JP4408873B2 - Liquid pressure expansion molding equipment - Google Patents

Description

  The present invention relates to a liquid pressure expanding and forming apparatus, and more particularly, to a liquid pressure expanding and forming apparatus in which a tube expanding tool portion is reduced in size and weight to improve workability.

  Currently, a roller expansion method, a hydraulic expansion method, a seal welding method, an explosion expansion method, and the like are used as a method for joining tubes such as heat exchangers and condensers to a tube plate. Among them, the hydraulic expansion method that directly expands using a hydraulic pressure of several thousand atmospheres is used in many fields because it can work in a clean environment with accurate and strong expansion using the energy of hydraulic pressure. . In the roller tube expansion method, peeling (flaking) may occur on the inner diameter of the tube due to rolling pressure, but in the liquid pressure tube expansion method, uniform pressure is applied to the inner surface of the tube to expand the tube, so the contact pressure is managed accurately. It is possible to expand the pipe with high reliability.

Conventionally, as a hydraulic pressure expansion device, for example, a type in which a booster is built in a tube expansion tool portion that is held in the hand of an operator as described in Patent Document 1 is generally used.
Moreover, although the pressure management of super high pressure water is generally converted by the primary hydraulic pressure on the low pressure side of the booster (see FIG. 2 of Patent Document 1), there is also known one in which a pressure sensor is provided in the tube expansion tool portion. (FIG. 1 of Patent Document 1).
Utility Model Registration No. 2602658

However, the type in which the booster is integrated with the tube expansion tool portion is structurally heavy, so that the burden on the operator increases during continuous work. In addition, there is a problem in that workability is poor because accurate alignment is difficult to perform due to inertial force due to weight increase.
In the hydraulic expansion device described in Patent Document 1, since the booster is returned by supplying water from the plunger side or by supplying hydraulic pressure to the low-pressure cylinder, a return pipe for that purpose is required. For this reason, the structure of the booster is complicated, and there is a problem that the assembly workability and the maintainability are poor.
Moreover, if the pressure management of the ultra high pressure water is converted to the primary hydraulic pressure on the low pressure side of the booster, it is difficult to control the pressure of the ultra high pressure water accurately and in a timely manner. Furthermore, there is a problem of conversion accuracy between the primary hydraulic pressure of the booster and the ultrahigh pressure water discharged by the booster, and the primary hydraulic pressure rises at the stroke end, but conversely, the water pressure becomes zero.
On the other hand, when the pressure sensor is provided in the tube expansion tool portion, there are problems that the operability is deteriorated due to an increase in weight and the system is complicated such as addition of a control cable.

  Accordingly, an object of the present invention is to provide a hydraulic tube expansion molding apparatus in which the tube expansion tool portion is reduced in size and weight and workability is improved in order to solve the above-described problems.

In order to solve the above-mentioned problem, the invention according to claim 1 is equipped with a tube expanding tool portion that is equipped with a seal portion that performs tube expansion molding by the liquid pressure of the ultra high pressure liquid, and injects the ultra high pressure liquid into the seal portion, A main body for supplying the ultra-high pressure liquid to the tube expansion tool portion, and the main body portion and the tube expansion tool portion are configured as separate bodies, and an operator can hold the tube expansion tool portion in his hand for tube expansion work. A hydraulic pressure expansion molding apparatus, wherein a booster that hydraulically expands the expansion liquid to be expanded into the main body is discharged from a discharge hole, and a liquid supply unit that supplies the expansion liquid to the booster. A hydraulic unit that supplies the booster with pressure oil that generates the hydraulic pressure, and the hydraulic pressure of the ultra-high pressure liquid is a hydraulic pressure of ultra-high pressure water, and the tube expansion tool portion includes the seal portion. An ultra-high-pressure channel that communicates with the ultra-high Flow path and the discharge hole of the booster is connected by ultra-high pressure tube is provided with a pressure transducer for detecting the pressure of the ultrahigh pressure fluid discharged from the discharge hole of said booster to said body portion, said booster cylinder A liquid supply chamber filled with the expanded liquid formed therein, a hydraulic chamber filled with the pressure oil, and the liquid supply chamber and the hydraulic chamber are reciprocated between the liquid supply chamber and the hydraulic chamber. A piston, and an urging means for urging the piston toward the hydraulic chamber, wherein the piston has a large-diameter portion that is in sliding contact with the cylinder, a small-diameter portion that forms a gap in the cylinder, and a center An introduction hole into which the pressure oil flows in along the axial direction, and the hydraulic chamber is formed in a gap between the cylinder and the small diameter portion, and is formed radially in the small diameter portion, A through hole communicating with the hydraulic chamber from the introduction hole And wherein the digit.
The “ultra-high pressure” means a pressure necessary for tube expansion molding, and generally means a pressure of several thousand atmospheres, although it depends on the size and shape of the tube.

