JP2010142821A - Tool for preventing inside-diameter buckling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool for preventing inside-diameter buckling, which is easily attached to and detached from the inside of a pipe material while preventing a part of the pipe material from buckling inside in the plastic working of the pipe material. <P>SOLUTION: The tool has a shaft which is inserted into the inside of the pipe material, a base plate which is fixed to the shaft and a stopper plate at a prescribed interval from the base plate, a plurality of guide members provided between the base plate and the stopper plate and also has blocks which are moved along each guide member. The blocks are composed of moving blocks which are brought into contact with each other on a tapered surface and movement limiting blocks the movement of which is limited so that the travelling distance is shorter than that of the moving block. When the blocks are situated on the side of the base plate, the inside diameter of the pipe material is restrained with the moving blocks and the movement limiting blocks and, when the blocks are moved along the guide member on the side of the stopper plate, the blocks contract the diameter inside by the sliding between the moving blocks and the movement limiting blocks the travelling distance of which is limited to be shorter than that of the moving blocks. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a jig for preventing a pipe material from buckling inward when an end portion of the pipe material is processed.

When providing a flange or the like at the end of the pipe material, a method of welding the flange member to the pipe and a method of integrally forming the flange portion by machining at the end of the pipe material are generally employed. Yes.
For example, the applicant of the present application has disclosed a flange processing method as disclosed in Patent Document 1 and shown in FIG.
The contents will be described with reference to FIG. 6. The pipe material 1 is sandwiched and held by the upper clamp 2 a and the lower clamp 2 b, and the primary roller 3 is revolved and rotated on the end 1 a of the pipe material 1 to about 40 to 45 °. Bending until diameter is increased.
Next, a processing method for forming a flange portion integrally with the end portion of the pipe material by revolving and rotating the secondary roller 4 having a larger tip angle than the primary roller 3 and bending the end portion 1a to 90 °. It is.
In this case, when plastically deforming so that the diameter of the end portion is expanded, the inner side on the far side is likely to buckle slightly from the bending start point of the pipe material.
Therefore, conventionally, as shown in FIG. 6, an outer diameter disk-shaped cored bar jig 110 is set to be inserted inside the pipe.
This makes it possible to suppress buckling in the vicinity of the bending start point of the pipe material, but the inner surface of the pipe material is not easily attached to the outer peripheral surface of the core metal jig, and is extremely useful for extracting the core metal jig from the pipe after flange processing. There was a problem that a large force was required and the shaft 111 was easily damaged.

Japanese Patent Laid-Open No. 2001-205367

  An object of the present invention is to provide an inner diameter buckling prevention jig that can be easily attached to and detached from the inside of a pipe material while preventing a part of the pipe material from buckling inward during plastic processing of the pipe material.

  An inner diameter buckling prevention jig of a pipe material according to the present invention is a jig for restraining the inner diameter of a pipe material to be processed and preventing buckling inward, and a shaft to be inserted inside the pipe material And a base plate fixed to the shaft and a stopper plate with a predetermined distance from the base plate, a plurality of guide members are provided between the base plate and the stopper plate, and a piece that moves along each guide member The frame is composed of a moving frame and a movement limiting frame limited so that the moving distance is shorter than that of the moving frame, and moves when the frame is located on the base plate side. The inner diameter of the pipe material is constrained by the top piece and the movement restriction piece, and when the piece moves to the stopper plate side along the guide member, the piece is moved by the displacement between the moving piece and the movement restriction piece whose movement distance is restricted to be shorter Is inside Characterized in that it is intended to diameter.

As a result, the moving piece and the movement restricting piece are positioned on the base plate side and inserted into the pipe material to be machined in a state where a cylindrical outer peripheral part is formed, thereby performing plastic working such as end flange processing. Prevents buckling deformation to the inside, and moves between the movement restriction piece and the movement restriction piece, the movement distance of which is restricted to be relatively short when the shaft is pulled out from the inside of the pipe material after processing is completed. Since the movement frame and the movement restriction frame are in contact with the tapered surface, these frames move in the direction of reducing the diameter.
Accordingly, since the outer diameter of the jig is reduced, a gap is formed between the inner peripheral surface of the pipe material and the outer peripheral surface of the jig, and the jig can be easily extracted from the inside of the pipe material. it can.

  In the present invention, when the moving piece and the movement restricting piece are elastically biased toward the base plate along the guide member, the piece is automatically moved by the elastic member when the shaft is pulled and the jig is pulled out from the inside of the pipe material. Return to the base plate side.

  In addition, when a disc-shaped base portion of the base plate and a truncated cone-shaped reduced diameter portion are provided on the stopper plate side ahead of the base plate, it is easy to move the frame along the side surface of the truncated cone.

