JPH01133622A - Method for pressing three dimensional curved surface of extra thick plate - Google Patents

Abstract

PURPOSE:To form many kinds of three dimensional curved surfaces by fitting press plates to form a desired three dimensional curved surface on each pressure surface side of an upper and a lower part press using a dummy plate and pressing a stock to be worked between these press plates. CONSTITUTION:A plurality of movable fulcrum rods are arranged on an upper and a lower part press 32, 33, the height (h) of each movable fulcrum rod is adjusted and projected according to the three dimensional curved surface formed on the stock 20 to be worked and supporting side plates 12 are provided on the external circumferences. A dummy plate 21 made of mild steel, where press plates 16 are welded to both upper and lower surfaces at a plurality of places, is placed between the upper and lower part presses 32, 33 in a heated state to form the press plate 16 by pressing to the desired three dimensional curved surfaces. Then, after the press plate 16 is welded and fixed by welds 19 to the supporting side plates 12, the dummy plate 21 is separated and removed. In this way, the heated stock 20 is located between the press plates 16 fixed to the upper and lower part presses 32, 33 through each movable fulcrum rod to be pressed. Hereby, it is possible to obtain a general-purpose forming device to easily obtain desired various three dimensional curved surfaces at high precision.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a method for press forming an extremely thick plate into a three-dimensional curved surface, for example, for press forming an extremely thick plate such as a large water turbine vane.

[Conventional technology]

Figure 14 shows the mold shape in the case of the conventional three-dimensional curved surface molding method.
This will be explained with reference to FIG. FIGS. 14 and 15 are explanatory diagrams in which a male mold, a molded product, and a female mold of an integral linear mold and a lattice structure mold are arranged in the order of joining, respectively. In the figure, 2G
2 is a male mold, 27 is a female mold, 28 is a molded product, 29 is a side plate, 3
0.31 is the rib, and 37 is the impression caused by the rib. 1st
Figure 4 shows an integrated linear mold in which the three-dimensional curved surfaces required for the male mold 26 and female mold 27 are formed on the press molding surface, and Figure 15 shows a vertical lattice (ribs 30, 31
) is a lattice structure linear type that obtains an approximate three-dimensional curved surface by combining the three-dimensional curved surface, and is generally used. Proposed. Japanese Patent Application Publication No. 5
According to Japanese Patent No. 9-163033, an integral linear mold is manufactured by filling the space of a structural structure with a filler that solidifies after a certain period of time, and a press is combined to form a workpiece into a three-dimensional curved surface.

In addition, the one according to Japanese Patent Application Laid-Open No. 60-174222,
This machine performs bending using multi-point support, and a support rod with multiple lifting and lowering functions is installed as part of the upper and lower pressure tables as part of the press machine, and a spherical bearing type support head attached to the tip of the support rod The workpiece is pressurized and bending is performed by configuring a minimum of three or more bending fulcrum points.

In the case of the above-mentioned integral type or lattice structure linear type, (a) manual finishing by NC processing or gauge matching is required to form a complex three-dimensional curved surface, so it is suitable for hot processing of thick plates. In the case of large-sized processed products, many man-hours are required, which poses an economical problem. (b) If the molded curved surface needs to be corrected or reprocessing is required due to deterioration of accuracy due to deformation, etc., a large number of processing steps are required as in (b), which poses a problem in terms of economic efficiency in terms of maintenance. . (c) Also,
A pair of molds is required for each molded curved surface, and when manufacturing multiple press-molded structures each having a different three-dimensional curved surface, it is necessary to manufacture a linear mold according to each curved surface. There was a point.

(d) On the other hand, when a thick steel plate is hot-worked continuously, there is generally a problem that the mold becomes high in temperature, causing thermal deformation and deterioration of accuracy. (e) When the temperature of the mold becomes high due to continuous hot working, the cooling rate of the hot worked material after forming decreases, and the time until pressure is released becomes longer.
Depending on the grade, such as alloy steel, the cooling rate in the austenite region is slow, resulting in coarsening of crystal grains and the need for reheat treatment after completion of forming.

