JPH0820032A - Mold for foam molding - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent wrinkles and misalignment from occurring in the trim of the integrated foam molded product. A foam molding die 1 in which a pad material made of a foamable synthetic resin and a trim H2 covering the pad material are integrally bonded by a foaming treatment of a foaming raw material. An adjusting piece 42 for projecting and retracting the inner wall surface of the cavity 4 is provided at an appropriate position. Adjustment piece 42
Is rotatably supported by the support shaft 44 along the inner peripheral surface of the cavity 4 and is provided so as to be retractable from the cavity 4. An adjusting screw 23 for adjusting the protruding amount of the adjusting piece 42 is provided on the side wall of the lower mold 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foaming mold for producing a foamed product having a predetermined shape by filling a cavity with a foamable synthetic resin material and foaming the material.

[0002]

2. Description of the Related Art Foamed products made of urethane foam, ethylene foam, propylene foam or the like are often used for applications requiring cushioning properties and shock absorbing properties. Such a foamed product is manufactured by loading a raw material of a foamable synthetic resin to which a predetermined foaming agent has been added into a cavity of a mold including an upper mold and a lower mold, and performing a predetermined foaming treatment. . Among such foam molding methods is the integral foam molding method. In this integral foam molding method, various articles attached to a foamed product are previously filled in a cavity, and then a foaming raw material is filled in to perform a foaming treatment. By doing so, an integrated foam-molded product in which various accessories are united from the beginning is obtained, which is convenient for simplifying the manufacturing process since post-processing for mounting the accessories later is omitted.

Representative examples of the integrally foam-molded article include automobile seats and headrests. In these, the outer periphery of the foamed product is covered with trim. During the molding process, a trim having the outer shape of the product is loaded inside the cavity in advance, the foaming raw material is filled in the trim, and then a predetermined foaming process is performed. Therefore, when the foamed product is taken out from the cavity, the trim is already integrally bonded to the foamable synthetic resin on the outer peripheral surface thereof.

[0004]

By the way, in the conventional integral foam molding method as described above, the cavity of the mold is set to have a shape corresponding to the outer shape of the foamed product, and the trim covering the foamed product is made of the cavity. Although it is prepared to match the three-dimensional shape, the trim is usually formed by sewing various flat-shaped cut products made of synthetic resin sheets into a three-dimensional shape, so that the trim perfectly matches the three-dimensional shape of the cavity. It is very difficult to do.

Therefore, if the trim is too large, wrinkles may occur at the contact portion with the inner wall surface of the cavity or the trim may be displaced from the proper position when the trim is mounted in the cavity. Correction of such wrinkles and misalignment is virtually impossible because the trim does not originally match the cavity, and as a result, in conventional integral foam molding, the resulting foamed product is There have been problems that irregularities are formed on the outer peripheral surface and wrinkles are generated, resulting in many defective products.

The present invention has been made to solve the above problems and provides a metal mold for foam molding which does not cause wrinkles or displacement in the trim of an integral foam molded product. It is an object.

[0007]

According to a first aspect of the present invention, there is provided a mold for foam molding in which a pad material made of a foamable synthetic resin and a trim for covering the pad material are integrated by a foaming treatment of a foaming raw material. A mold for foam molding to be joined to the mold, characterized in that a cavity shape adjusting means for projecting and retracting an inner wall surface of the cavity is provided at an appropriate position of the cavity of the mold.

According to a second aspect of the present invention, there is provided the foam molding die according to the first aspect, wherein the cavity shape adjusting means includes an adjusting piece provided so as to be retractable from the cavity. It is characterized by having.

A mold for foam molding according to a third aspect of the present invention is the mold for foam molding according to the second aspect, wherein the adjusting piece is accommodated in an adjusting piece accommodating recess formed in a wall surface of the cavity. , The base end is rotatably supported around the support shaft,
By this rotation, the free end side is configured to project and retract from the adjustment piece accommodating recess into the cavity, and a protrusion amount adjusting means for adjusting the protrusion amount of the free end side into the cavity is provided. To do.

A foam molding mold according to a fourth aspect of the present invention is the foam molding mold according to the third aspect, wherein the protrusion amount adjusting means penetrates the mold so as to face the back surface of the adjusting piece. And an adjusting screw that is screwed into the screw hole and has a tip end abutting the back surface of the adjusting piece.

