JP2015128785A - Curling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curling device that can perform curling around edges without causing failures, even if a tubular body with a thin thickness and comprising a metal material which is hard and is hard to extend and that can easily be maintained.SOLUTION: An oil supply pipe body 10 is fixed with a fixed die 2. A curling surface 34a is formed in a curling die 3, the curling surface that forms an annular shape corresponding to an end edge 10a of the oil supply pipe body 10 fixed to the fixed die 2, and gradually increases the diameter thereof as going to the side of an anti-fixed die 2. A circumference of the end edge 10a of the oil supply pipe body 10 sequentially comes into slide contact with an outer circumferential side from an inner circumferential side of the curling surface 34a by an approach operation of the curling die 3 to the fixed die 2, and is curled to the outside in the radial direction of the oil supply pipe body 10. A vibration generator 5 for vibrating a punch die 3b of the curling die 3 is mounted on the punch die 3b, when bringing the curling die 3 close to the fixed die 2.

Description

  The present invention relates to a folding processing apparatus that folds around an edge portion of a metal cylindrical body.

  2. Description of the Related Art Conventionally, for example, a fuel supply pipe disclosed in Patent Document 1 includes a cylindrical fuel supply pipe main body having one end having a fuel supply opening and the other end connected to a fuel tank. The end edge part which comprises is turned back in the radial direction by curling (folding process) so that the oiling worker does not cause cut or the like at the end edge.

  The above folding processing is generally performed using a folding processing apparatus, and the folding processing apparatus includes a fixed mold that fixes the fuel supply pipe body, and a folding mold that is disposed to face the fixed mold. The folding mold is formed with a loop surface corresponding to the end edge of the oil supply pipe body fixed to the fixed mold and gradually expanding in diameter toward the anti-fixed mold side. Then, the fixed mold and the folded mold are brought close to each other so that the end edge portion is slidably contacted in order from the inner circumferential side to the outer circumferential side of the folded surface to be folded outward in the radial direction of the oil supply pipe body. ing.

JP 2004-90877 A

  By the way, in the automobile industry in recent years, in order to achieve both improvement in vehicle fuel efficiency and improvement in safety, a lightweight and high-rigidity fuel made of a metal material that is thin and thin and hard to extend. Refueling pipes are being manufactured. If the folding operation of the oil supply pipe body made of such a metal material is performed using the conventional folding processing apparatus as described above as it is, there is a possibility that cracks and cracks frequently occur.

  In order to avoid this, it may be possible to apply a special coating to reduce the frictional resistance on the folding surface of the folding mold or to apply lubricating oil. If it changes, the processing state changes, resulting in variations in the products. Therefore, it is necessary to manage the apparatus severely, which is complicated.

  The present invention has been made in view of such a point, and the object of the present invention is to generate a defect even if it is a cylindrical body made of a metal material that is thin and hard and difficult to extend. It is another object of the present invention to provide a folding processing apparatus that can perform folding processing of an edge portion and that can be easily managed.

  In order to achieve the above object, the present invention is characterized in that the apparatus is vibrated during the folding process.

  Specifically, a fixing means for fixing the metallic cylindrical body, and an anti-fixing means which is disposed opposite to the fixing means and forms an annular shape corresponding to an end edge of the cylindrical body fixed to the fixing means. And a folding means having a folding surface that gradually expands toward the side, and the cylinder is fixed by the fixing means and an approaching operation of the cylindrical body fixed to the fixing means in the cylinder center line direction. The following solutions are intended for a folding device configured to slidably contact the periphery of the end of the cylindrical body from the inner peripheral side to the outer peripheral side of the folded surface in order to fold the cylindrical body radially outward. Measures were taken.

  That is, the first invention is characterized by comprising vibration generating means for vibrating at least one of the fixing means and the folding means during the approaching operation of the fixing means and the folding means.

  According to a second invention, in the first invention, the vibration generating means rotates elliptically around a cylinder center line of the cylindrical body fixed to the fixing means with at least one of the fixing means and the folding means. It is characterized by vibrating.

  In the first invention, since the periphery of the end of the tubular body is folded while repeating contact and non-contact with the folding surface of the folding means, the periphery of the end of the tubular body during the folding process And the frictional resistance between the folding surface of the folding means is reduced. Therefore, the periphery of the end portion of the cylindrical body is smoothly stretched during the folding process, and the occurrence of defects during the folding process such as cracks and cracks can be reduced. In addition, since it is not necessary to periodically perform special coating or lubrication on the folding surface of the folding means, the device can be easily managed and does not require time and effort.

