JP3098462B2 - Method of forming a circumferential projection on the outer peripheral surface of a pipe material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bulge a circumferential projection at an arbitrary requiring part on the outer circumferential face of a metal tube. SOLUTION: This method is composed of the process where 1st dies 11 (11a, 11b) and 2nd dies 13 (13a, 13b) corresponding to the shape of circumferential face of a metal tube 1 are closely attached or brought into close contact with the total circumferential face of the metal tube 1 so as to insert the requiring part, and the process where an end edge or both end edges of the metal tube 1 are pressed in the longitudinal direction, and in the the process of pressing the metal tube, the dies 13 positioned on the pressing side are moved to the pressing direction in the state of closely attaching on the circumferential face of the metal tube 1 or being brought into close contact with the above, and the circumferential face positioned between the 1st dies 11 and the 2nd dies 13 is bulged with projecting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for forming a circumferential projection on the outer peripheral surface of a pipe, and more particularly to a method for manufacturing a cross member used for a can rack in a so-called vending machine. It is. However, the present invention is not only applied to the manufacture of the horizontal member of the can rack, but is widely applied to all members that form a circumferential convex portion at a desired portion on the outer peripheral surface of the tube material.

[0002]

2. Description of the Related Art A can rack in a so-called vending machine has a plurality of cross members arranged at predetermined positions between flat plates facing each other at a predetermined interval. a)
As shown in (1), it consists of a shaft a and a pipe b externally fitted to the shaft a, and the left and right ends of the shaft a are pierced through a flat plate c and mounted using a washer d. However, since the conventional cross member is composed of a plurality of members as described above, the unit price is high, and it is troublesome to assemble, and these influence the manufacturing cost of the can rack. Therefore, it has been eager to reduce the manufacturing cost of the tube rack.

In order to improve the workability of the can rack and reduce the manufacturing cost, it is preferable to form the cross member as a single member, and the cross member is provided with convex portions in the circumferential direction near the left and right ends. It was proposed to form . However, it is considered that it is impossible to form the convex portion integrally with the cylindrical long member, and such a cross member has not been actually manufactured due to processing problems. . In addition, there are many requests to form a circumferential projection on the outer peripheral surface of the tubular member, not limited to the horizontal member of the can rack, but similarly, such processing has not been performed due to processing problems.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to meet such a demand, and has as its main object to form a circumferentially convex portion at any desired portion on the outer peripheral surface of a tube. Is what you do.

[0005]

Means for Solving the Problems In order to solve the above problems, the technical means adopted by the present invention is to sandwich a first mold member and a second mold member corresponding to the peripheral surface shape of a pipe member except for the desired portion. A step of pressing one end or both ends of the edge of the tube in the longitudinal direction, and a step of pressing the tube in the step of pressing the tube in the longitudinal direction. Characterized in that it is moved in the pressing direction in a state in which it is in close contact with the peripheral surface, and the peripheral surface is formed so as to project between the first mold member and the second mold member. . Further, the apparatus adopted by the present invention has a first mold member and a second mold member having a concave surface corresponding to the shape of the outer peripheral surface of the tube material, and the first mold member and the second mold member have a concave shape of the mold member between both mold members. The first mold member and the second mold member can be moved in the length direction of the tube in a state in which the first mold member and the second mold member are in close contact with the tube member, the surface being configured to be in close contact with the outer peripheral surface of the tube member so as to form a portion where the surface does not adhere. Means for pressing at least one end of the tube material in the length direction, and means for moving a mold material located on the pressing side in the pressing direction with the pressing of the tube material. . The mold located on the pressing side is composed of two members having a semi-cylindrical concave surface, and is configured so that the semi-cylindrical concave surfaces are opposed to each other and closely or closely contact with the peripheral surface of the tube material. The two members are movable in the longitudinal direction of the tube in a state in which the two members are in close or close contact with the peripheral surface of the tube. In addition, a flat substrate
Punching leaving a facing edge to form a long plate
Then, by pressing the long plate material to form a tube material
And both ends in the longitudinal direction of the elongated plate have openings.
The tubular member connected to the edge of the substrate through a connecting piece
The connecting piece opens in response to the change in the length of the tube when compressed.
It is configured to extend through the mouth. By employing such a method and apparatus, it is possible to effectively apply the pressing force from the end of the tube material and to project a desired portion on the outer periphery of the tube material.

