JPH0722791B2 - Extra thick plate 3D curved surface press forming method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a three-dimensional curved surface press forming method of an extremely thick plate for pressing an extremely thick plate such as a large turbine vane.

[Conventional technology]

Figure 14 shows the mold shape in the case of the conventional three-dimensional curved surface molding method.
It will be described with reference to FIG. FIG. 14 and FIG. 15 are explanatory views in which an integral general-purpose mold, a male mold of a lattice structure mold, a molded product, and a female mold are arranged in the order of connection. In these figures, 26 is a male mold, 27 is a female mold, 28 is a molded product, 29 is a side plate, 30, 31 are ribs, and 37 is an imprint by the ribs.

FIG. 14 shows an integrally formed mold in which the three-dimensional curved surfaces themselves required for the male mold 26 and the female mold 27 are formed on the press molding surface.

FIG. 15 shows a general type of lattice structure in which vertical lattices (ribs 30 and 31) are combined to obtain an approximate three-dimensional curved surface, which is generally used.

In addition, Japanese Patent Application Laid-Open No. 59-16 has
3033 and JP-A-60-174222 have been proposed.

Japanese Unexamined Patent Publication No. 59-163033 is for manufacturing an integrally formed mold by filling a space of a structure structure with a filler that solidifies after a certain time elapses, and combines a press to form a workpiece into a three-dimensional curved surface. is doing.

Further, the one disclosed in Japanese Patent Laid-Open No. 174222/1985 performs bending by multi-point support, and as a part of a press machine, a supporting rod having a plurality of lifting functions is provided in a part of upper and lower pressure tables. The spherical bearing type support head attached to the tip of the support rod pressurizes the material to be processed to form a minimum of three bending fulcrums to form a bend.

[Problems to be solved by the invention]

In the case of the integral type or the lattice structure type in the above-mentioned conventional technology, (a) NC machining or hand finishing by gauge matching is required to form a complicated three-dimensional curved surface. In the case of a large-sized processed product for hot working, a lot of man-hours are required and there is a problem in economic efficiency. (B) If the molding curved surface needs to be corrected or re-machining due to a decrease in accuracy due to deformation, etc., a large number of processing man-hours are required as in (a), and there is a problem in terms of maintenance economy. It was
(C) Also, a pair of molds is required for each molding curved surface, and when manufacturing a plurality of press-molded structural products having different three-dimensional curved surfaces, manufacturing of a mold for each curved surface There was a problem that was required.

(D) On the other hand, when the hot working of the thick steel plate is continuously performed, there is generally a problem that the temperature of the mold becomes high and the mold is thermally deformed to lower the accuracy. (E) Then, when the temperature of the mold is increased by continuous hot working, the cooling rate of the hot worked material after molding is reduced, and the time until pressure release is prolonged,
Depending on the grade of alloy steel or the like, the cooling rate in the austenite region becomes slow, and as a result, the crystal grains become coarse and re-heat treatment is required after the completion of forming.

Further, in the case of "press with universal die" in JP-A-60-174222, (f) the support rod is directly subjected to the bending pressure, so that there is a problem that the pressure is limited by the fixing of the rod and the pressure resistance. is there. For this reason, it is difficult to manufacture a device applicable to hot forming of thick steel plate that requires a large pressing force. (G) Further, the head at the tip of the supporting rod makes a partial contact with the material to be processed and pressurizes, and there is a problem that indentation may occur depending on the arrangement and size of the supporting rod in hot working of the thick plate. (H) Furthermore, a dedicated press is required, which is problematic in terms of economy.

As described above, these conventional techniques cannot use the pressurizing device of a general-purpose press device. Further, when press-molding individual molded products having different three-dimensional curved surfaces, a mold corresponding to each curved surface is manufactured, which requires a large number of man-hours for manufacturing and maintenance. Further, indentation is caused by the support rod of the press-formed product, or the pressure is structurally limited when the three-dimensional curved surface is supported and pressed by the support rod.

