JP2000271677A - Method and device for flaring cylinder end part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To flare the opening end part of a cylindrical body even when the end part has roughly an oval shape, to prevent generation of bucking of the cylindrical body with reducing working force, to improve durability and to simplify a set up work in a method and device for flaring the cylindrical body end part used, e.g. for the muffler shell of an automobile. SOLUTION: By pressing an annular protrusion 14 of a roller 8 arranged to the inside of a cylindrical body 1 onto the opening end part 2 of the cylindrical body 1 to the outward direction orthogonal to the axis L0 of the cylindrical body 1, the opening end part 2 is bent on an annular receiving part 12 arranged outside the cylindrical body 1, and the annular protrusion 14 is rolled along the peripheral direction of the opening end part 2.

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 flaring a cylindrical end used for a shell of a muffler of an automobile, for example.

[0002]

2. Description of the Related Art Conventionally, a cylindrical body is used for a shell of a muffler mounted on an exhaust system of an automobile, for example, and an open end of the cylindrical body is flared. The flare processing of the opening end of the cylindrical body will be described with reference to FIG. In the figure, first, as shown in FIG. 8A, a cylindrical body 103 is set between a pair of upper and lower flare punches 101 and 102.

[0003] Next, as shown in FIG. 8 (b), by moving the flare punches 101 and 102 along the axial direction, the opening end portions 103 A and 103 A of the cylindrical body 103 are brought into contact with the flare punches 101 and 102. By being pushed in the axial direction along the shape, it is bent and expanded outward. Thus, the opening end 103A of the cylindrical body 103,
103A is flared.

A pair of upper and lower flare punches 101 and 102
Is applied to the open ends 103A, 103A of the cylindrical body 103 having a substantially elliptical cross section, a perfect circular cross section, or a cross section having a different size.

[0005]

However, in the above-mentioned flare method, the open ends 103A, 103A of the cylindrical body 103 are not provided.
Is pressed in the axial direction along the shape of the flare punches 101 and 102, and the entire circumference is bent at one time. Therefore, the pressing force of the flare punches 101 and 102 increases, and, for example, buckling occurs in the middle portion 103B of the cylindrical body 103. There was a possibility that this would occur.

Further, there has been a problem that the flare punches 101 and 102 have much wear and are inferior in durability. further,
In order to flare the open ends 103A, 103A of the cylindrical body 103 having a substantially elliptical cross section, a perfect circular cross section, or a cross section having a different size, it is necessary to replace the flare punches 101, 102 with other ones. And the setup work was troublesome.

On the other hand, as a method of flaring a pipe end, spinning processing as shown in Japanese Utility Model Laid-Open No. 61-46023 is known as shown in FIG. In the figure, this spinning process fixes the tube 201 with a mold 202,
The end 201A of the tube 201 is fixed to the mold 202 by the roll 203.
To form the end 201A of the tube 201 in accordance with the bent shape of the mold 202.

Although the spinning process can be applied to the cylindrical body at the open end of a perfect circular shape to flare the open end of the cylindrical body, it can be applied to the cylindrical body at the open end of a substantially oval shape. It is difficult to do. The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to allow a flare process to be performed even when an opening end of a cylindrical body has a substantially oval shape, thereby reducing a processing force. It is an object of the present invention to provide a method and an apparatus for flaring a cylindrical body end, which can prevent buckling of the cylindrical body, improve durability, and can easily perform a setup operation.

[0009]

According to the first aspect of the present invention,
By pressing the annular projection of the roller disposed inside the cylinder toward the radially outer side perpendicular to the axis of the cylinder onto the opening end of the cylinder, the opening end is positioned outside the cylinder. The annular projection is rolled along the circumferential direction of the opening end by bending over the ring-shaped receiving portion arranged in the opening.

