JP2003094301A - Grinding wheel edge structure for coring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the quality of a product by forming a tapered part in the outside surface of an edge and thinning the thickness of the lower part of the edge. SOLUTION: This grinding wheel edge structure for coring is provided with a cylindrical edge 4 suspended from the lower surface 2a of a base part 2 and cutting a glass disk from, at least, a glass pane 10 by the edge 4 rotating along with the front base part 2. This edge 4 is formed with the tapered part 4a having a shape gradually thinning its thickness toward the lower part, in its outside surface.

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a blade structure for a grinding wheel for coring, and more particularly, to a blade having a tapered portion formed on an outer surface of a cylindrical blade. The present invention relates to a novel improvement for reducing the thickness of a lower portion, improving processing accuracy such as cutting a glass plate, and improving product quality of a processed glass disk. 2. Description of the Related Art Conventionally, as a blade structure of a coring whetstone of this kind, a structure shown in FIG. 7 has been generally employed. That is, in FIG. 7, what is indicated by reference numeral 1 is a grinding wheel for coring, and a handle 3 is provided on an upper portion of a base 2 of the grinding wheel 1 for coring, and a lower surface 2a of the base 2 has a lower surface. And a blade 4 (shown in cross section in the figure) which is formed so as to hang down and has a cylindrical shape as a whole. Accordingly, in the above-described configuration, when the blade 4 is lowered into the glass plate while rotating on a glass plate (not shown) (not shown), the blade 4 forms a circular groove in the glass plate. This groove is further cut and penetrated by further lowering the blade, and a glass disk is formed inside the blade 4. [0004] The conventional blade structure of a grinding wheel for coring has the following problems because it has been configured as described above. That is, the blade of the conventional coring grindstone has the same thickness from the upper end to the lower end in the cross-sectional shape. Originally, the thinner this kind of blade, the better the product quality such as the cut glass disk, but it is technically extremely difficult to make this thickness uniform all the time. There was a great deal of cost to make such a thin finish. Therefore, it is impossible to achieve an improvement in product quality because conventional blades cannot be made thinner. The present invention has been made to solve the above problems, and in particular, by forming a tapered portion on the outer surface of a cylindrical blade, the thickness of the lower portion of the blade is reduced,
An object of the present invention is to provide a blade structure of a grinding wheel for coring that improves processing accuracy such as cutting of a glass plate and improves product quality of a processed glass disk. [0006] A blade structure of a coring grindstone according to the present invention has a cylindrical blade hanging from a lower surface of a base, and the blade rotates with the base. In a blade structure of a coring grindstone in which a glass disk is cut out from at least a glass plate, a tapered portion having a shape whose thickness is reduced downward is formed on an outer surface of the blade. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a blade structure of a coring grindstone according to the present invention will be described below with reference to the drawings. The same or equivalent parts as those in the conventional example will be described using the same reference numerals. In FIG. 1, reference numeral 1 denotes a coring grindstone, and a handle 3 is provided on an upper portion of a base 2 of the coring grindstone 1 and a lower surface 2a of the base 2 hangs downward. A blade 4 (shown in cross-section in the figure), which is formed in a cylindrical shape and has an overall shape, is provided. A tapered portion 4a is formed on the outer surface of the blade 4 so as to become thinner downward, and the lower end 4b of the blade 4 is about half or less of its upper end 4c. The thickness is configured. The smaller the thickness of the lower end portion 4b, the higher the product quality after cutting a glass plate or the like. Next, a case where a glass disk as a product is actually manufactured from a glass plate using the blade 4 of the above-described coring grindstone 1 will be described. First, in FIGS. 2 to 4, a reference numeral 10 denotes a rectangular glass plate, and an ultraviolet curing tape 11 having an area larger than the area of the glass plate 10 is attached to the back surface 10 b of the glass plate 10. The ultraviolet curing tape 11 protrudes around the glass plate 10. On the glass plate 10, four disk patterns 12 and two alignment marks 13 are formed by well-known photographic processing. The glass plate 10 is attached to the suction table 13A via the ultraviolet curing tape 11. Positioned and fixed above. Next, the operation will be described. First, FIG.
As shown in FIG. 2, the glass plate 10 placed on the suction table 13A is suction-fixed by suction air 14 of a suction source (not shown) such as a vacuum. In the aforementioned state, the alignment mark 13 is read by the CCD camera 15 of the coordinate reading device (not shown) to read the machine coordinates with respect to the disk pattern 12, and based on the machine coordinates, a known three-dimensional positioning device (not shown) is used for coring. The blade 4 of the whetstone 1 is lowered while rotating, and the cutting process of each disk pattern 12 is performed. The blade 4 of each disk pattern 12 described above
In the case of the cutting process, the dimension hardening process is performed so that the ultraviolet curing tape 11 is not cut, and the number of the alignment marks and the disk patterns 12 is not limited to the number described above, and may be any number. Whetstone for coring 1
May be one or more. Next, as shown in FIG.
After the blade 2 has been cut by the blade 4, the ultraviolet curing tape 11 is irradiated with ultraviolet rays, whereby the ultraviolet curing tape 11 is cured, and the disk patterns 12 are chucked by chucking means (not shown) such as a suction cup. Thus, a disk-shaped or donut-shaped glass disk for an encoder can be obtained by removing from the ultraviolet curing tape 11. That is, the shape of the blade 4 may be various donut shapes such as the double in FIG. 5 and the triple in FIG. The cutting operation using the coring grindstone 1 can be applied to materials other than the above-mentioned glass plate. [0014] The blade structure of the grinding wheel for coring according to the present invention is configured as described above, so that the following effects can be obtained. That is, since the tapered portion is formed on the outer peripheral surface of the lower portion of the blade of the coring grindstone, the thickness of the lower end portion, which is the front end portion, can be made extremely thin. Improvement can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of a blade structure of a coring grindstone according to the present invention. FIG. 2 is a plan view of a glass plate showing a mode of cutting using the blade structure according to the present invention. FIG. 3 is a side view of FIG. 2; FIG. 4 is a configuration diagram showing a cutting state of FIG. 3; FIG. 5 is a configuration diagram showing another embodiment of FIG. 1; FIG. 6 is a configuration diagram showing another embodiment of FIG. 1; FIG. 7 is a configuration diagram of a conventional configuration. [Description of Signs] 1 Glass plate 2 Base 2a Lower surface 4 Blade 4a Tapered portion

Claims (1)

Claims: 1. A blade (4) having a cylindrical blade (4) hanging from a lower surface (2a) of a base (2), and rotating together with the base (2). In the blade structure of a coring grindstone in which a glass disk is cut out from at least the glass plate (10), a tapered portion (4a) having a shape in which the thickness decreases downward on the outer surface of the blade (4). ). A blade structure for a grinding wheel for coring, wherein