JPH07223026A - Method and device for pressurizing - Google Patents

Abstract

PURPOSE:To easily execute transfer forming along die shape with small spring back quantity, being applicable to complicated shape at a low cost. CONSTITUTION:A high pressure fluid F is supplied to a flexible body 2 capable of expanding/contracting in a pressurizing unit 1 so as to expand the flexible body 2, a material M to be formed is formed by pressurizing from the inside of the material M to be formed accommodated in a die 10. The flexible body 2 in the pressurizing unit 1 is communicated to an outside fluid pressurizing source through a fluid passage 4 pierced in a base plate 3 placed at the opening face side of the die 10. Also, on the upper surface of peripheral part of the material M to be formed which is positioned at the opening peripheral part of the die 10, the retainer 5 for material to be formed to press/retain the peripheral part is placed at the peripheral part of the rear surface of the base plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a pressurizing action of a high-pressure fluid for press-molding a metal into a predetermined shape and injection-molding plastic. The present invention relates to a pressure processing method and a pressure device for the pressure processing method.

[0002]

2. Description of the Related Art Heretofore, as one of press working techniques, a facing equal pressure molding method has been proposed in which a metal material to be molded is subjected to equal pressure by fluid from all directions. According to this, it is possible to apply high pressure to the entire surface of the metal material for a long time and hold it, and the amount of spring back is smaller than that of the mechanical press working method, which enables precision processing. Have advantages. Moreover, since it is not necessary to manufacture a die for either the punch or the die, it can be used at a relatively low cost. Therefore, the facing equal pressure molding method can be used for molding a small amount of products. There were many.

On the other hand, a cylindrical molding material is put on a multi-divided punch, and the punch is expanded by a wedge-shaped tool to automatically generate a tensile force in the circumferential direction on the material and expand it. There is also proposed an expand molding method in which a mold shape to be transferred is transferred or drawing is performed by a die held on the outer circumference.

[0004]

However, according to the above-mentioned conventional facing equal pressure molding method, since a high-pressure fluid is used, its reliable sealing property cannot be obtained, and pressure is applied during discharge, injection, etc. The working environment is deteriorated such that the working fluid is scattered, and it is difficult to maintain safety.

Further, according to the expand molding method, the process of forming a cylindrical molding die is complicated, and the cost is relatively high in that a multi-divided punch, wedge-shaped tool or the like is used. However, there is a drawback that it is not suitable for molding of complicated shapes.

Therefore, the present invention has been made in view of the existing circumstances as described above, and presses the molding material against the mold by the flexible body that is pressurized and expanded by the high-pressure working fluid. By doing so, it is possible to easily perform the transfer molding along the shape of the mold, the amount of spring back is small, it is possible to deal with complicated shapes, and the pressure processing method and the pressure device therefor can be used at low cost. With the goal.

[0007]

In order to achieve the above object, in the method of the present invention, a flexible body 2 which is expanded and contracted by supplying a high-pressure fluid F to the flexible body 2 which can be expanded and contracted. The material to be molded M housed in the mold 10 is pressed by 2 and molded.

The apparatus of the present invention suitable for carrying out the above-mentioned method of the present invention is such that the molding surface is formed on the inner side surface, and the mold 10 in which the molding material M is housed and the molding material M are It is characterized in that it is provided with a pressurizing unit 1 provided with a flexible body 2 capable of expanding and contracting, which is inserted into a housed mold 10.

The pressurizing unit 1 communicates with a base plate 3 arranged on the opening side of the mold 10 and a fluid supply passage 4 formed in the base plate 3 along the vertical direction to form a base. A flexible body 2 that is provided on the lower surface of the board 3 and that is capable of expansion and contraction, and a molding material retainer 5 that holds the peripheral portion of the molding material M that is located at the peripheral edge of the opening of the mold 10 are configured. You can

[0010]

In the pressing method and the pressing apparatus for the same according to the present invention, the mold 10 accommodates the material M to be molded and is a flexible body which expands when the fluid F is supplied. A predetermined molding surface is transferred to the material M to be pressed by 2.

