JPH01133952A - Method for cutting planar brittle material - Google Patents

Abstract

PURPOSE:To cut a planar brittle material contg. ceramics with high accuracy and productivity by forming the line traces of the shapes to be cut on one face of the planar brittle material by means of tools, then by holding and pressing material in place between a pair of press plates having a male spherical face and female spherical face. CONSTITUTION:The line traces N of the shapes to be cut are previously cut on one face of the planar brittle material contg. ceramics (e.g.; alumina ceramics plate) by means of the tools including diamond cutters. The planar brittle material T is then held in place between the spherical face seats which have nearly the same curvature and are formed of the working plate A1 having the female spherical face Q1 and the working plate A2 having the male spherical face Q2 in such a manner that the line traces N are capable of coming into contact with the female spherical face Q1. Pressing load is then exerted between the spherical faces to deform the planar brittle material T along the respective spherical faces Q1, Q2 and to induce bending moment within the planar brittle material T, by which the planar brittle material is cut along the vertical sections conforming to the traces N. The planar brittle material T is thereby cut.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is mainly used for cutting processing of glass plates and various ceramic plates, such as in the production of integrated circuits and solar cell substrates. This invention relates to a method for cutting plate-like brittle materials used in industrial fields that require mass production.

(Prior art) Generally, when cutting a glass plate or a ceramic plate, a tool such as a diamond cutter is used to cut a strip in the shape of the shape to be cut on one side of the plate in advance, and the left and right parts of the strip are gripped. (Problem to be Solved by the Invention) Cutting by the conventional bending process is performed manually by applying a bending moment to the scratches as described above. As a result, productivity is poor, and it has become a bottleneck in various industries that involve cutting ceramics and the like.

In view of these points, it is an object of the present invention to provide a T-cutting method that dramatically improves productivity in cutting plate-like brittle materials including ceramics by relatively simple means. [Structure of the Invention] (Another Means for Solving Problems) The present invention provides a method for cutting a shape to be cut in advance with a tool such as a diamond cutter on the surface of a plate-like brittle material (hereinafter referred to as a workpiece) containing ceramics. Then, a spherical seat with the same curvature and formed by a pressure plate with a female-shaped spherical surface and a spherical surface of the pressure plate with a female-shaped spherical surface is applied to the workpiece so that the grooves are female. By applying a pressing load between the spherical surfaces and deforming the workpiece along each spherical surface while the workpiece is held in a state where it can come into contact with the spherical surface of the shape, the workpiece is moved along the above-mentioned striations within a vertical section of t. This is a method for cutting a plate-like brittle material, which is characterized by cutting by bending.

In this way, in the present invention, since the workpiece is held between the spherical seats and deformed along the spherical surface, a bending moment proportional to the curvature of the spherical surface is automatically induced in the workpiece.
Moreover, the tensile stress caused by the bending is generated on the surface where the striations are provided, and at the striations, the cutting of the crop is carried out almost simultaneously and reliably in all longitudinal sections along the pre-formed striations. Reduce.

(Example) Hereinafter, an example of the present invention will be described with reference to the attached drawings.

AI+A2 in Figure 1 is a female spherical vessel with a radius of curvature R, and an acrylic resin (abbreviated as PMMA) with h.
T is a plate-shaped workpiece made of ceramics or the like to be cut.
It is held between the spherical seats formed by Q2.

At this time, on one surface of the workpiece T, as shown in FIGS. is such that the groove N can come into contact with the female spherical surface QI indicated by A.

Under such conditions, each of the above-mentioned processed plates A, , A.

If a pressing load W is applied between the two, and the workpiece T is deformed along the spherical surface Q+Qz, a uniform bending moment tra will be induced in T, and the tensile stress caused by the bending will create striations on the workpiece. This occurs on both sides, and stress concentration due to tension occurs at the striations.

The tensile strength of ceramic materials is much smaller than the compressive strength; for example, the tensile strength of soda glass is about 5 f.
/mrr? On the other hand, the compressive strength is about 80”yf/
It is m75. Therefore, if the radius of curvature R of the above-mentioned spherical surface is appropriately selected, the workpiece will be cut due to stress concentration in the grooves, but at this time, the bending moment induced in the workpiece is uniform, so Cutting an object by bending occurs in the same way in all longitudinal sections along a single line mark previously provided in the shape to be cut.

In cutting according to the present invention, the radius of curvature R of the spherical surface Q+ (h) is selected as follows.

