JPS63183733A - Tube expanding machine - Google Patents

Abstract

PURPOSE:To shorten the set-up change time so that a mandrel set up change can be completed surely within a replacing time of an object to be worked, by executing the set-up change of a mandrel by switching a stop position of pattern pieces provided by dividing into plural pieces in the mandrel stage direction. CONSTITUTION:At the time of executing a tube expanding of an object to be worked, to which a heat exchanger tube has been arrayed in two rows and nine stages by using that which has set a mandrel 10 in two rows and 13 stages, an air cylinder 106 is driven against each two pieces of the inside among four pieces of patterns pieces 103 of both sides, and its pattern pieces 103 are allowed to descend and stopped at a first position. Each two pieces of pattern pieces 103 of the outside maintain a second stop position by a spring 105. In this state, when a moving frame 8 is advanced, each four pieces of mandrels 10 of both sides do not advance since the corresponding pattern pieces 103 are at the second stop position, and the mandrels 10 of No.5-8 and No.19-22 against which the pattern pieces 103 are at the first position, and the mandrels of No.9-18 between them advance.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to pipe expansion i in which a mandrel is inserted into each of a plurality of pipes at the same time. Concerning a pipe expander that can quickly respond to changes.

Such a tube expander is used, for example, to manufacture a cross-fin coil, which is a type of heat exchanger, to streamline operations and reduce manufacturing costs.

Below, we will discuss the tube expander for producing cross-fin coils.

[Conventional technology]

As shown in FIG. 9, the cross fin coil has a large number of heat exchanger tubes T in the longitudinal direction y and one to three heat transfer tubes T in the middle direction 2 for a large number of fins F, F....

The structure is such that T... is inserted through a skewer, and the number of heat exchanger tubes in the y direction is usually expressed in stages, and the number of heat exchanger tubes in two directions is usually expressed in rows.

Conventionally, such a loss fin coil has been manufactured by simultaneously inserting mandrels 10, 10... into the heat transfer tubes T, T... and expanding the heat transfer tubes T, T... at the same time. ,
It is manufactured by fixing it to F...

There are two types of pipe expanders used for this type of pipe expansion: vertical and horizontal.
Although there are different types, the basic configuration is the same for all tube expanders.

The basic configuration will be explained with reference to FIGS. 7 and 8. A mandrel support frame 5 is provided at the front in the mandrel insertion direction on the base l, and a fixing frame 2 is provided at the rear. A pair of left and right guide bars 4.4 is installed between the mandrel support frame 5 and the fixed frame 2, and a movable frame 8 is slidably attached thereto.

A large number of mandrels 10 are arranged in parallel between guide bars 4 and 4 according to the number of stages and rows of cross-fin coil heat transfer tubes, and the base end is supported by a moving frame 8, with the middle part penetrating the mandrel support frame 5 and expanding at the tip. A head 18 (FIG. 9) is provided. A workpiece fixing means 19 is provided in front of the mandrel 10, and a cross-fin coil 21, which is a workpiece to be processed, is supported on this in a posture with a heat exchanger tube positioned on an extension of the mandrel 10. Then, by moving the movable frame 8 forward with the tube expansion cylinder 9 fixedly installed on the fixed frame 2, the mandrel 10
are inserted into the heat transfer tube all at once and the tube is expanded.
indicates the mandrel axis direction, Y indicates the mandrel stage direction, and 2 indicates the mandrel column direction.

By the way, in such a pipe expanding machine, it is customary for one shop to process a plurality of types of cross fin coils 21 having different numbers of stages. The mandrel 10 has a number of stages that can accommodate the largest of multiple models, and when processing a smaller cross fin coil 21, remove unnecessary mandrels 10 and reinstall them when necessary. Therefore, the number of stages of the mandrel 10 is changed.

However, this work of changing the mandrel 10 is time-consuming and is a major factor in reducing work efficiency.

For this reason, a pattern plate is inserted into the proximal support part of the mandrel 10, and unnecessary mandrels 10 are allowed to escape backward through the escape hole provided in the pattern plate during tube expansion, and only the necessary mandrels 10 are supported by the pattern plate, and the moving frame is A pipe expander that moved forward with 8 was developed in JP-A-6
No. 0-3927.

[Problem that the invention seeks to solve]

With this tube expansion machine, if you prepare a pattern plate that matches the model (number of stages) of the cross fin coil, it is certainly possible to change the model by replacing it, but in reality the pattern plate is large. It is heavy and takes time to replace, making it difficult to complete the plate replacement within the coil replacement time, and the work time is forced to be extended by changing the mandrel stage.

