JP2554092B2 - Metal plate processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is most suitable for application to a method of processing a chassis in a tape recorder, for example, and is a guide part for guiding sliding parts or rotating parts. The present invention relates to a method for processing a metal plate having a retaining portion that prevents the component from coming off.

[Outline of Invention]

According to the present invention, a metal plate is provided with a guide part for slidably or rotatably guiding a sliding part or a rotating part, and a retaining part continuously provided at the tip of the guide part for preventing the part from coming off. In the method for processing a metal plate integrally formed with a metal plate, a tubular part is formed on the metal plate, and then the metal plate and the tubular part are molded to form a guide part and a retaining portion having a thinner wall thickness than the guide part. After molding and attaching the parts to the guide, by bending only the retaining part,
The guide part for guiding the component and the retaining part for preventing the component from coming off can be formed on the metal plate with extremely high precision, and the component can be attached with extremely high precision.

[Conventional technology]

As is well known, in a tape recorder or the like, various sliding parts or rotating parts such as a mode switching slider, a lever, and a rotary drive system gear are slidably or rotatably mounted on a metal plate serving as a chassis. There is something. In this case, conventionally, a guide shaft is vertically implanted on a metal plate, the base end of the guide shaft is caulked, and parts are inserted into the guide shaft through the guided holes provided therein, and the components are mounted. It has been common practice to attach a washer or the like to a locking groove provided at the tip to prevent the component from coming off the guide shaft.

[Problems to be solved by the invention]

However, in the conventional method as described above, a guide shaft, a washer, and the like, which are separate parts with respect to the metal plate, are required, and the work of planting and caulking these guide shafts and the work of attaching a washer and the like are required. However, the number of parts and the number of assembling steps are remarkably large, resulting in low productivity and high cost.

It should be noted that a tubular guide portion is integrally provided on the metal plate, the guided hole of the component is inserted and attached to this guide portion, and the tip of the guide portion is bent outward above the component to prevent the component from coming off. There is also a way to do so. However, in this case, the bending force applied to the distal end of the guide portion is transmitted to the base end of the guide portion, which changes the outer diameter and verticality of the guide portion, and it is difficult to mount components with high precision. There was a problem that could not be done.

Therefore, the present invention makes it possible to form a guide portion for guiding a component and a retaining portion for preventing the component from coming off on a metal plate with extremely high precision, and further, to attach the component with extremely high precision. It is a thing.

[Means for solving problems]

The present invention provides the first aspect of the above-described metal plate processing method.
The cylindrical portion protruding above the metal plate is formed by the burring process of No. 2, and then the metal plate and the cylindrical portion are formed by the second burring process to form a guide portion and a wall thickness thinner than that of the guide portion. A retaining portion is formed, and the component is inserted into the guide portion through a guided hole provided in the component and mounted on the metal plate, and then only the retaining portion is outwardly bent above the component by bending. It is configured to be bent.

[Action]

According to the present invention, the tubular portion is formed on the metal plate by the first burring process, and then the metal plate and the tubular portion are formed by the second burring process to form the guide portion and the retaining portion. Therefore, the guide portion and the retaining portion having a thickness smaller than that of the guide portion can be obtained with extremely high accuracy. And since only the thin wall retaining part is bent outward, bending force is not transmitted to the guide part at the time of bending, and changes in outer diameter and verticality of the guide part are prevented, and You can get accurate ones.

〔Example〕

An embodiment in which the present invention is applied to a method for processing a chassis in a tape recorder will be described below with reference to the drawings.

First, an example of use of the chassis processed by the method of the present invention will be described. As shown in FIG. 3, push buttons 1, 2 are provided at the tip.
Parallel sliding parts 3 and 4 made of thin plates to which is attached,
A sliding component 5 made of a thin plate arranged at a right angle to these sliding components 3 and 4 is a chassis due to the guided holes 6, 7 and 8 each made of an elongated hole provided therein. The guide portions 10, 11 and 12 are integrally provided on the metal plate 9 and are inserted into the guide portions 10, 11 and 12, respectively, and the arrows a, a ′, b and b ′, which are the longitudinal directions, respectively.
It is configured to be slidable in the c and c'directions. The sliding parts 3, 4, and 5 are urged in the directions of arrows a, b, and c by tension coil springs 13, 14, and 15 stretched between the sliding parts and the metal plate 9, respectively. In addition, rotating parts made of thin plates 16
However, it is inserted into a guide portion 18 integrally provided on the metal plate 9 by a guided hole 17 which is a circular hole provided therein, and is configured to be rotatable in the directions of arrows d and d '.
The sliding parts 3, 4, 5 and the rotating part 16 are guide parts.
The retaining portions 19, which are integrally provided at the tips of 10, 11, 12 and 18,
20, 21, and 22 prevent the guide portions 10, 11, 12, and 18 from coming off. The sliding components 3, 4, 5 and the rotary component 16 are formed of a metal plate or a synthetic resin mold.