According to a second aspect of the present invention, in the method for flaring an end of a cylindrical body according to the first aspect, the number of rollers is two, and both rollers are centered on a center point of an open end of the cylindrical body. Are symmetrically arranged. Claim 3
The invention described in the above is for expanding a diameter of an opening end of a cylindrical body, and includes a rotating member, a ring-shaped receiving member fixed to face the rotating member, and inclined at a predetermined angle with respect to the axis of the cylindrical body. A roller having an annular projection disposed inside the ring-shaped receiving portion with an axis parallel to the axis of the cylindrical body and having an annular projection; and an annular projection of the roller provided on the rotating member for supporting the roller. And a roller pressing means for pressing the opening toward the radially outward direction perpendicular to the axis of the cylindrical body onto the opening end.

According to a fourth aspect of the present invention, there is provided the flare processing apparatus for cylindrical end portions according to the third aspect, wherein the number of rollers is two, and both rollers are centered on the center point of the open end of the cylindrical body. Are symmetrically arranged. Claim 5
According to a preferred embodiment of the present invention, in the apparatus for flaring an end of a cylindrical body according to claim 3, the number of rollers is two, and both rollers are arranged symmetrically with respect to a center point of an opening end of the cylindrical body.
The roller pressing means supports a pair of rollers, and a pair of arms respectively provided on the rotating member so as to be rotatable around a base, and a pair of arms provided on the rotating member so as to be rotatable about the base. And a pair of cylinders, each of which has a rod connected to the distal end side of a rod.

(Function) In the first aspect of the present invention,
When rolling the annular projection of the roller along the circumferential direction of the opening end, the annular projection of the roller pushes the opening end of the cylindrical body outward in a direction perpendicular to the axis of the cylindrical body, whereby the opening end of the cylindrical body is pressed. Is bent over a ring-shaped receiving portion arranged outside the cylindrical body.

As a result, the open end of the cylindrical body is pushed outward (ie, flared) over the entire circumference. In the invention according to claim 2, the number of rollers is two.
Since both rollers are arranged symmetrically with respect to the center point of the opening end of the cylindrical body, two portions of the opening end are simultaneously flared by both rollers. When flaring two portions of the opening end where the two rollers are in contact with each other at the same time, pressing force is simultaneously applied to two portions of the opening end of the cylindrical body. The balance of the cylinder is secured by the two pressing forces,
Therefore, the positioning state of the opening end of the cylindrical body is reliably held.

In the third aspect of the present invention, the opening end of the cylindrical body is flared as follows. The tubular body is set inside the ring-shaped receiving portion. In this state, as the rotating member rotates, the roller pressing means provided on the rotating member also rotates, and the roller turns along the circumferential direction of the opening end of the cylindrical body. At this time, the roller pressing means applies a force to the annular protrusion of the roller in a radially outward direction perpendicular to the axis of the cylindrical body. Accordingly, the open end of the cylindrical body is pressed against the ring-shaped receiving portion and received by the annular projection of the roller.

[0015] With the rotation of the rotating member, the roller is rolled along the circumferential direction of the open end, and the open end of the cylindrical body is expanded and flared. According to the fourth aspect of the invention, the same operation as the second aspect of the invention is produced. According to the fifth aspect of the present invention, the roller follows the opening end of the cylindrical body via the arm by the expansion and contraction of the rod of the cylinder. Due to the annular projection of the roller, the open end of the cylindrical body is pressed against the ring-shaped receiving portion.

Further, by moving the roller in the radial direction by the cylinder via the arm, the open end of the cylindrical body is clamped (the open end of the cylindrical body is held between the annular projection of the roller and the ring-shaped receiving part). A state in which the roller is clamped) or an unclamped state (a state in which the roller has escaped inside the cylinder) is selected.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 6 show a method of flaring a cylindrical body end according to the first embodiment of the present invention, and a tube according to the second and third embodiments of the present invention. A flare processing apparatus for a body end will be described. The work to be flared is shown as a cylinder 1 in FIGS. In the figure, the open end 2 of the cylindrical body 1 has a substantially oval cross section, and the open end 2 is indicated by a two-dot chain line 2D in FIG. 6 by flare processing (a state perpendicular to the axis of the cylindrical body 1). )
The case where the diameter is increased will be described as an example. The substantially elliptical shape includes, for example, an ellipse, an ellipse, and the like.