Furthermore, in the case of JP-A-60-174222 "Press with universal mold", (f) the support rod is directly subjected to bending pressure, so there is a problem that the pressing force is limited by the fixation of the rod and the withstand pressure. For this reason, it is difficult to manufacture an apparatus applicable to hot forming of thick steel plates, which requires a large pressing force.

(G) Furthermore, the head at the tip of the support rod partially contacts and pressurizes the workpiece, and in hot working of a thick plate, depending on the arrangement and dimensions of the support rod, there may be an indentation. (H) Furthermore, a dedicated press is required, which poses an economical problem.

[Problem that the invention seeks to solve]

In the above conventional technology, when the pressurizing device of a general-purpose press machine cannot be used, or when press-molding individual molded products with different three-dimensional curved surfaces, molds are manufactured according to each curved surface. This requires a large number of man-hours to manufacture and maintain, and the press-formed product support rods may cause indentations.

Alternatively, when a three-dimensional curved surface is supported and pressurized using a support rod, the pressure force is structurally limited, and it can be installed on a general-purpose press pressurizing device. It is very easy to form a press plate of
The heated workpiece material is press-formed by the surface of the seized press die, which is kept at a low temperature, and thick plates can be economically press-formed into three-dimensional curved surfaces with high precision and high durability. No consideration was given to the special press equipment,
This method requires a large number of man-hours for mold production, maintenance and inspection, and is not economically viable.

The present invention was made in view of the above situation, and it is an object of the present invention to form a press mold that can be attached to a pressurizing device of a general-purpose press and that can mold various types of three-dimensional curved surfaces on a case-by-case basis. This is a thick three-dimensional curved surface press that is extremely simple and easy, and the mold has high precision and high durability, and can be economically formed into a three-dimensional curved surface by reducing the pressing force of the movable fulcrum rod by hot working. The purpose is to provide a molding method.

[Means for solving problems]

The above purpose is to provide a method in which a thick plate of a heated workpiece material is sandwiched between upper and lower presses and press-formed into a three-dimensional curved surface. a press plate forming a pressing surface of the press, and a press plate contacting the press plate surface via a pressure receiving head so as to be able to suppress the curved surface, and protruding height dimensions corresponding to respective positions of the curved surface shape are formed so as to be adjustable and controllable. , and a plurality of movable support rods formed to be cooled via a flowing refrigerant at the mounting position, and a position surrounding the entire movable support rod or a position where the movable support rod is divided into a plurality of pieces. a support side plate provided with a maximum protrusion that is disposed on the movable fulcrum rod and is cooled together with the movable fulcrum rod, and that corresponds to the shape of the suppressed deformation portion of the workpiece during pressing and mainly pressurizes and deforms the workpiece. The protruding height of each of the movable fulcrum rod and the supporting side plate, which are formed with a press molding and which are attached to the upper and lower presses, is adjusted and controlled according to the desired three-dimensional curved shape of the workpiece to be press-formed. The pressure receiving head and the support side plate of the movable fulcrum rod, which are arranged facing each other, are sandwiched and pressed with the press plate fixed to each of the upper and lower surfaces and a heated dummy plate. After forming the three-dimensional curved surface on the dummy plate joining surface of the pressing plate, the pressing plate is fixed to the supporting side plate whose protrusion height is adjusted while the dummy plate is pressed, and the pressure receiving head is is brought into contact with the press plate, the dummy plate is separated and removed, and the heated workpiece is sandwiched between the press plates while maintaining the press plate, the movable fulcrum rod, and the supporting side plate at a low temperature, and then pressed. This is achieved by processing thick plate three-dimensional curved surface press forming method.

