JPH01273624A - Fluid-pressure fabrication device - Google Patents

Abstract

PURPOSE: To prevent breaking and extreme decrease of thickness of a deep drawing product by placing a blank on a die with a hydraulic pressure chamber closed, holding a peripheral part of the blank with a pressurizing disk and giving a holding force in a reverse direction to the descending direction of a piston or a cylinder of the hydraulic pressure chamber. CONSTITUTION: A blank B is placed on a die 5. The blank B is held by a pressurizing disk 10 and a hydraulic pressure chamber 6 is closed. At this time, by a holding force giving means 12, a holding force in a reverse direction to the descending direction of a cylinder 4 is given. Further, the pressurizing disk 10 is made to descend, and by the descending of the cylinder 4 the hydraulic pressure chamber 6 is pressurized, and the blank B is reversely bulged. Then, a punch 8 is lowered and the deep drawing of the blank B is executed. Thereby, breaking and extreme decrease of thickness of deep drawing product are prevented.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a fluid pressure forming processing device, which is used to draw blank materials such as thin plates to obtain automobile parts, electrical parts, aircraft parts, etc. used.

(Prior Art) A dome having a die and a fluid pressure chamber opened on the die side; a punch disposed opposite the dome so as to be able to enter the fluid pressure chamber from the die side; and a dome disposed opposite the dome. Fluid pressure forming is equipped with a pressure plate that can be pressed on the side, and draws a blank material with a fluid pressure chamber closed on the die using fluid pressure by entering the punch into the fluid pressure chamber. The processing equipment is specified in the "Press Processing Handbook" published on October 25, 1975 as a hydroforming method.
It is known from page 498, and it is also known as
It is also disclosed in Publication No. 69 and the like.

(Problem B that the invention seeks to solve) Although the conventional technology described above has advantages such as being able to easily obtain high pressure and applying pressure uniformly compared to molding with rubber, the dome is fixed. Therefore, during molding, the pressure within the fluid pressure chamber must be adjusted using a pressure regulating device such as a throttle valve, which poses the following problems.

First, there is a serious drawback in that when the fluid (liquid) in the chamber is forced out through the throttle valve, significant energy loss is involved.

Furthermore, the compressed liquid must be resupplied into the chamber before the next molding process begins, which means time loss and reduces the working speed (processing speed). There is a problem with constraints on production cycle time.

In addition, pressure regulators are susceptible to liquid contamination and are therefore susceptible to dust and other contaminants that may arise from the workpiece (blank), which can disrupt processing operations. There is a problem with this.

In addition, prior to drawing forming using opposing hydraulic pressure with a punch, the forming portion of the blank material held between pressure plates is stretch-formed using opposing hydraulic pressure in the opposite direction to the direction in which the punch enters, and then drawing forming with the punch is performed. In the molding method that performs stretch molding, it is necessary to supply liquid from the outside into the chamber using a pump or the like, which requires a fluid supply device, which complicates the device and makes it difficult to supply the liquid. Time becomes a time loss and is accompanied by restrictions on work speed (processing production cycle time).

Furthermore, in order to accurately determine the amount of stretch molding, it is necessary to accurately control the amount of liquid to be supplied or to measure the actual amount of stretch molding, which is extremely difficult.

The present invention provides a fluid pressure forming processing apparatus that does not require excessive design of the press for the workpiece, minimizes energy loss, and improves the production cycle time of the press. This is the first purpose.

Furthermore, a second object of the present invention is to provide a fluid pressure forming processing apparatus that does not require a pressure regulating device for discharging a pressure medium from a chamber and is easier to control.

Further, in the above-mentioned stretch molding, the present invention does not require the supply of liquid from the outside into the chamber, and the amount of stretch molding can be easily adjusted. By ensuring sufficient clamping force and maintaining this clamping force until drawing by the opposing hydraulic pressure, the forming part of the blank material that is sandwiched between the pressure plates can be stretched out by the opposing hydraulic pressure in the opposite direction to the direction in which the punch enters. Sufficient pressure can be obtained for forming, and during the stretch forming process, leakage of pressure medium from between the blank material and the die can be minimized, ensuring a highly accurate amount of stretch forming, and during drawing forming. A third object of the present invention is to provide a fluid pressure forming processing apparatus that can reliably prevent breakage of blank materials and products and extreme reduction in the thickness of products.