As described above, the present invention separates the booster from the tube expansion tool portion and stores the booster in the main body portion, thereby reducing the size and weight of the tube expansion tool portion that the operator holds in his hand and improving workability. It is improving. For this reason, while reducing the burden of the operator at the time of a continuous operation | work, the position alignment at the time of inserting a seal | sticker part in a pipe | tube is made easy. In addition, the booster, which is a high-pressure source, is separated from the operator's hand and stored in the main body, thereby further improving safety.
In addition, the present invention does not detect the hydraulic pressure supplied to the booster, but directly detects the pressure of the ultrahigh pressure liquid discharged from the discharge hole of the booster by the pressure converter, thereby accurately adjusting the pressure of the tube expansion molding. Can be detected well. For this reason, highly accurate pressure management is possible and tube expansion quality can be improved.
Furthermore, by providing an urging means for urging the piston toward the hydraulic chamber, the piston can be returned by the urging means after the expansion of the pipe. This eliminates the need for a pressure increasing device such as a liquid supply side pipe for returning the piston and a high-pressure type plunger pump, thereby simplifying the main body as a whole. Further, since the supply pressure on the liquid supply side can be reduced, an inexpensive low-pressure pump can be used.

The invention according to claim 2 is the hydraulic pressure expansion molding apparatus according to claim 1, wherein a pressure reducing valve connected to the ultrahigh pressure flow path for discharging the ultrahigh pressure liquid from the drain and reducing the hydraulic pressure is provided. It is provided in the said tube expansion tool part, It is characterized by the above-mentioned.
According to such a configuration, the pressure reducing valve is provided in the ultrahigh pressure flow path, and this pressure reducing valve is circulated while circulating the pipe expanding liquid from the booster to the pipe expanding tool and the pressure reducing valve by the liquid supply pump provided in the liquid supply unit. Then, the expanded liquid can be discharged from the flow path of the expanded liquid.
For this reason, air can be easily vented without removing the piping, workability is improved, and the burden on the operator can be reduced. Further, by performing air bleeding together with flushing, high-precision pressure control becomes possible. And by increasing the compression efficiency of the expanded liquid, a synergistic effect of shortening the working time and extending the life of the seals can be expected.

According to a third aspect of the present invention, there is provided the hydraulic pressure expansion molding apparatus according to the second aspect, wherein the pressure reducing valve is controlled by pressure oil supplied from the hydraulic unit.
According to this configuration, by controlling the pressure reducing valve with hydraulic pressure, it is possible to control so that the pressure is automatically reduced after the pipe expansion, or it is possible to automatically bleed air with a button operation, thereby shortening the work time. In addition, workability can be improved.

The invention according to claim 4 is the fluid pressure expansion molding apparatus according to any one of claims 1 to 3 , wherein the booster communicates with the liquid supply chamber and introduces the pipe expansion liquid. A liquid supply side check valve for controlling the introduction of the expanded liquid into the liquid supply hole, and the liquid supply side check valve is adapted to the liquid supply hole; A spring that biases the liquid supply hole, and a valve cap that houses the valve and the spring and holds the spring against the liquid supply hole are provided.
In addition, the invention according to claim 5 is the fluid pressure tube forming apparatus according to any one of claims 1 to 3 , wherein the booster includes a discharge pipe that communicates with the liquid supply chamber from the discharge hole. A discharge side check valve for controlling discharge is provided. The discharge side check valve accommodates the valve adapted to the liquid supply hole, a spring for urging the valve to the liquid supply hole, the valve and the spring. And a valve cap that holds the liquid supply hole.
According to the invention which concerns on Claim 4 or Claim 5 , while providing the valve cap which accommodates and hold | maintains a valve | bulb and a spring, and the seal was made into integral structure, while reducing a number of parts and making it compact, maintenance property is also provided. Can also be improved.

