JPH0929324A - Support method for plug rod in tube stock drawing device and support structure for plug rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a plug rod from deflecting while progressing drawing by sequentially detaching plural rod receiving members one by one from a clamp carriage every time a tube stock is drawn by a prescribed length. SOLUTION: A plug 10 is set in the inside of stock tube 4, the tip end part of tube stock 4 is chucked with a chuck 6b and is pulled to left direction through a die 6. The rear end part of tube stock 4 is held with a clamp 50. Plural rod receiving members 7 are arranged at back of a clamp carriage 5. When drawing of tube stock 4 is started, the clamp carriage 5 is run in the drawing direction. A pulling member 8 arranged to the carriage 5 moves the receiving member 7 through a projecting part 74 of receiving member 7. When a follower cam member 81 of pulling member 8 is brought into contact with a cam member 9, the pulling member 8 is turned to be displaced upward. A hook part 80 of pulling member 8 is disengaged from the projecting part 74 of receiving member 7. Thus, the receiving member 7 is detached from the carriage 5 and supports a rod 1 at this position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a method of supporting a plug rod in a pipe drawing apparatus and a supporting structure. More specifically, the rear end of the plug rod having the plug at the front end is held by the holding device,
The rear end portion of the raw pipe is held by the clamp of the clamp carriage that runs along the drawing direction of the raw pipe, and the plug inserted into the front end portion of the raw pipe and the die positioned on the outer circumference of the raw pipe. The present invention relates to a supporting method and a supporting structure for supporting the plug rod so as not to bend during drawing in a tube material drawing device which presses between the tube and draws out the raw tube.

[0002]

2. Description of the Related Art In a pulling device of this type, if there is no means for supporting the plug rod during pulling, the central portion of the plug rod bends downward during pulling of the pipe material, and this bending causes the plug to move upward. Is applied, it causes uneven thickness, bending, and poor roundness of the drawn product. This tendency becomes remarkable when a thin tube having a relatively large diameter is manufactured.

One of the conventional means for supporting the plug rod so as not to bend during pulling is, for example, Japanese Patent Laid-Open No. 61-25.
8308 and Japanese Patent Laid-Open No. 2-63606. The supporting means disclosed in Japanese Patent Laid-Open No. 61-258308 will be described with reference to FIG.

The plug rod 1 has a plug 1 at the tip thereof.
0 is attached, and its rear end is held by a holding device 3 installed at the rear end of the back bench 2. After being supplied from the left in the figure, the raw pipe 4 is held in a state of being clamped from both sides by the clamps 50 of the clamp carriage 5 which runs along the back bench 2. By moving the clamp carriage 5 to the right in the figure,
The plug 10 is set in the tube 4 with the plug 10 inserted at the tip. In this set state, the back bench 2 is moved to the front of the drawing bench main body (not shown), and then the holding device 3 is moved slightly to the left in the drawing, and the tip of the raw pipe 4 is installed on the drawing bench main body side. Set it in the die 6,
The element tube 4 is pulled out by chucking the element tube 4 and pulling it to the left in the figure. A rod receiving roller 60 is attached to the clamp carriage 5, so that the plug rod 1 is supported substantially horizontally at the portion of the rod receiving roller 60 during withdrawal of the raw tube 4. JP-A-2-
In the means of Japanese Patent No. 63606, a member for holding the plug rod 1 is installed on the clamp carriage 5 instead of the receiving roller 60.

As another means for supporting the plug rod so as not to bend during extraction, as shown in FIG. 9, for example, the actuators 6 are arranged below the plug rod 1 at predetermined intervals.
It is proposed that each rod receiving roller 62 that moves up and down by 1 is installed. The means shown in FIG. 9 is configured such that each time the raw tube 4 is pulled out to the left in the figure by a predetermined length, the upper sensor 6
3, a predetermined position (not shown) of the clamp carriage 5 is detected, and the rod receiving roller 62 is sequentially raised by the operation of the actuator 61 in accordance with this detection so that the plug rod 1 is supported horizontally. ing.
The other structure is almost the same as that of the apparatus shown in FIG.

