JPH11116261A - Machining method of glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the methods each of which enables processing of glass at a low cost, machining of glass into a glass article having excellent roundness, remarkable shortening of machining time and also, lesser contamination with foreign matter such that cullet formed by punching a hole can directly be used as a raw material. SOLUTION: The methods of the present invention include: a first method that comprises scribing at least one surface of sheet glass 1 so as to form a circular scribe line 3 in the surface, placing the sheet glass 1 so that the scribed surface faces upward and in that state, punching a through-hole by applying impact on the scribed upper surface of the sheet glass 1 at plural points positioned along the inner periphery of the circular scribe line 3 and a point in the vicinity of the center of the circular scribe line 3 through strikes at an impactor 2 from above; a second method that comprises scribing at least one surface of sheet glass 1 so as to form a circular scribe line 3 in the central part of the surface, placing the sheet glass 1 so that the scribed surface faces upward and in that state, blowing cooling wind on the upper surface in the vicinity of the center of the circular scribe line 3 to subsequently punch an inner diameter hole by applying impact on the scribed surface inside the circular scribe line 3 through a strike(s) at an impactor 2 from above; and a third method that comprises scribing at least one surface of sheet glass 1 so as to form a circular scribe line 3 in the surface, heating a part inside the scribe line 3 in the scribed surface with a heating element, then quenching the heated part and thereafter applying an impact on the scribed surface in the part through a strike(s) at an impactor 2 from above to punch a through-hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing method and an apparatus for forming a circular hole in a sheet glass, and more particularly to an apparatus for manufacturing a glass substrate for a magnetic disk. It is for forming a hole.

[0002]

2. Description of the Related Art Conventionally, a so-called coring machine in which a diamond drill is rotated at a high speed is generally used to form an inner diameter hole. At present, it takes a long time and the processing method does not fully utilize the properties of glass.
In addition to this, there is also a type in which a mark is inserted diagonally in a sheet glass and a hole is made due to a temperature difference. However, since the mark is tapered, it takes a long processing time in the subsequent chamfering (inner diameter finishing) process. And problems such as a large reduction in drilling have occurred.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and can be processed at a low cost, has excellent roundness, and has a shorter processing time. Is the way. Furthermore, no obstacle is caused in the subsequent chamfering step, and no chipping failure occurs.

[0004]

According to the glass processing method of the present invention made to solve the above-mentioned problems, a circular marking is placed on at least one surface of a sheet glass, and at least one surface containing the marking is removed. In a state of being on the upper side, through holes are opened by striking the impact body from above through a plurality of impact points and the center near the center of the marking from the upper surface through the impact body. Also, as a second invention, a circular marking is put on at least one surface of the sheet glass, and in a state where at least one surface containing the marking is on the upper side, cooling air is applied to the vicinity of the center from above or below or from both sides, and The through hole is formed by hitting the impact body from above at a plurality of locations along the inside of the marking and near the center of the marking via an impact body from above. Further, as a third invention, a circular marking is put on at least one surface of the plate glass, and at least the inside of the marking on the surface containing the marking is heated by a heating body, and the inside of the marking is quenched from the upper surface to rapidly crack. It is characterized in that a through hole is opened by hitting the impact body from above at a plurality of locations along the inside of the marking and near the center via the impact body. In addition to the above configuration, prior to hitting the impacting body, a concave recessed cradle is installed under the lower surface of the plate glass, and further, at least a surface containing a marking. 80 to 4
Heated to 00 ° C, then penetrated by supplying a cooling medium to the inside of the marking and hitting the impacting body from above through the impacting body from above at several places along the inside of the marking and near the center from the upper side It is characterized by making a hole. Here, air, water, liquid nitrogen, dry ice, or the like is used as the cooling medium. Further, the invention is characterized in that circular markings of the same shape are put on both sides of the plate glass. After opening the through hole by hitting the impact body, the ceramic ball is applied from the opposite side of the sheet glass to the side where the impact was applied to remove the uncut portion, finish the inner diameter hole, and plier the glass. It is more preferable to remove the uncut portion by sandwiching the inner shape and finish the inner diameter hole. The tip of the impacting body is provided with R, and preferably, the impacting body is at -196 ° C to 30 ° C.
In addition to being a punch cooled to ° C., it is desired that the punch has a structure in which water can be supplied from the inside. The impact body may be a punch having a carbide tip at the tip. It is further advantageous if at least one surface with the marking has a marking slightly concentric with a circular marking and having a slightly smaller diameter.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on embodiments shown in the drawings. FIG. 1 is a sectional view showing a first embodiment of the present invention. First, the upper and lower surfaces of the sheet glass 1 are marked with a circular marking machine so as to have a circular shape corresponding to the inner diameter portion 4 to form the marking portion 3. Here, the marking is performed on the upper and lower surfaces so that the cracks run on both the upper and lower surfaces. Next, the punch is penetrated along the inside of the marking mark with a punch having a carbide tip as the impact body 2 from one side to the tip (not only in the present embodiment,
In any case, 4 to 6 places are preferable. ), Through the center hole. Either the center or the circumference may be performed first. At this time, the receiving base 5a having the concave portion 6 on the lower side is installed. The cradle 5a has an appropriate size.
If it is too big, it will crack. Preferably, a pedestal of 10 mmφ is good. Next, a blow is applied from the back surface using the ceramic ball 7 (also at this time, the recessed recess 5b
Is installed. At this time, the size of the receiving table 5b is preferably about the inner diameter. ) You can make beautiful holes by breaking glass.

