JP3476093B2 - Stubbing method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stubbing method and apparatus for forming a plurality of projections on the outer circumference of a tubular body.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, a large number of opening projections 15 are provided on the outer periphery of a tube body 13 inserted into a silencer body 11.
It is known that a muffler having a muffler is provided. With such a muffler, a higher muffling efficiency can be obtained as compared with a mere resonator-type muffler (for example, Japanese Utility Model Laid-Open No. 59-1548).
16 publication).

Conventionally, the opening projection 15 to the tube body 13 is provided.
For example, as shown in FIG. 11, after the formation of the slit holes 19 by pressing the metal plate material 17 as shown in FIG.
The slit hole 19 is projected outward by press working to form the opening protrusion 15, and then the plate material 17 is cut into a predetermined length, and this plate material 17a is wound around the cored bar 21 and both edges thereof are welded. It is done by.

[0004]

However, in such a conventional stubbing method, the plate material 17 is cut into a predetermined length after the opening projection 15 is formed, and the plate material 17a is wound around the mandrel 21. Therefore, when the density of the opening protrusions 15 increases, the pressing member for pressing the plate material 17a from the outside during winding contacts the opening protrusions 15, and it becomes difficult to wind the plate material 17a around the mandrel 21. There was a problem.

Further, since the opening protrusions 15 cannot be formed in the vicinity of the welded portion for forming the pipe body 13, when the high-density opening protrusions 15 are provided, there is a problem that they cannot be evenly provided on the pipe body 13. It was

Further, since the opening protrusions 15 are formed by pressing, there is a problem that the equipment becomes large. The present invention has been made in order to solve such a conventional problem, and an object of the present invention is to provide a stubbing method and an apparatus thereof capable of easily and reliably forming high-density projections on a tubular body.

[0007]

A stubbing method according to claim 1 is a stubbing method for forming a plurality of protrusions at a predetermined interval on the outer circumference of a tubular body, wherein a gap corresponding to the protrusions is provided. After inserting the mandrel into the tubular body where the slit hole is formed, project the punch from the mandrel toward the slit hole, and the slit hole side
The protrusion is formed in which an opening is formed .

According to a second aspect of the present invention, in the stubbing method according to the first aspect, after forming a projection in a part of the slit hole of the tubular body, the tubular body is rotated to form a slit hole at a position different from the projection. It forms a protrusion.

According to a third aspect of the present invention, in the stubbing apparatus, an axial hole is formed in the axial direction, and a plurality of guide holes are formed at predetermined intervals in the axial direction to reach the axial hole from the outer circumference. A mandrel, a cam member fitted into the axial hole of the mandrel and having a cam surface inclined in the axial direction at a position facing the guide hole, and fitted into the guide hole of the mandrel. A punch whose inner end surface is brought into contact with the cam surface, a coil spring which biases the punch toward the cam surface, and a moving means which moves the cam member in the axial direction of the mandrel. Done,
The coil spring is longitudinally aligned with the cam member.
Inserted in an elongated hole formed in the axial direction of the
One end is connected to the punch and the other end is connected to the mandrel.
It is connected to the opposite side of the guide hole .

According to a fourth aspect of the present invention, in the stubbing apparatus according to the third aspect, a pressing means for pressing the tubular body, on which the projection is to be formed, toward the guide hole of the mandrel is arranged outside the mandrel. is there.

[0011]

The stubbing apparatus of claim 5 is the
In Claim 3 or 4 , the other end of the coil spring is connected to a mounting member that is detachably fixed to a side opposite to the guide hole of the mandrel.

According to a sixth aspect of the present invention, in the stubbing apparatus according to the third to fifth aspects, the guide hole has a rectangular shape, and an inclined surface is formed at a corner.

[0014]

According to the stubbing method of the first aspect, the projection is formed by inserting the mandrel into the tubular body in which the slit hole is previously formed and projecting the punch from the mandrel toward the slit hole.

