JP2685585B2 - Method of fixing plate material in tubular body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a method of fixing a plate member in a cylindrical body for fixing a plate member to the inner periphery of the cylindrical body to form a bottom plate or a partition plate. Regarding

(Prior Art) For example, when forming an air cylinder using a pipe material, it is necessary to fix a partition plate in the pipe material.
As a method of fixing the plate member to such a pipe member, there is a conventional technique shown in FIGS. 7 and 8 (A) and (B).

In the plate material fixing method shown in FIG. 7, a large-diameter portion 2 is formed on the inner circumference from the end of the pipe material 1 to a predetermined position, and a disc-shaped plate material 3 is inserted into the large-diameter portion 2 to insert a sir. After being prevented from coming off by the clip 4, the outer peripheral surface of the pipe material 1 is drawn by a drawing die 5, and the outer peripheral surface of the plate material 3 is pressed against the inner peripheral surface of the pipe material 1 to be fixed.

Further, the fixing method of the plate material shown in FIGS. 8 (A) and (B) is as follows.
A circumferential groove 6 is formed at a predetermined position on the inner circumference of the pipe material 1,
The plate material 3 is inserted into a position corresponding to the circumferential groove 6 and supported by the pedestal 7. Then, the peripheral portion of the plate material 3 is pressed by the punch 8 to extrude the meat in the peripheral portion of the plate material 3 to the outside. The extruded portion 3a is allowed to enter the circumferential groove 6 so that the plate material 3 is inserted into the pipe material 1
Is to be fixed.

(Problems to be Solved by the Invention) However, among the above-mentioned conventional techniques, the drawing process shown in FIG. 7 can be relatively easily performed if the pipe material 1 is cylindrical, but as shown in FIG. In the case where the head 9 forming the end portion of the cylinder has a hot-extruded irregular shape, the drawing process cannot be applied. Further, in the case of drawing, there is a surface that is difficult to process depending on the material of the pipe material 1, and at the same time, if the thickness of the plate material 3 is small, the plate material will bend due to drawing, and it will be difficult to obtain sufficient fixing strength. There is a problem that a plate material having an unnecessary thickness must be used.

On the other hand, in the press-out fixing method using the punch 8 shown in FIGS. 8 (A) and 8 (B), the press-out portion 3a of the plate member 3 simply enters the circumferential groove 6 and therefore does not serve as a stopper. However, the sealing property cannot be expected, and when it is applied to a cylinder, it is likely to cause gas leakage or liquid leakage. Particularly, the groove mark 3b by the punch 8 is formed in a ring shape in the peripheral portion of the plate material 3, and this portion However, there is a problem in that the plate thickness is significantly reduced, which is disadvantageous in terms of strength, and there is a constraint that a plate material having a thickness equal to or larger than a predetermined dimension must be used.

In view of this, the present invention is capable of fixing a plate member on the inner periphery of a cylindrical body having an outer shape to which drawing processing cannot be applied, and is a simple facility regardless of the plate thickness or material. The object of the present invention is to provide a plate material fixing method in a tubular body that can be carried out by.

[Configuration of the invention]

(Means and Actions for Solving the Problem) As a means for solving the problems of the above-described conventional technique, the present invention forms a plate material to be fixed to the inner circumference of the tubular body in advance to a diameter larger than the inner diameter of the tubular body. At the same time, the plate is bulged and deformed into a spherical surface having a predetermined radius and pre-processed so that its outer diameter can be fitted to the inner circumference of the tubular body. Insert it into the concave surface and abut the pedestal,
It is characterized in that by pressing the convex curved surface side, it is expanded in a flat shape and the outer cylinder of the plate material is pressed and fixed to the inner peripheral surface of the cylindrical body.

Hereinafter, the present invention will be described with reference to examples shown in the drawings.

