JPH0647427A - Tube reduction device - Google Patents

Abstract

PURPOSE:To automatically withdraw and set a pull by pulling back a wire pulled out before an inside surface specifying tool and connected with the rear end part of a pull to withdraw the pull and connecting the wire with the front end of the inside surface specifying tool and holding it. CONSTITUTION:The cylindrical inside surface specifying tool 20 is mounted on the front end of a supporting rod 10. The wire 41 is pulled out before the inside surface specifying tool 20 through the inside of the inside surface specifying tool 20 and the front end is connected with the pull 30. The wire 41 is pulled backward and the pull 30 is connected with the front end of the inside surface specifying tool 20 and held. An alignment guide 33 to engage with the inside of the front end part of the inside surface specifying tool 20 is mounted on the central part of the rear end of the pull 30. A bolt 34 is set orthogonally to the center of the guide 33 at a male screw part 33a of the guide 33. The wire 41 is pulled out before the inside surface specifying tool 20 through the inside of a connector 22 and connected with the bolt 34. In this way, the labor for withdrawal and setting of the pull can be abbreviated and the pull is simple in construction and poor in trouble.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puller type tube drawing apparatus, and more particularly to a tube drawing apparatus for automatically collecting and setting the puller.

[0002]

2. Description of the Related Art One of tube drawing methods is a drawing method.
As shown in FIG. 8, this is a method in which a short mouthpiece 2 is formed on the head of the raw tube 1, and a puller 3 is hooked on the mouthpiece 2 and pulled by a drawing machine. Accordingly, the raw pipe 1 is pulled out in front of the die 6 while being restrained from the inner surface side by the inner surface regulating tool 5 attached to the tip of the support rod 4.

The drawing method is a method that can shorten the mouthpiece of the raw pipe and is advantageous for improving the yield when drawing a large diameter pipe. But,
Before drawing, it is necessary to set a puller on the mouthpiece of the raw pipe, and as the puller moves with the pipe to the side of the drawing machine after drawing, pull out the puller from the pipe after drawing. Must be returned to original position. That is, it is necessary to collect the puller and set it on the mouthpiece portion for each drawing.

In order to solve the above-mentioned work problems in the pulling method, a tube drawing device in which a puller is integrated with a drawing machine is disclosed in Japanese Utility Model Laid-Open No. 58-18605 and Japanese Utility Model Laid-Open No. 1-58.
It is described in Japanese Patent No. 135109.

The former device, as shown in FIG.
A rotary head 7 is attached to the tip of the drawing machine, the head 7 is tilted and inserted into the mouthpiece 2 of the base pipe 1 from the front, and then the head 7 is raised in the mouthpiece 2 to make the mouthpiece. Two
To be locked. The latter device has a hollow head 8 divided in the circumferential direction, as shown in FIG. 9 (B).
The diameter of the head 8 is expanded by axial movement of the rod 9 inserted in the axial center portion, and the head portion 8a is locked to the mouthpiece portion 2 of the raw tube 1.

[0006]

In all of these tube drawing devices, the puller is integrated with the side of the drawing machine and is automatically inserted into the mouth of the raw tube from the front, so that puller recovery work is performed. And no set work required. But,
In the former case, the shaft that supports the head cannot be made too thick due to its structure, and therefore the shaft may break when the drawing force is large. Therefore, the drawing force cannot be increased. Further, the latter has a complicated structure, so that it is apt to cause a failure, and there is a problem that the operating rate is lowered.

Further, in any of the devices, it is necessary to work the center of the raw pipe to the center of the die hole before drawing, which leads to a reduction in efficiency and a deterioration in economic efficiency due to equipment addition for the work.

That is, the center of the die hole and the shaft center on the side of the drawing machine are substantially aligned with each other in order to prevent bending of the pipe after drawing. On the other hand, the center of the die hole and the center of the raw pipe before drawing need to be accurately aligned with each other because the mouthpiece at the tip of the raw pipe is inserted into the die hole using itself as a guide and aligned before starting the drawing. There is no. Therefore, normally, the tube is not at the core position, and the core integrated with the drawing machine is misaligned.

