JPH04100643A - Method and device for opening pipe hole - Google Patents

Abstract

PURPOSE:To easily open a hole of an arbitrary shape in the side wall of a pipe without generating flashes on the inner side of the pipe by moving a punch in the direction perpendicular to the major axis of the pipe to project a cutting edge part provided at the front end of the punch toward the outside wall surface side from the inside wall surface side of the side wall of the pipe. CONSTITUTION:The pipe 50 is fitted to the outer side of a punch holder 10 and a die 38 corresponding to a punch 18 fitted into the fitting part 12 of the punch holder 10 is disposed on the outer side of the pipe. The die and the pipe 50 are fixed by a die holder 36 and a metallic die 40. A pin 28 moves together with a shaft bar body 24 when the shaft bar body 24 is pushed inward of the punch holder 10. The displacement of the shaft bar body 24 is converted to the displacement of the punch 18 in the direction perpendicular to the major axis of the punch holder 10 and the cutting edge part 19 of the punch 18 is protruded by a prescribed length (a) toward the outside from the outside wall surface of the punch holder 10. The cutting edge part 19 of the punch 18 cuts the side wall of the pipe from the inside wall surface to the outside wall surface of the pipe 50, thereby opening the hole.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pipe hole drilling method and apparatus that can accurately and efficiently open a hole in the side wall of a pipe.

(Prior Art) Conventionally, holes are often made in the side wall of a pipe by drilling using a drill press or the like.

Further, if conditions such as the inner diameter of the pipe are permissible, the hole may be opened by a press operation using a punch having the same cross-sectional shape as the hole to be opened.

In this case, due to the stroke of the press device, a cylindrical die is inserted inside the pipe, and a punch corresponding to the die is operated from the outside of the pipe in a direction perpendicular to the long axis of the pipe. The hole is being drilled.

(Problems to be Solved by the Invention) When drilling a hole using the drill press, the drill is operated from outside the pipe in a direction perpendicular to the long axis of the pipe due to the stroke of the drill press. Since the holes formed in this manner generate burrs inside the pipe, the task of removing the burrs is extremely troublesome and, in some cases, impossible.

Even if deburring is possible, removing the deburrs from the inside of the pipe usually requires manual sanding, which is inefficient and does not result in a consistent quality product over and over again. , not suitable for mass production process.

Furthermore, the shape of the hole formed by the drill is limited to a circle, and it is difficult to open a hole of any shape.

In addition, when drilling holes using conventional press work, due to the stroke of the press device, the punch is operated from the outside of the pipe in a direction perpendicular to the long axis of the pipe to open the hole in the side wall of the pipe. , similar to drilling with a drill press, cracks in the drilled hole occur inside the pipe.

When opening a hole by such conventional press work,
Since the die is inserted inside the pipe and the punch is operated from the outside of the pipe, the pipe is processed in the direction of being crushed, and cracks are generated inside the pipe.

Therefore, sufficient clearance is required to remove the processed pipe from the die and take it out.

However, if this clearance is taken, a moment is likely to be applied to the die, and especially for pipes with a small diameter and a long span, the diameter of the die is limited due to dimensions and the moment becomes large, so it is necessary to set a die with sufficient strength. becomes difficult.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned conventional problems and to provide a hole opening for a pipe that can easily and efficiently open a hole of an arbitrary shape in the side wall of the pipe without causing any cracks inside the pipe. An object of the present invention is to provide a method and a device thereof.

(Means for Solving the Problems) In order to achieve the above object, the present inventor fixed a die on the outside of the pipe and operated a punch corresponding to the die from inside the pipe. We thought that it would be effective to make a hole in the side wall, and as a result of our studies, we arrived at the method and apparatus for making a hole in a pipe according to the present invention.

That is, when opening a hole in the side wall of a pipe, the present invention inserts a punch holder equipped with a punch movable in a direction perpendicular to the long axis of the pipe into the inside of the pipe, and then After fixing the pipe by placing a die corresponding to the punch on the outside of the pipe, the punch is moved in a direction perpendicular to the long axis of the pipe, and the cutting edge provided at the tip of the punch is inserted into the pipe. A method for making a hole in a pipe is characterized in that the side wall of the pipe is made to protrude from the inner wall side to the outer wall side in the same way.