As shown in FIGS. 1 to 4, the flare processing apparatus 3 includes a base member 4, a slewing bearing 5 fixed to the base member 4, and a rotating plate rotatably provided on the slewing bearing 5. It comprises a rotating member 6, a clamp member 7, a pair of rollers 8, 8, and roller pressing means 9, 9 corresponding to the two rollers 8, 8, respectively, and is installed horizontally.

Hereinafter, the clamp member 7, the pair of rollers 8, 8, and the roller pressing means 9 of the flare processing apparatus 3 will be described in order. The clamp member 7 is arranged above the rotating member 6 so as to face the rotating member 6 and fixed to the rotating member 6 (not shown). When the cylinder 1 (shown in FIG. 5) is set, it is located outside the cylinder 1. Mold 1
Reference numerals 0 and 10 denote inner walls 10A and 10A having a substantially semi-elliptical cross section for holding the outer peripheral surface 1A of the cylindrical body 1. Inner wall 10
A and 10A form the inner peripheral wall surface 11 having an oblong cross section. The inner peripheral wall surface 11 is parallel to the axis of the cylinder 1.
An annular groove 10B having a substantially quadrangular cross section is formed on the inner wall 10A, and an upper wall surface of the annular groove 10B serves as a ring-shaped receiving portion 12 for receiving the opening end 2. Ring-shaped receiving part 12
Is a plane perpendicular to the inner peripheral wall surface 11 (the cylindrical body 1).
At right angles to the axis L0 of the inner peripheral wall surface 1).
It has escaped from 1 radially outward. The jaw 13 forming the lower part of the annular groove 10B protrudes radially inward from the inner peripheral wall surface 11 and is set when the cylindrical body 1 is set.
By abutting the opening end 2 on the upper side, positioning in the height direction in the clamp member 7 is secured.

The two rollers 8, 8 are arranged inside the clamp member 7 so as to face each other, and the axis L thereof is parallel to the axis L0 of the cylindrical body 1. Center point 2C, which is the intersection of major axis 2A and minor axis 2B of part 2
They are arranged symmetrically with respect to (corresponding to the rotation center 6A of the rotating member 6). In addition, this center point 2C is the cylindrical body 1
On the axis L0. The roller 8 has an annular projection 14 that sandwiches the opening end 2 between the roller 8 and the ring-shaped receiving portion 12.
have. As shown in FIG.
Is located at a height facing the ring-shaped receiving portion 12 in the annular groove 10B, and the height of the annular projection 14 is smaller than the groove width of the annular groove 10B. Annular projection 14
The upper surface 14A is substantially the same height as the ring-shaped receiving portion 12, and is located at a position lower than the ring-shaped receiving portion 12 by the thickness of the opening end 2 + the clearance. The top end 14B of the annular projection 14 forms an R-shaped portion.

The roller pressing means 9 includes the rotating member 6
And supports the lower portion of the roller 8 and presses the annular projection 14 of the roller 8 toward the radially outward direction orthogonal to the axis L0 of the cylindrical body 1 onto the opening end 2. And a cylinder 16 composed of an air cylinder. A shaft portion 17 is provided on the rotating member 6, and the arm 15
The base 15A is rotatably mounted on the shaft 17 so as to be rotatable in the horizontal direction about the base 15A. The base 16A of the cylinder 16 is pin-connected to the rotating member 6 so as to be freely rotatable in the horizontal direction. Further, a pin 15D is rotatably mounted on a hole 15C of an intermediate portion 15B of the arm 15 and a piece 15E is integrally attached to a lower end of the pin 15D. The distal end 18A of the rod 18 of the cylinder 16 is fixed to this piece 15E.
Thus, the rod 15 of the cylinder 16 is attached to the arm 15.
The cylinder 16 is rotatable on the rotating member 6 in the horizontal direction about its base 16A. When the cylinder 16 is actuated, the rod 18 of the cylinder 16 expands and contracts, and the arm 15 rotates in the horizontal direction around the shaft 17, whereby the roller 8 is moved in the radial direction. .