When the head is to be hooked on the mouthpiece of the raw tube in such a state, a force in a direction orthogonal to the axis is applied to the head, which may cause deformation or damage. Therefore, it is necessary to align the center of the raw pipe with the center of the die hole before drawing, which lowers the efficiency and requires dedicated equipment for the work, which increases the equipment cost.

An object of the present invention is a structure for automatically collecting and setting a puller, but the structure is simple,
It is an object of the present invention to provide a tube drawing device that has no restriction on drawing force and further does not require an operation for aligning the center of the raw tube with the center of the die hole.

[0011]

The pipe drawing apparatus of the present invention comprises:
In a puller-type tube drawing device, a cylindrical inner surface regulation tool that is attached to the tip of a support rod and holds a ring-shaped plug inside a die, and for centering that fits inside the tip portion of the inner surface regulation tool Has a guide at the center of the rear end, the rear end of which is locked in the mouth of the raw pipe while passing through the die and the tip of which passes through the mouth and projects forward of the raw pipe. A puller that is stretched along the support rod, and a tip portion of the puller extends at least inside the plug of the inner surface regulation tool and is pulled out toward the front of the inner surface regulation tool to be connected to a rear end portion of the puller. And a puller collecting and holding means for pulling the wire backward to collect the puller on the inner surface regulating tool side and for connecting and holding the collected puller to the tip of the inner surface regulating tool. It is characterized by

[0012]

[Operation] When the wire is pulled rearward with the puller being separated from the inner surface regulation tool, the puller retracts toward the inner surface regulation tool,
A guide provided at the center of the rear end of the puller fits into the front end of the inner surface regulation tool. As a result, the pull tab is centered and held at the tip of the inner surface regulation tool.

When the support rod inserted into the tube during the drawing is pushed forward, the mouthpiece of the tube is pushed by the puller and inserted into the die hole, and the tip of the puller moves forward of the mouthpiece. Project. The element tube is drawn by pulling the tip of the puller with a drawing machine.

The puller is separated from the inner surface regulating tool with the drawing, and finally remains in the tip portion of the pipe after the drawing. However, if the wire is pulled, the puller retracts toward the inner surface regulating tool and is pulled out of the pipe after the drawing. It is ejected, and further passes through the inside of the die and is reattached to the tip of the inner surface regulation tool.

That is, in the pipe drawing apparatus of the present invention, basically the same one as the separation type puller used in the general puller type drawing machine is used, and this is collected and set by the wire. . Since the wire passes through the inside of the die and is pulled out in front of the inner surface regulation tool, this does not hinder the drawing.

[0016]

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

FIG. 1 is a vertical cross-sectional side view showing a main part of a pipe drawing apparatus embodying the present invention.

The pipe drawing device is supported horizontally by a cantilever and is moved forward and backward in the direction of the central axis, and the support rod 10.
Cylindrical inner surface regulating tool 20 concentrically attached to the tip of the
And a puller 30 that is detachably connected to the tip of the inner surface regulation tool 20, and a puller recovery holding unit 40 that uses a wire 41.

The inner surface restricting tool 20 comprises a cylindrical shank 2
Has 1. The shank 21 has substantially the same outer diameter as that of the support rod 10, has female screw portions 21a and 21b at both ends, and has a wire passage hole 21c at an intermediate portion. The female screw portion 21 a on the rear end side is the male screw portion 1 provided on the front end surface of the support rod 10.
1, the female screw portion 21b on the front end side is connected to the male screw portion 22a provided on the rear end portion of the cylindrical coupling tool 22. The wire passage hole 21c is for passing the wire 41 of the puller collecting and holding means 40 described later, penetrates the inside and outside of the shank 21, and is inclined with respect to the central axis of the shank 21.

A small-diameter holding portion 22b is located ahead of the male screw portion 22a of the connecting tool 22, and a male screw portion 22c is further located beyond the holding portion 22b.
It has become. An annular holder 23 is externally fitted to the holding portion 22b, and a nut-shaped tightening tool 24 is screwed into the male screw portion 22c, which holds the annular plug 25 concentrically on the tip side of the shank 21. There is.

