JPH10328749A - High ductility material molding apparatus and split mold restraint for the apparatus - Google Patents

Abstract

(57) [Problem] To provide a forming device capable of forming a highly ductile material efficiently and a restraint used for the forming device. SOLUTION: An actuator 20 is arranged outside a heating furnace 15 and a split mold restraining means 21a is arranged in the heating furnace, and the actuator 20 and the split mold restraining means 21a are connected by a driving force transmitting member 21. [Effect] The molding fluid pressure is reliably applied to the high ductility material without leakage, and the high ductility material can be molded favorably and efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-ductility material forming apparatus for deforming a high-ductility material such as a superplastic material by a fluid pressure such as air pressure into a desired shape, and a split mold restraint for the device. Things.

[0002]

2. Description of the Related Art A superplastic material whose deformation resistance rapidly decreases at a specific temperature has the advantage that it can be formed into a complicated shape or an extremely thin shape by utilizing its high ductility. Many molding methods have been proposed and put into practical use, and a blow molding method has been put to practical use as one of these molding methods. In this molding method, the work material is fixed by placing the work material inside the split mold and sandwiching the edge of the work material with the split mold while heating the split mold in a heating furnace or the like. A fluid such as compressed air is introduced into the split mold. The high ductility workpiece fixed by the split mold is deformed by the pressure of the fluid, and finally has a shape along the inner surface shape of the mold. By this method, a highly ductile workpiece can be formed into a desired shape at a large processing ratio.

[0003]

By the way, in the above-mentioned processing method, it is necessary to effectively apply a fluid pressure to the workpiece in order to process the workpiece satisfactorily.
First, it is important to ensure that external fluid pressure is introduced into the mold. Especially in the mold moving inside and outside the heating furnace,
Since the fluid needs to be introduced into the split mold in the heating furnace for the split mold whose position is changed, a movable fluid introduction tube and a special high-temperature resistant and air-tight leak-free tube are provided so that the fluid can be introduced into the split mold at any time. Requires a good sealing method. Conventionally, the above-mentioned problem has been solved by providing a heat-resistant packing in an air introduction pipe provided on a mold side and connecting an external air introduction pipe through the heat-resistant packing. However, such a connection method has a problem that the structure is complicated and the expensive heat-resistant packing is easily consumed, so that the cost is increased.

A second important point in that the fluid pressure is effectively applied to the workpiece is that there is no leakage of the fluid pressure from the split mold. However, the split mold has a problem that the upper mold is easily lifted by pressurizing a fluid, and the sealing property at the mating portion of the split mold is easily impaired. On the other hand, a high-power cylinder is disposed downward on the upper part of the heating furnace so as to generate a force for suppressing the upper die against the fluid pressure, and a restraining means for pressing the upper die with a rod of the cylinder is used. There is a way. However, in this method, heat inside the heating furnace is easily transmitted to the cylinder, and the packing and the like are easily damaged. Also, it is necessary to provide a structure for cooling the cylinder rod, change the cylinder rod to a heat-resistant material, and make the cylinder packing from a heat-resistant material.
There is a problem that the device becomes complicated and expensive. Also,
When the restraining force may be relatively small, there is a method of restraining the molds by using the tightening force of a bolt, a nut or the like without using the driving force as described above. However, in such a method, even if sufficient shrinkage is performed in the initial stage, the gap to be tightened is expanded due to thermal expansion during heating, or the tightening bolt is elongated by introducing fluid into the mold, and as a result, There is a problem that the binding force is reduced and the function as a seal is impaired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a high ductility material molding apparatus capable of reliably applying a fluid pressure to a workpiece and deforming it satisfactorily, and a split mold restraint for the apparatus. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a high ductility material molding apparatus of the present invention heats a split mold in which a work material is disposed in a heating furnace and processes the split mold with the split mold. In a high ductility material forming apparatus for applying a fluid pressure to a material and deforming a high ductility workpiece by the pressure, an actuator disposed outside the heating furnace and a split mold located in the heating furnace are provided. And a driving force transmitting member for connecting the actuator and the split type restraining means and transmitting a driving force of the actuator to the split type restraining means. In addition, the split mold restraint for a high ductility material molding apparatus of the present invention has a member having a different coefficient of thermal expansion in a part and utilizes a difference in thermal expansion between members having different coefficients of thermal expansion during heating. It is characterized in that a binding force applied to the split mold is generated.

Further, the high ductility material molding apparatus of the present invention
A high-ductility material molding in which a split mold in which a work material is disposed is heated in a heating furnace, and a fluid pressure is applied to the work material in the split mold to deform the high-ductility work material by the pressure. In the apparatus, a pressurized fluid introduction port is formed in the split mold, and a fluid introduction pipe communicating with the introduction port is disposed so as to be able to move away from and close to the introduction port. An inlet tube moving device is provided for moving the fluid inlet / outlet to and away from the port, and further pressing the fluid inlet tube toward the inlet after contact with the inlet.

The present invention is suitable for forming a superplastic material such as an aluminum alloy, a titanium alloy, an intermetallic compound, and a metal matrix composite material. In addition, the present invention has a high ductility, if not a superplastic one. It can also be applied to materials that can be molded by the apparatus configuration of the present invention. The split mold for molding the high ductility material may be a mold alone, or may include a die set such as a die base, a punch plate and other tools, and a tool support. The split mold is heated to a high temperature to indirectly heat the workpiece as described above. As a method for raising the split mold to a high temperature, a heating means is provided on the split mold or the split mold is placed in a heating furnace. There is a method of arranging the mold. The heating temperature of the split mold at this time can be determined so that the temperature of the workpiece to be heated indirectly becomes the target value. In addition, the fluid used for molding the high ductility material is usually compressed air, but other gases and the like,
Any suitable fluid can be used. The pressure at which the fluid is introduced is determined in consideration of the type of the workpiece, the processing ratio, and the like.
The desired deformed shape due to the fluid pressure is obtained, for example, when the workpiece follows the inner surface of the mold.

In introducing the fluid into the split mold, it is desirable to employ a structure in which the fluid introduction pipe is pressed against the introduction port of the mold to seal without using a complicated sealing structure. At the time of this pressing, it is desirable to use a material as rigid as possible for the fluid introducing tube so that the pressing force of the introducing tube moving device is surely applied to the pressing portion, and usually, a steel tube or the like is used. In order to ensure the tightness between the inlet pipe and the inlet, the tip of the inlet pipe is shaped like a nozzle. It is desirable to determine the shape of the inlet so that the airtightness can be obtained. In addition, the material of the nozzle may be changed to that of the introduction pipe in order to improve the sealing property,
For example, a material (copper or the like) having a smaller elastic coefficient than the introduction pipe may be used, and the sealing property may be improved by appropriately elastically deforming the nozzle by metal contact.

Further, in the present invention, the joint between the split dies is restrained so that the pressure of the fluid introduced into the mold is appropriately applied to the workpiece, thereby preventing pressure from leaking from the joint. It is desirable. When the restraint is performed by using the driving force of an actuator disposed outside the heating furnace, an appropriate actuator such as a hydraulic cylinder, a pneumatic cylinder, or a motor can be used. In addition, the restraining means arranged in the heating furnace may be any one that can restrain the split dies by receiving a driving force, and the structure is not particularly limited. The constraint can be performed by pressing one split mold against the other split mold, pulling one split mold toward the other split mold side, clamping both split molds, and the like.
Further, the actuator placed outside the heating furnace and the restraining means placed in the heating furnace are connected by a driving force transmitting means, and the driving force transmitting means transfers the driving force of the actuator to the restraining means. Anything that can be communicated,
The structure is not particularly limited. Since the driving force transmitting means is connected to devices inside and outside the heating furnace, it is usually arranged so as to penetrate the heating furnace wall.

Further, the above-mentioned restraint can be performed by a restraint having a member partially having a different coefficient of thermal expansion. This restraint generates a restraining force applied to a split mold by utilizing the difference in thermal expansion between members having different coefficients of thermal expansion during heating, but the configuration for obtaining this effect is also limited to a specific one. Not something. For example, utilizing the fact that a member having a relatively large coefficient of thermal expansion expands more than other members when heated,
It is possible to use the fact that a member having a relatively small coefficient of thermal expansion has a smaller amount of elongation than other members when heated, or to combine them. In these, the restraining force may be obtained by directly applying the extension force to the split mold, but the restraining force may be generated by providing a motion transmitting mechanism such as an appropriate link mechanism. For example,
By using a bimetal that combines dissimilar materials and using a deformation of pie metal under high temperature to generate a tightening force, or by expanding or reducing the difference in elongation of dissimilar materials by leverage principle, more Examples thereof include a method of obtaining a large tightening stroke and a method of obtaining a larger contraction force, and a method of increasing a forming force and a tightening force at a high temperature by using a difference in a coefficient of linear expansion of a material.

That is, according to the restraining means of the present invention, the actuator is arranged on the outside of the heating furnace, and the actuator and the restraining means in the heating furnace are connected by the driving force transmitting member. Since the temperature is lower than that of the upper surface, cooling by natural convection is expected, and it can be arranged far from the heating furnace, the heat conduction to the actuator is reduced, and heat measures are not required or reduced. Also, regarding the split type restraint, if a restraint using the above-described difference in thermal expansion coefficient is used, the restraining force is not impaired at the time of heating, and rather a strong restraining force is obtained at the time of heating. Sufficient sealing properties can be obtained. If you want to carry out the workpiece further,
When the temperature of the restraint decreases, the restraining force decreases or is lost, so that the restraint can be easily removed.
Further, if the fluid is introduced by bringing the fluid introduction tube into contact with the introduction port of the mold in a pressed state, the sealing property of the introduction port can be reliably ensured by a simple structure, and as a result, the workpiece can be processed. Good and efficient molding is possible.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) A superplastic material (high ductility material) forming apparatus according to an embodiment of the present invention will be described below with reference to FIGS. A die set upper die 1 (hereinafter simply referred to as upper die 1) and a die set lower die 2 (hereinafter simply referred to as lower die 2) each including a molding die having a predetermined mold shape on the inner surface thereof and corresponding to the split die described above. 3. The upper mold 1 has a compressed air inlet (corresponding to a fluid inlet) 1a for introducing compressed air from outside, and the compressed air inlet 1a is formed in the upper mold 1. Compressed air introduction channel 1
b, the compressed air introduction passage 1b is opened on the lower surface of the upper wall of the upper mold 1 to introduce compressed air into the mold. Further, an air passage 2b is formed in the molding die of the lower mold 2 for removing air from the mold on the side where the superplastic material is pushed during molding, and the air passage 2b is formed at an end of the molding die. (Not shown). The air passage 2b
Is also used as a passage for introducing compressed air when knocking out the formed workpiece. The above-mentioned cart 3 is movably arranged on rollers 5 arranged side by side on the bed 4, and the cart 3 has a sprocket 7 a attached to an electric motor 6 with a speed reducer arranged at the end side of the bed 4.
A chain 8 wound around is fixed between the sprocket 7b and the sprocket 7b arranged on the starting end side of the bed 4, and the upper die 1 and the lower die 2 can be moved together with the cart 3 on the bed 4 by the electric motor 6. it can.

A roller conveyor 11 for charging a superplastic material 10 as a workpiece to the upper surface of the lower mold 2 is disposed at the starting end of the bed 4. A molded product obtained from the raw material 10 by introducing compressed air into the lower die 2 on one side beside the position where the upper die 1 and the lower die 2 stand by at the time of loading and unloading the raw material. A peeling compressed air introduction device 12 that peels 100 from the lower mold 2 is arranged, and on the other side, for transporting the molded article 100 peeled from the lower mold 2 and taken out of the mold to an appropriate position. Is movably arranged. In addition, an upper die 1 is provided below the standby position.
A lifting device 14 that lifts the mold 10 to a predetermined height is provided, and a gap is formed between the upper mold 1 and the lower mold 2 by the lifting, and the material 10 or the molded product 100 is taken out through the gap.

Further, a heating furnace 15 having a heating element 15a is disposed on the end side of the bed 4, and an opening / closing door 16 is provided at the starting end of the heating furnace 15. The upper mold 1 and the lower mold 2 are carried in and out together with the carriage 3 through On the other hand, a compressed air introduction pipe 18 (corresponding to a fluid introduction pipe) made of a steel pipe penetrates the end wall of the heating furnace 15 so as to be movable in the longitudinal direction.
Is connected to a compressed air supply source 18c outside the heating furnace 15 by a flexible hose 18b, and is fixed to an air introduction pipe moving device 19 at a base end.
Further, a copper nozzle 18a is provided at a distal end portion of the compressed air introduction pipe 18, and the nozzle 18a is brought into metallic contact with a compressed air introduction port 1a formed in the upper die 1 so as to communicate with each other. It is configured.

On both sides of the outside of the heating furnace 15, hydraulic cylinders 20.
Is fixed. Each cylinder 20 is arranged so that the cylinder rod 20a faces upward, and the lower end is fixed to the bed 4. Further, levers 21 are disposed at substantially the same height as the upper end of the cylinder rod 20a and inside each hydraulic cylinder 20 as driving force transmitting members, respectively. The shaft is fixed to a lever support member 22 installed between the cylinder 20 and the outer wall surface of the heating furnace 15, and the outer end is fixed to the tip of the cylinder rod 20a. The inner side of the lever 21 penetrates the wall of the heating furnace 15 and reaches the inside of the heating furnace 15, and the inner end of the lever 21 is assigned to the upper die pressing portion 21a as a restraining means. As in this embodiment, the restraining means does not necessarily need to be separate from the driving force transmitting member, and may utilize a part of the driving force transmitting member or may be integrated with the driving force transmitting member. It may be. The upper die pressing portion 21a is located on the upper surface of the upper die 1. When the cylinder rod 20a is contracted, the upper die pressing portion 21a is separated from the upper surface of the upper die 1 and when the cylinder rod 20a is extended, the upper die is pressed. 1
And presses the upper surface of the upper die 1.

Next, a method of using the above molding apparatus will be described. Prior to charging the material 10 into the mold, the upper mold 1 and the lower mold 2 are overlapped, and these are moved together with the truck 3 into the heating furnace 15 in which the opening / closing door 16 is opened by the electric motor 6 with a speed reducer.
The door 16 is closed and heated to the molding temperature. afterwards,
By opening the door 16, the truck 3, the upper mold 1 and the lower mold 2 are moved to the material charging position by the motor 6 with a reduction gear, and only the upper mold 1 and the lower mold 1 are lifted by the lifting device 14. 2 and a gap is secured between them.

On the other hand, a superplastic material 10 is cut out so as to be compatible with the upper mold 1 and the lower mold 2, and is moved by a roller conveyor 11 so as to be interposed between the upper mold 1 and the lower mold 2. It is charged and placed on the upper surface of the lower mold 2. After the installation, the upper die 1 lifted by the lifting device 14 is lowered and put on the peripheral portion of the superplastic material 10 by its own weight, and the superplastic material 10
Is sandwiched and fixed between the upper mold 1 and the lower mold 2. Thereafter, the upper mold 1 and the lower mold 2 sandwiching the superplastic material 10 are again moved together with the carriage 3 into the heating furnace 15 by the electric motor 6 with a speed reducer and stopped at a predetermined position. At this time, the cylinder rod 20a has sufficiently contracted,
The upper die pressing portion 21a of the lever 21 is located on the upper surface of the upper die 1 so as to have a gap. Then, the hydraulic cylinder 20
Is actuated to extend the cylinder rod 20a, the lever 21 rotates about the shaft stopper on the lever support member 22 as a fulcrum, and the upper die pressing portion 21a at the tip rotates downward to form the upper die 1. The upper mold 1 and the lower mold 2 are firmly restrained by this. At the time of the above restraint, the lever 21 applies the pressing force of the hydraulic cylinder 20 to the upper mold 1, but the high temperature in the heating furnace 15 hardly transmits to the hydraulic cylinder 20, and therefore, the hydraulic cylinder 20 is protected from high heat. Can be. Note that the above-described restraint was performed immediately after the upper mold 1 and the lower mold 2 were moved into the heating furnace 15, but the restraint operation may be performed during or after holding, which will be described later.

Further, the upper mold 1 and the lower mold 2 are held in the heating furnace 15 for a certain time, and the upper mold 1, the lower mold 2 and the material 10 sandwiched therebetween are heated to a predetermined molding temperature by heat transfer. Heat. When the temperature reaches this temperature, the compressed air introduction pipe 18 penetrating through the wall of the heating furnace 15 is strongly pressed by the moving device 19 against the compressed air introduction port 1a of the upper die 1, and the compressed air introduction pipe 18
The nozzle 18a at the tip and the compressed air inlet 1a are sealed by bringing them into metallic contact. Thereafter, when compressed air is introduced into the upper mold 1 from the compressed air supply source 18c through the hose 18b and the compressed air introduction pipe 18, a large air pressure is applied to the upper surface of the material 10 through the compressed air introduction port 1a and the compressed air introduction path 1b. It is added to the space between the mold 1 and the inner surface. As a result, the material 10 is swelled downward by the air pressure and pressed against the lower mold 2, while the air below the material 10 is exhausted by the air passage 2 b, and finally, the material 10 is It is molded so as to follow the engraving surface of the nesting mold. During the introduction of the compressed air, the material 10 is sandwiched between the upper mold 1 and the lower mold 2 and the upper mold 1 and the lower mold 2 are restrained by the upper mold pressing portion 21a. Therefore, the molds are securely sealed from beginning to end, and the compressed air required for molding does not leak from the mating portions of the molds. Thereby, the deforming force due to the compressed air is reliably applied to the raw material 10, and the raw material 10 is formed well.

After the molding is completed, when the hydraulic cylinder 20 is operated in the reverse direction to contract the cylinder rod 20a, the upper die pressing portion 21a of the lever 21 separates from the upper die 1 and the upper die 1
And the constraint between the lower mold 2 is released. Further, the air introducing pipe 18 is also retracted by the moving device 19 and separated from the upper mold 1.
Thereafter, the upper mold 1, the lower mold 2, and the carriage 3 are taken out of the heating furnace 15 by the electric motor 6, and are moved to an initial charging position. Thereafter, the upper die 1 is lifted upward by the lifting device 14, and then the peeling compressed air introducing device 12 is moved to the lower die 2.
And pressurized air is introduced into the lower mold 2 through the air passage 2b to separate the molded article 100 from the lower mold 2. In addition, the said air introduction apparatus 12 for peeling
Has the same equipment as the compressed air introduction pipe 18 and the nozzle 18a, and this nozzle is brought into metal contact with the air introduction port of the lower die 2. Molded product 100 peeled from lower mold 2
Is further lifted up by a knockout device (not shown), taken out from between the upper mold 1 and the lower mold 2, and conveyed to a desired place by the molded article conveying device 13. By a series of these operations, a molded article that is well molded can be obtained.

In the above embodiment, the upper mold 1 and the lower mold 2 of the split mold are moved together inside and outside the heating furnace 15. However, since the purpose is to move the material 10 or the molded article 100, Only the lower mold 2 that accommodates them is moved, and the upper mold 1 is moved.
May stand by in the heating furnace 15 and only rise and fall. The raising or lowering of the upper die 1 can be performed by installing the lifting device 14 below the heating furnace 15. However, the raising or lowering of the upper die 1 is performed by using the driving force for the restraining means described above. It is also possible to carry out. FIG. 7 shows a structure using the driving force of the restraining means. A lever 211 having a modified shape of the lever 21 is disposed on the upper mold 1, and the end of the lever 211 is provided on the upper surface of the upper mold 1. A hook 24 is provided for the part. When the upper mold 1 is held down and restrained by the lever 211, the hook 24 and the lever 211 are in a non-contact state and have no effect.
When the lever 1 is rotated, the upper surface of the tip of the lever 211 is hooked on the hook 24, and the hook 24, that is, the upper mold 1 is lifted. When lowering the upper die 1, if the lever 211 is rotated so that the tip is lowered, the upper die 1 is lowered by its own weight, so that the upper die is lifted by using a part of the restraining means. , Descending can be performed.

Further, since the high ductility characteristics of the work material largely depend on the processing temperature, it is important to maintain the temperature of the split mold and the work material in appropriate ranges. In the above embodiment, since the entire split mold or only the lower mold is moved into and out of the heating furnace 15, the heat loss of the mold is large, and the heating load on the heating furnace 15 must be increased. Therefore, a heat insulating material that can be attached to and detached from the side wall of the split mold and that can move together with the split mold is arranged outside the heating furnace, so that the mold side is covered only outside the heating furnace and the cover is removed inside the heating furnace. If possible, outside the heating furnace, radiant heat radiation and convective heat radiation from the side surface of the mold covered by the heat insulating material can be suppressed to reduce the temperature drop of the mold. In addition, when the mold is placed in the heating furnace, the heat insulating material on the side of the mold can be removed and left outside the heating furnace, so that the side of the mold is directly exposed to the heating element in the heating furnace, and thus has a large heat transfer coefficient. And the amount of heat received from the heating element can be increased. As a result, the heat loss of the mold is minimized and the temperature recovery time is minimized,
High productivity can be obtained by reducing the amount of operating heat.

The apparatus shown in FIGS. 8 and 9 has a flat U-shaped heat insulating material 25 movably disposed on the bed 4 so that the open side faces the heating furnace. The heat insulating material 25 has a lower end. The portion is accommodated in a guide groove 4a formed in the bed 4, and moves while being guided by the guide groove 4a. In addition, a wire 26 is connected to the heat insulating material 25, and
A winding device 27 that winds the wire 26 and moves the wire 26 toward the heating furnace is provided. When the lower mold 2 or the lower mold 2 and the upper mold 1 are moved out of the heating furnace 15, if the wire 26 in the winding device 27 is freely movable, the front surface of the mold hits the heat insulating material 25. The heat-insulating material 25 is pressed by the force of the mold, and moves to the above-described charging position together with the mold while being positioned on the front and side surfaces of the mold. When these molds are stored in the heating furnace 15, the wire 26 is moved by the winding device 27 so as to follow the mold while being wound. Thereby, the heat insulating material is always located on the side surface of the mold until the mold moves into the heating furnace 15. When the mold enters the heating furnace 15 exactly, the winding device 2
The winding of the wire 26 is stopped by 7 and the heat insulating material 25 is stopped, and the apparatus waits at that position and waits for the mold to move out of the heating furnace 15 again. Due to the above, the mold can minimize heat loss outside the heating furnace by disposing the heat insulating material to the side while moving, while the heat insulating material is removed inside the heating furnace and directly heated. It is heated efficiently by being exposed. This greatly improves the thermal efficiency during the molding process.

(Embodiment 2) Next, an embodiment of a restraint used in a high ductility material molding apparatus will be described with reference to FIGS. The upper die, lower die, and workpiece (superplastic material) to be restrained in this embodiment are the same as those in the above embodiment, and are denoted by the same reference numerals as those described above, and description thereof will be omitted. I do. In this embodiment, a connection bolt 30 is planted upward at an edge of the lower mold 2, and the connection bolt 30 is formed along the edge of the upper mold 1 sandwiching the peripheral edge of the material 10 together with the lower mold 2. It extends further upward through the part. Further, the connecting bolt 30 has a cylindrical body 31 having a larger thermal expansion coefficient than the connecting bolt 30 on the upper die 1.
Is inserted. The lower end of the cylindrical body 31 is in contact with the upper surface of the edge of the upper die 1, and the connecting bolt 30
Has an upper end projecting further. A washer 32 is fitted into the upper end of the connecting bolt 30 protruding from the cylindrical body 31, and a nut 33 is further tightened on the upper end side of the connecting bolt 30. The connecting bolt 30, the cylindrical body 31, the washer 32,
Upper mold 1 and lower mold 2 by split mold restraint consisting of nut 33
Are restrained with the material 10 sandwiched therebetween.

The upper mold 1, the lower mold 2, and the
When the material 10 is heated in a heating furnace or the like, the upper mold 1, the lower mold 2,
As the temperature of the material 10 increases, the temperature of the restraint also increases. At this time, since the tubular body 31 has a larger coefficient of thermal expansion than the connecting bolt 30, the action of extending between the washer 32 and the upper mold 1 acts to prevent the nut 33 from loosening and to move the upper mold 1 further downward. The material 10 sandwiched between the upper mold 1 and the lower mold 2 is more strongly pressed, and the sealing of the mating portion between the upper mold 1 and the lower mold 2 is further ensured. When a fluid is introduced into the mold, the fluid pressure is reliably transmitted to the material 10, and as a result,
A good molded article 100 is obtained. Thereafter, when the temperature of the mold is lowered after the molding, the temperature of the restraint is also lowered, so that the restraining force is weakened. Therefore, the nut 33 can be easily loosened to release the restraint between the molds.

(Embodiment 3) Another embodiment of the restraint will be described with reference to FIG. The restraint device of this embodiment has a restraint body 40 having a C-shaped cross section, and a plate material 41 having a larger thermal expansion coefficient than the restraint body 40 is attached to the back side of the restraint side, and the connecting portion is bimetallic. Is composed. When using the above restraint,
The upper die 1 and the lower die 2 sandwiching the material 10 are housed, and the female bolt 40a formed on the upper side of the opening is screwed with the restraining bolt 42 so as to protrude downward from the opening and pressed on the upper surface of the upper die 1. Hit it. The upper mold 1 and the lower mold 2 are restrained by the restraining bolts 42 and the lower side of the opening. When the upper mold 1 and the lower mold 2 to which the restraint is attached are heated together with the raw material 10, the plate 41 of the restraint is preferentially elongated due to a difference in thermal expansion coefficient, and the connecting portion is curved toward the opening, and as a result, Restraint bolt 42
And the tightening force by the lower part of the opening increases the binding force.

(Embodiment 4) Another embodiment of the restraint will be described with reference to FIG. The restraining device of this embodiment has two holding pieces 50 and 51 for holding the edges of the upper mold 1 and the lower mold 2 at their respective tips, and two rear pieces on the rear sides of the holding pieces 50 and 51 respectively. The connecting rods 52 and 53 are axially fixed so as to be arranged side by side. The connecting rod 53 is made of a material having a relatively large thermal expansion coefficient with respect to the connecting rod 52. Also,
A female screw portion 50a is formed in the holding piece 50, and a restraining bolt 54 is screwed into the female screw portion 50a, and the restraining bolt 54 projecting below the holding piece 50 is pressed against the upper surface of the upper mold 1, Upper mold 1 and lower mold 2 together with holding piece 51
And restrain. Upper die 1 and lower die 2 with the above restraint attached
When the material is heated together with the material 10, the temperature of the restraint also rises, so that the connecting rod 53 expands more than the connecting rod 52 due to a difference in thermal expansion coefficient. As a result, the holding pieces 50 and 51 rotate in a direction in which the tip sides approach each other with the shaft stop portion with the connecting rod 52 as a fulcrum, and as a result, the force for restraining the upper mold 1 and the lower mold 2 increases.

[0028]

As described above, according to the high ductility forming apparatus of the present invention, the actuator disposed on the outer side of the heating furnace and the split portion of the split mold located in the heating furnace are restrained. Since the split mold restraining means and the driving force transmitting member for connecting the actuator and the split mold restraining means and transmitting the driving force of the actuator to the split mold restraining means are provided, a strong restraining force of the split mold is secured. Thus, the temperature rise of the actuator can be suppressed.

Further, if a heat insulating material detachable from the side wall of the split mold and movable with the split mold is disposed outside the heating furnace, the heat loss in the split mold is reduced, and the production efficiency is improved. Further, a pressurized fluid introduction port is formed in the split mold, and a fluid introduction pipe communicating with the introduction port is disposed so as to be able to move away from and close to the introduction port, and the fluid introduction pipe is separated from the introduction port. If an introduction pipe moving device is provided that allows the fluid introduction pipe to come into contact with the introduction port and further press the fluid introduction pipe toward the introduction port side, the sealability of the introduction port can be reliably ensured by a simple structure. As a result, the workpiece can be formed well and efficiently.

Further, the split mold restraint has a member having a different coefficient of thermal expansion in a part thereof and a restraining force applied to the split mold by utilizing a difference in thermal expansion between members having different coefficients of thermal expansion during heating. Is generated, the binding force can be further increased by a simple structure.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a high ductility forming apparatus of the present invention.

FIG. 2 is a partially enlarged plan view in which a part is similarly sectioned.

FIG. 3 is a front view in which a part is similarly sectioned.

FIG. 4 is a partially enlarged front sectional view of the same.

FIG. 5 is an enlarged view of a pressed portion between the compressed air introduction pipe and the upper compressed air introduction port.

FIG. 6 is a side view of the heating furnace with a partial cross section.

FIG. 7 is a partial side view showing the operation of a modification of the restraint means.

FIG. 8 is a partial plan view showing a modification in which a heat insulating material is similarly arranged.

FIG. 9 is a partial side sectional view of the same.

FIG. 10 is a cross-sectional view illustrating a use state of the restraint device according to the embodiment of the present invention.

FIG. 11 is a partially enlarged sectional view of the same.

FIG. 12 is a partially enlarged view showing a use state of a restraint device according to another embodiment.

FIG. 13 is a partially enlarged view showing a use state of a restraint device according to still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper mold 1a Compressed air introduction port 1b Compressed air introduction path 2 Lower mold 2b Air passage 3 Truck 5 Roller 6 Electric motor with reduction gear 8 Chain 10 Superplastic material 12 Knockout device 14 Push-up device 15 Heating furnace 16 Opening door 18 Compressed air Introduction pipe 18a Compressed air introduction nozzle 18c Compressed air supply source 19 Air introduction pipe moving device 20 Hydraulic cylinder 21 Lever 211 Lever 21a Upper die pressing part 25 Insulation material 30 Connecting bolt 31 Cylindrical body 33 Nut 40 Restrainer body 41 Plate material 42 Restraining bolt Reference Signs List 50 holding piece 51 holding piece 52 connecting rod 53 connecting rod 54 restraining bolt

Continuation of front page (72) Inventor Shinichi Ono 4 Chazu-cho, Muroran-shi, Hokkaido Inside Japan Steel Works, Ltd.

Claims (3)

[Claims] 1. A split mold in which a work material is disposed is heated in a heating furnace, and a fluid pressure is applied to the work material in the split mold to deform the highly ductile work material by the pressure. A high ductility material forming apparatus, wherein an actuator disposed on the outside of the heating furnace, split mold restraining means positioned in the heating furnace to restrain a mating portion of the split mold, and the actuator and the split mold restraining means And a driving force transmitting member for transmitting the driving force of the actuator to the split mold restraining means by coupling 2. A part having members having different coefficients of thermal expansion and generating a restraining force applied to a split mold by utilizing a difference in thermal expansion between members having different coefficients of thermal expansion during heating. Mold restraint for high ductility material molding equipment 3. A split mold in which a work material is disposed is heated in a heating furnace, and a fluid pressure is applied to the work material in the split mold to deform the highly ductile work material by the pressure. In the high ductility material molding apparatus to be formed, a pressurized fluid introduction port is formed in the split mold, and a fluid introduction pipe communicating with the introduction port is disposed so as to be able to move away from and to the introduction port. A high ductility material characterized by being provided with an introduction pipe moving device for moving the fluid introduction pipe toward and away from the introduction port and pressing the fluid introduction pipe further toward the introduction port after the fluid introduction pipe comes into contact with the introduction port. Molding equipment