(Means for Solving the Problems) The present invention provides a dome 1 having a die 5 and a fluid pressure chamber 6 opened on the die 5 side, and a dome 1 having a fluid pressure chamber 6 opened from the die 5 side.
A punch 8 disposed facing the dome l so as to be able to enter the inside of the die, and a pressure plate 10 disposed facing the dome 1 and capable of pressing independently of the punch 8 on the dome 1 side. The blank material B is placed in the fluid pressure chamber of the punch 8 while the periphery of the die 5 of the blank material B on which the fluid pressure chamber 6 is closed is sandwiched between the dome 1 side and the pressure plate 10 side. 6, the following technical measures are taken to achieve the stated purpose.

That is, in the present invention, the dome 1 is composed of a piston 3 and a cylinder 4, and either the piston 3 or the cylinder 4 is fixed or stationary, and the other is relatively moved to pump the fluid in the fluid pressure chamber 6. It is designed to maintain a predetermined molding pressure without discharging from the fluid pressure chamber 6, and furthermore, the periphery of the die 5 of the blank material B with the fluid pressure chamber 6 closed is placed between the dome 1 side and the pressure plate 10. When the movable member side of either the piston 3 or the cylinder 4 of the dome 1 is lowered by clamping with the cooperation of the Features.

(Function) According to the present invention, the cylinder (movable member) 4 forming a part of the dome 1 at the initial position is in the normal lowered position (initial position).

At this initial position, the fluid pressure chamber 6 is placed on the die 5.
A blank material B such as a steel plate is placed so as to close it, and the pressure plate 10 is lowered to sandwich the blank material B around the opening portion 5A with the cooperation of the pressure plate 10 and the dome 1 side, and along with this pinching, By applying hydraulic pressure via the rising boat 15B of the cylinder tube 15 in the clamping force applying means 12, a force is applied to the cylinder 4 in the opposite direction to the pressing direction of the pressure plate 10 (the downward direction). The initial clamping force of the blank material B between the press plate 10 and the die 5 is ensured.

Thereafter, when the pressure plate 10 is lowered further, the cylinder 4 is lowered against the pushing up force of the clamping force applying means 12, and the fluid pressure chamber 6 is moved while maintaining the clamping area around the blank material. is compressed, sufficient pressure is generated to reverse stretch mold the blank material B using the opposing hydraulic pressure, and the blank material B is reverse stretch molded here (see Fig. 2).

That is, since the fluid pressure chamber 6 is closed with the blank material B, the opposite hydraulic pressure P0 is generated when the cylinder 4 descends, and reverse overhang molding is performed. It is determined by the size of the distance from the adjusting male screw 32 as a stopper.

When the lower end surface of the cylinder 4 comes into contact with the stopper, the hydraulic pressure of the cylinder tube 15 on the rising boat 15 is released.

Next, when the punch 8 is introduced into the fluid pressure chamber 6 from the die 5 side, the pressure medium capacity in the fluid pressure chamber 6 increases! 'In this illustrated example, the cylinder 4 of the dome 1 is
As shown in FIG. 3, the fluid pressure P in the fluid pressure chamber 6 generated by the pressurizing force F of the punch 8 and the pressurizing force F of the pressurizing plate 10 causes hydrostatic forming using the punch 8 as a male mold. And drawing forming is done.

In this case, the punch 8 will start drawing after pressing down the blank material B that has been subjected to reverse stretch forming, and the stretched blank material B will be able to reach the head of the punch 8 without causing local elongation. By contacting a large area of and being restrained by frictional force due to the opposing hydraulic pressure P, the dangerous breakage section due to drawing force becomes longer, preventing breakage and reducing the extreme thickness of the formed product. Decrease is also prevented.

In this way, a predetermined deep drawing is carried out using the opposing hydraulic pressure P using the punch 8 as the male die (see FIGS. 3 and 4).

After the predetermined forming, when the punch 8 and the pressure plate 10 are raised, the cylinder 4 side of the dome 1 is lowered by their own weight or by the lowering force caused by switching the clamping force applying means 12.
It is held in a predetermined regular position.

(Examples) Hereinafter, some specific examples of the present invention will be described in detail with reference to the drawings.

1 to 4 show a first embodiment of the present invention and its operation, in which 1 is a dome, a piston 3 is fixed or stationary on a base 2, and a piston 3 is slidably fitted into the dome. A die 5 having an opening portion 5A is mounted on the cylinder 4 to form a fluid pressure chamber 6 therein.