Incidentally, the one push button 1 is configured as a mode switching push button such as a recording button, a reproduction button, a fast forward button, a rewind button, and the other push button 2 is configured as a stop button. Therefore, the sliding component 3 is configured as a slider for switching modes such as recording, reproduction, fast forward, and rewind, and the sliding component 4 is configured as a slider for stopping. The sliding component 5 is formed as a so-called lock plate, and a locking claw 23 and a non-locking claw 24 are integrally provided on a side surface of the sliding component 5. The moving parts 3 and 4 are configured to be engaged with a locking claw 25 and a non-locking claw 26 provided integrally with the free ends of the moving parts 3 and 4. That is, when the push button 1 is pushed and the sliding component 3 is slid in the arrow a'direction against the tension coil spring 13, the locking claw 25 is locked by the locking claw 23 and locked. .
However, at this time, the sliding component 5 is reciprocated in the directions of arrows c and c 'by the cooperative action with the extension coil spring 15. Further, in this locked state, when the push button 2 is pushed and the sliding component 4 is slid in the arrow b'direction against the tension coil spring 14, the non-locking claw 24 is pressed against the non-locking claw 26. The sliding parts 5
Is moved in the direction of arrow c ′ against the tension coil spring 15,
The locking of the locking claw 25 by the locking claw 23 is released, and the sliding component 3 is returned by the tension coil spring 13 in the direction of arrow a. Further, the rotary component 16 is configured as a gear of a rotary drive system, and the rotary component 16 is configured to rotationally drive other gears and the like (not shown).

Next, the guide portions 10, 1 provided integrally on the metal plate 9
1, 12, and 18 and the retaining portions 19, 20, 21 and 22 will be described in detail. Since these are almost the same, the following description will be made with respect to the guide portion 10 and the retaining portion 19.

First, in FIG. 2A, a cylindrical guide portion 10 having an outer diameter D ₂ vertically protruding at a height H ₁ on a metal plate 9 and a cylinder having a height H ₂ continuous with the tip of the guide portion 10 are provided. The retaining part 19 in the shape of
The metal plate 9 is integrally provided by burring. The outer diameter D2 of the guide part 10 is about ₂ mm. Further, annular step portions 30 and 35 are provided on the outer peripheral portion and the inner peripheral portion between the guide portion 10 and the retaining portion 19, and the wall thickness t ₂ of the retaining portion 19 is guided by these step portions 30 and 35. The thickness is smaller than the wall thickness t ₁ of the portion 10, and is formed, for example, about half. Further, the height from the metal plate 9 to the step portion 30, that is, the height of the guide portion 10
H ₁ is formed to be higher than the thickness H ₃ of the sliding component 3 inserted therein. Further, an annular concave portion 31 is provided in the metal plate 9 around the outer periphery of the base end of the guide portion 10. Then, the sliding component 3 is inserted into the guide portion 10 through the guided hole 6 provided therein, and is slidably mounted on the metal plate 9.

Next, as shown in FIG. 2B, only the retaining portion 19 is bent upward by the bending process above the sliding component 3 in the direction of arrow e to prevent the sliding component 3 from coming off the guide portion 10. Done. When the retaining portion 19 is bent, a gap 32 having a height w is provided between the retaining portion 19 and the sliding component 3.

According to the guide portion 10 and the retaining portion 19 configured as described above, the guide portion 10 for guiding the sliding component 3 and the retaining portion 19 for preventing the component 3 from coming off are the metal plate 9 and the retaining portion 19.
Since it is integrally provided by burring processing on the
A guide shaft, a washer, etc., which are separate parts for the metal plate 9, are completely unnecessary. Then, step portions 30 and 35 are provided on the outer peripheral portion and the inner peripheral portion between the guide portion 10 and the retaining portion 19, and the wall thickness t ₂ of the retaining portion 19 is formed thinner than the wall thickness t ₁ of the guide portion 10. Since only the retaining portion 19 is bent outward, the bending force is not transmitted to the guide portion 10 during the bending. Therefore, changes in the outer diameter D ₂ and the verticality of the guide portion 10 are prevented, so that a highly precise guide portion 10 is obtained, and the guide portion 10 guides the sliding component 3 with extremely high precision.

