JP2935830B2 - Profile processing method for pipe material slits - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing method for forming a required profile at a corner portion in the thickness direction of a slit of a pipe material having a slit formed thereon and in the vicinity thereof.

[0002]

2. Description of the Related Art In recent years, for example, a TV camera has been run along a skating rink in order to catch an athlete who is sliding on a skating rink in the vicinity of the skating rink and broadcast it. For this purpose, as shown in FIG. 21, a tube 2 having a slit 1 formed in the longitudinal direction is laid along the skating rink, and a traveling mechanism of the TV camera 3 is provided inside the tube 2. An arm member 4 provided on the traveling mechanism is projected from the slit 1 of the tube member 2, a TV camera 3 is mounted on the arm member 4, and the TV camera 3 is caused to travel in accordance with the athlete's sliding speed. Can be broadcast on TV.

[0003] A tube material 2 used for such an application is shown in FIG.
23, a slit 1 is formed in the axial direction of the tube 2 as shown in FIG. 23 by machining (using a machine tool such as a planing machine or a broaching machine). Forming the part 5 in a predetermined profile 6 is performed.

[0004]

However, in the above-mentioned machining method using a machine tool or the like, the machining length of the tube material 2 is limited, and machining of the long tube material 2 is impossible. There is a problem that processing is troublesome and causes an increase in cost.

The present invention has been made in order to solve such a problem, and can cope with a longer tube than conventional machining, and can form a slit using a plug and a die. It is an object of the present invention to provide a method of processing a profile of a slit of a pipe material, which can form a required profile at a corner in a thickness direction of the slit in one operation step when pulling out the pipe material.

[0006]

In order to solve the above-mentioned problems of the prior art, a method of profiling a slit of a pipe material according to the present invention comprises a plug having an axial projection formed on an outer peripheral surface and an axial line formed on an inner peripheral surface. The plug and the dice pair selected from the dice having the protrusions formed in the direction, the plugs having no protrusions, and the dice having no protrusions are placed concentrically in the dice at predetermined positions on the fixing base. The plug is inserted into at least one of the protrusions of the plug and the die in an axial slit provided in advance in the tube, and the tube is inserted between the die and the plug. At the same time as the plug and the die are pressed by at least one of the projections, resulting in plastic deformation due to the required process corresponding to the shape of the projection at and near the slit of the tube. And forming a I le.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a processing apparatus for carrying out a method of profiling a pipe into a slit according to the present invention will be described below with reference to FIGS. FIG.
FIG. 2 shows a tube drawing machine 10 (cold drawing machine) for drawing and reducing the diameter of a tube 2 using a plug and a die. The processing apparatus according to the present invention uses the tube drawing machine 10. The tube drawing machine 10 includes a bed 11, a rod fixing portion 12, a die fixing stand 13, and a pipe material pulling means 14.
And a rod 20. As shown in FIG. 2, a plug 16 and a dice 18 are provided inside the dice fixing base 13.

[0008] The bed 11 is in the shape of a long and narrow base, and the die fixing base 13 is provided substantially at the center. And
The die fixing stand 13 is provided with a die mounting portion 19 in the longitudinal direction of the bed 11 at a portion located above the upper surface of the bed 11, and the die mounting portion 19 has a die 18.
Is installed. Further, the rod fixing portion 12 is provided at one end of the bed 11, the base end of the rod 20 having the plug 16 fixed to the tip is fixed to the rod fixing portion 12, and the plug 16 is inserted into the center of the die 18. The plug 16 is inserted into the hole 21 so that the plug 16 is fixed at that position.

On the bed 11 on the opposite side of the rod fixing portion 12, a pipe material pulling means 14 is provided so as to be movable on the upper surface of the bed 11 in the longitudinal direction. The pipe pulling means 14 includes a main body 23 that can be moved on the bed 11 by wheels 22, a chuck 24 that is fixed to the die fixing base 13 side of the main body 23 and that bites an end of the pipe 2.
Hook 2 fixed to main body 23 on opposite side of chuck 24
5 and a chain 27 wound around a sprocket 26 to bite the hook 25. And chain 27
Is driven leftward in FIG. 1 by a driving sprocket not shown. Reference numeral 28 denotes an oiling device for the plug 16, the die 18 and the pipe 2 when the pipe 2 is pulled out.

