JP2776689B2 - Perforation method for pipe peripheral wall and perforation apparatus used for the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole saw having a cutting tip provided on an end face side of a cylindrical body, which is supported in a cantilevered posture, and which is rotated and fed by the hole saw .
While cutting the pipe peripheral wall in a groove shape with the cutting tip ,
The present invention relates to a method of piercing a peripheral wall of a pipe for forming a through hole in the peripheral wall of the pipe and a piercing apparatus used in the method.

[0002]

2. Description of the Related Art According to the method of drilling a peripheral wall of a pipe, a through hole is formed in the peripheral wall of the pipe by holding the hole saw in a cantilevered posture. It is not necessary to install a jig to support the hole, and the drilling work can be simplified, and the hole can be drilled even when the pipe peripheral wall exists on the rotation axis of the hole saw. There is an advantage that it can be selected and set, but at the beginning of cutting when the cylindrical body is not fitted into the cutting groove formed on the pipe peripheral wall, only the cutting tip
Is fitted into the cutting groove, so the cutting reaction force is hardly offset
In addition, since the hole saw is pivotally supported in a cantilevered position and rotated, the rotation axis of the hole saw tends to run out due to the cutting reaction force. As a result, the preceding cutting tip cuts the cutting groove. In the process, even if the subsequent cutting tip tries to start cutting action along the cutting groove to further cut the cutting groove, the hole saw rotation axis core runs out due to the cutting reaction force by the preceding cutting tip. When the cutting start position of the subsequent cutting tip is shifted from the predetermined starting position in the hole saw radial direction, the cutting load of the subsequent cutting tip increases, and the rotation itself of the hole saw stops, or the hole saw or its rotation There is a problem that a trouble such as breakage due to an abnormal load applied to the drive mechanism occurs and the drilling operation cannot be performed. In particular, the hole saw
When the axis of rotation does not cross at right angles on the axis of the pipe,
Cutting of the peripheral wall of the pipe with the cutting tip of the hole saw
The starting position passes through the pipe axis parallel to the rotation axis of the hole saw.
Direction perpendicular to both the virtual center line and the pipe axis
Rotate and feed the hole saw while it is deviated to the side
When cutting the pipe surrounding wall while moving it,
When the cylindrical body is not fitted into the cut groove
Since the cutting reaction force is hardly offset at the beginning of cutting,
Hole saw rotation axis due to the cutting reaction force by the cutting tip
Is more likely to cause core runout, contributing to the aforementioned troubles.
There is a problem to do. In order to solve this problem, conventionally, when cutting the pipe peripheral wall, a reaction force applying member that applies a reaction force against the cutting reaction force to the hole saw is provided on a lateral side portion of the tube peripheral wall,
A method of perforating while canceling the cutting reaction force has been proposed (for example, see Japanese Patent Publication No. 46758/1994).

[0003]

According to the above prior art, a reaction force applying member is installed at a predetermined position prior to a drilling operation so that only a reaction force against a cutting reaction force can be obtained. When the operation is completed, an operation of removing the reaction force applying member is required separately, and there is a disadvantage that the advantage of simplifying the drilling operation is lost. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and by devising a cutting timing by a cutting tip, while taking advantage of the possibility of simplifying a drilling operation, a problem caused by runout of a hole saw rotary shaft center. It is an object of the present invention to provide a method of piercing a peripheral wall of a pipe and a piercing apparatus used in the method.

[0004]

A feature of the present invention for achieving the above object is that a hole saw provided with a cutting tip on an end face side of a cylindrical body is pivotally supported in a cantilever posture,
Due to the rotation and feeding movement of the hole saw, the pipe peripheral wall
While forming a through hole in the peripheral wall of the pipe while cutting into a groove shape by the cutting tip, wherein at least the cylindrical body fits into a cutting groove formed in the peripheral wall of the pipe. In the cutting step, the cutting groove is cut in a state where two or more cutting tips do not simultaneously perform a cutting operation. Further, the characteristic configuration of the drilling device used for the drilling method of the pipe peripheral wall is such that a hole saw provided with a cutting tip on the end surface side of the cylindrical body is supported in a cantilevered posture, and rotation and feeding movement of the hole saw are performed. Thus , a pipe peripheral wall drilling device for forming a through-hole in the pipe peripheral wall while cutting the pipe peripheral wall into a groove shape with the cutting tip, wherein at least the cylindrical body is formed in the pipe peripheral wall. In the cutting process until the cutting chips are fitted into the cutting grooves, the point is that the cutting chips are arranged so that two or more cutting chips do not simultaneously cut the cutting grooves.