  In the inner diameter buckling prevention jig according to the present invention, when the moving piece and the movement restricting piece are located on the base plate side, a cylindrical outer peripheral portion is formed by a side butt of the moving piece and the movement restricting piece. In this state, by inserting it so as to match the inner diameter of the pipe material, the pipe material is prevented from buckling inward, and after the plastic working is finished, when moving the shaft with the base plate fixed, the moving piece and movement restriction By moving toward the stopper plate so that the pieces are displaced from each other, the outer diameter of the jig is reduced even if the pipe inner surface bites against the outer surface of the piece during plastic processing. It can be easily extracted from the inside of the pipe material.

An example of the inner diameter buckling prevention jig 10 according to the present invention will be described below with reference to the drawings.
In addition, although a present Example demonstrates the process which plastically shapes a flange part to the edge part 1a of the pipe material 1 using the continuous processing apparatus by a primary roller and a secondary roller, the jig | tool which concerns on this invention is to this. It is not limited and can be widely deployed as a jig for restraining the inner peripheral surface of the pipe material.

FIG. 5 shows a flow of flange processing on the end portion of the pipe material 1 using an inner diameter buckling prevention jig (hereinafter simply referred to as a jig) 10 according to the present invention, and FIG. 1 shows a state in which a jig is inserted, and FIG. 1B shows an explanatory diagram of a state in which the flange processing of the end 1a is completed and the jig is extracted from the inside of the pipe material 1.
FIG. 3 is a diagram for explaining the movement of the moving piece 14 and the movement restricting piece 15, and cross-sectional views thereof are shown in FIGS.

The jig 10 according to the present invention connects a substantially disc-shaped base plate 12 and a stopper plate 13 with a predetermined distance from the tip of a shaft 11 for insertion and extension inside the pipe material 1. It is.
Between the base plate 12 and the stopper plate 13, there is provided a stopper pin 16 that protrudes from the guide member 17 and the stopper plate 13 to the base plate 12 side by a predetermined height.
In this embodiment, as shown in FIG. 4, the connection between the stopper plate 13 and the shaft 11 and the fixing of the guide member 17 and the stopper pin 16 are turned on by the bolts 11a, 16a and 17a, but this is not limitative.
In the figure, there are a moving piece 14 and a movement restricting piece 15 that move to the left and right along the guide member 17, and the moving piece 14 and the movement restricting piece 15 are located outside from the center as shown in FIGS. The long guide holes 14a and 15a are movable between the base portion 12 and the stopper plate 13 and in the central direction.
The movement restriction piece 15 is set so as to interfere with the stopper pin 16 and the movement distance is shorter than that of the movement piece 14.

As shown in FIG. 4, the moving piece 14 and the movement restricting piece 15 have a shape that is divided into a fan shape as viewed from the front, and are made up of divided cylindrical portions 14d and 15d and divided truncated cone portions 14e and 15e. The contact surfaces of the divided cylindrical portion 14d of the top 14 and the divided cylindrical portion 15d of the movement limiting top 15 are straight surfaces 14f and 15f parallel to the shaft axis, and form a cylindrical portion as a whole.
On the other hand, the contact surfaces of the divided truncated cone parts 14e and 15e are tapered surfaces 14c and 15c in the direction in which the moving piece moves inwardly, and the moving piece 14 and the movement restricting piece 15 are provided as guide members. 17 is elastically biased toward the base plate 12 side by an elastic member 18 formed of a coil spring attached to the base plate 17.
Note that the taper surface 15e of the movement limiting piece 15 has a narrow width on the front side of the paper so that the moving piece 14 can move toward the inside of the paper in FIG. The direction is a tapered surface.
Therefore, the taper surface 14e of the moving piece 14 is a taper surface in the opposite direction.

The base plate 12 has a base portion 12b whose outer peripheral surface is cylindrical, and a truncated cone-shaped reduced diameter portion 12a which is then reduced in diameter toward the stopper plate 13 side.
At the stage of inserting the jig 10 inside the pipe material 1, as shown in FIG. 1A, the moving piece 14 and the movement restricting piece 15 are pressed by the elastic member 18 toward the base plate 12 side. The inner cylindrical portion 14b of the top 14 and the inner cylindrical portion 15b of the movement restricting top 15 are located on the outer peripheral portion of the base plate 12b, and the outer diameter (14d, 15d) of the entire top is cylindrical, and the inner peripheral surface of the pipe Is held to match.
In this state, the moving piece 14 and the movement restricting piece 15 are contact-constrained with each other by the straight surfaces 14f and 15f to form a cylindrical portion, so that the inner diameter of the pipe material can be prevented from buckling.
Further, since the moving piece 14 and the movement restricting piece 15 form a cylindrical portion as a whole, the diameter is not reduced and the outer peripheral surface of the base plate 12 is not eaten.