The plate member 11 to be fixed to the inner periphery of the tubular body 10 is shown in FIG.
As shown in FIG. 3 (B), the outer diameter D ′ of the cylindrical body 10 is slightly larger than the inner diameter d of the cylindrical body 10, and the outer diameter D ′ of the cylindrical body 10 is bulged and deformed into a spherical surface having a predetermined radius. Is a tubular body
Preformed to a size slightly smaller than the inner diameter d of 10. In this forming, when the plate material 11 is punched into a predetermined shape by a press machine, it can be pressed into a spherical shape at the same time, and can be obtained in one step.

The plate material 11 thus formed is inserted into the plate material fixing position in the tubular body 10 as shown in FIG. 1, the concave surface side of the plate material 11 is supported by the pedestal 12, and then the convex curved surface side is pressed or the like. The pressure is applied by the pressure means 13 of. As a result, the plate material 11 is extended in a flat shape, and the outer peripheral surface of the plate material 11 is pressed against the inner peripheral surface of the tubular body 10 and crimped as shown in FIG. In this case, knurling 14 as shown in FIG. 5 (A), groove processing 15 as shown in FIG. 5 (B), and thread groove processing 16 as shown in FIG. If this is done, caulking can be done more reliably.

When the tubular body 10 is a soft material or a thin pipe material when the plate material 11 is pressure-extended and there is a risk that the diameter is expanded outward, it corresponds to the plate material fixing position as shown in FIG. The pressing member 17 may be surrounded by the outer periphery of the tubular body 10 so as to prevent the tubular body 10 from being expanded and deformed. Further, when the tubular body 10 is a hard material, it is preferable that a peripheral groove be formed in the inner periphery of the position where the plate material 11 is fixed and the peripheral edge of the plate material 11 be press-fitted into the peripheral groove. Further, in order to prevent gas or liquid leakage, it is also possible to intervene a pre-sealing material between the outer peripheral surface of the plate material 11 and the inner peripheral surface of the tubular body 10 and crimp it. The tubular body 10 is not limited to the one having a cylindrical inner peripheral surface, and may be a polygonal body or a polygonal body. In addition, the plate material 11 is not limited to a blind plate, and can be fixed in the same manner even in the case of an annular shape.

〔The invention's effect〕

As described above, according to the present invention, the plate material is preliminarily bulged and deformed into a spherical shape, and then pressure-extended at the time of fixing to fix the outer periphery thereof to the inner peripheral surface of the cylindrical body by press-contacting. Even if the thickness is thin, it can be sufficiently fixed, and once it is bulged, deformed, given tensile stress, and then compressed again by extending it, these increase the processing hardness and the tensile strength is 50% or more. Even if the plate material becomes large and thin, it can be a strong partition plate or bottom plate without deforming the plate material. In addition, it can be applied to a cylindrical body with an external shape that conventional drawing cannot be applied, and the fixing process can be performed only by the pressurizing device, so the equipment is simpler than the drawing device. It has various effects such as low cost production.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the steps of the present invention, FIG. 2 is a cross-sectional view at the time of completion thereof, FIG. 3 (A) is at the time of punching of a plate material, and FIG. 3 (B) is a cross-sectional view after bulging preliminary processing, FIG. 4 is a cross-sectional view showing another embodiment, FIGS. 5 (A) to (C) are partial front views showing an example of forming a retaining groove on the outer peripheral surface of a plate material, and FIG. FIG. 7 and FIGS. 8A and 8B are sectional views showing a conventional fixing method, showing a partial perspective view showing an example of a tubular body as an application target. 10 …… Cylindrical body, 3,11 …… Plate material, 7,12 …… Receptor, 13 …… Pressure means, 17 …… Pressing member.

Claims (1)

(57) [Claims] 1. A plate material to be fixed to the inner circumference of a tubular body is formed in advance to have a diameter larger than the inner diameter of the tubular body, and is bulged and deformed to a spherical surface having a predetermined radius toward one side thereof. Preliminarily process the outer diameter to a size that allows it to fit into the inner circumference of the tubular body, insert this plate into the inner circumference of the tubular body at a predetermined position, and contact the pedestal with the concave curved surface side, A plate material fixing method in a tubular body, which comprises flattening the plate material by pressurizing and fixing the outer periphery of the plate material to the inner peripheral surface of the tubular body by pressing.