JPH0116213B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention mainly relates to expanding a tube using a mandrel in order to fix a large number of fins and the tube when manufacturing a fin tube for a heat exchanger. This invention relates to a tube expansion device applied to.

(Prior Art) Conventionally, this type of pipe expansion device uses a reciprocating body 1 that can be raised and lowered by a cylinder or the like, as shown in FIG.
A plurality of mandrels 41 are attached to the bottom of the tube 50, and the mandrels 4 are placed in a tube 50 set below the mandrels 41.
There is one that press-fits 1.

Conventionally, as a means for attaching the mandrel 41 to the reciprocating body 1e, a plurality of holes 8 are bored in the lower surface of the reciprocating body 1e as shown in FIG.
The head of the mandrel 41 was fitted into the head of the mandrel 41, and the ball 83, etc., biased by a spring 82 was engaged with a groove 81 formed in the head, thereby fixing the mandrel 41.

(Problem to be Solved by the Invention) However, in the conventional system, when there is a change in the number or position of pipes to be expanded, the mandrel 4 attached to the reciprocating body 1e is adjusted accordingly.
The number and position of 1 must also be changed. That is, in the conventional type, it is necessary to change the arrangement of the mandrels by attaching and detaching a large number of mandrels 41 from the reciprocating body 1e each time the arrangement of the tubes to be expanded is changed.

As a result, the mandrel setup change work is very complicated and takes a long time, resulting in a problem that the workability is very poor. In particular, the mandrel 41 commonly used in this type of pipe expansion work is quite long and difficult to handle, making the problem regarding workability very serious.

Furthermore, conventionally, in order to easily attach and detach the mandrel 41, a locking means of a ball 83 biased by a spring 82 is used.
Considering that it is necessary to provide the same number of devices, the structure is extremely complicated, and there are also difficulties in manufacturing it.

Therefore, an object of the present invention is to simplify the setup work when there is a change in the arrangement of pipes to be expanded, and to simplify the equipment configuration for attaching a large number of mandrels. be.

(Means for Solving the Problems) The present invention does not involve sequentially attaching and detaching mandrels to and from a reciprocating body according to the arrangement of the pipes to be expanded, as in the past, but the present invention is designed to provide a method that allows the mandrels to be attached to and removed from the reciprocating body one by one depending on the arrangement of the pipes to be expanded to be expanded. This device is designed to solve the above-mentioned conventional problems by simply pressing only desired mandrels.

That is, the present invention provides a mounting plate 6 in which a plurality of through holes 7 are formed in a reciprocating body 1 for reciprocating a plurality of mandrels 41 to face a pipe 50 to be expanded, and the mounting plate In each of the through holes 7 of 6, a mandrel 41 having a locking step portion 42 having a larger diameter than the mandrel shaft portion on the head thereof can be freely slid so as to protrude toward the back side of the mounting plate 6, and the locking step portion 42 can be freely slid to protrude toward the back side of the mounting plate 6. The mandrel 41 is inserted through the engagement of the stopper step 42 and the mounting plate 6 to prevent it from coming off toward the distal end side.Moreover, on the back side of the mounting plate 6, there is a hole at the position of the mandrel 41 used for pipe expansion. Correspondingly, a mounting cavity 8 is provided for removably mounting a pressing attachment 43 formed with a pressing surface 44 for pressing the head of the mandrel 41.
It is a tube expansion device.

(Function) Therefore, in the tube expansion device characterized by the above configuration, the pressing attachment 43, which has a pressing surface 44 formed corresponding to the position of the mandrel 41 used for tube expansion, is attached to the back side of the mounting plate 6. Empty part 8 for mounting
The reciprocating body 1 is attached to the pipe 50 for pipe expansion.
When operated to the side, only the mandrels 41 necessary for pipe expansion among the plurality of mandrels 41 inserted through the plurality of through holes 7 of the mounting plate 6 are pressed by the pressing surface 44 of the pressing attachment 43 and moved forward. It will be done. On the other hand, the mandrel 41, which is unnecessary for pipe expansion, is not pressed by the pressing attachment 43, but instead protrudes toward the back side of the mounting plate 6 and escapes, and is pressed forward by the operation of the reciprocating body 1. There is no. Therefore, when the arrangement of the tubes 50 to be expanded is changed, the pressing surface 4
Pressing attachment 43 with 4 different patterns
A desired mandrel 41 can be used for pipe expansion by simply replacing the mandrel 41, and there is no need to attach or detach the mandrel 41 mounted on the mounting plate 6.