As described above, there are problems that a dedicated press device is required, a large number of man-hours are required for manufacturing and maintenance of a mold, and the economy is poor.

The present invention has been made in view of the above points, and forms a press die each time which can be attached to a pressurizing device of a general-purpose press and can be formed corresponding to various types of three-dimensional curved surfaces. It is extremely easy and easy, and this die has high precision, high durability, and economical economical hot working on a three-dimensional curved surface. 3D extra-thick plate that can be formed by reducing the pressing force of the fulcrum rod. It is an object of the present invention to provide a curved surface press molding method.

[Means for solving problems]

In the method of press-molding a thick plate of a work material in a heated state between upper and lower presses to form a three-dimensional curved surface in the method described above, the protruding height is increased depending on the desired three-dimensional curved surface formed on the work material. Between the end faces of the movable fulcrum rods of the upper and lower presses provided with a plurality of movable fulcrum rods of which the height is adjusted and a supporting side plate surrounding the movable fulcrum rods and having a predetermined projecting height. After arranging the dummy plates to be removed later with the pressing plates on both the upper and lower sides, press this to form a desired three-dimensional curved surface on the pressing plates through the dummy plates, and then the desired cubic The upper and lower push plates with the original curved surface are fixedly connected to the end faces of the supporting side plates of the upper and lower presses respectively to form the pressing faces of the upper and lower presses, and then the dummy plate is removed, and then between the pressing plates of the upper and lower presses. Sandwiching the workpiece, by so as to form a desired three-dimensional curved surface which is pressed by the upper and lower press the workpiece is achieved.

[Action]

Since the above means is provided, it is sufficient to manufacture a pressing plate for each molded product having a desired three-dimensional curved surface, eliminating the need for a mold as in the conventional case, and pressing the upper and lower parts with supporting side plates and movable fulcrum rods. Can be attached to a general-purpose pressure mechanism and used.

〔Example〕

Hereinafter, the method for press-molding a three-dimensional curved surface of an extremely thick plate according to the present invention will be described with reference to FIGS.

In these figures, 1 is a movable fulcrum rod, 2 is a pressure receiving head of the movable fulcrum rod 1, 3 is a supporting rod male screw, 4 is a locking ring, 5 is a jack outer cylinder, and 6 is a movable fulcrum portion. 7 is an upper support plate, 8 is a lower support plate, 9 is an outer frame, 10 is a side plate pressure receiving member, 11 is a jack frame part, and 12 is a supporting side plate, which is a workpiece.
Most of the pressing force for deforming the work piece 20 during press forming is to be borne. 13 is a bolt, 14 is a cooling medium supply / discharge pipe, 15 is a supporting side plate portion, 16 is a push plate, 17 is a water pipe,
18 is a water passage hole, 19 is a welded part, 21 is a dummy plate, 22 is a welded part, 23 is a lower press table, 24 is an upper press table, 32 is an upper press, and 33 is a lower press.

