KR101235827B1

KR101235827B1 - Pipe expanding tool

Info

Publication number: KR101235827B1
Application number: KR1020100107004A
Authority: KR
Inventors: 모리히로 이토; 히로유키 야마우치; 도모아키 호리
Original assignee: 가부시키가이샤 스기노 마신
Priority date: 2010-05-07
Filing date: 2010-10-29
Publication date: 2013-02-21
Also published as: JP2011235298A; KR20110123647A; CN102233388B; CN102233388A; JP5113878B2

Abstract

An object of the present invention is to provide an expansion pipe tool capable of preventing rotation of the member to be expanded and diameter expansion. An expander frame 30 which holds the roller 20 and is rotatably inserted into the tube TU (the tube member); A mandrel 40 inserted into the expander frame 30 and having a tapered portion 41 having a small diameter in the front thereof; The expansion pipe tool 1 provided with the rotation prevention mechanism 50 of the tube TU, The rotation prevention mechanism 50 includes the collar member 51 into which the tube TU is inserted; A jaw 52 disposed in the collar member 51 and advancing in association with the mandrel 40; a tapered portion 51b having a small diameter in the front is formed on the inner circumferential surface of the collar member 51, By advancing the mandrel 40, the jaw 52 is pushed inward in the radial direction by the tapered portion 51 of the collar member 51, and the rollers 41 are tapered by the tapered portion 41 of the mandrel 40. 20) is pushed outward in the radial direction.

Description

Pipe expanding tool

The present invention relates to an expansion tool for expanding the diameter of a member to be expanded from the inside.

Generally in the manufacturing process of heat exchangers, such as a boiler, a capacitor | condenser, and a radiator, as an expansion tool for joining a tube (expansion pipe member) to a tube plate, a tube is press-welded to a tube plate by expanding a tube from inside in the hole part of a tube plate. (For example, refer patent document 1).

In such an expansion tool, a plurality of rollers are rotatably held on a concentric circle, and each roller is pushed outward by advancing the mandrel. Then, the tube is expanded by rolling while each roller presses the inner circumferential surface of the tube.

Patent Document 1: Japanese Patent Application Laid-Open No. 2007-229766

In the above-mentioned conventional expansion pipe tool, when each roller rolls the inner peripheral surface of a tube, there exists a possibility that a tube may rotate together with each roller. Therefore, there is a problem that the operator operating the expansion tool and the operator holding the tube so as not to rotate need to work jointly and the expansion work becomes complicated.

An object of this invention is to provide the expansion tool which can solve the above-mentioned problem, and can prevent rotation of a to-be-expanded member and enlarge a diameter by one.

In order to solve the above problems, the present invention is a cylindrical expander frame rotatably holding a plurality of rollers on a concentric circle, rotatably inserted into the member to be piped; A mandrel slidably and rotatably inserted into the expander frame and having a tapered portion whose front side is a small diameter; An expansion pipe tool comprising: a cylindrical collar member into which the piped member is inserted; A jaw disposed between an inner circumferential surface of the collar member and an outer circumferential surface of the to-be-expanded member, and having a jaw moving forward in conjunction with the mandrel, wherein the inner circumferential surface of the collar member has a tapered portion having a small diameter in front of the collar member. And the mandrel is advanced relative to the collar member and the expander frame such that the jaws are pushed inwards in the radial direction of the collar member by a tapered portion of the collar member, and the jaws contact the outer circumferential surface of the pipe member. In addition, the taper portion of the mandrel is characterized in that the rollers are pushed outward in the radial direction of the expander frame.

In this configuration, by advancing the mandrel, the jaws are in contact with the outer circumferential surface of the member to be piped, the member to be fixed is fixed to the collar member of the fixed system, and each roller is pressed against the inner circumferential surface of the member to be piped. Therefore, it is possible to prevent rotation of the member to be expanded and increase in diameter with one tool, and workability can be improved because there is no need to arrange an operator to hold the member to be rotated so as not to rotate.

In the expansion tool, the rotation preventing mechanism, the clamp frame in contact with the jaw; A cylindrical stopper rotatably holding a rear portion of the mandrel; A first elastic member provided between the collar member and the clamp frame; When it has a 2nd elastic member provided between the said clamp frame and the said stopper; It is preferable to make the elastic force of the said 1st elastic member smaller than the elastic force of the said 2nd elastic member.