The second embodiment will be described. First, a mark is made in a circular shape from one side of a sheet glass. Then, a cooling air (liquid nitrogen or cold air) is applied to the center to contract the inside of the marking, thereby penetrating the marking crack. Here, the liquid nitrogen used is -1
96 ° C. and -20 ° C. for cold air are preferred.
After that, by performing the treatment with the impact body in the same manner as in the first embodiment, a beautiful hole can be similarly formed.

[0007] In another embodiment, the same effect can be obtained by forming all holes only with a punch without using the ceramic spheres of the first embodiment. The same applies to the method of stripping with pliers without using the ceramic sphere of Example 1.

[0008] In a third embodiment, first, a scribing machine is used to put a scribing mark on one side of a plate glass. In addition, a circular marking machine with a diameter slightly smaller than this diameter is inserted. Next, a punch having a carbide tip at one end from one side is made to penetrate along the inside of the marking mark, and a hole is made also to the center. At this time, similarly to the first embodiment, a receiving dent recessed downward is installed. Next, a beautiful hole can be formed by applying a blow from the back surface using a ceramic ball and breaking the glass.

As a fourth embodiment, after marking is made on the upper and lower surfaces, the inner diameter-removed portion is heated by a heater such as a heater or a burner (for example, a heater at about 400 ° C. is used). Next, cracks are formed with a punch cooled to around 0 ° C., and through holes are formed in the same manner as described above.
At this time, crushing can be facilitated by dropping water.

[0010]

As described above, the glass processing method of the present invention can be produced at low cost, has excellent roundness, and can be processed in a shorter time than the conventional method. Furthermore, no obstacle is given in the subsequent chamfering step, and no chipping failure occurs. Further, as an incidental effect, cullet generated by perforation can be used as a raw material because contamination is small. Therefore, the present invention is of great significance as a glass processing method that has eliminated the conventional problems.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a first embodiment of the present invention.

FIG. 2 is a sectional view showing a first embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Sheet glass 5a, 5b Cradle 2 Impact body 6 Concave part 3 Mark part 7 Ceramic ball 4 Inner diameter equivalent part

Claims (12)

[Claims] 1. A circular marking is placed on at least one surface of a sheet glass, and a plurality of locations along the inside of the marking from the upper surface and the vicinity of the center are set in a state where at least one surface containing the marking is on the upper side. A method for processing glass, wherein a through hole is opened by hitting the impact body from above through the impact body. 2. A circular scribing is put on at least one surface of the sheet glass, and the cooling air is applied to the vicinity of the center from above or below or from both sides in a state where at least one surface containing the scribing is on the upper side. A method of processing glass, wherein a through hole is opened by hitting the impact body from above at a plurality of locations along the inside of the marking from the surface and near the center via the impact body. 3. A circular marking is placed on at least one surface of the sheet glass, and at least a portion of the marking-containing surface inside the marking is heated by a heating body, and the inside of the marking is rapidly cooled from the upper surface to generate cracks. A method of processing a glass, characterized in that a through hole is opened by hitting a plurality of points along the inside of a marking and the vicinity of the center thereof from above through an impact body. 4. The glass processing according to claim 1, wherein a concave recessed pedestal is provided below the lower surface of the sheet glass before hitting the impact body. Method. 5. At least the surface containing the marking is 80 to 4
Heated to 00 ° C, then penetrated by supplying a cooling medium to the inside of the marking and hitting the impacting body from above through the impacting body from above at several places along the inside of the marking and near the center from the upper side A hole is formed.
Item 5. The method for processing glass according to Item 4. 6. The glass processing method according to claim 1, wherein circular markings of the same shape are put on both sides of the sheet glass. 7. After the through hole is opened by hitting an impact body, a ceramic ball is applied from the surface of the sheet glass opposite to the surface to which the impact is applied, thereby removing the uncut portion and finishing the inner diameter hole. The method for processing glass according to claim 1, wherein: 8. The method for processing glass according to claim 1, wherein the glass is sandwiched between pliers to remove uncut portions and finish the inner diameter hole. 9. The glass processing method according to claim 1, wherein the impact body is a punch cooled to −196 ° C. to 30 ° C. 10. The punch according to claim 1, wherein the impact body is a punch having a structure capable of supplying water from the inside.
Item 10. The method for processing glass according to Item 9. 11. The method for processing glass according to claim 1, wherein the impact body is a punch having a carbide tip at a tip. 12. The glass processing according to claim 1, further comprising a marking having a slightly smaller diameter in a circle concentric with the marking on at least one surface containing the marking. Method.