CA2043486A1 - Self-adhering chaplet - Google Patents
Self-adhering chapletInfo
- Publication number
- CA2043486A1 CA2043486A1 CA 2043486 CA2043486A CA2043486A1 CA 2043486 A1 CA2043486 A1 CA 2043486A1 CA 2043486 CA2043486 CA 2043486 CA 2043486 A CA2043486 A CA 2043486A CA 2043486 A1 CA2043486 A1 CA 2043486A1
- Authority
- CA
- Canada
- Prior art keywords
- invention defined
- chaplet
- body portion
- adhesive layer
- mold
- 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.)
- Abandoned
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A chaplet having an adhesive layer formed thereon for positioning a core within a mold during a molten metal casting operation is disclosed. The chaplet includes a body portion which is preferably formed from a material which is vaporizable upon contact by molten metal, such as expanded polystyrene. The adhesive layer is preferably covered with a removable release liner, such as paper. The chaplet may be formed having a plurality of surfaces, each of which is covered by an adhesive layer and a release liner.
A chaplet having an adhesive layer formed thereon for positioning a core within a mold during a molten metal casting operation is disclosed. The chaplet includes a body portion which is preferably formed from a material which is vaporizable upon contact by molten metal, such as expanded polystyrene. The adhesive layer is preferably covered with a removable release liner, such as paper. The chaplet may be formed having a plurality of surfaces, each of which is covered by an adhesive layer and a release liner.
Description
2~3~186 TITLE
SELF-ADHERING CHAPLET
BACKGRO~ND OF THE INVENT:CON
This invention relates in general to positioners for use in metal casting operations and in particular to an improved chaplet having an adhesive layer formed thereon for positioning a core within a casting mold.
Casting is a well known process for forming articles from metal~ Basically, casting involves the pouring of molten metal into a mold having the shape of the article to be formed. When the molten metal cools, i~ solidifies in the desired shape for the article. Thus, to form a s$mple 15 solid block of metal, a box-shaped mold is filled with molten metal. More frequently, however, it is desired to form an article havin~ a hollow interior portion, such as a hollow cylindrical tuba. To accomplish this, a cora is inserted within the mold prior to casting the molten metal.
20 The cora is formed having a shape which corresponds to the desired shape of the hollow interior portion. As the molten metal is poured into the mold, the core prevents it from filling the space occupied thereby. When the metal has solidified, the core is removed to provide an article 25 having a hollow interior portion.
Often, it is necessary to precisely position the core within a mold cavity so as to be spaced apart from the inner surfaces of the mold. To accomplish this, it is known to place one or more relatively small spacers, 30 commonly referred to as chaplets, between the outer surfaces of the core and the inner surfaces of the mold.
The chaplets precisely position the core within the mold as the molten metal is poured therein. In the past, such chaplets were formed from metal. These metallic chaplets 35 were surrounded by the molten metal and became integral portions of the cast article. More recently, chaplets have 3~8~
;
been ~`ormed from a vaporizable material, such as expanded polystyrene. When the molten metal is poured into the mold, the heat generated therefrom vaporizes the chaplets on contact. Thus, having performed their positioning 5 function, the chaplets are destroyed so that the molten metal can completely fill the space between the outer surfaces of the core and the inner surfaces of the mold.
Unfortunately, it has been found that the chaplets are prone to movement within the mold prior to the casting of - 10 the molten metal. This is particularly true when a plurality o~ irregularly shaped core portions are disposed within the mold. Because of this, it is known in the art to apply a drop of liquid glue to a portion of a surface of a chaplet so that the chaplet will adhera to an outer 15 surface of the core or the inner surface of the mold. A
hot glue gun is known to have baen used for this purpose.
However, applying a drop of liquid glue to a portion of a surEace of a chaplet in this manner is slow and labor inten.sive. ~lso, it is difficult to control the amount of 20 glue applied in this manner. Frequently, too much or too little glue is applied, resulting in non-adhesion of the chaplet to the surface. Also, this method is not effective when several cores are stacked within the mold cavity, since glue is only applied to one surface of the chaplet.
