JPH1148254A - Device for restricting the opening of foaming molds - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably degas the space between an upper die and a lower die, and to appropriately adjust the size of the space so that optimal degassing can be performed. An opening restricting device is provided on an upper die and is swingably displaced by an operating means. The opening restricting device is freely adjustable to protrude and retract from a swinging tip of the swinging lever. , And a regulating member 38 disposed on the open end side of the lower mold 14. When releasing the gas from the cavity 18, the upper die 12 is opened to a position where the open end 40 a of the adjusting member 40 abuts on the regulating member 38 under the condition that the engagement between the clamp lever 22 and the engaging member 26 is released. The size of the gap S between the upper mold 12 and the lower mold 14 is constantly regulated while adjusting the distance between the regulating member 38 and the adjusting member 40 by restricting further opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for restricting the opening of a foaming mold, and more particularly, to a gas generated in the course of a reaction of a foamed material injected into a cavity. The present invention relates to an opening regulating device that regulates an opening amount of an upper mold with respect to a lower mold when releasing the mold and a lower mold from a gap formed by slightly opening the mold.

[0002]

2. Description of the Related Art Various foam products made of urethane or the like are prepared by injecting a predetermined amount of foam molding material (hereinafter referred to as "foam material") into a cavity formed inside a foam molding die. It is formed into a predetermined shape by foaming and solidifying inside. As shown in FIG. 10, for example, the foaming mold is basically composed of an upper mold 12 and a lower mold 14 which are vertically openable and closable about a pivot 16 located at one end. And
The upper mold 12 and the lower mold 14 are clamped to form the cavity 18 having a predetermined shape inside, and the upper mold 12 is opened from the lower mold 14 to expose the cavity 18. I have. The foamed material injected into the cavity 18 becomes cloudy and creamy due to a chemical reaction, generates fine bubbles, and starts foaming. After a predetermined time (rising time), the entire foam 18 is filled. And solidification completes foaming. In the foaming mold, the upper mold 12 is opened, a foaming material is injected into the cavity 18 of the lower mold 14, and then the upper mold 12 and the lower mold 14 are clamped to form a foaming reaction in the cavity 18. Injection type and upper mold 12
In a state where the mold and the lower mold 14 are clamped in advance, the injection port of the injection device is brought into contact with an injection port (not shown) formed at a required position of the mold to inject the foaming material into the cavity 18. There is a closed injection type in which a foaming reaction proceeds in the inside.

[0003] The foaming mold 60 is provided with an upper mold 12.
The clamp device 20 disposed on the upper surface on the open end side of
By clamping the upper mold 12 so that it cannot be opened with respect to the lower mold 14, it corresponds to the expansion pressure of the foam material filling the entire cavity 18. The clamp device 20 includes a support piece 28 fixed to the open end side of the upper mold 12.
And a fluid pressure cylinder 24 fixed to the upper surface of the upper die 12 and clevis-joined to the upper end of the clamp lever 22.
And an engaging member 26 fixed to the open end side of the lower mold 14 and having an L-shaped longitudinal section to which the clamp piece 23 at the lower end of the clamp lever 22 is engaged. That is, in a state where the upper mold 12 is covered with the lower mold 14, when the fluid pressure cylinder 24 is controlled so that the rod 24a moves forward, the clamp lever 22 swings clockwise in FIG. As shown in FIG.
The clamp piece 23 is engaged with the engagement member 26, and the upper mold 12 and the lower mold 14 are tightly clamped.

[0004] In the foam molding process using the foam molding mold 60, in order to promote appropriate foaming and solidification of the foam material, the mold clamping and shaping of the mold 60 are performed from the time of injection to the completion of foaming (solidification). Opening must be done in a timely manner. That is, during the required time before and after the rising time, the upper mold 12 and the lower mold 14 are clamped by the clamp device 20 to maintain the inside of the cavity 18 at a predetermined pressure in order to optimize the cell structure of the foam. After the optimization of the cell structure, the clamping device 20 is brought into a semi-operating state as shown in FIG. 11 (b), and the cavity 18 is formed through the gap S formed between the upper mold 12 and the lower mold 14. The gas generated in the inside is released, and after the gas is released, the expanded foam is completely solidified in its original state.
Operation such as clamping with 0 is performed. That is, when degassing is performed, the mold is closed (FIG. 11).
(See (a)), the fluid pressure cylinder 24 is controlled so that the rod 24a is appropriately retracted (the middle position of the stroke) and the clamp lever 22 is swung counterclockwise in the figure (see FIG. 1).
1 (b)), the upper die 12 is opened by the relative lowering of the clamp piece 23, and the gap S can be formed between the upper die 12 and the lower die 14. As a result, the gas in the cavity 18 is released to the outside from the gap S formed by raising the upper mold 12.