Furthermore, since it is necessary to have pattern plates suitable for each processing mechanism, the replacement mechanism becomes large-scale, and when there are many types of processing machines, it becomes difficult to maintain pattern plates.

In particular, recently the models of cross fin coils have become more diversified.
The number of processing models required for a single tube expansion machine has increased significantly, and the pattern plate type tube expansion machine described above can cope with this trend of diversification in terms of work efficiency and mechanism. is a difficult situation.

The present invention was developed in view of this situation, and it is possible to reliably complete the mandrel changeover within the time required to replace the workpieces, and to increase the size of the changeover mechanism even when the number of machines to be machined increases. This provides an unnecessary pipe expander.

[Means for Solving the Problems] The mandrel change mechanism, which is a main part of the pipe expander of the present invention, will be explained with reference to FIGS. 1 to 3 of the embodiment drawings.

Fig. 1 is a cross-sectional view taken along line A-A in Fig. 7 and is a front view, Fig. 2 is a cross-sectional view taken along line B-B in Fig. 1 and is a plan view, and Fig. 3 is a plan view of Fig. 1. It is a side view and a cross-sectional view taken along the line C-C, and both drawings show a state in which the moving frame 8 is located at the backward limit.

According to FIGS. 1 to 3, the movable frame 8 is provided with a plurality of pattern pieces 103° 103 divided in the mandrel step direction Y as a proximal end support portion of the mandrel 10,
The mandrel 10 corresponding to the pattern piece 103 is provided movably in the axial direction X with respect to the moving frame 8. Mandrel 10 without pattern piece 103
The base end thereof is fixed to the moving frame 8.

Each pattern piece 103 is movable in a direction perpendicular to the mandrel step direction Y, has two stopping positions in the direction of movement, and is provided with an independent drive mechanism 106 for movement. The pattern piece 103 also has a clearance hole 108 for passing the corresponding mandrel therethrough, as shown in detail in FIG. The corresponding mandrel 10 is supported and allowed to pass backward through the relief hole 108 at the second stop position (figure opening).

[For production]

In such a mandrel change mechanism, if all the pattern pieces 103 are fixed at the first stop position and the moving frame 8 is advanced, the pattern pieces 103 will Since the proximal ends of the mandrels 10 are supported by 103, all the mandrels 10 move forward together with the moving frame 8.

On the other hand, if the movable frame 8 is moved forward with all or part of the pattern piece 103 fixed at the second stop position, the pattern piece 103 fixed at the second upper stop position
At point 3, the mandrel 10 exits backward from the relief hole 108, and only the pattern piece 103 moves forward, and the mandrel 10 does not move forward. That is, by switching the stop position of the pattern piece 103, the mandrel IO selectively moves forward in the step direction, and the mandrel 10
A stage change is executed.

As mentioned above, this mandrel level change is easily performed by switching the stop position of the pattern piece 103, and not only does it not require the effort of replacing the pattern plate, but also allows the pattern piece to 103 may be subdivided, and the overall scale of the device remains essentially the same.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. The illustrated pipe expanding machine is a horizontal type pipe expanding machine for producing cross-fin coils.

First, the overall structure of the tube expander will be explained with reference to a plan view in FIG. 7 and a side view in FIG. There is one guide bar on each left and right between the fixed pillars 3, 3.
4 are spread horizontally.

The mandrel support frame 5 is supported by a guide bar 4.4 so as to be movable in the front and back direction in order to flare the pipe end after the pipe is expanded, and horizontal screws 6.6, one each on the left and right, are attached to the mandrel support frame 5. The block 7 is rotated by a built-in motor (not shown) to move the block 7, which is screwed into the horizontal screw 6, back and forth.

Between the mandrel support frame 5 and the fixed frame 2, a movable frame 8 is supported by guide bars 4, 4 so as to be movable in the front and rear direction, and the rod tip of a tube expansion cylinder 9 fixed to the rear surface of the fixed frame 2 is attached to the movable frame 8. It is pivotally mounted to drive the movable frame 8 back and forth. The horizontal screen 6 passes through the movable frame 8, and its tip is pivotally supported by the fixed frame 2 so as to be movable in the front and rear directions.

The rear ends of the mandrels 10, 10, . do.

Between the mandrel support frame 5 and the moving frame 8, several intermediate plates 12 are movably supported by the guide rod 4.4 in the front and rear direction. The plates 12, 12... and the intermediate plate 12 and the movable frame 8 are connected by connecting culms 13 so as to be expandable and contractable.

