JPH05242799A - Manufacture of disc-like part having fine hole comprising bowl part and straight part in center - Google Patents

Abstract

PURPOSE:To improve the accuracy of manufacture by processing an outer diameter on the basis of holes which are made in a bowl part and a straight part beforehand, when a fine hole is opened in the center of a disc-like part, or processing the outer diameter on the basis of the hole whose straight pat is set as the top face, bowl part is set as the bottom face, and under which is provided a reflecting mirror. CONSTITUTION:A strip material 16 made of SUS304 is died into a plate 17 by dies 6, 7, a recessed part 8 is formed on its surface, and a recessed part 9 which is recessed more deeply than the recessed part 8 is formed in its center. A disc processed like this is set on a bottom mold receiving base 10, a conical blind hole 12 is formed by a punch 11 whose tip is conical with the angle of 60 deg. and whose material is extremely hard, and a projecting part 13 which projects on the other side of the hole 12 is eliminated by grinding. The disc obtained thereafter is removed from the receiving base 10, the hole 12 is perforated by a reamer tool 14 whose end is conical with the angle of 30 deg. and whose material is extremely hard, so as to eliminate the projection 15 in the same way as before and the outer diameter is processed with a precise grinder. Then it is recommended to set a reflecting mirror.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an image pickup tube, an electron microscope,
The present invention relates to a method of manufacturing a disk-shaped component having fine holes at its center, which is called an aperture, an orifice, or a diaphragm, which is used in a gas detector or the like.

[0002]

2. Description of the Related Art One minute hole is machined in the center of these disk-shaped parts.
The concentricity of the hole with respect to the outer diameter of the disk is required. Conventionally, as shown in FIG. 2, a band 16 is punched into a disc shape by the upper die 6 and the lower die 7, and then the punched disc 17 is used.
A concave portion 8 having the same inner diameter as the outer diameter of the disc and a concave portion 9 in the central portion.
The conical blind hole 12 is machined as shown in FIG. 3 by the lower die pedestal 10 and the punch tool 11 which are provided, and then the bulged portion 13 on the opposite side of the conical blind hole 12 is polished as shown in FIG. Removed and then FIG.
As shown in FIG. 6, a through hole is formed by processing with a reamer tool 14, and then, as shown in FIG. The obtained disk-shaped component 1 was obtained. However, in the above method, the fitting precision of the disc and the recess of the lower die cradle was insufficient, and therefore the concentricity of the hole with respect to the outer diameter of the disc was insufficient.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and stabilizes the accuracy of the concentricity of holes with respect to the outer diameter of a disc.
It is intended to provide a method of manufacturing a disk-shaped component such as an aperture, an orifice, and a diaphragm, which is improved.

[0004]

The technical means for solving the above-mentioned problems is to form a fine hole consisting of a dish and a straight portion in the central portion, and then perform the outer diameter processing with reference to the hole. It is a feature.

Still another technical means is to mount the straight portion of the hole as the upper surface and the dish portion as the lower surface, install a reflecting mirror under the hole, and perform outer diameter processing with the hole as a reference. It is characterized by that.

[0006]

According to the disk-shaped component manufacturing method of the present invention having the above-described structure, the outer diameter is machined based on the hole without being affected by the fitting accuracy as in the conventional case. The diameter and the concentricity of the holes are accurately finished.

Further, since the light is transmitted through the upper part of the hole and reflected by the reflecting mirror, the outline of the hole becomes clear and the hole can be accurately referenced. The reflecting mirror may be a convex mirror or a concave mirror.

[0008]

EXAMPLES Examples and conventional examples will be described below. First, as shown in FIG. 2, a disc having an outer diameter of 15.1 mm is punched from a band material having a material of SUS304 and a plate thickness of 1 mm with dies 6 and 7, and then an inner diameter of 15.12 mm and a depth of 0.5 mm as shown in FIG. The circular plate is set on the lower die pedestal 10 having a concave portion 8 and a concave portion 9 having an inner diameter of 1.5 mm and a depth of 1.0 mm in the central portion, and a punch tool 11 made of a super hard material with a conical tip and an angle of 60 degrees. At the conical blind hole
12 is machined, and then the bulging portion 13 on the opposite side of the conical blind hole 12 is removed by polishing as shown in FIG. 4, and then the tip conical angle is 30 ° and the straight portion diameter is 0.05 mm as shown in FIG. A through hole is formed by using a reamer tool 14 made of a super hard material, and then the protrusion 15 is removed by finish polishing, and the outer diameter is 15.1 mm as shown in FIG.
A disc 1 of 0.05 mm was obtained. This is a conventional example.

Next, the outer diameter 1 produced by the conventional method
As shown in FIG. 1, a 5.1 mm disc 1 is placed and fixed on the tip 2 of the rotary shaft of a precision grinding machine, moved along the X and Y axes, and rotated with reference to the fine holes 3 in the disc 1. Adjust, and then perform outer diameter processing with whetstone 4, outer diameter 15.0 mm, hole diameter 0.05
A disc-shaped component 1'having a size of mm was obtained. A reflecting mirror 5 is installed at the tip 2 of the rotary shaft of the precision grinder. This is an example.

However, as a result of measuring the concentricity between the disk outer diameter and the hole in the example and the conventional example, it was 0.003 in the conventional example.
While the deviation was ˜0.005 mm, in the example, the finish was 0.002 to 0.003 mm with high accuracy.

[0011]

As described above, according to the present invention, the outer diameter is machined with reference to the hole, and the contour of the hole is made clear by the reflecting mirror, so that the disc outer diameter and the concentricity of the hole are accurate. It has an excellent effect that a disk-shaped component having a fine hole having a dish portion and a straight portion in a good central portion can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional manufacturing process.

FIG. 3 is a cross-sectional view showing a conventional manufacturing process.

FIG. 4 is a cross-sectional view showing a conventional manufacturing process.

FIG. 5 is a cross-sectional view showing a conventional manufacturing process.

FIG. 6 is a cross-sectional view showing a conventional manufacturing process.

[Explanation of symbols]

 1 ′ Disc-shaped part 2 Rotating shaft tip 3 Fine hole 4 Grinding stone 5 Reflector

Claims (2)

[Claims] 1. A center portion comprising a dish and a straight portion, characterized in that after forming a fine hole having a dish portion and a straight portion in the center portion, an outer diameter machining is carried out based on the hole. A method for manufacturing a disk-shaped component having fine holes. 2. A center portion characterized in that a straight portion of a hole is placed as an upper surface and a dish portion is placed as a lower surface, and a reflecting mirror is installed on the lower side of the hole to perform outer diameter processing with reference to the hole. A method for manufacturing a disk-shaped component having fine holes including a plate portion and a straight portion.