JP2625515B2 - Pipe end correction tool - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe end correcting tool used for correcting a deformed pipe end such as a copper pipe or a resin-coated aluminum pipe into an original cylindrical shape. . More specifically, a rotating operation portion is formed at the base end of a pipe correcting portion that can be inserted into and removed from the pipe end from the pipe axis direction, and the pipe correcting portion has a width substantially equal to the inner diameter of the pipe, and And a pipe end correcting tool having a thickness smaller than the width thereof.

[Conventional technology]

Conventionally, in this kind of pipe end correction tool, the pipe correction section is
Along with a plate-like body formed to have substantially the same width as the inside diameter of the pipe, the distal end portion of the pipe correction section is formed in a tapered shape closer to the pipe axis toward the distal end, so that the pipe correction section is formed. By rotating the pipe correcting section with the rotary operation section while inserting the pipe section into the deformed pipe end, the deformed pipe end is configured to be corrected to the original cylindrical shape (for example, actual 62-92121).

[Problems to be solved by the invention]

In the case of the conventional pipe end correcting device, since the pipe correcting portion is formed of a plate-like body having a substantially rectangular cross section,
By matching the major axis direction of the tube end deformed into the elliptical shape with the width direction of the tube correcting portion, the tube correcting portion can be freely inserted to an arbitrary depth position in the tube end. Therefore, since the pipe end can be corrected only by inserting and rotating the pipe correction portion at a predetermined position in the pipe end,
For example, as compared with a correction tool in which the pipe correction section is formed of a cylindrical body having substantially the same diameter as the pipe inner diameter, and the tip of the pipe correction section is strongly pushed into the pipe end while rotating from the pipe axis direction. The tube end can be efficiently corrected with a small operation force. On the other hand, at the time of correcting the pipe end, only the two sides of the pipe correction section are in contact with the inner circumferential surface of the pipe, so that the rotation operation of the pipe correction section around the pipe axis tends to be unstable. However, the roundness of correction at the end of the tube has been reduced due to the displacement of the operation shaft axis from the tube axis.

In addition, such a displacement of the pipe correction portion from the pipe axis tends to cause twisting, and the rotation operation of the pipe end correction tool may require much labor. In particular, in this kind of pipe end correction work, it is common sense to work while wearing gloves from the viewpoint of safety, and in this state, if the above-described scuffing occurs, the pipe end correction tool, the rotation operation unit, and the like. The rotation operation itself could not be performed due to slipping with gloves.

Therefore, when such a rotation-impossible situation occurs, it is necessary to remove the gloves and rotate the pipe end correction tool, but if the gloves are removed one by one, the workability becomes very poor, and Since it is not preferable in terms of safety, generally, even if the roundness of correction at the pipe end is slightly sacrificed, the width of the pipe correction section is configured to be slightly smaller than the inner diameter of the pipe to reduce the rotational operation force. That is the current situation.

An object of the present invention is to operate a deformed tube end with a small operation force.
In addition, the point is that correction can be efficiently performed with high roundness.

[Means for solving the problem]

The pipe end correcting device according to the present invention is provided with an auxiliary pipe correcting portion having a maximum width portion that is the same as or slightly smaller than the maximum width portion of the pipe correcting portion at a position different from the pipe correcting portion in the pipe circumferential direction. In the tube axis direction, the distal end portion of the maximum width portion of the auxiliary pipe correction portion is disposed closer to the base end side than the distal end portion of the maximum width portion of the pipe correction portion. The functions and effects of the above are as follows.

(Operation)

When a circular section is collapsed by cutting or the like, for example, to correct a pipe end deformed into an elliptical shape, first, while inserting only the tip end of the pipe correction section into the pipe end, rotate the rotation operation section. By using a large moment determined by the distance from the portion corresponding to the pipe axis of the rotary operating portion to the pipe correcting action surface and the rotary operating force, a narrow portion of the pipe end portion that is crushed in the radial direction is used. Can be smoothly expanded and deformed radially outward.

