JP2003334620A - Hydroforming machine and press machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out low-cost and highly precise hydroforming. <P>SOLUTION: A mold is fastened by projecting a pair of guide portions 21a-22b from an upper mold holder 21 and a lower mold holder 22 respectively holding a pair of molds 30 receiving a stock pipe W, and outwardly fitting guide portions 21a-22b with a mold fastening blocks 25, 26 removable by cylinders 281-284 for blocks. The upper mold 21 slidably holds an upper mold 30a and has hydraulic cylinders 241-244 pressing the upper mold 30a. The pipe W is formed into a mold shape of the mold 30 with high precision, by supplying a compressed liquid into the stock pipe W with the mold fastened by the block 25, 26 and with the upper mold 30a pressed to the lower mold 30b with cylinder 241-244. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to molding a material pipe in a mold into a required shape with a pressure liquid, and more particularly to a hydroforming apparatus and a pressing machine which can maintain stable processing accuracy at low cost. .

[0002]

2. Description of the Related Art Recently, by supplying a pressurized liquid (usually high-pressure water) into a metal material tube housed in a mold, hydroforming has been performed to mold the material tube into a shape that matches the shape of the mold. Attention has been paid to various types of devices for performing this hydroforming.

FIG. 13 is a schematic view of a conventional mold clamping device 1 for hydroforming. The mold clamping device 1 includes a mold 3 including an upper mold 3a and a lower mold 3b in which a material tube W is housed,
The die 2 is fitted into the opening 2a of the character-shaped frame 2 and clamped, and a large number of press-up cylinders 4 are provided on the lower surface of the opening 2a, and the lower die 3b is pressed against the upper die 3a by each press-up cylinder 4. . In this way, the mold clamping device 1 reduces the influence of elastic deformation of the frame 2 due to the stress in the mold opening direction that occurs during molding, and improves the molding accuracy.

The mold clamping device 1 uses high-pressure water for forming the material pipe W to drive each of the pressure-up cylinders 4, and one end of the pipe line 6 extending from the pressure liquid supply means 5 is connected to the mold clamping device 1. It is connected to the mold 3 and the other end is connected to each pressure-up cylinder 4, and high-pressure water is circulated to each pressure-up cylinder 4 through the pipe line 6. Further, since the lower die 3b is pressed against the upper die 3a by each of the pressure-up cylinders 4 against the pressure of the high-pressure water supplied to the material pipe W, the sum of the cylinder cross-sectional areas of the respective pressure-up cylinders 4 is the material pipe W. It is designed to exceed the cross-sectional area of the molded product.

Although not shown in FIG. 13, the mold clamping device 1 is a mold moving means for moving the mold 3 into and out of the opening 2a of the frame 2, and a mold moving device moved outward from the opening 2a. An opening / closing means for opening / closing the upper mold 3a of the mold 3 is also provided.

[0006]

Since the circuit part related to the pressure-up cylinder 4 and the circuit part related to the molding of the material pipe W are in the same system, the pressure liquid is supplied to the material pipe W to the pressure-up cylinder 4. There is a problem in that it is difficult to independently adjust the pressure generation timing, the amount of pressurized liquid, etc. for the pressure-up cylinder 4 because it is linked to the supply of pressurized liquid. Further, in order to solve such problems, it is necessary to incorporate a necessary auxiliary hydraulic equipment such as a stop valve in the hydraulic circuit in order to independently adjust the pressure generation timing and the like, which complicates the circuit configuration. There is a problem.

Further, since the pressure-up cylinder 4 is driven by high-pressure water, a special cylinder for high-pressure water is used without applying a general hydraulic cylinder, which raises the cost of the mold clamping device 1. There is. Further, the mold clamping device 1 uses high-pressure water for which a pipe for forming a hydraulic circuit, a joint, a regulator for pressure adjustment, and the like are not common, and also a consumable product such as packing for a cylinder for high-pressure water. The replacement cycle is shorter than that for hydraulics, and if this is taken into consideration, there is also the problem that the cost of the mold clamping device 1 becomes even higher.

