JP2023028687A - Expanded tube thinning drawing device and expanded tube thinning drawing method using the same - Google Patents

Abstract

To provide an expanded tube thinning drawing device which enable reuses of a mouth even after second drawing.SOLUTION: An expanded tube thinning drawing device 10 comprises: a die bearing 2a for reducing the thickness of a header 1; a drawing plug 5 having a taper for increasing the diameter of the tube end of the header 1; a plug clamp 6 for fitting the drawing plug 5 to the end of a core metal 4 inserted into the header 1; a stopper 8 for stopping the header 1 so as not to move during expanded tube molding of the tube end of the header 1; a core metal cylinder 7 for moving the core metal 4 along the drawing direction so as to expand the tube end of the header 1 to form a mouth 1a by using the drawing plug 5 and the die bearing 2a; and a carriage 10 having a square or higher order polygonal chucking structure capable of gripping the tube-expanded mouth 1a and maintaining a shape without changing the shape of the mouth 1a by a pulling-out force.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a tube expansion drawing apparatus and a tube expansion drawing method using the tube expansion drawing apparatus.

Conventionally, an apparatus has been developed in which the end portion of a mother pipe such as titanium or Zircaloy is expanded through a plug bearing or the like to form a mouth portion, and the mouth portion is gripped by a carriage to draw the mother pipe.

As a technique related to the present invention, for example, Patent Document 1 discloses a method for manufacturing an ultra-thin metal pipe using a drawing machine, in which the diameter gradually expands or contracts from the biting inlet side toward the finishing outlet side. A blank pipe with one end widened is inserted into the solid die, and a plug or taper mandrel whose diameter gradually expands from the inlet side of the die to the finishing outlet side is inserted into the blank pipe. Then, by gripping the widened portion with a chuck and pulling out the blank pipe in the direction from the biting inlet side to the finishing outlet side, the outer diameter and A method for manufacturing an ultra-thin metal pipe by cold drawing is disclosed, which is characterized in that the thickness is reduced while the diameter at the center of the thickness, which is the average value of the inner diameter, is increased while the pipe is drawn.

International Publication No. 2009/096034

Since the conventional carriage was clamped by the claws and was subjected to a pulling force, the opening of the cylindrical shape was deformed into a substantially elliptical shape. Therefore, when performing the second drawing, it is necessary to separate and use the collapsed mouth, which is wasteful.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tube expansion drawing apparatus and a tube expansion drawing method using the tube expansion drawing apparatus that enables reuse of the mouth portion even after the second drawing.

A pipe expanding underlay drawing device according to the present invention has an insertion opening for inserting a cylindrical mother pipe, a die bearing portion for reducing the wall thickness of the mother pipe, and a pipe end portion of the mother pipe. a drawn plug portion having a taper for increasing the diameter of the main pipe; a plug clamp portion for attaching the drawn plug portion to the end of the core metal inserted into the mother pipe; and the pipe of the mother pipe. A stopper portion for stopping the mother pipe from moving when the end portion is expanded, and a mouth portion by expanding the pipe end portion of the mother pipe using the drawing plug portion and the die bearing portion. and a cored bar cylinder part that moves the cored bar along the drawing direction so as to form a square or more shape that can hold the expanded mouth part and maintain the shape without changing the shape of the mouth part by a pulling force. and a carriage portion having a polygonal chucking structure.

Further, in the pipe expanding underlay drawing device according to the present invention, it is preferable that the attachment/detachment structure between the drawing plug portion and the core metal is a bayonet structure or a horseshoe structure.

A tube expansion underdrawing method according to the present invention includes an insertion opening for inserting a cylindrical mother pipe, a die bearing portion for reducing the thickness of the mother pipe, and a pipe end portion of the mother pipe. a drawn plug portion having a taper for increasing the diameter of the main pipe; a plug clamp portion for attaching the drawn plug portion to the end of the core metal inserted into the mother pipe; and the pipe of the mother pipe. A stopper portion for stopping the mother pipe from moving when the end portion is expanded, and a mouth portion by expanding the pipe end portion of the mother pipe using the drawing plug portion and the die bearing portion. and a cored bar cylinder part that moves the cored bar along the drawing direction so as to form a square or more shape that can hold the expanded mouth part and maintain the shape without changing the shape of the mouth part by a pulling force. A tube expansion drawing and drawing method using a tube expansion and drawing device comprising a carriage portion having a polygonal chucking structure, wherein a first step of setting the mother pipe in the tube expansion and drawing device; After the first step, a second step of attaching the drawing plug portion to the end portion of the mandrel, and after the second step, the mandrel is drawn in the drawing direction by the mandrel cylinder portion. a third step of moving to the retreat side along and expanding the pipe end portion of the mother pipe to form the mouth; after the third step, grasping the mouth with the carriage; and a fourth step of moving the carriage toward the forward side in the drawing direction to reduce the thickness of the mother pipe.