25 Accordingly, it would be desirable to provide an improved chaplet having an adhesive surface formed thereon for positioning a core within a mold.
U.S. Patent No. 3,374,827 to Schebler discloses a method of preparing a complex sand mold for use in a metal 30 casting operation. Expanded polystyrene spacers are used to support individual portions of the sand core in desired positions relative to one another while glue joining such individual portions cures. Once the glue has cured, the core is disposed in a mold for casting. Because the 35 spacers vaporize upon casting the engine block, the manual 3 ;~ 3qL~
step of removing the spacers from the core before pouring the molten metal is eliminated.
SU~MARY OF THE INVENTION
This invention relates to an improved chaplet having an adhesivs layer fo~ned thereon for positioning a core within a mold during a molten metal casting operation. The chaplet includes a body portion which is preferably formed from a material which is vaporizable upon contact by molten 10 metal, such as expanded polystyrene. The adhesive layer is preferably covered with a removable release liner, such as paper. The chaplet may be formed having a plurality of surfaces, each of which is covered by an adhesive layer and a release liner.
It is an object of this invention to provide an improved chaplet having an adhesive layer ~ormed thereon for positioning a core within a mold during a molten m~tal casting operation.
~t is another object of this invention to provide such 20 an improved chaplet with a release liner which is removably secured to the adhesive layer.
It is a further object of this invention to provide such an improved chaplet which is easy to use and will reduce labor expense in casting operations.
Other objects and advantages of this invention will become apparent to those skilled in the art from the following detailed description of the preferred embodiment, when read in light of the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. l is a perspective view of a chaplet in accordance with this invention.
Fig. 2 is a partial sectional elevational view of the chaplet illustrated in Fig. l.
Fig. 3 is a partial sectional elevational view of a casting mold containing a plurality of stacked cores ,' ' ' .:
. ~, 7~ ~ L~3 d~ 'B '6, showing the use of a plurality oE the chaplets illustrated in Fig. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawin~s, there is illustrated in Figs. 1 and 2 a chaplet, indicated generally at 10, in accordance with this invention. The chaplet 10 includes a body portion 11 which is preferably formed from a material which is vaporizable upon contact by molten metal, such as 10 expanded polystyrene. However, the body portion 11 may alternatively be formed from metal or a similar non-vaporizable material. In the illustrated embodiment, the body portion 11 is shaped in the form of a cube, thus defining six flat surfaces. However, the body portion 11 15 may be formed in various other shapes as desired, depending upon the particular application. For example, the body portion 11 may be formed having curved surfaces to match the contour of a core or a mold with which the chaplet 10 is to be used, as described in further detail below.
As shown in Figs. 1 and 2, a layer of adhesive 12 is applied to two opposed surfaces of the body portion 11.
Any conventional adhesive material may be used. The adhesive layer 12 is substantially uniform in thickness and extends throughout the entire area of the surfaces of the 25 body portion 11. A release liner 13 covers each of the adhesive layers 12. The release liners 13 are provided to protectively cover the adhesive layers 12 prior to the chaplet 10 being used. Also, the release liners 13 prevent the chaplet 10 from adhering to other chaplets or to 30 containers therefor during shipment and handling prior to use. As shown in Fig. 1, the release liners 13 can be peeled off the adhesive layers 12 to expose the adhesive when ready for use.
The adhesive layer 12 and the release liner 13 may be 35 provided in the form of a pressure sensitive transfer film adhered to the surface of the body portion 11 of the ;~ ~L~3 chaplet 10. Two types of transfer films which have been found to function satisfactorily are ARclad 7418 (an acr~lic adhesive with a paper release liner) and ARclad 7098 ~a rubber ~ased adhesive with a paper release liner), 5 available from Adhesives Research, Inc. of Glen RocX, Pennsylvania. To manufacture the chaplet lO of this invention, the exposed adhesive layer of one of these types transfer films is pressed against the surface of the body portion 11 so as to adhere thereto. The release liner 13 10 is not removed so as to protectively cover the adhesive layer 12, as described above.