In front of the mandrel support frame 5, a front frame 14 is supported by guide rods 4, 4 so as to be movable in the front and rear directions. This front frame 14 is mainly used for flaring, and is equipped with a stripper 15 on the front and a number of flare punches corresponding to the number of mandrels 10, and the entire frame is moved forward and backward by a cylinder 17 fixed to the base l. It has become. In addition,
The flare punch is connected and interlocked with the mandrel support frame 5.

The number of stages and rows of the mandrels 10, 10... are set according to the largest scale among the cross fin coils to be processed, and each mandrel 10 has an intermediate plate 12 and a mandrel support. It passes through the frame 5, the front frame 14, and the flare punch provided on the front frame 14, and is provided with a tube expansion head 18 (FIG. 9) at its tip.

A workpiece fixing means 19 is provided in front of the mandrels io, to... on the base 1, and the cross fin coil 21 before tube expansion is mounted on the installation stand 20 so that the heat transfer tube is an extension of the mandrel 10, to... Clamp from above and both sides so that it is located on the line. 22 is cross fin coil 2
1 cradle, and is configured to move forward and backward using a screw 23.

The above is the overall structure of the tube expander.

Next, the mandrel change mechanism 11 will be explained in detail with reference to FIGS. 1 to 3.

In this illustrated example, as shown in FIG. 1, 26 mandrels to, to, . . . are arranged in two rows and 13 stages in a staggered manner. The number of each mandrel is indicated in FIG. 2, and the following explanation will be based on this number.

According to FIGS. 1 to 3, there is an eaves plate 100 in front of the fixed frame 2.
is attached by a stay 101. On the other hand, a face plate 102 is attached to the front surface of the moving frame 8, and pattern pieces 103 are arranged in the mandrel stage direction Y between the moving frame 8 and the face plate 102. Specifically, in this example, one stage (two mandrels) is used for each of the four stages of mandrels 10 on both the left and right sides, that is, IIkL1 to 8 and m19 to 26.
One pattern piece 103 is provided in each area.

Regarding the mandrel 10 provided with the pattern piece 103, the mandrel 10 passes through the face plate 102 movably in the axial direction, and is prevented from coming off forward by a stopper 104 at the base end.

On the other hand, the central mandrel 10 where the pattern piece 103 is not provided, that is, the mandrel 1 at positions 9 to 18
As for No. 0, the base end is fixed to the face plate 102.

The reason why the central mandrel 10 is fixed is that the smallest cross-fin coil to be processed can be processed with this fixed mandrel 10, and there is no need to change the stage in the central part.

As shown in FIG. 3, each pattern piece 103 is located between the moving frame 8 and the face plate 102 and is provided to move independently in the mandrel row direction Z, and is provided with a push-up spring 105 at the lower end. An air cylinder 106 provided on the eaves plate 100 of the fixed frame 2 is located above as a drive mechanism, and the air cylinder 106 is located above as a drive mechanism. The pattern piece 103 is forcibly pushed downward against the spring 105. The position where the pattern piece 103 is pushed down is the first stop position, and the position where the pattern piece 103 is pushed upward is the second stop position.

FIG. 3 shows the state of the pattern piece 103 in the depressed first stop position, and FIG. 4 shows the state of the pattern piece 103 in the pushed up second stop position.

In addition, 101 is a proximity switch attached to the eaves plate 10O of the fixed frame 2, which detects the approach and separation of the magnetic piece 103' attached to the upper end of the pattern piece 103, and identifies the stop position of the pattern piece 103. It is something.

The individual pattern pieces 103 are also shown in FIGS.
The depressed first stop position (
In Fig. A), two relief holes 108, 108 intersect with the mandrel axis at the second stop position (opening) which forms the contact surface of the proximal end of the mandrel 10.10 and is pushed up. Mandrel 10.10 should be moved backwards. Further, two upper and lower pin holes 109 and 109 are provided at intervals equal to the movement stroke of the pattern piece 103, into which lock bins to be described later are fitted.

As shown in FIGS. 2 and 3, a pair of left and right horizontal rods 1 are provided at the center of the moving frame 8 and the face plate 102.
10 extends through the knock plate movably in the front and rear direction, and its rear end is connected by a knock plate 111.

The knock plate 111 has a spring 112 between it and the movable frame 8, and a cylinder 113 fixed to the fixed frame 2.
The two horizontal rods 110 and 110 are connected to the spring 112.
It is configured to push forward against the 114
is the horizontal rod 110 to guide the horizontal rod 110.
This is a bushochet interposed between the front plate 102 and the face plate 102.