  In the second invention, since the periphery of the edge of the cylindrical body is stretched while being expanded radially outward by the folding surface of the folding means, the plate thickness is reduced at the time of folding around the edge. As compared with the first invention, it is possible to further reduce the occurrence of defects during folding processing such as cracks and cracks.

1 is a folding device according to an embodiment of the present invention. It is a figure which shows the state immediately before performing the return | turnback around the edge part of a cylindrical body by making a return type | mold approach a fixed type | mold from the state of FIG. It is a figure which shows the state in the middle of performing the return | turnback around the edge part of a cylindrical body by making a return type | mold further approach a fixed type | mold from the state of FIG. It is a figure which shows the state which has pinched | interposed the periphery of the edge part of the cylindrical body which performed the folding process by the folding | turning type | mold and the fixed type | mold. It is sectional drawing in the AA of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.

  1 to 5 show a folding device 1 according to an embodiment of the present invention. The folding processing device 1 is configured so that a refueling worker cuts the periphery of an edge portion 10a constituting a fuel supply port of a metal fuel supply pipe body 10 (cylindrical body) that is a main body portion of a fuel supply pipe (not shown) when refueling. It is folded so as not to cause a wound or the like, and includes a fixed mold 2 (fixing means) for fixing the fuel supply pipe body 10 and a folding mold 3 (folding means) arranged to face the fixed mold 2.

  The oil supply pipe body 10 is a cylindrical pipe, and a single female screw portion 10b is formed at a position near the end edge portion 10a.

  A fixed hole 2 a corresponding to the oil supply pipe body 10 is formed through the fixed mold 2.

  Around the opening of the fixing hole 2a, an annular bulging surface 2b having a gently curved cross section is formed bulging to the folding mold 3 side, and a flat portion is formed on the outer side of the annular bulging surface 2b. A dividing surface 2c is formed.

  On the inner peripheral surface of the fixing hole 2a, a protrusion 2d corresponding to the female thread 10b of the oil supply pipe body 10 is formed in a spiral shape, and the protrusion 2d and the female thread 10b are screwed together. The oil supply pipe body 10 is fitted into the fixing hole 2a while being fitted, so that the oil supply pipe body 10 is fixed to the fixed mold 2 in a state where the periphery of the end edge portion 10a protrudes from the opening of the fixing hole 2a. It has come to be.

  The folding mold 3 can be brought into contact with and separated from the fixed mold 2 in the cylinder center line direction of the fuel supply pipe body 10 fixed to the fixed mold 2 by a driving mechanism (not shown), and is subjected to folding processing. A punch die 3b and a support die 3a for supporting the punch die 3b are provided.

  The support die 3a includes a body portion 31 having a substantially cylindrical shape, and an extending portion 32 having a circular cross section provided in the center of the body portion 31 on the fixed die 2 side and extending toward the fixed die 2 side. The central axis of the extending portion 32 coincides with the cylinder center line of the oil supply pipe body 10 fixed to the fixed mold 2.

  And the area | region except the said extension part 32 in the stationary mold | type 2 side of the said main-body part 31 becomes the flat surface 31a extended from the base end side of the said extension part 32 to a radial direction outer side.

  An annular groove 35 is formed near the extending end of the outer peripheral surface 32a of the extending portion 32. The annular groove 35 includes an annular bottom surface 35a and a fixed mold 2 side edge of the bottom surface 35a. The first and second movement restricting surfaces 35b and 35c extend in the radial direction of the extending portion 32 from the opposite side edge portion of the anti-fixed mold 2 and face each other.

  On the other hand, the punch die 3b has an annular shape surrounding the extended portion 32 of the support die 3a, and a gap S1 is formed between the inner peripheral surface 33c and the outer peripheral surface 32a of the extended portion 32. Yes. Note that the gap S1 in FIGS. 1 to 5 is exaggerated for convenience.

  The punch die 3b is slidable along the central axis of the extension portion 32 with respect to the extension portion 32. A first annular shape is formed around the fixed die 2 side opening of the punch die 3b. A protruding portion 33 a is provided to protrude toward the fixed mold 2.

  An annular concave surface 34 facing the annular bulging surface 2b of the fixed mold 2 is formed at a portion continuous to the base end side of the first annular protrusion 33a on the fixed mold 2 side of the punch mold 3b. .

  The annular concave surface 34 has an annular shape corresponding to the end edge portion 10a of the oil supply pipe body 10 fixed to the fixed mold 2, and a folded surface 34a that gradually increases in diameter toward the anti-fixed mold 2 side. The curling surface 34b is continuous with the folded surface 34a and gradually increases in diameter toward the fixed mold 2 side.

  A flat divided surface 33d corresponding to the divided surface 2c is formed on the outer side of the annular concave surface 34.