A seal 7 is provided at the sliding portion between the piston 3 and the cylinder 4 to prevent leakage of the incompressible pressure medium contained in the fluid pressure chamber 6.

In the illustrated example, the piston 3 is fixed or stationary on the base 2, and the cylinder 4 is slidably fitted therein. It may be movable, and in any case, it is sufficient that either the piston 3 or the cylinder 4 is a fixed or stationary member and the other is a movable member that is relatively movable.

A punch 8 is placed facing the dome 1 so as to be able to enter into the fluid pressure chamber 6 from the die 5 side. connected.

Note that this bunch 8 serves as a so-called male mold during drawing, and the cross-sectional area A of the punch 8 is the same as that of the fluid pressure chamber 6.
(piston 3) is made smaller than the cross-sectional area A1, and the axis of the fluid pressure chamber 6 and the axis of the bunch 8 are aligned with each other.

10 is a pressure plate, and the top surface of the dome 1,
A pressing force F can be applied to the cylinder 4 substantially via the die 5.

In the illustrated example, the press plate 10 presses the blank material B against the die 5, but a cylinder controlled by another pressure device is provided in the press plate 10, and the blank material is pressed at the bottom of the cylinder. A separate pressure plate may be provided to independently control the pressing force of the blank material.

In this case, a part of the press plate 10 is brought into direct contact with the surface of the die 5 or the cylinder 4, and the press force F of the piston rod 11 is combined with the press force of the blank material by the separate press plate and the press plate 10 directly into the dome. It can be divided into 1 and the pressing force.

However, since the pressing force of the blank material is naturally transmitted to the dome 1, the force received by the dome 1 is the same as the pressing force F1.

12 is a clamping force applying means, and in this embodiment, the piston 1
3 and a cylinder tube 15 into which the piston 13 is slidably fitted. Connect the cylinder tube 15 to the bracket 16 on the base 2 side.
And it is pivoted with bottle 17.

Reference numeral 18 denotes a control system, which applies vertical force to the clamping force applying means 12 and enables speed control in its operation. 15B are connected to circuits 19 and 20 respectively, and between the pressure source boat 21, there is a position 22A where force is applied in the upward direction to the clamping force applying means 12, a position 22B where force is applied in the downward direction, and no force is generated in the vertical direction. A switching means 22 represented by a switchable switching valve is provided at each position 22C, and the switching valve is further provided with a speed control section consisting of a throttle valve 22A at the position 22A and a throttle valve 24B at the position 22B. is provided. The switch S1 provided on the pressure plate 10 and the switch receiver S2 provided on the die 5
When it is pinched, the contact is closed and the switching means 22 is switched in the push-up direction. Further, when the cylinder 4 descends and comes into contact with the head of the male screw 32 of the extension amount adjusting means 30, the switching means 22 switches the vertical force by a switch S3 provided at the lower end of the cylinder 4. Switched to be released.

In the illustrated embodiment, the pressure source boat 21 is a hydraulic pressure source such as oil, a pneumatic pressure source, or the like.

Further, although only one clamping force applying means 12 is shown in the figure, a plurality of clamping force applying means 12 are arranged in order to evenly lower the cylinder 4, which is a movable member in the dome 1.

Note that the clamping force applying means 12 includes a piston rod 14 mounted on the base 2 and a cylinder tube 15 mounted on the movable member 4.
The movable member 4 may be pushed up in a rising (lifting) direction.

Reference numeral 26 denotes a support device, which includes a guide rod 28 that projects upward from the piston base portion 27 and is inserted into the flange portion of the cylinder 4, and is wound around the guide rod 28 to elastically hold the cylinder 4 in the initial position. It is made of an elastic material 29, shown as a coil spring, which is supported by a coil spring. Note that a plurality of the support devices 26 and the clamping force applying means 12 are arranged radially in a plan view in order to evenly support the cylinder 4.

In this embodiment, the overhang amount adjusting means 30 includes a female screw 31 formed on the base portion 27, and a male head screw 32 screwed into the female screw 31 to adjust the distance between the overhead surface and the bottom surface of the cylinder. Additionally, one having a lock nut 33 is illustrated. Note that a plurality of male screws 32 of this adjusting means 30 are arranged radially in a plan view so as to be evenly applied to the cylinder 4.