[Effect]

As described in the description of the embodiment below, the seventh
Each of the upper and lower presses 32 and 33 shown in the figure is provided with a plurality of protruding movable fulcrum rods 1 whose heights are adjusted according to the three-dimensional curved surface formed on the workpiece 20. A support side plate 12 is set surrounding the movable fulcrum rod 1 and formed to have a predetermined protruding height. Then, as shown in FIG. 6, a dummy plate 21 made of a mild steel layer having push plates 16° 16 fixed at a plurality of locations on both upper and lower surfaces by welding parts 22 is placed in the upper and lower press 3 in a heated state.
It is attached at a position sandwiched between 2 and 33 as shown in FIG. 7, and is pressed as shown in FIG. In this case,
Push plate 16. Each of the movable fulcrum rods 1 is formed to be coolable, and this dummy plate 21. The press plate 16 is not cooled during press working. Through this press working, the surface of the press plate 16 that forms the peripheral part of the workpiece 20 is formed by the support side plate 12 so as to form the required three-dimensional curved surface, and the protrusion amount of each is adjusted to the calculated size. With the movable fulcrum rod 1 adjusted as shown in FIG.
6 is formed into a desired three-dimensional curved surface. This push plate 16.1
Immediately after 6 is formed into a three-dimensional curved surface, the push plate 16 is welded and fixed to the support side plate 12 via the welded portion 19, and then the dummy pump is assembled.

The plate 21 fuses the welded portion 22 to separate it from the push plate 16 and remove it.

Therefore, the attachment position of the press plate 16 to the supporting side plate 12 is the position where the press plate 16 is pressed together with the dummy plate 21, and the press plate 16 of the pressure receiving head 2 fixed to each movable fulcrum rod 1 Similarly, the contact position is the same as when the dummy plate 2'1 and the press plate 16 are pressed. Then, as shown in FIG. 11, the heated workpiece 2o is positioned between the upper and lower press plates 16 and 16, and press-formed as shown in FIGS. 1 and 2. In this case, the push plate 16. Movable fulcrum rod 1. The support side plate 12 is maintained in a cooled state, and the workpiece 20 can be processed and formed smoothly and with accurate dimensions. Then, for each press forming of each workpiece 20 whose three-dimensional curved surface changes, the protrusion height of the support side plate 12 and the protrusion height of each movable support rod 1 according to the calculated dimensions are adjusted using the dummy plate 21. After the press plate 16 is formed into a desired three-dimensionally curved press-formed surface, the workpiece 20 is press-formed by the method described above.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the thick plate three-dimensional curved surface press-forming method of the present invention will be explained using an example with reference to FIGS. 1 to 8.

FIG. 1 is an explanatory diagram of a molding apparatus for carrying out the method, FIG. 2 is a leakage cross-sectional view of FIG. 1 excluding the upper press, and FIG. 3 is a perspective view showing the connection relationship of the mold conceptual parts of FIG. 1. Figure 4 is a perspective view of the lower part of the press in Figure 1, Figure 5 is an explanatory diagram of the assembly of the support side plate for the jack frame part in Figure 4, and Figure 6 is the material assembly of the dummy plate and the push plate in Figure 1. Perspective view showing the state, No. 7
8 are longitudinal cross-sectional views of the dummy plate shown in FIG. 6 before and after pressure molding using the molding apparatus shown in FIG. 1, respectively. In the figure, 1 is a movable fulcrum rod, 2 is a pressure receiving head of the movable fulcrum rod 1, 3 is a male thread of the fulcrum rod, 4 is a lock ring, 5 is a jack outer cylinder, and 6 is a movable fulcrum part.

7 is the epithelial plate, 8 is the hypodermal plate.

9 is an outer frame, 10 is a side plate receiving plate, 11 is a jack frame portion, and 12 is a support side plate that bears most of the pressure that deforms the workpiece 2o when press-forming the workpiece 20. There is. 13 is a bolt, 14 is a cooling medium supply/discharge pipe, 1
5 is a supporting side plate part, 16 is a push plate, 17 is a water pipe, 18 is a water passage hole, 19 is a welding part, and 21 is a dummy plate;
2 is a welding part, 23 is a lower press table, 24 is an upper press table, 32 is an upper press, and 33 is a lower press.