Fig. 3 illustrates the manner of use of this invention. As shown therein, upper and lower cores 30 and 31 are disposed within a mold 32 of a conventional casting 15 apparatus. A first plurality of chaplets lO are adhered to the base of the mold 32 and to the lower core 31. Thus, the lower core 31 is effectively retained in a desired position relative to the mold 32. A second plurality of chaplets lO are adhered to the lower core 31 and the upper 20 core 30. Thus, the upper lower core 30 is also effectively retained in a desired position relative to the mold 32.
When the molten metal is cast into the mold 32, the chaplets 10 will vaporize to permit the metal to flow completely about the cores 30 and 31. Thus, it can be seen 25 that the embodiment shown in Fig. 1, wherein adhesive layers 12 are adhered to two opposed surfaces of the body portion 11, is useful in stacking cores 30 and 31 within a mold 32.
In accordance with the provisions of the patent 30 statutes, the principle and mode of operation of this invention have been explained and illustrated in its preferred embodiment. However, it must be understood that this invention may be practiced otherwise than as specifically explained and illustrated without departing 35 from its spirit or scope.
-, . ~ .
~ ' :
'
SELF-ADHERING CHAPLET
BACKGRO~ND OF THE INVENT:CON
This invention relates in general to positioners for use in metal casting operations and in particular to an improved chaplet having an adhesive layer formed thereon for positioning a core within a casting mold.
Casting is a well known process for forming articles from metal~ Basically, casting involves the pouring of molten metal into a mold having the shape of the article to be formed. When the molten metal cools, i~ solidifies in the desired shape for the article. Thus, to form a s$mple 15 solid block of metal, a box-shaped mold is filled with molten metal. More frequently, however, it is desired to form an article havin~ a hollow interior portion, such as a hollow cylindrical tuba. To accomplish this, a cora is inserted within the mold prior to casting the molten metal.
20 The cora is formed having a shape which corresponds to the desired shape of the hollow interior portion. As the molten metal is poured into the mold, the core prevents it from filling the space occupied thereby. When the metal has solidified, the core is removed to provide an article 25 having a hollow interior portion.
Often, it is necessary to precisely position the core within a mold cavity so as to be spaced apart from the inner surfaces of the mold. To accomplish this, it is known to place one or more relatively small spacers, 30 commonly referred to as chaplets, between the outer surfaces of the core and the inner surfaces of the mold.
The chaplets precisely position the core within the mold as the molten metal is poured therein. In the past, such chaplets were formed from metal. These metallic chaplets 35 were surrounded by the molten metal and became integral portions of the cast article. More recently, chaplets have 3~8~
;
been ~`ormed from a vaporizable material, such as expanded polystyrene. When the molten metal is poured into the mold, the heat generated therefrom vaporizes the chaplets on contact. Thus, having performed their positioning 5 function, the chaplets are destroyed so that the molten metal can completely fill the space between the outer surfaces of the core and the inner surfaces of the mold.
Unfortunately, it has been found that the chaplets are prone to movement within the mold prior to the casting of - 10 the molten metal. This is particularly true when a plurality o~ irregularly shaped core portions are disposed within the mold. Because of this, it is known in the art to apply a drop of liquid glue to a portion of a surface of a chaplet so that the chaplet will adhera to an outer 15 surface of the core or the inner surface of the mold. A
hot glue gun is known to have baen used for this purpose.
However, applying a drop of liquid glue to a portion of a surEace of a chaplet in this manner is slow and labor inten.sive. ~lso, it is difficult to control the amount of 20 glue applied in this manner. Frequently, too much or too little glue is applied, resulting in non-adhesion of the chaplet to the surface. Also, this method is not effective when several cores are stacked within the mold cavity, since glue is only applied to one surface of the chaplet.
25 Accordingly, it would be desirable to provide an improved chaplet having an adhesive surface formed thereon for positioning a core within a mold.
