JP7653213B2 - Mold device and method for producing foamed body - Google Patents

Description

This disclosure relates to a mold apparatus and a method for producing a foam using the mold apparatus.

Conventionally, there has been known a mold device for a foam molding die having an upper mold and a lower mold that are divided vertically. Such a foam molding die produces a foam by foaming a foaming material in a cavity that is formed when the upper and lower molds are closed.

In such a mold device, the ends of the upper and lower dies are clamped by a clamping mechanism (see, for example, Patent Document 1). By clamping the upper and lower dies in this way, the gap around the cavity is closed, preventing the foaming material from leaking out around the cavity and causing burrs in the foam.

Publication number 3-15286

In such a mold device, a pressing position in which the upper and lower dies are pressed together by the clamping mechanism is switched to a release position in which the upper and lower dies are released from the pressing position. The mold device opens the mold when the clamping mechanism is in the release position. At this time, it is preferable that the mold device be able to open smoothly without interference between the clamping mechanism and the mold body. The object of the present disclosure is to provide a mold device that allows smooth mold opening, and a method for manufacturing a foamed body using this mold device.

The mold device according to the present disclosure has a first mold and a second mold extending in the front-rear direction, and closes the first mold and the second mold to form a cavity. The mold device is provided with a support section disposed behind the first mold and the second mold, which rotatably supports the first mold and the second mold, a first displacement section provided on the front surface of the first mold and displaceable between a pressing position where the second mold is pressed against the first mold and a release position where the pressure is released, a second displacement section provided on the rear surface of the first mold and displaceable between the pressing position and the release position, and an interlocking section which interlocks the first displacement section and the second displacement section so that the amount of displacement of the second displacement section is greater than the amount of displacement of the first displacement section.

The method of manufacturing a foamed body disclosed herein involves pouring a foaming material into the cavity of the above-mentioned mold device, and allowing the foaming material to foam and harden within the cavity to form a foamed body.

With this mold device, the first and second molds are opened around the support part. When the mold device is opened, the displacement amount of the second displacement part provided on the rear side where the support part is located moves larger than the displacement amount of the first displacement part. This makes it possible to prevent the second displacement part from interfering with the second mold when the mold device is opened. As a result, this mold device allows for smooth mold opening. Furthermore, a foam manufacturing method using such a mold device allows for efficient production of foam with fewer flashes.

The present disclosure provides a mold apparatus that allows smooth mold opening, and a method for manufacturing a foam using this mold apparatus.

FIG. 2 is a side view of a mold apparatus according to the first embodiment of the present disclosure. FIG. 4 is a view showing a second displacement portion of the mold device in the first embodiment of the present disclosure. 1 is a side view showing an opened and closed state of a mold device in a first embodiment of the present disclosure. FIG. FIG. 4 is a bottom schematic view showing an interlocking portion in the first embodiment of the present disclosure. FIG. 11 is a bottom schematic view showing an interlocking portion according to a second embodiment of the present disclosure. 13 is a schematic diagram showing a first displacement portion and a second displacement portion in a third embodiment of the present disclosure. FIG. FIG. 13 is a bottom schematic view showing an interlocking portion according to a fourth embodiment of the present disclosure. FIG. 13 is a side view of a mold apparatus according to a fifth embodiment of the present disclosure. FIG. 13 is a top schematic view showing the position of a displacement portion in the sixth embodiment of the present disclosure. FIG. 13 is a schematic diagram of a mold apparatus according to another embodiment of the present disclosure. FIG. 13 is a schematic diagram of a mold apparatus according to another embodiment of the present disclosure. 13 is a schematic diagram showing a first displacement portion and a second displacement portion illustrating a modified example of the third embodiment of the present disclosure. FIG.

(1) First embodiment Hereinafter, a first embodiment of the present disclosure will be described with reference to the drawings. In this embodiment, as shown in FIG. 1 and FIG. 2, a mold device 1 includes a lower mold (an example of a first mold) 2, an upper mold (an example of a second mold) 4, a lower frame 6, an upper frame 8, a hinge portion (an example of a support portion) 10, a first displacement portion 12, a second displacement portion 14, an interlocking portion 16, a transmission arm 18, and an opening/closing arm 20. The mold device 1 is a device that injects a foaming material into a cavity formed by closing the lower mold 2 and the upper mold 4, and foams and hardens the foaming material to form a foam. In this embodiment, the foaming material is a foaming resin material in which an A liquid mainly containing isocyanate and a B liquid mainly containing polyol are mixed in the cavity. The cavity is formed into a shape that matches, for example, an energy absorbing material used in automobiles.