In this configuration, when the mandrel and the stopper are advanced, the first elastic member first contracts to move the jaw forward together with the clamp frame, and the member to be piped is fixed by the jaw. Thereafter, the second elastic member contracts and the mandrel is further advanced, whereby each roller can be pressed against the inner peripheral surface of the member to be piped. In this way, since the rotation of the member to be piped is prevented in advance, the rotation of the member to be piped can be reliably prevented.

In the expansion tool, when the first elastic member is provided between the collar member and the rear portion of the clamp frame, and the first elastic member is arranged to surround the outer periphery of the front portion of the expander frame, The space can be effectively used, and the entire tool can be compactly formed.

In the expansion tool of the present invention, since the member to be piped is fixed to the collar member of the fixed system by advancing the mandrel, and each roller is pressed against the inner circumferential surface of the member to be piped, one tool prevents rotation and diameter of the piped member. The workability can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side sectional view which shows the expansion tool of this embodiment.
It is a figure which shows the expansion tool of this embodiment, (a) is AA sectional drawing of FIG. 1, (b) is the figure explaining the feed angle of a roller.
3 is a view showing a state in which the jaw does not contact the tube in the rotation preventing mechanism of the present embodiment, where (a) is a side cross-sectional view and (b) is an axial cross-sectional view.
4 is a view showing a state in which the jaw is in contact with the tube in the rotation preventing mechanism of the present embodiment, (a) is a side cross-sectional view, and (b) is an axial cross-sectional view.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

The expansion tool 1 of the present embodiment includes an expander frame 30 rotatably holding a plurality of rollers 20, a mandrel 40 slidably and rotatably inserted into the expander frame 30, The rotation prevention mechanism 50 of the tube TU is provided.

The expansion pipe tool 1 drives the tube TU from the inside by rolling the rollers 20 against the inner circumferential surface TU1 of the tube TU (“expanded member” in the claims). It is to expand.

In this embodiment, the front end side (left side of FIG. 1) of the expander frame 30 is made to the front, and the base end side (right side of FIG. 1) is demonstrated to the rear.

The expander frame 30 is a cylindrical member inserted into the tube TU. In the front part of the expander frame 30, as shown in FIG.2 (a), three groove part 31 which penetrated from the outer peripheral surface to the inner peripheral surface is formed. Each groove portion 31 is arranged at the same angle pitch (120 degree pitch) in the circumferential direction of the expander frame 30. The roller 20 to be described later is accommodated in each groove portion 31.

In addition, the front surface of the expander frame 30 is formed with a guide surface whose end is narrowed so as to be easily inserted into the opening of the tube TU.

The roller 20 is a cylindrical component for voltage plastic deformation of the tube TU from the inside, as shown in FIG. The taper portion 21 is formed on the outer circumferential surface of the roller 20 so that the front side has a large diameter and the rear side has a small diameter.

The roller 20 is accommodated in the groove part 31 of the expander frame 30, as shown to Fig.2 (a). Therefore, in this embodiment, the three rollers 20 are arrange | positioned at equal angle pitch (120 degree pitch) on concentric circles on the circumference of the expander frame 30. As shown in FIG. The roller 20 held by the groove portion 31 is rotatable and rotatable from the outer circumferential surface of the expander frame 30.

The number and arrangement of the rollers 20 are not limited to the above embodiments, but are appropriately set according to conditions such as the inner diameter and the strength of the tube TU.

As shown in (b) of FIG. 2, the roller 20 has a predetermined feed angle such that the rotating shaft is inclined in a direction (diameter direction) perpendicular to the rotating shaft of the mandrel 40 which will be described later. It is hold | maintained at 30 (refer FIG. 1).

As shown in FIG. 1, the mandrel 40 is a cylindrical member inserted into the expander frame 30 and is slidably and rotatably inserted in the axial direction (front and rear) with respect to the expander frame 30. have.

