JP2014091856A - Method for manufacturing bottom-closed cylindrical body and bottom-closed cylindrical body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately form a bottom-closed cylindrical body to have a thin bottom part while maintaining high rigidity of a side part.SOLUTION: A tubular pipe member 1 is used as a component for a side part of a bottom-closed cylindrical body, and a thin plate-shaped disk 2 is used as a component for a bottom part of the bottom-closed cylindrical body. The disk 2 arranged so as to close a bottom mouth of the pipe member 1 is fixed to the bottom mouth of the pipe member 1 by sucking air in a hollow part of the pipe member 1 by an air pump 500. In a state where the disk 2 is fixed to the pipe member 1 by suction by the air pump 500, the disk 2 and the pipe member 1 are immersed in a plating tank 200 and plated, and the disk 2 is fixed by a plating layer 3 continuously covering the disk 2 and the pipe member 1 so as to form a bottom part of the pipe member 1.

Description

  The present invention relates to a method for manufacturing a bottomed cylindrical body.

  As a manufacturing method of a bottomed cylindrical body having a tube-shaped side portion and a bottom portion that closes one tube-shaped port, the other tube-shaped port is opened. In addition, a technology for cutting a bottomed cylinder from a metal block by forming a hollow part of the bottomed cylinder by performing deep hole machining by cutting or boring by grinding (for example, Patent Documents) 1).

  Moreover, as a manufacturing method of a bottomed cylindrical body, the technique of plastically processing a bottomed cylindrical body from a thin plate by spinning process is also known (for example, patent document 2).

Japanese Unexamined Patent Publication No. 07-328824 Japanese Patent Laid-Open No. 2001-30018

According to the technology for cutting a bottomed cylindrical body from a rod-shaped metal block as described above, a bottomed cylindrical body having high rigidity is manufactured compared to the case of plastically processing a bottomed cylindrical body from a thin plate by plastic processing or the like. On the other hand, there is a problem that it is difficult to form the bottom with a small thickness with high accuracy and to manufacture a bottomed cylindrical body having a small cylindrical outer diameter or a long tubular side.
Then, this invention makes it a subject to provide the manufacturing method of a bottomed cylinder which can form the thickness of a bottom part thinly and with sufficient precision, maintaining the rigidity of a side part highly. In addition, another object of the present invention is to provide a method for manufacturing a bottomed cylinder suitable for manufacturing a bottomed cylinder having a long tube-shaped side portion.

  In order to achieve the above object, the present invention provides a method for manufacturing a bottomed cylindrical body having a tube-shaped side portion and a bottom portion that closes one of the tube-shaped ports. A first step of combining a thin plate member having a thin plate shape with the tube member so as to close the opening, and in a state where the thin plate member is combined with the tube member, the thin plate member and the tube member are used as a plating tank. And a second step of fixing the thin plate member to the tube member by a plating layer.

Here, in the manufacturing method of such a bottomed cylindrical body, the second step is a state where the thin plate member is combined with the tube member, and is opposite to the mouth of the tube member closed by the thin plate member. Sucking air from the mouth and adsorbing the thin plate member to the one mouth of the tube member;
In a state where the thin plate member is adsorbed to the one opening of the tube member, the thin plate member and the tube member are immersed in a plating tank for plating, and the thin plate member is fixed to the tube member by a plating layer. Steps may be included.

In addition, an annular recess that is recessed on the other mouth side is provided on the inner peripheral side of the end portion on the one mouth side of the tube member, and the thin plate member is fitted into the annular recess in the first step. By combining, the thin plate member may be combined with the tube member.
According to the manufacturing method as described above, the rigidity of the tube member can be arbitrarily set, so that the rigidity of the side portion of the bottomed cylindrical body can be set high. On the other hand, the thin plate member can be easily formed to be thin with appropriate accuracy, and can be fixed to the tube member with high accuracy in terms of position and posture with the thin plate member as the bottom of the bottomed cylindrical body. Therefore, according to the manufacturing method of this invention, the bottom part of a bottomed cylinder can be formed thinly and with sufficient precision. In addition, since the manufacturing method of the present invention does not depend greatly on the difficulty of manufacturing a bottomed cylindrical body depending on the length of the pipe member, according to the present invention, the bottomed cylindrical body with a long tubular shape is used. Even if it exists, it can manufacture comparatively easily.