  According to the hydraulic expansion apparatus according to the present invention, it is possible to provide a hydraulic expansion apparatus that reduces the size and weight of the expansion tool portion and improves workability.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In the drawings to be referred to, FIG. 1 is a perspective view for explaining an overall configuration of a hydraulic tube forming apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view showing a configuration of a seal portion, and FIG. 1 is a circuit diagram of a hydraulic expansion tube forming apparatus according to an embodiment of the present invention.

  As shown in FIG. 1, the hydraulic expansion pipe forming apparatus 1 according to the embodiment of the present invention is equipped with a seal portion 9 that performs pipe expansion molding with the hydraulic pressure of an ultrahigh pressure liquid, and the ultrahigh pressure liquid is supplied to the seal portion 9. A tube expansion tool portion 2 to be injected and a main body portion 3 that supplies the tube expansion tool portion 2 with an ultrahigh pressure liquid through an ultrahigh pressure tube 11 are configured. Further, the tube expansion tool portion 2 and the main body portion 3 are connected by a control hydraulic tube 12 and a pressure reducing drainage tube 13.

The seal portion 9 is mounted as an attachment on the hydraulic expansion tube forming apparatus 1. The seal portion 9 is a tool that is inserted into a pipe to be expanded and seals an ultra-high pressure liquid to control the expansion range. Various sealing methods are used in accordance with tube expansion conditions such as tube material, dimensions, and tube expansion pressure.
For example, as shown in FIG. 2, the tube-type seal portion 9 (mandrel) seals the discharge portion 91b of the ultrahigh pressure liquid supply passage 91a of the mandrel body 91 with a tube 92 to prevent leakage of ultrahigh pressure water. It is. The backup ring 93 and the expansion ring 94 having special shapes at both ends are configured to stably follow the fluid pressure in the tube 92 and expand. Therefore, even when the pressure reaches several thousand atmospheres, the plastic flow of the tube 92 can be completely sealed from the gap generated between the inner surface of the tube and the outer diameter of the mandrel.

An overall configuration of the hydraulic expansion device 1 according to the embodiment of the present invention, and a hydraulic circuit that constitutes a supply circuit and a control system for supplying the expanded solution will be described with reference to FIG.
The main body 3 stores a booster 4 for supplying the high-pressure liquid to the tube expansion tool section 2, a liquid supply unit 5 for supplying the liquid expansion to the booster 4, and a hydraulic unit 6 for supplying pressure oil to the booster 4. Has been.
On the other hand, the tube expansion tool portion 2 includes a pressure reducing valve 26 for reducing the pressure of the ultrahigh pressure liquid to be expanded and an ultrahigh pressure channel 23 communicating with the seal portion 9.

The liquid supply circuit has an extremely high pressure from the liquid supply tank 51 to the liquid supply chamber 41 of the booster 4 for supplying water as a pipe expansion liquid, and from the liquid supply chamber 41 of the booster 4 to the pipe expansion tool part 2 and the seal part 9. A flow path L2 for supplying water and a flow path R on the return side for discharging ultrahigh pressure water from the pressure reducing valve 26 to the liquid supply tank 51 are provided.
The flow path L <b> 1 is mainly composed of the liquid supply unit 5, and supplies water from the liquid supply tank 51 to the liquid supply chamber 41 of the booster 4 by the liquid supply pump 52. And the pressure converter 53 and the pressure gauge 54 which detect the pressure in a flow path are provided in the flow path L1.
A pressure transducer 56 that is a pressure detector for detecting the pressure of the ultrahigh pressure liquid discharged from the booster 4 is provided in the main body 3 in the flow path L2. In addition, the flow path L2 is connected to the tube expansion tool part 2 by the flexible super high pressure tube 11 (refer FIG. 1) from the main-body part 3 to the exterior side.
The flow path R is configured such that the ultrahigh pressure water is drained and returned to the liquid supply tank 51 by opening the pressure reducing valve 26 of the tube expansion tool portion 2. The flow path R is connected to the outside from the main body 3 by a flexible drain tube 13 (see FIG. 1).

