METHOD FOR SECURING AN INSERT IN THE MANUFACTURE OF A DAMPED PART
One embodiment of the invention includes a method including providing an insert, wherein at least a portion of the insert is attracted to a magnet; providing a mold including a first mold portion, a second mold portion, and a magnet having at least a portion thereof in or adjacent to at least one of the first mold portion or the second mold portion; positioning the insert in one of the mold portions such that the at least one magnet at least assists in holding the insert in place; and closing the mold and casting a molten material into the mold and around or adjacent to at least a portion of the insert and solidifying the material.
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This application claims the benefit of U.S. Provisional Application No. 60/953,793, filed Aug. 3, 2007.
TECHNICAL FIELDThe field to which the disclosure generally relates includes a method of manufacturing a damped part including an insert.
BACKGROUNDParts subjected to vibration may produce unwanted or undesirable vibrations. Similarly, a part or component may be set into motion at an undesirable frequency for a prolonged period. For example, parts such as brake rotors, brackets, pulleys, brake drums, transmission housings, gears, and other parts may contribute to noise that gets transmitted to the passenger compartment of a vehicle. In an effort to reduce the generation of this noise and thereby its transmission into the passenger compartment, a variety of techniques have been employed, including the use of polymer coatings on engine parts, sound absorbing barriers, and laminated panels having visco elastic layers. The undesirable vibrations in parts or components may occur in a variety of other products including, but not limited to, sporting equipment, household appliances, manufacturing equipment such as lathes, milling/grinding/drilling machines, earth moving equipment, other non-automotive applications, and components that are subject to dynamic loads and vibration. These components can be manufactured through a variety of means including casting, machining, forging, welding, die-casting, etc.
SUMMARY OF EXEMPLARY EMBODIMENTS OF THE INVENTIONOne embodiment of the invention includes a method including providing an insert, wherein at least a portion of the insert is attracted to a magnet; providing a mold including a first mold portion, a second mold portion, and a magnet having at least a portion thereof in or adjacent to at least one of the first mold portion or the second mold portion; positioning the insert in one of the mold portions such that the at least one magnet at least assists in holding the insert in place; and closing the mold and casting a molten material into the mold and around or adjacent to at least a portion of the insert and solidifying the material.
Other exemplary embodiments of the invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while disclosing exemplary embodiments of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Exemplary embodiments of the present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
The following description of the embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
In one embodiment of the invention, a method of manufacturing a product is provided. Referring to
The first rotor cheek 16 may include a first cheek face 20 and a second cheek face 22. In one embodiment, the hub portion 14 may include a central aperture 24. The hub portion 14 may also include a plurality of bolt holes 26. The hub portion 14 and the first rotor cheek 16 may comprise one of cast iron, gray cast iron, titanium, aluminum, steel, stainless steel, any of a variety of other alloys, or metal matrix composite. At least a portion of the insert 18 may comprise a material attracted to a magnet. In various embodiments, at least a portion of the insert 18 may comprise at least one of a ferrous based material including, but not limited to, cast iron, gray cast iron, steel, or stainless steel, or a nonferrous based material including, but not limited to, aluminum, magnesium, or titanium, or any of a variety of other alloys, or metal matrix composite. In one embodiment, the insert 18 may be about 0.1 mm to about 20 mm thick. The insert 18 may include a coating. In one embodiment, the coating may prevent cast metal from bonding to the insert during the manufacturing process, in order to ensure that the insert dampens the vibration of the product using frictional or Coulomb damping.
In another embodiment shown in
Referring to
The first mold portion 32 and the second mold portion 34 are configured to manufacture the part 500. The two portions of the mold 32 and 34 form a cavity 36 for casting the part 500. In one embodiment, the first mold portion 32 and the second mold portion 34 may be sand molds. The first mold portion 32 may also include a generally cylindrical protrusion 38 configured to produce the central aperture 24 on the part 500 (shown in
Still referring to
In one embodiment, the magnet 44 may be an electromagnet. The magnet 44 may be instrumented and activated after loading the insert 18 and while closing the second mold portion 34. The magnet 44 may be any suitable shape, for example, the shape of a circle, oval, triangle, square, rectangle, or Y-shape. In one embodiment, the magnet 44 may be the same general shape as the insert 18. The magnet 44 may be positioned inside the first mold portion 32 with an end magnet portion 45 extending beyond the first mold portion 32. The magnet 44 may be removed from the first mold portion 32 using the end magnet portion 45, for example by pulling the magnet 44 out of the first mold portion by pulling the end magnet portion 45. The magnet 44 may be positioned inside the second mold portion 34 at a distance 46 from the edge of the second mold portion 34 that will allow the magnet 44 to at least assist in securing the insert 18. In other embodiments, the magnet 44 may be positioned at any suitable location that will allow the magnet 44 to at least assist in securing the insert 18 in the mold 30.
