JPH11310428A - Glass scrubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass scrubber capable of preventing the damage to the cutting portion of the glass scrubber and obtaining its desired head width. SOLUTION: Superhard films 12A and 12B are formed on a pair of substrates 11A and 11B, respectively, and subsequently adhered to each other with an adhesive 13. Both the sides of the superhard films 12A, 12B are thus supported on the substrates 11A, 11B, and the damage to a cutting portion C, such as the breakage or peeling of the films due to an outer force acting on the cutting portion C can be prevented. Since the superhard film 12A, 12B are adhered to each other, a film material impossible to make an objective film thickness can also give a desired head width and improve a cutting ability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass scriber used as a tool for cutting a sheet glass material such as a liquid crystal glass or a watch glass.

[0002]

2. Description of the Related Art Conventionally, a glass scriber has been used to cut a plate-like glass material such as a liquid crystal glass or a watch glass. This glass scriber moves the cutting part provided at the tip thereof while pressing it against the glass surface to form a cutting line on the glass surface, and then applies pressure from the back surface of the glass to form the cutting line. The glass material is cut along the micro cracks generated at the time. Therefore, as shown in FIG. 10, the applicant has formed a superhard film 2 such as a diamond-like carbon film or a titanium nitride film on the upper surface of a base material 1 made of stainless steel or the like, and A glass scriber was developed in which the superhard film 2 was projected from, and this was used as a cutting portion C ′. In this method, a cutting line is formed on the surface of a plate-like glass material as an object to be cut by a portion of the superhard film 2 protruding from a tip 1a.

[0003]

However, since the superhard film 2 in the above-mentioned glass scriber is supported only on one side by the substrate 1, as shown in FIG. There was a problem that the film was easily broken by external force F, such as "film peeling" and "film peeling".

In addition, as shown by a symbol A in FIG. 9, the head width, ie, the film thickness, required for the scriber head has the largest crack depth (high cutting force) with respect to the object to be cut, and has the best characteristics as a scriber head. A film thickness of about 5 μm is required to obtain the film. However, when a diamond-like carbon film (DLC film) is used as the superhard film, the film stress at the time of film formation is large as shown in FIG. The obtained film quality is obtained up to about 2 μm. Thus, there is a problem that a desired head width cannot be obtained with the conventional configuration.

The present invention has been made in view of the above problems, and has as its object to provide a glass scriber which can prevent a cutting portion from being damaged and can obtain a desired head width.

[0006]

In order to solve the above-mentioned problems, in the present invention, a superhard film is supported from both sides by a pair of base members to prevent a film breaking defect such as a film crack or a film peeling of a cutting portion. Thus, in the invention according to claim 1, the superhard film is formed only on one of the pair of base members. This configuration is effective for a cemented carbide film having a relatively small film stress such as a titanium nitride film and having a stable film quality even with a desired film thickness. On the other hand, in the invention according to claim 2, a superhard film is formed on both of the pair of base members, and this configuration has a relatively large film stress such as a diamond-like carbon film and is stable. It is effective for a superhard film whose film quality can be obtained only with a film thickness of about several μm, and a desired film thickness, that is, a head width can be obtained by bonding the superhard film formed on each base member. . Further, in any of the above configurations, the plate-shaped glass material can be cut under the most suitable conditions as a scriber head by using the superhard film portion projected and formed from the base end portion as the cutting portion.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a glass scriber according to an embodiment of the present invention. The base material 11 is a pair of base members 11A.
And 11B, and a superhard film (in this embodiment, diamond-like carbon (DLC)) is provided in an area corresponding to the base end portion 11a (of course, the entire area of the film forming surface may be used).
Films) 12A and 12B are formed respectively. The pair of base members 11A and 11B are bonded via an adhesive 13. More specifically, the pair of base members 11
The adhesive 13 is poured into the gap when A and 11B are bonded together, and the superhard films 12A and 12B are also adhered to each other with the adhesive. At this time, since the DLC film has poor affinity for the adhesive, a tungsten film having a high affinity for the adhesive is formed on the uppermost layer at the time of film formation.
In the case of other superhard films, for example, a titanium nitride (TiN) film or a chromium nitride (CrN) film, it is unnecessary.

The superhard film portion protruding from the base end portion 11a is a cutting portion C, and its head width T is
The thickness is determined by the sum of the thicknesses t, t of the respective superhard films 12A, 12B. That is, if each of the superhard films 12A and 12B is formed in a thickness of about 2 μm, a cutting portion C having a head width T of about 5 μm is formed. In addition, the protrusion formation of the superhard film portion from the base material tip 11a
This is performed by polishing the front end portion 11a of the base material. At this time,
The constituent material of the base material 11 is preferably lower than the hardness of the DLC film. For example, a high-speed tool steel or a cemented carbide that has been subjected to a quenching treatment is preferable.