As shown in FIG. 3, a tubular member 2 is used in which one slit 1 parallel to the axis is formed in advance on the peripheral surface. The pipe member 2 having the slit 1 as described above is available from a steel pipe manufacturer.

The plug 16 has a cylindrical shape as shown in FIGS. 4 and 5, the outer peripheral surface is finished with high precision, and a female thread 29 is formed at one end in the axial direction. The external thread portion of the rod 20 is screwed into the female thread portion 29, and the proximal end portion of the rod 20 is fixed to the rod fixing portion 12 as described above.

FIGS. 6 to 8 show a protruding plug 16A used in place of the plug 16. FIG. The protruding plug 16A has a single axial projection 30 formed on the outer peripheral surface in the axial direction, and the projection 30 is finished with high precision. The proximal end of the protruding plug 16A has an internal thread 2 in the axial direction.
9 are formed. Note that the projection 30 is
A is formed to be slightly shorter than the entire length of A, and as shown in FIG.
An arrow part 31 having a taper whose width decreases toward the end on the female screw part 29 side when viewed from above is formed on the side of the part 9. The external thread portion of the rod 20 is screwed into the female thread portion 29, and the proximal end of the rod 20 is connected to the rod fixing portion 1.
Fixed to 2. When the protruding plug 16A is used, the profile 32 shown in FIG.
Can be formed.

The protruding plug 16B shown in FIG. 9 has three protrusions 30 formed in parallel to the axial direction.
By using 6B, as shown in FIG.
Can be formed as shown in FIG.

The die 18 is of a color type as shown in FIGS. 10 and 11, and includes a die receiver 33 and a die body 34. The right side of FIG. Is the exit side. The die receiver 33 is of a collar type, and has a stepped portion 35 into which a die body 34 is fitted, formed on the center left side of FIG. 10 and a funnel-shaped opening on the left side of the stepped portion 35 toward the outlet side. Exit 36
Are formed.

The die body 34 is also of a collar type, and the insertion side is a trapezoidal insertion portion 21 that opens toward the insertion side so that the tube 2 can be easily inserted. On the outlet side following the insertion portion 21, a dimensionally formed portion 37 which is straight and precisely machined in parallel to the axis is formed. This dimensioned portion 37 is used to precisely finish the outer diameter of the tube material 2. It is finished with high precision.

FIGS. 12 and 13 show the above-mentioned die body 3.
4 shows a protruding die 18A in which one mountain-shaped protrusion 38 in the axial direction is formed on the inner peripheral surface, and this protrusion 38 is formed in parallel with the axis and is slightly on the exit side of the dimension forming portion 37 of the die 18 described above. It has a length up to the inside. The protrusion die 18A has the same structure as the above-described die 18 except for the protrusion 38, and the protrusion 38 and the dimension forming portion 37 are finished with high precision. When the protruding die 18A is used, a profile 32 as shown in FIG. 20C can be formed as described later.

Next, the pipe material 2 is
A method for processing a profile on the slit 1 will be described.