[0006] The number of the first mold material and the second mold material is not limited.
In short, it is sufficient that both mold members are brought into close contact with the outer peripheral surface of the tube material with the desired portion interposed therebetween, and that a force applied in the length direction from the end portion of the tube material acts on the desired portion. When a force is applied only from one end of the tube, for example, a stopper may be provided on the other end to restrict the movement of the tube due to pressing from one end. When a force is applied from both sides, it is not necessary to provide a stopper if an equal force is applied simultaneously.

[0007] Preferably, at least one of the opposed end surfaces of the first mold member and the second mold member (of course, both may be provided), a circular concave portion is formed along the periphery of the concave surface. A gap is formed between the pipe and the
The outer peripheral surface of the tube material is formed so as to protrude along the concave portion. This makes it possible to stabilize the size of the projection.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The configuration of the present invention will be described for a case where the present invention is applied to the manufacture of a tubular member used as a cross member of a can rack of a vending machine as a preferred embodiment. First, the configuration of the tubular member 1 manufactured by the manufacturing method according to the present invention will be described. The tubular member 1 is composed of a cylindrical main body 1a having a predetermined length. Protrusions 2 and 2 projecting in the circumferential direction are formed so as to protrude except for the end 1b. Are formed.

As shown in FIG. 1 (b), the interval between the convex portions 2, 2 provided on the tubular member 1 corresponds to the interval between the opposed flat plates c constituting the can rack, and a plurality of Positioning can be performed only by inserting the extra ends 1b at both ends of the tubular member 1 into the perforations of the flat plate c provided with the perforations and bringing the flat plate c into contact with the projections 2. Then, the tubular member 1 is mounted on the flat plate c by folding the tongue-shaped pieces 3 and 3 back and caulking. The shape and number of the tongue pieces 3 are not particularly limited.
What is necessary is just to be able to attach a tubular member to a flat plate by providing a plurality at the end and folding it back.

A method for manufacturing such a tubular member 1 will be described. First, a long metal flat plate 4 is prepared, and a plurality of tongue-shaped pieces 3 are formed by cutting the short sides at both ends in the length direction into a plurality of inverted trapezoidal shapes (FIG. 3). A cylindrical tube is formed from the flat plate 4.

Means for forming a cylindrical tube from the flat plate 4 is known. As shown in FIG. 4, first, the edge 4a on the long side of the flat plate 4 is slightly bent using a mold 5 having a dish-shaped recess and a mold 6 having a wide flat surface. Next, the flat plate 4 is bent into a substantially U shape using the U-shaped mold 7 and the mold 8 having a narrow flat surface portion. Finally, a flat plate 4 formed in a U-shape from above and below by dies 9, 10 having semi-cylindrical concave portions.
, And a cylinder is formed.

Next, an apparatus for forming a projection projecting in the circumferential direction on the outer peripheral surface near both ends of the tubular member 1 will be described with reference to FIG. 5. The apparatus comprises a first mold member 11 and a second mold member 13. And means for pressing the end of the tubular member in the longitudinal direction. The first mold member 11 has a concave surface 12 corresponding to the outer peripheral shape of the tubular member 1, and the concave surface 12 is in close contact with the entire peripheral surface of the tubular member 1 except for an extra end 1 b on at least one end side of the tubular member 1. It is configured as follows.

In a preferred embodiment, the first mold 11
Are semi-cylindrical concave surfaces 12a, 12
The upper mold 11a and the lower mold 11b having the upper surface b are arranged so that the concave surfaces 12a and 12b are opposed to each other, and are closely attached to the peripheral surface of the tubular member 1 from above and below. The upper mold 11a and the lower mold 11b have a dimension smaller than the length of the tubular material by a predetermined dimension. When the upper mold 11a and the lower mold 11b are in close contact with the tubular member 1, extra ends 1b are provided at both ends of the tubular member 1. At both ends of the upper mold 11a and the lower mold 11b, a semicircular notch is formed around the concave faces 12a and 12b by cutting the end face 11c, and the upper mold 11a and the lower mold 11b are formed. When the is in close contact with the tubular member 1 from above and below, a circular concave portion 12c is formed around the tubular member 1.