In the stubbing method according to the second aspect of the present invention, by rotating the tubular body, slit holes in which protrusions are not formed are sequentially positioned ahead of the punch, and protrusions are formed in the slit holes.

In the stubbing apparatus of the third aspect, when the moving member moves the cam member in the axial direction of the mandrel, the cam surface of the cam member moves, and the punch abutted against the cam surface causes the punch to urge the coil spring . It is projected from the guide hole against. Then, the coil spring is inserted into the slot.
Therefore, even if the cam member moves, it will contact the cam member.
Never.

[0017] In the stabbing processing apparatus according to claim 4, by the pressing means, the tube to form the protrusions, Ru is pressed toward the guide hole of the mandrel.

In the stubbing apparatus of the fifth aspect , the punch is placed in a free state when the attachment member is removed from the mandrel and the connection of the other end of the coil spring is released.

In the stubbing apparatus according to the sixth aspect, the inclined surface is formed at the corner of the guide hole.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show an embodiment of a stubbing apparatus of the present invention, in which reference numeral 31 is used.
Indicates a mandrel.

In the axial direction of the mandrel 31, an axial direction hole 33 having a rectangular cross section is formed. Further, on the outer periphery of the mandrel 31, at a predetermined interval in the axial direction,
A plurality of rectangular guide holes 35 reaching the axially long hole 33 from the outer periphery are formed.

The inclined surface 3 is provided at the corner of the guide hole 35.
5a is formed. In this embodiment, the mandrel 31 is divided into upper and lower parts and connected by bolts 37, as shown in FIG.

A cam member 39 is movably fitted into the axial hole 33 of the mandrel 31. Then, at a position facing the guide hole 35 of the cam member 39, as shown in FIGS. 4 and 5, a cam surface 41 inclined in the axial direction is formed.

A long hole 39a is formed at the center of the cam surface 41 of the cam member 39 so that the longitudinal direction thereof coincides with the axial direction of the cam member 39. The punch 43 is fitted into the guide hole 35 of the mandrel 31.

The inner end surface 45 of the punch 43 is an inclined surface having an angle corresponding to the cam surface 41, and the inclined surface is in contact with the cam surface 41. A protrusion 47 is formed on the outer end surface of the punch 43.

The punch 43 is biased toward the cam surface 41 by a tension coil spring 49 which is a biasing means. That is, in this embodiment, the coil spring 49 is inserted through the elongated hole 39a of the cam member 39.

On the opposite side of the mandrel 31 from the guide hole 35, the mandrel 31 faces the guide hole 35 and extends from the outer circumference to the axial direction hole 3.
A plurality of rectangular hole portions 51 reaching 3 are formed. A bolt 53, which is a mounting member for the coil spring 49, is arranged so as to penetrate through the hole 51, and the coil spring 49 is provided at the center of the bolt 53.
Are connected at one end.

On the other hand, a notch groove 55 is formed in the center of the inner end surface 45 of the punch 43, and a pin member 57 is bridged through the notch groove 55. The other end of the coil spring 49 is connected to the center of the pin member 57.

A lid member 59 is attached to the tip of the mandrel 31.
Are fixed by bolts 61. Mandrel 31
A moving means 63 for moving the cam member 39 in the axial direction of the mandrel 31 is arranged at the rear portion.

That is, the rear portion of the mandrel 31 is fixed to the through hole 67 formed in the support base 65 via the keys 69 and 71 and the bolt 73. A piston rod 75 of a hydraulic cylinder (not shown) is connected to the rear end of the cam member 39 via a bolt 77.

In this embodiment, die steel is used for the punch 43, the cam member 39 and the mandrel 31, and the punch 43 has a Rockwell hardness of 60 to 63 in order to improve wear resistance. The cam member 39 and the mandrel 31 are set to 58 to 60 to improve toughness.

