JP6834014B2 - Stretch molding equipment and stretch molding method - Google Patents

Description

The present invention relates to a stretch molding apparatus and a stretch molding method.

Aircraft parts such as the fuselage and main wings of an aircraft are composed of structural members such as plate-shaped skins, long frames and stringers. Since the fuselage and main wings have a curved surface shape, the frame and stringer have a curved shape curved along the longitudinal direction.

In order to give a curved shape to a long material made of an aluminum alloy, a material (also referred to as an O material) that has been annealed (annealed) by a roll forming apparatus is conventionally roll-formed to obtain an O material. It has an approximate shape. Then, the O material obtained by roll molding is subjected to a solution treatment to obtain a W material.

In this case, while pulling both ends of the long material of the W material, the mold is applied to the long material, and stretch molding is performed to further impart a curved shape to the W material. As a result, the long material is given a shape required as a product or a curvature close to it.

In Patent Document 1 below, in a molding apparatus that performs stretch molding, a molding surface is formed by a plurality of blocks, and the position of each block is individually moved in the molding direction so that the shape of the molding surface can be changed. , It is disclosed that good stretch molding is performed without relative movement with respect to a long material during molding.

Japanese Unexamined Patent Publication No. 2006-231380

When stretch molding is performed, in the vicinity of both ends of the long material to be molded, the long material is easily deformed and stretched by the action of a tensile force. On the other hand, in the central portion in contact with the mold, the long material has a reduced tensile force due to the influence of friction and the like acting on the long material, and the amount of deformation is small and it is difficult to stretch.

As a result of stretch molding, the residual stress introduced in processes such as roll molding and solution treatment before stretch molding is reduced, but since the amount of deformation in the central part is small, the residual stress in the central part is smaller than that in the end part. It is difficult to reduce. Therefore, when cutting processing such as etching or drilling is performed after stretch molding, there is a problem that the shape changes for each material and variation is likely to occur.

The present invention has been made in view of such circumstances, and is a stretch molding apparatus and stretch molding capable of reducing a bias in the amount of deformation of the central portion and the end portion of a long material to be molded. The purpose is to provide a method.

In order to solve the above problems, the stretch molding apparatus and the stretch molding method of the present invention employ the following means.
That is, the stretch molding apparatus according to the first aspect of the present invention includes a mold and grips for gripping both ends of a long material to be molded, and the cross-sectional shape of the mold is the shape of the molding surface. The molding surface of the mold has a curved shape with a bulging central side, and is formed so as to give a curved shape to the material to be molded, and has a length along the longitudinal direction of the material to be molded. Is shorter than the molding surface and has a second molding surface along the molding surface. A second mold is removably installed at the center of the molding surface, and the second mold is installed on the molding surface. When this is done, the first mode in which only the second mold presses the material to be molded while applying a tensile force to the material to be molded by the grip portion, and the second mold is the molding surface. It has a second mode in which the first mold presses the material to be molded while applying a tensile force to the material to be molded by the grip portion when the mold is removed from the mold.

In order to solve the above problems, the stretch molding apparatus and the stretch molding method of the present invention employ the following means.
That is, the stretch molding apparatus according to the first aspect of the present invention includes a first mold and grip portions for gripping both ends of a long material to be molded, and the cross-sectional shape of the first mold is , The central side of the molding surface has a bulging curved shape, and the molding surface of the first mold is formed so as to give a curved shape to the material to be molded, and the length of the material to be molded. A second mold having a length along the direction shorter than the molding surface and having a second molding surface along the molding surface is removably installed in the center of the molding surface, and the second mold is provided. Is installed on the molding surface, the first mode in which only the second mold presses the material to be molded while applying a tensile force to the material to be molded by the grip portion, and the second mode. When the mold is removed from the molding surface, the first mold has a second mode of pressing the material to be molded while applying a tensile force to the material to be molded by the grip portion.

The stretch molding apparatus according to the third aspect of the present invention includes a mold and grip portions for gripping both ends of a long material to be molded, and the cross-sectional shape of the mold is such that the center side of the molding surface is The molding surface of the mold has a bulging curved shape, and is formed so as to impart a curved shape to the material to be molded, and the grip portion exerts a tensile force on the material to be molded. In the first mode in which only the central portion of the molding surface of the mold presses the material to be molded, and while applying a tensile force to the material to be molded by the grip portion, the mold The entire surface of the molding surface has a second mode in which the material to be molded is pressed against the material to be molded.