Further, in the tube expansion underlay drawing method according to the present invention, after the fourth step, a fifth step of stopping or decelerating the carriage portion and then moving the drawing plug portion to the retreating side; After step 5, it is preferable to include a sixth step of moving the carriage portion to the forward side so as to release the thinned drawn pipe from the die bearing portion.

According to the present invention, the mouth can be reused after the second drawing.

It is a figure which shows a mode that drawing is performed using the pipe-expansion undercut drawing apparatus of embodiment which concerns on this invention. It is a figure which shows a mode that drawing is performed using the pipe-expansion undercut drawing apparatus of embodiment which concerns on this invention. It is a figure which shows the drawing plug part and carriage part of the pipe expansion underlay drawing apparatus of embodiment which concerns on this invention. It is a figure explaining the drawing method of a prior art.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. In the following, the same reference numerals are given to the same elements in all the drawings, and redundant explanations are omitted. Also, in the explanation in the text, the reference numerals mentioned before are used as necessary.

FIG.1 and FIG.2 is a figure which shows a mode that drawing is performed using the tube expansion drawing apparatus 14 of embodiment which concerns on this invention. FIG. 3 is a view showing a drawing plug portion and a carriage portion of the pipe expansion drawing device 14 of the embodiment according to the present invention.

The tube expansion underdrawing device 14 expands the end of a mother tube 1 such as a stainless steel tube, titanium, Zircaloy, or steel tube through a die bearing portion 2a of a die portion 2 to form a mouth portion 1a. It has a function of drawing the mother pipe 1 by gripping the mouth portion 1a with the carriage portion 10. - 特許庁

The tube expansion underlay drawing device 14 includes a die portion 2, a die stand portion 3, a core metal 4, a drawing plug portion 5, a plug clamp portion 6, a core metal cylinder portion 7, a stopper portion 8, and a screw screw. A section 9 and a carriage section 10 are provided.

The mother pipe 1 is a cylindrical member (material) having a through hole into which the cored bar 4 can be inserted, and is made of, for example, a stainless steel pipe, titanium, zircaloy, steel pipe, or the like. The main pipe 1 is set in a pipe expanding underlay drawing device 14 as shown in FIG. 1(a).

At this time, as shown in FIG. 1(a), the core metal 4 is inserted into the mother pipe 1, and the mother pipe 1 and the core metal 4 protrude further in the drawing direction than the die portion 2. , the end of the core metal 4 protrudes from the pipe end of the mother pipe 1 .

The die part 2 has a die bearing part 2 a for reducing the wall thickness of the mother pipe 1 and is attached to the die stand part 3 .

The die bearing portion 2a has an insertion hole through which the mother pipe 1 is inserted, as shown in FIG. 1(a). The drawing plug portion 5 has a taper for increasing the diameter of the pipe end portion of the mother pipe 1 . The drawing plug portion 5 has a substantially truncated cone shape, as shown in FIG. 1(a).

Moreover, as shown in FIGS. 3(c) and 3(d), the attachment/detachment structure between the drawing plug portion 5 and the core bar 4 is a screw-in type bayonet structure (FIG. 3(c)) or a substantially U A horseshoe structure (FIG. 3(d)) having a letter shape is preferred.

The plug clamp section 6 is a device that operates to attach the drawing plug section 5 to the end portion 4 a of the core bar 4 that is inserted into the mother pipe 1 . As shown in FIG. 1(a), the plug clamp portion 6 is lowered so as to be attached to the end portion 4a of the core metal 4 that protrudes on the forward side in the drawing direction from the die portion 2, thereby clamping the drawing plug portion 5. It is attached to the core bar 4.

The stopper portion 8 is a movement suppressing member for stopping the mother pipe 1 so that it does not move when the pipe end portion of the mother pipe 1 is expanded by using the core cylinder portion 7 . The stopper portion 8 is provided between the die portion 2 and the core cylinder portion 7, as shown in FIG. 1(a). Also, the stopper portion 8 can be advanced or retracted in the drawing direction using the screw thread portion 9 .

The cored bar cylinder portion 7 is a cylinder device that moves the cored bar 4 along the drawing direction so as to expand the tube end portion of the mother pipe 1 using the drawing plug portion 5 to form the mouth portion 1a. The core cylinder portion 7 includes a cylinder rod having a circular cross section and a pinton.

The carriage part 10 has a chucking structure of a square or more polygonal shape that can hold the expanded mouth part 1a of the mother pipe 1 and maintain the shape without changing the shape of the mouth part 1a by a drawing force.