In addition, the height H ₁ from the metal plate 9 to the step 30 is the sliding component 3
Since it is formed to have a thickness higher than the thickness H _{3 of} the sliding component 3, the guided hole 6 of the sliding component 3 contacts only the guide portion 10.
Further, since the gap 32 having the height w is provided between the retaining portion 19 and the sliding component 3, the sliding component 3 does not contact the retaining portion 19. Therefore, the sliding component 3 is guided with extremely high precision and smoothness. Furthermore, since the annular recess 31 of the metal plate 9 is provided around the outer periphery of the base end of the lower guide portion 10, even if there is a burr on the lower edge of the guided hole 6 of the sliding component 3, this burr is recessed 31 Can escape by
Smooth sliding of the sliding component 3 is guaranteed.

Next, a processing method for forming the guide portion 10 and the retaining portion 19 described above on the metal plate 9 will be described.

First, as shown in FIG. 1A, the first burring process is performed by the first press machine 51. That is, the metal plate 9 is sandwiched by the dies 52 and 53 of the first press machine 51, the punch 54 is pushed up, and the cylindrical tube having a height H ₄ , an outer diameter D ₃ , and a wall thickness t ₂ is formed. The part 56 is formed vertically on the metal plate 9. Here, the height H ₄ of the tubular portion 56 is formed higher than the height H ₂ .

Next, as shown in FIG. 1B, the second pressing machine 60 performs the second burring process. Second press 60
The die 61 is provided with an annular slope portion 64 on the inner peripheral portion thereof, and an annular convex portion 65 is provided on the lower end portion thereof. Further, an annular slope portion 66 is provided on the outer peripheral portion of the punch 63 of the second press machine 60. Then, a second burring process is performed by the dies 61, 62 and the punch 63, and the metal plate 9 and the tubular portion 56 are molded again. By this molding, a cylindrical guide portion having an outer diameter D ₂ that vertically projects on the metal plate 9 at a height H ₁
10 and a cylindrical retaining portion 19 having a height H ₄ continuous with the tip of the guide portion 10 are integrally formed. Then, the slanted surface portion 64 of the die 61 and the slanted surface portion 66 of the punch 63 form annular slanted surfaces 67 and 68 at the outer peripheral portion and the inner peripheral portion between the guide portion 10 and the retaining portion 19. The slopes 67 and 68 make the wall thickness t ₁ of the guide portion 10 thicker than the wall thickness t ₂ of the retaining portion 19. Further, when the second burring process is performed, the annular concave portion 31 is simultaneously formed in the metal plate 9 by the convex portion 65 of the die 61 around the outer periphery of the base end of the guide portion 10.

Thus, by performing the second burring after the first burring guide portion even 10 if the outer diameter D ₂ is smaller, its wall thickness than the thickness t ₁ of the guide portion 10 t ₂ The retaining portion 19 can be obtained with extremely high accuracy. In this embodiment, the tubular portion 56 having the height H ₄ formed by the first burring process is formed in the retaining portion 19 having the same height H ₄ by the second burring process.

Next, as shown in FIG. 1C, compression processing is performed by the third pressing machine 70. An annular step portion 74 is provided in the upper portion of the inner periphery of the die 71 of the third press 70, and an annular step portion 75 is provided in the central portion of the inner periphery. Further, the punch 73 of the third pressing machine 70 is provided with an annular stepped portion 76 and an annular arcuate surface portion 77 continuous therebelow. And die 7
Compression processing is performed by the 1, 72 and the punch 73. That is, the tip of the retaining portion 19 is pressed by the stepped portion 74 of the die 71, and the height of the retaining portion 19 is compressed to H ₂ . Also die 71
By the stepped portion 75 and the stepped portion 76 of the punch 73, the slopes 67 and 68 between the guide portion 10 and the retaining portion 19 are molded into substantially rectangular annular stepped portions 30 and 35, respectively. Further punch 73
The inner peripheral portion of the cylindrical portion 10 is molded by the circular arc surface portion 77. As a result of such compression processing, the guide portion 10 and the retaining portion 19
The outer peripheral portion and the inner peripheral portion of and are reliably adjusted and molded, and the wall thicknesses t ₁ and t _{2 of the} guide portion 10 and the retaining portion 19 are formed.
Is issued with high precision.