The stretch molding method according to the fourth aspect of the present invention includes a first mold and grip portions for gripping both ends of a long material to be molded, and the cross-sectional shape of the first mold is formed. The molding surface of the first mold has a curved shape in which the central side of the surface is bulged, and is a stretch molding method using a stretch molding device formed so as to impart a curved shape to the material to be molded. A step of installing a second mold having a length along the longitudinal direction of the material to be molded shorter than the molding surface and having a second molding surface along the molding surface at the center of the molding surface. When the second mold is installed on the molding surface, a step in which only the second mold presses the material to be molded while applying a tensile force to the material to be molded by the grip portion. When the second mold is removed from the molding surface, the first mold presses the material to be molded while applying a tensile force to the material to be molded by the grip portion. Have.

The stretch molding method according to the fifth aspect of the present invention includes a mold and grip portions for gripping both ends of the long material to be molded, and the mold is in the longitudinal direction of the material to be molded. It is a stretch molding method using a stretch molding apparatus having a plurality of split dies that are divided into a plurality of dies and can individually change their positions with respect to the material to be molded, and is installed in the central portion of the plurality of split dies. The step of arranging the split die so as to project toward the material to be molded from the split die installed at the end, and the gripping portion while applying a tensile force to the material to be molded. The step in which only the split die arranged in the central portion presses the material to be molded, and the plurality of split dies arranged in the central portion and the end portion have a curved shape with respect to the material to be molded. The plurality of divided dies arranged at the central portion and the end portion while applying a tensile force to the material to be molded by the grip portion when the material to be molded is applied. Has a step of pressing.

The stretch molding method according to the sixth aspect of the present invention includes a mold and grip portions for gripping both ends of a long material to be molded, and the cross-sectional shape of the mold is such that the center side of the molding surface is The molding surface of the mold having a bulging curved shape is a stretch molding method using a stretch molding device formed so as to impart a curved shape to the material to be molded, and is formed by the grip portion. While applying a tensile force to the material to be molded, a step of pressing the material to be molded only by the central portion of the molding surface of the mold and a gripping portion exerting a tensile force on the material to be molded. While applying, the entire surface of the molding surface of the mold has a step of pressing the material to be molded.

According to the present invention, it is possible to reduce the deviation of the amount of deformation between the central portion and the end portion of the elongated material to be molded, and the residual stress is reduced in the vicinity of the central portion as well as the end portion. As a result, when cutting processing such as etching or drilling is performed after stretch molding, it is possible to reduce the shape change that occurs in the material and the variation among the materials.

It is a schematic block diagram which shows the stretch molding apparatus which concerns on 1st Embodiment of this invention. It is a schematic block diagram which shows the stretch molding apparatus which concerns on 1st Embodiment of this invention. It is a schematic block diagram which shows the stretch molding apparatus which concerns on 2nd Embodiment of this invention. It is a schematic block diagram which shows the stretch molding apparatus which concerns on 2nd Embodiment of this invention. It is a schematic block diagram which shows the modification of the stretch molding apparatus which concerns on 2nd Embodiment of this invention. It is a schematic block diagram which shows the stretch molding apparatus which concerns on 3rd Embodiment of this invention.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
[First Embodiment]
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
The stretch molding apparatus 1 according to the present embodiment is an apparatus that stretch-molds a long material 20 which is a material to be molded by a mold 2. The elongated material 20 is made of, for example, an aluminum alloy, and is a material manufactured as a structural member such as a frame and a stringer constituting aircraft parts such as an aircraft fuselage and main wings.

The elongated material 20 is a material (W) in which an annealed (annealed) material (O material) is roll-molded, and the O material obtained by the roll molding is solution-treated. Material). Alternatively, the elongated material 20 may be a material obtained by subjecting the annealed material (O material) to a solution treatment and performing roll molding on the W material.