[0005]

By the way, in the foam molding die 60, as described above, the clamp device 20 used for clamping the upper die 12 and the lower die 14 is controlled to be in a semi-operating state. A gap S between the upper mold 12 and the lower mold 14
It is configured to perform degassing by utilizing the fact that is formed. However, the hydraulic cylinder 24, which is the operating source of the clamp device 20, can easily control the positioning of the rod 24a to the most advanced position and the most retracted position, but moves the rod 24a to a predetermined position in the middle of the stroke. It is very difficult to control stop accurately. That is, every time the rod 24a is stopped in the middle of the stroke, a slight error occurs in the stop position of the rod 24a, and the swinging amount of the clamp lever 22 linked thereto becomes unstable, and the size of the gap S varies. Therefore, there is an inherent drawback that degassing under certain conditions cannot be suitably performed. In other words, when the gap S is small, the gas is not smoothly released, so that a problem such as poor foaming occurs. When the gap S is large, an appropriate amount or more of the gas is released. Therefore, there has been a problem that dimensional defects and the like occur due to excessive expansion. Further, in the configuration of the clamp device 20, even if the gap S can be formed by the swing of the clamp lever 22, the gap S
It is almost impossible to appropriately adjust the size of. In particular, the optimal amount of outgassing depends on the shape of the cavity 18.
Although it depends on the (product shape of the foam), the size, the type of the foaming material, and the like, the gap S cannot be adjusted, so that the amount of degassing cannot be adjusted, which is an obstacle to performing a preferable foam molding. Had become.

[0006]

SUMMARY OF THE INVENTION The present invention has been newly proposed in order to solve the above-mentioned problem, and it has been proposed that the upper mold can be released by releasing the upper mold and the lower mold by clamping with a clamping device. When the gas is released, the gap between the upper mold and the lower mold can be kept constant and stable degassing can be performed. Provided is a device for restricting the opening of a foaming mold, which is capable of appropriately adjusting the size of the gap and performing optimal foaming by performing optimal degassing based on the shape of the cavity and the material of the foaming material. With the goal.

[0007]

[Means for solving the problems] To overcome the above-mentioned problems,
In order to achieve the intended purpose, the foam molding die according to the present invention is configured such that an upper mold and a lower mold are pivotally connected at one end so as to be freely opened, and the upper mold and the lower mold are attached to the open end side of the upper mold or the lower mold. The upper mold and the lower mold are clamped by engaging a swingable clamp lever with an engaging member provided on the open end side of the corresponding lower mold or upper mold. The foam material injected into the internal cavity is foamed, and the upper mold is slightly opened from the lower mold by swingingly displacing the clamp lever, and the gap is formed through the gap formed between both molds. In a foam molding die configured to release gas generated in a cavity, a swing lever disposed in parallel with the clamp lever and swingably displaced by an appropriate actuating means; It is disposed on a protruding piece extending inward from the swinging tip, An adjusting member for advancing and retracting adjustably protruding directed to the bar pivot center side of being disposed in the lower die or the open end side of the upper die so as to correspond to the swing lever,
A regulating member that contacts the open end of the adjusting member and regulates further opening of the upper mold while the upper mold is being opened, and the upper mold and the lower mold are formed when the foam material is foamed. Under the tightened state, the swinging lever is swung by the operating means to bring the adjusting member close to the engaging member, and the open end of the adjusting member is moved to a desired position with respect to the abutment portion of the regulating member. When releasing the gas from the cavity while positioning while maintaining the gap, the position where the open end of the adjusting member comes into contact with the regulating member while the clamp lever is released from being engaged with the engaging member. The upper die is opened up to this point, and further opening is restricted, so that the size of the gap is regulated to be constant at the required interval.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an apparatus for restricting the opening of a mold for foam molding according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments. The same members as those described in the related art will be described with the same reference numerals.