Moreover, this invention also provides the bottomed cylinder manufactured by the above manufacturing methods from another viewpoint.
That is, the present invention provides a tubular member having a tubular shape that forms the side part as a bottomed cylindrical body having a tubular side part and a bottom part that closes one of the tubular shaped mouths, and the bottom part. A bottomed cylinder having a thin plate member having a thin plate shape and a plating layer is provided. However, the plating layer covers at least a portion of the outer surface of the bottomed cylindrical body, which is composed of an outer surface of the side portion on the one mouth side and an outer surface of the thin plate member. The thin plate member is fixed only to the pipe member by the plating layer.

  Here, such a bottomed cylindrical body is suitable as a housing of a magnetic sensor, for example. That is, a magnetic sensor is configured by the above-described bottomed cylindrical body and the magnetic detection element housed in the bottomed cylindrical body in a form disposed in a position close to the bottom portion inside the bottomed cylindrical body. In this case, since the thickness of the bottom of the bottomed cylindrical body can be sufficiently reduced, a good detection sensitivity of the magnetic sensor can be obtained.

  As described above, according to the present invention, it is possible to provide a method for manufacturing a bottomed cylindrical body capable of forming the bottom part thinly and with high accuracy while maintaining the rigidity of the side part high. Moreover, according to this invention, the manufacturing method of a bottomed cylinder suitable for manufacture of a bottomed cylinder with a long tube-shaped side part can be provided.

It is a figure which shows the components structure of the bottomed cylinder which concerns on embodiment of this invention. It is a figure which shows the manufacturing method of the bottomed cylinder which concerns on embodiment of this invention. It is a figure which shows the example of application of the bottomed cylinder which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described.
In FIG. 1, the component structure of the bottomed cylinder which concerns on this embodiment is shown.
The bottomed cylindrical body has a tube-shaped side portion and a bottom portion that closes one of the tube-shaped ports. In the present embodiment, the bottomed cylindrical body is a tube-shaped tube of the bottomed cylindrical body. A tubular tubular member 1 that forms the side portion and a thin plate-like disk 2 that forms the bottom of the bottomed cylindrical body are configured. Here, stainless steel, nickel, or the like can be used as the material of the tube member 1 and the disc 2. Here, the diameter of the tube member 1 can be about 2 cm, the height of the tube member 1 can be about 3 cm, and the thickness of the disk 2 can be 200 μm or less. Note that the diameter of the disc 2 is several mm smaller than the outer diameter of the tube member 1.

Here, FIG. 1 a represents a perspective view of the tube member 1 and the disk 2, and FIG. 1 b represents a cross-section of the tube member 1 by a plane including a line passing through the central axis of the tube member 1 in the plane, The cross section of the disk 2 by the surface which contains the line which passes along the central axis of the board 2 in a surface is represented.
Now, as shown by the code | symbol 11 of FIG. 1b, the inner peripheral side of the lower part of the pipe member 1 is dented upward in the step shape compared with the outer peripheral side, and the annular dent formed by the said dent as shown in FIG. 1c. 11, the disc 2 is just fitted in, and the lower opening of the pipe member 1 is closed.
Hereinafter, the manufacturing process of the bottomed cylinder using such a pipe member 1 and the disc 2 will be described.
When manufacturing a bottomed cylindrical body, first, pre-plating treatment such as degreasing is performed on the tube member 1 and the disc 2 in a first step.
Then, in the second step, as shown in FIG. 2 a, a cap 300 is attached to the upper port of the tube member 1, and the disc 2 is fitted into the annular recess 11 of the tube member 1, so that Close your mouth.
Here, a tube 400 extending to the outside of the pipe member 1 is connected to the cap 300 in a state where the cap 300 is attached to the upper opening of the pipe member 1. The cap 300 is provided with an air passage that communicates the tube 400 and the hollow portion of the tube member 1 in a state where the cap 300 is attached to the upper port of the tube member 1. And by mounting | wearing with the cap 300, the upper opening of the pipe member 1 is sealed except the air path mentioned above. An air pump 500 that sucks air is connected to the end of the tube 400 opposite to the cap 300.