[0006]

The above-mentioned conventional means have the following problems, respectively. According to the means shown in FIG. 8, the plug rod 1 bends as shown by the chain double-dashed line in the figure as the drawing length of the raw pipe 4 increases as shown in the figure, so that the above-mentioned problem is sufficiently improved. I can't. According to the means shown in FIG. 9, when the rod receiving roller 62 pushed up by the actuator 61 contacts the plug rod 1, the element pipe 4 is vibrated through the plug rod 1 and the plug 10, and this vibration causes There are problems such as uneven thickness in the drawn product, or a striped pattern on the product surface. An object of the present invention is to provide a method of supporting a plug rod in which the plug rod is supported so as not to bend during drawing of the raw pipe and which does not give vibration to the raw pipe, and a supporting structure thereof. .

[0007]

In order to solve the above-mentioned problems, the supporting method according to the present invention is arranged such that the rear end of a plug rod having a plug at its tip is held by a holding device and travels along the drawing direction of the raw pipe. The rear end of the raw pipe is held by the clamp of the clamp carriage, and the raw pipe is pulled out by pressing between the plug inserted in the front end of the raw pipe and the die located on the outer periphery of the raw pipe. In a pipe drawing apparatus, before pulling out the raw pipe, it travels to the rear of the clamp carriage along the pulling direction of the raw pipe, following the clamp carriage, and supporting the plug rod in a non-deflecting state. Arranging a plurality of rod receiving members side by side along the drawing direction of the raw pipe, and pulling the raw pipe by a predetermined length while pulling the raw pipe, Is characterized by comprising the step of disconnecting the order from the de receiving member one by one said clamp carriage.

In order to solve the above-mentioned problems, the support structure according to the present invention has a back bench, a holding device installed at the rear end of the back bench, and a plug having a plug at the front end and the back end having the holding device. And a clamp carriage that runs along the back bench and holds the rear end of the tube, and runs freely on the back bench along the running direction of the clamp carriage. And a plurality of rod receiving members that support the plug rod in a non-deflectable state, a pulling member that is installed on the clamp carriage in a state of swinging in a certain range in the vertical direction, and a traveling portion of the rod receiving member. Each of the rod receiving portions is provided so as to project laterally of the rod receiving portion at a predetermined interval, and includes at least one cam member less than the number of the rod receiving members. A convex portion is formed on the pulling member, and the pulling member includes a hook portion that is locked to the convex portion of the rod receiving member when the clamp carriage travels in the pull-out direction of the tube, and the cam members. It is characterized in that it has a follower cam member which is provided so that the hook portion is disengaged from the convex portion when contacting. It is preferable that the follower cam member is further configured to be caught by the protrusion only when the clamp carriage travels in a direction opposite to the pulling-out direction of the raw pipe.

According to the plug rod support method of the present invention, one rod receiving member that follows the clamp carriage is drawn each time the raw pipe is pulled out by a predetermined length while pulling out the raw pipe. Since the clamp carriages are separated from each other one by one, the rod receiving members are arranged at predetermined intervals in a state of supporting the plug rods in a non-deflecting state during the pulling process. Therefore, the plug rod is supported so as not to bend as a whole during extraction. Further, since the rod receiving member is in contact with the plug rod before the start of drawing, the rod is hardly vibrated.

According to the plug rod support structure of the present invention, the raw pipe is set in a retractable state, and the hook portion of the pulling member is locked to the convex portion of the rod receiving member at the rearmost portion. Then, the drawing of the raw tube is started. When the clamp carriage travels in the drawing direction along with the drawing of the raw pipe, all rod receiving members also follow the clamp carriage and travel in the drawing direction. When the element pipe is pulled out by a predetermined length and the pulling member passes the position of the cam, the follower cam member of the rearmost rod receiving member contacts the cam, and the convex portion of the rod receiving member is By being disengaged from the cam, the rod receiving member is separated from the clamp carriage and stops at that position. Similarly, each time the pull-out length of the raw pipe reaches a predetermined length, the rod receiving members are separated from the clamp carriage one by one, so that the plug rods are bent by the respective rod receiving members at predetermined intervals. It will be in a state of being supported in a state where it does not come out.