In stretch molding, the gripping portions 3 grip both ends of the elongated material 20 and press the elongated material 20 against the mold 2 (or the mold 2 against the elongated material 20) while applying a pulling force. Press). Then, in the stretch molding, the elongated material 20 formed into a curved shape by the roll molding is plastically deformed to further impart the curved shape.

The stretch molding apparatus 1 includes a mold 2, a grip portion 3, a moving portion 4, an operating portion 5, and the like.
The mold 2 has a long molding surface 6 along the longitudinal direction of the long material 20 which is a material to be molded. The molding surface 6 of the mold 2 is formed so as to give a curved shape to the elongated material 20, and has a curved surface. The cross-sectional shape of the mold 2 is a curved shape in which the central side of the molding surface 6 is bulged, and is, for example, a part of an arc or an ellipse.

The grip portion 3 is configured to grip the end portion of the elongated material 20. One grip portion 3 is installed at each end of the elongated material 20. The grip portion 3 is connected to the moving portion 4 and can be moved by the moving portion 4.

A second mold 7 is detachably installed at the center of the molding surface 6 of the mold 2 according to the present embodiment. The second mold 7 has a length of the elongated material 20 along the longitudinal direction is shorter than that of the molding surface 6, and has a second molding surface 8 along the molding surface 6. The second molding surface 8 has, for example, a curved surface parallel to the molding surface 6 of the mold 2. The length of the second mold 7 is about 1/4 to 1/3 of the length of the mold 2.

When the moving portion 4 moves the grip portion 3 to move the elongated material 20 gripped by the grip portion 3 toward the molding surface 6 side of the mold 2, and the second mold 7 is not installed. , The long material 20 is pressed against the molding surface 6 of the mold 2, or when the second mold 7 is installed, it is pressed against the second molding surface 8 of the second mold 7. Further, the moving portion 4 is pressed against the molding surface 6 of the mold 2 or the second molding surface 8 of the second mold 7 by moving the grip portion 3 outward in the longitudinal direction of the elongated material 20. A tensile force is applied to the elongated material 20.

The operation unit 5 receives an input operation from the operator and transmits an operation signal to the moving unit 4.

In the above description, the moving portion 4 moves the grip portion 3 to move the elongated material 20 gripped by the grip portion 3 toward the molding surface 6 side of the mold 2. The invention is not limited to this example, and the mold 2 may be moved to the long material 20 side by a moving portion (not shown) for moving the mold 2.

In the stretch molding method using the stretch molding apparatus 1 according to the present embodiment, first, as shown in FIG. 1, the second mold 7 is installed on the molding surface 6 of the mold 2. Then, the elongated material 20 gripped by the grip portion 3 is moved, and the elongated material 20 is pressed against the second molding surface 8 of the second mold 7. Further, the moving portion 4 pulls the long material 20 pressed against the second molding surface 8 of the second mold 7 by moving the grip portion 3 outward in the longitudinal direction of the long material 20. Apply force (first mode). At this time, the elongated material 20 is prevented from coming into contact with the molding surface 6 of the mold 2.

As a result, the contact area between the long material 20 and the second mold 7 is smaller than the contact area between the long material 20 and the mold 2 when the second mold 7 is not installed. When a tensile force is applied to the elliptical material 20, the frictional force acting on the vicinity of the central portion of the elongated material 20 is reduced, and the tensile force transmitted to the vicinity of the central portion is increased. As a result, the amount of deformation generated in the vicinity of the central portion of the elongated material 20 increases.

Next, when it is confirmed that a predetermined deformation amount has been applied based on the movement amount in the pulling direction detected in the moving portion 4, the movement of the moving portion 4 is stopped and the moving portion 4 is moved with respect to the elongated material 20. Stop applying tensile force. Then, the elongated material 20 gripped by the grip portion 3 is moved to separate the elongated material 20 from the second molding surface 8, and the second mold 7 is removed from the molding surface 6.

After that, the elongated material 20 gripped by the grip portion 3 is moved, and as shown in FIG. 2, the elongated material 20 is pressed against the molding surface 6 of the mold 2. Further, the moving portion 4 applies a tensile force to the elongated material 20 pressed against the molding surface 6 of the mold 2 by moving the grip portion 3 outward in the longitudinal direction of the elongated material 20. (Second mode). Next, when it is confirmed that a predetermined deformation amount has been applied based on the movement amount in the pulling direction detected in the moving portion 4, the movement of the moving portion 4 is stopped and the moving portion 4 is moved with respect to the elongated material 20. Stop applying tensile force. Then, the elongated material 20 gripped by the grip portion 3 is moved to separate the elongated material 20 from the molding surface 6.