A lock plate 115 located in front of the face plate 102 and having a length approximately equal to that of the front plate 102 is coupled to the tip of the horizontal rod 110.110. This lock plate 11
5 has a lock pin 116 corresponding to the pattern piece 103 on the rear surface, and in a normal state, the spring 112 presses the lock pin 116 against the face plate 102 to fit the lock pin 116 into the pin hole 109 (FIG. 5) of the pattern piece 103. , the lock plate 115 is moved to the face plate 1 by the driving of the cylinder 113.
02 and the lock bin 116 enters the pin hole 109 (fifth
The structure is such that the pattern piece 103 is allowed to move in the vertical direction by coming out of the pattern piece 103 (FIG.).

As shown in FIG. 3, an alignment cylinder 117 is also attached to the fixed frame 2, and two alignment rods 119, 119 are attached to the tips of the cylinders via springs 11B and 118 as buffer bodies. Mandrel 10.10 is attached coaxially to the rear. This is a mechanism that moves the alignment rods 119, 119 forward when the moving frame 8 is at the backward limit to eliminate misalignment of the rear ends of the mandrels io and to.
They are provided corresponding to each of the pattern pieces 103. In addition, in FIG. 1 and FIG. 2, this a structure is omitted for convenience of illustration.

The operation of the tube expander configured as described above will be explained next.

First, the mandrel stage changing operation will be explained with reference to FIGS. 1 to 5. As mentioned above, the mandrel 10.10 is
The number of rows and stages are set according to the largest cross fin coil to be processed. In this example, there are two rows,
It is set in 13 stages.

Now, let us explain the case where this tube expander processes a cross-fin coil in which heat transfer tubes are arranged in two rows and nine stages.
First, with the movable frame 8 at the backward limit, the lock opening/closing cylinder 113 is operated to extend the opening and closing position.

This moves the two horizontal rods 110.110 forward,
The lock plate 115 is moved away from the front of the face plate 102,
The lock bin 116 comes out of the pin hole 109, and all pattern pieces 103 are allowed to move up and down.

Next, among the four pattern pieces 103 on each side, an air cylinder 1 as a drive mechanism is applied to each two on the inside.
Drive 06.

By driving the air cylinder 106, pattern piece 1
03 is lowered against the spring 105 and located at the first stop position. The two pattern pieces 103 on each side of the air cylinder 105 that are not driven are maintained at the second stop position by the spring 105.

Next, from this state, the lock opening/closing cylinder 113
re-drive and retract the rod.

As a result, the lock play) 115 is retracted by the spring 112 and returned to its original position, so that each of the two inner pattern pieces 10 at the first stop F position (lowered position)
3, the lock pin 116 fits into the upper pin hole 109, and for the two pattern pieces 103 on each side at the second stop position (raised position), the lock pin 116 fits into the lower pin hole 109.
to identify each pattern piece 103 at its respective stop F position.

Once the pattern piece 103 is fixed, the air cylinder 113 is reactivated to retract the rod to its original position.

FIG. 1 shows this state.

This completes the stage change of mandrel 10.10...
Continue to expand the tube.

The tube expansion operation will be explained with reference to FIGS. 7 and 8.
First, a cross-fin coil in which heat exchanger tubes are arranged in two rows and nine stages is fixed by the workpiece fixing means 19 in a symmetrical position with the heat exchanger tubes positioned on the mandrel axis. Further, the movable frame 8 is set to the backward limit, and the front frame 14 is moved forward by the operation of the cylinder 17 to bring the stripper 15 into temporary contact with the tube of the coil.

Next, from this state, the tube expansion cylinder 9 is driven to extend the rod.

As a result, the moving frame 8 moves forward, but for the four mandrels 10 on each side, that is, the mandrels 10 on floors 1 to 4 and 1lh23 to 26, the corresponding pattern pieces 1
Since pattern piece 03 is at the second stop position, pattern piece 1
The pattern piece 103 moves backward through the relief holes 108, 108 of 03, and only the pattern piece 103 moves forward, and the mandrel 10 does not move forward.

The mandrel 10 is advanced on the mandrels on floors 5-8 and N119-22 where the pattern piece 103 is fixed at the first stop position, and on the 11 m 9-22 mandrels where the pattern piece 103 is fixed at the first stop position.
There are 18 mandrels.

Regarding the mandrels 10 at intervals 5 to 8 and 1lh19 to 22, since the pattern piece 103 is fixed at the first stop position, the pattern piece 103 pushes the base end of the mandrel 10 forward, causing the moving frame 8 to move forward. and advance forward. - Regarding mandrel 10 of 9 to 18,
Since the rear end is fixed to the face plate 102, the movable frame 8
move forward with

As described above, only the mandrels 10 corresponding to the central nine stages move forward and are inserted into the heat exchanger tubes of the cross fin coil to expand the heat exchanger tubes.