[0005]

[Action] By fitted a cylindrical body for cutting the formed cut grooves in the tube wall at the cutting tip of the hole saw, are regulated deflection core hole saw rotational axis, while smoothly rotated and feed movement hole saw The through-hole is formed by cutting, and the cutting tip is provided with its cutting edge protruding from the end face of the cylindrical body toward the surface to be cut, and after starting the cutting operation, at least the cutting tip of the cutting tip is provided. In the cutting process until a cutting groove with a depth corresponding to the amount of protrusion protruding from the end face of the cylindrical body is formed, the cylindrical body is not fitted in the cutting groove, and the rotation axis of the hole saw is It is in a state where it is easy to shake,
At least in the cutting process until the cylindrical body fits into the cutting groove, the cutting groove is cut in a state where two or more cutting tips do not simultaneously perform a cutting action. Even if the rotation axis of the rotary shaft causes the runout, the cutting start position of the subsequent cutting tip is unlikely to deviate from the predetermined start position. In other words, until one cutting tip finishes cutting the cutting groove, the cutting action of the cutting groove by the other cutting tip does not start. Even if the center run-out occurs, when the one cutting tip finishes the cutting action of the cutting groove, the center run-out is eliminated, and the cutting action of the cutting groove by the subsequent cutting tip is started in a state where the center run-out has been eliminated. That is, the cutting start position of the subsequent cutting tip is unlikely to deviate from the predetermined start position.

[0006]

In each of the method for piercing the peripheral wall of the pipe according to the first aspect and the piercing apparatus according to the second aspect, the center axis of the hole saw rotating shaft is caused by the cutting reaction force by the preceding cutting tip. However, since the cutting start position of the subsequent cutting tip is unlikely to deviate from the predetermined starting position, there is little risk that the cutting load of the subsequent cutting tip will increase, and moreover, prior to the conventional drilling operation, the reaction force applying member or the like must be repaired. Since it is not necessary to install the tool and remove the jig when the drilling work is completed, it is possible to simplify the drilling work, while taking advantage of the possibility of simplifying the drilling work, due to the runout of the hole saw rotary shaft center The rotation of the hole saw stops itself,
It is possible to solve the problem that the hole saw or its rotary drive mechanism is damaged due to an abnormal load and the drilling work cannot be performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 4, a connection case 1 is mounted and fixed on the outer peripheral surface of a fluid (tap water) transport pipe A with a packing P therebetween as shown in FIGS. Along with forming a cylindrical closed space C, a branch port 2 as a through hole communicating the inside of the fluid transport tube A with the closed space C is formed in the peripheral wall of the fluid transport tube A from the closed space C side,
The connection case 1 is provided with a connection pipe D for connecting the end of another fluid (tap water) transport pipe B to the closed space C so as to connect the two fluid transport pipes A and B to a continuous water state (flow of water). The branch piping method for communicating and connecting in a state where the pressure is maintained will be described. The punching device for forming the branch port 2 is shown in FIGS.
As shown in the figure, a cylindrical work case 3 communicating with the inside of the closed space C is flange-connected to the upper end of the connection case 1, and the work case 3 is supported by a drive rotary shaft 4 in a cantilever manner in a hole saw. 5 inside. The working case 3 is configured by detachably connecting a first cylindrical case 3A having a gate valve 6 and a second cylindrical case 3B capable of accommodating the hole saw 5 by a flange, and one end of the first cylindrical case 3A. The side is detachably connected to the connection case 1 by a flange, and a lid plate 3C is detachably connected to one end of the second cylindrical case 3B by a flange. The drive rotation of the hole saw 5 is attached to the lid plate 3C. The shaft 4 is slidably penetrated vertically in a watertight state. With the hole saw 5 through the holder 10 are connected by a detent state to the drive-rotation shaft 4 is its end, the drive rotary shaft
4, in a state where the working casing 3 is connected connected to the connection case 1, in the direction perpendicular to the pipe axis X of the fluid transport pipe A, and the rotation axis Y which does not intersect on the tube axis X The drive rotary shaft 4 is rotatably supported around the cover plate 3C.
By driving the first motor M1 fixed to the side and rotating clockwise in a plan view while driving the second motor M2, the drive rotary shaft 4 is slid downward along the rotation axis Y to form the second motor M2. The working case 3 and the connection case 1 are rotated while the hole saw 5 located in the cylindrical case 3B rotates.
Insertion movement, i.e. in the connection case 1 through a connection portion between the
The fluid transport pipe A is fed and moved, and the peripheral wall of the fluid transport pipe A on one side is cut to form the branch port 2. The hole saw 5 has four cutting tips 7 on the end face of a cylindrical body 8 and
The cutting edge protrudes from the end face of the cylindrical body 8 toward the outer surface of the pipe peripheral wall.
It is configured to be fixed in a protruding state, and the peripheral wall of the pipe is cut by the cutting tip 7 by rotation and feeding movement of the hole saw 5 .
The cylindrical body 8 fits into the cutting groove 9 formed on the peripheral wall of the tube while being cut in a groove shape, thereby controlling the runout of the rotation axis Y of the drive rotation shaft 4 and cutting the work. In the cutting step at least until the cylindrical body 8 fits into the cutting groove 9 from the start, as shown in FIG. 2 so that two or more cutting tips 7 do not simultaneously cut the cutting groove 9. The cutting tips 7 are arranged and fixed at a 90 ° phase angle. The holder 10 is provided with a cylindrical shaft member 12 screwed and fixed to the top plate 11 of the cylindrical body 8 and a fixed shaft 13 for connecting and fixing the cylindrical shaft member 12 and the driving rotary shaft 4. Member 12
The end of the fixed shaft 13 inserted into the
The hole saw 5 and the drive rotary shaft 4 are detachably connected by sandwiching the cylindrical shaft member 12 screwed to the top plate 11 between the flange 14 formed on the fixed shaft 13 and the drive rotary shaft 4, and By engaging the opposing surfaces of the cylindrical shaft member 12 and the drive rotary shaft 4 with each other, the drive rotary shaft 4 and the hole saw 5 are connected in a detented state. The fixed shaft 13
To the lower end, is connected shaft 16 extends that is formed a cylindrical shaft portion 15, as shown in FIG. 3, after the end of the drilling operation, feed moves further down direction together with the connecting shaft 16 the hole saw 5 < By moving, the collection member 17 previously mounted on the inner bottom surface of the connection case 1 and the cylindrical shaft portion 15 are engaged and connected,
A cut piece 1 of the pipe peripheral wall generated by the formation of the branch port 2
8 is confined on the inner peripheral surface side of the cylindrical body 8,
The cut piece 18 is collected together with the hole saw 5 in the second cylindrical case 3B of the working case 3 by the upward movement of the hole saw 5. The collecting member 17 is formed by projecting an engaging shaft member 20 at the center of a circular plate 19 having a diameter slightly smaller than the outer diameter of the cylindrical body 8, and is biased to protrude toward the rotation axis Y. The engaging pin 21 is provided on the cylindrical shaft portion 15,
As the cylindrical shaft portion 15 is externally fitted to the distal end portion of the engaging shaft member 20 by the downward movement of the connecting shaft 16, the engaging pin 21 engages with the circumferential groove 22 of the engaging shaft member 20, and the connecting shaft 16 The engagement shaft member 20 is engaged with the connection shaft 16 by pulling the engagement pin 21 through a light hole 23 formed in the cylindrical body 8 against the urging force. Shaft member 2
It is configured so that the engagement connection with 0 is released. The movement of the collection member 17 in the radial direction is restricted by the contact between the peripheral surface of the disk 19 placed on the inner bottom surface of the connection case 1 and the inner surface of the connection case 1. Connecting shaft 16
The cylindrical shaft portion 15 at the distal end is formed so that the inner peripheral surface on the distal end side expands in a trumpet shape, and the cylindrical shaft portion 15 is securely fitted to the engaging shaft member 20 as the hole saw 5 moves down. It is configured to be able to do.