In the front part of the mandrel 40, the taper part 41 is formed so that a front side may be a small diameter and a back diameter may be a large diameter. The tapered portion 41 is shaped to conform to the tapered portion 21 of the roller 20, so that the tapered portion 21 of the roller 20 and the tapered portion 41 of the mandrel 40 come into contact with each other. Consists of.

In addition, a cap nut 42 is formed at the front of the mandrel 40 to prevent the rear frame from falling out of the expander frame 30.

In the state where the cap nut 42 of the mandrel 40 is in contact with the front part of the expander frame 30 (the state in which the mandrel 40 is not given forward thrust force), the roller 20 is the expander frame 30. Housed in).

Then, as shown in (a) of FIG. 2, when the mandrel 40 is rotated forward (rightward rotation of FIG. 2a), the rotation of the mandrel 40 is transmitted to each roller 20. Each roller 20 rotates while rotating. At this time, since the feed angle is set with respect to the rotation axis of the mandrel 40 in each roller 20, the mandrel 40 is sent to the front by each rotating roller 20. As shown in FIG.

When the mandrel 40 moves forward with respect to the expander frame 30, the taper portion 41 of the mandrel 40 pushes the roller 20 outward in the radial direction of the expander frame 30, and the roller 20. Is pressed against the inner circumferential surface TU1 of the tube TU.

Moreover, when the mandrel 40 is reversely rotated (rotated leftward in FIG. 2A), the mandrel 40 is sent backward by the rollers 20.

In this way, the front part of the mandrel 40 is rotatably supported by the expander frame 30 via each roller 20. On the other hand, the rear part of the mandrel 40 is inserted in the stopper 54 to be described later, and is rotatably held as shown in FIG. 1. Moreover, the rear end 43 of the mandrel 40 is the part which protrudes back from the stopper 54, and is connected with the output part of a drive apparatus (not shown).

As shown in FIG. 1, the anti-rotation mechanism 50 has a collar member 51 into which a tube TU is inserted, a jaw 52 disposed within the collar member 51, and a jaw 52. A clamp frame 53 for supporting and a stopper 54 for rotatably holding the rear portion of the mandrel 40 are provided.

The rotation preventing mechanism 50 is fixed so that the tube TU does not rotate around the shaft by bringing the jaw 52 into contact with the outer circumferential surface TU2 of the tube TU.

The collar member 51 is a cylindrical member and surrounds the outer periphery of the substantially intermediate part of the axial direction of the expander frame 30, and the outer diameter of the rear part 51e is formed larger than the outer diameter of the front part 51d. On the rear part of the inner peripheral surface 51a of the collar member 51, the taper part 51b which becomes small diameter in front, and large diameter in the back is formed.

The inner diameter of the collar member 51 is set so that a gap is formed between the inner peripheral surface 51a of the collar member 51 and the outer peripheral surface TU2 of the tube TU inserted into the collar member 51.

In addition, the front end surface 51f of the front part 51d of the collar member 51 is a site | part which contacts the outer surface of the tube plate P (refer FIG. 3). The area of the front face 51f and the length in the axial direction (front and rear direction) of the front part 51d are the pitch of the arrangement of the hole portions P1 of the tube plate P, and the protrusion of the tube TU from the tube plate P. It is set according to the quantity.

A plurality of jaws 52 are disposed between the inner circumferential surface 51a of the rear portion of the collar member 51 and the outer circumferential surface TU2 of the tube TU.

In the embodiment, as shown in Fig. 3A, three jaws 52 are arranged at the same angle pitch (120 degree pitch) on concentric circles on the inner circumferential surface of the collar member 51. Between each jaw 52, the spacer 52c for maintaining the space | interval of the adjacent jaws 52 and 52 is provided.

In addition, although three jaw 52 is arrange | positioned in this embodiment, the number and arrangement | positioning of the jaw 52 are not limited to the said embodiment, According to conditions, such as the outer diameter and intensity | strength of the tube TU, it sets suitably. do.

The inner surface of the jaw 52 is provided with teeth 52a which mesh with the outer circumferential surface TU2 of the tube TU. Moreover, on the outer surface of the jaw 52, the taper part 52b with which the thickness of a front side is small and the thickness of a back side is large is formed. As shown in Fig. 3A, the tapered portion 52b has a shape coinciding with the tapered portion 51b of the collar member 51 and the tapered portion 52b of the jaw 52. It is comprised so that the taper part 51b of the collar member 51 may contact.