When the pipe expansion is completed, the moving frame 8 collides with the block 7.7, advances the horizontal screw 6.6, and slightly moves the mandrel support frame 5 forward.

As a result, a flare punch connected to the Andrel support frame 5 is inserted into the tube end of the heat exchanger tube that has finished expanding, and flaring is performed.

When the flaring process is completed, the tube expansion cylinder 9 retracts the rod and moves the moving frame 8 backward. As a result, the mandrel 10 that has moved forward moves backward and returns to its original position.

During this retreat, the mandrel 10, which has not moved forward, is pulled backward due to friction with the pattern piece 103 or the intermediate plate 12, and the rear end may protrude rearward from the pattern piece 103 when the retreat is completed. When the rear end of the mandrel 10 touches the pattern piece 103, the pattern piece 103 does not move, so for the mandrel 10 that has not moved forward, the alignment cylinder 117 is driven prior to the next step change, and the alignment rod 119° is moved. 119
The mandrel 10 is pushed forward by moving the mandrel forward.

When the mandrel 10 retreats to its original position, the mandrel support frame 5 and front frame 14 return to their original positions, and the cross fin coil 21 is removed from the workpiece fixing means 19, completing the series of operations.

In this embodiment, the mandrels 10 are arranged in two rows and 13 stages, but of course the arrangement is not limited to this arrangement.

In addition, although the pattern pieces 103 are arranged at both ends of the mandrel in the direction Y, they may be arranged throughout the mandrel in the direction Y, and one pattern piece 103 may be provided in each step.
In addition to providing three pattern pieces 103, it is also possible to provide one pattern piece 103 for every two or three or more stages of mandrels 10.

Furthermore, in this embodiment, only the stage change of the mandrel 10 is performed, but the present invention can perform the row change as well as the stage change.

FIGS. 6(A) to 6(C) illustrate the shape and operation of the pattern piece 103, which can be changed in both stages and rows.

If the shape and arrangement of the relief holes 108 in the pattern piece 103 are made as shown in the figure, the first
In the stop position shown in FIG. The mandrels 10 are advanced, and at the third stop position shown in FIG.

Moreover, in FIG. 6, if the escape holes 10B are limited to the lower two and the first stop position shown in FIG. 6A and the third stop position shown in FIG. It is also possible to just change the columns.

〔Effect of the invention〕

As is clear from the above description, the tube expander of the present invention changes the mandrel stage by switching the stop positions of the pattern pieces that are divided into multiple parts in the direction of the mandrel stage, and the pattern pieces are changed at each stage. Since the pieces can be simultaneously changed using a dedicated drive mechanism, the changeover time is short and the changeover can be completed within the time it takes to change the workpieces. Therefore, there is no need to extend the working time due to stage changes, and work efficiency is greatly improved.

Furthermore, even if the number of machines to be processed increases, this can be handled by dividing the pattern pieces into smaller pieces, and there is no need to increase the overall scale of the stage change mechanism, so that it can sufficiently cope with the diversification of machines.

[Brief explanation of the drawing]

Figures 1 to 8 show a tube expander embodying the present invention. Figures 1 to 4 are cross-sectional views showing the mandrel change mechanism, Figures 5 and 6 are front views showing the pattern piece, and Figures 7 and 8 are tube expansion tubes. FIG. 2 is a front view and an end view showing the overall structure of the machine. Moreover, FIG. 9 is a perspective view showing the cross fin coil. In the figure, 8: moving frame, 10: mandrel, 11: mandrel level change mechanism, 103: pattern piece, 106: drive mechanism, 108: relief hole, X: mandrel axial direction, Y: mandrel level direction, Z: mandrel row direction. 9th R Figure 6

Claims (1)

[Claims] (1) Mandrels (10), (10) arranged in parallel in multiple stages
)... with its base end supported by the moving frame (8), and the moving frame (8)
) is a tube expander that expands tubes by inserting them into multiple tubes at once by moving forward, and the pattern is divided into multiple sections in the step direction (Y) of the mandrel (10) as a mandrel proximal end support member in the movable frame (8). Peace (103), (103)...
・Equipped with pattern pieces (103), (103)...
A corresponding mandrel (10) is provided movably in the axial direction (X) with respect to the moving frame (8), while each pattern piece (103) is movable in the axial direction (X) of the mandrel (10).
movable in the direction perpendicular to the direction of movement, has at least two stopping positions in the direction of movement, and has an independent drive mechanism for movement (
106) and forms a contact surface for the base end of the mandrel at the first stop position, and through which all or part of the mandrel (10) corresponding to the pattern piece (103) is inserted at the second and subsequent stop positions. (108
).