JP2001162345A - Method for forming bottomed cylindrical metal body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bottomed cylindrical metal body with a simple constitution in a short time with excellent accuracy. SOLUTION: A method for forming the bottomed cylindrical metal body 10 in which an opening part 12 is formed in the center of a bottom surface 10a, and a notched portion 14 notched from an opening end 10c side is formed at least in a part of a circumferential wall 10b comprises a first pressing process to form a rectangular metal plate with a part of one long side of a pair of long sides parallel to each other notched in square by punching a metal flat plate, a first bending process to bend each end in the longitudinal direction of the metal plate in the same direction, a second bending process to form a cylindrical metal body with the notched portion 14 notched from one opening end side formed at least on a part of the circumferential wall 10b by bending a center portion of the metal plate in the same direction as each end and bringing the bent ends into contact with each other to form the metal plate in a ring shape, and a second pressing process to bend the other opening end side of the cylindrical metal body inwardly over the whole periphery to form the bottom surface 10a with an opening part 12 formed in the center portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical shape in which an edge portion at one end is narrowed inward over the entire circumference, and at least a portion of a peripheral wall is formed with a cutout cut out from the other end. The present invention relates to a method for forming a metal body.

[0002]

2. Description of the Related Art CD (Compact Disc), CD-
2. Description of the Related Art In a drive device (read device, read / write device) of various storage media such as R, CD-RW, and MO (magnetic optical disk), an optical pickup is used to read data from a disk as a recording medium. It is necessary to adjust the optical axis of the lens used in the optical pickup. The lens is housed and held in a component such as the metal body 10 shown in FIG. 1, and the lens is tilted by tilting the metal body 10. The optical axis was adjusted.
The structure of the bottomed cylindrical metal body 10 will be described. The overall shape is a cylindrical shape, an opening 12 is formed at the center of the bottom surface 10a (the lower end side in FIG. 1), and at least one of the peripheral walls 10b is formed. The portion has a cutout portion 14 cut from the opening end (the end opposite to the end where the bottom surface 10a is formed) 10c. In detail, this bottom 1
The outer surface of Oa is located on a virtual spherical surface having the same radius.

[0003] Conventionally, as a method of forming the bottomed cylindrical metal body 10 of this shape, an opening 12 is located on the bottom surface 10a by drawing a metal flat plate having a circular opening. Formed into a cup shape (bottomed cylindrical body)
The notch 14 of the peripheral wall 10b is formed by post-processing using side cutting or cutting.

[0004]

However, in the conventional method of forming a cylindrical metal body having a bottom, many steps are required for drawing, and the shape of the blank before drawing is greatly affected by the condition of the drawing die. Therefore, it is necessary to repeat the trial and error in the mold making, and there has been a problem that the time until the completion is long. Further, since the notch 14 of the peripheral wall 10b of the cylindrical metal body 18 is formed by side cutting or cutting after drawing, stress is easily applied to the peripheral wall 10b and distortion is easily generated in the drawn shape. There is a problem that it is difficult to form a metal body.

Accordingly, an object of the present invention is to provide a simple process,
An object of the present invention is to provide a method of forming a bottomed tubular metal body that can accurately form a bottomed tubular metal body in a short time.

[0006]

That is, in the method of forming a bottomed cylindrical metal body according to the present invention, an opening is formed at the center of the bottom surface, and at least a part of the peripheral wall is cut from the opening end side. In the method of forming a bottomed cylindrical metal body having a notch formed therein, by punching out a metal flat plate, a rectangular shape in which a part of one long side of a pair of parallel long sides is cut into a square. A first pressing step of forming a metal plate, a first bending step of bending each end in the longitudinal direction of the metal plate in the same direction, and a center portion of the metal plate being the same as each end of the metal plate. By bending in the direction, the bent end portions are brought into contact with each other, and a metal plate is formed in a ring shape, a notch cut in from one opening end side is formed in at least a part of the peripheral wall. A second bending step of forming a tubular metal body;
A second pressing step of bending the other open end side of the cylindrical metal body inwardly over the entire circumference to form a bottom surface having an opening formed in a central portion.

[0007] According to this, drawing becomes unnecessary, the molding time can be shortened, and side cutting or cutting for forming a notch in the peripheral wall of the cylindrical metal body becomes unnecessary. It is possible to form the bottomed cylindrical metal body with high precision without acting.

