JP2001121091A - Method for cleaning mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning method capable of cleaning a transfer surface, a side surface, and a side step part of a mold at the same time when a mold matrix for press-molding a glass substrate is cleaned, and of stably obtaining a mold free from a defect without requiring any manual work. SOLUTION: A circular mold 10 is clamped with an upper brush 30 and a lower brush 40, and the brushes are rotated individually. A guide bar 50 is installed so as to be opposed to the side surface of the mold 10. Abrasive bristles 31 near the guide bar 50 are pressed and bent sequentially to abrade a side surface and a side step part 11 of the mold. Thereby the upper and lower surfaces, the side surface and the step part 11 of the circular mold 10 can be brush-cleaned at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of cleaning a disk-shaped molded glass material used for a disk-shaped glass substrate used for an optical disk, a magnetic disk, a magneto-optical disk and the like.

[0002]

2. Description of the Related Art When a disk-shaped glass substrate is produced by press molding, for example, as disclosed in Japanese Patent Publication No. 5-42373, a mold in which a heat-resistant base material is coated with an oxidation-resistant metal thin film is used. Used. The press mold for the disc-shaped glass substrate is disc-shaped, and when making the mold, the press surface of the heat-resistant base material is polished smoothly with oily diamond abrasive grains, and the oxidation-resistant metal film is sputtered. Film is formed to obtain a press die.

[0003] In order to maintain a good adhesion to the heat-resistant base material even at high temperature and high pressure during glass press molding and to form a transfer surface free from defects, the oxidation-resistant metal film must be formed by sputtering when the pressed surface is polished smoothly. It is necessary to remove oily abrasive particles that adhere to the surface as foreign matter before sputtering. For this reason, brush cleaning is performed in which a rotating mold is sandwiched between a pair of rotating brushes facing each other and the pressing surface and the back surface are rubbed. However,
The foreign particles also wrap around and adhere to the side of the molding die,
In addition, since the side surface has a step to fix it to the press head of the molding machine, brushes attached in the direction of rubbing the press surface can sufficiently remove foreign particles adhering to the side or side step. Cannot be removed. For this reason, conventionally, the side surface and the side step portion are manually wiped and cleaned before the brush cleaning.

[0004]

However, in the conventional cleaning method, manual wiping cleaning requires skill, so that much wiping remains. Further, the wiping cleaning of the side surface and the side surface step portion and the cleaning of the mold transfer surface are performed. Since the brush cleaning of a certain oxidation-resistant metal film deposition surface is performed separately, foreign particles removed from the side step portion flow around to the film deposition surface and become nuclei of defects of the oxidation-resistant metal film in the deposition process. I was For this reason, a mold having no defect could not be obtained stably, and press molding advantageous in productivity could not be used for disc production.

The present invention solves the above-mentioned problems of the prior art, and simultaneously cleans the mold transfer surface, the side surface, and the side step portion when cleaning the base material of the press-molding die for the glass substrate, thereby forming a defect-free mold. An object of the present invention is to provide a mold cleaning method capable of stably obtaining a mold without manual intervention.

[0006]

To achieve the above object, the present invention has the following arrangement.

A first method of cleaning a mold according to the present invention is directed to a method of cleaning a mold in which a rotating circular mold is sandwiched between a pair of opposed rotating brushes and rubbed, and is guided to face a side surface of the circular mold. A rod is provided, and the brush of the rotating brush is bent by the guide rod in a side direction of the circular mold to rub the side surface of the circular mold. According to this cleaning method, the brush bristles are automatically bent in the lateral direction by the guide rods, and the tips of the bristles are pressed against the side surface or the side step of the circular mold and rubbed. And the side step can be washed at the same time, and a mold having no defect can be stably obtained without manual operation.

Next, a second method of cleaning a mold according to the present invention is a method of cleaning a mold in which a rotating circular mold is sandwiched between a pair of opposed rotating brushes and rubbed. A brush corresponding to the side surface is implanted toward the side surface of the circular mold. According to this cleaning method, the bristles corresponding to the side surfaces of the circular mold of the rotating brush are planted toward the side surfaces of the circular mold. As a result, the mold transfer surface, the side surface, and the side surface step can be washed at the same time, and a molding die free from defects can be stably obtained without manual intervention.

[0009]

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

(Embodiment 1) FIG. 1 is a plan view for explaining a mold cleaning method according to Embodiment 1, and FIG. 2 is a mold cleaning method according to Embodiment 1 shown in FIG. FIG. 6 is a cross-sectional view for explaining the method.