As shown in FIG. 3A, when the jaw 52 is located behind the collar member 51, the jaw 52 is positioned between the teeth 52a of the jaw 52 and the outer circumferential surface TU2 of the tube TU. A gap is formed (see FIG. 3B). As shown in FIG. 4A, when the jaw 52 is advanced in the collar member 51, the jaw 52 is formed by the taper portion 51b of the collar member 51. 51, the tooth 52a of the jaw 52 is engaged with the outer peripheral surface TU2 of the tube TU to be engaged (see FIG. 4 (b)).

The area where the jaw 52 contacts the outer circumferential surface TU2 of the tube TU, that is, the area (width and length in the axial direction) of the inner surface of the jaw 52, each jaw 52 holds the tube TU. When it supports, it changes with length, thickness, etc. of the tube TU so that an excessive load may not act on the tube TU.

As shown in FIG. 1, the clamp frame 53 is a cylindrical member disposed behind the collar member 51, and the expander frame 30 is rotatably inserted therein. The small diameter part 53a is formed in the front part of the clamp frame 53, and the large diameter part 53b is formed in the back part.

Further, at the center of the front end face of the clamp frame 53 (small diameter portion 53a), a protrusion 53e is formed which is in contact with the rear end face of the jaw 52 and can be inserted into the collar member 51.

Thus, when the jaw 52 contacts the front part of the clamp frame 53, it is comprised so that the jaw 52 may move forward with the movement of the clamp frame 53 forward.

A first elastic member 56 is provided between the rear end surface 51c of the collar member 51 (see FIG. 3A) and the large diameter portion 53b of the clamp frame 53.

The 1st elastic member 56 is a coil spring surrounding the outer periphery of the small diameter part 53a (front part) of the clamp frame 53. As shown in FIG. This first elastic member 56 elastically biases the collar member 51 forward with respect to the clamp frame 53.

A cylindrical cover 60 is provided on the outer circumference of the clamp frame 53. It fits in the front part of the cover 60 and the outer side of the back part 51e of the collar member 51, and is fixed to the outer peripheral surface of the collar member 51. As shown in FIG.

The rear portion of the cover 60 is fitted to the outside of the large diameter portion 53b of the clamp frame 53. The clamp frame 53 is slidable in the front-rear direction with respect to the cover 60.

The cover 60 is a member for preventing the first elastic member 56 provided between the collar member 51 and the clamp frame 53 from being exposed to the outside.

In the rear end opening portion of the cover 60, an annular projection 61 protruding radially inward is formed. Moreover, the flange 53c protrudes from the outer peripheral surface of the large diameter part 53b of the clamp frame 53. As shown in FIG. Then, the flange 53c comes into contact with the front surface of the protruding portion 61 to restrict the movement of the clamp frame 53 to the rear.

When the clamp frame 53 is located at the rearmost side, the jaw 52 attached to the clamp frame 53 is disposed at the rear end of the collar member 51.

In the rear part of the cover 60, the front part of the cylindrical spring cover 70 is fitted in the outer side. The spring cover 70 extends rearward from the expander frame 30, and the rear end opening is located at an approximately intermediate portion in the axial direction of the second elastic member 57 to be described later.

The collar member 51, the cover 60, the clamp frame 53, and the spring cover 70 are members of a fixed system that do not rotate in accordance with the rotation of the mandrel 40.

A recess 53d is formed in the center of the rear end surface of the clamp frame 53. In this recessed portion 53d, the front portion 55a of the collar rear wheel 55 is rotatably inserted.

The collar rear wheel 55 is a cylindrical member rotatably mounted in the recessed portion 53d via the ball retainer 55c, and the rear portion of the expander frame 30 is inserted therein.

The rear part 55b of the collar rear wheel 55 is screwed to the screw groove formed in the outer peripheral surface of the rear part of the expander frame 30, and rotates in conjunction with rotation of the expander frame 30. As shown in FIG.

In addition, behind the collar rear wheel 55, the lock nut 55d is screwed into the screw groove of the rear part of the expander frame 30. As shown in FIG.