[0008] Further, if a welding step of welding the respective ends contacted in the second bending step is provided between the second bending step and the second pressing step, the strength of the cylindrical metal body is reduced. It is possible to obtain a more accurate cylindrical metal body with a bottom. Further, in the second pressing step, the bottom surface may be formed into a shape whose outer surface is located on the same spherical surface.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method for forming a bottomed cylindrical metal body according to the present invention will be described below in detail with reference to the accompanying drawings. (First Pressing Step) In the first pressing step, a metal flat plate is punched to form one of the long sides (upper side 16a and lower side 16b in FIG. 2B) of a pair of parallel long sides (FIG. 2B).
(B) A rectangular metal plate 16 is formed in which a part on the upper side 16a) side is cut out in a square (meaning a square or a rectangle) as shown by a dotted line. In FIG. 2, each end side on one long side 16a side of the metal plate 16 is cut into a square, but, for example, only one end side on this one long side 16a side (the left end side in the figure or The position may be determined, for example, the right end side may be cut out in a rectangular shape, or the center portion on one long side 16a side may be cut out in a square shape instead of the end side. Also, because a flat plate is stamped out by pressing,
Since the notch can be formed by one press, the number of notches is not limited to one or two, but may be three.
The labor is the same even in a large number of places, and the required number may be formed as needed. Further, in the present embodiment, the central portion on one long side 16a side of the metal plate 16 is also slightly notched, and a rectangular notch portion having a smaller area than the notch portion on each end side is formed. I have. In the present embodiment,
It is formed in a shape symmetrical with respect to the center line M.

(First bending step) After the first pressing step,
As shown in FIG. 3, each end of the metal plate 16 in the longitudinal direction is
In the same direction (on the same surface side of the metal plate 16), it is bent by the same length to form a line-symmetric configuration with respect to the center line M.
More specifically, as a result of the notch on one long side 16a, the width of the metal plate 16 is reduced, and each end on the other long side 16b is bent. Further, in the present embodiment, each end of the metal plate 16 is bent in an arc-shaped cross section as an example, but may be bent in a straight line.

(Second Bending Step) After the first bending step, as shown in FIG. 4, a central portion (wide portion) of the metal plate 16 is gutter-shaped (cross-section) in the same direction as each end of the metal plate 16. Each of the ends bent in the first bending step is brought into contact with each other so that the end faces of the respective ends are in close contact with each other. Thereby, the other long side 16b side of the pair of long sides of the metal plate 16 is formed in a ring shape, and one long side 16a is formed in a substantially semicircular cross section or a substantially U-shaped cross section, The metal plate 16 becomes a cylindrical metal body 18. In other words, the notch 14 cut from the one open end (the upper open end in FIG. 4B) 18a side.
Can also be said to be a cylindrical metal body 18 formed on at least a part of the peripheral wall 18b. The planar shape of the cylindrical metal body 18 is
As shown in FIG. 4A, a line based on a plane passing through a contact portion A at each end of the metal plate 16 and a small notch B formed at the center of one long side of the metal plate 16 is used as a reference. It has a symmetrical planar shape.

(Welding step) After the second bending step, as shown in FIG. 5, the metal plate 1 contacted in the second bending step
6 are welded to each other. As a result, the contact portions A at the respective ends of the metal plate 16 that have been in contact with each other are integrated, and the strength of the cylindrical metal body 18 increases, and the dimensional accuracy when finally forming the bottomed cylindrical metal body 10 is improved. improves. Note that this welding step may be performed as needed, and may be omitted if unnecessary.

(Second pressing step) After the second bending step (after the welding step if there is a welding step), the other open end side of the cylindrical metal body 18 shown in FIGS. 4 (b), the other opening end side is bent inward over the entire circumference to form a bottom surface 10a having an opening 12 formed in the center. I do. This allows
A tubular metal body 1 is attached to a bottomed tubular metal body 10 as shown in FIG.
8 can be molded.

Next, the second pressing step will be described in more detail, together with the structure of the mold used in this step.
First, the mold will be described. The die includes a die 20 shown in FIG. 6, a punch 22 shown in FIG. 7, and a product guide 24 shown in FIG.