That is, the inner peripheral surface of the plug 25 is a pair of taper surfaces 25a and 25b whose diameter gradually increases in the front-rear direction, and one taper surface of the plug 25 is formed on the front outer peripheral surface of the holder 23. A taper surface 23a corresponding to 25a is provided, and a taper surface 24a corresponding to the other taper surface 25b of the plug 25 is provided on the rear outer peripheral surface of the fastener 24. Therefore, by fitting the holder 23 to the connector 22 and screwing the fastener 24, the tapered surfaces 23a, 2
4a approaches and the plug 25 is fixed to the outer side.

The inner peripheral surface of the distal end portion of the fastener 24 is a hexagonal shape corresponding to the guide of the puller 30 described later, and is a tapered guide portion 24b whose diameter gradually increases toward the front.

The pull tab 30 has a round bar-shaped main body 31. The tip of the main body 31 is a large-diameter head 31a connected to the drawing machine. The base end portion of the main body 31 is a cylindrical connecting portion 31b, and the outer peripheral surface thereof is provided with a male screw and the inner peripheral surface thereof is provided with a female screw. A nut-shaped locking tool 32 is screwed into the male screw of the connecting portion 31b.
The locking tool 32 is sized to be locked in the mouthpiece of the tube and pass through the die hole. The head 31
“A” has a smaller diameter than the locking tool 31, passes through the mouthpiece of the base pipe, and projects in front of the mouthpiece in a state where the locking tool is locked in the mouthpiece.

A cylindrical guide 33 is concentrically screwed into the female screw of the connecting portion 31b, leaving the rear end portion. That is, the portion of the guide 33 excluding the rear end portion is the male screw portion 33a, and the rear end portion projects rearward of the connecting portion 31b.

As shown in FIGS. 2 and 3, the rear end portion of the guide 33 has a larger diameter than the front male screw portion 33a, the outer peripheral surface thereof is hexagonal, and the vicinity of the rear end surface thereof gradually becomes rearward. The tapered guide portion 33b has a reduced diameter. The guide portion 33b is fitted in the guide portion 24b provided in the fastener 24 of the inner surface regulation tool 20.

A bolt 34 is attached to the male screw portion 33a of the guide 33 at right angles to the center of the guide 33. The head of bolt 34 and nut 35 are
In order not to interfere with the screwing of 3a, the male screw portion 33
It is embedded in a.

The wire 41 of the puller collecting and holding means 4 is stretched outside the support rod 10 over its entire length,
The tip portion is introduced into the shank 21 through the wire passage hole 21 provided in the shank 21 of the inner surface regulation tool 20,
Further, it passes through the inside of the connecting tool 22 and is drawn out to the front of the inner surface restricting tool 20 and connected to the bolt 34.

On the other hand, the rear end portion of the wire 41 has a support rod 1
0 is connected to a winch arranged on the rear end side. When the wire 41 is loosened, the pull tab 30 is in a free state and is separated from the inner surface regulation tool 20, and when the wire 41 is wound by a winch, the pull tab 30 is retracted and the guide portion 33b is moved to the guide portion 24b of the inner surface regulation tool 20. Fit inside. Then, the pull tab 30 is concentrically held by the tip of the inner surface regulation tool 20 in a completely fitted state.

FIG. 4 is a side view showing the overall structure of a pipe drawing apparatus embodying the present invention.

The pipe drawing device is of a triple type in which three drawing positions are arranged in parallel, and the support rod 10 is provided on the entrance side of the die 50.
The support driving mechanism 60 is provided, and the drawing machine 70 is provided on the exit side.

As shown in FIG. 5, the support driving mechanism 60 of the support rod 10 has a so-called revolver structure in which a plurality of guide tubes 62 are provided around a drum 61 which is rotated in the circumferential direction. Support rod 10 inserted into
Are simultaneously moved from the upper three raw tube insertion positions to the lower three drawing positions by three at a time.

