JPH0760385A - Expansion and drawing method of pipe - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention aims to improve workability and shorten work time,
In addition, it aims to reduce the work space and cost. According to the pipe expanding / pulling-out method of the present invention, a mandrel rod 3 is inserted from the rear end of the pipe 1 in which a die 5 is previously arranged on the outer periphery, and the mandrel rod 3 protruding from the end of the pipe 1 is expanded. The plug 4 is fixed, the expansion plug 4 is retracted with the pipe 1 fixed, and a free end 7 expanded to an outer diameter larger than the inner diameter of the die 5 is formed at the tip of the pipe 1. 7, the die 5 is advanced with the expansion plug 4 inserted, and the pipe 5 is advanced together with the die 5 by the contact between the die 5 and the free end 7.
The dice 5 is housed in the die plate 8 located at the front, the free end 7 is held by the carriage 9, and the free end 7 is pulled by the carriage 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe expanding / pulling-out method, and more particularly to a pipe expanding / pulling-out method for improving workability, reducing working space and reducing costs.

[0002]

2. Description of the Related Art As a conventional pipe expanding / drawing method, there is, for example, a method in which a device with a pipe expanding port and a pipe expanding / drawing device are used together.

As shown in FIG. 3, the device with a pipe expanding port is composed of a cylinder mechanism 13 and a pipe expanding rod 14 which moves in the direction of the arrow by the cylinder mechanism 13. The pipe expanding rod 14 is attached to one end of the pipe 1 with the pipe 1 fixed. Is inserted to form the tube-expansion-attached portion 7.

On the other hand, as shown in FIG. 4, the pipe expanding / drawing device includes a mandrel rod 3 which is passed through the pipe 1 and a expanding plug which is fixed to the tip of the mandrel rod 3 inside the pipe expanding port attaching portion 7. 4, a chuck 9 for sandwiching the tube expansion part 7 and a core 12, a carriage 9 for pulling the tube expansion part 7 in the direction of the arrow, and a die for expanding the pipe 1 in cooperation with the expansion plug 4. 5 and a die holder 8 for fixing the die 5 to the outer peripheral portion of the pipe 1, the carriage 9 is moved in the direction of the arrow, and the pipe 1 is pulled out from the die 5 and the expansion plug 4 Expand 1.

[0005]

However, according to the conventional pipe expanding and drawing method, as described above, since the pipe expanding device with the pipe expanding port and the pipe expanding and drawing device in different lines are expanded in different steps, the pipe is expanded. There are disadvantages that the work such as the removal and installation of the equipment becomes troublesome, the working time increases, and the working space increases by the amount of the site area of the two facilities. Further, since the expanding rod has to be manufactured for each size, there is a disadvantage that the cost is increased.

Therefore, an object of the present invention is to provide a pipe expanding / pulling-out method capable of improving workability, shortening working time, reducing working space, and further reducing cost.

[0007]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a pipe in which a die is preliminarily arranged on the outer periphery in order to improve workability, work time, work space and cost. Insert the mandrel rod from the rear end, fix the expansion plug to the mandrel rod protruding from the tip of the pipe, retract the expansion plug with the pipe fixed, and make the diameter larger than the inner diameter of the die at the tip of the pipe. Forming a free end that is expanded to the outside diameter, and moving the die forward with the expansion plug inserted in the free end, and advancing the pipe with the die by the contact between the die and the free end, and moving forward. (EN) A pipe expanding / withdrawing method in which a die is housed in a positioned die plate, a free end is clamped by a carriage, and the free end is pulled by the carriage.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The pipe expanding and drawing method of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows the overall structure of a pipe expanding and drawing apparatus applied to an embodiment of the present invention. The pipe expanding / drawing device includes a clamp device 2 for holding the pipe 1, a expanding plug 4 fixed to the tip of a mandrel rod 3, a die slide 6 which moves in the arrow direction by a cylinder mechanism described later, and a die slide 6 And a die plate 8 for accommodating the pipe, and a pipe expansion portion (free end) formed on the pipe 1.
A carriage 9 for sandwiching and pulling 7; a back stand 10 for setting the horizontal and vertical positions of the plug 4; and a cylinder mechanism 1 for moving the mandrel rod 3 in the arrow direction.
It is composed of 6.