34 is a stopper which, in the final stage of deep drawing, engages and integrates the punch 8 side and the press plate 10 side in the pressing direction to set the deep drawing height and to increase the bunch force pressing capacity. In this embodiment, it is provided on the pressure plate 10, but this is provided on the crosshead 9, etc., and is connected to the drive unit on the punch 8 side and the pressure plate 10. The side drive may be capable of engagement and integration at any point within the mechanism.

Further, in order to adjust the aperture height, an engagement position adjustment mechanism may be provided in the engagement portion.

In addition, when a separate pressure plate is provided in the pressure plate 10 that can obtain the pressing force of the blank material independently of the pressure force of the piston rod 11, the pressure plate and the punch 8 side are engaged and integrated. Alternatively, an engagement mechanism may be provided.

Next, a drawing cycle for the blank material B according to the first specific example will be described with reference to FIGS. 1 to 4.

The initial position (starting position) shown in Figure 1.

In the initial position), the punch 8 and the pressure platen 10 are positioned at a certain distance from the top surface of the die 5 for loading the blank B, the cylinder 4 is in the initial position, and the elastic member 29 of the support device 26 It is held at a balanced height, the surface of the incompressible fluid (pressure medium) is located near the opening 5A, and a blank material B such as a steel plate is placed on the die 5 to close the opening of the fluid pressure chamber 6. It is left behind.

Next, as shown in FIG. 2, the pressure plate 10 is lowered and comes into contact with the blank material B.
Acts as a blocker against In this case, the switch S1 and the switch receiver S2 are brought into contact and closed, and the switching means 22 is switched to the 2nd position.
By switching to the position 2A and applying hydraulic pressure to the lifting port 15B and applying force in the lifting direction to the cylinder 4 via the piston rod 14, the initial movement around the blank material 8 by the pressure plate 10 and the die 5 is A clamping force is applied.

Further, when the pressure plate 10 is lowered through the piston rod 11 of the side cylinder device against the upward force of the means 12, the elastic material 29 of the support device 26 is compressed, and the cylinder 4 is moved downward.

Although the pressure medium in the fluid pressure chamber 6 is compressed as the cylinder 4 descends, the opening of the fluid pressure chamber 6 is closed with the blank material B, and moreover, due to the cooperation between the pressurizing force and the applying means 12, Because of the pinching, there is no place for the pressure medium to escape, and in the end, the blank material B is curved in the opposite direction to the downward direction, that is, upward, due to the pressure medium internal pressure P0, as shown in Fig. 2. molded.

The overhang i1H of the reverse overhang molded part B3 is made until the cylinder 4 comes into contact with the head of the male screw 32.
By adjusting the distance between the head of the cylinder 2 and the cylinder 4 in advance, the overhang amount H is made suitable for the thickness of the blank material B, the intended product, etc.

When the cylinder 4 comes into contact with the head of the male screw 32, the switch S3 provided at the lower end of the cylinder 4 is activated by the head of the male screw 32, the switching means 22 is switched to the position 22C, and the clamping force holding means 12 is switched to the position 22C. The hydraulic pressure of 15B is released, and the force of pushing up the cylinder 4 by the piston rod 14 is eliminated.

Next, as shown in FIG.
When moved toward the fluid pressure chamber 6, the punch 8 is moved toward the forming part B.
3 is pressed down, the molding pressure is pressed into the fluid pressure chamber (chamber) 6 through the opening portion 5^ with a pressurizing force F, and the molding pressure generated here by the pressurizing force F and the pressurizing force F of the pressurizing plate 10. P, the punch 8 acts as a male mold to perform pressing, that is, drawing.

Pressing down the punch 8 and the blank material B into the fluid pressure chamber 6 means attempting to reduce the volume of the acid chamber 6.

However, this volume reduction is caused by the fact that the cylinder 4 is in the fluid pressure chamber 6.
The internal pressure (opposed hydraulic pressure), that is, the molding pressure P, is compensated for by moving the cylinder 4 upward as shown by arrow C as a relative movement.

This means that it is not necessary to discharge the non-recondensable pressure medium from the fluid pressure chamber 6, there is no need to replenish the pressure medium for this purpose, there is no energy loss, and the pressure in the fluid pressure chamber 6 is That is, the molding pressure P is adjusted simply by the area ratio of the punch 8 and the piston 3 and the magnitude of the force exerted by the side cylinder device 11.

Further, by adjusting (controlling) the development of the force of the side cylinder device 11 in relation to the downward movement of the punch 8, the hydrostatic molding pressure within the fluid pressure chamber 6 can be optimized.