In an embodiment where the magnet 44 is an electromagnet, the electromagnet may be activated after the insert is loaded onto the second mold portion 34. The electromagnet may then at least assist in holding the insert in place until the first mold portion 32 engages the second mold portion 34, as shown in
A compressive force may be applied to the first mold portion 32 and the second mold portion 34, for example to push the mold portions 32 and 34 together. The tabs 40 of the insert 18 may be supported between the cutout portions 42 of the second mold portion 34 and lands 48 of the first mold portion 32. According to one embodiment, the material 60 is then introduced, for example injected, into the cavity 36 to form the part 500. In one embodiment, the material 60 may be cast (charging) into the mold and around or immediately adjacent to at least a portion of the insert or a coating thereon. For exemplary embodiments, the material 60 may be one of cast iron, gray cast iron, aluminum, steel, titanium, stainless steel, any of a variety of other alloys, or metal matrix composite. The material 60 may be molten. In another embodiment, the material 60 is a semi-solid material and may be introduced into the cavity 36 in accordance with the well known semi-solid forging process. In other embodiments, the material 60 may be introduced into the mold 30 by any suitable method. In other embodiments, the mold portions 32 and 34 may be attached to a molding device with ingates for the material 60, and the material 60 may enter the mold through the ingates (not shown).
In the embodiments shown in
Referring to
Referring now to
Referring to
According to various illustrative embodiments of the invention, frictional damping may be achieved by the movement of the frictional surfaces 502 against each other. The movement of frictional surfaces 502 against each other may include the movement of: surfaces of the body 506 of the part against each other; a surface of the body 506 of the part against a surface of the insert 18; a surface of the body 506 of the part against the layer 520; a surface of the insert 18 against the layer 520; a surface of the body 506 of the part against the particles 514 or fibers; a surface of the insert 18 against the particles 514 or fibers; or by frictional movement of the particles 514 or fibers against each other or against remaining binder material.
In embodiments wherein the frictional surface 502 is provided as a surface of the body 506 or the insert 18 or a layer 520 over one of the same, the frictional surface 502 may have a minimal area over which frictional contact may occur that may extend in a first direction a minimum distance of 0.1 mm and/or may extend in a second (generally traverse) direction a minimum distance of 0.1 mm. In one embodiment the insert 18 may be an annular body and the area of frictional contact on a frictional surface 502 may extend in an annular direction a distance ranging from about 20 mm to about 1000 mm and in a transverse direction ranging from about 10 mm to about 75 mm. The frictional surface 502 may be provided in a variety of embodiments, for example, as illustrated in
Referring again to
Each frictional surface 502 may have a plurality of peaks 510 and a plurality of valleys 512. The depth as indicated by line V of the valleys 512 may vary with embodiments. In various embodiments, the average of the depth V of the valleys 512 may range from about 1 μm-300 μm, 50 μm-260 μm, 100 μm-160 μm or variations of these ranges. However, for all cases there is local contact between the opposing frictional surfaces 502 during component operation for frictional damping to occur.
In another embodiment of the invention the damping means or frictional surface 502 may be provided by particles 514 or fibers provided on at least one face of the insert 18 or a surface of the body 506 of the part 500. The particles 514 may have an irregular shape (e.g., not smooth) to enhance frictional damping, as illustrated in
In embodiments wherein at least a potion of the part 500 is manufactured such that the insert 18 and/or the particles 514 or fibers are exposed to the temperature of a molten material such as in casting, the insert 18 and/or particles 514 or fibers may be made from materials capable of resisting flow or resisting significant erosion during the manufacturing. For example, the insert 18 and/or the particles 514 or fibers may include refractory materials capable of resisting flow or that do not significantly erode at temperatures above 1100° F., above 2400° F., or above 2700° F. When molten material, such as metal, is cast around the insert 18 and/or the particles 514, the insert 18 or the particles 514 should not be wet by the molten material so that the molten material does not bond to the insert 18 or layer 520 at locations wherein a frictional surface 502 for providing frictional damping is desired.