Further, since the mold clamping device 1 is premised on the use of the frame 2 having a special shape, there is a problem that it takes time to manufacture the frame 2. Further, in the mold clamping device 1, since the heavy mold 3 is put in and taken out from the opening 2a of the frame 2, a moving means having a large thrust is required and the metal moved to the outside of the opening 2a is required. There is a problem that the opening / closing means for opening / closing the upper mold 3a of the mold 3 must be provided exclusively.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a hydroforming apparatus capable of forming a highly accurate processed product at low cost without providing a frame having a special shape. . Another object of the present invention is to provide a press machine equipped with a hydroforming device capable of opening and closing the mold without providing a dedicated mold opening / closing means.

[0010]

According to a first aspect of the present invention, there is provided a hydroforming apparatus, wherein a pair of mold holders respectively holding a pair of molds containing metal material tubes are clamped by a mold clamping means, In a hydroforming apparatus for forming the material pipe into the mold shape of the mold by supplying a pressure liquid into the material pipe by a pressure liquid supply means, one of the pair of mold holders is the mold. , Which is held so as to be slidable in the mold clamping direction, is provided in the one mold holder, presses the mold in the mold clamping direction, and supplies a driving pressure to the cylinder. Drive pressure supply means.

According to the first aspect of the invention, since the driving pressure supply means is provided separately from the molding pressure liquid supply means to drive the cylinder, the cylinder can be stably and independently irrespective of the supply of the pressure liquid for molding. It is possible to drive with, and surely press against the mold opening force of the mold at the time of molding to secure the required molding accuracy. Further, by providing the driving pressure supply means independently as described above, general hydraulic pressure can be applied to the cylinder and the driving pressure supply means, and the cost of the apparatus can be reduced as compared with the conventional one.

Furthermore, the first invention does not require a special frame or the like to clamp the molds, and has a simple structure in which the pair of mold holders for holding the pair of molds is clamped by the mold clamping means. Therefore, it can contribute to cost reduction.

In the hydroforming apparatus according to the second aspect of the present invention, the pair of mold holders has a pair of projecting guide portions, and the mold clamping means can fit the pair of guide portions on the outside. It is a ring-shaped clamping block,
It is characterized by comprising a moving means for moving the mold clamping block from the non-outer fitting position to the outer fitting position with respect to the pair of guide portions.

According to the second aspect of the present invention, each mold holder is provided with a pair of guide portions and a ring-shaped mold clamping block is used as the mold clamping means. The mold can be easily clamped by external fitting. Further, since the ring-shaped mold clamping block has no openings in the periphery, it has high rigidity and can be clamped against the mold opening force.

In order to perform the mold clamping reliably, it is preferable to provide the pair of guide portions at least at two or more places, and it is necessary to provide the mold clamping blocks according to the number of the pair of guide portions. Further, the mold clamping block preferably has a ring-shaped internal height dimension that has a required clearance dimension with respect to the thickness dimension of the pair of guide portions in order to secure the ease of external fitting and the stroke of the cylinder. .

Further, by making the mold clamping block movable by the moving means, the mold clamping can be smoothly performed. The moving means may move the mold clamping block linearly, or may rotate the mold clamping block with the end or the like as a fulcrum.

In the hydroforming apparatus according to the third aspect of the present invention, the mold clamping means is a C-shaped mold clamping block, and the mold clamping block is clamped from a position separated from the pair of mold holders. It is characterized in that it is provided with a moving means for moving to a position where it is possible.

According to the third aspect of the present invention, by using the C-shaped mold clamping block as the mold clamping means, the mold clamping can be reliably performed regardless of the shape of the molded product to be processed. That is,
When the molded product to be processed has a large size or a curved shape, it may be difficult to provide a pair of guide portions on each mold holder as in the second invention. In such a case, C With the V-shaped mold clamping block, a pair of mold holders can be directly sandwiched to achieve reliable mold clamping. Also in the third invention, by providing the moving means for moving the mold clamping block, the mold can be opened and closed without the mold clamping block interfering.