The plug is guided to the rear end of the base pipe (the rear end in the drawing direction), the base pipe is held by the clamp of the clamp carriage and moved toward the rear end of the back bench, When the plug is inserted, the rod receiving members are pushed by the clamp carriage and move toward the rear end of the back bench, and are aligned in the rearward direction of the clamp carriage along the pull-out direction of the raw pipe. At this time, every time the follower cam member of the pulling member comes into contact with the cam, the hook portion of the pulling member moves the convex portion of the rod receiving member in the reverse direction (reverse direction of the drawing direction of the raw pipe). Since it exceeds, the hook portion of the pulling member is finally locked to the projection of the rearmost rod receiving member in the pulling direction.

In the plug rod supporting method and supporting structure according to the present invention, the number of rod receiving members and the interval at which the rod receiving members are sequentially separated from the clamp carriage in the process of withdrawing are determined by the withdrawal length of the tube. It is determined according to the diameter and material of the plug rod. If the drawing length of the raw pipe is long, increase the number. If the diameter of the plug rod is small, or if the plug rod is liable to bend due to its material, the number of the plug rods is increased and the separation distance is reduced.

In the present invention, a cushioning material having a cushioning property such as rubber or sponge is used in a portion of the rod receiving member that comes into contact with the plug rod, and the hook portion of the pulling member has It is preferable to configure so as to absorb the impact when it comes off the convex portion as much as possible. Further, it is preferable to use a low friction member, a roller or the like for the follower cam member so that the impact when the follower cam member of the pulling member gets over the cam is as small as possible. It is preferable that the cam is configured so that the corresponding portion gently protrudes upward and has a guide rail shape as a whole. Further, it is desirable that each rod receiving member is configured to be driven by wheels along a rail-shaped guide provided on an upper portion of the back bench so that the rod receiving member can travel reliably and smoothly along the drawing direction of the raw pipe.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Referring to FIGS.
A preferred embodiment of the plug rod supporting method and supporting structure according to the present invention will be described. Embodiment-1 FIGS. 1 to 4 show Embodiment-1 of the method and structure according to the present invention. FIG. 1 is a partial cross-sectional view of a pipe material drawing apparatus using a plug rod support structure of an embodiment according to the present invention, FIG. 2 is an enlarged cross-sectional view taken along the arrow AA of FIG.
FIG. 4 is a partial cross-sectional view showing a state where the raw pipe is pulled out from the state shown in FIG. 1 by a predetermined length, and FIG.

A plug rod 1 is installed on the back bench 2 so as to extend in the pulling direction of the raw pipe 4. The plug rod 1 is held at its rear end by a holding member 3 installed at the rear end of the back bench 2 so as to be swingable in the vertical direction, and protrudes forward from the front end of the back bench 2. A plug 10 is attached to the tip of the plug 10.

The clamp carriage 5 is a back bench 2
The clamp 50 is installed on the upper part so as to run along the drawing direction, and a clamp 50 for clamping and holding the rear end part of the raw pipe 4 in the drawing direction is provided at the tip part thereof. The clamp carriage 5 of this embodiment, as shown in FIG.
It is mainly composed of an upper horizontal frame 51 and vertical frames 52 attached to lower portions on both sides of the horizontal frame 51. On the back bench 2 whose cross section is almost H-shaped,
Rails 21 and 21 are fixed inside the upper side walls 20 and 20, respectively, and the clamp carriage 5 includes a plurality of wheels 5 mounted on the vertical frames 52.
3, 53 are configured to roll on the rails 21 and 21, respectively, and run along the rails 21 and 21.

The rollers 55 attached to the front and rear ends on both sides of the horizontal frame 51 by the shafts 54 are brought into contact with the insides of the rails 21 and the side walls 2 are formed.
By bringing the multiple guide rollers 22 installed inside 0, 20 into contact with the respective wheels 53, the clamp carriage 5 can travel in a state of not swinging to the left or right or up and down. Clamp carriage 5 of this embodiment
Runs in the right direction in FIG. 1 by a drive mechanism (not shown), and runs in the left direction in FIG. 1 following the pulling out of the raw pipe 4. The clamp 50 is omitted in FIG. 4 for convenience.