After the mandrel rod 3 is inserted from the rear end of the pipe 1, the expanding plug 4 is fixed to the front end of the mandrel rod 3 protruding from the front end of the pipe 1.

As shown in FIG. 2, the die slide 6 has a die 5 and is supported by a cylinder mechanism 15. As described above, the die slide 6 is configured to move in the horizontal direction by the operation of the cylinder mechanism 15. Has been done.

The pipe expanding and drawing method of the present invention will be described below. First, pipe 1 to die slide 6 and die 5
After fixing to the clamp device 2 in the form of being passed through, the mandrel rod 3 is inserted from the rear end of the pipe 1 and the tip thereof is projected from the tip of the pipe 1. For disposing the die 5 on the outer periphery of the pipe 1, the die slide 6 is moved forward, the pipe 1 is fixed to the clamp device 2, and then the die slide 6 is placed.
May be moved backward.

Next, the expanding plug 4 is fixed to the tip of the mandrel rod 3 protruding from the tip of the pipe 1.

Then, the cylinder mechanism 16 is operated to
The expansion plug 4 at the tip of the mandrel rod 3 is retracted to form an expansion opening portion 7 having an outer diameter larger than the inner diameter of the die 5 at the tip of the pipe 1.

After that, the clamp 2 is opened, the die slide 6 is moved forward by the operation of the cylinder mechanism 15, and the pipe 1 is moved forward together with the die slide 6 by the contact between the die slide 6 and the pipe expanding port attaching portion 7. The die 5 is housed in the die plate 8 located in the front,
The tube expansion part 7 is held by the carriage 9. As described above with reference to FIG.
And the core 12 can be performed.

Finally, by moving the carriage 9 in the direction of the arrow and pulling the sandwiched tube-expansion portion 7, the pipe 1 is expanded by the cooperation of the expansion plug 4 and the die 5.

As can be seen from the above embodiments, in the pipe expanding and drawing method of the present invention, the pipe expanding and drawing process is performed by the pipe expanding and drawing device so that the pipe is expanded in one line. For this reason, it is possible to improve workability without troublesome work such as removal and installation of the pipe.
Moreover, since it can be performed by one device, the site area can be reduced.

[0018]

As described above, according to the pipe expanding / pulling-out method of the present invention, the mandrel rod is inserted from the rear end of the pipe, which has been previously passed through the die, and the mandrel rod is protruded from the front end of the pipe. The expansion plug is fixed to the pipe, the expansion plug is retracted while the pipe is fixed, the free end expanded to an outer diameter larger than the inner diameter of the die is formed at the tip of the pipe, and the free end is expanded. The die is advanced with the opening plug inserted, the pipe is advanced with the die by the contact between the die and the free end, the die is housed in the die plate located in the front, and the free end is clamped by the carriage. Since the free end is pulled by the carriage, workability is improved, work time is shortened,
The work space can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an overall view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a die slide according to an embodiment.

FIG. 3 is an explanatory view showing a conventional pipe expanding and drawing method.

FIG. 4 is an explanatory view showing a conventional pipe expanding and drawing method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pipe 2 Clamping device 3 Mandrel rod 4 Expansion plug 5 Dies 6 Dice slide 7 Portion with expansion pipe (free end) 8 Dice plate 9 Carriage 10 Back stand 11 Chuck 12 Core 13 Cylinder mechanism 14 Expansion rod 15 Cylinder mechanism 16 Cylinder mechanism

Claims (1)

[Claims] 1. A state in which a mandrel rod is inserted from the rear end of a pipe in which a die is arranged in advance on the outer periphery, and a spreading plug is fixed to the mandrel rod protruding from the tip of the pipe, and the pipe is fixed. With the expansion plug retracted, a free end expanded to an outer diameter larger than the inner diameter of the die is formed at the tip of the pipe, and the expansion plug is inserted into the free end. Advancing the die, advancing the pipe together with the die by contact between the die and the free end, accommodating the die in a die plate located in front, and nipping the free end with a carriage, A method for expanding and withdrawing a pipe, characterized in that the free end is pulled by a carriage.