A press machine according to a fourth aspect of the present invention comprises the hydroforming device installed on a press base, and one of the pair of mold holders is connected to a vertically moving press part. Characterize.

According to the fourth aspect of the present invention, by combining the hydroforming apparatus and the press machine, the mold can be opened and closed by utilizing the vertical mechanism of the press machine.
Pressing machines are generally highly versatile, and second-hand pressing machines are often available at a low price in the second-hand market, and there are many unused pressing machines in factories. Therefore, by installing a hydroforming device inside such a press machine and opening and closing the mold with the press machine, an unused press machine can be effectively used, and a die dedicated to the hydroforming device can be effectively used. It is not necessary to provide the opening / closing mechanism of

Since the pressing machine according to the fourth invention only opens and closes the mold of the hydroforming device, it does not require a highly accurate operation, and the thrust and the material tube that can lift one mold can be installed. As long as it has a stroke that can secure a space that can be used, it can be sufficiently applied to a used press machine or the like. Further, the pressure oil supply means for driving the press machine may be used to supply the pressure oil to the die pressing cylinder of the hydroforming apparatus.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing the embodiments thereof. 1 and 2 are front views of a die opening state of a press machine 10 including a hydroforming device 20 according to the first embodiment of the present invention. In this embodiment, the frame portion 1 serving as the press base of the press machine 10
The hydroforming device 20 is installed at 0a,
In the upper die holder 21 of the hydroforming device 20,
Press unit 1 that moves up and down by expansion and contraction of press rod 10b
0c is connected. 1 shows a state in which the pressing unit 10c is raised to open the mold 30, and FIG. 2 shows a state in which the pressing unit 10c is lowered to close the mold 30.

As shown in FIG. 3, the hydroforming apparatus 20 includes an upper die 30a and a lower die 30 of a pair of dies 30.
Metal material tube W by clamping b at the required pressure
In the mold, and in this state, high-pressure water is supplied into the pipe of the material pipe W from the water pressure introduction adapters 31a and 31b provided at both ends of the lower mold 30a to mold the material pipe W into the mold shape of the mold 30. It is a thing. As shown in FIGS. 1 and 2, the lower mold 30b is held by the lower mold holder 22 fixed to the base portion 20a, and the upper mold 30a is fixed to the upper mold holder 21 that is paired with the lower mold holder 22. Is held.

Upper mold holder 21 and lower mold holder 22
Is formed in a substantially rectangular parallelepiped shape with a material having a required rigidity, and has a pair of guide portions 21a, 21b, 22a, 22b protruding horizontally from both left and right sides in FIG. The projecting dimensions of the guide portions 21a and 21b of the upper mold 21 are shorter than those of the guide portions 22a and 22b of the lower mold 22 so that the left and right mold clamping blocks 25 and 26, which will be described later, do not interfere with each other. The upper die holder 21 can be opened and closed. Further, as shown in FIG. 4, the longitudinal dimension (depth dimension) of each of the guide portions 21a, 21b, 22a, 22b is the upper die holder 21 and the lower die holder 2
Shorten both sides from the dimension of 2 to make mold clamping blocks 25, 2
6 is set within the dimensions of the upper mold holder 21 and the like.

As shown in FIG. 1, the upper die holder 21 is provided with sliding portions 21d and 21e on the left and right side walls of an accommodating recess 21c for accommodating and retaining the upper die 30a, so that the upper die 30a is held. So that it can slide up and down smoothly. Further, the upper surface portion 21f of the accommodation recess 21c has a structure shown in FIG.
As also shown in FIG. 4, a total of four hydraulic cylinders 241 to 244 are provided at intervals in the longitudinal direction of the upper mold holder 21.