FIGS. 14 and 15 show a case where a profile 32 of a required shape is formed at the inner corner 39 in the thickness direction of the slit 1 of the tube material 2 using the protruding plug 16A and the die 18. First, as shown in FIG. 14, the squeezed portion 40 of the tube material 2 having the squeezed portion 40 formed at the tip is
8 and the throttle unit 40 is held by the chuck 24. Then, the external thread portion 41 of the rod 20 is screwed into the female thread portion 29 of the projecting plug 16A (FIG. 15), and the projecting plug 16A is inserted into the slit 1 of the tube 2 while the projection 30 is inserted into the slit 1 from the rear end of the tube 2. And the tip of the protruding plug 16A is positioned near the insertion portion 21 of the die 18,
The tube 2 is brought into contact with the insertion portion 21 of the die 18 so that the rod 2
0 is fixed to the rod fixing portion 12. After a while
When the driving device of the pipe material pulling means 14 is driven to move the chain 27 to the left in FIG. 1, the hook 25 moves to the left in a direction away from the die fixing base 13, and the pipe material 2 is pulled. After being narrowed down by the insertion portion 21 of the die body 34 and the outer peripheral surface of the protruding plug 16A, the outer peripheral surface of the protruding plug 16A and the dimension forming portion 37 of the die 18 as shown in FIG.
As a result, the diameter of the tube material 2 is reduced as a whole, and the inner corner edge 39 (FIG. 18A) of the slit 1 of the tube material 2 is plastically deformed by the pressing by the protrusion 30, and the profile 32 corresponding to the shape of the protrusion 30. (FIG. 18B) is formed. The profile 32 can be formed over the entire length of the slit 1 of the tube 2 by moving the tube 2 in the axial direction.

FIG. 18 shows the formation of the profile 32 in the slit 1 of the tube 2 and the change in the dimension of the tube 2 by the profile processing method of the present invention.
Is 70 mm, inner diameter M is 54.7 mm, and wall thickness N is 7.65.
The 2 mm pipe member 2 is squeezed by the inner diameter of the die 18 and the projection 30 having the outer diameter and cross section of the protruding plug 16A having a chevron shape and forming a bulge of 4 mm in the skirt portion, and the outer diameter L ′.
Is 64 mm, the inner diameter M 'is 50 mm, and the thickness N' is 7 mm.
In 9, a profile 32 having a 4 mm radius (R) shape is formed.

FIGS. 16 and 17 show the outer corner 42 of the slit 1 of the tube 2 in the thickness direction using the plug 16 and the projecting die 18A (FIG. 18 (a). FIG. 16 shows a case in which a profile 32 having a required shape is formed. First, as shown in FIG. The narrowed portion 40 of the tube 2 is passed through the protruded die 18A as a position corresponding to the protrusion 38 of the protruded die 18A, and the narrowed portion 40 is held by the chuck 24. Next, the external thread 41 of the rod 20 is screwed into the female thread 29 of the plug 16 and the plug 16 is inserted from the rear end of the pipe 2 into the interior of the pipe 2 so that the tip of the plug 16 is inserted into the insertion hole of the protruding die 18A. After the tube 2 is brought into contact with the insertion hole 21 of the protruding die 18A so as to be located near the
Is fixed to the rod fixing portion 12. Thereafter, when the driving device of the pipe material pulling means 14 is driven to move the chain 27 to the left in FIG. 1, the hook 25 is moved and the pipe material 2 is pulled, and as shown in FIG.
After the pipe material 2 is narrowed down by the insertion hole 21 and the outer peripheral surface of the plug 16, the diameter is reduced by the outer peripheral surface of the plug 16 and the dimension forming portion 37 of the protruding die 18 </ b> A. The portion 42 is plastically deformed by the pressing by the projection 38, and the profile 32 corresponding to the shape of the projection 38 is formed. The profile 32 can be formed over the entire length of the slit 1 of the tube 2 by moving the tube 2.

FIG. 19 shows a slit 1 of a tube 2 obtained by the method of profiling a slit of a tube according to the present invention.
FIGS. 4A and 4B show examples of a profile 32 formed on an inner corner edge portion 39 of FIG.
(B) shows a profile 32 having an arc shape formed by the protruding plug of FIG. 9 and concave grooves on both sides thereof, (c).
The linear profile 32, (d) is formed in a direction extending from the outside of the slit 1 to the inside, and the arc-shaped profile 32, (e) is formed in the direction spreading from the outside of the slit 1 to the inside. (F) shows a U-shaped profile 32. The shape of these profiles 32 depends on the protruding plug 16A.
Is determined according to the cross-sectional shape of the projection 30.