The present invention also provides a hole punching device for opening a hole in a side wall of a pipe, which is a cylindrical body that can be inserted into the inside of the pipe, and is bored along the long axis of the cylindrical body. A punch holder is provided with a fitting part perpendicular to the shaft passage part, and the opening of the fitting part is opened on the surface of the cylindrical body, and the punch holder is slidably inserted into the shaft passage part of the punch boulder. The shaft rod inserted into the punch holder is slidably inserted into the insertion part of the punch holder. The pipe punching device is characterized by comprising a punch that slides in the direction of the punch and has a cutting edge protruding from the outer wall surface of the punch holder.

(Operation) A pipe is inserted into the outside of the punch holder of the present invention, and with a die arranged outside the pipe and the pipe fixed, the punch attached to the punch holder is operated.

The punch moves in a direction perpendicular to the long axis of the pipe, and a cutting edge provided at the tip of the punch protrudes from the inner wall surface of the side wall of the pipe toward the outer wall surface.

At this time, the punch can cut the side wall of the pipe and open a hole from the inside of the pipe.

As a result, a hole of any shape can be opened depending on the shape of the cutting edge of the punch.

Furthermore, this hole is made because the punch operates from the inside of the pipe to the outside, so no stiffness occurs on the inside of the pipe.
Since it occurs on the outside, it is extremely easy to remove the firmness.

Further, since the pressing force of the punch acts in a direction to widen the pipe diameter and no stiffness is generated on the inside, there is no problem in taking out the pipe after the hole is punched.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a perspective view showing an exploded state of a punch side device constituting a hole punching device according to an embodiment of the present invention, in which 10 is a punch holder, 24 is a shaft body, 18 is a punch, 28 is a pin, 30 is an interlocking body, 32 is a spring, and 34 is a cap nut.

Next, each of the above configurations will be explained.

The punch holder 10 has a cylindrical body that can be inserted into the inside of a pipe to be processed, and has a shaft passage portion 14 that passes through the cylindrical body along its long axis. This shaft passage part 1
4, the shaft rod body 24 and the interlocking body 30 can be inserted from the other end.

Further, the punch holder 10 is provided with a fitting portion 12 that penetrates the shaft passage portion 14 orthogonally.

The punch 18 can be slidably inserted into the fitting portion 12 in a direction perpendicular to the long axis of the punch holder 10.

The side wall of the punch holder 10 is also provided with a through hole 16 into which a pin 28 can be inserted, which locks onto the shaft body 24 and engages with the punch 18 during assembly.

Note that since this through hole 16 is used for inserting the pin 28, it only needs to be slightly larger than the pin 28.

Further, a cap nut 34 that encloses and holds the interlocking body 30 and the spring 32 is screwed onto the end face side opposite to the end face where the shaft passage portion 14 into which the shaft rod body 24 of the punch holder 10 is inserted is opened. A threaded portion 15 is provided.

The shaft rod 24 that is slidably inserted into the shaft passing portion 14 of the punch holder 10 is sandwiched between the ends so that one end thereof is inserted into the communication portion 20 of the punch 18 . A locking hole 26 for locking a pin 28 is bored in this end.

This locking hole 26 is an elongated hole having a long axis that intersects at a predetermined angle with respect to the central axis of the shaft rod body 24 .

The punch 18 has a communication portion 2 into which the end of the shaft rod 24 fits.
0, and a pair of engagement holes 22 are also provided on both wall surfaces of the communication portion 2o, which engage with a locking hole 26 at the end of the shaft rod 24 to be inserted by a pin 28.

This engagement hole 22 is a retaining hole 2 provided in the shaft rod body 24.
Corresponding to 6, it is also an elongated hole that intersects at a predetermined angle with respect to the axis of the communication portion 20.

The length of the pin 28 is slightly shorter than the width of the punch 18,
Its cross-sectional shape is almost congruent with the locking hole 26 and the engaging hole 22 into which it is inserted, and has an oval shape with a pair of opposing sides serving as parallel straight sections.

The interlocking body 30 is a rod having a flange, and a cap nut 34
is a cylindrical body whose one end surface is a closed surface and which encloses the wing 32 and the interlocking body 30.

Next, the connection relationship of the above structure will be explained together with an assembly method.

After inserting the punch I8 into the insertion part 12 of the punch holder 10 and inserting the end of the shaft rod 24 into the communication part 20 of the punch 18, insert the pin from the through hole 16 provided in the side wall of the punch holder 10. Insert 28.