Each of the hydraulic cylinders 241 to 244 has a cylinder diameter such that the total thrust can be made larger than the force in the opening direction of the die 30 generated by the pressure liquid supplied at the time of forming the material pipe W. Also, each hydraulic cylinder 241 to
The stroke length of 244 is the mold clamping block 26 and the guide portion 21b of the upper mold holder 21 shown in FIG.
A dimension slightly longer than the clearance dimension C between and is secured. The hydraulic cylinders 241 to 244 are connected to the upper surface of the upper die 30a, and the hydraulic cylinders 241 are connected to each other.
The upper mold 30a can be moved up and down by driving ~ 244.

Further, the hydroforming device 20 is
As shown in FIGS. 2 and 6A, mold clamping blocks 25 and 26 are provided on the left and right of the lower mold holder 22 as mold clamping means so as to be able to approach and separate from each other. Mold clamping blocks 25, 26
Have the same shape. As shown in FIG. 5 (a), one mold clamping block 26 will be explained.
Is a substantially rectangular ring shape capable of externally fitting the pair of guide portions 21b, 22b in a state where the upper mold holder 21 and the lower mold holder 22 are in contact with each other when the mold is closed. The dimension is such that a rigidity force that resists the force in the direction in which the mold 30 is opened during molding can be secured.

Further, as shown in FIG. 5B, the height dimension H of the hollow portion 26b of the mold clamping block 26 is determined by the thickness of the guide portion 21b of the upper mold holder 21 and the lower mold holder 22.
The size is set to be slightly larger than the total size of the guide portions 22b. As a result, the mold clamping block 26
The bottom surface of the hollow portion 26b of the lower mold holder 22
When the mold clamping block 26 is externally fitted to the guide portions 21b and 22b while being in contact with the lower surface of 2b, the upper mold holder 2
The clearance dimension C can be secured for the first guide portion 21b.

Further, as shown in FIGS. 1, 2, and 4 etc., the lower surfaces of the mold clamping blocks 25 and 26 are attached to the linear motion guides 271 to 274 fixed to the base portion 20a, respectively.
Further, rod tips of block cylinders 281 to 284, which are moving means, are connected to lower portions of outer surfaces of the mold clamping blocks 25 and 26.

By providing the linear motion guides 271 to 274 and the block cylinders 281 to 284 described above,
As shown in FIG. 6, the mold clamping blocks 25 and 26 are retracted with respect to the upper mold holder 21 and the lower mold holder 22 by contracting the rods 281a to 284a of the block cylinders 281 to 284. By extending the rods 281a to 284a as shown in a), the mold clamping blocks 25 and 26 are advanced.

In the retracted state of FIG. 2, the mold clamping blocks 25 and 26 are guide portions 21a, 21b, 22a and 22.
6B is a position where the guide portion 21a, 21b, 22a, 22b is not fitted, and is a position where the guide portion 21a, 21b, 22a, 22b is fitted. Further, when the mold clamping blocks 25, 26 are advanced, the clearance dimension C is secured as shown in FIG. 5B, so the mold clamping blocks 25, 26 are smoothly advanced and the guide portions 21a, 21b. , 22a, 2
2b is externally fitted to the upper mold holder 21 and the lower mold holder 22.
Is clamped.

On the other hand, FIG. 7A shows a hydraulic circuit 40 for molding in the hydroforming apparatus 20. The hydraulic circuit 40 extends a pipe 42 from a high pressure water supply means 41, which is a pressurized liquid supply means, and connects it to water pressure introduction adapters 31a and 31b provided at both ends of the lower mold 30b.
High-pressure water is supplied to the inside of the material pipe attached to b.

Further, FIG. 7B shows a hydraulic circuit 45 for driving various cylinders in the hydroforming apparatus 20.
Is shown. The hydraulic circuit 45 connects the first switching valve 481 and the second switching valve 482 to the hydraulic pipe 47 divided into two parts from the pressure oil supply means 46 which is the drive pressure supply means, and blocks the first switching valve 481. The block cylinders 281 to 284 are connected to each other via a pressure pipe 491, and the hydraulic cylinders 241 to 244 are connected to the second switching valve 482 via a pressing pipe 492.