Back bench 2 in the apparatus of this embodiment
First has moved laterally from the position in series with the drawing bench body 6a in FIG. At the side position, the raw pipe 4 is fed so that the plug 10 is guided into the raw pipe 4, the clamp 50 holds the rear end of the raw pipe 4, and the clamp carriage 5 moves the rear end of the back bench 2. Direction (the right direction in FIG. 1), the plug 10
Is set inside the tip of the tube 4. in this way,
If the plug 10 is set inside the tip portion of the raw pipe 4, the back bench 2 is moved so as to coincide with the rear side of the drawing bench main body 6a, and then the holding device 3 is moved slightly toward the drawing bench main body 6a. Then, the tip of the raw pipe 4 is pulled out and set in the die 6 of the bench main body 6a. In this set state, the tip end of the raw tube 4 is chucked by the chuck 6b and pulled to the left in FIG. 1, so that the raw tube 4 is pulled out.

As shown in FIGS. 1 and 2, on the insole 23 of the back bench 2, behind the clamp carriage 5, three rods freely traveling along the length direction of the back bench 2. The receiving members 7 are arranged side by side in a row. Each rod receiving member 7 of this embodiment has a traveling platform 70 having wheels 73 near the corners on both sides and a traveling platform 70.
And a receiving member 71 fixed on the upper part of the back bench 2, and is configured to travel along a pair of rail-shaped guides 24, 24 laid on the insole 23 of the back bench 2.
The receiving member 7 that supports the plug rod 1 in a substantially horizontal state.
In the upper part of 1, the part that contacts the plug rod 1,
A cushioning material 72 having a soft cushioning property such as sponge and rubber is attached.

Horizontal frame 51 of clamp carriage 5
Brackets 56, 56 mounted so as to hang down
Each of the pulling members 8 is attached to the rod receiving member 7 in a state of swinging in the vertical direction on both sides of the receiving member 71. Each pulling member 8 is a pin-shaped stopper 5 of FIG.
7 prevents it from dropping below the state shown in FIG. On the other hand, the protrusions 74,
74 is provided, and when the traveling platform 70 travels in the pull-out direction, the convex portion 74 and the hook portion 80 projecting to the lower rear end of the pulling member 8 are locked (at first, FIG. 1). The hook portion 80 is hooked on the convex portion 74 of the rightmost rod receiving member 7) so that each rod receiving member 7 travels following the clamp carriage 5 via the pulling member 8. There is.

On the insole 23 of the back bench 2, cam members 9 are provided on both sides of the traveling portion of the rod receiving member 7 at predetermined intervals along the length direction of the back bench 2. Then, when the follower cam member 81 protruding to the lower side of the pulling member 8 comes into contact with the cam member 9 while the traveling platform 70 is running, the pulling member 8 rotates and is displaced upward. As a result, the hook portion 80 of the pulling member 8 is disengaged from the convex portion 74 of the rod receiving member 7, and the rod receiving member 7 is separated from the clamp carriage 5. Although the number of cam members 9 installed in this embodiment is one less than the number of rod receiving members 7, both may be the same.

In the drawing apparatus of this embodiment, the raw pipe 4
When the clamp 50 holds the rear end portion of the back carriage 2 and the clamp carriage 5 travels in the rear end direction of the back bench 2, the rod receiving members 7 are pushed by the clamp carriage 5 and the bench 2 moves.
After moving to the rear end direction, finally, as shown in FIG. 1, the rod receiving members 7 are arranged in a line on the rear end portion of the back bench 2. Further, since the hook portion 80 of the pulling member 8 successively overhangs the convex portion 74 of each rod receiving member 7, the hook portion 80 of the pulling member 8 is pulled to the convex portion 74 of the rod receiving member 7 at the rearmost portion in the pulling direction of the raw pipe. It will be locked against the. Therefore, when the drawing of the raw pipe 4 is started in the state of FIG.
Each rod receiving member 7 follows the clamp carriage 7 as it runs along the pull-out direction.