U.S. Patent No. 3,374,827 to Schebler discloses a method of preparing a complex sand mold for use in a metal 30 casting operation. Expanded polystyrene spacers are used to support individual portions of the sand core in desired positions relative to one another while glue joining such individual portions cures. Once the glue has cured, the core is disposed in a mold for casting. Because the 35 spacers vaporize upon casting the engine block, the manual 3 ;~ 3qL~
step of removing the spacers from the core before pouring the molten metal is eliminated.
SU~MARY OF THE INVENTION
This invention relates to an improved chaplet having an adhesivs layer fo~ned thereon for positioning a core within a mold during a molten metal casting operation. The chaplet includes a body portion which is preferably formed from a material which is vaporizable upon contact by molten 10 metal, such as expanded polystyrene. The adhesive layer is preferably covered with a removable release liner, such as paper. The chaplet may be formed having a plurality of surfaces, each of which is covered by an adhesive layer and a release liner.
It is an object of this invention to provide an improved chaplet having an adhesive layer ~ormed thereon for positioning a core within a mold during a molten m~tal casting operation.
~t is another object of this invention to provide such 20 an improved chaplet with a release liner which is removably secured to the adhesive layer.
It is a further object of this invention to provide such an improved chaplet which is easy to use and will reduce labor expense in casting operations.
Other objects and advantages of this invention will become apparent to those skilled in the art from the following detailed description of the preferred embodiment, when read in light of the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. l is a perspective view of a chaplet in accordance with this invention.
Fig. 2 is a partial sectional elevational view of the chaplet illustrated in Fig. l.
Fig. 3 is a partial sectional elevational view of a casting mold containing a plurality of stacked cores ,' ' ' .:
. ~, 7~ ~ L~3 d~ 'B '6, showing the use of a plurality oE the chaplets illustrated in Fig. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawin~s, there is illustrated in Figs. 1 and 2 a chaplet, indicated generally at 10, in accordance with this invention. The chaplet 10 includes a body portion 11 which is preferably formed from a material which is vaporizable upon contact by molten metal, such as 10 expanded polystyrene. However, the body portion 11 may alternatively be formed from metal or a similar non-vaporizable material. In the illustrated embodiment, the body portion 11 is shaped in the form of a cube, thus defining six flat surfaces. However, the body portion 11 15 may be formed in various other shapes as desired, depending upon the particular application. For example, the body portion 11 may be formed having curved surfaces to match the contour of a core or a mold with which the chaplet 10 is to be used, as described in further detail below.
As shown in Figs. 1 and 2, a layer of adhesive 12 is applied to two opposed surfaces of the body portion 11.
Any conventional adhesive material may be used. The adhesive layer 12 is substantially uniform in thickness and extends throughout the entire area of the surfaces of the 25 body portion 11. A release liner 13 covers each of the adhesive layers 12. The release liners 13 are provided to protectively cover the adhesive layers 12 prior to the chaplet 10 being used. Also, the release liners 13 prevent the chaplet 10 from adhering to other chaplets or to 30 containers therefor during shipment and handling prior to use. As shown in Fig. 1, the release liners 13 can be peeled off the adhesive layers 12 to expose the adhesive when ready for use.
The adhesive layer 12 and the release liner 13 may be 35 provided in the form of a pressure sensitive transfer film adhered to the surface of the body portion 11 of the ;~ ~L~3 chaplet 10. Two types of transfer films which have been found to function satisfactorily are ARclad 7418 (an acr~lic adhesive with a paper release liner) and ARclad 7098 ~a rubber ~ased adhesive with a paper release liner), 5 available from Adhesives Research, Inc. of Glen RocX, Pennsylvania. To manufacture the chaplet lO of this invention, the exposed adhesive layer of one of these types transfer films is pressed against the surface of the body portion 11 so as to adhere thereto. The release liner 13 10 is not removed so as to protectively cover the adhesive layer 12, as described above.