This pin 28 is inserted into the pair of engagement holes 22 of the punch 18 and the locking hole 26 of the shaft rod body 24, and the two engage with each other.

At this time, the shaft rod 24 is inserted into the locking hole 2 as shown in FIG.
A pin 28 is locked to 6 to form a driving link 23 of the cam mechanism.

Further, since the pin 28 engages with the pair of engagement holes in the punch 18, a subordinate joint 17 of the cam mechanism is formed.

The engagement between the dependent node 17 and the driving node 23 causes the driving!
The reciprocating motion of the shaft body 24, which is ff23, can be converted into the vertical motion of the punch 18, which is the subordinate joint 17.

Further, the interlocking body 30 is connected to the shaft passing portion I4 of the punch holder 10.
The insertion length of the interlocking body 30 is limited by the flange of the interlocking body 30, and the end surface facing the flange of the interlocking body 30 allows the shaft rod 24 to be inserted into the shaft passage portion 14. Insertion length is limited.

This interlocking body 30 is urged inward of the punch holder 10 by a spring 32 contained in a cap nut 34 screwed into the threaded portion 15 of the punch holder.

Next, the operation of the apparatus shown in this embodiment will be explained.

The third part is a longitudinal cross-sectional view showing the operating state of the apparatus shown in the embodiment of FIG. 1, and FIG. 4 is a cross-sectional view of FIG. 3.

As shown in FIGS. 3 and 4, a pipe 50 to be processed is fitted on the outside of the punch holder 10, and the punch 18 is slidably fitted into the fitting portion 12 of the punch holder 10. A die 38 is placed outside the pipe, and the die and pipe 50 are fixed by a die holder 36 and a mold 40.

The state of the punch section at this time is shown in the partial perspective view of FIG. The cutting edge 19 of the punch 18 is located in substantially the same plane as the outer wall surface of the punch holder 10.

In the state shown in FIG. 5, the operation of each member when pushing the shaft rod 24 inward of the punch holder 10 by pressing force will be explained with reference to FIGS. 6 and 7.

When the shaft rod 24 is pushed into the punch holder 10, the pin 28 moves together with the shaft rod 24.

On the other hand, the engagement hole 22 of the punch 18 is bored at a predetermined angle.

Therefore, the displacement of the shaft rod 24 is converted into the displacement of the punch 18 in the direction perpendicular to the long axis of the punch holder 10, and as shown in FIG. protrudes outward from the outer wall surface by a predetermined length a.

At this time, as shown in FIG. 6, the cutting edge 19 of the punch 18
The hole can be opened by cutting the side wall of the pipe 50 from the inner wall surface to the outer wall surface.

Note that the intersection angle between the long axes of the long holes of the pair of engagement holes 22 provided in the punch 18 and the long axis of the punch holder 10 is determined by the intersection angle of the pin 28 locked in the locking hole 26 of the shaft rod body 24. This is the same as the intersection angle between the long axis of the ellipse that is the cross-sectional shape and the long axis of the punch holder 10.

The intersection angle, the long axis length of the long hole of the engagement hole 22, and the pin 2
The dimension by which the punch 18 protrudes from the outer wall surface of the punch holder AE 0 is determined by the relationship between the lengths of the long axes of the cross-sectional shape of the punch holder AE 8.

Of course, the long axis of the long hole of the engagement hole 22 is longer than the long axis of the cross-sectional shape of the pin 28, and the above-mentioned protruding dimension is determined by the difference.

When the pressing force pushing the shaft rod 24 inward into the punch holder 10 is removed, the shaft rod 24 is returned to its original position by the biasing force of the spring 32 via the interlocking body 30.
The punch returns to its original position even after a day.

In the apparatus of this embodiment, the hole can be drilled simply by pressing the shaft rod 24, so that the hole drilling operation can be performed continuously.

In this embodiment, the case where a substantially rectangular hole is punched has been illustrated and described, but of course, if the shape of the punch is changed, a hole of any shape can be punched.

Furthermore, a hydraulic cylinder or the like may be used for the operation of the cam mechanism of this embodiment, and the power of a hydraulic cylinder or the like can be used for the return mechanism in addition to the spring 32 of this embodiment.

As described above, in the embodiment of the present invention, the cam mechanism constituted by the engagement of the pin 28 and the engagement hole 22 operates the punch 18, but the present invention is not limited to this.