The hydroforming device 20 is provided with a first switching valve 481 by operating switches and buttons (not shown).
And the valve positions of the second switching valve 482 are appropriately switched to drive the block cylinders 281 to 284 and the hydraulic cylinders 241 to 244, and the mold clamping blocks 25 and 26.
Is moved, and the upper mold 30a is pressed in the mold clamping direction.

Next, the procedure for forming the material pipe W by the press machine 10 equipped with the hydroforming device 20 described above will be explained. First, as shown in FIG. 1, the press section 10c of the press machine 10 is lifted to open the mold, and the material tube W is mounted in the mold of the lower mold 30b. Next, the press machine 10 is operated to lower the press part 10c as shown in FIG. 2 to close the mold.

In this state, the hydroforming device 20
6A, the mold clamping blocks 25, 26 are moved forward to move the guide portions 21a, 21b, 22 as shown in FIG. 6A.
a and 22b are externally fitted and the upper die 30a and the lower die 30b are clamped. By performing the mold clamping in this way, the material pipe W conforms to the shapes of the upper mold 30a and the lower mold 30b.

After the mold is clamped, as shown in FIG. 6 (b),
The hydraulic cylinders 241-244 are driven to press the upper mold 30a in the mold clamping direction. By this pressing, the upper mold 30a
Is slid against the lower die 30b and pressed firmly, and as a result, there is a clearance between the upper die holder 21 and the lower die holder 22 that is the same as the clearance dimension C shown in FIG. 5B. Has occurred.

With the upper die 30a and the lower die 30b firmly clamped in this manner, the hydroforming device 20
To operate the high pressure water supply means 41 of FIG.
A liquid having a pressure P is supplied into the material pipe W to mold the material pipe W into a shape that matches the shape of the mold 30.

Further, at the time of this molding, a force that pushes the mold 30 up and down is generated by the pressure P applied to the inside of the material pipe W, but when the molding pressure P is applied, the pressure liquid is already generated. Hydraulic cylinder 24 which is a system separate from supply
Since the mold 30 is clamped in a strong and stable state by 1 to 244, the mold 30 can be maintained in the prescribed mold shape from beginning to end, thereby ensuring high-precision moldability.

After molding, the supply of the pressure liquid is stopped and the hydraulic cylinders 241 to 24 are operated in the reverse order of the above-mentioned procedure.
4 is returned to its original position, the mold clamping blocks 25 and 26 are retracted, and then the press section 10c of the press machine 10 is lifted to open the mold and take out the molded product.

The hydroforming device 20 is not limited to the above-described form, but various modifications are possible. For example, the number and arrangement of the hydraulic cylinders 241 to 244 are not limited to those shown in FIG. 4, and the number and arrangement according to the shape of the product to be molded can be applied. For example, five hydraulic cylinders can be arranged in a row. It is possible to arrange them with a space between them and to arrange three hydraulic cylinders in two rows.

Further, such a hydraulic cylinder may be provided in the lower mold holder 22 instead of being provided in the upper mold holder 21, and in this case, the lower mold 30b is slidable in the lower mold holder 22. Alternatively, the lower die 30b may be held and pushed up by a hydraulic cylinder to firmly clamp the die. Further, a pressure oil tank or the like in the pressure oil supply unit of the press machine 10 may be shared with the pressure oil supply means 46 of FIG. 7B.

Furthermore, as shown in the hydroforming apparatus 50 of FIGS. 8A and 8B, the upper mold holder 5 is
1 and the guide portion 51a protruding from the lower mold holder 52
The guide portions 51a to 51d and 52a to 52d are provided while the guide portions 51a to 51d and 52a to 52d are not continuous and are divided.
mold clamping blocks 551, 552, 561, which are fitted with d
562 may also be divided. By dividing like this,
Individual mold clamping blocks 551, 552, 561, 562
8A and 8B, the hydroforming device 50 shown in FIGS. 8A and 8B is suitable for molding a large product.