  Further, a second annular ridge 33b protrudes at a position corresponding to the annular groove 35 on the inner peripheral surface 33c of the punch die 3b.

  A plurality of coil springs 4 are disposed between the outer peripheral portion of the punch die 3b and the outer peripheral portion of the main body 31, and each of the coil springs 4 fixes the punch die 3b to the support die 3a. Always energized to the 2 side.

  When the punch die 3b slides toward the anti-main body 31 with respect to the extended portion 32 by the urging force of each coil spring 4, the second annular protrusion 33b contacts the first movement restricting surface 35b. When the punch die 3b slides toward the main body 31 with respect to the extension portion 32 against the urging force of the coil springs 4, the second movement is performed. The second annular protrusion 33b is brought into contact with the restricting surface 35c so that further sliding movement is restricted.

  As shown in FIG. 5, six vibration generators 5 (vibration generating means) are attached to the outer peripheral surface of the punch die 3b at equal intervals in the circumferential direction.

  Each of the vibration generators 5 is a so-called unbalanced mass type (one that is attached with a mass (weight) eccentric to the motor and rotates to generate vibration by centrifugal force). When the fixed mold 2 and the folding mold 3 are brought close to each other by changing the period, the punch mold 3b is elliptically formed around the cylinder center line of the oil supply pipe body 10 fixed to the fixed mold 2 (see FIG. 5 is rotated and oscillated by an arrow X3).

  And the said folding | turning processing apparatus 1 makes the said folding type | mold 3 approach the oil supply pipe | tube main body 10 fixed to the said fixed type | mold 2 (arrow X1 direction of FIG. 2), and the edge part 10a of the said oil supply pipe | tube main body 10 is carried out. The periphery is slidably contacted in order from the inner circumferential side to the outer circumferential side of the folded surface 34a and folded back to the radially outer side of the oil supply pipe body 10, and is also slidably contacted in order from the inner circumferential side to the outer circumferential side of the curling surface 34b. It is configured to perform processing.

  Next, the folding process around the edge part 10a in the oil supply pipe body 10 using the folding process apparatus 1 will be described in detail.

  FIG. 1 shows a state where an oil supply pipe body 10 before being folded is fixed to a fixed mold 2. In this state, the punch mold 3b is slid to the fixed mold 2 side with respect to the support mold 3a by the biasing force of each coil spring 4.

  When the vibration generator 5 starts to vibrate from the state shown in FIG. 1 and the folding die 3 approaches the fixed die 2 (arrow X1) as shown in FIG. 2, the first annular protrusion of the punch die 3b is obtained. The strip 33a is fitted into the oil supply pipe body 10.

  Then, when the folding die 3 is further moved closer to the fixed die 2 from the state of FIG. 2, the periphery of the end edge portion 10a of the oil supply pipe body 10 extends from the inner circumferential side to the outer circumferential side of the folding surface 34a as shown in FIG. Are sequentially slidably contacted with each other and folded outwardly in the radial direction of the oil supply pipe body 10, and slidably contacted in order from the inner peripheral side to the outer peripheral side of the curling surface 34 b to be subjected to curling processing. The dividing surface 33d of the punch mold 3b is brought together.

  Thereafter, the vibration of each of the vibration generators 5 is stopped and the support mold 3a is further pressed toward the fixed mold 2 side. Then, the support mold 3a slides toward the fixed mold 2 against the biasing force of each coil spring 4 (arrow X2), and the second movement restricting surface 35c comes into contact with the second annular protrusion 33b and the punch The flat surface 31a of the main body 31 abuts against the anti-fixed mold 2 side of the mold 3b, and the periphery of the edge portion 10a of the oil supply pipe main body 10 subjected to the folding process is formed with an annular bulging surface 2b and an annular concave surface 34. Is held in a pressurized state. By the clamping operation around the edge portion 10a by the annular bulging surface 2b and the annular concave surface 34, the inclined surface 10c having high surface accuracy and roundness is provided at a location corresponding to the folded surface 34a around the edge portion 10a. Is formed, and when a filler cap (not shown) is turned to the oil supply port of the oil supply pipe body 10, airtightness between the filler cap and the sealing material is increased.

  Thereafter, the folding mold 3 moves away from the fixed mold 2 and the coil spring 4 causes the punch mold 3b to slide relative to the support mold 3a toward the fixed mold 2 to return to the original position.

  Then, the oil supply pipe body 10 is removed from the fixed mold 2, and the folding process around the end edge portion 10 a of the oil supply pipe body 10 is completed.