Further, since the mandrel 41 is prevented from coming off by engaging the locking step portion 42 on the head with the mounting plate 6, the mandrel 41 is attached to the mounting plate 6 by attaching the mandrel 41 to the mounting plate 6. This can be achieved by simply inserting the mandrel 41 into each through hole 7 of the plate 6, and there is no need to separately provide a special mechanism for holding the mandrel 41.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In Figures 1 and 2, reference numeral 1 indicates a reciprocating actuator connected to a hydraulic cylinder 4 attached to the upper part of a frame 3 erected on a base 2 so as to be movable up and down along guide shafts 5. A through hole 11 is provided in the center of the body. Reference numeral 6 denotes a mounting plate provided on the lower surface of the reciprocating body 1, in which a plurality of through holes 7 having a stepped portion 7' with a larger diameter on the upper side coincide with the maximum arrangement state of the pipe 50 to be expanded. It is drilled in.

Reference numeral 41 denotes a tube expansion mandrel which is inserted into each of the through holes 7 of the mounting plate 6 so as to be slidable in the vertical direction.A ring-shaped member is fixed to the head of the mandrel, and the mandrel is formed to have a larger diameter than the mandrel shaft. A locking step 42 is provided, and the locking step 42 is connected to the through hole 7.
By engaging with the stepped portion 7', it is prevented from coming off toward the lower tip side. 9 is the reciprocating body 1
A plurality of tubular holding sleeves are inserted through the holes 11 of the mounting plate 6 and provided above each hole 7 of the mounting plate 6, and the head of the mandrel 41 can be inserted therein.

Reference numeral 8 denotes a mounting space formed as a space between the bottom surface of the reciprocating body 1 and the back side (top side) of the mounting plate 6, in which the pressing attachment 43 is detachably mounted. show. The pressing attachment 43 is, for example, formed in the shape of a flat plate as shown in FIG. 4, and has an engagement piece 55 in a substantially U-shaped plane on one side thereof. Pressure surface 4 is placed at the position corresponding to 2 rows and 10 steps.
4 is formed, and mandrels 4 are formed in other parts.
A plurality of holes 45 are drilled through which 1 can be inserted. Further, a large number of pressing attachments 43 with different patterns of pressing surfaces 44 are prepared.

In FIG. 2, reference numeral 10 denotes an insertion passage provided on the rear side (on the right side in the figure) of the hollow part 8 for mounting the pressing attachment, and is used for mounting and removing the pressing attachment 43 into the hollow part 8. It is a passage.

Reference numeral 26 denotes a vertical, multi-tiered, front-back open box-shaped rack for storing a plurality of pressing attachments 43 in a divided manner. Bracket parts 29, 29 are separately provided on the upper part of the frame 3 so as to face the passage 10 and can be selected, and are screwed onto a rotatable screw shaft 28 by an electric motor 27, so that the screw shaft 28 can be rotated. It is installed so that it can be raised and lowered by operation. A cylinder 30 is attached to the frame 3 behind the rack 26, and its cylinder rod 31 is capable of reciprocating and rotating. Reference numeral 32 denotes an engagement piece 34 having a flange 33 provided at the tip of the cylinder rod 31, and the engagement piece 34 engages the engagement piece 55 of the pressing attachment 43 by the rotation and reciprocating movement of the cylinder rod 31. This is a device that can be freely engaged and detached from the press attachment 43 and inserted into and taken out from between the rack 26 and the mounting cavity 8.

In FIG. 1, reference numeral 13 denotes a support plate which is attached to the guide shafts 5 in a plurality of upper and lower stages through suspension rods 12 suspended below the reciprocating body 1. The support plate 13 has a plurality of through holes 1 formed therein.
5 through which the shaft portion of the mandrel 41 is inserted to prevent the mandrel 41 from steadying. 1
Reference numeral 4 denotes an abutting table which is provided at the lower end of the suspension rod 12 to be located at the lowermost position of the support plate 13 and is slidably fitted into the guide shaft 5. A large square hole 16 is drilled through the mandrel 41 through which the mandrel 41 is inserted. Reference numeral 19 denotes an abutment receiving plate which comes into contact with the corresponding abutment table 14 when the abutment table 14 is lowered to prevent the lowering speed of the abutment table 14 from decreasing and from lowering beyond a certain position. It is supported by a rod 22 of an air balancer 21 attached to a bracket 20 screwed onto the upper part of a freely movable screw shaft 18, and at the lower part of the corresponding receiving plate 19 there is a tip end of a tube 50 to be expanded. A flare punch (which is conventionally known) is provided for performing flaring. Incidentally, the mandrel 41 is also inserted through the corresponding receiving plate 19 and the flare punch.

Reference numeral 53 denotes a stopper plate that is supported by brackets 24, 24 protruding from the lower surface of the abutment receiving plate 19 and is detachably provided.
This is to prevent the mandrel 41 from descending unnecessarily for tube expansion, and for example, as shown in FIG.
A plurality of holes 52 for inserting the mandrel 41 are bored at positions corresponding to the above-described pressing attachment 43, and a plurality of holes 52 with different patterns are prepared in the same way as the pressing attachment 43.