Illustrative examples of suitable particles 514 or fibers include, but are not limited to, particles or fibers including silica, alumina, graphite with clay, silicon carbide, silicon nitride, cordierite (magnesium-iron-aluminum silicate), mullite (aluminum silicate), zirconia (zirconium oxide), phyllosilicates, or other high-temperature-resistant particles. In one embodiment of the invention the particles 514 may have a length along the longest dimension thereof ranging from about 1 μm-350 μm, or 10 μm-250 μm.
In another embodiment of the invention, the layer 520 may be a coating over the body 506 of the part or the insert 18. The coating may include a plurality of particles 514 which may be bonded to each other and/or to the surface of the body 506 of the part or the insert 18 by an inorganic or organic binder 516 (
In another embodiment, the coating may include at least one of alumina or silica particles, mixed with a lignosulfonate binder, cristobalite (SiO2), quartz, or calcium lignosulfonate. The calcium lignosulfonate may serve as a binder. In one embodiment, the coating may include IronKote. In one embodiment, a liquid coating may be deposited on a portion of the insert and may include any high temperature ceramic coating, such as but not limited to, Ladle Kote 310B. In another embodiment, the coating may include at least one of clay, Al2O3, SiO2, a graphite and clay mixture, silicon carbide, silicon nitride, cordierite (magnesium-iron-aluminum silicate), mullite (aluminum silicate), zirconia (zirconium oxide), or phyllosilicates. In one embodiment, the coating may comprise a fiber such as ceramic or mineral fibers.
When the layer 520 including particles 514 or fibers is provided over the insert 18 or the body 506 of the part the thickness L (
In yet another embodiment of the invention the particles 514 or fibers may be temporarily held together and/or to the surface of the insert 18 by a fully or partially sacrificial coating. The sacrificial coating may be consumed by molten metal or burnt off when metal is cast around or over the insert 18. The particles 514 or fibers are left behind trapped between the body 506 of the cast part and the insert 18 to provide a layer 520 consisting of the particles 514 or fibers or consisting essentially of the particles 514 or fibers.
The layer 520 may be provided over the entire insert 18 or only over a portion thereof. In one embodiment of the invention the insert 18 may include a tab 534 (
In one embodiment of the invention at least a portion of the insert 18 is treated or the properties of the insert 18 are such that molten metal will not wet or bond to that portion of the insert 18 upon solidification of the molten metal. According to one embodiment of the invention at least one of the body 506 of the part or the insert 18 includes a metal, for example, but not limited to, a ferrous based material including, but not limited to, cast iron, gray cast iron, steel, or stainless steel, or a non-ferrous based material including, but not limited to, aluminum, magnesium, or titanium, or any of a variety of other alloys, or metal matrix composite including abrasive particles. In one embodiment of the invention the insert 18 may include a material such as a metal having a higher melting point than the melting point of the molten material being cast around a portion thereof.
In one embodiment the insert 18 may have a minimum average thickness of 0.2 mm and/or a minimum width of 0.1 mm and/or a minimum length of 0.1 mm. In another embodiment the insert 18 may have a minimum average thickness of 0.2 mm and/or a minimum width of 2 mm and/or a minimum length of 5 mm. In other embodiments the insert 18 may have a thickness ranging from about 0.1-20 mm, 0.1-6.0 mm, or 1.0-2.5 mm, or ranges therebetween.
Referring now to
In other embodiments of the invention improvements in the frictional damping may be achieved by adjusting the thickness (L, as shown in
In one embodiment the insert 18 is not pre-loaded or under pre-tension or held in place by tension. In one embodiment the insert 18 is not a spring. Another embodiment of the invention includes a process of casting a material comprising a metal around an insert 18 with the proviso that the frictional surface 502 portion of the insert used to provide frictional damping is not captured and enclosed by a sand core that is placed in the casting mold. In various embodiments the insert 18 or the layer 520 includes at least one frictional surface 502 or two opposite friction surfaces 502 that are completely enclosed by the body 506 of the part. In another embodiment the layer 520 including the particles 514 or fibers that may be completely enclosed by the body 506 of the part or completely enclosed by the body 506 and the insert 18, and wherein at least one of the body 506 or the insert 18 comprises a metal or consists essentially of a metal. In one embodiment of the invention the layer 520 and/or insert 18 does not include or is not carbon paper or cloth.