  As described above, according to the embodiment of the present invention, the periphery of the end edge portion 10a of the oil supply pipe body 10 is folded back while repeating contact and non-contact with the folding surface 34a of the folding mold 3, so The frictional resistance between the periphery of the end edge portion 10a of the oil supply pipe body 10 and the folding surface 34a of the folding mold 3 is reduced. Therefore, the periphery of the end edge portion 10a of the oil supply pipe body 10 is smoothly stretched during the folding process, and the occurrence of defects during the folding process such as cracks and cracks can be reduced. In addition, since it is not necessary to periodically perform special coating or lubrication on the folding surface 34a of the folding mold 3, the folding processing apparatus 1 can be easily managed and does not require time and effort.

  In addition, since the periphery of the end edge portion 10a of the oil supply pipe body 10 is stretched while being spread outward in the radial direction by the folding surface 34a of the folding mold 3, the thickness reduction at the time of folding processing around the edge portion 10a is performed. Further, the occurrence of defects such as cracks and cracks during folding processing can be reduced.

  In the embodiment of the present invention, the folding process is performed around the edge portion 10a of the oil supply pipe body 10 while vibrating the punch mold 3b of the folding mold 3 with a plurality of vibration generators 5. However, the present invention is not limited to this. Instead, the folding process may be performed around the edge portion 10 a of the oil supply pipe body 10 while vibrating the fixed mold 2, and the folding process may be performed while vibrating at least one of the fixed mold 2 and the folding mold 3.

  Further, in the embodiment of the present invention, the so-called unbalanced mass type vibration generator 5 is used. However, by supplying a current to the coil in a vibration type generator called a hydraulic type that drives the piston by hydraulic pressure or in a magnetic field. You may make it vibrate the fixed mold | type 2 or the folding | turning mold | type 3 using the vibration generator called the electrodynamic type | mold using the force which arises.

  Furthermore, in the embodiment of the present invention, each vibration generator 5 causes the punch die 3b to rotate and vibrate around the cylinder center line of the oil supply pipe body 10 fixed to the fixed die 2, but is not limited thereto. The punch die 3b may be vibrated in the cylinder center line direction of the oil supply pipe body 10 fixed to the fixed die 2.

  In addition, in the embodiment of the present invention, the periphery of the end edge portion 10a of the oil supply pipe body 10 is folded back by the folding surface 34a and the curling surface 34b is subjected to curling processing. However, it is essential to perform the curling processing. is not.

  In the embodiment of the present invention, when the folding process is performed, the folding mold 3 is moved closer to the stationary mold 2, but the stationary mold 2 is moved closer to the folding mold 3. Also good.

  Moreover, in embodiment of this invention, although the punch type | mold 3b is vibrated with the six vibration generators 5, you may vibrate the punch type | mold 3b with the 1-5 vibration generators 5, and seven or more The punch die 3b may be vibrated by the vibration generator 5. Furthermore, although the six vibration generators 5 are arranged at equal intervals in the circumferential direction on the outer peripheral surface of the punch die 3b, they may not be arranged at equal intervals in the circumferential direction.

  In the embodiment of the present invention, the oil supply pipe body 10 is fixed to the fixed mold 2 having the fixing holes 2a and the folding process is performed by the folding mold 3. A clamping die for fixing the oil supply pipe main body 10 is used in a forming die for threading and forming the screw 10b, and the folding die 3 around the edge portion 10a of the oil supply pipe main body 10 which is fixed with the clamp die immediately after the threading processing. It is also possible to apply a folding process.

  The present invention is suitable for a folding device that folds around the edge of a metal cylindrical body.

1 Folding device 2 Fixed type (fixing means)
3 Folding type (wrapping means)
5 Vibration generator (vibration generating means)
10 Oil supply pipe body (cylindrical body)
10a Edge 34a Turned surface

Claims (2)

Fixing means for fixing the metal cylindrical body;
Folding means disposed opposite to the fixing means, forming a ring corresponding to the end edge of the cylindrical body fixed to the fixing means, and having a folding surface that gradually increases in diameter toward the anti-fixing means side. ,
By the approaching operation of the cylindrical body fixed to the fixing means of the fixing means and the folding means in the direction of the center line of the cylinder, the periphery of the edge of the cylindrical body is changed from the inner peripheral side to the outer peripheral side of the folded surface. A folding device configured to slidably contact with each other in turn and fold outward in the radial direction of the cylindrical body,
A folding processing apparatus comprising vibration generating means for vibrating at least one of the fixing means and the folding means when the fixing means and the folding means are approaching each other. In the folding | turning processing apparatus of Claim 1,
The folding processing apparatus characterized in that the vibration generating means causes at least one of the fixing means and the folding means to rotate and vibrate in an elliptical shape around a cylinder center line of the cylindrical body fixed to the fixing means.

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