Next, the operation of the present embodiment will be described. In the present embodiment, the cylindrical body 1 includes (A) a preparation step,
(B) a setting process of a cylinder, (C) a flare processing process,
(D) Flare processing is performed in the order of the removal process of the cylindrical body. This will be described below. (A) Preparation Step As shown by the two-dot chain line (A) in FIG.
Is moved radially inward by the cylinders 16 and 16 via the arms 15 and 15 and escapes from the cylindrical body 1 radially inward.

(B) Setting Step of the Cylindrical Body The cylindrical body 1 shown in FIG. 5 is inserted and set inside the ring-shaped receiving portion 12. In this set state, the cylinder 1 is positioned with respect to the ring-shaped receiving portion 12, and FIG.
State. When the arms 15, 15 are rotated by operating the cylinders 16, 16, both rollers 8, 8 are moved radially outward. As a result, the state shown by the two-dot chain line (b) in FIG. In the clamped state, the open end 2 is sandwiched between the annular protrusion 14 of the roller 8 and the ring-shaped receiving portion 12 of the clamp member 7.

(C) Flare Processing Step With the rotation of the rotating member 6, the roller pressing means 9, 9 provided on the rotating member 6 also rotates, and both rollers 8, 8 move in the circumferential direction of the opening end portion 2. Turn. For example, both rollers 8, 8
Is moved from the two-dot chain line (b) in FIG. 1 to the two-dot chain line (c) in FIG. 1, and further proceeds to the two-dot chain line (d) in FIG.

At this time, due to the spring action of the air of the cylinders 16, 16, the annular projection 14 of the roller 8 causes a force F directed radially outward perpendicular to the axis L 0 of the cylindrical body 1 (see FIG. 4B). ) Is given. Due to the annular projection 14 of the roller 8,
The open end 2 is pressed onto the ring-shaped receiving portion 12 of the clamp member 7. In this state, as shown in FIG. 4B, the opening end 2 is bent at a substantially right angle outward in the radial direction.

The opening end 2 receives a partial force at the portion of the roller 8 pressed by the annular projection 14,
Partially bent. With the rotation of the rotating member 6,
Both rollers 8 are rolled along the circumferential direction of the opening end 2. In addition, since the rollers 8 and 8 are symmetrically disposed about the center point 2C of the opening end 2, the opening end 2 is flared at two places by the rollers 8 and 8 at the same time. When two portions of the open end 2 where the two rollers 8, 8 are in contact with each other are simultaneously flared by the two rollers 8, a pressing force is applied to two portions of the open end 2. The reaction forces of the cylindrical body 1 generated with respect to the two pressing forces have the same magnitude and face each other, so that the positioning balance of the cylindrical body 1 is ensured, and the positioning state of the opening end 2 is securely held. Have been.

When the rotating member 6 is rotated by 180 degrees, the rollers 8, 8 are turned half a turn, and the open end 2 is flared over the entire circumference. Thus, the flare processing step is completed. (D) Taking Out of the Cylindrical Body When the flaring process is completed, the rollers 8, 8 return to their original positions, and are in the state shown in FIG.

Further, by operating the cylinders 16, 16, both rollers 8, 8 are moved through the arms 15, 15.
Is moved inward. Both rollers 8, 8 are in the state shown by the two-dot chain line (a) in FIG. That is, the unclamped state (the state in which the roller 8 has escaped to the inside of the cylindrical body 1) is selected for the opening end portion 2. In this way, both rollers 8,
8 returns to the initial state, and after the clamp member 7 is removed, the cylinder 1 is taken out.

