Back up pad of grinding wheel
A back up pad of a grinding wheel includes two glass fiber layers and two carbon fiber layer attached to the glass fiber layer. The glass fiber layers and the carbon fiber layer are thermally compressed. The carbon fiber layer has a fabric construction of about 40-80 s/yarn×20-35 s/yarn (warp×fill).
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The present invention relates to a grinding wheel; and, more particularly, to a back up pad of the grinding wheel which is flexible to allow the grinding wheel to grind curved portions and which is relatively thin and light, thereby decreasing the production cost thereof.
BACKGROUND OF THE INVENTIONGenerally, a grinding wheel is mounted on a driving machine providing a rotational power thereto, and is used to grind a surface of a workpiece.
Referring to
Such a conventional back up pad 20 comprised of the glass fiber layer 22 is relatively thick and heavy, thereby increasing the production cost thereof. Further, the back up pad 20 is not sufficiently flexible to allow the grinding wheel to grind curved portions of a workpiece.
SUMMARY OF THE INVENTIONIt is, therefore, an object of the present invention to provide a back up pad of a grinding wheel which is flexible to allow the grinding wheel to grind curved portions and which is relatively thin and light, thereby decreasing the production cost thereof.
In accordance with a preferred embodiment of the present invention, there is provided a back up pad of a grinding wheel including: a plurality of glass fiber layers; and at least one carbon fiber layer attached to the glass fiber layer.
Preferably, two glass fiber layers and two carbon fiber layer are thermally compressed and the carbon fiber layer has a fabric construction of about 40-80 s/yarn×20-35 s/yarn (warp×fill).
BRIEF DESCRIPTION OF THE DRAWINGSThe above and other objects and features of the present invention will become apparent from the following description of a preferred embodiment given in conjunction with the accompanying drawings, in which;
Referring to
Referring now to
In this embodiment, although the glass fiber layers 122 are located above the carbon fiber layers 124 and the coated abrasives flaps 10 are attached to the glass fiber layers 122, the locations of the glass fiber layers 122 and the carbon fiber layers 124 may be exchanged and the coated abrasives flaps 10 are attached to the carbon fiber layers 124. Alternatively, the glass fiber layers 122 and the carbon fiber layers 124 may be alternately stacked. In this case, the non-woven sheet and the coated abrasives flaps are respectively attached to the uppermost glass or carbon fiber layer and the lowermost glass or carbon fiber layer.
A comparison test for the back up pad of the present invention and a conventional back up pad was conducted and the result thereof is shown in Table 1.
In the above test, the tensile strength was measured by using LLOYD instruments type LR5R tester and the toughness against rotational fracture was measured by rotating the back up pad at 30,000 rpm. Further, in Table 1, the flexibility is the greatest at 1 and the lowest at 10.
As indicated in Table 1, the back up pad of the present invention, which was made by thermally compressing two glass fiber layers and two carbon fiber layers, exhibits superior effects in all of tensile strength, toughness against rotational fracture and flexibility to the conventional back up pad, which was made by thermally compressing six glass fiber layers.
Moreover, since the total number of fiber layers is decreased, the back up pad of the present invention becomes light and easy to handle. In addition, the production cost of the pack up pad is reduced by using the carbon fiber.
Since the back up pad of the present invention has a greater flexibility, it is possible to allow the grinding wheel to grind curved portions which are difficult to be grinded by a grinding wheel employing the conventional back up pad.
While the invention has been shown and described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims
1. A back up pad of a grinding wheel comprising:
- a plurality of glass fiber layers; and
- at least one carbon fiber layer attached to the glass fiber layer.
2. The back up pad of claim 1, wherein the glass fiber layers and the carbon fiber layer are thermally compressed.
3. The back up pad of claim 1, wherein the number of the glass fiber layers is two and two carbon fiber layers are attached to the glass fiber layers.
4. The back up pad of claim 1, wherein the carbon fiber layer has a fabric construction of about 40-80 s/yarn×20-35 s/yarn (warp×fill).
5. The back up pad of claim 1, wherein a plurality of coated abrasive flaps are circumferentially arranged on the back up pad.
6. The back up pad of claim 3, wherein the carbon fiber layers have a fabric construction of about 40-80 s/yarn×20-35 s/yarn (warp×fill).
7. The back up pad of claim 3, wherein a plurality of coated abrasive flaps are circumferentially arranged on the back up pad.
8. The back up pad of claim 3, wherein the back up pad has tensile strength of between 250 and 300 Kgf/in2.
9. The back up pad of claim 1, wherein the glass fiber layers and the carbon fiber layer are thermally compressed; and
- wherein the number of the glass fiber layers is two and two carbon fiber layers are attached to the glass fiber layers.
10. The back up pad of claim 9, wherein the carbon fiber layers have a fabric construction of about 40-80 s/yarn×20-35 s/yarn (warp×fill).
11. The back up pad of claim 9 wherein a plurality of coated abrasive flaps are circumferentially arranged on the back up pad.
12. The back up pad of claim 9 wherein the back up pad has tensile strength of between 250 and 300 Kgf/in2.
Type: Application
Filed: Apr 23, 2004
Publication Date: Aug 4, 2005
Applicant: SUN ABRASIVES CO., LTD. (Gyeonggi-do)
Inventor: Tong Shin (Gyeonggi-do)
Application Number: 10/829,935