When the clamp carriage 5 further travels in the pulling-out direction as the pulling-out of the raw pipe 4 progresses, the follower cam member 81 of the pulling member 8 comes into contact with the rearmost cam member 9 as shown in FIG. When the hook portion 80 of the member 8 is disengaged from the convex portion 74 of the rod receiving member 7 at the rearmost portion, the rod receiving member 7 is separated from the clamp carriage 5. The rod receiving member 7 is the back bench 2
Will be left in that position. The rod receiving members 7 are sequentially separated from the clamp carriage 5 by a similar action as the raw tube 4 is pulled out.

Therefore, the plug rod 1 is almost at a predetermined interval by the rod receiving members 7 sequentially left on the insole 23 of the back bench 2 at the stage when the drawing out of the raw pipe 4 is completed as shown in FIG. Since it is supported horizontally, it does not bend as the drawing of the raw tube 4 progresses, uneven thickness of the drawn product can be prevented, and higher roundness of the product can be secured. You can Further, since the rod receiving member 7 is in contact with the plug rod 1 from the beginning and is not in the structure of contacting the plug rod 1 from the middle, vibration of the plug rod 1 during pulling is smaller, and therefore a striped pattern appears on the surface of the pulled product. Nothing.

Embodiment-2 FIG. 5 shows another embodiment of the plug rod support structure. In the support structure of this embodiment, the cam members 9 are formed on the upper portion of the guide rail 90 at predetermined intervals, and are installed on the guide rail 90 so as to project to the lower side of the pulling member 8. Roller-shaped follower cam member 81
Are in contact. Stopper 5 in the structure of Example-1
7 is not provided. In the support structure of this embodiment, the contact of the follower cam member 81 with the cam member 9 and the guide rail 90 is rolling contact, so the vibration of the plug rod 1 during pulling is further smaller. Other configurations, operations, and effects of the support structure of this embodiment are substantially the same as those of the first embodiment, and therefore the description thereof will be omitted.

Embodiment-3 FIG. 6 shows still another embodiment of the plug rod support structure. In this embodiment, the receiving tool 71 for receiving the plug rod 1 is composed of a roller rotatably supported by a supporting piece 75 on the traveling table 70, and the roller is formed of rubber or synthetic resin having elasticity. Has been done. In the support structure of this embodiment, since the plug rod 1 and the receiving member 71 are in rolling contact with each other, the vibration of the plug rod 1 during pulling is smaller. Other configurations, operations, and effects of the support structure of this embodiment are substantially the same as those of the first and second embodiments, and therefore the description thereof will be omitted.

Embodiment-4 FIG. 7 shows still another embodiment of the plug rod support structure. This embodiment is a modification of the rod receiving member 7, in which nuts 77 are attached near the corners of the upper portion of the receiving member 71, and bearings 76 are provided on the upper surface of the traveling platform 70 at positions corresponding to the nuts 77. Each bolt 78 is attached through each nut 77, and each nut 77 is attached to the corresponding bolt 78.
It is screwed in. Rod receiving member 7 of this embodiment
Can pinch the butterfly-shaped piece 79 of the head of the bolt 78 and rotate the bolt 78 to jack up or jack down the receiver 71 to finely adjust the height of the receiver 71. Other configurations, operations, and effects of the support structure of this embodiment are substantially the same as those of the first and second embodiments, and therefore the description thereof will be omitted.

The present invention can also be implemented when the surface of the plug 10 is not smooth and has a groove along the axial direction or a spiral groove inclined with respect to the axial direction on the surface. When the surface of the plug 10 has a spiral groove,
The plug 10 is rotatably attached to the plug rod 1.

[0029]

According to the plug rod supporting method of the present invention, rod receiving members that travel along the clamp carriage along the pull-out direction of the tube are arranged in a row behind the clamp carriage. , While pulling out the raw pipe, each time the raw pipe is pulled out by a predetermined length, the plurality of rod receiving members are separated one by one from the clamp carriage, so that the plug rods are substantially horizontal at predetermined intervals by the rod receiving members. Will be supported by.
Therefore, since the plug rod does not bend as the drawing progresses, it is possible to prevent uneven thickness of the drawn product and decrease in roundness. In addition, since the multiple rod receiving members are in contact with the plug rods from the beginning of drawing and are not in contact with the plug rods halfway, the tube does not vibrate during drawing and a striped pattern appears on the surface of the drawn product. Therefore, it is possible to prevent the roundness from being lowered due to the vibration.