In the stubbing apparatus described above, when the piston rod 75 is moved toward the mandrel 31 side,
The cam member 39 moves toward the tip end side of the mandrel 31, and the cam surface 41 of the cam member 39 moves to cause the cam surface 4 to move.
The punch 43 that is in contact with 1 is pulled inward by the biasing force of the coil spring 49, and is housed in the guide hole 35 as shown on the left side of FIG.

On the other hand, the piston rod 75 is attached to the mandrel 3
When the cam member 39 moves toward the side opposite to 1, the cam member 39 moves toward the side opposite to the tip of the mandrel 31, and the cam member 3
By the movement of the cam surface 41 of 9, the punch 43 abutting against the cam surface 41 resists the biasing force of the coil spring 49 and projects from the guide hole 35 as shown on the right side of FIG.

The stubbing process using the above-described stubbing device is performed as described below. That is, first, as shown in (a) of FIG. 6, a slit hole 81 is formed in advance in a metal plate material 79, the plate material 79 is wound around a mandrel 83, and both end edges are welded to form the slit hole 81. The formed tubular body 85 is obtained.

Thereafter, as shown in FIG. 7B, the mandrel 31 is inserted into the tube body 85, and the punch 43 is projected from the mandrel 31 toward the slit hole 81 to form the projection 87.

FIG. 7 shows a state in which the mandrel 31 is inserted into the tubular body 85, and at this time, the punch 43 is housed in the guide hole 35. FIG. 8 shows the mandrel 31.
It shows a state in which the punch 43 is projected from the slit hole 81 toward the slit hole 81, and by this projection, a protrusion 87 having an opening 89 is formed on the slit hole 81 side.

In the stubbing method described above, however, the mandrel 31 is inserted into the tubular body 85 in which the slit hole 81 is previously formed, and the punch 43 is projected from the mandrel 31 toward the slit hole 81. 8
7 is formed, the protrusion 87 can be easily and reliably formed on the tubular body 85.

Since it is not necessary to wind the plate member having the projections formed on the mandrel to form the tube body as in the conventional case, it is possible to form the projections 87 on the tube body 85 at a high density.

Further, by changing only the shape of the punch 43, it is possible to easily form a projection having a desired shape. Further, the equipment can be downsized as compared with the case where the protrusion is formed by press working.

Then, in the above-described stubbing apparatus, the cam member 39 is moved by the moving means 63 to the mandrel 31.
Moving in the axial direction, the cam surface 41 of the cam member 39 moves and the punch 43 abutting against the cam surface 41 is projected from the guide hole 35 against the biasing force of the coil spring 49. Insert the mandrel 31 into the body 85 and punch 4
The protrusion 87 can easily and surely form the projection 87 on the tube body 85.

Further, by changing the shape of the protruding portion 47 of the punch 43, it becomes possible to easily form various protrusions having different shapes. Further, since the coil spring 49 is used as the biasing means, the coil spring 49
Thereby, the punch 43 can be easily and surely biased toward the cam surface 41.

Further, the coil spring 49 is provided with an elongated hole 39a.
Since it is inserted into the cam member 39, it is possible to reliably eliminate the interference between the cam member 39 and the coil spring 49 when the cam member 39 moves.
It becomes possible to easily urge toward 1.

In the stubbing apparatus described above, when the bolt 53 is removed from the mandrel 31 and the connection of the other end of the coil spring 49 is released, the punch 43 is placed in a free state, so that the punch 43 can be easily replaced. It will be possible.

Further, since the inclined surface 35a is formed at the corner of the guide hole 35, it is possible to effectively prevent the occurrence of cracks at the corner, and the guide area for the punch 43 is increased. The durability can be improved.

FIG. 9 shows a method of forming a large number of protrusions 87 on the outer periphery of the tubular body 85 by using the above-mentioned stubbing apparatus. In this method, first, as shown in (a), The tubular body 85 in which the slit hole 81 is formed is supplied to the clamp portion 93 rotatable by the index motor 91 by, for example, a robot hand (not shown),
The pipe body 85 is clamped to the clamp portion 93.