  In this way, the liquid supply circuit is connected by connecting the flow path L1 through the flow path L2 to the super high pressure flow path 23 and the pressure reducing valve 26, and circulating from the pressure reducing valve 26 through the flow path R to the liquid supply tank 51. The air can be vented.

The hydraulic circuit passes from the storage tank 61 through the switching valve 63 (flow path L3) and is connected to the hydraulic chamber 42 of the booster 4 and from the storage tank 61 through the switching valve 64 (flow path L3) to reduce the pressure. And a flow path L5 connected to the valve 26.
The flow path L3 is mainly composed of the hydraulic unit 6, and the hydraulic pump 62 supplies pressure oil from the storage tank 61 to the switching valve 63 and the switching valve 64 that switch between the forward side and the return side.
And the flow path L3 and the flow path L4 are connected via the switching valve 63, and the pressure of the hydraulic chamber 42 of the booster 4 is controlled by switching the switching valve 63 in the flow path L4.
Further, the flow path L3 and the flow path L5 are connected via the switching valve 64. In the flow path L5, the switching valve 64 is switched to adjust the pressure in the flow path to control the opening / closing of the pressure reducing valve 26. ing.
The flow path L5 is provided with a flow rate adjustment valve 65 that regulates the flow rate on the return side.

Next, the configuration of the booster 4 will be described with reference to FIGS.
FIG. 4 is a cross-sectional view for explaining the configuration of the booster of the liquid pressure tube forming apparatus according to the embodiment of the present invention, and shows a state in which the ultrahigh pressure liquid is discharged. That is, FIG. 4 shows a state where the hydraulic piston 43 has moved to the liquid supply chamber 41 side (left side in the drawing).
FIG. 5 is a cross-sectional view for explaining the configuration of the booster of the hydraulic expansion molding apparatus according to the embodiment of the present invention, and shows a state where the liquid is supplied. That is, FIG. 5 shows a state where the hydraulic piston 43 has moved to the hydraulic chamber 42 side (right side in the drawing).

As shown in FIG. 4, the booster 4 reciprocates between a liquid supply chamber 41 filled with water that is a pipe expansion liquid, a hydraulic chamber 42 filled with pressure oil, and between the liquid supply chamber 41 and the hydraulic chamber 42. A hydraulic piston 43 and a plunger 43a which are moving pistons, and a return spring 48 which is a biasing means for biasing the hydraulic piston 43 toward the hydraulic chamber 42 are provided. In the liquid supply chamber 41, a liquid supply side check valve 46 for controlling the introduction of water and a discharge side check valve 47 for controlling the discharge of water are provided in a state of being attached to the valve seat 41a. .
The booster 4 is a pressure increasing device that pressurizes the water filled in the liquid supply chamber 41 with the pressure oil supplied to the hydraulic chamber 42. The booster 4 has a cross-sectional area of the liquid supply chamber 41 in order to obtain ultra-high pressure water necessary for pipe expansion. The cross-sectional area of the hydraulic chamber 42 is set larger than that.

  As shown in FIG. 4, the hydraulic chamber 42 is formed in a gap between a cylindrical hydraulic cylinder 4a having a flange 4b and a hydraulic piston 43 that reciprocates within the hydraulic cylinder 4a. The hydraulic piston 43 is configured as a stepped round bar having a large-diameter portion 43b provided on the liquid supply chamber 41 side and a small-diameter portion 43c provided on the opposite side. The small-diameter portion 43c is formed with an introduction hole 42a through which pressure oil flows in the central portion along the axial direction up to the large-diameter portion 43b. And the through-hole 43d connected to the hydraulic chamber 42 is radially formed in the front-end | tip at the side of the large diameter part of this introduction hole 42a.