The lower mold 2 and the upper mold 4 are structures that extend in both the front-to-back and left-to-right directions. In the lower mold 2 and the upper mold 4, a cavity (not shown) is formed according to the foam to be produced. In this embodiment, the lower mold 2 and the upper mold 4 are made of aluminum. However, the lower mold 2 and the upper mold 4 may be made of any material that can be used to mold a foam.

The lower frame 6 is a structure extending in the front-rear direction and supports the lower mold 2 from below. The upper frame 8 is a structure extending in the front-rear direction and supports the upper mold 4 from above. The hinge portion 10 is provided on the rear end side of each of the lower frame 6 and the upper frame 8. The hinge portion 10 supports the upper frame 8 so that it can swing relative to the lower frame 6, with an axis extending in the left-right direction as the center of rotation. In other words, the hinge portion 10 supports the upper mold 4 so that it can swing relative to the lower mold 2 via the lower frame 6 and the upper frame 8.

The first displacement part 12 is provided on the front surface of the lower die 2, and is displaced between a pressing position Pa (see FIG. 3) where the upper die 4 is pressed against the lower die 2, and a release position Pb (see FIG. 3) where the pressure is released. As shown in FIG. 1, in this embodiment, the first displacement part 12 has a first shaft 12a, a first lever 12b, and a first piece 12c. The first shaft 12a is provided on the front surface of the lower die 2. The first lever 12b is a rod-shaped member that swings back and forth between the pressing position Pa and the release position Pb around the first shaft 12a. The first piece 12c is a cylindrical roller that rotates around a piece shaft 12d that is provided on the first lever 12b and extends in the left-right direction.

A first retaining portion 22 is provided on the front surface of the upper mold 4. The first retaining portion 22 fits with the first displacement portion 12 to hold the first displacement portion 12 in the pressing position Pa. In this embodiment, a recess is provided on the upper surface of the first retaining portion 22, and the first piece 12c fits into the recess to hold the first lever 12b in the pressing position Pa.

The second displacement part 14 is provided on the rear surface of the lower die 2 and displaces between a pressing position Pa where the upper die 4 is pressed against the lower die 2 and a release position Pb where the pressure is released. In this embodiment, the second displacement part 14 has a second shaft 14a, a second lever 14b, and a second piece 14c. The second shaft 14a is provided on the rear surface of the lower die 2. The second lever 14b is a rod-shaped member that swings in the front-rear direction between the pressing position Pa and the release position Pb around the second shaft 14a. The second piece 14c is a cylindrical roller that rotates around a piece shaft 14d that is provided on the second lever 14b and extends in the left-right direction.

A second holding portion 24 is provided on the rear surface of the upper mold 4. The second holding portion 24 fits with the second displacement portion 14 to hold the second displacement portion 14 at the pressing position Pa. In this embodiment, a recess is provided on the upper surface of the second holding portion 24, and the second piece 14c fits into the recess to hold the second lever 14b at the pressing position Pa.

As shown in FIG. 2, in this embodiment, two second displacement parts 14 are provided on the rear surface with a gap therebetween in the left-right direction. In each second displacement part 14, the lower end of the second lever 14b is joined by the second joining member 14e, and each second lever 14b oscillates in the front-rear direction in synchronization. In this way, the two second levers 14b that oscillate in a joined state may be considered as one second lever 14b. Similarly, two first displacement parts 12 are provided on the front surface with a gap therebetween in the left-right direction. In each first displacement part 12, the lower end of the first lever 12b is joined by the first joining member 12e, and each first lever 12b oscillates in the front-rear direction in synchronization. As with the second lever 14b, the two joined first levers 12b may be considered as one first lever 12b.

As shown in FIG. 3, the interlocking portion 16 interlocks the first displacement portion 12 and the second displacement portion 14 so that the second displacement amount a2 of the second displacement portion 14 is greater than the first displacement amount a1 of the first displacement portion 12. In this embodiment, the first displacement amount a1 is the angle at which the first lever 12b swings forward about the first shaft 12a. The second displacement amount a2 is the angle at which the second lever 14b swings backward about the second shaft 14a. The second displacement amount a2 may be an angle at which the second lever 14b does not interfere with at least the trajectory of the rear end of the upper mold 4 (the rear end of the second holding portion 24 in this embodiment) when the mold is opened.