The molding device is roughly composed of a movable fulcrum section 6, a jack frame section 11, a support side plate section 15, and a push plate 16. The movable fulcrum part 6 receives the load of the movable fulcrum rod 1 and the pressure-receiving head 2 in contact with the push plate 16, and a fulcrum rod male thread 3 with sufficient load-bearing capacity is provided on the outer periphery of the movable fulcrum rod 1. . The height of the pressure receiving head 2 can be freely adjusted by rotating the movable fulcrum rod 1 through screw connection with the jack outer cylinder 5. After the center height has been calculated and set, it is fixed with a lock ring 4. The movable and load-bearing mechanism can also be implemented using a hydraulic cylinder in addition to the above-mentioned screw jack system.

The jacking frame portion 11 has an outer frame 9. Side plate receiving plate 10, epithelial plate 7. The vertical pressure P' that is composed of the lower support plate 8 and acts on the jack outer cylinder 5, and the side pressure P that is generated due to the slope support.
It has a strong structure capable of withstanding the rotational moment acting on the jack outer cylinder 5 caused by the side pressure P# and the side pressure P#, and supports each movable fulcrum. Support side plate part 15
12. is a support side plate 12. which forms a cross-sectional portion including the maximum protrusion portion of the mold curved surface and a peripheral portion of the workpiece 20. Tightening bolt 13. Coolant supply and discharge pipe 1 for cooling medium supply and discharge connection pipe
It consists of 4. Adjacent portions of the plurality of support side plates 12 are joined by welding, and are further positioned and fixed to the outer frame 9 of the jack frame portion 11 by tightening bolts 13. The movable fulcrum portion 6 includes a push plate 16. A cooling medium A is supplied and discharged from a space surrounded by the support side plate part 15 and the jack frame part 11 through a cooling medium supply/discharge pipe 14 to cool the space and prevent the influence of heat during hot working.

After the push plate 16 is formed into a required three-dimensional curved surface by a method described later, it is fixedly connected to the support side plate 12 by a welding portion 19 to form a mold for forming a two-dimensional curved surface. The push plate 16 is provided with water holes 18 as required, and the water cooling prevents thermal deformation of the press plate 16 surface during hot processing and the workpiece 20.
The cooling rate is controlled. 3 to 5 show the main components of the molding device.
6 are shown as hollow molded parts such as middle shells, which are combined and connected by welding or the like. FIG. 4 shows the jack frame part 11 in which the push plate 16 is held by movable fulcrum rods 1, and the push plate 16 is supported from the inside by a plurality of movable fulcrum rods 1, so that the withstand pressure is shared. . 5 shows the assembled state of the jack frame 11 before the support side plate 12 is fixed to the push plate 16 and attached to the outer frame 9, and the support side plate 12 is attached to the bolt 13 and the jack frame outer frame as shown in FIG. It is fixed to the jack frame part 11 through a screw hole 13a provided in the jack frame part 9.

The support side plate 12, which is protruded at a predetermined height to form the required three-dimensional curved surface, is connected to the jack frame part 11, and the required height is calculated for each movable fulcrum. Each movable fulcrum part 6 set in
A necessary three-dimensional curved surface that becomes the pressing surface of No. 6 is formed. In the upper press 32, similarly to the lower press 33,
The support side plate 12 and each movable fulcrum rod 1 are formed into the required three-dimensional curved surface. The height of each movable fulcrum part 6 is determined by setting the spherical center position of the spherical radius r of the pressure receiving head 2 according to the calculated dimension, since the necessary curved surface that the pressure receiving head 2 contacts is not constant. Secured. The structure of the pressure receiving head 2 is a hemispherical structure shown in FIG.
There is a known spherical joint type structure shown in Fig. 1. In both cases, the calculated dimensions are set at the spherical center position that touches the required curved surface height with radius r. Moreover, although the structure of the pressure receiving head 2 has been described in the case where the contact portion is a spherical surface, it is preferable that the pressure receiving head 2 has a curved shape suitable for pressing the press plate 16 corresponding to a three-dimensional curved surface.