Reference numeral 17 denotes a stage for setting the tube 50 below the abutment receiving plate 19, and can be raised and lowered by rotation of a screw shaft 18 to adjust its position. 3
Reference numeral 5 denotes a pinion 3 that meshes with a rack 37 that is attached to the reciprocating body 1 by hanging down through a bracket 36.
8, which is used to measure the vertical dimension of the reciprocating body 1. 39
are the cylinders 4, 30 and the electric motors 27, 4.
An operation control panel for controlling 0, etc., displaying the encoder 35, etc. is shown.

49, as shown in FIG. 3, the upper and lower surfaces of the conductive plate 46 are coated with insulators 47, 47', and holes 48 are bored in the same arrangement as the holes 7 of the mounting plate 6, through which the mandrels 41 are inserted. It is attached to the upper position of the contact table 14.

The tube expansion device according to this embodiment has the above configuration, and an example of its use will be described next.

First, as shown in FIG. 2, in a state where a total of 60 mandrels 41 are hung in each hole 7 of the mounting plate 6 in, for example, 3 rows and 20 stages, the pipes 50 arranged in, for example, 2 rows and 10 stages are To carry out the pipe expansion work, as shown in FIG.
Attach it to part 8. This work is carried out by operating the electric motor 27 and rotating the screw shaft 28 to move the rack 26 up and down to bring a predetermined pressing attachment 43 in the rack 26 to face the insertion passage 10, and then moving the pressing attachment 43 This can be done by pushing the rod 31 of the cylinder 30 toward the insertion passage 10.

Next, when the hydraulic cylinder 4 is operated to lower the reciprocating body 1 after the above settings, the holes 45 drilled in the pressing attachment 43 among the plurality of mandrels 41 hooked to the mounting plate 6 are A total of 40 mandrels 41 located below are not pressed by the pressing attachment 43. The mandrel 41, which is not pressed by the attachment 43, descends slightly with the reciprocating body 1, but due to this descent, it comes into contact with the stopper plate 53 and is prevented from further descending. The upper part of the presser is inserted into the upper part of the holding sleeve 9 through the hole 45 of the pressing attachment 43 so as to project upward from the mounting plate 6.

On the other hand, the pressing surface 44 of the pressing attachment 43
A total of 20 mandrels 41 in two rows and 10 stages are pressed down by the pressing attachment 43, so that only the mandrels 41 necessary for expanding 20 of the 60 mandrels are pressed down and the mandrels 41 are pressed down. The tubes 50 are press-fitted into the tubes 50 set on the stand 17 and arranged in two rows and 10 stages. This allows proper pipe expansion work to be carried out.

In addition, if a weak current was sent to the conductive plate 46 of the detector 49 attached to the abutting stand 14 during the pipe expansion work, the mandrel 41 being pressed would not be press-fitted into the specified pipe 50, which would hinder the pipe expansion work. When the mandrel 4
1 is bent or misaligned and the hole 48 of the detector 49
contacting the conductive plate 46 on the inner circumferential surface 48' of both 4
By energizing between 6 and 41, an alarm etc. can be generated, and thereby the pipe expansion work can be automatically monitored.

Further, the end of the pipe expansion work can be confirmed by the detection value of the downward stroke of the reciprocating body 1 counted by the rotary encoder 35, and then the reciprocating body 1
The tube expansion work is completed by raising the tube 50, but when the tube 50 comes down, a considerably large tensile resistance force is generated on the mandrel 41 press-fitted into the tube 50. Stepped portion 4
2 to engage the mounting plate 6, the mandrel 4
The mandrel 41 can be reliably pulled out from the tube 50 without fear of the mandrel 41 coming off the mounting plate 6 toward its distal end.

Furthermore, when expanding the tube 50 in a different arrangement from the above, the pressing attachment 43 used in the previous tube expansion operation is attached to the cylinder 30.
is engaged by the engaging piece 33 of the rod 31, taken out from the mounting cavity 8, and housed in the rack 26, and another pressing attachment 43 formed with a pressing surface 44 of a different pattern is inserted into the rack. 26 and reinstall it into the mounting space 8. If the reciprocating body 1 is then lowered, the specified pipe expansion work can be performed by pressing only the mandrel 41 corresponding to the pressing surface 44 of the new pressing attachment 43, and there is no need to touch the mandrel 41 at all. be.

In the above embodiment, a stopper plate 53 is separately used to prevent the mandrel 41 from descending unnecessarily for pipe expansion. Even if it descends and comes into contact with a member around the tube 50, it does not firmly press the member, but still protrudes upward from the mounting plate 6, causing escape. Therefore, the stopper plate 53 is not necessary in the present invention. As a result, in the present invention, it is only necessary to change the pressing attachment 43 in order to change the setup for the pipe expansion work.