  The return spring 48 is provided between the flange 4b of the hydraulic cylinder 4a and a spring receiver 48a provided on the distal end side (the right side in the drawing) of the small diameter portion 43c of the hydraulic piston 43. Therefore, the hydraulic piston 43 is urged by the return spring 48 in the direction of reducing the hydraulic chamber 42 (the right side in the figure) via the spring receiver 48a.

  In the present embodiment, the return spring 48 is used as the urging means, but the present invention is not limited to this, and fluid pressure such as air pressure or hydraulic pressure, and other pressurizing means can be appropriately employed. .

  With this configuration, the pressure oil supplied from the introduction hole 42 a is filled into the hydraulic chamber 42 through the through hole 43 d, and the pressure in the hydraulic chamber 42 is increased against the spring force of the return spring 48. In addition, since a round bar-shaped plunger 43 a is connected to the large diameter portion 43 b of the hydraulic piston 43, the plunger 43 a is configured to reciprocate within the liquid supply chamber 41 as the hydraulic piston 43 reciprocates. Yes.

As shown in FIG. 5, the liquid supply chamber 41 is formed in the cylinder 4c and is configured such that the volume of the liquid supply chamber 41 is changed by the movement of the plunger 43a.
In the liquid supply chamber 41, the liquid supply side check valve 46 is opened through the flow path 45 b (see FIG. 6B) formed in the valve seat 41 a from the liquid supply hole 45 a provided in the cylinder 4 c to expand the pipe. Filled with liquid.

At this time, the return spring 48 applies a spring force in the direction (the right side in the drawing) in which the plunger 43 a connected to the hydraulic piston 43 expands the liquid supply chamber 41. For this reason, the hydraulic piston 43 and the plunger 43a can be smoothly returned to the direction in which the liquid supply chamber 41 is expanded by the return spring 48 after the end of the pipe expansion.
Therefore, a liquid supply side pipe for returning the hydraulic piston 43 and a pressure increasing device such as a high-pressure type plunger pump become unnecessary, and the main body 3 (see FIG. 1) can be simplified as a whole. Moreover, since the supply pressure on the liquid supply side can be reduced, an inexpensive low-pressure liquid supply pump 52 (see FIG. 3) can be used.

Next, the configuration of the liquid supply side check valve 46 and the discharge side check valve 47 will be described with reference to FIG. FIG. 6 is a cross-sectional view of the main part of FIG. 4 showing the configuration of the check valve of the hydraulic expansion apparatus according to the embodiment of the present invention, (a) shows the discharge side check valve (A part of FIG. 4), (B) shows a liquid supply side check valve (part B in FIG. 4).
Since the liquid supply side check valve 46 and the discharge side check valve 47 have the same basic configuration, the liquid supply side check valve 46 will be described as an example with reference to FIG.
The liquid supply side check valve 46 includes a ball 46a which is a valve provided to close the liquid supply hole 45, a valve seat 46b which holds the ball 46a, and a spring which urges the valve seat 46b toward the liquid supply hole 45. 46c, and a valve cap 46d that accommodates the ball 46a and the spring 46c and holds the ball 46a and the spring 46c with respect to the liquid supply hole 45.

  With such a configuration, the valve cap 46d that houses and holds the ball 46a and the spring 46c is provided to have an integrated structure, so that the number of parts can be reduced and the size can be reduced, and the maintainability can be improved.

Moreover, in FIG. 6, the liquid supply state is shown. Therefore, as shown in FIG. 6A, the discharge side check valve 47 is held in the closed state, and the liquid supply side check valve 46 is held in the open state as shown in FIG. 6B.
On the other hand, although not shown, in the discharge state of the ultra-high pressure water, the discharge side check valve 47 is held in the open state, and the liquid supply side check valve 46 is held in the closed state. Such operation control of the liquid supply side check valve 46 and the discharge side check valve 47 can be performed, for example, by adjusting the spring force of the spring 46c and the spring 47c.