Then, in the third step, the air in the hollow portion of the tube member 1 is sucked by the air pump 500 and the pressure is reduced, and the tube 2 fitted in the annular recess 11 of the tube member 1 is sucked into the tube member 1. Attach and fix.
Next, in the fourth step, as shown in FIG. 2 b, the disc 2 and the pipe member 1 are immersed in the plating tank 200 while the disc 2 is fixed to the pipe member 1 by the pressure reduction by the air pump 500. Then, the disc 2 and the pipe member 1 are plated.
Here, as the plating method used in the fourth step, electrolytic / electroless nickel plating or the like can be used. In the fourth step, for example, a plating layer of about 5 μm is formed on the outer surface of the disk 2 and the tube member 1. Form on top.
Here, as shown in FIG. 2c and FIG. 2d, which is a partially enlarged view of FIG. 2c, the outer surfaces of both the disk 2 and the tube member 1 are continuously formed by plating in the fourth step. A covering plating layer 3 is formed, and the disc 2 is fixed to the tube member 1 relatively firmly by the plating layer 3. Further, the plating infiltrates even in a slight gap in the left-right direction in the drawing between the disc 2 and the tube member 1, and connects the disc 2 and the tube member 1 to fix them.

And by the said fixation, the disc 2 and the pipe member 1 are integrated, and a bottomed cylinder is formed.
Next, in the fifth step, after releasing the pressure reduction by the air pump 500, the cap 300 is removed from the upper mouth of the pipe member 1, and post-plating treatment such as washing of the plated bottomed cylinder is performed, Completed production of bottomed cylinder.
In addition, after a 5th process, a bottomed cylinder may be immersed in the plating tank 200 again, and plating may be given to the inner surface of a bottomed cylinder.
In the above, the manufacturing process of the bottomed cylinder which concerns on this embodiment was demonstrated.
According to the manufacturing method of the bottomed cylindrical body by the manufacturing process of the bottomed cylindrical body as described above, the rigidity of the tube member 1 can be arbitrarily set. Can be set high. On the other hand, the disk 2 can be easily and accurately formed thinly, and can be fixed to the tube member 1 with accuracy in terms of position and posture as the bottom of the bottomed cylindrical body. As a result, the bottom portion of the bottomed cylindrical body can be formed thin and with high accuracy. In addition, since the manufacturing method as described above does not depend greatly on the difficulty of manufacturing the bottomed cylindrical body depending on the length of the tube member, even if the bottomed cylindrical body has a long tubular side portion, It can be manufactured easily.

  Although it is conceivable to fix the disk 2 to the tube member 1 by bonding, since an adhesive is present between the disk 2 and the tube member 1 in this way, the bottom of the disk 2 is prevented. The posture and position cannot be formed with high accuracy, and a problem that sufficient sealing cannot be obtained is likely to occur.

Next, application examples of the bottomed cylindrical body manufactured in this way will be described.
FIG. 3 shows an example in which a bottomed cylindrical body is applied as a magnetic sensor casing of a tachometer using a magnetic sensor.
As shown in FIG. 3 a, the tachometer includes a magnetic sensor 600, a measuring device 610, and a cable 620 that connects the magnetic sensor 600 and the measuring device 610.
Then, as shown in FIG. 3 b, the tachometer is connected to the magnetic sensor 600 and the measuring device 610 with the cable 620, and the teeth of the gear 700 are rotated along with the rotation of the magnetic gear 700 fixed to the measurement target. The magnetic change due to the distance is detected by the magnetic sensor 600, and the rotation speed and the like are measured by the measuring device 610 from the magnetic change detected by the magnetic sensor 600.

  Here, as shown in FIG. 3 a, the magnetic sensor 600 is roughly composed of a main body portion 601, a sensor housing portion 602, and two fixing nuts 603. The sensor housing portion 602 and the main body portion 601 house various elements and circuits for magnetic / electrical signal conversion including a magnetic detection element.

  Although not shown, a male screw is cut on the outer peripheral surface of the sensor housing portion 602, and the two fixing nuts 603 are screwed into the male screw. The two fixing nuts 603 are used to fix the magnetic sensor 600 at a position where the tip of the sensor housing portion 602 is close to the tooth tip of the gear 700 as shown in FIG.