In the present embodiment, a plurality of movable movable fulcrum rods 1 each having a protruding height adjusted according to a desired three-dimensional curved surface formed on the workpiece 20 and the movable fulcrum rod 1 are surrounded,
In addition, between the movable fulcrum rods 1 of the upper and lower presses 32 and 33 provided with the supporting side plate 12 formed to have a predetermined protruding height, between the end faces of the supporting side plate 12 and the upper and lower surfaces of the dummy plate 21 to be removed later, pressing plates 16 are provided. , 16 are arranged and then pressed to form a desired three-dimensional curved surface on the pressing plates 16 and 16 via the dummy plate 21, and then the upper and lower surfaces on which the desired three-dimensional curved surface is formed. The push plates 16 and 16 of the upper and lower presses 32 and 33, respectively.
The upper and lower presses 32, 33 are fixedly connected to the end face of the supporting side plate 12 of
After removing the dummy plate 21, the workpiece 20 is sandwiched between the pressing plates 16 and 16 of the upper and lower presses 32 and 33, and the workpiece 20 is pressed by the upper and lower presses 32 and 33 to be processed. A desired three-dimensional curved surface was formed on the material 20. By doing so, it is sufficient to manufacture the push plates 16 and 16 for each molded product having a desired three-dimensional curved surface, eliminating the need for a mold as in the conventional case, and supporting the side plate 12 and the movable fulcrum rod 1.
The upper and lower presses 32 and 33 with the attached can be attached to a general-purpose pressing mechanism and can be used, and can be attached to a general-purpose press's pressurizing device, as well as molding for various types of three-dimensional curved surfaces. It is extremely easy and easy to form a press die each time, and this die has high precision, high durability, and economical hot working on a three-dimensional curved surface. It is possible to obtain an extremely thick plate three-dimensional curved surface press-molding method capable of forming by reducing the pressing force of.

That is, the molding apparatus is roughly configured by the movable fulcrum portion 6, the jack frame portion 11, the supporting side plate portion 15, and the push plate 16.

The movable fulcrum portion 6 receives a load in contact with the push plate 16 by the movable fulcrum rod 1 and the pressure receiving head 2, and a supporting rod male screw 3 having a sufficient load bearing capacity is provided on the outer periphery of the movable fulcrum rod 1. . Then, the height dimension h of the pressure receiving head 2 can be freely adjusted by rotationally driving the movable fulcrum rod 1 by screwing connection with the jack outer cylinder 5, and the pressure receiving head 2 for each fulcrum can be adjusted. After the ball-center height height h is calculated and adjusted and set, it is fixed by the locking ring 4. As the movable and load-bearing mechanism, a hydraulic cylinder can be used in addition to the above-described screwing method. In the movable fulcrum part 6, the cooling medium A is supplied to and discharged from the space surrounded by the push plate 16, the support side plate part 15, and the jack frame part 11 by the cooling medium supply / discharge pipe 14, and is cooled by the heat influence during hot working. Is prevented (see FIGS. 1 and 2).

The jack frame part 11 includes an outer frame 9, a side plate receiving plate 10, an upper support plate 7,
The lower support plate 8 has a strength structure capable of withstanding the vertical pressure P ′ acting on the jack outer cylinder 5, the side pressure P ″ generated by the slope support and the rotational moment acting on the jack outer cylinder 5 generated by the side pressure P ″. It has such a structure that it supports each movable fulcrum (see FIGS. 1 and 2).

The supporting side plate portion 15 includes a supporting side plate 12 for molding the cross-sectional shape portion including the maximum protruding portion of the mold curved surface and the peripheral portion of the workpiece 20, the tightening bolts 13, the cooling medium feeding, and the cooling medium feeding of the discharge connecting pipe. It consists of a drain pipe 14. Adjacent portions of the plurality of support side plates 12 are joined to each other by welding, and further, the support side plates 12 are positioned and fixed to the outer frame 9 of the jack frame portion 11 by tightening bolts 13 (see FIGS. 1 and 1). (See Figure 2).

The pressing plate 16 is molded into a required three-dimensional curved surface by a method described later, and then fixedly connected to the supporting side plate 12 by a welded portion 19 to form a three-dimensional curved surface molding die. The push plate 16 is provided with a required number of water passage holes 18 to prevent thermal deformation of the surface of the push plate 16 during hot working by water cooling and to control the cooling rate of the workpiece 20 (first). See FIG. 2).