The punch 22 is made of a metal material.
The outer peripheral shape of the cross section along a plane orthogonal to the axis is set so as to match the shape of the inner peripheral surface of the cylindrical metal body 18, and the punch 22 is inserted in a state of being fitted exactly into the cylindrical metal body 18. It is a structure that can be done. Specifically, the above-described outer peripheral shape of the punch 22 is similar to the inner peripheral surface of the cylindrical metal body 18 and slightly larger. The end face of the tip of the punch 22 is formed into a curved surface so as to be located on the same virtual spherical surface in accordance with the inner bottom surface of a concave portion provided in the die 20 described later.

The product guide 24 is made of a metal material. As shown in FIG. 8B, the cross-sectional shape of the product guide 24 along a plane perpendicular to the axis is the cylindrical metal body 18 shown in FIG.
Is substantially the same as the cross-sectional shape along a plane perpendicular to the axis of That is, both members 18 and 24 have the same plate thickness,
The inner peripheral surface shape and the outer peripheral surface shape are the same. And FIG.
As shown in FIG. 8A, one end of the product guide 24 (FIG. 8)
On the end face 24a (at the lower end side of FIG. 3A), a fitting convex piece 26 having a circular arc cross section and a square front shape is provided so as to fit with the cutout portion 14 of the tubular metal body 18. FIG. 9 shows a state in which the product guide 24 is fitted on the punch 22. The product guide 24 is externally fitted to the punch 22 so that the fitting convex piece 26 is located on the tip side of the punch 22.

The die 20 has a recess 28 into which the cylindrical metal body 18 fitted to the punch 22 and fitted to the product guide 24 is inserted together with the punch 22. The cross-sectional shape of the inner peripheral surface of the concave portion 28 is set to a shape that matches the cross-sectional shape along the axial direction of the outer peripheral surface of the bottomed cylindrical metal body 10 that is the final product. Then, the inner bottom surface 2 of the concave portion 28
Like the tip end surface of the punch 22, 8a is formed into a curved surface located on the same virtual spherical surface according to the shape of the surface of the bottom surface 10a of the bottomed cylindrical metal body 10. In the present embodiment, the die 20 has an inner bottom surface 28 a
Is formed.

In the second pressing step, FIG.
First, as shown in FIGS.
As shown in FIG. 5, the cylindrical metal body 18 is externally fitted to the exposed distal end of the punch 22 fitted externally in a state where the fitting projection 26 of the product guide 24 fits into the cutout 14 of the cylindrical metal body 18. And let it be attached. In this state, the fitting projection 26 of the product guide 24 and the end surface 24a on which the fitting projection 26 is formed are connected to the cutout 14 and the cutout 1 of the tubular metal body 18.
4 is formed in close contact with the end surface 18a having almost no gap. Thereby, the cylindrical metal body 18 can be uniformly pressed toward the die 20 by the product guide 24. Further, in a state in which the cylindrical metal body 18 is mounted on the punch 22, the ring-shaped end (the lower end in FIG. 11) of the cylindrical metal body 18 slightly protrudes from the tip of the punch 22.

Next, as shown in FIG. 12, the punch 22 is inserted into the concave portion 28 of the die 20 together with the cylindrical metal member 18, and the cylindrical metal member 18 is pressed by the product guide 24. Punch 22
The end side 18c of the cylindrical metal body 18 protruding from the tip of
After coming into contact with the inner bottom surface 28a of the concave portion 28, the inner bottom surface 2
It is bent inward along 8a to be in a narrowed state. The bent portion of the cylindrical metal body 18 is further pressed between the tip end surface of the punch 22 approaching the inner bottom surface 28a of the concave portion 28 and the inner bottom surface 28a of the concave portion 28, and It has a portion 12 and is formed on the bottom surface having a predetermined thickness. Thereby, the bottomed cylindrical metal body 10 having the structure shown in FIG. 1 is formed. At the same time, the total length of the bottomed cylindrical metal body 10 pressed between the inner bottom surface 28a of the concave portion 28 by the product guide 24 is slightly shortened, and the excess meat is formed between the outer peripheral surface of the punch 22 and the concave portion 28. The entire shape of the bottomed cylindrical metal body 10 filled with the inner peripheral surface is also formed into a predetermined shape. Finally, the punch 22 and the product guide 24 are pulled out from the concave portion 28 of the die 20, and the bottomed cylindrical metal body 10 is taken out of the mold.
Is completed.