Thereafter, by moving the clamp portion 93, as shown in (b), the pipe 85 is attached to the mandrel 31.
Is fitted. After the tube body 85 is fitted, the pressing member 95 arranged outside the tube body 85 is driven by a drive mechanism (not shown) and is pressed toward the guide hole 35 of the mandrel 31.

At the position corresponding to the guide hole 35 of the pressing member 95, a recess 95a for escape is formed so that the projections formed do not interfere with each other. In this state, first, the protrusion 87 is linearly formed in the axial direction.

Then, after this, the index motor 91
The clamp portion 93 is rotated by a predetermined angle by the projection 87, and the projection 87 is located at a position different from the already formed projection 87 by a predetermined angle.
Is formed.

In this way, the index motor 91
By sequentially rotating the clamp portion 93 by
As shown in (c), a large number of protrusions 87 are formed on the outer periphery of the tubular body 85.
Is formed.

In the stubbing method described above, the tubular body 8
By rotating 5, the slit holes 81 in which the protrusions are not formed are sequentially located ahead of the punch 43, and the protrusions 87 are formed in the slit holes 81. Therefore, the protrusions 87 can be easily formed on the entire outer periphery of the tubular body 85. Can be formed.

Since the pressing member 95 presses the tube body 85 on which the projection 87 is to be formed, toward the guide hole 35 of the mandrel 31, when the punch 43 forms the projection 87, the tube body 85 moves outward. It is not deformed toward the outside and the shape accuracy of the protrusion 87 can be improved.
The deformation of the tubular body 85 can be reduced.

In the embodiment described above, the coil spring 49 is used as the biasing means, but the present invention is not limited to this embodiment.
For example, an elastic member such as rubber may be used.

In the above-mentioned embodiment, the punch 43 is arranged only on one side of the mandrel 31, but the present invention is not limited to this embodiment. The protrusions 87 may be formed on both sides of the mandrel 31 at the same time. Further, two or three or more pairs of punches may be provided in a cross shape at symmetrical positions in the radial direction. good.

[0054]

As described above, according to the stubbing method of the first aspect, the mandrel is inserted into the tubular body in which the slit hole is formed in advance, and the punch is projected from the mandrel toward the slit hole. Since the ridges are formed, it is possible to easily and surely form high-density projections on the pipe body.

Further, by changing only the shape of the punch, it is possible to easily form a projection having a desired shape.
In the stubbing method according to claim 2, by rotating the tubular body, slit holes in which protrusions are not formed are sequentially located ahead of the punch, and the protrusions are formed in the slit holes, so that the entire outer periphery of the tubular body is formed. The protrusion can be easily formed over the entire area.

In the stubbing apparatus of the third aspect, when the moving member moves the cam member in the axial direction of the mandrel, the cam surface of the cam member moves, and the punch abutted against the cam surface is provided with the urging means. Since it is projected from the guide hole against the force, it is possible to easily and surely form high-density projections on the pipe body by inserting the mandrel into the pipe body and projecting the punch. In addition, the coil spring allows the punch to
It can easily and surely urge it toward the cam surface. It
In addition, since the coil spring was inserted through the long hole,
When moving the material, the cam member and the coil spring
Interference can be reliably eliminated. Also in the punch
It becomes easy to urge the center toward the cam surface.

In the stubbing apparatus of the fourth aspect, since the tube body on which the projection is to be formed is pressed by the pressing means toward the guide hole of the mandrel, the tube body is directed to the outside when the projection is formed by the punch. It is possible to improve the accuracy of the shape of the projection and reduce the deformation of the tubular body.

[0058]

In the stubbing apparatus of the fifth aspect, when the attachment member is removed from the mandrel and the connection of the other end of the coil spring is released, the punch is placed in a free state, so that the punch can be easily replaced. Become.

In the stubbing apparatus of the sixth aspect, since the inclined surface is formed at the corner of the guide hole, it is possible to effectively prevent the occurrence of cracks at the corner, and the guide area for the punch is increased. There is an advantage that the durability of the guide hole can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a stubbing apparatus of the present invention.