When the drawing of the bunch 8 approaches the final stage, in this embodiment the crosshead 9 and the stopper 34 come into contact as shown in FIG. There is no relative movement, and the drawing depth is set, and the margin of drive capacity of the bunch 8 (difference between the allowable capacity of the drive mechanism of the punch 8 and the force actually received by the bunch 8 from the fluid pressure chamber 6) The pressurizing force F of the pressurizing plate 10 is transmitted to the dome 1 side, where molding is performed while ensuring the maximum opposing hydraulic pressure.

When the prescribed molding is completed, the punch 8 is pulled up, the pressure platen 10 is also raised, and the molded product is taken out. At this time, the cylinder 4 descends together with the dice 5 due to their own weight, but when the switching means 22 in the control system 18 switches the switching valve to the position 22B, the application means 12 is switched in the direction of descending, and the cylinder device is reduced in size. , throttle valve 24B
The cylinder 4 is elastically supported by the elastic material 29 in the support device 26 while the descending speed is controlled by etc. will prevent it from leaking and will come to rest in a balanced position.

At this time, the horizontal level of the pressure medium becomes close to the opening portion 5A, and the cylinder 4 does not stop midway and is reliably supported by the support device 26 through elasticity.

It should be noted that it is advantageous to select a pressure medium with a relatively high viscosity value, which facilitates sealing problems. Furthermore, it is advantageous to use a fluid that is as least adhesive to the blank B as possible.

5 to 8 show means 12 capable of both adjusting the amount of extension and applying clamping force according to second to fifth embodiments of the present invention.

In the second to fifth specific examples, since the basic configuration is the same as that of the first specific example described above, common parts are indicated by common symbols, and only the functions of the different parts will be explained below.

In FIG. 5, when the cylinder 4 is in the initial position due to the support device 26 which is the initial position setting, the solenoid 22
has the function shown in the figure, the raising circuit 20 has a proportional solenoid, a relief valve 35 and a check valve 36, and the position of the cylinder 4 is detected by a cylinder position detection sensor 37.
This detection signal is calculated by the comparator 38, and when it reaches the set value of the setting device 39, the proportional electromagnetic relief valve 35
is closed, the movable cylinder 4 is stopped, and the amount of reverse overhang molding is determined. In this reverse stretch forming process, the downward resistance of the movable cylinder 4 is adjusted by the proportional electromagnetic relief valve 35, the clamping force around the blank material 8 by the pressure plate 10 and the die 5 is applied and adjusted, and the gap between the blank and the die is adjusted. It is possible to prevent pressure medium leakage and adjust the wrinkle pressing force. It is also possible to change the clamping force during the reverse stretch molding process.

When the movable cylinder 4 is lowered by its own weight or forcibly after completion of molding, the set pressure of the proportional electromagnetic relief valve 35 is lowered.

In the third specific example shown in FIG. 6, the solenoid 22 in FIG. 5 is replaced by a three-position solenoid 122, and the solenoid 122 is provided with a function 122A for forcibly raising the application means 12 by the pump 4o. This allows the support device 2 for initial position setting in FIG.
6 becomes unnecessary.

That is, in the event that the cylinder 4 is lowered from its initial position after completion of molding, the function 1228 of the solenoid 122 raises it, the position is detected by the position detection sensor 37 of the cylinder 4, and the solenoid 1
22 is switched to the position shown, and the cylinder 4 is stopped. In this case, the proportional electromagnetic relief valve 35 automatically throttles so that the clamping force for the blank material B necessary for the next molding is obtained.

If cylinder 4 is too high up from the initial position,
It is lowered by solenoid 122 as shown.

Similar to the second specific example, in this third specific example, the downward resistance of the movable cylinder 4 is adjusted by the proportional electromagnetic relief valve 35 in the reverse stretch forming process, and the pressure plate 10 and die 5 By applying and adjusting the clamping force, it is possible to prevent pressure medium leakage between the blank and the die and to adjust the wrinkle pressing force.

In FIG. 7, the fourth specific example, like the fifth specific example, eliminates the need for a support device for setting the initial position. 41 and a check valve 42. Thereby, the proportional electromagnetic relief valve in FIG. 6 can be replaced by a manually adjusted relief valve 135. Similar to FIG. 6, this structure also makes it possible to prevent pressure medium from leaking between the blank and the die when the cylinder 4 is lowered, and to adjust the wrinkle pressing force when the cylinder 4 is reversely extended.