The tubular body 1 having the open end 2 flared is used, for example, for a muffler shell (not shown) mounted on an exhaust system of an automobile. According to the above configuration, the following effects can be obtained. First, the annular projection 1
In a state where the open end 2 is pressed against the ring-shaped receiving portion 12 of the clamp member 7 by the rollers 4, 14, the rollers 8, 8 are rolled along the open end 2.
Has an effect of being able to perform flaring even if it has an oval cross section.

Secondly, the opening end 2 is formed by both rollers 8 and 8.
Is partially bent by applying a force from the inside to the outside of the diameter, so that only the force for bending the opening end portion 2 to the outside is sufficient, and the processing force of the flare processing can be reduced. In addition, the opening end 2 formed by the annular projections 14 is
The opening end 2 is bent onto the ring-shaped receiving portion 12 by cooperating the pressing force for pushing outward in the diameter perpendicular to the axis L0 of the roller and the rotating force of the rollers 8, 8. The force for bending the portion 2 is reduced, and the force for bending the opening end 2 can be made smaller than when only the pressing force is applied. Therefore, an axial force equivalent to the pressing force of the conventional punch is not required, and buckling of the cylindrical body 1 can be prevented.

Third, since the roller 8 is used, the roller 8 rotates by itself, so that the wear of the roller 8 can be reduced and the durability can be improved. Scratches can be prevented. Fourth, by exchanging only the clamp member 7, the opening end 2 having a substantially elliptical cross section, a perfect circular cross section, or a cross section having a different size can be flared. No work is required, and setup work can be facilitated.

Fifth, both rollers 8, 8 are connected to the open end 2.
Are arranged symmetrically about the center point 2C of
When two portions of the opening end 2 where the two rollers 8 and 8 are in contact with each other are simultaneously flared by the two rollers 8 and 8, pressing force is applied to two portions of the opening end portion 2 and the pressing force of the two portions is used. As a result, the positioning balance of the cylindrical body 1 is ensured, and the positioning state of the opening end 2 is reliably maintained, so that the quality of bending of the opening end 2 can be ensured.

Sixth, the cooperating operation of the rotation of the rotating member 6 and the operation of pressing the open end 2 onto the ring-shaped receiving portion 12 by the roller pressing means 9, 9 allows the open end to be opened. In a state where the portion 2 is pressed onto the ring-shaped receiving portion 12 of the clamp member 7, the rollers 8, 8 can be rolled along the circumferential direction of the open end 2, and Can be flared.

Seventh, since the ring-shaped receiving portion 12 is at right angles to the axis L0 of the cylindrical body 1, flare processing for bending the opening end portion 2 at right angles can be performed. 8th
In addition, by moving both rollers 8, 8 in the radial direction by the cylinder 16, the setting operation and the unloading operation of the cylindrical body 1 can be reliably performed. Note that, in the present embodiment, an example in which the flare processing device 3 is installed in a horizontal state has been described, but the flare processing device 3 may be installed in a vertical state. Also, the example in which the clamp member 7 is arranged in a state (not shown) fixed to the rotating member 6 has been described.
The clamp member 7 can be fixed to a member other than the rotating member 6.

Further, in the present embodiment, the case where the rotating member 6 is rotated by 180 degrees and the rollers 8, 8 are turned half a turn has been described, but the present invention is not limited to such a case. For example, while checking the bent state of the opening end 2, the rotating member 6 is rotated, the rollers 8, 8 are turned one or more turns, and the opening end 2 is flared twice or more over the entire circumference. You can also. In this case, the bending force of the opening end 2 can be gradually changed to a steep angle in the second and subsequent times by further reducing the processing force to bend the opening end 2.

Further, in the present embodiment, the ring-shaped receiving portion 12 is perpendicular to the inner peripheral wall surface 11 (perpendicular to the axis L0 of the cylindrical body 1).
Without being limited to such a cross section, the ring-shaped receiving portion 12 may be inclined at a predetermined angle with respect to the axis L0 of the cylindrical body 1 to form a conical tapered surface. Thereby, the opening end 2 can be flared in a conical shape. Also, in this case, the upper surface of the annular projection of the roller may be a conical tapered surface corresponding to the conical tapered surface of the ring-shaped receiving portion.