Then, by rotating the collar rear wheels 55, the collar rear wheels 55 can be forwarded or rearward with respect to the expander frame 30.

In this way, the collar rear wheel 55 is moved with respect to the expander frame 30, and the collar member 51 is sent forward or backward to thereby protrude the roller 20 from the collar member 51 (roller effective). Length) can be adjusted.

The stopper 54 is a cylindrical member having a rear portion of the mandrel 40 inserted therein, and a flange 54a having a diameter enlarged at the rear portion is formed. The stopper 54 rotatably holds the rear portion of the mandrel 40 through a bearing provided therein, and moves in the front-rear direction in association with the movement in the front-rear direction of the mandrel 40.

The second elastic member 57 is provided between the rear end surface of the clamp frame 53 and the flange 54a of the stopper 54. The second elastic member 57 is a coil spring surrounding the outer circumference of the mandrel 40 exposed between the expander frame 30 and the stopper 54.

In this embodiment, the elastic force (spring constant) of the 1st elastic member 56 is set smaller than the elastic force (spring constant) of the 2nd elastic member 57, and the propulsion force toward the stopper 54 was given forward. At this time, the shrinkage amount of the first elastic member 56 is larger than that of the second elastic member 57.

Next, the diameter reduction operation of the tube TU using the expansion pipe tool 1 described above will be described.

First, the lock nut 55d of the expansion tool 1 shown in FIG. 1 is rotated, and the collar rear wheel 55 is sent forward or backward with respect to the expander frame 30, so as to fit the collar in accordance with the length of the enlarged portion. The amount of protrusion (roller effective length) of the roller 20 from the member 51 is adjusted. In addition, the rear end 43 of the mandrel 40 is connected to the output shaft of a power tool (not shown).

As shown in FIG. 3A, the front part of the expander frame 30 is inserted into the tube TU inserted into the hole P1 of the tube plate P, and the front end surface of the collar member 51 ( 51f) is brought into contact with the outer surface of the tube plate P. Thereby, the roller 20 is arrange | positioned in the hole part P1.

When the power tool is driven in this state and the power tool is moved forward while the mandrel 40 shown in FIG. 1 is forwardly rotated, the driving force forward is applied to the mandrel 40 and the stopper 54. Thrust force is transmitted to the clamp frame 53 through the elastic member 57.

At this time, since the elastic force (spring constant) of the first elastic member 56 is smaller than the elastic force (spring constant) of the second elastic member 57, the first elastic member 56 is larger than the second elastic member 57. It contracts greatly, and the clamp frame 53 and the jaw 52 advance.

As shown in FIG. 4A, when the jaw 52 advances in the collar member 51, the jaw 52 is moved by the taper portion 51b of the collar member 51 to the collar member 51. Is pushed inward in the radial direction, and the teeth 52a of the jaws 52 are engaged with the outer circumferential surface TU2 of the tube TU to be engaged (see FIG. 4B). Thereby, the tube TU is fixed to the fixed system (color member 51) via the jaw 52, and rotation of the tube TU is prevented.

When the front end surface of the small diameter portion 53a of the clamp frame 53 contacts the rear end surface of the collar member 51, the advancement of the clamp frame 53 is restricted, and the contraction of the first elastic member 56 is completed. . Thereafter, the second elastic member 57 shown in FIG. 1 contracts so that the mandrel 40 and the stopper 54 are further advanced.

As shown in FIG. 2A, the roller 20 is pushed outwards in the radial direction of the expander frame 30 by the taper portion 41 of the mandrel 40, and each roller 20 is moved. It is pressed by the inner peripheral surface TU1 of the tube TU. At this time, since the rotation of the mandrel 40 is transmitted to each roller 20, each roller 20 revolves, rotating. As a result, the expander frame 30 rotates around the axis.

In this way, the rollers 20 are driven while pressing the inner circumferential surface TU1 of the tube TU, so that the tube TU is expanded from the inside, and the tube TU is the tube plate P (FIG. 4A). Is pressed against the hole P1).