FIG. 1 is a perspective view schematically showing a foaming mold 10 according to a preferred embodiment of the present invention. The foaming mold 10 of this embodiment is a conventional foaming mold described above. Similar to the molding die 60, this is a vertical split type split die including an upper die 12 and a lower die 14 which can be tightly closed with each other. By opening the cavity 14, a cavity 18 (see FIG. 8) having a predetermined shape formed therein can be exposed.
Note that the foaming mold 10 of the embodiment is an open injection type, in which the upper mold 12 is opened to inject a foaming material into the cavity 18 of the lower mold 14, and then the upper mold 12 and the lower mold 14 are opened. And the foaming reaction proceeds in the cavity 18.

In the foam molding die 10 of this embodiment, FIG.
The upper die 12 and the lower die 1 are provided on both sides of the upper surface of the upper die 12 as shown in FIG.
Two swing lever type clamping devices 20 for clamping the mold with the mold 4 are provided. These left and right clamping devices 20, 20 are basically the same as those provided in the conventional foaming mold 60 described above, and as shown in FIG. 8, a support fixed to the open end side of the upper mold 12. A clamp lever 22 swingably disposed on a piece 28 via a support shaft 30, a first hydraulic cylinder 24 fixed to the upper surface of the upper die 12 and clevis-joined to an upper end of the clamp lever 22, Type 1
4 and an engaging member 26 having an L-shaped longitudinal section, to which the clamp piece 23 at the lower end of the clamp lever 22 is engaged and is fixed. The two clamp devices 20, 20 are controlled synchronously by a control device (not shown), and when the lower die 14 covers the upper die 12, FIG.
As shown in (b), the first hydraulic cylinder 24 is
When the clamp lever 22 is controlled to move forward, the clamp lever 22 swings clockwise around the support shaft 30 in the figure, and the clamp piece 23 of the clamp lever 22 engages with the engaging member 26, and The mold 14 is tightly closed with the mold. FIG.
(b) and FIG. 7 (b), the first hydraulic cylinder 2
4 is controlled so that the rod 24a is retracted, the clamp lever 22 swings counterclockwise in the figure around the support shaft 30, and the engagement between the clamp piece 23 of the clamp lever 22 and the engagement member 26 is released. Then, the upper mold 12 and the lower mold 14 can be opened. In addition, each of the clamp devices 20 and 20 provided in the foam molding die 10 of the embodiment includes a lower die 14 and an upper die 1.
It is designed to be used only for the purpose of mold clamping with 2.

In the foam molding die 10 of this embodiment, the upper die 12 is regulated at the center of the upper surface of the upper die 12 so that the upper die 12 can be opened by a predetermined amount with respect to the lower die 14 as shown in FIG. A swinging lever type opening restricting device 32 is provided. As shown in FIG. 2, the opening restriction device 32
A swinging lever 34 slidably mounted on a support piece 42 fixed to the open end side of the upper mold 12 via a support shaft 44, and an upper end side of the swinging lever 34 fixed to the center of the upper surface of the upper die 12 A second hydraulic cylinder (operating means) 36 which is clevis-bonded to the control member, a regulating member 38 fixed to the open end side of the lower mold 14, and an adjusting member 40 disposed at the lower end of the swing lever 34. It is composed of In the opening restricting device 32 of the embodiment, two swinging levers 34, 34 are arranged at a predetermined interval, and a connecting plate 46 is fixed between the upper ends of the swinging levers 34, 34. The second hydraulic cylinder 36 is clevis-joined to the plate 46, and the two swing levers 34, 34 are synchronously swung by the operation of one of the second hydraulic cylinders 36. ing.