Next, a description will be given of an operation procedure for branch-connecting another fluid transport pipe B to the fluid transport pipe A in a water-free state. As shown in FIG. 5, the connection case 1 on which the collection member 17 is mounted on the inner bottom surface is attached to the fluid transport pipe A, and the connection case 1 is different from the work case 3 in which the hole saw 5 is provided. Connect to fluid transport pipe B. As shown in FIGS. 1, 3, and 6, the hole saw 5 is inserted and moved into the connection case 1 while rotating, the peripheral wall of the fluid transport pipe A is cut, and the cutting waste is put into the connection case 1 together with tap water. The branch port 2 is formed while discharging from the drain hole 24 provided. In this cutting step, the rotation of the hole saw 5 causes the cylindrical body 8 of the hole saw 5 to fit into the cutting groove 9 formed in the peripheral wall of the pipe, thereby restricting the runout of the rotation axis Y of the drive rotation shaft 4. As shown in FIG. 1, in the cutting step from the start of cutting by the hole saw 5 to at least the fitting of the cylindrical body 8 into the cutting groove 9, in a state where two or more cutting tips 7 do not simultaneously perform cutting, The cutting groove 9 is cut. As shown in FIGS. 3 and 7, the hole saw 5 is further moved downward to connect the hole saw 5 and the collecting member 17 to the connecting shaft 1.
After the cut piece 18 is held in the hole saw 5, the hole saw 5 is moved upward into the second cylindrical case 3B, and then the gate valve 6 is closed. The cover 3C and the hole saw 5 together with the second cylindrical case 3
B, a cover 25 for closing the connection port of the connection case 1 is attached to the drive rotary shaft 4 in place of the hole saw 5 holding the cut piece 18 as shown in FIG. After re-fixing to the cylindrical case 3B, the gate valve 6 is opened,
The drive rotary shaft 4 is moved downward to insert the cover 25 into the connection port of the connection case 1, and the cover 25 is temporarily fixed to the connection case 1 with the temporary fixing bolt 26 so that the cover 25 does not come out of the connection port due to the pressure in the connection case 1. . After releasing the connection between the drive rotary shaft 4 and the lid 25 and removing the work case 3 from the connection case 1, the lid 25 is fixed to the connection case 1 by a ring 27 as shown in FIG. Close 24.