A pair of upper and lower bases 63, 63 are attached to the rear end of the drum 61. Each base 63 moves forward and backward along the guide rod 65 using the cylinder 64 as a drive source, thereby simultaneously driving the three support rods 10 in the axial direction. As shown in FIG. 6, the rear ends of the three support rods 10 are connected to each of the bases 63, and the support rods 10 are connected to each other.
The winch 42 of the puller collecting and holding means 40 is attached corresponding to the above.

The winch 42 has a well-known structure in which a drum is rotated by a motor, and the wire 41 is wound around the drum. A clutch and a brake are provided between the drum and the motor. When the clutch is disengaged and the brake is removed, the drum is free and the wire 4
Allows one free withdrawal. The wire 41 passes through the guide tube 62 together with the support rod 10.

The drawing machine 70 has a carriage 72 that moves forward and backward on a bed 71. The carriage 72 is driven by a chain 73 and is equipped with a gripper 74 at the end on the die side. Three grippers 74 are arranged in parallel corresponding to the three drawing positions, and each of them is a head 31a of the puller 30.
To grip. A plurality of pipe supports 75 are provided on the bed 71. When the carriage 72 arrives, each tube receiver 75 rotates in the horizontal plane to retract from the drawing position, and when the carriage 72 returns to the original position, it returns to the drawing position by the spring.

A guide gutter 80 for guiding the pull tab 30 from the bed 71 to the die 50 is arranged between the die 50 and the bed 71 of the drawing machine 70. As shown in FIG. 7, the guide gutter 80 has three U-shaped receiving surfaces 81 corresponding to three drawing positions, and is lifted and lowered to three positions of upper, middle, and lower by a lifting device using a cylinder 82. To be done. In the upper position, the receiving surface 81 of the guide gutter 80 is substantially level with the lower surface of the die hole, and in the middle level, the receiving surface 81 is substantially level with the upper surface of the tube receiver 75 that supports the pipe after drawing. Further, at a lower position, the height is such that the guide gutter 80 does not interfere with the carriage 72 when the carriage 72 approaches the die 50.

Next, how to use the tube drawing device will be described.

The guide tube 62 is located on the upper side of the drum 10 at the tube insertion position and on the lower side at the drawing position.

At the base tube insertion position, the base 63 is initially in the retracted limit. Puller 30 uses wire 41 to winch 4
The winch 42 is pulled by 2 and fixed by a brake, so that the winch 42 is concentrically connected and held to the tip of the inner surface regulation tool 20. Then, in this state, the raw tube 90 is inserted into the guide tube 62 from the front. The raw pipe 90 is fitted onto the support rod 10, and the tip portion thereof projects forward of the guide tube 62, and the inner surface regulation tool 20 and the pull tab 30 are set therein.

When the raw pipe 90 is inserted into the guide tube 62, the drum 61 is rotated to move the raw pipe 90 to the drawing position.

In the drawing position, first, the base 63 moves forward.
As a result, the support rod 10 is moved forward, and the mouthpiece of the raw tube 90 is pushed forward by the locking tool 32 of the pull tab 30. As a result, the mouthpiece portion is inserted into the die hole using the guide portion itself as a guide and is centered. The head 31 a of the pull tab 30 passes through the inside of the mouth portion and projects toward the front of the die 50.

Next, with the base 63 being biased toward the die 50, that is, with the mouthpiece being pressed against the die 50, the carriage 72 moves toward the die 50 and the gripper 74 moves the head of the puller 30. Grab 31a. At this time, the guide gutter 80 is in the lower position, and the tube receiver 75 retracts in the horizontal plane as the carriage 72 approaches.

When the pull tab 30 is connected to the gripper 74, the brake of the winch 42 is released, the clutch is disengaged, and the drum is freed, so that the carriage 72 is moved to the side opposite to the die. Since the base 63 is biased toward the die 50, the plug 25 of the inner surface regulation tool 20 is pushed to a regular position in the die hole with the movement of the carriage 72, and drawing is started.