The pressure unit 1 arranged on the opening surface of the mold 10 positions the flexible body 2 in the material M to be molded in the mold 10, and the bed 3 passes through the fluid supply path 4. It prevents the flexible body 2 from being lifted up by the supplied high-pressure fluid F. Also, at this time, the material to be molded 5 is
The opening peripheral edge of the molding material M located at the peripheral edge of the opening of the mold 10 is pressed together with the peripheral opening edge of the mold 10 to hold the molding material M.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 shown in the drawing is a press for molding a molding material M such as metal and synthetic resin together with a mold 10. The pressurizing unit 1 is a unit, and the molding material M accommodated in a predetermined mold 10 by a fluid F pressure such as hydraulic pressure supplied from a fluid pressurizing source such as a hydraulic actuator (not shown). A flexible body 2 that expands and contracts inside is provided. That is, the pressurizing unit 1 communicates with the base 3 arranged on the opening surface side of the mold 10 and the fluid supply path 4 formed by perforating the base 3 in the vertical direction, and the base 3 is connected. A flexible body 2 which is provided on the lower surface and is capable of expansion and contraction, and a pedestal 3 on which a peripheral edge portion of the material M to be molded located at the peripheral edge portion of the opening of the mold 10 is lowered.
It is provided with a molding material retainer 5 that is held by being sandwiched by the lower surface and the peripheral edge of the opening of the mold 10. Then, the high-pressure fluid F supplied from the fluid pressurizing source in an appropriately pressurized state by a high-pressure pump or the like enters the fluid supply path 4 through the supply connection pipe 6 and enters the flexible body 2. The flexible body 2 itself expands to expand, and conversely, the flexible body 2 contracts by being sucked and discharged.

Further, the flexible body 2 has heat resistance so as not to be destroyed even by the temperature of the material M to be molded, which is maintained at a high temperature to some extent so that it can be molded, and may be formed into a bellows shape in some cases. In some cases, the surface may be coated with a heat resistant material. The flexible body 2 is firmly fixed to the bottom surface of the base 3 by a flange 7 without being separated from the base 3 even when expanded or contracted.

The molding material retainer 5 is, for example, a doughnut-shaped material having heat resistance, and holds the peripheral edge portion of the molding material M at the peripheral edge portion of the opening of the die 10 by the pressing action of the lowered platform 3.

On the other hand, the mold 10 is formed so that it can be divided into, for example, an appropriate number, and the molding material M is formed on the inner surface thereof.
A suitable molding surface is formed so as to form a predetermined pattern surface or the like on the outer surface of the.

In the embodiment shown in FIG. 1, when the pressurized high pressure fluid F is supplied into the flexible body 2,
The flexible body 2 expands in the molding material M housed and distributed in the mold 10, and the expansion presses the molding material M from the inside toward the inner surface of the mold 10. The pressure at the time of expansion and pressurization at this time is arbitrarily adjusted according to the physical properties of the material M to be molded, and the pressurized state is maintained so that the material M to be molded follows the shape of the inner surface of the mold 10. In addition, in order to prevent the pressurizing unit 1 itself from rising due to the expansion of the flexible body 2, the pressurizing unit 1 is held in an airtight state by a hydraulic actuator or the like. It should be noted that the material M to be molded provided in the mold 10 has a lump shape or is molded in a substantially tubular shape in advance, and is pressed against the inner surface of the mold 10 by the expansion of the flexible body 2. .

When the molding of the material M to be molded is completed by the pressure expansion of the flexible body 2, the fluid F is discharged from the inside of the flexible body 2 to release the pressure on the flexible body 2 and to contract it. The pressure unit 1 is separated from the mold 10 and the molded material M is taken out.

FIG. 2 shows another mode of the mold 10, in which the diameter of the opening is smaller than the inner diameter, and the fluid F is not supplied and is constricted. The flexible body 2 in this state is placed in the mold 10 and then expanded to press the molding target material M along the inner surface of the mold 10.