The second mold member 13 has a concave surface 14 corresponding to the outer peripheral shape of the tubular member 1, and the concave surface 14 is in close contact with the peripheral surface of the extra end 1b at a desired distance from the first mold member 11. In addition, it is configured to be movable in the length direction of the tubular member 1. The second mold member 13 has semi-cylindrical concave surfaces 14a, 14b.
The left and right dies 13a and 13b are block-shaped bodies having concave surfaces 14a and 14b opposed to each other so as to be closely attached to the peripheral surface of the extra end 1b of the tubular member 1 from the left and right directions. At this time, the first mold 1 of the left mold 13a and the right mold 13b
The surface 13c facing the end surface 11c of the first tubular member 1 has a predetermined distance from the end surface 11c of the first mold member.
Is adhered to the outer peripheral surface of the extra end portion 1b. Then, the second mold member 13 moves in the longitudinal direction of the tubular member in a state of being in close contact with the extra end 1b of the tubular member 1.

The edge of the tubular member 1 is pressed through an inner pin 15. The tip of the inner pin 15 has a diameter slightly smaller than the inner diameter of the tubular member 1, and comes into contact with the inner peripheral surface of the end of the tubular member 1. A first step portion 15a having a shape corresponding to the edge shape of the tubular member 1 is formed on the base end side of a predetermined dimension from the distal end portion, and the distal end of the inner pin 15 is inserted into the end portion of the tubular member 1. When this is done, the first step 15a comes into contact with the edge of the tubular member 1. In the embodiment,
Since the plurality of tongue-shaped members 3 are formed at the end edge of the tubular member 1, the first step portion 15 a is formed in a shape that comes into contact with the tongue-shaped member 3. When the edge of the tubular member is a ring-shaped flat surface, the first step portion may simply be formed to have a large diameter.
The second step 15b is formed by forming the base end side larger in diameter than the first step 15a, and when the tip of the inner pin 15 is brought into contact with the edge of the tubular member 1, the second step 15b Two steps 1
5b comes into contact with the end face 13d of the second mold member 13.

Two pressing pins 16 are provided in parallel with the inner pin 15, and the pressing pin 16 is
And the movable member is configured to be movable in the direction of compressing the tubular member 1.
d. Press pin 16
The inner pin 15 is moved by the same pressing cam, and compresses the tubular member 1 while moving the second mold member 13 in the longitudinal direction.
A spring 17 is provided on the end face 13c side of the second mold member 13, and when the pressing by the pressing cam is released, the spring 17 returns the second mold member 13 to the original position.

A method of forming convex portions projecting in the circumferential direction on the outer peripheral surface near both ends of a cylindrical tube will be described.
First, the first mold member 11 is brought into close contact with the peripheral surface of the tubular member 1 while leaving the extra ends 1b at both ends of the tubular member 1. The subsequent steps will be described with reference to FIG. 6. First, the tip of the inner pin 15 is inserted into the end of the tubular member 1 (FIG. 6A). At this time, the first step 15 of the inner pin 15
a contacts the edge of the tubular member 1. Next, the second mold 13
The left mold 13a and the right mold 13b, which constitute the above, are brought into close contact with the peripheral surface of the extra end 1b of the tubular member 1 from both sides at a predetermined interval from the end face 11c of the first mold member 11 (FIG. 6B). Next, the second step portion 15b of the inner pin 15 and the tip of the pressing pin 16 are brought into contact with the end surfaces 13d of the left mold 13a and the right mold 13b (FIG. 6C). Then, the inner pin 15 and the pressing pin 16 are pressed by a pressing cam (not shown) (FIG. 6D). While compressing the tubular member 1, the left mold 13a,
When the right mold 13b is moved until the end face 13c comes into contact with the end face 11c of the upper mold 11a and the lower mold 11b constituting the first mold material 11, the right mold 13b moves along the circular concave portion 12c formed on the end face 11c of the first mold material 11. A projection is formed.

The shapes and configurations of the first mold member 11 and the second mold member 13 are not limited to those in the embodiment, but have a peripheral surface of a shape closely contacting the outer peripheral surface of the tubular member 1 and further have a second The shape member 13 only needs to be movable in the longitudinal direction of the tubular member 1. Upper die 11 in the embodiment
The moving means of the lower mold 11a, the left mold 13a, and the right mold 13b are not particularly limited, and may be performed by a known means using a cam, for example. The pressing means is not limited to the one in the embodiment, but may be any as long as it presses the end of the tubular member 1 while simultaneously moving the second mold member 13. Further, in the embodiment, the circular concave portion 12c is provided on the end surface 11c of the first mold member 11, but the circular concave portion may be provided on the end surface of the second mold member 13, or the circular concave portion may not be provided. Is also good. However, it is desirable to provide a circular concave portion on at least one of the end faces, because a convex portion having a predetermined dimension can be satisfactorily formed.