Next, as shown in FIGS. 1D and 1E, bending work is performed by the fourth press machine 80. The punch 83 attached to the die 81 of the fourth press 80 has a central protrusion 86 at the lower end.
Is provided, and an annular bending portion 87 formed of a gentle arcuate recess is provided on the outer periphery of the base end of the central projection 86. Further, a stopper 84 is provided on the outer periphery of the punch 83, and the stopper 84 is urged downward by a compression coil spring 85. The stopper 84 is configured so that its height position with respect to the punch 83 can be adjusted in the state shown in FIG. 1E.

Then, as shown in FIG. 1D, after the sliding component 3 is inserted into the guide portion 10 by the guided hole 6 and mounted on the metal plate 9, the central protruding portion 86 of the punch 83 is placed inside the retaining portion 19. Is inserted. At this time, the sliding component 3 is reliably pressed against the metal plate 9 by the stopper 84. Then, as shown in FIG. 1E, the punch 83 is lowered and its bent portion 87
As a result, only the retaining portion 19 is bent outward in the direction of arrow e above the sliding component 3. At this time, the die 81 is brought into contact with the stopper 84 to stop the punch 83 from descending, whereby the height w between the sliding component 3 and the retaining portion 19 is stopped.
A gap 32 is formed. Therefore, the height H of the sliding component 3
_{Even if 3} (that is, the plate thickness) changes, the sliding part 3 and the stopper 1
A constant gap 32 is always secured between 9 and 9.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various effective changes can be made based on the technical idea of the present invention.

The present invention is not limited to the method of processing a chassis in a tape recorder, but can be applied to various metal plate processing methods in which sliding parts or rotating parts are attached.

[Advantages of the Invention] According to the present invention, a tubular portion is formed on a metal plate, and then the metal plate and the tubular portion are formed to form a guide portion and a retaining portion having a thinner wall thickness. Therefore, it is necessary to mold the guide part that guides the part and the thin-walled retaining part that prevents the part from coming off with extremely high precision, especially when the outer diameter of the guide part is small. Therefore, the productivity can be significantly improved.

Moreover, according to the present invention, since the bending force is not transmitted to the guide portion when the retaining portion is bent, it is possible to prevent changes in the outer diameter and verticality of the guide portion. Therefore, the components can be mounted with extremely high precision, and for example, the reduction in size and thickness of a tape recorder or the like can be greatly promoted.

[Brief description of drawings]

The drawings show an embodiment in which the present invention is applied to a method for processing a chassis in a tape recorder. FIG. 1A is a vertical sectional view for explaining the first burring processing, and FIG. 1B is a second sectional view.
Fig. 1C is a vertical cross-sectional view for explaining compression processing, Fig. 1D and 1E are vertical cross-sectional views for explaining bending work, and Fig. 2A is for inserting parts into the guide part. 2B is a vertical cross-sectional view of the tape recorder in a bent state, and FIG. 3B is a perspective view of a main part of the tape recorder showing a usage example of component attachment. In the reference numerals used in the drawings, 3,4,5 …… Sliding parts 6,7,8,17 …… Guided hole 9 …… Metal plate 10,11,12,18 …… Guide part 16 …… Rotation Parts 19,20,21,22 …… Prevention part 30,35 …… Step part 31 …… Concave part 51 …… First press machine 54 …… Punch 56 …… Cylindrical part 60 …… Second press machine 63 …… Punch 70 …… The third press machine 73 …… Punch 80 …… The fourth press machine 83 …… Punch 87 …… Bending part.

Claims (3)

(57) [Claims] 1. A metal member comprising a guide part for slidably or rotatably guiding a sliding part or a rotating part, and a retaining part continuously provided at the tip of the guide part for preventing the part from coming off. In a method for processing a metal plate integrally formed with a plate, a cylindrical portion protruding above the metal plate is formed by a first burring process, and then the metal plate and the cylindrical portion are formed by a second burring process. Molded to form a guide portion and a retaining portion having a thickness smaller than that of the guide portion, and the component was inserted into the guide portion through a guided hole provided therein and mounted on the metal plate. After that, the method for processing a metal plate is characterized in that only the retaining portion is bent outward above the component by bending. 2. The outer peripheral portion and the inner peripheral portion of the guide portion and the retaining portion are formed by compressing the tip of the retaining portion between the second burring process and the bending process. The method according to claim 1, characterized in that 3. The method according to claim 1, wherein when the second burring process is performed, a recess is formed in the metal plate at the same time around the outer periphery of the base end of the guide part. The method described.