According to the plug rod support structure of the present invention, a plurality of rod receiving members are provided so as to be arranged in a row rearward of the clamp carriage, and the pulling member is vertically swung in the clamp carriage within a certain range. Since the cam member for disconnecting the rod receiving member from the pulling member is provided as the clamp carriage travels in the pulling-out direction, the supporting method can be smoothly performed.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a pipe material drawing device using a plug rod support structure of an embodiment according to the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the arrow AA of FIG.

FIG. 3 is a partial cross-sectional view of the drawing device of FIG. 1 in a state where a raw pipe is drawn out by a predetermined length from the state of FIG.

FIG. 4 is a partial cross-sectional view of the drawing apparatus of FIG. 3 in a state in which the raw pipe is further drawn from the state of FIG.

FIG. 5 is a partial cross-sectional view of a pipe drawing apparatus using a plug rod support structure of another embodiment according to the present invention.

FIG. 6 is a front view showing a modified example of a rod receiving member.

FIG. 7 is a front view showing another modification of the rod receiving member.

FIG. 8 is a partial cross-sectional view showing an example of a conventional plug rod support structure.

FIG. 9 is a partial cross-sectional view showing another example of the conventional plug rod support structure.

[Explanation of symbols]

 1 Plug Rod 10 Plug 2 Back Bench 20 Side Wall 21 Rail 22 Roller 23 Middle Bottom 24 Rail-shaped Guide 3 Holding Device 4 Element Pipe 5 Clamp Carriage 50 Clamp 51 Horizontal Frame 52 Vertical Frame 53 Wheel 54 Shaft 55 Roller 56 Bracket 57 Stopper 6 Dice 60, 62 Rod receiving roller 61 Actuator 63 Sensor 6a Drawing die body 6b Chuck 7 Rod receiving member 70 Traveling platform 71 Receiver 72 Buffer material 73 Wheel 74 Convex portion 75 Supporting piece 76 Bearing 77 Nut 78 Bolt 79 Butterfly portion 8 Traction member 80 Hook part 81 Follower cam member 9 Cam member 90 Guide rail

Claims (2)

[Claims] 1. A rear end of a plug rod having a plug at its front end is held by a holding device, and a rear end portion of the raw pipe is held by a clamp of a clamp carriage which runs along a drawing direction of the raw pipe. In a tubing material drawing device that draws the raw material pipe by compressing between the plug inserted into the tip portion of the pipe and a die located on the outer circumference of the raw material pipe, before the raw material pipe is pulled out, the rear of the clamp carriage A plurality of rod receiving members, which run along the drawing direction of the raw pipe and follow the clamp carriage and support the plug rod in a non-deflected state, are arranged side by side along the pulling direction of the raw pipe. A step of separating the rod receiving members one by one from the clamp carriage each time the raw tube is pulled out by a predetermined length while pulling out the raw tube. Characterized in that it comprises bets, supporting methods of the plug rod in tube pulling apparatus. 2. A backbench, a holding device installed at a rear end portion of the backbench, a plug rod having a plug at a front end portion and a rear end portion held by the holding device, and the backbench. A clamp carriage having a clamp for holding the rear end portion of the raw pipe, which travels along the traveling direction, and freely travels on the back bench in the traveling direction of the clamp carriage and does not bend the plug rod. A plurality of rod receiving members to support, a pulling member installed on the clamp carriage in a state of swinging in a certain range in the vertical direction, and a state of protruding to a side of a traveling portion of the rod receiving member at a predetermined interval. A cam member that is installed and at least one less than the number of rod receiving members, each rod receiving member has a convex portion, and each pulling member has And a hook portion that is locked to the convex portion of the rod receiving member when the sample carriage travels in the pull-out direction of the raw pipe, and a state where the hook portion is disengaged from the convex portion when contacting each cam member. A support structure for a plug rod in a pipe material drawing device, comprising: a follower cam member provided.