The interlocking portion 16 has a synchronous link 16a, a first link member 16b, and a second link member 16c. As shown in Figures 1 and 3, the first link member 16b is connected to one end of the first lever 12b. The second link member 16c is connected to one end of the second lever 14b. The synchronous link 16a connects and synchronizes the first link member 16b and the second link member 16c.

As shown in FIG. 4, in this embodiment, the first link member 16b is connected to the lower end of the first joint member 12e that connects the lower ends of the two first levers 12b. Specifically, as shown in FIG. 1, a ball joint 17 is provided at the lower part of the first joint member 12e, and the first link member 16b is connected to this ball joint 17. Similarly to the first link member 16b, the second link member 16c is also connected via the ball joint 17 to the lower end of the second joint member 14e that connects the lower ends of the two second levers 14b.

As shown in FIG. 4, the synchronous link 16a includes a third link member 16d that is rotatably held on the lower mold 2. The third link member 16d rotates around a rotation shaft 16e. The third link member 16d rotatably holds the first link member 16b at a position that is a first distance R1 from the center of the rotation shaft 16e. The third link member 16d holds the second link member 16c at a position that is a second distance R2 from the center of the rotation shaft 16e. The second distance R2 is longer than the first distance R1.

In this embodiment, the length of the first link member 16b is the same as the length of the second link member 16c. The lengths of the first lever 12b and the second lever 14b are also the same. The center position of the first shaft 12a is at the same height as the center position of the second shaft 14a. That is, the distance from the center of the first piece 12c to the center of the first shaft 12a (see, for example, D1a in FIG. 6) is equal to the distance from the center of the second piece 14c to the center of the second shaft 14a (see, for example, D2a in FIG. 6). Furthermore, the distance from the center of the first shaft 12a to the connection position with the first link member 16b (see, for example, D1 in FIG. 6) is equal to the distance from the center of the second shaft 14a to the connection position with the second link member 16c (see, for example, D2 in FIG. 6). In addition, the distance L1 from the connection position between the first link member 16b and the first lever 12b (in this embodiment, the center position in the front-rear direction of the ball joint 17) to the connection position between the first lever 12b and the third link member 16d is equal to the distance L2 from the connection position between the second link member 16c and the second lever 14b to the connection position between the second lever 14b and the third link member 16d. With this configuration, the first lever 12b and the second lever 14b can be manufactured using a common material, and the manufacturing cost of the mold device 1 can be reduced. In addition, the first link member 16b and the second link member 16c can be manufactured using a common material, and the manufacturing cost of the mold device 1 can be further reduced.

As shown in FIG. 1, the transmission arm 18 is a rod-shaped member having one end (the rear end in this embodiment) connected to the first displacement portion 12 and the other end extending forward. In this embodiment, a transmission arm roller 18a is provided that rotates around the transmission arm 18 as an axis. The opening/closing arm 20 is a rod-shaped member that extends along the front-rear direction above the upper frame 8. In this embodiment, the opening/closing arm 20 is attached above the upper frame 8 and extends beyond the front end of the upper frame 8. In addition, in this embodiment, an opening/closing arm roller 20a is provided that rotates around the opening/closing arm 20 as an axis.

In this embodiment, multiple mold devices 1 are installed on a belt conveyor (not shown) that flows in the left-right direction. In front of the mold device 1, a guide rail for the transmission arm 18 that extends at an incline in the vertical direction along the belt conveyor (not shown) and a guide rail for the opening/closing arm 20 are provided. The transmission arm 18 moves up and down along the guide rail for the transmission arm 18, thereby swinging the first displacement portion 12 back and forth. Similarly, the opening/closing arm 20 moves up and down along the guide rail for the opening/closing arm 20, thereby moving the upper mold 4 up and down.

The mold device 1 configured in this manner closes the mold with the foaming material injected into the cavity, and holds the first lever 12b and the second lever 14b in the pressing position Pa. In this state, when the foaming material has sufficiently foamed and hardened, the process moves to the following procedure. At this time, the lower mold 2 and the upper mold 4 may be heated to promote foaming and hardening of the foaming material. By holding the first lever 12b and the second lever 14b in the pressing position Pa, the mold device 1 prevents gaps from forming around the cavity even if the lower mold 2 and the upper mold 4 are deformed.

When the foaming and hardening is completed, the mold device 1 lowers the transmission arm 18 along the guide rail for the transmission arm 18, and the first lever 12b of the first displacement part 12 swings forward. When the first lever 12b swings forward, the lower end of the first lever 12b moves backward around the first shaft 12a. When the lower end of the first lever 12b moves backward, the first link member 16b of the interlocking part 16 rotates the third link member 16d of the synchronous link 16a (rotating clockwise in FIG. 4). When the third link member 16d rotates, the second link member 16c pulls the lower end of the second lever 14b forward. When the lower end of the second lever 14b is pulled forward, the upper part of the second lever 14b swings backward around the second shaft 14a. In this way, the interlocking part 16 interlocks the first displacement part 12 and the second displacement part 14.

In this embodiment, the second distance R2 over which the third link member 16d holds the second link member 16c is longer than the first distance R1 over which the third link member 16d holds the first link member 16b. Therefore, the distance over which the second link member 16c moves is longer than the distance over which the first link member 16b moves to rotate the third link member 16d. Specifically, the second link member 16c moves more than the first link member 16b by the difference between the length of the arc centered on the rotation axis 16e, which can be calculated from the second distance R2, and the length of the arc centered on the rotation axis 16e, which can be calculated from the first distance R1. As a result, the second displacement amount a2 of the second lever 14b is greater than the first displacement amount a1 of the first lever 12b.

Next, the opening/closing arm 20 moves upward along the guide rail for the opening/closing arm 20. When the opening/closing arm 20 moves upward, the upper mold 4 moves upward around the hinge portion 10, opening the mold. In this way, when opening the mold, the rear surface of the upper mold 4 and the second holding portion 24 move in a trajectory that draws an arc toward the rear while lifting upward. Therefore, the rear surface of the upper mold 4 and the second holding portion 24 move toward the second lever 14b of the second displacement portion 14. On the other hand, the front surface of the upper mold 4 and the first holding portion 22 also move in a trajectory that draws an arc toward the rear while lifting upward, moving away from the first lever 12b of the first displacement portion 12. Therefore, in the mold device 1, the second displacement amount a2 of the second displacement portion 14 is made larger than the first displacement amount a1 of the first displacement portion 12, so that the trajectory of the rear surface of the upper mold 4 and the second holding portion 24 does not interfere with the second lever 14b. As a result, the mold device 1 can open smoothly. Furthermore, with this configuration, the mold device 1 can switch between the pressing position Pa and the release position Pb by lowering the transmission arm 18 downward in accordance with the first displacement amount a1, which is a small displacement amount. This shortens the time required to switch between the pressing position Pa and the release position Pb, and shortens the time from the mold closed state to mold opening. As a result, when using this mold device 1, production efficiency can be improved.

In this way, after the mold device 1 opens, the foamed resin molded product (an example of a foamed body) is removed, completing the production of the foamed resin molded product. The foamed resin molded product produced by this manufacturing method has few burrs and good shape precision. Furthermore, since the upper mold 4 can be opened smoothly without interfering with the second displacement section 14, production efficiency is improved and costs are reduced.

(2) Second embodiment Next, a mold apparatus 201 according to a second embodiment of the present disclosure will be described with reference to Fig. 5. In the description of the second to sixth embodiments, only the differences from the mold apparatus 1 according to the first embodiment will be described.

As shown in FIG. 5, in this embodiment, the interlocking portion 216 has a length L2 of the second link member 216c that is shorter than the length L1 of the first link member 216b. The lengths of the first lever 212b and the second lever 214b are the same. The interlocking portion 216 includes a third link member 216d as a synchronous link 216a. The third link member 216d in this embodiment rotatably holds the first link member 16b at a position that is a first distance R1 from the center of the rotation shaft 216e. The third link member 216d holds the second link member 216c at a position that is a second distance R2 from the center of the rotation shaft 216e. The second distance R2 is equal to the first distance R1.

In such a mold device 201, when the first lever 212b swings forward, the amount of forward movement of the connection between the second link member 216c and the second lever 214b is greater than the amount of rearward movement of the connection between the first link member 216b and the first lever 212b. As a result, the second displacement amount a2 of the second lever 214b is greater than the first displacement amount a1 of the first lever 212b.