FIG. 2 is a top view of FIG.

3 is a cross-sectional view of FIG.

4 is a side view showing the cam member of FIG. 1. FIG.

5 is a top view of FIG. 4. FIG.

FIG. 6 is an explanatory diagram showing an example of a stubbing method of the present invention.

FIG. 7 is a cross-sectional view showing a state in which a mandrel is inserted into the tubular body.

FIG. 8 is a cross-sectional view showing a state in which a mandrel is inserted into a tubular body and a punch is projected.

FIG. 9 is an explanatory diagram showing a method of forming a large number of protrusions on the outer circumference of a tubular body.

FIG. 10 is a cross-sectional view showing a silencer.

FIG. 11 is an explanatory diagram showing a conventional stubbing method.

[Explanation of symbols]

31 Mandrel 33 Shaft longitudinal hole 35 guide hole 35a inclined surface 39 Cam member 39a long hole 41 Cam surface 43 punch 45 Inner end face 49 coil spring 53 volts 63 means of transportation 81 slit holes 85 tube 87 Protrusion 95 Pressing member

Continuation of the front page (56) Reference JP-A-5-92212 (JP, A) JP-A-59-220225 (JP, A) JP-A-59-156521 (JP, A) JP-A-4-100643 (JP , A) JP-A-63-154226 (JP, A) JP-A-51-93490 (JP, A) Actually open 60-15427 (JP, U) Actually open 3-85120 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B21D 22/02 B21D 28/26-28/28 B21D 31/02 B21D 35/00 B21D 53/84

Claims (6)

(57) [Claims] 1. A stubbing method for forming a plurality of protrusions (87) at predetermined intervals on the outer periphery of a tubular body (85), comprising slit holes (81) at intervals corresponding to the protrusions (87). ) in the tube formed (85) in, after inserting the mandrel (31), is projected punch (43) toward said the slit hole (81) from said mandrel (31), said slit hole (81 ) Side has an opening (89)
Stabbing processing method characterized by forming the protrusions (87) being. 2. The stubbing method according to claim 1, wherein after the projection (87) is formed in a part of the slit hole (81) of the tubular body (85), the tubular body (85) is rotated. A stubbing method, comprising forming a protrusion (87) in a slit hole (81) at a position different from the protrusion (87). 3. A plurality of guide holes (35) are formed in the axial direction in the axial direction (33) and reach the axial hole (33) from the outer periphery at predetermined intervals in the axial direction. And a cam surface (41) inclined in the axial direction at a position facing the guide hole (35), which is inserted into the axial direction hole (33) of the mandrel (31). ) Formed cam member (39)
And fitted into the guide hole (35) of the mandrel (31),
A punch (43) having an inner end surface (45) in contact with the cam surface (41), a coil spring (49) for biasing the punch (43) toward the cam surface (41), and the cam a member (39) moving means for moving in the axial direction of the mandrel (31) to (63), it was closed and the coil spring (49), said cam member (3
9) The longitudinal direction is the axial direction of the cam member (39).
It is inserted into the elongated hole (39a) formed as
It is connected to a punch (43) and the other end is connected to the mandrel (3
A stubbing device, which is connected to the side opposite to the guide hole (35) in 1) . 4. The stubbing apparatus according to claim 3, wherein a pipe body (85) on which a protrusion (87) is to be formed is provided outside the mandrel (31) in a guide hole (35) of the mandrel (31). A stubbing apparatus characterized in that a pressing means (95) for pressing toward is arranged. 5. The stubbing apparatus according to claim 3, wherein the other end of the coil spring (49) is the mandrel.
Removably fixed to the opposite side of the guide hole (35) of the dial (31)
A stubbing apparatus, characterized in that it is connected to a mounting member (53) . 6. The stubbing apparatus according to claim 3 , wherein the guide hole (35) has a rectangular shape and is inclined at a corner.
A stubbing apparatus having a surface (35a) formed .