In the present embodiment, the roller pressing means 9 is constituted by one arm 15 and one cylinder 16, but the roller pressing means 9 supports the pair of rollers 8 and 8, respectively. The base 15A on the rotating member 6,
A pair of arms 15, 15 respectively provided rotatably about 15 A, and bases 16 A, 1 on the rotating member 6.
The two arms 15, 1 are provided rotatably about 6A.
5 at the distal ends 18A, 18A of the rods 18, 18, respectively.
And a pair of cylinders 16 and 16 connected to each other.

Further, in this embodiment, the number of cylinders is two. However, as shown in FIG. 7, another roller pressing means having one cylinder may be used. That is, in FIG.
The two arms 22, 22, which respectively support the rollers 8, 8 and rotate on the rotating member 6 around the bases 22A, 22A, the base 24A is connected to one arm 22 and the other arm It is also possible to use a single cylinder 24 in which the tip side 23A of the rod 23 is connected to the cylinder 22.

Further, in the present embodiment, the roller pressing means 9 employs the cylinders 16, 16. However, instead of these, a rotary linear conversion mechanism is employed, and the length of the rotary linear conversion mechanism is reduced. By synchronizing the rotation with the rotation angle of the rotation member 6, the rotation linear conversion mechanism can be expanded and contracted, and the arm can be rotated. In addition, in the present embodiment, an example in which an air cylinder is used as an example of a cylinder, and an example in which a spring action by air of the air cylinder is used has been described, but the present invention is not limited to the air cylinder, and uses, for example, hydraulic pressure. You can also. Also, a spring material can be used, or an air cylinder containing a spring material can be used.

[0041]

According to the first aspect of the present invention, the following effects can be obtained. First, by pressing the annular projection of the roller toward the radially outward direction perpendicular to the axis of the cylindrical body onto the open end of the cylindrical body, the open end is bent onto the ring-shaped receiving portion,
Since the annular protrusion is rolled along the circumferential direction of the opening end, even if the opening end of the cylindrical body has a substantially elliptical cross section, the diameter of the opening end of the cylindrical body is increased to achieve flare. The effect that processing can be performed is exhibited.

Secondly, since the roller is used to partially bend the opening end of the cylindrical body from the inside to the outside with a pressing force,
It only needs to bend the opening end part radially outward,
The processing power of flare processing can be reduced. Moreover, by cooperating the pressing force for pushing the open end of the cylindrical body by the annular projection of the roller outward in a direction perpendicular to the axis of the cylindrical body and the rotating force of the roller, the open end of the cylindrical body is formed. Since the bending is performed on the ring-shaped receiving portion, the force for bending the opening end is reduced, and the force for bending the opening end can be reduced as compared with the case where only the pressing force is applied.

Therefore, an axial force equivalent to the conventional punch pressing force is not required, and buckling of the cylindrical body can be prevented. Third, since the rollers are used, the wear of the rollers can be reduced, the durability can be improved, and the surface of the opening end 2 can be prevented from being damaged. Fourth,
By exchanging only the ring-shaped receiving portion, the opening end of the cylindrical body having a substantially elliptical cross section, a perfect circular cross section, or a cross section having a different size can be flared. It becomes unnecessary and the setup work can be facilitated.

According to the second aspect of the present invention, the number of rollers is two, and both rollers are symmetrically arranged around the center point of the opening end of the cylindrical body. When simultaneously flaring two places where the two rollers of the end contact each other, pressing force is simultaneously applied to two places at the opening end of the cylindrical body, and the cylindrical body is secured by the two pressing forces,
There is an effect that the positioning state of the opening end of the cylindrical body is reliably held, and the quality of bending of the opening end of the cylindrical body can be reliably ensured.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, the rotating operation of the rotating member,
By cooperating with the operation of pressing the open end of the cylindrical body onto the ring-shaped receiving portion by the roller pressing means, the roller is opened while the open end of the cylindrical body is pressed onto the ring-shaped receiving portion. Rolling can be performed along the circumferential direction of the end portion, and the opening end of the cylindrical body can be flared by expanding its diameter.