Therefore, similarly to the clamp device 20,
If the second hydraulic cylinder 36 is controlled so that the rod 36a moves backward, as shown in FIG.
4 and 34 pivot about a support shaft 44 in the counterclockwise direction in the figure, and connect the second hydraulic cylinder 36 to a rod 36.
If a is controlled so as to move forward, as shown in FIG.
Each swing lever 34, 34 swings clockwise.

At the lower end of each swing lever 34,
A protruding piece 35 extending substantially rearward at a right angle from the main body of the swing lever 34 is integrally formed, and a hexagonal bolt as the adjusting member 40 is provided on the protruding piece 35 as shown in FIG.
The regulating end 40a on the upper surface is rotatably screwed in a state in which the regulating end 40a is directed to the support shafts 44, 44, which are the pivot centers of the pivot lever 34. When the second hydraulic cylinder 36 is controlled so that the rod 36a moves forward, and the swing lever 34 swings clockwise as shown in FIG. The restricting member 38 is configured to arrive below a horizontally extending contact receiving piece (planned contact portion) 38a. Further, the adjusting member 40 can adjust the extension length from the upper surface of the protruding piece 35 by rotating in the radial direction, so that the regulating end 40a and the contact receiving piece 38a of the regulating member 38 can be adjusted. Is displaced. That is, the interval T between the adjusting member 40 and the regulating member 38 is an allowable amount that the upper mold 12 can be opened with respect to the lower mold 14, and the regulating end portion 40a of the adjusting member 40 is 5A, the gap S corresponding to the interval T is formed between the lower mold 14 and the upper mold 12, as shown in FIG. Therefore, by adjusting the extension height of the adjustment member 40, the size of the interval T is displaced, and as a result, the gap S at the time of degassing is changed.
Can be adjusted in size.

[0014]

Next, the operation of the opening restricting device 32 of the foam molding die 10 according to the present embodiment configured as described above will be described. Before foam molding, the first hydraulic cylinder 24 and the second hydraulic cylinder 36
Are controlled by a control device (not shown).
a is controlled to be retracted. Then, prior to the foam molding, the extension length of the adjustment member 40 is adjusted, and the size of the gap S formed between the upper mold 12 and the lower mold 14 is set. The size of the gap S is set based on conditions such as the shape and size of the cavity 18 and the material of the foamed material, on the assumption that optimal degassing can be achieved.

After the adjustment of the extension length of the adjusting member 40 is completed, the upper mold 12 is opened with respect to the lower mold 14 and the cavity 18 of the lower mold 14 is opened as an injection step in foam molding.
A predetermined amount of foam material is injected into the inside, and after the injection is completed, the upper mold 12 is again covered with the lower mold 14. Then, the foaming reaction of the foaming material proceeds in the cavity 18 and, before the rising time as appropriate, in each of the clamp devices 20 as shown in FIG. The clamp piece 22 of the clamp lever 22 is engaged with the engaging member 26 by swinging the clamp lever 22 under the control of the control lever. Thereby, the upper mold 12 and the lower mold 1
4 is tightly clamped, and the inside of the cavity 18 is maintained at a predetermined pressure, so that the cell structure of the foam U is optimized.

In the opening restriction device 32, FIG.
As shown in (a), the second hydraulic cylinder 36 is
The adjusting member 40 is moved below the contact receiving piece 38a of the regulating member 38 by controlling the a to move forward and swinging the swing lever 34. In this embodiment, the control of the opening regulating device 32 is performed by the clamping device 2.
Although the case where the control is performed at the same time as the control of 0 is shown, the swing operation of the swing lever 34 may be performed in a timely manner until a gas release step described later is started.

When the cell structure of the foam U is adjusted to be appropriate by the mold clamping after the rising time, the gas generated in the cavity 18 by the foaming reaction is released. That is, in the degassing step, as shown in FIG. 5B, in each clamp device 20, the first hydraulic cylinder 24 is controlled so that the rod 24a is retracted, and the clamp lever 22 is swung in the opposite direction to the front. Thereby, the engagement between the clamp piece 23 and the engagement member 26 is completely released. Thereby, the upper die 12 is pushed upward by the expansion pressure of the foam U, and as shown in FIG. 5A, the regulating end 40a of the adjusting member 40 comes into contact with the contact receiving piece 38a of the regulating member 38. A predetermined gap S between the upper mold 12 and the lower mold 14
Is formed, and the gas in the cavity 18 is discharged to the outside of the foam molding die 10 through the gap S. In addition, as shown in FIGS. 5 (a) and 6 (a), the opening regulating device 32 in the degassing step is controlled so that the rod 36a advances the second hydraulic cylinder 36.