When the pipe end is corrected to a substantially original cylindrical shape by such expansion deformation, the entire correction tool is further pushed into the inner side of the pipe end, and the pipe correction section is further moved in the pipe axis direction. After inserting the auxiliary pipe correcting portion provided in a state where the distal end portion of the maximum width portion of the auxiliary pipe correcting portion is located closer to the base end side than the distal end portion of the maximum width portion into the pipe end portion, the rotation operating portion To rotate. At this time, the tip of the maximum width portion of the auxiliary pipe correction portion is the same as or slightly smaller than the maximum width portion of the pipe correction portion. Under the condition of the position, at the same time, the tip portions are provided at different positions in the circumferential direction of the pipe, so that both the pipe correcting action surfaces of the pipe correcting section and the pipe correcting action surface of the auxiliary pipe correcting section are substantially the same. Since the tube correcting portion and the auxiliary tube correcting portion rotate while sliding simultaneously on the inner peripheral surface of the tube end portion corrected into a cylindrical shape, the movement of the pipe correcting portion and the auxiliary pipe correcting portion from the pipe axis is changed by each of these tip portions and the pipe inner peripheral portion. Mutual regulation can be achieved by contact with the surface.

Also, under the condition that the tip of the maximum width portion of the auxiliary pipe correction portion is located on the circumference of a radius slightly smaller than the maximum rotation radius around the pipe axis of the pipe correction portion, at the same time, the tip portions thereof Are provided at different positions in the circumferential direction of the pipe, so that only the pipe correcting action surface of the pipe correcting portion contacts the inner circumferential surface of the pipe end,
Since the maximum width portion of the auxiliary pipe correcting portion rotates in a state of being extremely close to the inner peripheral surface of the pipe end portion, while further correcting the pipe end portion only by the pipe correcting portion, the The displacement from the pipe axis can be restricted by the contact between the maximum width portion of the auxiliary pipe correcting portion and the inner peripheral surface of the pipe.

Therefore, under any conditions, the operating rotation axis of the correction tool is automatically aligned on the pipe axis, and as a result, the pipe end is corrected to a perfect circular shape with a small operating force. .

〔The invention's effect〕

Therefore, by the correction step by the pipe correction section and the correction step by the pipe correction section and the auxiliary pipe correction section, the pipe end which is largely deformed in the radial direction by cutting as a whole can be efficiently corrected with a small operation force. Thus, the correction roundness of the pipe end can be increased as compared with the related art.

In particular, in the case of the latter condition, there is an effect that the operating force required for the correction can be further reduced while the correction is made with the same high roundness as the case of the former condition.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 4 show an example of a pipe end correcting tool of the present invention for correcting a pipe end (P) deformed by cutting or the like into an original cylindrical shape, which is a pipe end (P). On the other hand, at the base end of the pipe correcting section (1) which can be inserted and removed from the pipe axis direction, a substantially hollow disk-shaped rotary operating section (2) having a diameter larger than that of the pipe correcting section (1). ) Are provided continuously, and a maximum radius of rotation of the pipe correcting portion (1) around the pipe axis is located closer to the base end than the distal end of the pipe correcting portion (1) in the pipe axis direction. A pair of auxiliary pipe correction parts (3), (3) whose tip parts are located on the circumference of the same radius are continuously provided.

The pipe correcting portion (1) is formed of a plate-like body having a width substantially equal to the inner diameter of an undeformed portion of the pipe and having a thickness considerably smaller than the width.

Reinforcing ribs (1) extending from the base end to the distal end are provided at the center positions in the width direction on both sides of the pipe correcting portion (1).
a) and (1a) are integrally formed, and both sides of the pipe correcting portion (1) are formed on pipe correcting action surfaces (1b) and (1b) having a semicircular cross-sectional shape, respectively. I have.

The distal end side of each of the pipe correction action surfaces (1b), (1b) is formed in a tapered shape such that the distal end is closer to the pipe axis.

A chamfering blade (4) for removing burrs of the pipe end (P) generated by cutting with a screw (5) is attached to the base end of one side surface of the pipe correcting section (1). The mounting surface (1c) is recessed.