In addition, when the mandrel 40 is separated from the tube TU after the operation, when the power tool is moved backward while the mandrel 40 is reversely rotated, the clamp frame 53 is caused by the elastic force of the first elastic member 56. This is returned to the rear. As a result, the jaw 52 can be retracted in the collar member 51, and as shown in FIG. 3A, the jaw 52 moves outward in the radial direction of the collar member 51. The teeth 52a are spaced apart from the outer circumferential surface of the tube TU.

In the expansion tool 1 as described above, the jaw 52 contacts the outer circumferential surface TU2 of the tube TU by advancing the mandrel 40 as shown in FIG. Is fixed to the collar member 51 of the fixed system, and each roller 20 is pressed against the inner peripheral surface TU1 of the tube TU. Therefore, the rotation of the tube TU can be prevented and the diameter can be increased with one tool, and the workability can be improved because there is no need to arrange an operator to hold the tube TU so as not to rotate.

Further, when the mandrel 40 is advanced, the first elastic member 56 is first contracted to advance the clamp frame 53, and the tube TU is fixed by the jaw 52. Thereafter, the second elastic member 57 shown in FIG. 1 contracts and the mandrel 40 is further advanced, whereby each roller 20 can be pressed against the inner circumferential surface TU1 of the tube TU. As the prevention of rotation of the tube TU is performed in advance in this manner, the rotation of the tube TU can be reliably prevented.

Further, by arranging the first elastic member 56 so as to surround the outer circumference of the small diameter portion 53a (front part) of the clamp frame 53, the space in the tool can be effectively used, and the entire tool can be compactly formed. .

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A change is possible suitably in the range which does not deviate from the meaning.

For example, in the present embodiment, as shown in Fig. 4A, the jaw 52 is configured to be fixed by contacting and engaging the outer circumferential surface TU2 of the tube TU. The jaw 52 may be fixed to the outer tube TU2 of the tube TU to fix the tube TU.

In addition, although the 1st elastic member 56 and the 2nd elastic member 57 are comprised by the coil spring, various elastic members, such as a rubber material, can be used.

1 expansion tool
20 rollers
21 Taper part of roller
30 expander frames
40 mandrel
41 taper of mandrel
50 anti-rotation mechanism
51 color parts
51a inner circumference of the collar member
Tapered part of 51b collar member
52 Ja
52a chibu
52b Jaw Taper
53 clamp frame
53a small diameter
53b large diameter
53d recess
53e protrusion
54 stopper
55 collar rear wheels
55d lock nut
56 first elastic member
57 second elastic member
60 covers
70 spring cover
P tube sheet
P1 hole
TU tube (without pipe)
Inner circumference of the TU1 tube
Circumferential surface of TU2 tube

Claims

A cylindrical expander frame rotatably holding a plurality of rollers on a concentric circle and rotatably inserted into the member to be piped;
A mandrel slidably and rotatably inserted into the expander frame and having a tapered portion whose front side is a small diameter;
An expansion pipe tool, comprising: an anti-rotation mechanism of the pipe member
The rotation prevention mechanism,
A cylindrical collar member into which the member to be piped is inserted;
A jaw disposed between an inner circumferential surface of the collar member and an outer circumferential surface of the member to be piped;
A clamp frame contacting the rear end surface of the jaw;
And a cylindrical stopper rotatably holding a rear portion of the mandrel,
When the mandrel and the stopper are advanced, the stopper pushes the clamp frame so that the jaw advances in conjunction with the mandrel,
On the inner circumferential surface of the collar member, a tapered portion having a small diameter in front is formed,
By advancing the mandrel and the stopper relative to the collar member and the expander frame,
By the taper of the collar member, the jaw is pushed inward in the radial direction of the collar member, and the jaw is in contact with the outer circumferential surface of the member to be piped,
And the taper portion of the mandrel pushes each roller outward in the radial direction of the expander frame.

The method of claim 1,
The rotation prevention mechanism,
A first elastic member provided between the collar member and the clamp frame;
A second elastic member provided between the clamp frame and the stopper;
An expansion force of the first elastic member is smaller than an elastic force of the second elastic member.

The method of claim 2,
And the first elastic member is provided between the collar member and the rear portion of the clamp frame and surrounds the outer circumference of the front portion of the expander frame.