FIGS. 3 to 5 show the main components of the molding apparatus. In FIG. 3, the supporting side plate 12 and the pressing plate 16 formed in advance on a required three-dimensional curved surface are combined and connected by welding or the like. The so-called middle shell-like mold part is shown.
FIG. 4 shows the jack frame portion 11 in which the push plate 16 (see FIGS. 1 and 2) is held by the movable fulcrum rod 1, and the push plate 16 (see FIG. 1, FIG. (See FIG. 2) is supported from the inside to share the withstand pressure. Then, the jack frame portion before the support side plate 12 is fixed to the push plate 16 (both see FIG. 2) and is attached to the outer frame 9.
11 shows the assembled state, and the support side plate 12 (see FIG. 2) is fixed to the jack frame portion 11 by the bolt 13 and the screw hole 13a provided in the jack frame outer frame 9 as shown in FIG. It is getting done.

Then, the supporting side plate 12 projecting at a predetermined height for forming the required three-dimensional curved surface and the supporting side plate 12 are joined to the jack frame part 11 as well as the supporting side plate 12, and each movable fulcrum has a required height. With each movable fulcrum portion 6 set to the calculated dimension h, a necessary three-dimensional curved surface to be a pressing surface of the press plate 16 (see FIG. 2) is formed. In the upper press 32 as well as in the lower press 33, the support side plate 12 and each movable fulcrum rod 1 are
The required three-dimensional curved surface is formed.

Since the required curved surface with which the pressure receiving head 2 contacts is not constant, the height of each movable fulcrum portion 6 is not fixed. Therefore, by setting the ball center position of the ball radius r of the pressure receiving head 2 to the calculated dimension h, the molding accuracy can be improved. Reserved. The structure of the pressure receiving head 2 is
There are the hemispherical structure shown in the figure and the known spherical joint type structure shown in Fig. 10. Both of them are designed so that the calculated dimension h is set at the spherical center position in contact with the required curved surface height with the radius r. ing. Further, the structure of the pressure receiving head 2 has been described for the case where the contact portion is spherical, but it is preferable that the pressure receiving head 2 has a curved surface shape corresponding to a three-dimensional curved surface and suitable for pressing the pressing plate.

Next, the order (method) of forming the pressing plate on the required three-dimensional curved surface will be described with reference to FIGS. 6 to 8. First, as shown in FIG. 6, a pair of push plates 16 and 16 serving as upper and lower mold surfaces.
Are fixed to both surfaces of the dummy plate 21 by the temporary welding portions 22. The thickness of the dummy plate 21 is the same as that of the workpiece 20 (first
It is preferable that the thickness is substantially the same as that shown in FIG. 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 plate thickness of the push plate 16, and is movable in contact with the pressure receiving head 2 (see FIG. 2). It is provided at a position where it does not overlap the fulcrum contact T (see FIG. 3), and the diameter of the water passage hole 18 is 1/2 or less of the plate thickness, so that it does not collapse when the dummy plate 21 is clamped. . Then, the pressing plate 16 and the dummy plate 21 in the state shown in FIG. 6 are red-heated to 1000 ° C. or more in a heating furnace to be sufficiently softened, and a pair of upper and lower three-dimensional curved contact points are formed as shown in FIG. Pressure molding is performed by a molding device including the supporting side plate 12 and the jack frame portion 11 having the movable fulcrum portion 6. In this case, the push plate 16, the movable fulcrum rod 1 and the supporting side plate 12 are not cooled. The reason for this is that when cooled, the deformation of the push plate 16 is restrained and the desired three-dimensional curved surface cannot be smoothly and accurately formed by the support side plate 12 and the movable fulcrum rod 1.

FIG. 8 shows a state in which the pressure molding is completed. In the state in which the pressure molding is completed, the push plate 16 is firmly fixed to the supporting side plate 12 by the welded portion 19 to form the molding die shown in FIG. To be done. The welded portion 22 (see FIG. 6) that joins the push plate 16 and the dummy plate 21 breaks due to the difference in phase deformation during pressure molding. The dummy plate 21 that has been removed and has been molded is removed. Then, the pressing plate 16 and the supporting side plate 12 are joined and fixed by the welded portion 19 so that the hollow portion is in the state of being formed by the pressing plate 16, the supporting side plate 12 and the jack frame portion 11, A pair of three-dimensional curved surface forming devices for the upper and lower presses 32, 33 is completed. The dummy plate 21 can be used later to confirm the molding accuracy.