Although the present invention has been described in detail with reference to the preferred embodiments, the present invention is not limited to the embodiments, and many modifications may be made without departing from the spirit of the invention. Of course, this can be done. For example, the bottomed cylindrical metal body 10 of the above-described embodiment has a substantially cylindrical shape, specifically, a shape in which about half is a cylindrical body and the other is a polygonal cylindrical body. However, it may be a polygonal cylindrical metal body. It may be completely cylindrical. In addition, the bottom surface of the bottomed cylindrical metal body 10 is configured to be located on the virtual spherical surface, but may be configured to be located on a plane. In addition, as an example, an example in which the present invention is applied to a cylindrical metal body that holds a lens used in an optical pickup has been described.However, the present invention is not limited to this field. It can be applied to all necessary fields.

[0021]

According to the method of forming a bottomed cylindrical metal body according to the present invention, drawing is not required, and the forming time can be shortened. Therefore, productivity can be improved and manufacturing cost can be reduced. In addition, since a side cut or a cutting process is not required for forming a notch on the peripheral wall of the bottomed cylindrical metal body,
There is also an effect that no distortion acts on the peripheral wall, and the bottomed cylindrical metal body can be formed with high accuracy.

[Brief description of the drawings]

FIG. 1A is a plan view for explaining the shape of a bottomed cylindrical metal body, and FIG. 1B is a front view of the cut-away portion taken along line L-L in FIG. It is.

FIG. 2A is a plan view of a metal plate formed in a first pressing step in the method of forming a bottomed cylindrical metal body according to the present invention, and FIG. 2B is a front view thereof.

FIG. 3A is a plan view of a metal plate formed in a first bending step in the method for forming a bottomed cylindrical metal body according to the present invention,
(B) is a front view thereof.

FIG. 4A is a plan view of a tubular metal body formed in a second bending step in the method for forming a bottomed tubular metal body according to the present invention, and FIG. 4B is a sectional view taken along line LL in FIG. It is the front view seen from the notch part side in the notched state.

FIG. 5A is a plan view of a cylindrical metal body formed in a welding step in the method for forming a bottomed cylindrical metal body according to the present invention,
(B) is the front view which looked at the notch part side in the state cut off by LL in (a).

FIG. 6A is a plan view of a die used in a second pressing step in the method for forming a bottomed cylindrical metal body according to the present invention,
(B) is a front sectional view thereof.

FIG. 7A is a front view of a punch used in a second pressing step in the method for forming a bottomed cylindrical metal body according to the present invention, and FIG. 7B is a bottom view thereof.

8A is a front sectional view of a product guide used in a second pressing step in the method of forming a bottomed cylindrical metal body according to the present invention, and FIG. 8B is a bottom view thereof.

9A is a front view of a state in which the product guide of FIG. 8 is assembled to the punch of FIG. 7, and FIG. 9B is a bottom view thereof.

FIG. 10 is an explanatory diagram for explaining a second pressing step (a state before a cylindrical metal body is mounted on a punch).

FIG. 11 is an explanatory diagram for explaining a second pressing step (a state in which a cylindrical metal body is mounted on a punch).

FIG. 12 is an explanatory view for explaining a second pressing step (the pressed metal body is represented as a cross-sectional view).

[Description of Signs] 10 Bottomed tubular metal body 10a Bottom surface of bottomed tubular metal body 10b Peripheral wall of bottomed tubular metal body 10c Open end of bottomed tubular metal body 12 Opening 14 Notch

Claims (3)

[Claims] 1. A method for molding a bottomed cylindrical metal body having an opening formed in the center of a bottom surface and a cutout formed in at least a part of a peripheral wall from an opening end side. A first pressing step of forming a rectangular metal plate in which a part of one long side of a pair of parallel long sides is cut out in a rectangular shape by punching; each end of the metal plate in a longitudinal direction; A first bending step of bending the portion in the same direction; and bending the central portion of the metal plate in the same direction as each end of the metal plate to bring the bent ends into contact with each other, thereby forming a ring on the metal plate. A second bending step of forming a cylindrical metal body in which a notch cut from one opening end side is formed on at least a part of the peripheral wall by forming the cylindrical metal body, The opening end is bent inward over the entire circumference to form an opening at the center Method of molding a bottomed cylindrical metal member, characterized by comprising a second pressing step of forming the the bottom. 2. The method according to claim 1, further comprising a welding step for welding the ends contacted in the second bending step between the second bending step and the second pressing step. A method for forming a bottomed cylindrical metal body according to the above. 3. The method for forming a bottomed cylindrical metal body according to claim 1, wherein in the second pressing step, the bottom surface is formed into a shape whose outer surface is located on the same spherical surface. .