Such a long metal plate 4 is formed, for example, by punching a substrate 18. As shown in FIG. 7 (a), the plate-shaped substrate 18 is punched out leaving the opposing edge 18a to form the long plate material 4, and both ends of the long plate material 4 in the length direction are openings 18b. Is connected to the edge 18a of the substrate 18 via the connecting piece 18c having Then, the tubular member 1 is formed from the long plate material 4 by the method shown in FIGS. 4 and 6, and the length of the tubular material when the tubular member 1 is compressed by providing the opening 18b in the connecting piece 18c. The connecting piece 18c extends through the opening 18b in response to the change. Then, the tubular member 1 can be obtained by cutting the formed tubular member 1 from the substrate 18. In addition, it is preferable to provide an anti-pulling member 19 between the connecting piece 18c and the edge 18a of the substrate 18.

As described above, the method and the apparatus for projecting the convex portion near the end of the tubular material have been described. However, the present invention is not limited to this, and as shown in FIG. The protruding portion 2 can be formed so as to protrude at any desired position of the first intermediate portion. FIG. 8A shows one molding 11.
′ Is fixed, the other mold member 13 ′ is movable, and the tubular member 1 is pressed from one end side. FIG. 8B
Is such that both mold members 11 ″ and 13 ′ are movable and press the tubular member 1 from both ends.

[0021]

As described above, according to the present invention, the mold material closely or closely contacting the peripheral surface of the tube material opposes the force for deforming the tube material and concentrates the pressing force on a desired portion where a convex portion is desired to be formed. As a result, the convex portion can be formed on an arbitrary peripheral surface of the tubular member by a simple means. Moreover, by providing an opening in the connecting piece,
Connecting piece corresponding to the change in the length of the tube when the tubular member is compressed
Extend through the opening,
The tubular member is obtained by cutting the tubular member from the substrate.
Can be

[Brief description of the drawings]

FIG. 1A is a schematic view showing a configuration of a cross member of a conventional can rack. (B) is a schematic diagram showing a mounting means of the cross member manufactured by the present invention.

FIG. 2 is a schematic view of a tubular member manufactured according to the present invention.

FIG. 3 is a view showing a flat plate used for forming a tubular member.

FIG. 4 is a diagram illustrating a method of forming a tube from a flat plate.

FIG. 5 shows an apparatus for projecting and forming a convex portion on a tube material;
(A) is an overall schematic plan view, (b) is a diagram showing a first mold member, a left side shows a cross section, (c) is a diagram showing a second mold member, and (d) is an end portion of a tube material. FIG. 6 is a view showing an inner pin for pressing the inner pin.

FIG. 6 is a view showing a step of projecting and forming a convex portion on a tube material.

FIG. 7 is a schematic view showing a means for correcting the compression of the length of the tube material.

FIG. 8 is a schematic cross-sectional view showing a means for forming a convex portion at an intermediate portion of a pipe member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tubular member 1b Extra end 2 Convex part 11 1st mold 11a Upper mold 11b Lower mold 12, 14 Concave surface 12c Circular recess 13 Second mold 13a Left mold 13b Right mold 15 Inner pin

Claims (1)

(57) [Claims] 1. A method comprising: (a) forming a projection in a circumferential direction at a desired portion of a peripheral shape of a tube material formed by bending a flat plate; and (b) opposing a flat substrate. Punch out leaving the edges
Along with forming a long plate, the longitudinal direction of the long plate
Both ends are connected to the edge of the substrate via a connecting piece having an opening.
The tube is formed by connecting and pressing the long plate.
A step of forming, the first die member and the second die member corresponding to the peripheral shape of (c) the tube member, a step of adhering or closely throughout the circumferential surface of the manner tubing sandwich except the desired site, (d) And (e) the mold located on the side to be pressed in the mold comprises two members having a semi-cylindrical concave surface. It is configured such that the concave surfaces are opposed to each other so as to be in close contact or close contact with the peripheral surface of the tube, and in the step of pressing the edge of the tube, the two members are pressed in a state in which the two members are in close contact or close contact with the peripheral surface of the tube. In a direction between the first mold member and the second mold member so as to protrude the peripheral surface thereof , and
The connecting piece responds to the change in length of the tube when the material is compressed.
A method for projecting a circumferential projection on an outer peripheral surface of a tube material, wherein the projection is formed so as to extend through an opening .