Next, after the dummy plate 21 is removed, a molding process between the pressing plates 16 and 16 will be described with reference to FIG. After confirming the forming accuracy of the dummy plate 21 (see FIG. 8) formed in advance or based on the result of the test work, the curved surface accuracy of the push plate 16 is corrected by adjusting the movable fulcrum portion 6. The cooling medium A is fed to the hollow portion in which the movable fulcrum portion 6 is built in, and the cooling water W is fed to the inside of the push plate 16 for cooling. After such preparations, a pair of three-dimensional forming devices including an upper press 32 and a lower press 33, which are attached to the upper press table 24 and the lower press table 23, respectively, heat the workpiece to a required temperature in advance. The material 20 is set between the push plates 16, 16 of the upper and lower presses 32, 33 as shown. Then, the molding pressure P is applied to carry out molding, the pressurization state is continued to a certain temperature, and after cooling by the cooling effect of the surface of the pressing plate 16, it is taken out and the molding process is completed.

In the present embodiment, a combination of a plurality of movable fulcrum rods 1 and supporting side plates 12 share and support the forming load of the fulcrum portion, and the work material formed as shown in FIG.
Since 20 is a saddle shape, the maximum load part is the supporting side plates 12 and 12 that face each other and share the forming load of these fulcrums, and most of the load at the time of forming is the supporting side plate 12. The movable fulcrum portion 6 is in such a state that it bears the finishing molding load in order to improve the accuracy in the final stage of molding. Therefore, the support side plate
It is necessary to arrange 12 at the position of the cross section including the largest protrusion on the surface of the push plate 16. FIG. 12 (a) is a perspective view of the workpiece 20 formed on the saddle-shaped curved surface described in FIGS. 1 to 11,
(B) is an explanatory view showing a corresponding relationship between the support side plates 12 of the upper and lower presses for molding (A). In the shape shown in (b), since the maximum protruding portion is located on the outer peripheral portion on both the upper and lower pressing surfaces, the supporting side plate 12 to be attached corresponding to the maximum protruding portion has an arrangement structure forming an outer frame. FIG. 13 (a) is a perspective view of the material 20 to be processed having a spherical curved surface of another embodiment, and (b) is the supporting side plate 12 of the upper and lower press forming (a) at the maximum load part. It is explanatory drawing which shows the state arrange | positioned. In the shape shown in (b),
The upper mold has a supporting side plate 12a corresponding to the maximum pressing force on an intersecting line orthogonal to each other that passes through the center with the largest protrusion,
In the lower mold, the support side plate 12 is arranged on the outer frame portion.

In forming the three-dimensional curved surface by the supporting side plate 12 and the plurality of movable fulcrum rods 1, the main body to be deformed under pressure is the supporting side plate 12
Therefore, the movable fulcrum rods 1 press and deform the portions in contact with the respective push plates 16, and accordingly, the portions not in contact with the supporting side plates 12 are finished by the movable fulcrum rods 1 (first). See figure).