R, < R < R, [11 Here, R1 and R2 are the radius of curvature when the workpiece without scratches and the workpiece with scratches bend and fail, The thickness of the workpiece is h, the thickness of the material is a”
(3) R, = Go πh where E is the Young's modulus α of the workpiece and the stress concentration coefficient of the striations. As shown in equation (1) above, R > R, so the workpiece is cut other than the striations. It doesn't happen at R〈R
1, it is ensured that the cutting of the workpiece occurs in the longitudinal section along all the striations.

(Experimental Example) As an experimental example, an example of cutting a soda glass plate and an alumina ceramic plate will be described below.The Young's modulus E and tensile strength σb of these materials are as follows.

Soda glass: E=70001Lp, 7'/m77J
σb=5'yf/mm Alumina ceramics: E
= 280001Lp, 7”/m7%σb=21 to 77
In the m' experiment, the grooves in the shape to be cut were created using an ordinary glass cutter. At that time, the stress concentration factor of the striations is 4 in α
．． It was 5.

(Experimental Example I) The workpiece is a square plate of soda glass with a thickness h ” 1.1 u and one side of toomm.A groove as shown in Fig. 3 was provided on this machine, and 24 small plates were When attempting to simultaneously cut a rectangular plate, the radius of curvature at which this glass plate breaks due to bending is calculated from equations (2) and (3) above.When there is no striation, it is R, medium 510□ , when there are striations, it becomes 230 ozm in R2, so in the experiment, the radius of curvature is R = 10θ as a spherical surface that fully satisfies Equation 11.
I used one from O. The result is that the workpiece is cut as expected, t0, that is, the cut is made in all longitudinal sections along the striations.

Twenty-four rectangular plates were collected.

(Experimental row ■) The thickness of the workpiece is h = 2.7, 3.7, 4.7 mm.
There are three types of soda glass plates with each side having a width of 7 oma. In the experiment, we created stripes that divided the glass plate into 16 equal parts, and attempted to cut 16 small square plates simultaneously.
When calculating 1+R2, it looks like the ng1 table, so in the experiment, R is a spherical surface that satisfies the above equation (1).
``3000 wux was used. All cutting of the workpiece in this case was performed as expected.

1st table Workpiece coral thickness h” 1. 1 side is 10 oz
It is a square plate of alumina ceramics with a diameter of m. In the experiment, this square plate was divided into 25 equal parts, and an attempt was made to cut 25 small squares at the same time. The above-mentioned R1TR2' about the alumina ceramic plate! : When calculated from formulas (2) and (3), R1" 450 ails R2"
200 oO, so in the experiment, R = 1000. I used the one from In this case as well, O-cutting was performed as expected.

In addition, during machining, glass fragments may be generated and the glass may adhere to the workpiece and the female mold or the spherical surface of the female mold and have an adverse effect on the surface of the workpiece. A flexible sheet member may be interposed between the workpiece and the workpiece by an appropriate method such as placing or adhering the sheet member to absorb glass fragments.

[Effects of the Invention] As explained above, in the method for cutting a plate-like brittle material according to the present invention, the plate-like brittle material, that is, the workpiece, can be deformed along a spherical surface by a relatively simple means. Cutting by bending is performed almost simultaneously and reliably on all longitudinal sections along the grooves previously provided in the shape to be cut.

Therefore, this cutting method is extremely useful and has a remarkable effect in industrial fields that require the cutting of large quantities of glass plates and various ceramic plates, such as in the production of integrated circuit and solar cell substrates. can play.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional elevational view showing an apparatus for carrying out an embodiment of the method for cutting plate-like brittle materials of the present invention, and FIGS. These are different plan views. A, Pressure plate A2 with a female spherical surface... Pressure plate N with a female spherical surface...Stripe Ql...Female spherical surface Q2...Female spherical surface T...・Workpiece (plate-like brittle material) Attorney Junji Kawachi

Claims (2)

[Claims] (1) On one surface of a plate-shaped brittle material containing ceramics, a groove in the shape to be cut is created in advance using a tool including a diamond cutter, and then a pressure plate with a female spherical surface and a male shape with approximately the same curvature are formed. With the plate-like brittle material being held between the two spherical seats of the pressure plate having spherical surfaces such that its striations can come into contact with the female spherical surface, a pressing load is applied between the spherical surfaces. By applying this and deforming the plate-shaped brittle material along each spherical surface, a bending moment is automatically induced in the plate-shaped brittle material, and the plate-shaped brittle material is bent along the scratches. A method for cutting plate-like brittle materials including ceramics, characterized by cutting in a vertical cross section. (2) The plate-like brittle material according to claim 1, in which a flexible sheet member is interposed between the plate-like brittle material and at least one of the pressure plates having a female or male spherical surface. How to cut the material.