Next, the order (method) of forming the push plate 16 into a required three-dimensional curved surface will be explained using FIGS. 6 to 8. First, as shown in FIG.
6 to both sides of the dummy plate 16°16 at the temporary welding part 2.
Fix by 2. The thickness of the dummy plate 16 is preferably approximately the same as that of the workpiece 20. The water passage hole 18 provided in the push plate 16 is formed to have a hole diameter of 1/2 or less of the thickness of the push plate 16, and overlaps with the movable fulcrum contact T that contacts the pressure receiving head 2. Since the hole diameter of the water passage hole 18 is 1/2 or less of the plate thickness, the dummy plate 21 will not be crushed when it is clamped. Then, the press plate 16 and the dummy plate 21 in the state shown in FIG. 16 are heated to red-hot temperatures of 1000° C. or higher in a heating furnace to make them sufficiently soft.

As shown in FIG. 7, the support side plate 12 has a pair of upper and lower three-dimensionally curved contact points. Pressure molding is performed using a molding device consisting of a jack frame portion 11 having a movable fulcrum portion 6. In this case, the push plate 16. The movable fulcrum rod 1 and the support side plate 12 are not cooled. The reason for this is that when cooled, the deformation of the press plate 16 is restricted, making it impossible for the supporting side plates 12 and the movable fulcrum rod 1 to form a desired three-dimensional curved surface obediently and accurately.

FIG. 8 shows a state in which pressure forming has been completed.
2 to form a molding die shown in FIG. The connecting portion 22 that joined the press plate 16 and the dummy plate 21 breaks due to the difference in phase deformation during pressure molding, but
If it does not break, the welded portion 22 is removed by a method such as fusing, and the dummy plate 21 that has been formed is removed. Then, the push plate 16 and the support side plate 12 are joined and fixed by the welded portion 19, and the hollow portion is formed by the push plate 16. With the supporting side plates 12 and the jack frame portion 11 now formed, a pair of three-dimensional curved surface molding devices including upper and lower press dies 32 and 33 are completed. - On the other hand, the dummy plate 21 can be used to confirm molding accuracy at a later date.

Next, after the dummy plate 21 is removed, the push plate 16,
The molding process using the 16-piece molding process will be explained with reference to FIG. 11. After confirming the molding accuracy of the pre-formed dummy plate 2, or based on the results of test work, the curved surface accuracy of the push plate 16 is corrected by adjusting the movable fulcrum portion 6. A cooling medium A is supplied to the hollow part in which the movable fulcrum part 6 is built, and a cooling water W is supplied to the inside of the push plate 16 for cooling. After such preparations have been made, the upper presses 32. A workpiece 20, which has been heated in advance to a required temperature, is set as shown in the figure by a pair of three-dimensional forming devices comprising a lower press 33. Then, molding is performed by applying a molding pressure P, and the pressurized state is continued until a certain temperature is reached, and after being cooled by the cooling effect of the surface of the press plate 16, the molding process is completed.

In this embodiment, the forming load of the fulcrum part is shared and supported by a combination of a plurality of movable fulcrum rods 1 and supporting side plates 12, and the formed workpiece 20 is placed in the saddle as shown in FIG. Because of the shape, the maximum load part becomes the supporting side plate 12°12 part facing each other and supports the forming load of these fulcrum parts, and most of the load during forming is borne by the supporting side plate 12. The movable fulcrum part 6
In order to improve accuracy in the final stage of molding, the final molding load is shared. For this reason, the support side plate 12 needs to be placed at the position of the cross section that includes the largest protrusion on the surface of the push plate 16.

FIG. 12(A) is a perspective view of the workpiece 20 formed into the saddle-shaped curved surface explained in FIGS. 1 to 11, and FIG. It is an explanatory diagram showing correspondence. In the shape shown in (b), since the maximum protrusions are located on the outer periphery of both the upper and lower mold pressing surfaces, the supporting side plates 12 attached corresponding to the largest protrusions are arranged to form an outer frame. Figure 13 (a) is a perspective view of the workpiece after being formed into a spherical curved surface in another embodiment, and (b) is a support side plate of the upper and lower presses for forming (a) arranged at the maximum load area. FIG. In the shape shown in (B), the upper mold has supporting side plates 12 corresponding to the maximum pressing force arranged on orthogonal intersecting lines passing through the center of the maximum protrusion, and the lower mold has supporting side plates 12 on the outer frame part. is located. In the formation of a three-dimensional curved surface by the supporting side plate 12 and the plurality of movable fulcrum rods 1, the main body that is pressurized and deformed is the supporting side plate 12,
The movable fulcrum rod 1 suppresses and deforms the portions that contact the respective push plates 16, and therefore, the portions of the support side plates 12 that do not come in contact are finished by the movable fulcrum rods 1, respectively.