As described above, in this embodiment, first, the dummy plate 21
Top and bottom presses with the required three-dimensional curved surface using
A plurality of movable fulcrum rods 1 that press-form the three-dimensional curved surfaces of the pressing plates 16 and 16 that are the pressing surfaces of the two and 33, and press the respective portions of the curved surfaces, and surround this movable fulcrum rod 1 It is formed by the support side plate 12 that presses and forms the peripheral portion (see FIGS. 6 to 8). Then, press the upper and lower plates 16 and 16 so that they serve as the pressing surfaces of the upper and lower presses 32 and 33.
It is attached to 32 and 33, and the workpiece 20 is pressed into a molded article having a desired three-dimensional curved surface. That is, what corresponds to the conventional forming die is formed by a plurality of movable fulcrum portions 6 and a pair of upper and lower supporting side plates 12 and push plates 16, respectively. The support side plate 12 and the push plate 16 may be manufactured according to the original curved surface (see FIG. 11). Therefore, every time a molded product having each required three-dimensional curved surface is pressed, a pressing plate 16 having this three-dimensional curved surface is created, and then a pressed molded product is manufactured using this pressing plate 16. Therefore, unlike the conventional case, the total die is not required and a large number of man-hours are not required. In addition, it is extremely easy to improve the accuracy of the press molding curved surface and has high durability, making it suitable for general-purpose press dies.
A molding device including the movable fulcrum portion 6, the support side plate portion 15, and the pressing plate 16 can be attached to use a press-type pressing mechanism. Further, the push plate 16 can also control the cooling rate of the workpiece 20 (see FIGS. 1 and 2).

Next, the results of experimentally implementing the method of this embodiment will be described below. After forming the desired three-dimensional curved surface on the pressing plate using the dummy plate as described above, using this pressing plate, the thickness of the extra-thick plate is 80 mm, the length and width of the 13Cr stainless steel plate of 1.5 m × 1.5 m When molding into a substantially saddle-shaped three-dimensional curved surface, the plate thickness is 50
An outer frame is formed with a supporting side plate made of mm steel mild steel as shown in Fig. 12 (b), a load of 1200 tons is applied to the work piece heated to 950 ° C, and 16 movable fulcrum rods and supporting side plates are used. It was molded by bearing the support. As a result of actual measurement, the load load per point of the movable fulcrum is 20 tons at maximum, and molding can be performed with a small load of 30% or less compared to molding with multiple movable fulcrum rods without using the supporting side plate. Atsuta Further, the molding accuracy for the required curved surface of the present embodiment is ± 2.0 mm including the reproduction accuracy when the pressing plate is molded, the work material is press-molded with this pressing plate, and the pressing plate is used again later. It was as follows.

As described above, according to the present embodiment, when a press-formed product having a desired three-dimensional curved surface is obtained, a pressing plate is manufactured for each of the molded products having different three-dimensional curved surfaces. It is possible to attach and use the upper and lower presses to which a supporting side plate and a movable fulcrum rod are attached to a general-purpose pressurizing mechanism without using a mold. And, it is extremely easy to form a press-type die that can be formed corresponding to various kinds of three-dimensional curved surfaces, corresponding to each curved surface each time,
This mold has high precision, high durability and can improve economic efficiency,
Further, the pressing force of the movable fulcrum rod can be reduced.

〔The invention's effect〕

As described above, according to the ultrathick plate three-dimensional curved surface press forming method of the present invention, it is possible to attach to a pressurizing device of a general-purpose press and to perform molding corresponding to various kinds of three-dimensional curved surfaces. It is extremely easy and easy to form a die each time, and this die has high precision and high durability, and economically, the hot working is performed on the three-dimensional curved surface of the extremely thick plate. The movable fulcrum rod pressing force is applied. It has the effect of reducing the molding and molding.

[Brief description of drawings]