(3) Third embodiment Next, a mold device 301 according to a third embodiment of the present disclosure will be described with reference to FIG. 6. As shown in FIG. 6, the mold device 301 according to the third embodiment has a first lever 312b and a second lever 314b with different lengths. Specifically, a distance D2 from the center of the second shaft 314a of the second lever 314b to the connecting position of the second link member 316c (the ball center position of the ball joint in the vertical direction in this embodiment) is shorter than a distance D1 from the center of the first shaft 312a of the first lever 312b to the connecting position of the first link member 316b. A distance D2a from the center of the second shaft 314a of the second lever 314b to the center of the second piece 314c is equal to a distance D1a from the center of the first shaft 312a of the first lever 312b to the center of the first piece 312c. In this embodiment, the lengths of the first link member 316b and the second link member 316c are the same. In addition, the synchronous link 316a (not shown) in this embodiment includes a third link member 316d (not shown), and similar to the second embodiment, the distance from the center of the rotating shaft 316e (not shown) to the holding positions of the first link member 316b and the second link member 316c is the same.

In such a mold device 301, when the first lever 312b swings forward, the amount by which the connection between the second link member 316c and the second lever 314b moves forward is the same as the amount by which the connection between the first link member 316b and the first lever 312b moves backward. However, because the distance D2 is shorter than the distance D1, the angle by which the second lever 314b swings backward is larger even for the same amount of movement. As a result, the second displacement amount a2 of the second lever 214b is larger than the first displacement amount a1 of the first lever 212b.

(4) Fourth embodiment Next, a mold device 401 according to a fourth embodiment of the present disclosure will be described with reference to FIG. 7. In this embodiment, the synchronous link 416a includes a first link member 416b, a second link member 416c, a link support portion 416d, and a slide portion 416e. The link support portion 416d rotatably supports the first link member 416b and the second link member 416c. The slide portion 416e slides the link support portion 416d in the left-right direction. The distance L2 from the center of the link support portion 416d to the connecting position between the second link member 416c and the second lever 414b is shorter than the distance L1 from the center of the link support portion 416d to the connecting position between the first link member 416b and the first lever 412b.

In such a mold device 401, the first lever 412b swings forward. When the first lever 412b swings forward, the lower end of the first lever 412b moves rearward. When the lower end of the first lever 412b moves rearward, the first link member 416b moves the link support portion 416d of the synchronous link 416a in the left-right direction along the sliding direction of the slide portion 416e. When the link support portion 416d moves left-right (rightward in this embodiment), the second link member 416c pulls the lower end of the second lever 414b forward. When the lower end of the second lever 414b is pulled forward, the upper portion of the second lever 414b swings rearward.

At this time, because the distance L2 is shorter than the distance L1, the amount of movement of the lower end of the second lever 414b is greater than the amount of movement of the first lever 412b. Therefore, the second displacement amount a2 of the second lever 414b is greater than the first displacement amount a1 of the first lever 412b.

(5) Fifth embodiment Next, a mold device 501 according to a fifth embodiment of the present disclosure will be described with reference to FIG. 8. In this embodiment, the synchronous link 516a includes a first link member 516b, a second link member 516c, a link support portion 516d, and a slide portion 516e. This embodiment differs from the fourth embodiment in that the sliding direction is the up-down direction. The other configurations are the same as those of the fourth embodiment, and therefore will not be described. Even in such a mold device 501, the second displacement amount a2 of the second lever 514b can be made larger than the first displacement amount a1 of the first lever 512b.

(6) Other Embodiments Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the invention. In particular, the multiple modifications described in this specification can be arbitrarily combined as necessary.

For example, as shown in FIG. 9, the mold device 601 may be provided with a pair of third displacement parts 630 and a fourth displacement part 632 in the left-right direction (sixth embodiment). In this case, the amount of displacement of the lever of the second displacement part 614, which is located at the rear in the front-rear direction and is on the hinge part 610 side, may be made larger than the amount of displacement of the levers of the first displacement part 612, the third displacement part 630, and the fourth displacement part 632.

As shown in FIG. 10(a), the mold device 701 may have no upper frame 8 as shown in the first embodiment, and the hinge portion 710 may be provided directly on the lower mold 702 and the upper mold 704. In the case of such a mold device 701, as shown in FIG. 10(b), a space S may be provided in the lower mold 702 and the upper mold 704, and the second displacement portion 714 may be disposed in the space S. The other first displacement portion 712, the third displacement portion 730, and the fourth displacement portion 732 may be disposed in the same manner as in the sixth embodiment. Furthermore, as shown in FIG. 10(c), two second displacement portions 714 may be disposed in the space S with a gap therebetween in the left-right direction. Even in such a mold device 701, the displacement amount of the lever of the second displacement portion 714 on the hinge portion 710 side may be made larger than the displacement amount of the lever of the first displacement portion 712, the third displacement portion 730, and the fourth displacement portion 732.

Furthermore, as shown in FIG. 11(a), the mold device 801 may eliminate the space S of the mold device 701 and provide the hinge portion 810 directly on the rear surface of the lower mold 802 and the upper mold 804. In this case, as shown in FIG. 11(b), a second displacement portion 814 may be provided between the hinge portions 810. Also, as shown in FIG. 11(c), the second displacement portion 814 may be provided on both the left and right sides of the hinge portion 810. Even in this case, the displacement amount of the lever of the second displacement portion 814 on the hinge portion 810 side may be made larger than the displacement amount of the levers of the first displacement portion 812, the third displacement portion 830, and the fourth displacement portion 832.

In the third embodiment, the distance D2 from the center of the second shaft 314a of the second lever 314b to the connecting position of the second link member 316c is shorter than the distance D1 from the center of the first shaft 312a of the first lever 312b to the connecting position of the first link member 316b, but the present disclosure is not limited to this. For example, as shown in FIG. 12, the distance D2a from the center of the second shaft 314a of the second lever 314b to the center of the second block 314c may be longer than the distance D1a from the center of the first shaft 312a of the first lever 312b to the center of the first block 312c. In this case, the distance D2 and the distance D1 may be equal. In this way, the second displacement amount a2 can be made larger than the first displacement amount a1 by making the distance D2a longer than the distance D1a.

As described above, the present disclosure provides mold devices 1, 201, 301, 401, 501, 601, 701, and 801 that allow smooth mold opening.

1: mold device, 2: lower die, 4: upper die, 6: lower frame, 8: upper frame, 10: hinge portion,
12: first displacement portion, 12a: first shaft, 12b: first lever, 12c: first link 12d: link shaft, 12e: first joint member 14: second displacement portion, 14a: second shaft, 14b: second lever, 14c: second link 14d: link shaft, 14e: second joint member 16: interlocking portion, 16a: synchronous link, 16b: first link member, 16c: second link member 16d: third link member, 16e: rotating shaft 18: transmission arm, 18a: transmission arm roller 20: opening/closing arm, 20a: opening/closing arm roller 22: first holding portion, 24: second holding portion 516d: link support portion 516e : Slide portion D1: Distance, D2: Distance L1: Distance, L2: Distance R1: First distance, R2: Second distance Pa: Pressed position, Pb: Released position a1: First displacement amount, a2: Second displacement amount

Claims (8)

A mold apparatus having a first mold and a second mold extending in a front-rear direction, the first mold and the second mold being closed to form a cavity,
a support portion disposed behind the first die and the second die and configured to rotatably support the first die and the second die;
a first displacement portion provided on a front surface of the first mold and displaceable between a pressing position where the second mold is pressed against the first mold and a release position where the pressing is released;
a second displacement portion provided on a rear surface of the first mold and displaceable between the pressing position and the release position;
an interlocking portion that interlocks the first displacement portion and the second displacement portion such that a displacement amount of the second displacement portion is larger than a displacement amount of the first displacement portion;
A mold apparatus comprising: the first displacement portion is a first lever that swings in a front-rear direction between the pressing position and the release position around a first axis provided on the front surface of the first die,
the second displacement portion is a second lever that swings in a front-rear direction between the pressing position and the release position around a second axis provided on the rear surface of the second die,
The interlocking portion includes a first link member connected to one end of the first lever, a second link member connected to one end of the second lever, and a synchronization link that connects and synchronizes the first link member and the second link member.
The mold apparatus according to claim 1 . a distance from the second shaft of the second lever to a connecting position of the second link member is shorter than a distance from the first shaft of the first lever to a connecting position of the first link member;
The mold apparatus according to claim 2. The first lever and the second lever have the same length.
The mold apparatus according to claim 2. The length of the second link member is shorter than the length of the first link member.
The mold apparatus according to any one of claims 2 to 4. the synchronous link includes a third link member rotatably held by the first die;
the third link member rotates about a rotation axis, holds the first link member at a first distance from the rotation axis, and holds the second link member at a second distance from the rotation axis;
The second distance is greater than the first distance.
The mold apparatus according to any one of claims 2 to 5. The synchronous link includes a link support portion that rotatably supports the first link member and the second link member, and a slide portion that slides the link support portion.
The mold apparatus according to any one of claims 2 to 5. A foaming material is poured into the cavity of the mold apparatus according to any one of claims 1 to 7, and the foaming material is foamed and cured in the cavity to form a foam.
A method for producing a foam.