[0011]

According to the mold for foam molding according to claim 1,
Since a cavity shape adjusting means for projecting and retracting the inner wall surface of the cavity is provided at an appropriate position of the cavity of the mold, even if the shape of the cavity does not match the shape of the trim, the above cavity shape adjusting means. It is possible to match the shape of the cavity with the shape of the trim by operating the to move the inner wall surface in and out, and by doing so, the trim is mounted in a state of being surely along the inner wall surface of the cavity.

By mounting the trim so as to be surely along the inner wall surface of the cavity in this way, the wrinkles of the trim of the molded product due to the mismatch of the shape of the cavity and the shape of the trim as in the conventional case are generated. The displacement is effectively suppressed.

According to the mold for foam molding of the above-mentioned claim 2, since the cavity shape adjusting means is provided with the adjusting piece which can be retracted into and out of the cavity, the retracting operation of this adjusting piece is performed. By doing so, the inner wall surface of the cavity can easily conform to the shape of the trim.

According to the foam molding die of the third aspect, since the adjusting piece is accommodated in the adjusting piece accommodating recess formed in the wall surface of the cavity, the adjusting piece is kept in the cavity except when necessary. It is effective in smoothly forming the inner wall surface of the cavity without excessively protruding.

Further, the adjusting piece is rotatably supported on the base end side about the support shaft, and the free end side is projected and retracted from the adjusting piece accommodating recess into the cavity, so that the adjusting piece is properly supported. The amount of protrusion of the adjustment piece into the cavity on the free end side is changed by rotating the adjustment piece about the axis. Further, since the mold is provided with the protrusion amount adjusting means for adjusting the protrusion amount of the adjusting piece into the cavity on the free end side, it is possible to easily adjust it according to the trim shape by operating this adjusting means. The protruding amount of the piece can be set.

According to the mold for foam molding according to the fourth aspect, the protrusion amount adjusting means is screwed into a screw hole which is screwed through the mold so as to face the back surface of the adjusting piece. Since the tip is made up of an adjusting screw that abuts against the back surface of the adjusting piece, rotating the screw forward and backward around the axis causes the tip of the screw to project and retract in the cavity, and the projecting and retracting causes the back surface to contact. The protrusion amount of the contacting adjustment piece is set.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway perspective view showing an example of a foam molding die according to the present invention, and FIG.
It is a line sectional view. FIG. 3 is a partially enlarged perspective view of the main part of FIG. In this embodiment, a mold for a headrest mounted on a seat back of an automobile seat is used as a mold. As shown in FIG. 1, a foam molding mold 1 is basically composed of a lower mold 2 having a cavity 4 formed along the three-dimensional shape of a headrest H and an upper mold 3 closing an upper opening of the lower mold 2. It is configured.

A raw material charging hole 31 for charging a raw material of the foamable synthetic resin into the cavity 4 is provided at one side of the upper mold 3.
Is provided and can be closed by the lid 32. The lid 32 is attached to a bracket 33 protruding from the edge of the upper die 3 via a horizontal shaft 34, and
The raw material charging hole 31 is opened and closed by rotating 2 around the horizontal shaft 34.

An annular edge portion 21 protruding outward is provided on the upper edge portion of the lower die 2, and the edge portion of the upper die 3 is superposed on the annular edge portion 21. It is sized to size. And the upper mold 3 is the lower mold 2
The clamp 5 is attached so as to sandwich the edge of the upper die 3 and the annular edge 21 of the lower die 2 with the upper opening of the upper die 3 closed, and by fastening the clamp 5, the upper die 3 is fixed to the lower die 2. It has become so.

Further, a headrest H is provided at an appropriate position of the upper mold 3.
Rod H fixed to frame H0 embedded inside
1 has a through hole 35 formed therein, the rod H1 is inserted through the through hole 35 so as to project to the outside, and the trim H2 of the headrest H is mounted in the cavity 4 of the lower mold 2. In this state, the upper opening of the cavity 4 is closed by the upper mold 3 and fastened by the clamp 5.
In this state, the raw material of the foamable synthetic resin is supplied from the raw material charging hole 31 into the trim H2 mounted in the cavity 4.

Then, after the raw material is supplied into the trim H2, the raw material charging hole 31 is closed by the lid 32, and in this state, the foamable synthetic resin is subjected to the foaming treatment by heating or the like. Expand while foaming, and the expansion pressure presses the trim H2 against the inner wall surface of the cavity 4, the pad material of the headrest H is formed by the foaming, and the frame H0 is embedded in the pad material. A cavity-shaped headrest H in which H0, the rod H1, and the trim H2 are integrated is molded.