FIG. 1 is an explanatory view of a forming apparatus for carrying out the method for forming a three-dimensional curved surface of an extremely thick plate according to the present invention, FIG. 2 is a vertical cross-sectional view excluding the upper press shown in FIG. 1, and FIG. 3 is the metal shown in FIG. FIG. 4 is a perspective view showing the mold forming portion, FIG. 4 is a perspective view of the lower press shown in FIG. 1, FIG. 5 is an explanatory view of supporting side plate assembly to the jack frame portion of FIG. 4, and FIG. FIG. 7 is a perspective view of a material assembled state with the pressing plate, and FIGS. 7 and 8 are vertical sectional views of the dummy plate of FIG. 6 before and after pressure molding using the molding apparatus of FIG. 1, respectively. 9 and 10 are cross-sectional explanatory views of the pressure-bearing head of the movable fulcrum rod of FIG. 1, respectively, and FIG. 11 (a) is an explanatory view of the workpiece just before forming by the forming apparatus of FIG. 1, (b). Is a cross-sectional view of the work piece formed by (a), FIG. 12 (a) is a perspective view of a molded product formed by the apparatus of FIG. 1, and (b) is Upper and lower molds of the supporting side plate illustration for molding a molded article of a), FIG. 13 (b) is a perspective view of a molded product of another embodiment which is molded by the molding apparatus of FIG. 1, (b)
Is an explanatory view of upper and lower supporting side plates for molding the molded article of (a),
FIG. 14 and FIG. 15 are explanatory views in which a male mold, a molded product, and a female mold of a conventional integrated total mold and lattice structure mold, respectively, are arranged in the order of connection. 1 ... Movable fulcrum rod, 2 ... Pressure receiving head, 12 ... Support side plate,
16 ... Pressing plate, 20 ... Working material, 21 ... Dummy plate, 32 ... Upper press, 33 ... Lower press.

Front page continued (72) Inventor Takamitsu Nakazaki 3-1-1, Saiwaicho, Hitachi, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Junzo Komatsu 3-1-1, Saiwaicho, Hitachi, Ibaraki No. 1 Hitachi, Ltd. Hitachi factory (72) Inventor Shinobu Watanabe 3-1-1, Saiwaicho, Hitachi City, Ibaraki Prefecture Hitachi Ltd. Hitachi factory (72) Inventor Naoichi Ando Saiwaicho, Ibaraki Prefecture 3-1, 1-1 Hitachi Ltd. Hitachi factory

Claims (7)

[Claims] 1. A method of press-forming a thick plate of a workpiece in a heated state between upper and lower presses into a three-dimensional curved surface according to a desired three-dimensional curved surface formed on the workpiece. A plurality of movable fulcrum rods whose protrusion heights are adjusted; and a movable side fulcrum rod of the upper and lower presses, which surrounds the movable fulcrum rods and is provided with a supporting side plate formed to have a predetermined protrusion height. After arranging between the end faces, a dummy plate to be removed later having push plates provided on both upper and lower surfaces thereof, the press plate is pressed to form the desired three-dimensional curved surface on the push plate through the dummy plate, and then this After pressing the pressing plates on the upper and lower surfaces on which the desired three-dimensional curved surface is formed, respectively, to the end surfaces of the supporting side plates of the upper and lower presses to form press pressing surfaces of the upper and lower presses, the dummy plate is removed, and then the An extremely thick plate three-dimensional curved surface characterized by sandwiching the work material between the pressing plates of the lower press and pressing the work material by the upper and lower presses to form the desired three-dimensional curved surface on the work material. Press molding method. 2. The projection height of the supporting side plate corresponds to the shape of the pressed deformed portion of the work material, and is formed so that the work material is mainly subjected to pressure deformation. The extra-thick plate three-dimensional curved surface press-molding method according to claim 1. 3. The protruding height of the plurality of movable fulcrum rods is
The extra-thick plate three-dimensional curved surface press-molding method according to claim 1, wherein the three-dimensional curved-surface press-molding method is adjusted so that each of the curved surfaces of the pressing plate is press-moldable. 4. The three-dimensional curved press forming method according to claim 1, wherein the upper and lower presses are formed so that a refrigerant can flow therein. 5. The method for press-molding an extremely thick plate three-dimensional curved surface according to claim 1, wherein the push plate has cooling water formed therein. 6. An extremely thick plate three-dimensional curved surface press-molding according to claim 1, wherein the pressing plate and the dummy plate are heated when the pressing plate is formed into a desired three-dimensional curved surface. Method. 7. The extra-thick plate three-dimensional curved surface according to claim 1, wherein the pressing plate, the movable fulcrum rod, and the supporting side plate are kept at a low temperature during the pressure forming of the workpiece. Press molding method.