Then, the structure of the tube expansion tool part 2 is demonstrated, referring FIG. FIG. 7 is a cross-sectional view for explaining the configuration of the tube expanding tool part of the hydraulic tube forming apparatus according to the embodiment of the present invention.
The tube expansion tool unit 2 includes an ultrahigh pressure channel 23 that communicates with the seal unit 9 (see FIG. 1), and a pressure reducing valve 26 that is connected to the ultrahigh pressure channel 23 and discharges ultrahigh pressure water from the drain 27 to reduce the pressure. I have.
As shown in FIG. 7, the ultra-high pressure channel 23 is formed along the axial direction of a cylindrical mandrel adapter 23 a connected to the seal portion 9 and the tip portion 23 b.
And the ultrahigh pressure tube 11 is connected through the cross joint 21a connected so as to be orthogonal to the mandrel adapter 23a. A flow path 22 is formed in the cross joint 21a, and the flow path 22 and the flow path 11a of the ultra high pressure tube 11 are connected.

The pressure reducing valve 26 is joined to the other end side (right side in the figure) of the mandrel adapter 23a via a sealing cone 23c.
The pressure reducing valve 26 includes a cylinder 26a, a piston rod 26c inserted in the cylinder 26a, a valve 26d connected to the piston rod 26c, and a valve seat 26e joined to the valve 26d. The valve seat 26e is formed with a discharge passage 27a that communicates with the ultrahigh pressure passage 23.

On the other hand, as shown in FIG. 3, pressure oil is supplied from the hydraulic unit 6 through the flow path L5 to the hydraulic chamber 26b surrounded by the cylinder 26a and the piston rod 26c, and the switching valve 64 is switched to 26d and valve seat 26e are configured to be joined and separated. Further, the piston rod 26c is biased in a direction to open the valve 26d by a spring 26f.
Therefore, at the time of pipe expansion molding, the valve 26d and the valve seat 26e are joined and the pressure reducing valve 26 is closed, and after the pipe expansion molding, the valve 26d and the valve seat 26e are separated from each other to open the pressure reducing valve 26, and the ultrahigh pressure flow path The ultra-high pressure water in 23 is drained from the drain 27, and the seal part 9 (refer FIG. 1) is pressure-reduced.
The drain 27 is introduced into the main body 3 by the drain tube 13 and connected to the liquid supply tank 51 (see the flow path R in FIG. 3).

Next, the operation of the hydraulic expansion apparatus 1 according to the embodiment of the present invention will be described with reference to FIG. 3 assuming an actual diameter expansion operation.
A power switch (not shown) of the main body 3 is turned on to start the pipe expansion work. First, an air vent button (not shown) provided on the pipe expansion tool part 2 is pressed to supply a liquid supply circuit (flow path L1 to flow The air is vented from the path L2 to the ultrahigh pressure channel 23).
Specifically, when the air release button is pressed, the liquid supply pump 52 is activated, and the expanded liquid is sent from the flow path L1 through the booster 4 through the flow path L2 to the ultrahigh pressure flow path 23 and the pressure reducing valve 26. Then, the pressure returns from the pressure reducing valve 26 to the liquid supply tank 51 through the flow path R, and air is vented.

  As described above, the hydraulic expansion apparatus 1 according to the present invention can easily perform air bleeding without removing the piping, improving workability and reducing the burden on the operator. Further, by performing air bleeding together with flushing, high-precision pressure control becomes possible. And by increasing the compression efficiency of the expanded liquid, a synergistic effect of shortening the working time and extending the life of the seals can be expected.

Next, an operation button (not shown) of the hydraulic unit is pushed to set the pipe expansion pressure.
The expansion pressure can be set up to 400 MPa, and can be set in units of 1 MPa. Since the water pressure discharged from the booster 4 is directly detected by the pressure transducer 56, ± 1% (FS) can be realized with high accuracy. In the present embodiment, since the setting of the expansion pressure is digital display, it is easy to set and the visibility is good.

Then, the tube 9 is inserted into a tube such as a heat exchanger that expands the seal portion 9 attached to the tip of the tube expansion tool portion 2, and a tube expansion button (not shown) provided on the tube expansion tool portion 2 is pushed to start the tube expansion operation. To do. When the pipe expansion button is pressed, the hydraulic unit 6 is activated, pressure oil is supplied to the hydraulic chamber 42 of the booster 4, and the pipe expansion liquid in the liquid supply chamber 41 is increased. In this way, the ultra-high pressure water increased in pressure by the booster 4 is sent from the liquid supply chamber 41 to the tube expansion tool unit 2. During this time, the tube expansion button (not shown) is kept pressed.
Then, the inside of the aqua tube 92 (see FIG. 2) of the seal portion 9 is in an ultra-high pressure state, the pipe expands due to the pressure, and plastic deformation occurs, and the tube sheet is elastically deformed. A contact residual pressure is generated and can be permanently fixed. In this way, tube expansion is completed in a few seconds per tube.

