph for paragraph, and which is owned by Applicant's Assignee.
While the laminated tooling technique or strategy does dramatically reduce the cost and time associated with the production of a tool, it sometimes produces an uneven surface finish which, in some situations, must be finished or “reworked” (e.g., the unevenness of the surface finish portion must be made to be relatively smooth and uniform).
Yet another approach involves casting the tool. While this approach does reduce the overall time and cost involved in the tool creation process, the produced (e.g., “casted”) tool is structurally weak and has poor heat transfer characteristics, thereby causing this approach to be generally undesirable.
There is therefore a need for a new and improved tool creation technique/strategy/method and a new and improved tool which overcomes some or all of the foregoing drawbacks associated with prior tool creation techniques/strategies/methods and tools. The present invention provides these and other benefits.
It is a first non-limiting object of the present invention to provide a tool and a method for producing a tool which overcomes some or all of the previously delineated drawbacks of prior tools and tool formation methodologies/strategies and techniques.
It is a second non-limiting object of the present invention to provide a tool and a method for producing a tool which overcomes some or all of the previously delineated drawbacks of prior tools and tool formation methodologies/strategies and techniques and which, by way of example and without limitation, provides a tool which is structurally strong and has relatively good heat transfer characteristics.
It is a third non-limiting object of the present invention to provide a tool and a method for producing a tool which overcomes some or all of the previously delineated drawbacks of prior tools and tool producing strategies and methodologies and techniques which, by way of example and without limitation, involves the use of dissimilar materials in the tool formation process and in the produced tool.
According to a first aspect of the present invention, a laminated tool is provided. Particularly, the laminated tool includes a plurality of sectional members which are respectively formed from a first material and which cooperatively form a forming surface; and a layer of a second material which is cast upon said forming surface.
According to a second aspect of the present invention, a method for producing a tool is provided. Particularly, the method includes the steps of initially determining a desired size of said tool; forming a plurality of sections from a first material; coupling the sections, effective to cause the coupled sections to form an object having a forming surface, the object being dissimilar from the desired size; and placing a thin layer of a second material upon the forming surface, thereby forming the tool.
According to a third aspect of the present invention, a method for forming a tool of a certain predetermined size and shape is provided. Particularly, the method includes the steps of forming an object from a first material, the object having a shape which is substantially similar to the predetermined shape but which is smaller than the predetermined size; and placing a quantity of a second material upon the formed object, thereby forming a second object having a size and a shape which is substantially identical to the predetermined size and shape.
According, to a fourth aspect of the present invention, a method for forming a tool is provided and includes the steps of determining a size and a shape to be given to the tool; forming an undersized tool having a certain forming surface, wherein the tool is formed from the cooperative combination of a plurality of sectional lamination members each of which is formed from a first material; using the formed surface to create a casting model; using the casting model to apply a second material to the certain formed surface, thereby forming said tool of the determined size and shape.
These and other features, aspects, and advantages of the present invention will become apparent from a reading of the following detailed description of the preferred embodiment of the invention, including the subjoined claims, and by reference to the following drawings.
Referring now to
Particularly, the tool 10 is made, in the most preferred embodiment of the invention, from several formed sectional members, such as sectional members 12 and 14, and by a lamination tool creation process which is more specifically delineated within The '742 patent. In this most preferred embodiment of the invention, the sectional members, such as sectional member 12, which is shown, for example, in
As will be discussed in greater detail below, in one non-limiting embodiment, the finished surface 18 is formed from a second and dissimilar material to that which is used to form the sectional members, such as sectional members 12, 14. In the most preferred embodiment of the invention, the surface finish 18 is formed from epoxy or another type of compound or material which is dissimilar to the material used to selectively form the sectional members, such as sectional members 12, 14.
Further, as shown best in
To better understand the overall methodology of the preferred embodiment of the invention, reference is now made to
Particularly, methodology 50 includes a first step 52 which denotes the overall beginning or “start” of the methodology 50 and which represents an intent or desire to build a tool, such as tool 10.
Step 52 is followed by step 54 in which the overall size and shape of the desired tool, such as tool 10, is determined. Such a determination includes the desired number and the respective size, shape and length of the conformal-cooling channels, such as passageways 40, 42.
Step 54 is followed by step 56 in which the pre-tool or unfinished tool or undersized object 16 is created, including an unfinished surface 20. Particularly, in the most preferred embodiment of the invention, the unfinished tool 16 is created, as earlier described, by the use of laminates or sectional members, such as sectional members 12, 14, and is undersized, in the most preferred embodiment of the invention, by an amount equal to the size of the finished surface 18. The creation of the object 16 may be accomplished, by example, according to the teachings of The '742 patent.
Step 58 follows step 56 and, in this step 58, a finish layer, such as surface finish layer 18, is placed upon the unfinished surface 20 of the pre-tool 16. In the most preferred embodiment of the invention, the surface finish layer 18 is comprised of epoxy and is castably placed upon the unfinished surface 20.
That is, as shown best in
It should be understood that the sectional members, such as sectional members 12, 14 may be manufactured from copper, aluminum, or substantially any other desired material. Further, it should be appreciated that adhering portions, such as hooks or ridges or protuberances (of various sizes and shapes) 100, may be formed upon the surface 20 and are respectively and cooperatively effective to enhance the adherence of the material 74 to the unfinished surface 20 by increasing the surface area upon which the material 74 is bound and by “disrupting” the “smoothness” of the surface 20. It should also be realized that, in the most preferred embodiment of the invention, the layer 18 is relatively thin (e.g., about two to about twenty centimeters), although other widths and thicknesses may be utilized. Further, it should be realized that portions 100 may be formed by “machining” or otherwise “working”/cutting surface 20, or by any other technique.
It should be further realized that the foregoing casting methodology allows substantially any sort or undesired undulations, protuberances, “steps”, or other surface or spatial features to be covered and “smoothed” by the second material 74. Hence, the foregoing strategy concomitantly provide the desired cost benefit, superior strength, and heat transfer characteristics associated with a laminate tool, while cost effectively minimizing and/or eliminating the undesired finished surface features associated with the lamination technique/strategy (e.g., the foregoing casting process is a very cost efficient process and smooths the surface 20).
Further, it should be appreciated that the second material 74 may comprise substantially any castable material (e.g., any material, such as copper, which is capable of being casted unto the undersized object or tool in the manner delineated above) and that the passageways, such as 40, 42, may be used to heat and/or cool the finished tool 10.
It is to be understood that the invention is not limited to the exact construction and methodology which has been illustrated and discussed above, but that various changes and modifications may be made without departing from the spirit and the scope of the inventions as they are more fully delineated in the foregoing claims.