Next, the molding procedure using the pressurizing unit 1 will be described. For example, after the material M formed into a substantially cylindrical shape is housed in the die 10 in the close-fitting state located below, the metal mold The pressure unit 1 is lowered from above the mold 10. At this time, the flexible body 2 of the pressurizing unit 1 is left deflated without supplying the fluid F and is inserted into the material M to be molded. Then, the high-pressure fluid F from the fluid pressurizing source is supplied into the flexible body 2 through the supply connection pipe 6 and the fluid supply path 4, and the flexible body 2 is expanded, whereby the material M to be molded is formed. Is pressed against the inner surface of the mold 10 to maintain the pressed state. When the molding surface of the inner surface of the mold 10 is transferred to the material M to be molded and the molding is completed, the fluid F in the flexible body 2
Of the molding material M after the flexible material 2 is contracted and constricted by discharging
While pulling up the flexible body 2 from inside, the mold 10 is divided,
The material M is taken out by disassembling.

[0020]

The present invention is configured as described above,
Therefore, by pressing the molding material M against the mold 10 by the flexible body 2 that is pressurized and expanded by the high-pressure working fluid F, transfer molding along the shape of the mold 10 can be easily performed. Is. Further, when the expanded flexible body 2 is press-molded, the amount of spring back is reduced by maintaining the pressurizing state, so that the surface to be molded of the material M to be molded can be more closely attached to the molding surface of the mold 10. As a result, transfer reproducibility is improved and a complicated shape can be handled. Moreover, unlike the prior art, since it is not necessary to adopt a complicated structure and shape such as expansion of a punch by an expand molding method or the like, it can be inexpensively used.

Since the fluid F is pressed by the high-pressure fluid F, the fluid F is uniformly expanded in all directions in the flexible body 2. Therefore, almost uniform transfer formation by the molding surface of the die 10 is performed. to enable. In addition, in supplying the fluid F to the flexible body 2 in the pressurizing unit 1, since a high pressure is applied for a long time, the springback amount can be suppressed and high reproducibility can be obtained. .

Furthermore, since it is sufficient to prepare only the mold 10 into which the flexible body 2 is inserted, instead of the conventional male and female mold form, the cost for manufacturing the mold can be reduced. As a result, it is possible to provide molded products at low cost.

In particular, since the flexible body 2 inserted into the mold 10 expands and contracts, it can be used for molding a hollow product having a small opening diameter and a wide interior such as a helmet shape. This is preferable and does not require the conventional die division, indexing, demolding movement direction and other complicated structures, procedures, controls and the like.

Further, even if the high-pressure fluid F is used, since it is sealed in the flexible body 2, it is reliably sealed and the pressurized working fluid F may scatter. There is no doubt that it is safe to work with. Moreover, in the case of the molding method by expanding the punch of the expand molding method, compared with the punch itself having restrictions on molding, the present invention does not have such restrictions at all, and like the bulge molding method. Also, there is no need to insert rubber or liquid before molding, and there is no need for cleaning and discharging, which is very useful for labor saving.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the device of the present invention.

FIG. 2 is a perspective view of another embodiment of the device of the present invention.

[Explanation of symbols]

 F Fluid M Molding material 1 Pressurizing unit 2 Flexible body 3 Platform 4 Fluid supply path 5 Molding material retainer 6 Supply connection pipe 7 Flange 10 Mold

Claims (3)

[Claims] 1. A high-pressure fluid is supplied to a flexible body capable of expansion and contraction, and the material to be molded contained in a mold is pressed and molded by the expanded flexible body. And pressure processing method. 2. A mold having a molding surface formed on an inner surface thereof, the mold containing a molding material, and a flexible mold capable of being expanded and contracted inserted into the mold containing the molding material. A pressurizing device having a body and a pressurizing unit. 3. The pressurizing unit is mounted on the lower surface of the base plate, in communication with the base plate arranged on the mold opening surface side and the fluid supply passage formed by opening the base plate in the vertical direction. The pressurizing device according to claim 2, further comprising a flexible body capable of expanding and contracting, and a molding material retainer for holding a peripheral edge portion of the molding material located at a peripheral edge portion of the mold opening.