  The end of the expansion is detected by detecting the pressure of the ultrahigh pressure water discharged from the booster 4 with the pressure converter 56, and compared with the set predetermined expansion pressure, and the end of the expansion is confirmed with a buzzer (not shown). Inform the worker. When the pipe expansion end buzzer comes, automatic pressure reduction or when the operator releases the pipe expansion button, the pressure reducing valve 26 is opened and the ultra high pressure water in the ultra high pressure channel 23 is decompressed. And the seal | sticker part 9 is extracted from a pipe | tube, and it inserts in the following pipe | tube, and repeats the same operation | work and performs a pipe expansion operation | work.

Since the hydraulic expansion apparatus 1 according to the present invention is configured as described above, the following effects are produced. The fluid pressure tube forming apparatus 1 according to the present invention separates the booster 4 from the tube expansion tool portion 2 and stores the booster 4 in the main body portion 3 so that the operator can hold the tube in his hand. The workability is improved by reducing the size and weight.
For this reason, while reducing the burden of the operator at the time of a continuous operation | work, the position alignment at the time of inserting the seal | sticker part 9 in a pipe | tube is made easy. Further, the booster 4 serving as a high-pressure source is separated from the operator's hand and stored in the main body 3 to further enhance safety.

  Further, the hydraulic expansion apparatus 1 according to the present invention does not detect the hydraulic pressure supplied to the booster 4 but directly applies the pressure of the ultrahigh pressure liquid discharged from the discharge hole of the booster 4 by the pressure converter 56. By detecting, the pressure of pipe expansion molding can be detected accurately. For this reason, highly accurate pressure management is possible and tube expansion quality can be improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented with appropriate modifications.
For example, in the present embodiment, as the liquid pressure tube forming apparatus 1, a tube expansion device in which an aqua tube type aqua mandrel is attached to the seal portion 9 has been described as an example. Thus, it is used not only as a pipe expansion but also as a metal forming apparatus in other fields.
Therefore, in the present embodiment, numerical values such as a tube expansion pressure as an example of a tube expansion molding device are shown, and the present invention is not limited to this, and tube expansion molding is performed according to the diameter and shape of the workpiece to be applied. The capacity, operation, and other specifications of the apparatus are set as appropriate.

In this embodiment, the end of the pipe expansion is notified by a buzzer, but the present invention is not limited to this, and it may be visible with a pilot lamp or the like. In this embodiment, the pressure reducing valve 26 is opened when the operator releases the tube expansion button. However, when the pressure detected by the pressure transducer 56 reaches a predetermined set value, a pilot lamp or the like is used. May be configured to be automatically decompressed. In short, the control method of the pressure reducing valve 26 is appropriately set in consideration of safety, workability, and the like.
Further, in the present embodiment, the pressure reducing valve 26 is configured to be controlled by hydraulic pressure, but is not limited thereto, and can be controlled by air pressure, or electromagnetic control can be employed. it can.