Fig. 3 illustrates the manner of use of this invention. As shown therein, upper and lower cores 30 and 31 are disposed within a mold 32 of a conventional casting 15 apparatus. A first plurality of chaplets lO are adhered to the base of the mold 32 and to the lower core 31. Thus, the lower core 31 is effectively retained in a desired position relative to the mold 32. A second plurality of chaplets lO are adhered to the lower core 31 and the upper 20 core 30. Thus, the upper lower core 30 is also effectively retained in a desired position relative to the mold 32.
When the molten metal is cast into the mold 32, the chaplets 10 will vaporize to permit the metal to flow completely about the cores 30 and 31. Thus, it can be seen 25 that the embodiment shown in Fig. 1, wherein adhesive layers 12 are adhered to two opposed surfaces of the body portion 11, is useful in stacking cores 30 and 31 within a mold 32.
In accordance with the provisions of the patent 30 statutes, the principle and mode of operation of this invention have been explained and illustrated in its preferred embodiment. However, it must be understood that this invention may be practiced otherwise than as specifically explained and illustrated without departing 35 from its spirit or scope.
-, . ~ .
~ ' :
'
Claims (17)
1. A chaplet comprising:
a body portion defining a surface; and, an adhesive layer adhered to said surface, said adhesive layer having a substantially uniform thickness and extending completely over said surface.
a body portion defining a surface; and, an adhesive layer adhered to said surface, said adhesive layer having a substantially uniform thickness and extending completely over said surface.
2. The invention defined in Claim 1 wherein said body portion is formed from a material which is vaporizable upon contact by molten metal.
3. The invention defined in Claim 2 wherein said vaporizable material is expanded polystyrene.
4. The invention defined in Claim 1 wherein said body portion is formed from a metallic material.
5. The invention defined in Claim 1 wherein said surface is flat.
6. The invention defined in Claim 1 wherein said adhesive layer is covered with a removable release liner.
7. The invention defined in Claim 6 wherein said release liner is formed from paper.
8. The invention defined in Claim 1 wherein said body portion defines a plurality of surfaces and an adhesive layer is adhered to each of said surfaces, each of said adhesive layers having a substantially uniform thickness and extending completely over each of said surfaces.
9. The invention defined in Claim 8 wherein each of said adhesive layers is covered with a removable release liner.
10. The invention defined in Claim 7 wherein each of said release liners is formed from paper.
11. A chaplet comprising:
a body portion defining a surface;
an adhesive layer adhered to said surface; and a release liner removably adhered to said adhesive layer.
a body portion defining a surface;
an adhesive layer adhered to said surface; and a release liner removably adhered to said adhesive layer.
12. The invention defined in Claim 11 wherein said body portion is formed from a material which is vaporizable upon contact by molten metal.
13. The invention defined in Claim 12 wherein said vaporizable material is expanded polystyrene.
14. The invention defined in Claim 11 wherein said body portion is formed from a metallic material.
15. The invention defined in Claim 11 wherein said surface is flat.
16. The invention defined in Claim 11 wherein said body portion defines a plurality of surfaces, an adhesive layer is adhered to each of said surfaces, and a release liner is removably adhered to each of said adhesive layers.
17. The invention defined in Claim 16 wherein each of said release liners is formed from paper.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US61622190A | 1990-11-20 | 1990-11-20 | |
| US07/616,221 | 1990-11-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2043486A1 true CA2043486A1 (en) | 1992-05-21 |
Family
ID=24468515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2043486 Abandoned CA2043486A1 (en) | 1990-11-20 | 1991-05-29 | Self-adhering chaplet |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2043486A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109226689A (en) * | 2018-11-21 | 2019-01-18 | 安徽应流集团霍山铸造有限公司 | A kind of large size impeller Casting Equipment |
-
1991
- 1991-05-29 CA CA 2043486 patent/CA2043486A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109226689A (en) * | 2018-11-21 | 2019-01-18 | 安徽应流集团霍山铸造有限公司 | A kind of large size impeller Casting Equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |