JPH044049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a press machine with a universal die used for bending outer panels of ships, various tanks, etc.

(Prior art) Conventionally, methods such as bending rollers, press machines, or linear heating and rapid cooling have been used to bend relatively thick steel plates for ships and various tanks. Exterior panels with complex shapes, such as exterior panels, must be processed by skilled workers using a combination of the various processing methods mentioned above, spending many man-hours, making processing costs extremely high and making it difficult to automate and save labor. Ta.

Therefore, as described in Japanese Patent Publication No. 46-37088, the mold is divided into small pieces, each mold head is connected to the tip of each support rod with a ball joint, and each support rod is controlled numerically. It was invented based on the idea of the inventor of the present application that the curved surface of the molding die could be freely set by controlling the height, and although considerable research has been done on this, it has not yet been put into practical use. I haven't reached it yet.

The main reason for this was that the production costs were so high that it was not profitable when compared with the effects of labor saving and automation.

That is, in the above-mentioned press machine, 200 to 300 of the above-mentioned support rods are arranged in many rows and many columns at a pitch of about 200 to 300 mm, and each support rod has a diameter of about 15 to 300 mm.
It is necessary to apply a pressing force of 30 tons.

In order to configure the above support rod with a hydraulic cylinder and apply pressing force while precisely controlling the height, not only the hydraulic system and control system become extremely complicated, but the hydraulic cylinder itself and the hydraulic equipment and control equipment are also expensive. become.

In addition, when the above support rod is composed of screw shafts with a diameter of approximately 50 to 100 mm and a stroke of approximately 400 to 600 mm, each of which is driven by a special small motor and whose height is controlled by numerical control, a large diameter precision screw shaft or Not only is the support bearing mechanism and drive mechanism extremely complicated and expensive compared to the above-mentioned hydraulic cylinder, but also the above-mentioned mechanisms and height detection mechanism must be assembled in a narrow space, resulting in poor durability and high risk of failure. It also becomes difficult to repair.

(Object of the invention) The present invention was made in view of the above problems, and
By separating the drive mechanism and locking mechanism of the support rod, it is possible to drive the support rod with a small drive means, and the positioned support rod can be clamped with a simple clamping means, thereby improving the structure and control of each part. The purpose is to simplify and downsize equipment, significantly reduce manufacturing costs, and increase durability and versatility.

(Structure of the Invention) A press machine with a universal mold according to the present invention has a plurality of vertical guide holes opened at appropriate intervals in each of a pair of upper and lower mold fixing plates of the press machine, and each of the guide holes. A support rod is attached to the mold head so as to be slidable up and down, a mold head is swingably attached to the tip of each of the support rods that protrudes out of the plate surface, and each mold head is attached to at least one of the mold fixing plates. A drive means for driving the support rod up and down with respect to the mold fixing plate, and a corresponding drive means to drive each support rod attached to at least one of the mold fixing plates to move it out of the plate surface to an arbitrary height. The present invention is characterized by comprising a clamping means capable of releasably fixing each of the supporting rods to the mold fixing platen in a protruding state.

(Function) In the press machine with a universal mold according to the present invention, each of the pair of upper and lower mold fixing plates is provided with a plurality of vertical guide holes at appropriate intervals, and each of the guide holes has a supporting member. The rods are mounted so as to be slidable up and down, and a mold head is swingably mounted on the tip end of each of the support rods that protrudes out of the board surface.

A driving means for driving each support rod mounted on at least one mold fixing plate up and down with respect to the mold fixing plate, and a driving means for driving each support rod mounted on the at least one mold fixing plate in a corresponding manner. At least one of the molds is clamped by clamping means that can be driven by the drive means to releasably fix each support rod to the mold fixing plate while protruding to a desired height outside the platen surface. A plurality of support rods mounted on a fixed plate are independently driven up and down by driving means so that the mold heads mounted thereon form a predetermined curved surface of the mold, and then these plurality of support rods are driven independently. They can be fixed with corresponding clamping means. Since each of the support rods can be fixed by the corresponding clamping means in a state of protruding to an arbitrary height outside the plate surface, any desired curved surface of the molding die can be formed in the above manner.

When providing a driving means and a clamping means for the support rods of both mold fixing plates, after forming the desired molding mold curved surfaces that form a pair of upper and lower parts on both mold fixing plates as described above, After setting a steel plate workpiece, molding can be performed by pressing one mold fixing plate against the other mold fixing plate using a hydraulic cylinder or the like.

When the driving means and the clamping means are provided only for the support rod of one mold fixing plate, the desired mold curved surface can be formed on one mold fixing plate as described above, If hydraulic cylinders or the like are provided to advance the plurality of support rods of the mold fixing plate, it is possible to press the workpiece against the curved surface of the molding die and mold it.

(Effects of the Invention) According to the press machine with a universal mold according to the present invention, each of the plurality of support rods attached to at least one of the mold fixing plates can be driven up and down by the driving means, and can be moved freely from the plate surface. Since it is constructed so that it can be fixed with a clamping means in a state in which it protrudes in height, it is possible to form any desired curved surface of the mold, making it highly versatile.The structure of the support rod itself can be simplified, and each drive means The clamping means can be small and simple enough to be driven against its own weight and sliding friction resistance, and the clamping means can be configured with a small, small-stroke hydraulic cylinder using a wedge mechanism or other device with an extremely high power factor. .

Therefore, the structure of the plurality of support rods provided on at least one mold fixing plate, their driving means, and clamping means can be simplified, the structure can be made smaller, the durability can be increased, and the repair can be made easier. The manufacturing cost, which accounts for a large portion of the overall manufacturing cost, can be extremely reduced. Furthermore, by downsizing the driving means and clamping means, etc., the space constraints on the mold fixing platen are greatly alleviated, so it is possible to increase the diameter of the support rods and increase the pressing force acting on each support rod. The steel plates that can be processed with this press machine can also be applied to a wider range of applications.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

First, a main embodiment of a press machine with a universal mold is shown in FIGS. 1 to 9, and modifications of each part are shown in FIGS. 10 to 19.

This press machine with universal mold is the first
As shown in the figure, a fixed platen 1 (this corresponds to the mold fixed platen), corners 2 erected at the four corners of this fixed platen 1, and a connecting plate 3 that connects the tops of the four square columns 2.
and a movable plate 4 (corresponding to the mold fixed plate) located above the fixed plate 1 and facing the fixed plate 1, which is slidably guided by four square columns 2 and has a pair of left and right main cylinders. A movable platen 4 that is driven up and down by a hydraulic cylinder 5 (hydraulic cylinder), a hydraulic unit 6 that has a hydraulic supply source and valves for the hydraulic drive means attached to the main cylinder 5 and the movable platen 4, and a fixed platen 1. It basically comprises a hydraulic unit 7 having a hydraulic supply source and valves for the attached hydraulic drive means, and a control device.

The fixed platen 1 has a large number of lower support rods 9 mounted vertically at predetermined pitches (for example, about 150 to 200 mm) in the front, back, left and right directions, and each mold head 10 swings at the upper end of each lower support rod 9. The mold head 10 of the lower support rod 9 is mounted freely by driving each lower support rod 9 in the vertical direction, positioning it by numerical control, and then fixing it with a clamping means.
The curved surface of the molding die is formed in this way.

A large number of upper support rods 11 are mounted vertically on the movable platen 4 so as to correspond to each of the lower support rods 9, and each mold head 10 is swingably attached to the lower end of each upper support rod 11. attached,
Each upper support rod 11 is adapted to be driven up and down by hydraulic drive means.

Next, the structure of each part will be explained in detail.

As shown in FIGS. 3 to 6, the lower support rods 9 are, for example, steel cylindrical rods with a diameter of approximately 50 to 80 mm, with a spherical portion 9a of a ball joint integrally formed at the upper end. 9 is attached to the vertical guide hole 12 of the stationary platen 1 so as to be slidable up and down,
The spherical portion 9a is exposed above the board surface, and a steel mold head 10 is swingably mounted thereon by a ball joint.

As a driving means for driving each lower support rod 9 upward against its own weight and sliding friction resistance, a lower cylinder 13 consisting of a small-diameter double-acting hydraulic cylinder is mounted on the fixed plate 1 directly below each guide hole 12.
The piston rod 13a is attached vertically to the lower surface, and the piston rod 13a is connected to the lower end of the lower support rod 9, and the hydraulic pressure supply path 14 to each lower cylinder 13,
15 is connected to a hydraulic pressure supply source 17 via each oil passage switching valve 16 in the hydraulic unit 7 (FIG. 7).

Further, a sprocket 18a has a height detection device 18 attached to the lower end of the lower cylinder 13 for detecting the height position of each lower support rod 9, and a rotary encoder (not shown), for example, for detecting rotation of the sprocket 18a. The above sprocket 18a
The chain 18b is engaged with the lower end of the lower support rod 9, and has one end connected to the bottom of the fixed platen 1 via a small diameter coil spring 18c, and the other end connected to the lower end of the lower support rod 9 via a guide block 18d. and the lower support rod 9.
The rotation of the sprocket 18a due to the vertical movement of the sprocket 18a is detected by the rotary encoder, and the detection signal is outputted to the control device 8.

As a result, while the height position of each lower support rod 9 is detected by the height detection device 18, the control device 8
By switching the oil passage switching valve 16 and controlling the lower cylinder 13, it is possible to drive and position each lower support rod 9 to a desired height position.

The guide portion of the guide block 18d moves up and down along the guide groove 19 on the side of the guide hole 12, so that the lower support rod 9 does not rotate.

Next, the clamping device 20 for clamping each of the lower support rods 9 positioned as described above to the fixed platen 1 is constructed as follows.

A square groove 21 is recessed in the board surface of the fixed platen 1 along a diagonal line connecting the central axes of each of the four lower support rods 9, and a circular recess 22 is formed in the fixed platen 1 at the intersection of the diagonal lines. A clamp cylinder 2 consisting of a stroke hydraulic cylinder is provided directly below the circular recess 22.
4 is formed within the fixed platen 1.

The wedge block 25 disposed in the circular recess 22 is connected to the upper end of the piston rod 24c of the clamp cylinder 24, and the clamp block 26 slides into each square groove 21 between the wedge block 25 and each lower support rod 9. It is attached so that it can move freely.

The wedge block 25 is formed by integrally forming dovetail fitting convex portions 25a on each side surface of an inverted truncated pyramid, and each inclined end surface 26a of the clamp block 26 abuts on each side surface of the wedge block 25, and also on various inclined end surfaces 26a. The wedge block 25 and the clamp block 26 are connected by slidably fitting the dovetail groove fitting convex block 25a into the recessed dovetail groove 26d. Further, the slope of each side of the wedge block 25 with respect to the vertical plane is, for example, 1/10 to 1/30, making the power factor of this wedge extremely large.

The clamp portion 26c at the other end of the clamp block 26 is formed into a partially cylindrical shape so as to broadly contact the circumferential surface of the lower support rod 9, and has a jagged slip prevention surface.

The clamp cylinder 24 is a double-acting hydraulic cylinder, and the clamp oil chamber 24A and the clamp release oil chamber 24B are connected to oil passages 2 that are transparently provided in the fixed plate 1, respectively.
Pressure oil is supplied and discharged from 4a and 24b. Above oil path 2
4a, 24b are in communication with all the clamp cylinders 24, and the upstream portions of these common oil passages 24a, 24b are connected to a hydraulic pressure supply source 28 via an oil passage switching valve 27 in the hydraulic unit 7. Figure 7).

Each lower support rod 9 positioned as described above
When clamping, when pressure oil is supplied to the clamp oil chamber 24A and the wedge block 25 is driven downward, the wedge block 25 presses the clamp block 26 in the horizontal direction, and the lower support rod 9 is forcefully moved from four directions by the clamp part 26c. is clamped and fixed to the fixed platen 1.

When releasing the above clamp, clamp oil chamber 2
Release the clamp while draining the pressure oil of 4A oil chamber 24B
When the wedge block 25 is driven upward by supplying pressure oil to the wedge block 25, each clamp block 26 is slightly pulled back toward the wedge block 25 through the dovetail groove fitting, and each lower support rod can be attached to the lower support rod without being obstructed by the clamp block 26. 9 can be moved up and down.

Incidentally, reference numeral 29 is a dustproof cover plate for restraining the upward movement of the clamp block 26, and is fixed to the plate surface of the stationary plate 1 with bolts or the like.

Next, as shown in FIG. 6, the Atsupa support rod 11 is connected to the Atsupa cylinder 30, which is a relatively large-diameter hydraulic cylinder formed vertically in the movable platen 4.
A spherical part 11a of a ball joint is formed at the lower end of the upper support rod 11 that protrudes below the surface of the movable platen 4, and the mold head 10 is inserted into the ball joint through the ball joint. It is attached so that it can swing freely. Note that the cylinder hole 30a of the upper cylinder 30 and the rod insertion hole 30b of the cylinder end wall serve as guide holes.

The Atsupa cylinder 30 is a double-acting hydraulic cylinder, with a press oil chamber 30C and a press release oil chamber 30.
To D are oil passages 30c, which are transparently installed in the movable platen 4,
Pressure oil is supplied and discharged from 30d, and these oil passages 30c,
30d communicates with all the Atsupah cylinders 30, and the upstream portions of these common oil passages 30c and 30d are connected to the oil pressure supply source 32 via the oil passage switching valve 31 in the hydraulic unit 6 (Fig. 7). ).

The lower cylinder 13 merely drives the lower support rod 9 up and down against its own weight and sliding friction force, whereas each upper support rod 11 is driven by the hydraulic pressure of the press oil chamber 30C of the upper cylinder 30. The pressure of the pressurized oil and the cylinder diameter are set so as to generate a press force of, for example, about 10 to 30 tons per press.

When pressing a steel plate W using the above press machine, each lower support rod 9 is positioned at a predetermined height and clamped by a clamping device 20 to form a desired molding mold curved surface with the mold head 10. After carrying in and placing the steel plate W on the curved surface of the forming mold, the movable platen 4 is lowered to an appropriate height position via the main cylinder 5, and pressurized oil is supplied from the common oil passage 30c to the press oil chamber 30C of the Atsupa cylinder 30. is supplied to extend the upper support rods 11 downward, and the steel plate W is pressed by each mold head 10 onto each mold head 10 of each lower support rod 9, thereby press working. In this way, the steel plate W is pressed and formed by the evenly distributed load applied from the upper support rod 11 to the curved surface of the forming die.

At this time, as shown in FIG. 2, the upper and lower mold heads 10 are inclined along the curved surface of the mold due to the rigidity of the steel plate W, and the steel plate W is processed into a smooth curved surface.

However, the Atsupa cylinder 30 is divided into multiple groups and the oil passages 30c, 30 are connected to each group.
d is communicated to supply pressure oil to each group in turn, the hydraulic pressure supply source 32 can be downsized.

In addition to the above, first, with the upper support rod 11 fully extended and the press oil chamber 30
Pressing may be carried out by lowering the movable platen 4 with the main cylinder 5 while relieving excess oil pressure from a relief means that prevents excess oil pressure from occurring in C.

Next, the control system, drive system, etc. of the press machine will be briefly explained based on FIGS. 7 to 9.

As shown in FIG. 7, the hydraulic unit 6 includes an oil passage switching valve 33 connected to the main cylinder 5 and its oil pressure supply source 34, and an oil passage switching valve 31 connected to the Atsupa cylinder 30 and its oil pressure supply source 32. The former is controlled by a main cylinder control section 35, and the latter is controlled by an atspa cylinder control section 36. However, both the above-mentioned hydraulic pressure supply sources 32 and 34 can be used as a common hydraulic pressure supply source.

The hydraulic unit 7 includes an oil passage switching valve 27 connected to the clamp cylinder 24 and its oil pressure supply source 28.
and each oil passage switching valve 16 connected to the lower cylinder 13 and its common hydraulic pressure supply source 17, the former being controlled by a clamp cylinder control section 37 and the latter being controlled by a lower cylinder control section 38. Output signals from each height detection device 18 are output to the lower cylinder control section 38. Incidentally, both of the hydraulic pressure supply sources 17 and 28 may be a common hydraulic pressure supply source.

Further, numerical control information 39 for numerically controlling the height position of each lower support rod 9 to form a desired mold curved surface is input to the lower cylinder control section 38.

The lower cylinder control unit 38 controls the oil passage switching valve 16 of each lower cylinder 13 based on the numerical control information 39 and the detection signal from each height detection device 18, so that each lower support rod 9 is connected to each lower cylinder 13 via each lower cylinder 13. The height position of is set, but
In this case, all the lower support rods 9 may be driven simultaneously and the height controlled, or each group of lower support rods 9 may be simultaneously driven and the height controlled, or the lower support rods 9 may be controlled one by one. The height may be controlled while being driven individually.

It is also possible that the lower cylinder control section 38 entrusts some of its functions to an external computer and performs computer numerical control (CNC).

As shown in FIG. 8, the numerical control information 39 includes at least information specifying each lower support rod 9 and a reference horizontal plane 23 (for example, a fixed platen) of a reference point of the lower support rod 9 (for example, point A in FIG. 9). Contains information indicating the height from the board surface (No. 1).

The information representing this height takes into account the amount of correction e that occurs when the mold head 10 is tilted as shown by the imaginary line in FIG. Although it is desirable to set the height correction amount e, it is also possible to ignore this height correction amount e.

By the way, as mentioned above, even if press working is performed on a predetermined molding die curved surface, it is not a complete plastic working, so the problem that the steel sheet W returns to a curved shape with a smaller curvature than the molding die curved surface due to spring back still remains. However, this problem can be solved by collecting data regarding springback and controlling the lower support rod 9 so that the molding die has a curved surface that takes into account the amount of springback in advance.

Then, the finished curved surface shape of the steel plate W after forming is detected by the height detection device 18 via the lower cylinder 13 and the lower support rod 9, and the detected information is output to the control device 8, and the information is used to It is also possible to create numerical control information for the second correction press process, or to output it as data externally using magnetic tape or press-out.

Hereinafter, the above embodiment can be partially modified as follows.

First modification: Since the movable platen 4 does not necessarily need to move up and down, the movable platen 4 is fixed to the prism 2 at a predetermined height position,
A hydraulic unit 6 is mounted on the movable platen 4 that rotates the connecting plate 3.
The connecting board 3, the main cylinder 5, and the attached devices 33, 34, and 35 for the main cylinder 5 are omitted.

Second modification: The movable platen 4 is equipped with the same components as the lower support rod 9, clamp device 20, and height detection device 18 of the fixed platen 1, and the height of the upper support rod is controlled in the same way as the lower support rod 9. The mold head 10 of the upper support rod corresponds to the curved surface of the mold head 10 of the lower support rod 9. The mold is configured to form a curved surface and to be pressed by the driving force of the cylinder 5.

Third modification: The same lower support rod 9 and clamp device 20 of the fixed platen 1 are attached to the movable platen 4, and
Each hydraulic device and each control device for this upper support rod and clamp device are provided, and the lower support rod 9
While or after forming the curved surface of the mold with the mold head 10 of the mold head 10, the movable platen 4 is lowered to a predetermined height position and the mold head 10 of the upper support rod is lowered.
With the lower support rods 9 in contact with the mold heads 10 of the lower support rods 9, the upper support rods are clamped by a clamping device.

In this way, the mold head 10 of the upper support rod can form a mold curved surface corresponding to the mold head 10 of the lower support rod 9, and with the driving force of the main cylinder 5, Can be pressed.

However, in the above case, the mold heads 10 of the lower support rod 9 and the upper support rod are arranged as shown in FIGS. 14 and 18 so that each mold head 10 automatically inclines along the slope of the curved surface of the mold. It is preferable to connect the vertical shaft with a tension coil spring 40 as shown in FIG.

In addition, the slight increase in the vertical thickness due to the inclination of the steel plate W to be machined is resolved by using the upper support rod as a positioning clamp and slightly adjusting the height of the lower support rod 9 downward by the above increase. be able to.

According to the above configuration, the structure of the upper support rod can be simplified, the driving means thereof can be made smaller, and the manufacturing cost of the press machine can be significantly reduced.

Fourth Modification: In the clamp device 20, the wedge block 25 drives two clamp blocks 26 symmetrically, and each lower support rod 9 is configured to be clamped from two directions by the clamp portion 26c. In this case, a large clamping force can be exerted with the clamp cylinder 24 having the same capacity.

Also, with wedge block 25, 2 or 1
to drive the clamp blocks 26,
Each lower support rod 9 may be pressed against the circumferential surface of the guide hole 12 from one direction.

In this case, the number of clamp cylinders 24 can be reduced, and a larger clamping force can be exerted with the clamp cylinders 24 having the same capacity.

Fifth modification: As shown in FIG. 10, the double-acting clamp cylinder 24C of the clamp device 20A is fixed to the lower surface of the fixed platen 1, and its piston rod 24c is connected to the wedge block 25A, and the dovetail groove fitting is omitted. . Reference numeral 41 is a compression coil spring;
2 is a dust seal.

Sixth modification: As shown in FIGS. 11 and 12, the clamp cylinder 24 of the clamp device 20B is formed in the fixed platen 1 as described above, and is a clamp plate 26A made of high-tensile steel that is approximately cross-shaped in plan view. Each clamp portion 26C of the clamp plate 26A is formed in an inclined manner so that the central portion is slightly higher than the fixed platen 1.
Each clamp part 26C is supported by the board surface of
is in contact with or close to the peripheral surface of each lower support rod 9, and the tip of the piston rod 24c of the single acting clamp cylinder 24D is connected to the center of the clamp plate 26A.

Clamp oil chamber 2 of the above clamp cylinder 24D
When the piston rod 24c is driven downward by the hydraulic pressure supplied to the piston rod 4A, the driving force is boosted by the boosting mechanism of the clamp plate 26A, and with this extremely large force, each clamp portion 26C moves the lower support rod 9 from four sides. It is designed to be clamped by pressing almost horizontally. When the pressure oil is discharged, the elastic force of the clamp plate 26A causes it to return upward and the clamp is released.

Seventh modification: As shown in FIG. 13, the clamp device 20C has a screw shaft 43 that is common to a plurality of lower support rods 9, which rotates the tapered sleeve 44 and is screwed into the tapered sleeve 44. The clamp tube 45 is tightened from all around. Reference numeral 46 is a compression coil spring for urging the mold head 10 so that it does not tilt at a steep angle, and reference numeral 47 is a spring holder.

Eighth Modification: As shown in FIG. 14, the clamping device 20D is configured to clamp using the thermal expansion of metal.

That is, the clamp tool 26 having the liquid circulation path 49
B is placed on the fixed platen 1 via the heat insulating material 50,
By circulating hot oil or hot water through the circulation path 49, clamping is performed by the thermal expansion force of the clamp tool 26BB, and by circulating low temperature oil or water through the circulation path 49, the clamp is released. . Incidentally, reference numeral 40 is a tension coil spring that connects the side surfaces of the mold head 10 vertically and horizontally. still,
The clamp tool 26B may be heated with an electric heater or the like instead of the hot oil or hot water described above.

Ninth modification: As shown in Fig. 15, a small diameter lower cylinder 1
3A is formed in the fixed platen 1 near each guide hole 12.

10th modification: As shown in FIG. 16, a small-diameter single-acting lower cylinder 13B connected to a spring holder 51 is inserted into the center hole 52 of the lower support rod 9, and the lower support rod 9 is It is driven upward and also downward by the tension coil spring 53.

Eleventh modification: As shown in FIG. 17, a small-diameter double-acting lower cylinder 13C is formed within the lower support rod 9, and its piston rod 13c protrudes outside the lower end surface of the lower support rod 9 and is fixed to a platen with a fixture 54. Fixed to 1.

The piston rod 13c is made of a double pipe, and a forward oil chamber 13 is provided inside the piston rod 13c.
d and the double-acting oil chamber 1 slightly below the piston.
An oil passage opening to 3e is formed, and pressure oil is supplied and discharged from both oil passages to and from the lower cylinder 13C, thereby driving the lower support rod 9 up and down.
Note that reference numeral 18b is a chain of the height detection device 18.

With such a structure, the fixed platen 1 hardly protrudes below, so that the fixed platen 1 can be easily supported from below, and the lower cylinder 13C and the height detection device 18 can be easily repaired.

12th modification: As shown in FIG. 18, in order to increase the area ratio occupied by the mold head 10A,
is formed into a square shape with rounded corners in plan view. Note that the reference numeral 40 is the same as the tension coil spring in the eighth modification.