As mentioned above, in this embodiment, first, the dummy plate 2
Upper and lower press 3 having the required three-dimensional curved surface using 1
The three-dimensional curved surface of the push plate 16° 16, which becomes the processing surface of 2.33, is formed by a plurality of movable fulcrum rods 1 that press down and form respective parts of the curved surface, and a workpiece 20 surrounding this group of movable fulcrum rods. It is formed by a support side plate 12 that compresses the peripheral portion of the support side plate 12.

Then, press these press plates 16, 16 into upper and lower presses 32°33
It is attached to the upper and lower presses so that the pressing surface becomes the pressing surface, and the workpiece 20 is press-worked into a molded product having a desired three-dimensional curved surface. That is, a conventional rod-shaped mold has a plurality of movable fulcrum parts 6 and a pair of upper and lower supporting side plates 12, respectively.
and a push plate 16, and the movable fulcrum part 6
can be shared at all times, and the support 1 side plate 12 and press plate 16 can be manufactured according to the three-dimensional curved surface.Therefore, each time a molded product with the required three-dimensional curved surface is pressed,
After creating the press plate 16 having the three-dimensional curved surface, a press molded product is manufactured using this press plate 16. Therefore, there is no need to shrink the mold as in the past, and there is no need for a large number of man-hours. In addition, it is extremely easy to improve the precision of the press-molded curved surface, and it has high durability. Movable fulcrum part 6. A forming device consisting of a support side plate 15 and a press plate 16 is attached, and a press-type suppression mechanism can be used, and the press plate 16 can also control the cooling rate of the workpiece 2o.

Next, the results of experimentally implementing the method of this example will be described below. After forming a desired three-dimensional curved surface on the press plate 16 using the dummy plate 21 as described above, the press plate 16
The thickness of the extra-thick plate is 80mm, and the length and width are 1.5MX1.
．． When forming a 5M 13Cr stainless steel plate into a nearly saddle-shaped three-dimensional curved surface, the outer frame is formed using a support plate 12 made of mild steel with a plate thickness of 50 nin as shown in FIG.
A load of 1,200 tons was applied to the heated workpiece 20, and 16 movable fulcrum rods 1 and supporting side plates 12 supported it and formed it. As a result of actual measurements, the load per point of the movable fulcrum part 6 is a maximum of 20 tons, and the supporting side plate 1
Molding was possible with a small load burden of 30% or less compared to when molding was performed using only a plurality of movable fulcrum rods without using 2. In addition, the forming accuracy for the required curved surface in this embodiment includes the reproducibility accuracy when forming the press plate 16, press-forming the workpiece 20 with this press plate 16, and using this press plate 16 again at the rear end. , ±2.0I or less.

As described above, in the three-dimensional curved surface press molding method of an extremely thick plate according to the present embodiment, first, a press plate is created by press molding so that a desired three-dimensional curved surface is formed on the workpiece. The push plate is produced by press-forming a heated dummy plate held between the support side plates and a plurality of movable fulcrum rods. Next, the dummy plate is removed, and the workpiece is sandwiched between press plates fixed to the supporting side plates and press-formed.

Therefore, when obtaining a press-molded product with a desired three-dimensional curved surface, a press plate is manufactured for each molded product with a different three-dimensional curved surface. A vertical press with a movable fulcrum rod can be attached to a general-purpose pressurizing mechanism. and,
It is extremely easy to form press molds that can accommodate various types of three-dimensional curved surfaces on a case-by-case basis, and the molds have high precision and high durability. This makes it possible to improve economic efficiency and reduce the pressing force on the movable fulcrum rod.