Each of the auxiliary pipe correction sections (3) and (3) is formed of a plate-like body similarly to the pipe correction section (1). Outer sides of these auxiliary pipe correcting portions (3) and (3) are formed as pipe correcting action surfaces (3a) and (3a) having a semicircular cross-sectional shape, respectively. The distal ends of (3a) and (3a) are formed in a tapered shape such that the closer to the distal end, the closer to the tube axis.

In addition, the auxiliary pipe correcting portions (3) and (3) have the mounting surface (1c) for a chamfering blade formed on the pipe correcting portion (1), and therefore, the auxiliary pipe correcting portions (3) and (3) are located above the pipe shaft center. It is connected to a part slightly displaced to the side opposite to the side where the chamfering blade (4) exists.

The outer peripheral surface of the rotary operation part (2) is subjected to knurling for slip prevention.

When correcting the deformed pipe end (P) using the pipe end correcting tool configured as described above, first, only the distal end of the pipe correction section (1) is connected to the pipe end (P). ), While rotating the rotary operation part (2), the distance from the portion corresponding to the pipe axis of the rotary operation part (2) to the pipe correction action surfaces (1b) and (1b) is reduced. By utilizing a large moment determined by the rotational operation force, the narrow portion of the pipe end (P) can be smoothly expanded and deformed radially outward.

When the pipe end (P) is corrected to a substantially original cylindrical shape by such expansion deformation, the entire correction tool is then pushed toward the pipe end (P) to perform the pipe correction section (P). After the auxiliary pipe correcting portion (3) provided on the base end side of 1) is also inserted into the pipe end portion (P), the rotary operation portion (2) is rotated. In this state, the pipe end (P) is corrected to be substantially the original cylindrical shape, and the two pipe correction action surfaces (1b) and (1b) of the pipe correction part (1) and the auxiliary pipe correction part are changed. Since the pipe correcting action surface (3a) of (3) rotates simultaneously with the inner circumferential surface of the pipe end (P) on the same circumference while rotating, the operating rotation axis of the correction tool is on the pipe axis. Self-alignment is performed, and as a result, the pipe end (P) is corrected to a perfect circular shape with a small operation force.

When the correction operation is completed, the entire correction tool is further pushed into the pipe end (P) side, and burrs generated on the cut surface of the pipe end (P) are removed by the chamfering blade (4). Remove.

 Next, another embodiment will be described.

[I] In the above-described embodiment, the auxiliary pipe correcting section (3) is provided at right angles to the pipe correcting section (1) at a position slightly displaced from a position corresponding to the pipe axis. However, as shown in FIG. In addition, the auxiliary pipe correcting section (3) may be connected to the pipe correcting section (1) at a position corresponding to the pipe axis at a right angle, and may be implemented.
As shown in FIG. 6, the auxiliary pipe correcting portion (3) may be continuously connected in an X shape at a position corresponding to the pipe axis of the pipe correcting portion (1). Further, as shown in FIG. 7, the auxiliary pipe correcting portion (3) may be connected in a V-shape at a position corresponding to the pipe axis of the pipe correcting portion (1).

[II] In the above-described embodiment, both the pipe correcting section (1) and the auxiliary pipe correcting section (3) are formed of plate-like bodies. However, as shown in FIG. The auxiliary pipe correcting section (3) may be implemented by both being constituted by a rod-shaped body.

[III] Also, as shown in FIG. 9, the pipe correcting section (1) has a dimension slightly longer than the distance from the base end side of the pipe correcting section (1) to the center in the pipe axis center direction. A first auxiliary pipe correction part (3) and a second auxiliary pipe correction part (3) having a dimension slightly shorter than a distance from a base end side of the pipe correction part (1) to a center part in a pipe axis direction. A configuration may be adopted in which the pipe ends (P) are corrected in three stages by connecting them in pairs.

[IV] Further, as shown in FIG. 10, the pipe correcting section (1)
Is made of a plate-like body having a width substantially equal to the inner diameter of the pipe and having a thickness smaller than that width, and the base of the pipe correction section (1) is provided with the pipe correction section (1). Slightly smaller than the maximum rotation trajectory around the pipe axis (for example, 0.5 mm
A pair of plate-shaped auxiliary pipe correcting portions (3) in which the distal end portion (3b) of the maximum width portion is located on the circumference may be continuously provided.