FIG. 20 shows a slit 1 of a pipe 2 obtained by the method of profiling a slit of a pipe according to the present invention.
(A) shows a profile 32 in which both sides of a slit 1 are parallel to each other, and (b) shows an outwardly arcuate shape and the shape of the slit 1. Having concave grooves on the inner peripheral surface on both sides of the profile 3
2, (c) is an arc-shaped profile 32, (d) is an arc-shaped profile 32 formed in a direction expanding from the inside to the outside of the slit 1, (e) is a U-shaped profile 32, (f) is a linear profile 3 formed in a direction expanding from the inside of the slit 1 to the outside.
2 is shown. The outer diameter of the plug, the inner diameter of the die, and the shape of the projection used in the profile processing apparatus of the present invention are determined by the outer diameter and the inner diameter of the pipe, and the shape of the projection required for the slit of the pipe. Selected accordingly. Further, in the present embodiment, the profile is formed on either the inside or the outside of the slit.
By using a protruding plug and a protruding die, a profile can be simultaneously formed on the inner corner portion and the outer corner portion of the slit.

[0023]

According to the present invention, the conventional method uses only a plug or (and) a die having an axial projection inserted into the slit of the tube material, without using a complicated cutting method for the tube material having the slit. The profile can be processed with respect to the slit of the long tube material by using the tube drawing machine. In addition, since the profile is easily formed in the slit in a single operation of pulling out the pipe material by the plug and the die, it is possible to greatly reduce the processing time.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a processing apparatus used for a method for profiling a pipe into a slit according to the present invention.

FIG. 2 is a partial longitudinal side view of a die fixing base portion of FIG. 1;

FIG. 3 is a perspective view of a tube member in which a slit is formed.

FIG. 4 is a side view of the plug.

FIG. 5 is an end view as viewed from A in FIG. 4;

FIG. 6 is a side view of a protruding plug used in the present invention.

FIG. 7 is a top view of FIG. 6;

FIG. 8 is an end view as viewed from B in FIG. 6;

FIG. 9 is an end view of a protruding plug in which three protrusions are formed.

FIG. 10 is a vertical sectional side view of a die.

FIG. 11 is an end view as viewed from C in FIG. 10;

FIG. 12 is a vertical side view of a projection die used in the present invention.

13 is an end view as viewed in the direction D in FIG. 12;

FIG. 14 is an explanatory diagram of an initial stage in processing a profile using a protruding plug.

FIG. 15 is an explanatory diagram of a drawing stage in processing a profile using a protruding plug.

FIG. 16 is an explanatory diagram of an initial stage in processing a profile using a protruding die.

FIG. 17 is an explanatory diagram of a drawing stage in processing a profile using a protruding die.

FIG. 18 is an explanatory diagram showing a change in dimension of a pipe material when processing a profile using a protruding plug.

FIG. 19 is a shape diagram of a profile formed on an inner corner edge in the thickness direction of a slit of a tube material and its vicinity.

FIG. 20 is a shape diagram of a profile formed in an outer corner edge of a slit of a tube material in a thickness direction and in the vicinity thereof.

FIG. 21 is an explanatory view showing an example of use of a tube member having a slit formed therein.

FIG. 22 is a perspective view of a tube.

FIG. 23 is a perspective view of a tube member provided with a slit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slit 2 Pipe material 10 Drawing machine 12 Rod fixing part 13 Dice fixing stand 14 Pipe material pulling means 16 Plug 16A Protrusion plug 18 Dice 18A Protrusion die 30 Protrusion 32 Profile 33 Dice receiver 34 Die main body 37 Precision processing part 38 Protrusion 39 Inner corner Part 42 outside corner edge

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21C 1/00

Claims (1)

(57) [Claims] 1. A plug selected from a plug having an axial projection formed on an outer peripheral surface, a die having an axial projection formed on an inner peripheral surface, a plug having no projection formed, and a die having no projection formed. And a pair of dies are fixed so that the plug is positioned concentrically in the die at a predetermined position on the fixing base, and at least one projection of the plug and the die is inserted into an axial slit provided in advance in the tube material, After the tube is inserted between the die and the plug, the tube is squeezed by the plug and the die to reduce the diameter, and the tube is pulled out. At the same time, the plastic is deformed by the pressing of at least one of the plug and the die. Forming a required profile corresponding to the shape of the projection on the slit of the pipe material.