FIG. 9 shows another modification of the hydroforming apparatus 60, in which the right and left mold clamping blocks 65 and 66 are not moved horizontally, but a block cylinder 68.
With 1,682, the rotation fulcrums 65c and 66c are rotated to perform mold clamping. In this case, when the upper end portions of the guide parts 61a and 61b of the upper mold holder 61 are curved and the mold clamping blocks 65 and 66 are used for mold clamping, the guide parts 61a and 61 are smoothly guided without interference.
b, 62a, and 62b can be externally fitted.

FIG. 10 shows another modification of the hydroforming apparatus 70. The hydroforming apparatus 70 is not installed in the press machine, but has an opening / closing mechanism for the upper die holder 71. Specifically, a plurality of columns 70b are erected from around the base portion 70a for fixing the lower die holder 72,
A top plate 70c is attached to the upper ends of the columns 70b, and upper and lower cylinders 791 and 792 are fixed to the top plate 70. In addition, a moving member 7 is vertically movable on each of the columns 70b.
0d is attached, the tips of the rods 791a and 792a of the upper and lower cylinders 791 and 792 are connected to the upper surface of the moving member 70d, and the upper die holder 71 is attached to the lower surface.

Therefore, the hydroforming device 70
Are rods 791a, 7 of the upper and lower cylinders 791, 792.
By contracting 92a, the moving member 70d is raised to open the mold, and from this state, the rods 791a and 792a are extended to lower the moving plate 70d to close the mold. Therefore, the hydroforming device 70 is
Without combining with the press machine as shown in Figs.
It is possible to carry out a series of treatments independently to perform required molding.

11 (a) and 11 (b) show a hydroforming apparatus 80 according to the second embodiment of the present invention.
7 to 7 of the hydroforming apparatus 20 of the first embodiment, the guide parts do not project to the pair of upper mold holder 81 and lower mold holder 82 that respectively hold the pair of molds 90, and The difference is that the mold clamping blocks 85 and 86 which are the mold clamping means on both sides are C-shaped.

In this embodiment, the shape of the product to be molded is wide on the left and right, and the upper die holder 81 and the lower die holder 8 are formed.
Since the size is further increased when the guide portion is provided in 2, the upper mold holder 81 and the lower mold holder 82 themselves are directly clamped by the mold clamping blocks 85 and 86 in order to prevent the increase in size. I have to. Since the mold is clamped in this manner, the lower mold holder 82 fixed to the base portion 80a.
Recesses 82c and 82d are formed on both left and right sides of the.

The height dimensions of the mold clamping recesses 85a and 86a of the mold clamping blocks 85 and 86 are as follows.
1 and the thickness dimension of the lower die holder 82 where the die is clamped in the closed state, as shown in FIG.
As with, the clearance dimension is secured. Except for the above-mentioned locations, the hydroforming apparatus 10 of the first embodiment has substantially the same configuration. For example, the upper die holder 81 is provided with a plurality of hydraulic cylinders 841.
The left and right mold clamping blocks 85 and 86 are attached to the linear motion guides 871 and 872 fixed to the base portion 80a, and the block cylinders 881 to 88 that are moving means.
The rod tips of 4 are connected.

In the hydroforming apparatus 80, the material tube can be formed into a shape corresponding to the shape of the mold 90 as in the first embodiment, and since it has the above-mentioned configuration, the shape of the molded product, etc. Therefore, it is suitable when it is difficult to provide the upper die holder 81 and the lower die holder 82 with the guide portions as in the first embodiment. The various modifications of the first embodiment can be similarly applied to the hydroforming device 80 of the second embodiment.

FIG. 12 shows a hydroforming device 90 according to a modification of the second embodiment. The hydroforming device 90 corresponds to a long molded product,
A total of eight C-shaped mold clamping blocks 951 to 95 on the left and right sides of the pair of upper mold holder 91 and lower mold holder 92.
4, 961 to 964 are used for mold clamping. In particular, the mold clamping blocks 951, 954, 961, 964
Since the upper mold holder 91 and the lower mold holder 92 are clamped at the four corners, uniform mold clamping is realized.