According to the fourth aspect of the invention, the same effects as those of the second aspect of the invention can be obtained. According to the invention described in claim 5, in addition to the effect of the invention described in claim 2, by moving the two rollers in the radial direction by the cylinder,
The work of setting and taking out the cylinder can be performed reliably.

[Brief description of the drawings]

FIG. 1 is a plan view showing a flare processing apparatus for an end of a cylindrical body according to the present embodiment.

FIG. 2 is a side view showing the flare processing apparatus.

FIG. 3 is a plan view showing a clamp member of the flare processing apparatus.

FIG. 4 is a side view showing a roller of the flare processing apparatus.

FIG. 5 is a perspective view showing a cylindrical body.

FIG. 6 is a sectional view taken along line XX of FIG. 5;

FIG. 7 is an explanatory view showing a modification of the roller pressing means.

FIG. 8 is an explanatory sectional view of a conventional flare processing method by press molding.

FIG. 9 is an explanatory sectional view of a conventional method of flaring a pipe end by spinning.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical body 2 Open end part 3 Flare processing apparatus 6 Rotating member 8 Roller 9 Roller pressing means 12 Ring-shaped receiving part 14 Annular protrusion 15 Arm 16 Cylinder 18 Rod

Claims (5)

[Claims] 1. An annular projection (14) of a roller (8) arranged inside a cylinder (1) is connected to an axis (L0) of the cylinder (1).
A ring disposed outside of the cylindrical body (1) by pressing the open end (2) outside the cylindrical body (1) by pressing the open end (2) of the cylindrical body (1) outward in a radial direction perpendicular to the cylindrical body (1). The annular projection (14) is bent over the shape receiving portion (12), and the annular end (14) is opened.
A method for flaring a cylindrical end portion, wherein the flaring is performed along the circumferential direction. 2. The number of rollers (8, 8) is two, and both rollers (8, 8) are arranged symmetrically with respect to the center point of the open end (2) of the cylindrical body (1). 2. The method for flaring a cylindrical body end according to claim 1, wherein: 3. A rotary member (6) for expanding the diameter of an open end (2) of a cylindrical body (1), said rotary member (6).
A ring-shaped receiving part (12) fixed at a predetermined angle with respect to the axis (L0) of the cylindrical body (1), and the cylindrical body (12) inside the ring-shaped receiving part (12). A roller (8) having an axis (L) parallel to the axis (L0) of 1) and having an annular projection (14); and a roller (6) provided on the rotating member (6) to support the roller (8). A roller pressing means (9) for pressing the annular projection (14) of the roller (8) toward the radially outward direction orthogonal to the axis (L0) of the cylindrical body (1) on the opening end (2).
A flare processing device for a cylindrical end portion, comprising: 4. The number of rollers (8, 8) is two, and both rollers (8, 8) are arranged symmetrically about the center point of the open end (2) of the cylindrical body (1). The flare processing apparatus for a cylindrical body end according to claim 3, wherein: 5. The number of rollers (8, 8) is two, and both rollers (8, 8) are arranged symmetrically with respect to the center point of the open end (2) of the cylindrical body (1). The roller pressing means (9, 9) includes a pair of arms (15) respectively supporting the rollers (8, 8) and provided on the rotating member (6) so as to be rotatable around a base. , 15), and a pair of cylinders (20) rotatably provided around the base on the rotating member (6), and the distal ends of rods (18, 18) connected to the arms (15, 15), respectively. The flare processing apparatus for a cylindrical body end according to claim 3, further comprising (16, 16).