In addition, in the above embodiment, the mandrels 41 are arranged in three rows 20
Since the mandrels 41 are installed in stages, if the mounting pitch of the mandrel 41 and the arrangement pitch of the pipes are the same, all pipe expansion work for pipes 50 within 3 rows and 20 stages can be handled by simply replacing the pressing attachment 43. It becomes possible. However, the present invention is not limited to the specific arrangement and number of mandrels 41, which can be changed as appropriate depending on the conditions of the tube to be expanded. Therefore, the number of through holes 7 formed in the mounting plate 6 through which the mandrels are inserted can also be changed.

Moreover, the pressing attachment 43 according to the present invention
The specific structure is not limited to that of the above-mentioned embodiments; for example, as shown in FIG. 6, an integral hole 45' may be appropriately provided at a position where the pressing surface 44' is not formed. Note that the pressing attachment 43 does not need to be replaced by mechanical work using the cylinder 30 or the like as in the above embodiment, but may be replaced manually. Therefore, the engaging piece 55 for engaging with the rod 31 of the cylinder 30 is not an essential requirement.
Moreover, the pressing attachment 43 according to the present invention
In short, the pressing surface 44 for pressing the mandrel 41 may be formed in accordance with the position of the mandrel to be used.

Furthermore, the pipe expanding device according to the present invention is not limited to the so-called vertical pipe expanding operation in which the mandrel 41 is moved in the vertical direction as in the above embodiment, but is applicable to
Naturally, the present invention can also be applied to a so-called horizontal tube expansion device that moves the mandrel 41 in the horizontal direction, as described in Japanese Patent No. 9732 and the like.

Furthermore, the specific configuration of each part, such as the specific mounting and forming means of the mounting cavity 8 for mounting the pressing attachment 43, the mounting plate 6, the reciprocating body 1, etc. of the tube expansion device according to the present invention, is as follows. All designs can be changed as desired within the intended scope of the present invention.

(Effects of the Invention) As described above, the present invention is characterized in that a mandrel is slidably inserted through a mounting plate provided on a reciprocating body, and the locking step formed on the head of the mandrel and the mounting plate are connected. It is provided to prevent the distal end from coming off by engagement, so that only the mandrel corresponding to the pressing surface of the pressing attachment installed in the mounting cavity formed on the back side of the mounting plate can be appropriately pressed. Because of the similar configuration, if the arrangement or number of tubes to be expanded is changed, simply changing the pressing attachment allows pressing only the necessary mandrels that correspond to the tubes. Appropriate pipe expansion work was now possible.

As a result, the labor required to attach and detach a large number of mandrels from the reciprocating body each time the arrangement of the tubes is changed can be saved, and the workability has been significantly improved compared to the conventional method.

In addition, since the present invention simply attaches the mandrel with the locking step provided on the head of the mandrel locked to the mounting plate, the mounting structure is very simple and easy to manufacture. There is also the advantage that it is easier.

[Brief explanation of drawings]

1 and 2 show an embodiment of the tube expansion device according to the present invention, in which FIG. 1A is a front view, FIG. 1B is a side view, and FIG. figure. Third
The figure shows a detector, where A is a plan view and B is an enlarged sectional view taken along the line B-B of A in the figure. FIG. 4 is a plan view showing an example of a pressing attachment. FIG. 5 is a plan view showing an example of a stopper plate. FIG. 6 is a plan view showing another embodiment of the pressing attachment. FIG. 7 and FIG. 8 are explanatory diagrams showing a conventional example. 1...Reciprocating body, 6...Mounting plate, 7...Through hole, 8...Empty space for mounting, 41...Mandrel,
43... Pressing attachment, 44... Pressing surface.

Claims (1)

[Claims] 1. A pipe expanding device comprising a reciprocating body 1 for reciprocating the mandrels 41 facing the pipes 50 so as to be able to press-fit the mandrels 41 for pipe expansion into the pipes 50 to be expanded. The reciprocating body 1 is provided with a mounting plate 6 having a plurality of through holes 7, and each through hole 7 of the mounting plate 6 has a head portion having a diameter larger than that of the mandrel shaft. The mandrel 41 provided with a locking step 42 is slidable so as to protrude to the rear side of the mounting plate 6, and the engagement between the locking step 42 and the mounting plate 6 causes the mandrel 41 to be attached to the tip end side. The mounting plate 6 has a pressing surface 44 on the back side for pressing the head of the mandrel 41 corresponding to the position of the mandrel 41 used for pipe expansion. A tube expansion device characterized in that a mounting cavity 8 is provided for removably mounting a pressing attachment 43 formed of a pipe.