When the carriage 72 passes above the guide gutter 80, the guide gutter 80 is raised to the middle position. Further, the tube receiver 75 sequentially returns to the tube receiving position as the carriage 72 passes. When the rear end of the raw pipe 90 comes out of the die 50, the head 31a of the pull tab 30 separates from the gripper 74 by the reaction, and the drawn pipe that comes out of the die 50 is supported by the pipe receiver 75.

When the drawing is completed in this way, the winch 42
The clutch is inserted and the motor is driven to wind up the wire 41. As a result, the pull tab 30 moves in the drawn pipe to the die 50 side, is discharged from the pipe, and is placed on the guide gutter 80. When the pull tab 30 is placed on the guide gutter 80, the winch 4
The motor of No. 2 is stopped temporarily, and the guide gutter 80 is raised to the upper level. Then, drive the winch 42 motor again,
The pull tab 30 is connected to the tip of the inner surface regulation tool 20.

When the pull tab 30 is held at the tip of the inner surface regulation tool 20, the winch 42 is braked and the motor is stopped. Next, the base 63 is moved to the side opposite to the die, and the support rod 10 is retracted to its original position. As a result, the plug 25 is pulled out from the die hole. Also, puller 30
Returns to the side of the support drive mechanism 60 through the die hole.

While the pull tab 30 is collected and held again at the drawing position, the guide tube 62 is placed at the blank tube insertion position.
A blank tube 90 is set inside.

Although the guide portion 33a of the guide 33 of the pull tab 30 is hexagonal in the above embodiment, it may be polygonal or circular other than this.

The guide gutter 80 can be omitted in a drawing machine having a structure in which the drawn tube is held at the center of the die.

The wire 41 passes through the outside of the support rod 10 in the above embodiment, but a through hole reaching the rear end is provided in the axial center portion of the support rod 10 so that the wire 41 can pass through it. You may

[0050]

As is clear from the above description, the pipe drawing apparatus of the present invention automatically collects and sets the puller, so that the labor can be omitted. In particular, the puller is not integrated with the drawing machine, and the puller of a general type separated from the drawing machine is held at the tip of the inner surface regulation tool by pulling with a wire, so that the structure of the puller is simple and durable. Therefore, there are few failures, and the drawing force is not limited.
Also, when drawing, as in the case of a puller of a general type, since it is inserted into the tube from the rear of the tube and is locked to the mouthpiece of the tube, the center of the tube is drawn into the die hole before drawing. Since it is not necessary to match the center, it is possible to avoid the decrease in efficiency and the increase in equipment cost due to the addition of equipment.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a main part of a pipe drawing device embodying the present invention.

FIG. 2 is a side view of a puller guide.

FIG. 3 is a view taken along the line AA of FIG.

FIG. 4 is a side view showing the overall structure of a pipe drawing device embodying the present invention.

5 is a view taken along the line BB of FIG.

FIG. 6 is a view taken along the line CC of FIG.

7 is a view taken along the line DD of FIG.

FIG. 8 is an explanatory diagram of a pulling method.

FIG. 9 is an explanatory diagram of a conventional tube drawing device that does not require the collection of pullers.

[Explanation of symbols]

 10 Support Rod 20 Inner Surface Control Tool 30 Puller 33 Guide 40 Puller Recovery and Holding Means 41 Wire 42 Winch 50 Die 60 Support Drive Mechanism of Support Rod 10 70 Drawer 80 Guide Gutter of Puller 30

Claims (1)

[Claims] 1. A puller-type tube drawing device, wherein a tubular inner surface restricting tool that is attached to a tip of a support rod and holds a ring-shaped plug inside a die, and a tip end portion of the inner surface restricting tool. It has a centering guide for mating at the center of the rear end, the rear end of which is locked in the mouth of the base pipe while passing through the die, and the tip of which passes through the mouth of the base pipe. A puller that protrudes forward, is stretched along the support rod, and a tip portion of the puller passes through at least the inside of the plug of the inner surface restricting tool and is pulled out toward the front of the inner surface restricting tool. The puller has a wire connected to the end, and pulls the wire backward to collect the puller on the inner surface regulating tool side, and also connects and holds the collected puller to the tip of the inner surface regulating tool. And a pipe drawing apparatus comprising: Place