Here, as shown in FIG. 3(a), the carriage part 10 includes a cylindrical core 12 inserted into the expanded mouth 1a of the mother pipe 1, and eight cores in the cylindrical mouth 1a. and an octagonal pawl portion 11 that contacts with the . Since the octagon has a shape closer to a circle than, for example, a triangle or the like, the shape can be easily maintained even when the mouth 1a is gripped.

Next, a drawing method using the tube expansion drawing device 14 having the above configuration will be described. FIG. 4 is a diagram illustrating a conventional drawing method. First, FIG. 4(a) relates to an empty drawing method. This drawing method is performed for the purpose of reducing the outer diameter, and since the wall thickness also increases or decreases depending on the drawing conditions, dimensional adjustment is required. is difficult.

FIGS. 4(b) and 4(c) show a drawing method in which a tool (plug) used as inner diameter regulation in mandrel drawing is supported by a mandrel and pulled out. Fig. 4(b) and Fig. 4(c) differ in the shape of the tool (plug) to be used, and are selectively used according to the required quality. FIG. 4(b) is highly processed compared to FIG. 4(c). As for the inner surface quality and dimensional accuracy, FIG. 4(c) is good.

FIG. 4(d) is called mandrel drawing, which can reduce the inner diameter and wall thickness at the same time, and is used for processing small-diameter, thin-walled pipes.

The pipe expansion drawing shown in FIG. 4(e) is a method of expanding only the inner diameter, which is the opposite of the processing method shown in FIG. 4(a).

The tube expansion underlay drawing shown in FIG. 4(f) utilizes natural wall thinning due to tube expansion, and furthermore, by regulating the outer diameter side with a die, it is possible to reduce the wall thickness, and high processing is applied.

FIG.4(g) is the figure which showed the drawing-out situation of the floating drawing of FIG.4(b). In general drawing, prior to drawing, the material is drawn to a smaller outer diameter than the drawing die using separate equipment (a drawing machine). The mouth of the die passes through the inner diameter of the die and is chucked by the claws of the carriage to pull it out.

The mouth portion is sandwiched between two opposing claws, and the claws are pulled out by a pull-out force to strengthen the binding force. At this time, since the mouth portion is deformed into an ellipse, there is a problem that it is cut and discarded after drawing and cannot be reused. With respect to such a problem, the tube expansion drawing device 14 of the embodiment according to the present invention exhibits a remarkable effect.

Next, a drawing method using the tube expansion drawing device 14 will be described. First, as shown in FIG. 1(a), the mother pipe 1 is set in the pipe expansion drawing device 14 (S2). The stopper portion 8 is positioned by a screw thread portion 9 . That is, the mother pipe 1 is set so as not to retreat.

After the step of S2, as shown in FIG. 1(b), the drawn plug portion 5 is lowered to the position of the core metal 4 by the plug clamp portion 6 and fixed (S4).

After the step of S4, as shown in FIG. 1(c), the drawing plug portion 5 is retracted by the core cylinder portion 7, and the mother pipe 1 is expanded from the end to form the mouth portion 1a (S6 ). The drawing plug part 5 stops in front of the die part 2 .

After the step of S6, as shown in FIG. 1(d), the carriage part 10 is moved and set to the tip of the mouth part 1a (S8). A core 12 is sandwiched on the inner diameter side of the mouth portion 1a, and a claw portion 11 is sandwiched on the outer diameter side of the mouth portion 1a.

After the step of S8, as shown in FIG. 1(e), after retracting the stopper portion 8, the drawing plug portion 5 is retracted to a designated position of the die portion 2 and stopped (S10).

After the step of S10, as shown in FIG. 1(f), the carriage part 10 is retracted, and pipe expansion thinning drawing is performed (S12).

After the step of S12, as shown in FIG. 1(g), drawing is performed up to the end of the main pipe 1 opposite to the mouth portion 1a to produce a drawn pipe 13 (S14). At this time, the carriage part 10 is stopped or decelerated at the designated position (electrically) at the drawing final end.

After the step of S14, after the carriage portion 10 is stopped or decelerated, the drawing plug portion 5 is retracted to a position behind the rear end portion of the mother pipe 1 as shown in FIG. 1(h) (S16). .

After the step of S16, as shown in FIG. 1(i), the carriage section 10 is advanced in the drawing direction, the drawing tube 13 is released from the die section 2, and the drawing tube 13 is removed from the carriage section 10 (S18). ). At this time, simultaneous release from the die portion 2 and the plug portion 5 is eliminated, and the impact noise and device vibration are eliminated.

After the step of S18, as shown in FIG. 2(j), the core cylinder portion 7 is moved forward and stopped at the initial set position (S20). At this time, the plug clamping part 6 descends and clamps the drawing plug part 5.例文帳に追加

After the step of S20, as shown in FIG. 2(k), the plug clamping section 6 is lifted and waits until the next mother pipe 1 is supplied (S22). After the process of S22, the first drawing is completed.