13th modification: As shown in FIG. 19, the mold head 10B is swingably attached to the upper end of the lower support rod 9A via a spherical seat, and the upper end of the tension coil spring 46A is attached to the upper end of the mold head 10B. By screwing into the spiral groove and screwing the lower end into the spiral groove of the lower support rod 9A, the mold head 10B is connected to the lower support rod 9A and urged to maintain a substantially horizontal position.

The above structure is suitable for large-diameter lower support rods 9A and upper support rods 11 that require large pressing forces for processing thick steel plates, etc., and can be manufactured at relatively low cost.

14th modification: In addition to the lower cylinders 13, 13A, 13B, and 13C, the lower support rod 9 is driven up and down via a small diameter screw shaft driven by an electric motor. It is also possible to configure it to do so.

By using a stepping motor or the like as the electric motor, the height detection mechanism may be omitted and the stepping motor may be numerically controlled by the control device 8.

15th modification: The clamp cylinders 24, 24C, 24D of the clamp devices 20, 20A, 20B may be arranged horizontally instead of vertically.

Further, it is also possible to use a clamping means in which the lower support rod 9 is tightened by a brake shoe with or without a lever using a horizontally oriented clamp cylinder.

16th modification: Over substantially the entire length of the lower support rod 9, at least one side surface is formed into a downwardly tapered shape,
The tapered portion can also be clamped by a clamping means, and in this way, the lower support rod 9 can easily withstand the pressing force, increasing reliability.

Seventeenth Modification: The tapered sleeve 44 and clamp tube 45 shown in FIG. 13 may not be screwed together, but may be clamped by sliding them relative to each other in the axial direction using a hydraulic cylinder or the like.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of a press machine with a universal mold, and FIG. 2 is a perspective view of a press machine with a universal die.
The figure is a partial front view showing the pressed steel plate, Figure 3 is a longitudinal sectional view of the main part of the fixed plate, Figure 4 is a cross-sectional view of the main part, Figure 5 is a sectional view taken along the line of Figure 4, and Figure 6 is a cross-sectional view of the main part. The figure is a longitudinal sectional view of the main part of the movable platen, Figure 7 is a block diagram showing the control system, Figure 8 is a conceptual diagram showing how the lower support rod is controlled in height to form a curved surface of the mold, and Figure 9 The figure is an explanatory diagram for the height correction amount when the mold head is tilted, Figure 10 is a view corresponding to Figure 3 showing the clamping device of the fifth modification, and Figures 11 and 12 are the sixth modification. Fig. 11 is a plan view of the clamp plate, Fig. 12 is a view corresponding to Fig. 3, Fig. 13 is a longitudinal cross-sectional view of the clamping device of the seventh modification, and Fig. 14 is the eighth modification. FIGS. 15, 16, and 17 are partial views corresponding to FIG. 3 of the clamping device, and FIGS. 15, 16, and 17 are vertical cross-sectional views of main parts of the fixed plate showing the lower cylinders of the 9th, 10th, and 11th modifications, respectively. , 18th
The figure is a plan view of a mold head according to a twelfth modification, and FIG. 19 is a longitudinal sectional view of a mold head according to a thirteenth modification and its mounting structure. 1...Fixed plate, 4...Movable plate, 12...Guide hole, 30a...Cylinder hole, 30b...Rod insertion hole, 9,9A...Lower support rod, 11...Top support rod, 10,10A , 10B...Mold head, 13, 13A, 13B, 13C...Lower cylinder, 30...Atsupa cylinder, 18...Height detection device, 8...Control device, 16...Oil passage switching valve, 17...Hydraulic pressure Supply source, 38...8 lower cylinder control section, 20, 20A, 20B, 20C, 2
0D... Clamp device.

Claims (1)

[Claims] 1. A plurality of vertical guide holes bored at appropriate intervals in each of the pair of upper and lower mold fixing plates of the press machine, a support rod that is vertically slidably attached to each of the guide holes, and each of the above-mentioned supports. The mold head is swingably mounted on the tip of the rod that protrudes outside the board surface, and the drive that drives each support rod mounted on at least one mold fixing plate up and down with respect to the mold fixing plate. and each supporting rod attached to at least one of the mold fixing plates is driven by a corresponding drive means to protrude to a desired height outside the plate surface, and each of the supporting rods is fixed to the mold fixing plate. A press machine with a universal die, characterized in that it is provided with a clamping means capable of being releasably fixed.