As shown in FIG. 3, the glass scriber constructed as described above is a plate-like glass material 15 to be cut.
The cutting line C is moved in the direction indicated by the arrow D while pressing the cutting portion C in a state perpendicular to the surface of the cutting line 17 to form the cutting line 17. At this time, since the cemented carbide portion is supported on both sides by the base members 11A and 11B, a stable cutting ability is secured without causing damage such as film breakage or film peeling at the cutting portion C,
The service life is also prolonged. In addition, since the thickness of the DLC film of about 5 μm, which cannot be obtained with a conventional glass scriber having a one-sided support structure, can be obtained, the characteristics of the DLC film can be sufficiently exhibited, and the plate can be formed with an optimum head width. The glass material 15 can be cut, and the cutting ability can be greatly improved as compared with the related art. Although not shown, the base material 11 is assumed to be held in a holder portion of the scribe device.

FIGS. 4 to 6 show modifications of the shape of the base end portion 11a. That is, the above-described tip 11
The shape of “a” is a quadrangular pyramid, but if it is a circular arc-shaped tip 11a ′ shown in FIG. 4 or a tip 11a ″ formed by the intersection of an arc and a straight line shown in FIG. Since the tip portion 11a 'or 11a "can be processed / corrected by using the curved surface lapping process as shown in FIG. 1, the polishing operation can be performed much more easily than in the past. This curved lapping is performed by winding the wrapping tape L between _two rollers R ₁ and R ₂ and reciprocating the wrapping tape L as indicated by an arrow P. Also, in this process, the superhard film 12 has the tip portions 11a ', 1
1a ".

Although the embodiment of the present invention has been described above, the present invention is, of course, not limited to this, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the superhard films 12A and 12B are formed on both of the pair of base members 11A and 11B. Of course, the superhard film is formed on only one of them. You may. In this case, a titanium nitride film or the like having a relatively small film stress is preferable as the super hard film. What is necessary is just to stick together. Since the cutting portion obtained in this way is supported on both sides by the base member, film breakage and film peeling are prevented as in the above-described embodiment.

[0014]

As described above, according to the glass scriber of the present invention, the following effects can be obtained.
That is, according to the first aspect of the present invention, damage such as cracking or peeling of the superhard film in the cutting portion can be prevented, and the life of the cutting portion can be prolonged. According to the second aspect of the invention, in addition to the above-described effects, a desired head width can be obtained even with a type of ultra-hard film in which stable film quality can be formed only slightly. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing a glass scriber according to an embodiment of the present invention.

FIG. 2 is an enlarged view of the main part.

FIG. 3 is a perspective view illustrating the same operation.

FIG. 4 is a side view schematically showing a modification of the shape of the tip of the glass scriber.

FIG. 5 is a side view schematically showing a further modified example of FIG.

FIG. 6 is a front view of the same.

FIG. 7 is a side view schematically showing a polishing process at the tip end of FIG.

FIG. 8 is a diagram showing the relationship between the film thickness and the film strength of a diamond-like carbon film.

FIG. 9 is a diagram illustrating a relationship between a head width of a cutting unit and a cutting ability.

FIG. 10 is a perspective view showing a conventional glass scriber.

FIG. 11 is a partially cutaway side view for explaining the same operation.

[Explanation of symbols]

11 ... substrate, 11A, 11B ... base member, 11a, 1
1a ′, 11a ″..., Tip, 12, 12A, 12B.
... Super hard film, 13 ... Adhesive, 15 ... Plate glass material, 1
7: Cutting line, C: Cutting section.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Makio Onodera Takae Niida, Nakata-cho, Tome-gun, Miyagi Prefecture 30 Kagano Border, Sony Precision Magne Co., Ltd. 30 Kagano Sakai Sony Precision Magne Co., Ltd.

Claims (6)

[Claims] Claims: 1. A base material having a cutting portion at a tip portion thereof,
In the glass scriber for cutting a sheet glass material at the cutting portion, the base material is formed by bonding a pair of base members, and the superhard film formed on one of the pair of base members is formed by the pair of base members. A glass scriber, wherein the cutting portion is made of the superhard film protruding from a front end portion of the base material. 2. The method according to claim 1, wherein the superhard film is formed on an entire region of a film forming surface of the one base member or on a region of the front end portion, and the pair of base members are bonded with an adhesive. The glass scriber according to claim 1, wherein: 3. A cutting part is provided at a tip part of the base material,
In a glass scriber that cuts a plate-like glass material at this cutting portion, the base material is formed by bonding a pair of base members each having a superhard film formed thereon, between the film forming surfaces of the superhard film, The glass scriber, wherein the cutting portion is made of the superhard film protruding from a front end portion of the base material. 4. The ultra-hard film is formed on the entire region of the film forming surface of each of the pair of base members or on the region of the distal end portion, and the pair of base members are bonded with an adhesive. The glass scriber according to claim 3, wherein: 5. The glass scriber according to claim 3, wherein said superhard film is a diamond-like carbon film. 6. The glass scriber according to claim 1, wherein a shape of a tip portion of the base material is an arc or an intersection of an arc and a straight line.