Next, the second drawing will be described. First, as shown in FIG. 2(l), the mother pipe 1, which is the material after drawing for pipe expansion thinning, is set (S24). As shown in the step of the pipe expansion thinning drawing method in the step of S12, the wall thickness of the mother pipe 1 of 12.0 mm and the product pipe 11 . mm.

After the step of S24, similarly to the step of S4, as shown in FIG. 2(m), the drawn plug portion 5 is lowered to the position of the cored bar 4 by the plug clamp portion 6 and set and fixed (S26). ).

After the step of S26, as in the step of S6, as shown in FIG. The portion 1a is molded (S28). The drawing plug part 5 stops in front of the die part 2 .

After the step of S28, similarly to the steps of S8 and S10, as shown in FIG. 2(o), the carriage part 10 is moved and set to the tip of the opening 1a (S30). Further, the core 12 is held on the inner diameter side of the mouth portion 1a, and the outer diameter side of the mouth portion 1a is held by the claw portion 11, and the drawing plug portion 5 is retracted to a designated position of the die portion 2 and stopped.

After the step of S30, similarly to the step of S12, as shown in FIG. 2(p), the carriage part 10 is retracted to carry out tube expansion thinning drawing (S32). The thickness of the mouth portion 1a at that time is 12.0 mm for the mother tube 1 and 11.0 mm for the product at the time of the first drawing, resulting in a product thickness of 10 mm. When this method is used, there is a remarkable effect that the first opening 1a can be reused for the second drawing.

1 mother pipe 1a mouth portion 2 die portion 2a die bearing portion 3 die stand portion 4 mandrel 4a end portion 5 drawing plug portion 6 plug clamp portion 7 mandrel cylinder portion 8 stopper portion 9 screw thread portion, 10 carriage portion, 11 claw portion, 12 core, 13 drawing pipe, 14 tube expansion drawing device.

Claims (4)

a die bearing portion having an insertion opening for inserting a cylindrical mother pipe and for reducing the wall thickness of the mother pipe;
a drawing plug portion having a taper for increasing the diameter of the pipe end portion of the mother pipe;
a plug clamp portion for attaching the drawn plug portion to the end portion of the core metal inserted into the mother pipe;
a stopper portion for stopping the mother pipe so that it does not move when the pipe end portion of the mother pipe is expanded;
a cored bar cylinder section for moving the cored bar along the drawing direction so as to expand the tube end portion of the mother tube using the drawing plug section and the die bearing section to form a mouth section;
a carriage part having a chucking structure of a square or more polygonal shape that can hold the expanded mouth part and maintain the shape without changing the shape of the mouth part by a drawing force;
A tube expansion drawing device characterized by comprising a. In the tube expansion underdrawing device according to claim 1,
A tube expansion drawing device, wherein a detachable structure between the drawing plug portion and the core metal is a bayonet structure or a horseshoe structure. a die bearing portion having an insertion opening for inserting a cylindrical mother pipe and for reducing the wall thickness of the mother pipe;
a drawing plug portion having a taper for increasing the diameter of the pipe end portion of the mother pipe;
a plug clamp portion for attaching the drawn plug portion to the end portion of the core metal inserted into the mother pipe;
a stopper portion for stopping the mother pipe so that it does not move when the pipe end portion of the mother pipe is expanded;
a cored bar cylinder section for moving the cored bar along the drawing direction so as to expand the tube end portion of the mother tube using the drawing plug section and the die bearing section to form a mouth section;
a carriage part having a chucking structure of a square or more polygonal shape that can hold the expanded mouth part and maintain the shape without changing the shape of the mouth part by a drawing force;
A pipe expansion drawing method using a pipe expansion drawing device comprising
a first step of setting the mother pipe in the pipe expansion underlay drawing device;
After the first step, a second step of attaching the drawing plug portion to the end portion of the cored bar;
After the second step, the mandrel cylinder portion moves the mandrel to the retreating side along the drawing direction, and the end portion of the mother pipe is expanded to form the mouth portion. process and
a fourth step of, after the third step, gripping the mouth portion with the carriage portion and moving the carriage portion forward in the drawing direction to reduce the thickness of the mother pipe;
A pipe expansion drawing method characterized by comprising: In the tube expansion underdrawing method according to claim 3,
a fifth step of stopping or decelerating the carriage after the fourth step and then moving the drawing plug portion to the retreating side;
After the fifth step, a sixth step of moving the carriage portion to the forward side so as to release the thinned drawn pipe from the die bearing portion;
A pipe expansion drawing method characterized by comprising:

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