When correcting the deformed pipe end (P) using the pipe end correcting tool of this embodiment, first, the pipe correcting section (1)
By rotating the rotary operation part (2) while inserting only the tip part of the pipe into the pipe end part (P), the pipe correcting action surface ( 1b),
By utilizing a large moment determined by the distance to (1b) and the rotational operation force, the narrow portion of the pipe end (P) can be smoothly expanded and deformed radially outward.

When the pipe end (P) is corrected to a substantially original cylindrical shape by such expansion deformation, the entire correction tool is then pushed toward the pipe end (P) to perform the pipe correction section (P). After inserting the auxiliary pipe correcting section (3) provided on the base end side of 1) into the pipe end section (P), the circuit operation section (2) is rotated.
In this state, the pipe correction operation surface (1
Only b) and (1b) are in contact with the inner peripheral surface of the pipe end (P), and the tip (3b) of the maximum width portion of the auxiliary pipe correcting portion (3) is the inner peripheral surface of the pipe end (P). Since the pipe end (P) is further corrected only by the pipe correction section (1), the displacement of the pipe correction section (1) from the pipe axis at this time is It can be regulated by the contact between the distal end (3b) of the auxiliary pipe correcting section (3) and the inner peripheral surface of the pipe.

Therefore, the pipe correcting section (1) always performs the pipe end correcting action, and the auxiliary pipe correcting section (3) performs only the centering action for producing a perfect circle. Can be corrected with the same high roundness as the above-described embodiment, but the operating force required for the correction can be further reduced.

[V] In the above-described embodiment, the length of the tube correcting action surface (3a) of the auxiliary pipe correcting portion (3) in the pipe axis direction is determined from the tube correcting action surface (1b) of the pipe correcting portion (1). The auxiliary pipe correcting section (3) is also connected to the fixed end of the pipe correcting section (1), but the auxiliary pipe correcting section (3) is connected to the pipe axis of the pipe correcting section (1). It may be implemented continuously at the middle part in the direction.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

1 to 4 show an embodiment of a pipe end correcting tool according to the present invention. FIG. 1 is an overall side view, FIG. 2 is an overall front view, FIG. 3 is an overall plan view, FIG. 4 is a sectional view taken along the line IV-IV of FIG. 5 to 7 are cross-sectional views of main parts showing different embodiments, FIG. 8 is a perspective view of the whole showing another embodiment, and FIG. 10 is a perspective view of another embodiment. It is sectional drawing of the principal part shown. (P) ... pipe end, (1) ... pipe correction part, (2) ... rotation operation part, (3) ... auxiliary pipe correction part, (4) ... chamfering blade, (1c) ... ... Mounting surface.

Claims (5)

(57) [Claims] 1. A rotary operation part (2) is formed at the base end of a pipe correcting part (1) that can be inserted into and removed from the pipe end part (P) from the axial direction of the pipe. ) Is a pipe end correcting tool having a width substantially equal to the inner diameter of the pipe and a thickness smaller than the width, wherein the tool is the same as or slightly larger than the maximum width of the pipe correcting section (1). An auxiliary pipe correcting section (3) having a small maximum width portion is provided at a position different from the pipe correcting section (1) in the circumferential direction of the pipe, and the auxiliary pipe correcting section (1) is arranged in the pipe axis direction. A pipe end correcting tool, wherein a distal end of the maximum width portion of the auxiliary pipe correcting portion (3) is disposed closer to a proximal end than a distal end of the large portion. 2. The pipe end correcting tool according to claim 1, wherein the front end of the pipe correcting portion is formed in a tapered shape such that the front end portion is closer to the pipe axis. 3. A pipe end correcting tool according to claim 1, wherein said pipe correcting portion (1) has a mounting surface (1c) for a chamfering blade (4) on a base end side thereof. 4. The pipe correction section (1) and the auxiliary pipe correction section (3) are both formed of a plate-like body.
The pipe end correcting device according to any one of the above. 5. The pipe correction section (1) and the auxiliary pipe correction section (3) are both formed of rods.
The pipe end correcting device according to any one of the above.