When the degassing step is completed, FIG.
In each of the clamp devices 20, the first hydraulic cylinder 24 is again controlled so that the rod 24a moves forward to swing the clamp lever 22, thereby causing the clamp piece 23 of the clamp lever 22 to engage with the engaging member 26. Mooring. As a result, the upper mold 12 and the lower mold 14 are tightly clamped again, and the expanded foam U is pressed from the inside of the cavity 18 to be pressed and held in an appropriate shape. To solidify.

When the solidification of the foam U is completed, FIG.
The upper mold 12 is opened from the lower mold 14 as shown in FIG. That is, in each of the clamp devices 20, as shown in FIG. 7B, the first hydraulic cylinder 24 is controlled so that the rod 24a is retracted, and the clamp lever 22 is swung, so that the clamp piece 23 and the engaging member 26 is completely disengaged. In addition, in the opening restriction device 32, as shown in FIG. 7A, the second hydraulic cylinder 36 is controlled so that the rod 36a is retracted, and the rocking lever 34 is rocked. 38 from below. Thereby, the upper mold 1
2 can be opened, and the foam U can be taken out from the exposed cavity 18.

As described above, in the apparatus for restricting the opening of the foaming mold according to the present embodiment, the opening amount of the upper mold 12 is regulated based on the interval T set by the adjusting member 40 and the regulating member 38. When the gas generated by the foaming reaction of the foaming material in the cavity 18 is released, the gas can be vented from the gap S which is always formed to be constant, and the gas venting amount does not vary. Also,
By adjusting the extension length of the adjusting member 40, the size of the gap S can be changed and adjusted, and an optimal degassing based on the shape and size of the cavity 18 and the material of the foam material can be performed. You can set to get.

In the apparatus for restricting the opening of the mold for foam molding according to the present invention, the upper mold 12 of the mold 10 is provided with a plurality of members in the width direction of the mold 10 on the assumption that the upper mold 12 can tolerate a slight deformation (twist). In the case where the opening regulating devices 32 are arranged at appropriate intervals, if the size of the interval T is set non-uniformly for each opening regulating device 32, the opening amount of the upper die 12 can be set at an appropriate position in the width direction. It is possible to change with. For example, as shown in FIG. 9A, a total of three opening regulating devices 32 (32A,
32B, 32C) are arranged at predetermined intervals (the clamp device is omitted), and are formed in the lower mold 14 as shown by broken lines in FIG. 9 and as shown in FIG. 9B. Even if the volume of the cavity 18 is extremely large compared to the volume of the cavity 18b on the right side, it is possible to perform the average gas removal as a whole. That is, since the amount of gas generated during foam molding inevitably increases in the cavity 18a on the left side, the interval T in the opening restricting device 32A located on the left side in the figure is adjusted to be the largest, and the central opening restricting device 32B And right side opening restriction device 32C
Is adjusted such that the gap T ₁ on the left side in the drawing becomes the largest and the gap S _{2 at} the center and the gap S ₃ on the right side gradually decrease toward the right side. it is possible to increase the gas discharge amount capable of unit time in S ₁ portion. Therefore, if the interval T is individually adjusted for each of the opening restricting devices 32 on the premise of the shape of the cavity 18, even if the shape of the cavity 18 is asymmetrical in the left-right direction, an average and suitable gas as a whole is obtained. Drilling can be performed.

[0022]

As described above, according to the apparatus for restricting the opening of a foaming mold according to the present invention, the amount of opening of the upper mold is regulated based on the interval set by the adjusting member and the regulating member. When the gas generated by the foaming reaction of the foaming material in the cavity is released, gas can be vented from the gap formed constantly between the upper mold and the lower mold. There is no variation in the amount of degassing. In addition, by adjusting the extension length of the adjustment member, the size of the gap can be changed, and the size of the gap can be adjusted based on the adjustment. Advantageous effects are obtained such that a suitable foam molding can be realized by performing optimal degassing based on the type of material and the like.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a foam molding die according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a foam molding die showing an opening restricting device for restricting opening of an upper die with respect to a lower die.