[Other Embodiments] The method for piercing the peripheral wall of a pipe according to the present invention and the piercing apparatus used in the method are not limited to the case of forming a through-hole in the peripheral wall of a pipe through which water flows, but also for any liquid or liquid. The present invention can also be applied to a case where a through hole is formed in the peripheral wall of a pipe through which gas flows. The method for piercing the peripheral wall of the pipe according to the present invention and the piercing apparatus used in the method are not limited to the case where the through-hole is formed in the peripheral wall of the pipe in the non-disrupted state (while maintaining the flow of the fluid), and the flow of the fluid It can also be used when a through hole is formed in the peripheral wall of the pipe in a stopped state. The method for piercing a peripheral wall of a pipe according to the present invention and the piercing apparatus used in the method cut a cutting groove in a state where two or more cutting tips do not simultaneously perform a cutting operation even after a cylindrical body is fitted in the cutting groove. You may comprise so that it may be. A method for piercing a peripheral wall of a pipe according to the present invention and a piercing apparatus used in the method are for forming a through hole in the peripheral wall of a pipe using a hole saw provided with only one cutting tip on an end face side of a cylindrical body. May be. The method for piercing a peripheral wall of a pipe according to the present invention and the piercing apparatus used in the method are characterized in that at least in a cutting step until the cylindrical body fits into the cutting groove, the cutting groove is formed in a state where two or more cutting tips do not simultaneously perform a cutting operation. The number of cutting tips provided on the end face side of the cylindrical body is not particularly limited as long as the cutting tips are arranged so as to be capable of cutting. It should be noted that, depending on the outer diameter of the pipe in which the through hole is to be formed and the diameter of the hole saw used, 4 to 6 cutting tips are arranged and fixed at equal intervals to smoothly cut the through hole. A hole saw is most desirable. A method of piercing a pipe peripheral wall according to the present invention and a piercing apparatus used in the method, wherein a hole saw is rotated around a rotation axis in a direction intersecting at an acute angle to the pipe axis to form a through hole in the pipe peripheral wall. It may be. The method for piercing the peripheral wall of a pipe according to the present invention and the piercing apparatus used in the method may be one in which a hole saw is fed manually during cutting.

[0010] In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a cutting process before a cylindrical body is fitted into a cutting groove.

FIG. 2 is a front view showing an end face of the hole saw.

FIG. 3 is a longitudinal sectional view showing a process of collecting cut pieces.

FIG. 4 is a schematic sectional view showing a pipe connection state.

FIG. 5 is a longitudinal sectional view showing a schematic process of a pipe connection operation.

FIG. 6 is a longitudinal sectional view showing a schematic process of a pipe connection operation.

FIG. 7 is a longitudinal sectional view showing a schematic process of a pipe connection operation.

FIG. 8 is a longitudinal sectional view showing a schematic process of a pipe connection operation.

FIG. 9 is a longitudinal sectional view showing a schematic process of a pipe connection operation.

[Explanation of symbols]

2 Through-hole 5 Hole saw 7 Cutting tip 8 Cylindrical body 9 Cutting groove

Claims (2)

(57) [Claims] 1. A hole saw (5) provided with a cutting tip (7) on an end face side of a cylindrical body (8) is pivotally supported in a cantilevered posture, and the hole saw (5) is rotated and fed.
With the movement , the pipe peripheral wall is formed into a groove shape by the cutting tip (7).
A drilling method for forming a through hole (2) in the peripheral wall of a pipe while cutting , wherein at least the cylindrical body ( 8 ) is fitted into a cutting groove (9) formed in the peripheral wall of the pipe. In the cutting step of (1), a method of perforating a pipe peripheral wall for cutting the cutting groove (9) in a state where two or more cutting tips (7) do not simultaneously perform a cutting operation. 2. A hole saw (5) provided with a cutting tip (7) on an end face side of a cylindrical body (8) is pivotally supported in a cantilevered posture, and the hole saw (5) is rotated and fed.
With the movement , the pipe peripheral wall is formed into a groove shape by the cutting tip (7).
A drilling device for forming a through hole (2) in the peripheral wall of the pipe while cutting , wherein at least the cylindrical body (8) is fitted into a cutting groove (9) formed in the peripheral wall of the pipe. In the cutting step, the cutting tip (7) is arranged so that two or more cutting tips (7) do not simultaneously cut the cutting groove (9).