Referring again to
Referring to
In another embodiment the insert 18 includes a tab 534 which may be formed by machining a portion of the first face 522 of the insert 18 (
Referring now to
Referring to
Referring now to
Referring now to
When the term “over,” “overlying,” overlies,” “under,” “underlying,” or “underlies” is used herein to describe the relative position of a first layer or component with respect to a second layer or component such shall mean the first layer or component is directly on and in direct contact with the second layer or component or that additional layers or components may be interposed between the first layer or component and the second layer or component.
The above description of embodiments of the invention is merely exemplary in nature and, thus, variations thereof are not to be regarded as a departure from the spirit and scope of the invention.
Claims
1. A method for manufacturing a part comprising:
- providing an insert, wherein at least a portion of the insert is attracted to a magnet;
- providing a mold comprising a first mold portion, a second mold portion, and a magnet having at least a portion thereof in or adjacent to at least one of the first mold portion or the second mold portion;
- positioning the insert in one of the mold portions such that the at least one magnet at least assists in holding the insert in place; and
- closing the mold and casting a molten material into the mold and around or adjacent to at least a portion of the insert and solidifying the material.
2. A method as set forth in claim 1 further comprising a coating overlying at least a portion of the insert.
3. A method as set forth in claim 1 wherein the insert comprises at least one of cast iron, gray cast iron, steel, stainless steel, aluminum, magnesium, titanium, alloys thereof, or metal matrix composite.
4. A method as set forth in claim 1 wherein the material comprises at least one of cast iron, gray cast iron, aluminum, titanium, steel, stainless steel, alloys thereof, or metal matrix composite.
5. A method as set forth in claim 1 wherein the magnet is an electromagnet.
6. A method for manufacturing a part as set forth in claim 5 further comprising activating the electromagnet after the insert is positioned in one of the mold portions.
7. A method as set forth in claim 1 further comprising removing the magnet from the mold before casting the material into the mold.
8. A method as set forth in claim 1 wherein the magnet is instrumented.
9. A method as set forth in claim 1 wherein the magnet is in the shape of one of a circle, oval, triangle, square, rectangle, or Y-shape.
10. A method as set forth in claim 1 wherein the magnet is partially enclosed by one of the first mold portion or the second mold portion and the magnet comprises an end portion extending beyond one of the first mold portion or the second mold portion.
11. A method as set forth in claim 1 wherein the magnet is completely enclosed in one of the first mold portion or the second mold portion.
12. A method as set forth in claim 1 wherein the mold is oriented vertically.
13. A method as set forth in claim 1 wherein the mold is oriented horizontally.
14. A method as set forth in claim 1 wherein the insert comprises at least one tab.
15. A method as set forth in claim 1 further comprising machining off the tab after solidifying the material.
16. A method as set forth in claim 1 wherein the mold is a sand mold.
17. A method as set forth in claim 1 further comprising providing a layer comprising particles or fibers over at least a portion of the insert.
18. A method as set forth in claim 1 further comprising treating at least a portion of the insert so that the molten material does not wet the portion of the insert and bond thereto upon solidification.
19. A product comprising:
- a mold; and
- at least one magnet positioned to at least assist in holding a magnetically attachable insert in the mold.
20. A product as set forth in claim 19 wherein the mold comprises a first mold portion and a second mold portion, and wherein the magnet is received in at least one of the first mold portion or the second mold portion.
21. A product as set forth in claim 19 wherein the magnet is an electromagnet.
22. A product as set forth in claim 19 wherein the magnet is instrumented.
23. A product as set forth in claim 19 wherein the magnet is in the shape of one of a circle, oval, triangle, square, rectangle, or Y-shape.
24. A product as set forth in claim 20 wherein the magnet is partially enclosed by one of the first mold portion or the second mold portion and the magnet comprises an end portion extending beyond one of the first mold portion or the second mold portion.
25. A product as set forth in claim 19 wherein the insert comprises a coating over at least a portion of the insert.
26. A product as set forth in claim 19 further comprising a layer comprising particles or fibers over at least a portion of the insert.
27. A product as set forth in claim 19 wherein the insert comprises at least one of cast iron, gray cast iron, steel, stainless steel, aluminum, magnesium, titanium, alloys thereof, or metal matrix composite.
28. A product as set forth in claim 19 wherein the insert comprises at least one tab.
Type: Application
Filed: Jul 1, 2008
Publication Date: Feb 5, 2009
Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC. (Detroit, MI)
Inventors: Michael D. Hanna (West Bloomfield, MI), Mohan Sundar (Troy, MI)
Application Number: 12/165,729
International Classification: B22D 19/00 (20060101); B22D 23/00 (20060101); B22D 45/00 (20060101);