Next, when the jig 10 is pulled out from the inside of the pipe material 1, when the shaft 11 as shown in FIG. 1B is pulled in the direction of the arrow f, the outer peripheral surfaces of the moving piece 14 and the movement restricting piece 15 are moved. When the pipe member 1 bites into the inner peripheral surface, only the base plate 12 tends to be pulled out by the shaft 11.
The moving piece 14 and the movement restricting piece 15 relatively move toward the stopper plate 13 as shown in FIG.
When the frame moves by a length corresponding to the thickness of the base portion 12 b of the base plate 12, the inner cylindrical portions 14 b and 15 b of the moving piece 14 and the movement restricting piece 15 are contracted as shown in FIG. It moves to the diameter part 12a side.
At this time, the movement limiting piece 15 abuts against the stopper pin 16 and cannot move any more, but the moving piece 14 having no stopper pin 16 further moves to the stopper plate side.
As shown in FIG. 1 in this state (b), dividing frustoconical portion 14e of the movable frame 14 and the movement restricting piece 15, the contact surfaces of the 15e (split surface) Since the tapered surface 14c, 15c, _{S 1} and also it moves in the direction of Sr reduced in diameter not only in the direction of S _2.
As a result, a gap is generated between the constraining surface 1b of the pipe material 1 and the outer peripheral surfaces (14d, 15d) of the frame, and the jig 10 is extracted to the outside.
The extracted jig 10 returns to its original state as shown in FIG.

Next, an example of plastic working of the flange portion using the jig 10 according to the present invention will be described with reference to FIG.
As shown in FIG. 5A, the pipe material 1 is clamped and held by an upper clamp 2a and a lower clamp 2b with an end 1a serving as a flange protruding.
The jig 10 held at the tip of the shaft 11 is inserted inside from the end opening of the pipe member 1.
Next, as shown in FIG. 5 (b), the primary roller 3 that revolves and rotates is subjected to a bending process for expanding the end 1a to a bending angle of about 40 to 45 °.
When the primary processing is completed by the primary roller 3, the flange portion is bent to 90 ° by the secondary roller 4 that revolves and rotates while the bending start point is pressed by the primary roller 3.
When the plastic working of the flange portion is completed, the primary and secondary rollers are retracted, and the jig 10 is removed by retracting the shaft 11.
The pipe material that has been processed is unclamped in the vertical direction by the upper and lower clamps 2a and 2b, and is removed from the processing apparatus.

The external view of the internal diameter buckling prevention jig which concerns on this invention is shown. Sectional drawing of an internal diameter buckling prevention jig | tool is shown. It is a figure for demonstrating the motion of a top, (a) shows the state which the top returned, (b) shows the state where the top moved a little to the stopper board side, and (c) shows the top to the stopper side. Indicates the moved state. Each sectional view of the jig is shown. The example which processes the edge part of a pipe material using the jig | tool which concerns on this invention is shown. An example of a conventional jig is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe material 2a Upper clamp 2b Lower clamp 10 Inner diameter buckling prevention jig 11 Shaft 12 Base plate 12a Reduced diameter part 13 Stopper pin 14 Moving piece 14d Division cylindrical part 14e Division truncated cone part 15 Movement restriction piece 15d Division cylinder part 15e Division Frustum 17 Guide member 18 Elastic member

Claims (3)

A jig for restraining the inner diameter of the pipe material to be processed and preventing buckling to the inside,
A shaft inserted inside the pipe material, a base plate fixed to the shaft, and a stopper plate with a predetermined distance from the base plate;
While providing a plurality of guide members between the base plate and the stopper plate, it has a top that moves along each guide member,
The frames are composed of a moving frame and a movement-restricted frame that is restricted so that the moving distance is shorter than the moving frame. If the frame is located on the base plate side, it moves with the moving frame. Constrain the inner diameter of the pipe material with the limit piece,
The inner diameter is characterized in that when the frame moves to the stopper plate side along the guide member, the frame shrinks inward due to a shift between the moving frame and a movement limiting frame whose movement distance is limited to a shorter distance. Buckling prevention jig.   The inner diameter buckling prevention jig according to claim 1, wherein the moving piece and the movement restricting piece are elastically biased toward the base plate along the guide member.   The base plate has a disk-shaped base portion and a truncated cone-shaped reduced diameter portion provided on the stopper plate side of the disk-shaped base portion. Internal diameter buckling prevention jig.

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