FIG. 3 is an enlarged view showing a main part of the adjustment member of the opening restriction device, which is cut away at a single section.

FIG. 4 is a vertical sectional side view of a foaming mold showing an operation state of a clamp device and an opening restricting device in a foaming step in foam molding.

FIG. 5 is a vertical cross-sectional side view of a foaming mold showing an operation state of a clamp device and an opening regulating device in a degassing step in foam molding.

FIG. 6 is a vertical sectional side view of a foaming mold showing an operation state of a clamp device and an opening restricting device in a solidifying step in foam molding.

FIG. 7 is a vertical cross-sectional side view of a foaming mold showing an operation state of a clamp device and an opening restricting device when the mold is opened after completion of foam molding.

FIG. 8 is a partially cutaway side view of a foam molding die showing a clamp device for clamping the upper die and the lower die.

FIG. 9 is a schematic front view of a mold and a plan view of a lower mold showing another embodiment of the apparatus for restricting the opening of a foam molding mold according to the present invention.

FIG. 10 is a side view schematically showing a conventional foam molding die.

FIG. 11 is a vertical sectional side view of a main part showing a state in which gas is vented by operation control of a clamp device in a conventional foam molding die.

[Explanation of symbols]

 12 Upper die 14 Lower die 18 Cavity 22 Clamp lever 26 Engagement member 34 Swing lever 35 Projection piece 36 Second fluid pressure cylinder (operating means) 38 Restriction member 38a Contact receiving piece (planned contacting part) 40 Adjusting member 40a Open End S Clearance T Interval

Continuing from the front page (72) Inventor Koichi Yamagishi 3-1-136 Imaikecho, Anjo-shi, Aichi Pref. Inoac Corporation Anjo Office

Claims (2)

[Claims] An upper die (12) and a lower die (14) are pivotally connected at one end so as to be freely openable, and swing on the open end side of the upper die (12) or the lower die (14). Connect the clamp lever (22) that can be
(14) or an engaging member (26) provided on the open end side of the upper mold (12)
The upper mold (12) and the lower mold (14) are clamped by engaging them with each other, and in this clamped state, the foamed material injected into the internal cavity (18) is foamed, and the clamp lever (2
The lower mold (14) is moved from the lower mold (14) to the upper mold (1
2) is slightly opened to release the gas generated in the cavity (18) through the gap (S) formed between the two dies (12, 14). In the swing lever (34) arranged in parallel with the clamp lever (22) and swingably displaced by an appropriate operating means (36)
Is disposed on a protruding piece (35) extending inward from the swinging tip of the swing lever (34), and projects toward the swing center side of the lever (34) so as to be adjustable forward and backward. An adjusting member (40) is disposed on an open end side of the lower die (14) or the upper die (12) so as to correspond to the swing lever (34), and is provided while the upper die (12) is being opened. A regulating member (38) that contacts the open end (40a) of the adjusting member (40) to regulate the further opening of the upper mold (12). (12) and the lower mold (14) under the clamped state, the swing lever by the operating means (36)
(34) is rocked to bring the adjustment member (40) close to the engagement member (38), and the open end (40a) of the adjustment member (40) is brought into contact with the regulating member (38). (38a) is held and positioned at a required interval (T), and when releasing gas from the cavity (18), engagement of the clamp lever (22) with the engagement member (26) is required. Under the release, the upper die (12) is opened to a position where the open end (40a) of the adjusting member (40) comes into contact with the regulating member (38), and further opening is regulated, An opening regulating device for a foaming mold, wherein the size of the gap (S) is regulated to be constant by the required interval (T). The adjusting member (40) is connected to the swing lever (3).
4) It is possible to adjust the length of the projecting piece (35) extending from the projecting piece (35), and it is possible to change the size of the gap (S) by adjusting the extending length of the adjusting member (40). 2. The device for restricting opening of a foaming mold according to claim 1.