The circular mold 10 has a step 11 formed on the outer peripheral side surface thereof.
1 and 22, it is rotatably supported. Roller 2
0 is rotationally driven in the direction of the arrow by a motor (not shown),
The circular mold 10 is rotated by rollers 20 in the direction of the arrow in FIG. In the upper brush 30 and the lower brush 40,
Nylon brushes 31 each having a fiber diameter of 0.1 mm are planted. The upper brush 30 and the lower brush 40 sandwich the circular mold 10 from above and below while making the brush 31 contact the upper and lower surfaces of the circular mold 10. The upper brush 30 and the lower brush 40 are supported by the motor 32 and the motor 42, respectively, and are driven to rotate. As shown in FIG. 2, a guide rod 50 made of a wear-resistant material such as ceramics is provided at a position facing the side surface of the mold 10 and the step portion 11. Further, since the guide rod 50 is installed in a region facing the upper and lower brushes 30 and 40, the brush 31 also comes into contact with the guide rod 50, and the contacted brush 31 is placed on either side of the guide rod 50. Deform to escape. The bristles 31 that have escaped to the side of the circular mold 10 are pressed against the side surface and the side step 11 of the mold 10. As a result, the circular mold 10, the upper brush 30
When the lower brush 40 and the lower brush 40 are respectively rotated, the guide rod 5
The brushes 31 approaching 0 can be sequentially pressed and bent, and can rub the side surface and the side step portion 11 of the mold 10.

With the above configuration, an IP of 5 liter / min is used.
In the A (isopropyl alcohol) flow, the circular mold 10 having an outer diameter of φ85 mm excluding the step 11 and an outer diameter of φ115 mm of the step 11 is rotated at a rotation speed of 100 rpm, and both the upper brush 30 and the lower brush 40 are rotated at 120 rpm. And treated for 5 minutes. For comparison, a circular mold whose side and side step portions were wiped and cleaned was prepared as shown in FIGS.
Using the same cleaning device as the cleaning device of No. 2, only the pressed surface and the back surface were similarly subjected to brush cleaning.

After washing, the substrate was rinsed by leaving it in an IPA flow of 10 liter / min for 5 minutes, dried in an IPA steam bath, and observed and evaluated with a VARIOUS visual inspection device manufactured by KAZAMA Engineering Co., Ltd. When only brush cleaning was performed, 10 foreign substances having a size of 1 μm or more were observed on the press surface and 30 or more foreign substances were found on the side step portion. Not found.

(Embodiment 2) FIG. 3 is a cross-sectional view for explaining a mold cleaning method according to Embodiment 2. Figure 1
Members having the same functions as those in FIG. 2 are denoted by the same reference numerals, and detailed description is omitted.

The present embodiment differs from the first embodiment in the manner in which the upper brush 30 and the lower brush 40 are planted.
As shown in FIG. 3, the upper brush 30 and the lower brush 40
The bristles 31 of the peripheral portion 33 corresponding to the side surface of the circular mold 10 and the step portion 11 are attached to the side surface of the circular mold 10 and the step portion 11.
The hair is being planted. As a result, foreign matter on the upper and lower surfaces of the circular mold 10 and foreign matter on the side surface and the step portion 11 can be simultaneously removed.

[0016]

As described above, according to the present invention,
The foreign matter on the mold transfer surface and the foreign matter on the side surface and the side step portion can be removed at the same time, and a press-molding mold having no defect can be stably obtained without manual operation.

[Brief description of the drawings]

FIG. 1 is a plan view for explaining a mold cleaning method according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining a mold cleaning method according to the first embodiment shown in FIG.

FIG. 3 is a cross-sectional view for explaining a mold cleaning method according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 circular mold 11 step 30 upper brush 31 brushing 32 motor 40 lower brush 42 motor 50 guide rod

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B116 AA46 AB34 AB42 BA02 BA13 CC01 CC03 CC05 3B201 AA46 AB34 AB42 BA02 BA13 BB95 CB22 CC01 CC11 CC21

Claims (2)

[Claims] 1. A method of cleaning a mold in which a rotating circular mold is sandwiched between a pair of rotating brushes facing each other, wherein a guide rod is provided to face a side surface of the circular mold, and a brush of the rotating brush is provided. Is bent in the direction of the side surface of the circular mold by the guide rod, and rubs the side surface of the circular mold. 2. A method of cleaning a mold in which a rotating circular mold is sandwiched between a pair of rotating brushes facing each other, and a brush corresponding to a side surface of the circular mold of the rotating brush has a brush corresponding to a side of the circular mold. A mold cleaning method characterized in that hairs are planted toward the side.