[0052]

As described above in detail, in the first aspect of the invention, the mold is pressed by the drive pressure supply system different from the pressure liquid supply system for forming the material pipe, and then the pressure liquid is supplied. Since molding is performed with no special frame, highly accurate molding can be stably performed at low cost.

According to the second aspect of the present invention, the pair of guide portions provided on each mold holder are clamped by the mold clamping block having a ring shape and rigidity, so that stable and reliable mold clamping can be performed. According to the third aspect of the invention, since the pair of mold holders are directly clamped by the C-shaped mold clamping block, the mold holders can be clamped regardless of the shape of the molded product.

In the fourth invention, since the press machine is used for opening and closing the mold of the hydroforming apparatus,
It is not necessary to provide a dedicated die opening / closing means in the hydroforming device, and it is possible to effectively use a used press machine or an unused press machine in the factory.

[Brief description of drawings]

FIG. 1 is a front view of a mold opening state of a press machine including a hydroforming device according to a first embodiment of the present invention.

FIG. 2 is a front view of the die closed state of the press machine including the hydroforming device according to the first embodiment.

FIG. 3 is a schematic perspective view showing a pair of molds and a material tube.

FIG. 4 is a plan view taken along the line AA in FIG.

5A is a side view from the direction B in FIG. 2, and FIG. 5B is an enlarged view of a main part of FIG.

FIG. 6A is a front view of the hydroforming apparatus in a mold clamped state, and FIG. 6B is an enlarged view of a main part during molding.

FIG. 7A is a hydraulic circuit diagram, and FIG. 7B is a hydraulic circuit diagram.

FIG. 8 is a hydroforming apparatus of a modified example of the first embodiment, in which (a) is a plan view and (b) is a side view.

FIG. 9 is a front view of a hydroforming device according to another modification of the first embodiment.

FIG. 10 is a front view of a hydroforming device according to another modification of the first embodiment.

FIG. 11 is a hydroforming apparatus according to a second embodiment of the present invention, (a) is a front view and (b) is a plan view.

FIG. 12 is a plan view of a hydroforming device according to a modified example of the second embodiment.

FIG. 13 is a schematic view of a conventional mold clamping device for hydroforming.

[Explanation of symbols]

10 Press machine 10a frame part 10c Press department 20 Hydroforming device 21 Upper mold holder 21a, 21b, 22a, 22b Guide part 21d, 21e sliding part 22 Lower mold holder 25, 26 mold block 30 molds 30a Upper mold 30b lower mold 46 Pressure oil supply means 241 to 244 hydraulic cylinder 281-284 Block cylinder W material tube

Claims (4)

[Claims] 1. A pair of mold holders respectively holding a pair of molds for accommodating a metal material tube are clamped by a mold clamping means, and a pressure liquid is supplied into the tube of the material tube by a pressure liquid supply means. In the hydroforming apparatus for forming the material pipe into the mold shape of the mold by doing so, one of the pair of mold holders holds the mold so that it can slide in the mold clamping direction. The hydroforming includes a cylinder provided in the one mold holder and configured to press the mold in a mold clamping direction, and a driving pressure supply unit that supplies a driving pressure to the cylinder. apparatus. 2. The pair of mold holders includes a pair of projecting guide portions, and the mold clamping means is a ring-shaped mold clamping block to which the pair of guide parts can be fitted. The hydroforming device according to claim 1, further comprising a moving unit that moves the mold clamping block from the non-outer fitting position to the outer fitting position with respect to the pair of guide portions. 3. The mold clamping means is a C-shaped mold clamping block, and moves the mold clamping block from a position separated from the pair of mold holders to a position where mold clamping is possible. The hydroforming apparatus according to claim 1, further comprising moving means. 4. The method according to claim 1, wherein the press base is installed.
A press machine comprising the hydroforming device according to any one of claims 1 to 3, wherein one of the pair of mold holders is connected to a vertically moving press part.