In FIG. 8, this fifth specific example replaces the stroke lower limit setting circuit of FIG. 7 with a check valve 43 having a spring 43;
This is replaced with a bushing 44 having a spring 44A and a stroke adjustment screw 45. Naturally, in this case as well, the support device for initial position setting becomes unnecessary.

Similarly to FIG. 7, this structure also makes it possible to prevent leakage of pressure medium from between the blank and the die when the cylinder 4 is lowered, and to adjust the wrinkle pressing force when the cylinder 4 is extended backwards.

The support device 26 shown in FIGS. 5 to 8 has a support rod 128 inserted into the pedestal 27 so as to be movable up and down, and the initial position is adjusted by adjusting a double nut 128A, and a coil spring 129 is used to move the support rod 128 upward. This example shows what was fired.

(Effects of the Invention) The present invention has been described in detail above, and has the following advantages.

A dome forming a fluid pressure chamber containing a pressure medium (fluid) is
It consists of a relatively slidable cylinder and piston, so
During pressure molding using a fluid, there is no need for the pressure medium in the fluid pressure chamber to escape through a throttle valve or the like, and therefore there is no significant energy loss, no malfunction of the pressure medium, and no temperature rise. This eliminates the need for a pump device or pressure adjustment device for supplying and discharging pressure medium for molding, and also eliminates the need to re-supply a large amount of pressure medium, simplifying installation and production. Cycle time can be expected to be improved.

Furthermore, in the present invention, when performing reverse stretch molding on a blank material using opposing hydraulic pressure, there is no need to supply a molding pressure medium from the outside to the fluid pressure chamber, and no equipment for this is required, and the production cycle time is also improved. .

In addition, the present invention makes it easy to adjust the amount of reverse overhang molding, and in addition, in the reverse overhang molding process, a means is provided for applying an initial clamping force to the blank material using a pressure plate and a die. In addition to being able to obtain sufficient pressure for stretch molding, the wrinkle pressing force can also be adjusted, and leakage of pressure medium from between the blank material and the die during the stretch molding process can also be minimized. , it is possible to obtain a highly accurate reverse overhang forming amount, prevent breakage of the blank material or product and extreme reduction in product thickness during drawing with a punch that follows the same process, and achieve high quality drawing with opposing hydraulic pressure. Can be molded.

Since the present invention exhibits the above-mentioned advantages, it is truly significant as a fluid pressure forming processing apparatus.

[Brief explanation of the drawing]

The drawings show specific examples of the present invention, and FIGS.
In specific examples, Fig. 1 is an elevational sectional view at the initial position, Fig. 2 is an elevational sectional view showing the pressurized state by the pressure plate, Fig. 3 is an elevational sectional view showing the molding state, and Fig. 4. is an elevational sectional view showing the final stage of the molding process, and FIGS. 5 to 8 are elevational sectional views showing only the main parts of the second to fifth specific examples. DESCRIPTION OF SYMBOLS 1...Dome, 3...Piston, 4...Cylinder, 5...Dice, 6...Fluid pressure chamber, 8...Punch, 10...Pressure plate, 12...Applying Means, 18...
Control system, 22... switching means.

Claims (1)

[Claims] (1) A dome 1 having a die 5 and a fluid pressure chamber 6 opened on the die 5 side, and a punch 8 disposed facing the dome 1 so as to be able to enter into the fluid pressure chamber 6 from the die 5 side.
A punch 8 is placed facing the dome 1 and is placed on the dome 1 side.
and a pressure plate 10 that can be pressed independently, and a blank material B having a fluid pressure chamber 6 closed on the die 5.
The blank material B is inserted into the fluid pressure chamber 6 of the punch 8 while the periphery of the die 5 is sandwiched between the dome 1 side and the pressure plate 10 side.
The dome 1 consists of a piston 3 and a cylinder 4, and either the piston 3 or the cylinder 4 is fixed or stationary, and the other is relatively movable. The fluid in the fluid pressure chamber 6 is maintained at a predetermined molding pressure without being discharged from the fluid pressure chamber 6, and furthermore, the fluid pressure chamber 6 is kept closed around the die 5 of the blank material B. When the movable member side of either the piston 3 or the cylinder 4 of the dome 1 is lowered by clamping the dome 1 side and the pressure plate 10 in cooperation, a clamping force that applies a clamping force in the opposite direction to the descending direction A fluid pressure forming processing apparatus characterized by comprising a applying means 12.