For example, as shown in FIG. 8, it may be a cam mechanism that moves the punch 18 up and down by reciprocating a shaft member 24 having an inclined surface.

Here, FIG. 8(a) shows a state in which the slope of the shaft rod 24 is retreated and the punch 18 is lowered by the urging force of the leaf spring 42, so that the cutting edge 19 is below the surface of the punch holder 19. show.

In contrast to FIG. 8(a), in FIG. 8(b), the slope of the shaft rod 24 is advanced to raise the punch against the biasing force of the leaf spring 42, and the cutting edge portion 19 is shown protruding from the surface of the punch holder 10.

Further, as shown in FIG. 9, by making the portion of the shaft rod 24 that slides with the punch 18 into an inclined portion, a cam mechanism may be used that converts the reciprocating motion of the shaft rod 24 into the vertical movement of the punch 18. .

Here, in FIG. 9(a), the inclined part of the shaft rod body 24 is retreated, the lower surface of the inclined part acts on the punch 18, and the punch 18
is lowered so that the cutting edge 19 is below the surface of the punch holder 10.

In contrast to FIG. 9(a), in FIG. 9(b), the inclined portion of the shaft rod body 24 is advanced, and the upper surface of the inclined portion acts on the punch 18, causing the punch 18 to rise and cut. Blade part 1
9 is shown protruding from the surface of the punch holder 10.

(Effects of the Invention) According to the present invention, since a hole is punched from the inside of the pipe to the side wall of the pipe, no cracks are generated inside the pipe.

Therefore, in a pipe through which a fluid such as a liquid or powder flows, it is possible to reliably eliminate cracks inside the pipe that cause flow resistance.

Further, since the deburr is generated on the outside of the pipe, deburr removal work becomes easier.

Furthermore, since the punch applies pressing force from the inside of the pipe, it is easy to take out the pipe after punching the pipe.

Therefore, the clearance between the diameter of the punch holder and the inner diameter of the pipe can be reduced, and the moment can be kept small, which eliminates strength problems, making it especially suitable for drilling holes in small diameter pipes with long spans. It is.

In addition, since you can use a punch to make holes in the side wall of the pipe, you can make holes of any shape, and
Work easily and efficiently.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an exploded state of an embodiment of the present invention, Fig. 2 is a perspective view illustrating the cam mechanism of the embodiment of Fig. 1, and Fig. 3 is a usage state of the embodiment of Fig. 1. 4th longitudinal cross-sectional view showing
The figure is a cross-sectional view of Figure 3, Figure 5 is a partial perspective view of Figure 3,
6 is a longitudinal sectional view showing the operating condition of the embodiment of FIG. 1, FIG. 7 is a partial perspective view of FIG. 6, FIG. 8 is a sectional view showing another embodiment of the present invention, and FIG. 9 FIG. 3 is a sectional view showing another embodiment of the present invention. IO...Punch holder 12...Fitting part,
14... Shaft passage portion, 17... Dependent clause, 18...
Punch, 19... Cutting blade part, 23... Driving joint,
24... Shaft rod body, 38... Gui, 50...
pipe.

Claims (1)

[Claims] 1. When opening a hole in the side wall of a pipe, a punch holder equipped with a punch movable in a direction perpendicular to the long axis of the pipe is inserted into the inside of the pipe. Next, after fixing the pipe by placing a die corresponding to the punch on the outside of the pipe, move the punch in a direction perpendicular to the long axis of the pipe to cut the cutting edge provided at the tip of the punch. A method for making a hole in a pipe, characterized in that the hole is made to protrude from the inner wall side of the side wall of the pipe toward the outer wall side. 2. In a hole-drilling device for making a hole in the side wall of a pipe, a cylindrical body that can be inserted into the inside of the pipe, and a shaft passage part that is bored along the long axis of the cylindrical body. A punch holder, in which fitting portions are provided orthogonally to each other, and an opening of the fitting portion is opened on the surface of a cylindrical body; and a shaft rod that is slidably inserted into the shaft passing portion of the punch holder. The punch holder is slidably inserted into the insertion part of the punch holder, and is slid in a direction perpendicular to the long axis of the punch holder by sliding the shaft rod inserted into the shaft insertion part of the punch holder. A pipe hole punching device comprising a punch having a cutting edge protruding from an outer wall surface of a moving punch holder.