As a result, the elongated material 20 is plastically deformed along the molding surface 6 of the mold 2, and a curved shape is given to the elongated material 20.

Conventionally, from the start of stretch molding, the long material 20 is pressed against the molding surface 6 of the mold 2 to give a curved shape, but in the present embodiment, the second metal having a small contact area is first formed. The elongated material 20 is pressed against the second forming surface 8 of the mold 7 to reduce the frictional force acting on the vicinity of the central portion of the elongated material 20 and increase the tensile force transmitted to the vicinity of the central portion. The amount of deformation generated in the vicinity of the central portion of the scale-shaped material 20 is increased. Then, the elongated material 20 to which the amount of deformation is increased as compared with the conventional one is stretch-molded again by the mold 2.

By performing the stretch molding in two stages in this way, the residual stress in the vicinity of the central portion of the elongated material 20 can be reduced. As a result, it is possible to reduce the shape change that occurs when cutting processing such as etching or drilling is performed after stretch molding, and the variation for each material after cutting processing. Further, since the existing mold 2 can be utilized, it is not necessary to newly manufacture the mold.

[Second Embodiment]
Next, the second embodiment of the present invention will be described with reference to FIGS. 3 and 4. The detailed description of the configuration and operation overlapping with the first embodiment will be omitted.

Unlike the first embodiment, the mold 2 according to the present embodiment has a plurality of divided molds 10. That is, the mold 2 is divided into a plurality of parts in the longitudinal direction of the elongated material 20 which is the material to be molded. Then, the positions of the plurality of split dies 10 can be individually changed with respect to the elongated material 20 side.

The contact portion of each of the split dies 10 with the elongated material 20 has a curved surface as shown in FIGS. 3 and 4.

In the present embodiment, a moving portion 11 for moving the split mold 10 is further provided. As shown in FIG. 3, it is also possible to arrange each of the divided dies 10 by changing the position of each of the divided dies 10 by the moving unit 11 (first mode). That is, as in the state where the second mold 7 is installed on the molding surface 6 of the mold 2 of the first embodiment, the split mold 10 installed in the central portion of the plurality of split molds 10 has an end portion. It can be arranged so as to project toward the elongated material 20 side from the divided mold 10 arranged in. The length of the central portion from which the split mold 10 is projected is about 1/4 to 1/3 of the total length of the mold 2.

Further, by changing the position of each of the divided dies 10 by the moving portion 11, as shown in FIG. 4, a plurality of divided dies 10 can be arranged in a curved shape in which the central side is bulged (second mode). As a result, a plurality of divided molds 10 can impart a curved shape to the elongated material 20 as in the molding surface 6 of the mold 2 of the first embodiment.

The first mode and the second mode can be switched by adjusting the arrangement position of each of the split dies 10 by the moving unit 11. The switching between the first mode and the second mode may be performed manually by the operator, or the deformation amount of the elongated material 20 is detected, and it is confirmed that the predetermined deformation amount is applied. At that time, the control device may perform the transition from the first mode to the second mode.

As shown in FIGS. 3 and 4, the split mold 10 may be divided into two or more at the central portion and the end portion to form a fine curved shape, and is shown in FIG. As described above, the number of the split molds 10 may be three, one at the central portion and one at the end portion. In addition, a combination of both is possible.

In the stretch molding method using the stretch molding apparatus 1 according to the present embodiment, first, as shown in FIG. 3, the split dies 10 installed in the central portion of the plurality of split dies 10 are arranged at the end portions. It is arranged so as to project toward the elongated material 20 side from the divided mold 10. Then, the elongated material 20 gripped by the grip portion 3 is moved, and the elongated material 20 is pressed against the split mold 10 which is arranged so as to project at the central portion. Further, the moving portion 4 applies a tensile force to the elongated material 20 pressed against the split mold 10 by moving the grip portion 3 outward in the longitudinal direction of the elongated material 20 (first). mode). At this time, the elongated material 20 is prevented from coming into contact with the split mold 10 arranged at the end portion.

As a result, the contact area between the long material 20 and the split mold 10 is smaller than the contact area between the long material 20 and the mold 2 when all the split molds 10 are pressed, so that the long shape When a tensile force is applied to the material 20, the frictional force acting on the vicinity of the central portion of the elongated material 20 is reduced, and the tensile force transmitted to the vicinity of the central portion is increased. As a result, the amount of deformation generated in the vicinity of the central portion of the elongated material 20 increases.

Next, when it is confirmed that a predetermined deformation amount has been applied based on the movement amount in the pulling direction detected in the moving portion 4, the movement of the moving portion 4 is stopped and the moving portion 4 is moved with respect to the elongated material 20. Stop applying tensile force. Then, each of the divided dies 10 is moved, and a plurality of divided dies 10 are arranged in the curved shape whose center side is bulged so that the long material 20 can be given a curved shape (see FIG. 4).

After that, the moving portion 4 again moves the grip portion 3 outward in the longitudinal direction of the elongated material 20 to apply a tensile force to the elongated material 20 pressed against the split mold 10 (the first). 2 modes). Next, when it is confirmed that a predetermined deformation amount has been applied based on the movement amount in the pulling direction detected in the moving portion 4, the movement of the moving portion 4 is stopped and the moving portion 4 is moved with respect to the elongated material 20. Stop applying tensile force. Then, the long material 20 gripped by the grip portion 3 is moved to separate the long material 20 from the split mold 10.

As a result, the elongated material 20 is plastically deformed along the plurality of divided molds 10 of the mold 2, and a curved shape is given to the elongated material 20.

Conventionally, from the start of stretch molding, a curved shape is given to the elongated material 20 by pressing against all the plurality of divided dies 10, but in the present embodiment, the contact area is initially reduced. The long material 20 is pressed only against the split mold 10 in the central portion to reduce the frictional force acting on the vicinity of the central portion of the long material 20 and increase the tensile force transmitted to the vicinity of the central portion. The amount of deformation that occurs near the central portion of the elongated material 20 is increased. Then, the elongated material 20 to which the amount of deformation is increased as compared with the conventional one is stretch-molded again by the mold 2.

By performing the stretch molding in two stages in this way, the residual stress in the vicinity of the central portion of the elongated material 20 can be reduced. As a result, it is possible to reduce the shape change that occurs when cutting processing such as etching or drilling is performed after stretch molding, and the variation for each material after cutting processing. Further, unlike the first embodiment, the time required for removing the second mold 7 is not required, and the mold shape can be changed automatically by a machine instead of manually.

[Third Embodiment]
Next, the third embodiment of the present invention will be described with reference to FIG. The detailed description of the configuration and operation overlapping with the first embodiment will be omitted.

In the present embodiment, unlike the first embodiment, the second mold 7 is not installed on the molding surface 6 of the mold 2, and the stretch molding is performed in two stages using only the mold 2. That is, by adjusting the moving direction of the gripping portion 3 by the moving portion 4, as shown by the solid line portion of the elongated material 20 in FIG. 6, the elongated material 20 is pressed only against the central portion of the molding surface 6. As shown by the alternate long and short dash line portion of the elongated material 20 in FIG. 6, the elongated material 20 is pressed over the entire longitudinal direction of the molding surface 6 to form 2 as in the first and second embodiments. Stretch molding is performed on the elongated material 20 in stages.

By moving the grip portion 3, the moving portion 4 moves the elongated material 20 gripped by the grip portion 3 toward the molding surface 6 side of the mold 2, and molds the elongated material 20 into the mold 2. Press against surface 6. Further, the moving portion 4 applies a tensile force to the elongated material 20 pressed against the molding surface 6 of the mold 2 by moving the grip portion 3 outward in the longitudinal direction of the elongated material 20. ..

In the first mode, the moving portion 4 applies a tensile force to the elongated material 20 by moving the grip portion 3, and only the central portion of the molding surface 6 of the mold 2 is the elongated material 20. The grip portion 3 is moved so as to press the grip portion 3. In the second mode, the moving portion 4 applies a tensile force to the elongated material 20 by the grip portion 3 so that the entire surface of the molding surface 6 of the mold 2 presses the elongated material 20. The grip portion 3 is moved. In the first mode, the length of the central portion of the molding surface 6 to which the elongated material 20 is brought into contact is about 1/4 to 1/3 of the total length of the molding surface 6.

The first mode and the second mode can be switched by adjusting the moving direction of the gripping portion 3 by the moving portion 4. The switching between the first mode and the second mode may be performed manually by the operator, or the deformation amount of the elongated material 20 is detected, and it is confirmed that the predetermined deformation amount is applied. At that time, the control device may perform the transition from the first mode to the second mode.

In the stretch molding method using the stretch molding apparatus 1 according to the present embodiment, first, as shown by the solid line portion of the elongated material 20 in FIG. 6, only the central portion of the molding surface 6 of the mold 2 is elongated. The elongated material 20 gripped by the grip portion 3 is moved so as to press the material 20, and the elongated material 20 is pressed against the central portion of the molding surface 6 of the mold 2. Further, the moving portion 4 moves the grip portion 3 outward in the longitudinal direction of the elongated material 20 to pull the elongated material 20 pressed against the central portion of the molding surface 6 of the mold 2. (1st mode). At this time, the elongated material 20 is prevented from coming into contact with the ends of the mold 2 other than the central portion of the molding surface 6.

As a result, the contact area between the long material 20 and the mold 2 is smaller than the contact area when the entire surface of the long material 20 and the mold 2 are in contact with each other, so that the long material 20 has a tensile force. Is applied, the frictional force acting on the vicinity of the central portion of the elongated material 20 is reduced, and the tensile force transmitted to the central portion is increased. As a result, the amount of deformation generated in the vicinity of the central portion of the elongated material 20 increases.

Next, when it is confirmed that a predetermined deformation amount has been applied based on the movement amount in the pulling direction detected in the moving portion 4, the movement of the moving portion 4 is stopped and the moving portion 4 is moved with respect to the elongated material 20. Stop applying tensile force.

After that, the moving portion 4 is moved while the grip portion 3 grips the elongated material 20, and the elongated material 20 is transferred to the mold 2 as shown by the alternate long and short dash line portion of the elongated material 20 in FIG. Press against the entire surface of the molding surface 6. Further, the moving portion 4 moves the grip portion 3 outward in the longitudinal direction of the elongated material 20 to exert a tensile force on the elongated material 20 pressed against the entire surface of the molding surface 6 of the mold 2. Grant (second mode). Next, when it is confirmed that a predetermined deformation amount has been applied based on the movement amount in the pulling direction detected in the moving portion 4, the movement of the moving portion 4 is stopped and the moving portion 4 is moved with respect to the elongated material 20. Stop applying tensile force. Then, the elongated material 20 gripped by the grip portion 3 is moved to separate the elongated material 20 from the molding surface 6.

As a result, the elongated material 20 is plastically deformed along the entire surface of the molding surface 6 of the mold 2, and a curved shape is given to the elongated material 20.

Conventionally, from the start of stretch molding, the long material 20 is pressed against the entire surface of the molding surface 6 of the mold 2 to give a curved shape, but in the present embodiment, the gold having a small contact area is first formed. The elongated material 20 is pressed only against the central portion of the molding surface 6 of the mold 2, the frictional force acting on the vicinity of the central portion of the elongated material 20 is reduced, and the tensile force transmitted to the vicinity of the central portion is increased. , The amount of deformation generated in the vicinity of the central portion of the elongated material 20 is increased. Then, stretch molding is performed again on the entire surface of the molding surface 6 of the mold 2 with respect to the long material 20 to which the amount of deformation is increased as compared with the conventional case.

By performing the stretch molding in two stages in this way, the residual stress in the vicinity of the central portion of the elongated material 20 can be reduced. As a result, it is possible to reduce the shape change that occurs when cutting processing such as etching or drilling is performed after stretch molding, and the variation for each material after cutting processing. Further, since the existing mold 2 can be utilized, it is not necessary to newly manufacture the mold.

1: Stretch molding device 2: Mold 3: Grip part 4: Moving part 5: Operating part 6: Molding surface 7: Second mold 8: Second molding surface 10: Divided mold 11: Moving part 20: Long length Material

Claims (6)

1st mold and
A grip portion that grips both ends of the long material to be molded,
With
The cross-sectional shape of the first mold has a curved shape in which the central side of the molding surface bulges, and the molding surface of the first mold is formed so as to impart a curved shape to the material to be molded. And
A second mold having a length along the longitudinal direction of the material to be molded shorter than the molding surface and having a second molding surface along the molding surface is removably installed in the central portion of the molding surface. ,
When the second mold is installed on the molding surface, the first mode in which only the second mold presses the material to be molded while applying a tensile force to the material to be molded by the grip portion. When,
When the second mold is removed from the molding surface, a second mode in which the first mold presses the material to be molded while applying a tensile force to the material to be molded by the grip portion. Stretch molding equipment with. With the mold
A grip portion that grips both ends of the long material to be molded,
With
The mold is divided into a plurality of dies in the longitudinal direction of the material to be molded, and has a plurality of divided dies whose positions with respect to the material to be molded can be individually changed.
When the split die installed in the central portion of the plurality of split dies is arranged so as to project toward the material to be molded from the split die installed at the end portion, the grip portion causes the said. The first mode in which the material to be molded is pressed against the material to be molded only by the split die arranged in the central portion while applying a tensile force to the material to be molded.
When the plurality of split dies arranged at the central portion and the end portion are arranged so as to impart a curved shape to the material to be molded, the grip portion pulls the material to be molded. A stretch molding apparatus having a second mode in which the plurality of divided dies arranged at the central portion and the end portions press the material to be molded while applying a force. With the mold
A grip portion that grips both ends of the long material to be molded,
With
The cross-sectional shape of the mold has a curved shape in which the central side of the molding surface bulges, and the molding surface of the mold is formed so as to impart a curved shape to the material to be molded.
A first mode in which a pulling force is applied to the material to be molded by the grip portion, and only the central portion of the molding surface of the mold presses the material to be molded.
A stretch molding apparatus having a second mode in which the entire surface of the molding surface of the mold presses the material to be molded while applying a tensile force to the material to be molded by the grip portion. 1st mold and
A grip portion that grips both ends of the long material to be molded,
With
The cross-sectional shape of the first mold has a curved shape in which the central side of the molding surface is bulged, and the molding surface of the first mold is formed so as to impart a curved shape to the material to be molded. It is a stretch molding method using a stretch molding device.
A step of installing a second mold having a length along the longitudinal direction of the material to be molded shorter than the molding surface and having a second molding surface along the molding surface at the center of the molding surface.
When the second mold is installed on the molding surface, a step in which only the second mold presses the material to be molded while applying a tensile force to the material to be molded by the grip portion.
When the second mold is removed from the molding surface, the step of pressing the material to be molded by the first mold while applying a tensile force to the material to be molded by the grip portion.
Stretch molding method having. With the mold
A grip portion that grips both ends of the long material to be molded,
With
The mold is a stretch molding method using a stretch molding apparatus having a plurality of divided dies which are divided into a plurality of molds in the longitudinal direction of the material to be molded and whose positions can be individually changed with respect to the material to be molded.
A step of arranging the divided dies installed in the central portion of the plurality of divided dies so as to project toward the material to be molded from the divided dies installed at the end portions.
A step of applying a tensile force to the material to be molded by the grip portion and pressing the material to be molded only by the split mold arranged in the central portion.
When the plurality of split dies arranged at the central portion and the end portion are arranged so as to impart a curved shape to the material to be molded, the grip portion pulls the material to be molded. A step in which the plurality of divided dies arranged at the central portion and the end portion press the material to be molded while applying a force.
Stretch molding method having. With the mold
A grip portion that grips both ends of the long material to be molded,
With
The cross-sectional shape of the mold has a curved shape in which the central side of the molding surface is bulged, and the molding surface of the mold is a stretch molding apparatus formed so as to impart a curved shape to the material to be molded. It is a stretch molding method using
A step of applying a tensile force to the material to be molded by the grip portion and pressing the material to be molded only by the central portion of the molding surface of the mold.
A step in which the entire surface of the molding surface of the mold presses the material to be molded while applying a tensile force to the material to be molded by the grip portion.
Stretch molding method having.

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