〔Effect of the invention〕

As described above, according to the method for press forming an extremely thick plate with a three-dimensional curved surface according to the present invention, the press mold surface can be attached to a pressurizing device of a general-purpose press and can be formed to correspond to a wide variety of three-dimensional curved surfaces. It is extremely simple and easy to form a mold each time, and the mold has high precision and high durability, and it is possible to economically hot-process an extremely thick plate into a three-dimensional curved surface by using the pressurizing force of the movable fulcrum rod. This has the effect of reducing and molding.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a forming apparatus for carrying out the thick plate three-dimensional curved surface press forming method of the present invention, Fig. 2 is a longitudinal cross-sectional view excluding the upper press of Fig. 1, and Fig. 3 is the mold of Fig. 1. A perspective view showing the connection relationship of conceptual parts; FIG. 4 is a perspective view of the lower press in FIG. 1;
Fig. 5 is an explanatory diagram of the assembly of the supporting side plate for the jack frame part of Fig. 4, Fig. 6 is a perspective view of the assembled state of the materials of the dummy plate and the push plate of Fig. 1, and Figs. 7 and 8 respectively. The dummy plate shown in Fig. 6 was formed using the molding device shown in Fig. 1), and the vertical cross-sectional views before and after the pressure forming were performed. Figs. Explanatory drawings, Fig. 11 (a) is an explanatory view of the workpiece immediately before being formed by the forming apparatus of Fig. 1, (b) is a cross-sectional view of the workpiece formed by (a), and Fig. 12 (i) ) is a perspective view of the molded product molded by the apparatus shown in Figure 1, (B) is an explanatory diagram of the supporting side plates of the upper and lower molds for molding the molded product in (A), and Figure 13 (A) is the molded product shown in Figure 1. A perspective view of a molded product of another embodiment molded by the apparatus, (B) is an explanatory diagram of the supporting side plates of the upper and lower molds for molding the molded product of (B), and FIGS. The male mold, the molded product, and the lattice structure mold respectively.
It is an explanatory diagram in which female molds are arranged in order of bonding. 1. Movable fulcrum rod, 2... Pressure receiving head, 12
...Supporting side plate, 16...Press plate, 20...Work material, 21...Dummy plate, 32...Upper press,
33...lower part No. 1/4--Press board No. Z7 Obai 3 Inryo 4 Ou No. 5 Lo $12 c) Me 140 Me IS

Claims (1)

[Claims] 1. In a method of press-forming a heated thick plate of workpiece material between upper and lower presses into a three-dimensional curved surface, the upper and lower presses are cooled by a coolant flowing inside them, and press the curved surface. A press plate forming a pressurizing surface, and a height dimension of the press plate that contacts the press plate surface through a pressure receiving head so as to be able to press-form the curved surface and protrude corresponding to each position of the curved surface shape can be adjusted and controlled; , a plurality of movable fulcrum rods formed to be cooled via a flowing refrigerant at the mounting position, and arranged at a position surrounding the entire movable fulcrum rod or at a position where the movable fulcrum rod is divided into a plurality of pieces. a support side plate provided with a maximum protrusion that is cooled together with the movable fulcrum rod and that corresponds to the shape of the pressed deformation portion of the workpiece during pressing and mainly pressurizes and deforms the workpiece. The protruding height of the movable fulcrum rod and the supporting side plate attached to the upper and lower presses are adjusted and controlled according to the desired three-dimensional curved shape of the workpiece to be press-formed, and The pressing plate is fixed to the upper and lower surfaces of the pressure receiving head and the supporting side plate of the movable fulcrum rod, and a heated dummy plate is sandwiched and pressed. After forming the three-dimensional curved surface on the dummy plate joint surface of the plate, the pressing plate is fixed to the supporting side plate whose protrusion height is adjusted while the dummy plate is pressed, and the pressure receiving head is pressed. Separating and removing the dummy plate in contact with the plate, and sandwiching the heated workpiece between the press plates while maintaining the press plate, the movable fulcrum rod, and the support side plate at a low temperature, and press-working the heated workpiece. A method for press forming extremely thick plates with three-dimensional curved surfaces.