It is a perspective view for demonstrating the whole structure of the hydraulic expansion pipe forming apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the structure of the seal part which concerns on embodiment of this invention. 1 is a circuit diagram of a hydraulic expansion tube forming apparatus according to an embodiment of the present invention. It is sectional drawing for demonstrating the structure of the booster of the hydraulic-tube expansion molding apparatus which concerns on embodiment of this invention, and shows the state by which the ultrahigh pressure liquid was discharged. It is sectional drawing for demonstrating the structure of the booster of the hydraulic-tube expansion molding apparatus which concerns on embodiment of this invention, and shows the state supplied. It is principal part sectional drawing of FIG. 4 which shows the structure of the check valve of the hydraulic expansion pipe forming apparatus which concerns on embodiment of this invention, (a) shows a discharge side check valve (A part of FIG. 4), (b) Indicates a liquid supply side check valve (B portion in FIG. 4). It is sectional drawing for demonstrating the structure of the pipe expansion tool part of the hydraulic pressure pipe forming apparatus which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluid pressure expansion molding apparatus 2 Tube expansion tool part 3 Main body part 4 Booster 5 Liquid supply unit 6 Hydraulic unit 9 Seal part 11 Super high pressure tube 12 Hydraulic tube 13 Drain tube 23 Super high pressure flow path 27 Drain 41 Liquid supply room 42 Hydraulic room 43 Hydraulic piston (piston)
43a Plunger (piston)
44 Discharge hole 45 Fluid supply hole 46 Fluid supply side check valve 46a Ball (valve)
46b Valve seat 46c Spring 46d Valve cap 47 Discharge side check valve 47a Ball (valve)
47b Valve seat 47c Spring 47d Valve cap 48 Return spring (biasing means)
56 Pressure transducer (pressure detector)

Claims (5)

Equipped with a seal part that performs pipe expansion molding by the liquid pressure of the ultra high pressure liquid, and a pipe expansion tool part that injects the ultra high pressure liquid into the seal part,
A main body for supplying the ultra-high pressure liquid to the tube expansion tool portion, and the main body portion and the tube expansion tool portion are configured as separate bodies, and the tube expansion tool portion is held in the hand by the operator. A hydraulic expansion tube forming apparatus,
In the main body, a booster for expanding the pipe to be expanded into the ultra-high pressure liquid is discharged from the discharge hole, a liquid supply unit for supplying the expanded liquid to the booster, and a pressure for generating the hydraulic pressure in the booster. A hydraulic unit for supplying oil,
The liquid pressure of the ultra-high pressure liquid is the water pressure of ultra-high pressure water,
The tube expansion tool part is provided with an ultra-high pressure channel communicating with the seal part,
The ultra-high pressure flow path and the discharge hole of the booster are connected by an ultra-high pressure tube,
A pressure transducer for detecting the pressure of the ultrahigh pressure liquid discharged from the discharge hole of the booster is provided in the main body,
The booster includes a liquid supply chamber filled with the expanded liquid formed in a cylinder, a hydraulic chamber filled with the pressure oil, the liquid supply chamber and the hydraulic chamber, and the liquid supply chamber and the hydraulic chamber. A piston that reciprocates between and a biasing means that biases the piston toward the hydraulic chamber,
The piston has a large-diameter portion that is in sliding contact with the cylinder, a small-diameter portion that forms a gap in the cylinder, and an introduction hole into which the pressure oil flows along the axial direction in the center portion,
The hydraulic chamber is formed in a gap between the cylinder and the small diameter portion,
A hydraulic tube forming apparatus , wherein a radial hole is formed in the small-diameter portion, and a through-hole communicating from the introduction hole to the hydraulic chamber is provided .   2. The hydraulic pressure according to claim 1, wherein the tube expansion tool portion further includes a pressure reducing valve that is connected to the ultrahigh pressure flow path and discharges the ultrahigh pressure liquid from a drain to reduce the hydraulic pressure. Tube expansion forming device.   The hydraulic pressure expansion molding apparatus according to claim 2, wherein the pressure reducing valve is configured to be controlled by pressure oil supplied from the hydraulic unit. In the booster, a liquid supply hole that communicates with the liquid supply chamber and introduces the pipe expansion liquid, and a liquid supply side check valve that controls the introduction of the pipe expansion liquid into the liquid supply hole are provided,
The liquid supply side check valve includes a valve adapted to the liquid supply hole, a spring that urges the valve to the liquid supply hole, the valve and the spring, and holds the valve against the liquid supply hole. A fluid pressure tube forming apparatus according to any one of claims 1 to 3 , further comprising a valve cap. In the booster, a discharge side check valve for controlling discharge from the discharge hole communicating with the liquid supply chamber is provided,
The discharge-side check valve includes a valve adapted to the discharge hole, a spring that urges the valve to the discharge hole, a valve cap that houses the valve and the spring and holds the valve against the discharge hole. 4. The fluid pressure tube forming apparatus according to claim 1, comprising:

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