Here, the bottomed cylinder manufactured by the manufacturing process described above is used for the sensor housing portion 602.
FIGS. 3c1 and 3c are perspective views of the sensor housing portion 602, and FIG. 3d shows an internal configuration of the sensor housing portion 602 shown in a cross section by a plane including the central axis of the sensor housing portion 602 in the plane.
As shown in the figure, the sensor housing portion 602 is a bottomed cylinder formed by the tube member 1, the disk 2, and the plating layer 3, and is located near the bottom of the tip portion of the hollow portion of the sensor housing portion 602. Are arranged with a magnetic detection element 6021 such as an MR element for detecting the intensity of a magnetic field acting upon the action of a magnetic field or a change in intensity.

  And according to the bottomed cylinder manufactured with the manufacturing process mentioned above, the bottom part (disc 2) of a bottomed cylinder can be formed sufficiently thinly. Therefore, the magnetic detection element 6021 can be arranged at a position very close to the tip of the magnetic sensor 600, that is, a position closer to the teeth of the gear 700 that is the detection target, and the magnetic detection element by the bottom thickness. The influence of attenuation or the like on the magnetic field acting on 6021 can be reduced. Therefore, it is possible to improve the detection sensitivity of the magnetic field detection sensor and consequently the measurement accuracy such as the rotation speed of the tachometer.

The embodiment of the present invention has been described above.
In addition, although the cylindrical bottomed cylindrical body has been described above, the present embodiment can be similarly applied to a bottomed cylindrical body having an arbitrary shape such as a square cylindrical bottomed cylindrical body.

  DESCRIPTION OF SYMBOLS 1 ... Pipe member, 2 ... Disc, 3 ... Plated layer, 11 ... Step, 200 ... Plating tank, 300 ... Cap, 400 ... Tube, 600 ... Magnetic sensor, 601 ... Main part, 602 ... Sensor accommodating part, 603 ... Fixing nut, 610 ... measuring device, 620 ... cable, 700 ... gear, 6021 ... magnetic detection element.

Claims (6)

A method of manufacturing a bottomed cylinder having a tube-shaped side portion and a bottom portion for closing one of the tube-shaped ports,
A first step of combining a thin plate member having a thin plate shape with the pipe member so as to close one opening of the tube member having a tubular shape;
In a state where the thin plate member is combined with the tube member, the thin plate member and the tube member are immersed in a plating tank to be plated, and the thin plate member is fixed to the tube member by a plating layer; A method for producing a bottomed cylindrical body characterized by comprising:
It is a manufacturing method of the bottomed cylinder according to claim 1,
The second step includes
In a state where the thin plate member is combined with the tube member, air is sucked from the mouth of the tube member opposite to the mouth closed by the thin plate member, and the thin plate member is placed in the one mouth of the tube member. Adsorbing step;
In a state where the thin plate member is adsorbed to the one opening of the tube member, the thin plate member and the tube member are immersed in a plating tank for plating, and the thin plate member is fixed to the tube member by a plating layer. And a step of manufacturing the bottomed cylindrical body.
A method for producing a bottomed cylindrical body according to claim 1 or 2,
On the inner peripheral side of the end portion on the one mouth side of the pipe member, an annular dent recessed on the other mouth side is provided,
In the first step, the thin plate member is combined with the tube member by fitting the thin plate member into the annular recess, and the manufacturing method of the bottomed cylindrical body characterized by the above.
The bottomed cylinder manufactured by the manufacturing method of Claim 1, 2, or 3.
A bottomed cylinder having a tube-shaped side portion and a bottom portion for closing one of the tube-shaped ports;
A tube member having a tube shape forming the side portion;
A thin plate member having a thin plate shape forming the bottom;
A plating layer that at least covers a portion of the outer surface of the bottomed cylindrical body, the outer surface of the side portion of the one mouth side, and the outer surface of the thin plate member;
The bottomed cylindrical body, wherein the thin plate member is fixed to the tube member only by the plating layer.
A bottomed cylindrical body according to claim 4 or 5,
A magnetic sensor comprising: a magnetic detecting element housed in the bottomed cylindrical body in a form disposed at a position close to the bottom inside the bottomed cylindrical body.