In the present invention, the headrest H is provided at an appropriate position on the inner surface of the cavity 4 formed in the lower mold 2.
Adjustment piece accommodating recess 41 slightly recessed relative to the external shape of
Are formed. In this embodiment, the cavity 4
Although the four adjustment piece accommodating recesses 41 are formed at the four corners of the headrest H, the adjustment piece accommodating recesses 41 are not limited to the above four corners, and may be provided at appropriate places according to the three-dimensional shape of the headrest H. Good.

A trim H2 is provided in the adjusting piece accommodating recess 41.
The adjustment piece 42 is provided so as to follow the three-dimensional shape of the.
As shown in FIG. 3, the adjusting piece 42 is the adjusting piece 4
2 is rotatably supported around a vertical shaft (support shaft) 44 of a bracket 43 provided on one side of the vertical shaft 44.
The amount of protrusion of the adjustment piece 42 is changed by changing the rotation phase of the rotation, and the three-dimensional shape inside the cavity 4 is changed.

On the other hand, on the side portion of the lower mold 2, a screw hole 22 is screwed in a portion corresponding to the adjusting piece accommodating recess 41, and an adjusting screw 23 is screwed into the screw hole 22. The tip of the adjusting screw 23 is positioned so as to abut against the back surface of the adjusting piece 42. Therefore, in the example shown in FIG. 3, by operating the adjusting screw 23 in the screwing direction, the tip end of the adjusting screw 23 pushes the back surface of the adjusting piece 42 shown by the solid line as shown by the arrow, and as a result, the adjusting is performed. The piece 42 rotates counterclockwise around the vertical axis 44 to increase the amount of protrusion from the recess 41 into the cavity 4 and reduce the effective capacity of the cavity 4.

In this embodiment, the cavity shape adjusting means of the present invention is constituted by the adjusting piece 42 provided in the adjusting piece accommodating recess 41, and the protruding amount adjusting means of the present invention is the rear surface of the adjusting piece. The adjusting screw 23 is screwed into a screw hole 22 that is screwed through the die so as to face the adjusting screw 23, and the tip of the adjusting screw 23 comes into contact with the rear surface of the adjusting piece 42.

Therefore, when the adjusting screw 23 is fastened to enter the cavity 4, the tip of the adjusting screw 23 causes the adjusting piece 4 to move.
The rear surface of 2 is pressed, the adjusting piece 42 is rotated around the vertical axis 44, the tip side thereof is pushed out into the cavity 4, and conversely, when the adjusting screw 23 is loosened, when the external force is applied from the surface side, the adjusting piece is adjusted. The piece 42 is designed to be retracted until the rear surface thereof comes into contact with the tip of the adjusting screw 23.

Since the foam molding die of the present invention is constructed as described above, the adjusting piece 23 is operated by operating the adjusting screw 23.
It is possible to change the shape of the cavity 4 by adjusting the amount of protrusion of the foam into the cavity 4, and one foam molding die 1 can be used for manufacturing a plurality of types of headrests, and particularly It is suitable as a mold for small-lot production of varieties.

Further, since the trim H2 is normally formed into a three-dimensional shape by sewing a sheet cut into a predetermined shape, there are variations in size. Therefore, when manufacturing the same type of headrest H, even if the shape of the cavity 4 is set for that type by operating the adjusting screw 23, the trim H2 is produced.
If the H is installed in the cavity 4, the trim H2
Does not always follow the inner surface of the cavity 4.

And, in particular, the trim H is more than the cavity 4.
If 2 is larger, the trim H2 becomes wrinkled and becomes a defective product at the time when the foam molding is completed. In order to eliminate such inconvenience, the cavity 4 of the trim H2
When the trim H2 is mounted inside, the fitting state of the trim H2 in the cavity 4 is made normal by visually observing the mounting state of the trim H2 and finely adjusting the protrusion amount of the adjusting piece 42 by operating the adjusting screw 23. As a result, it is possible to effectively suppress the wrinkles of the trim H2 and reliably reduce the occurrence of defective products.

FIG. 4 is a sectional view showing another example of a foam molding die. In the case of this example, a pair of left and right adjustment piece accommodating recesses 410 are provided in the upper portion of the cavity 40 of the lower mold 20 of the foam molding die 10, and the adjustment piece accommodating recesses 4 are formed.
A support shaft 440 that extends in the horizontal direction is provided in the lower part of the inside of the device 10. An adjusting piece 420 is rotatably supported around the support shaft 440.

Further, an adjusting piece 4 is provided on the upper side wall of the lower mold 20.
A screw hole 220 is screwed in a portion corresponding to 20.
An adjusting screw 230 is screwed into the screw hole 220, and the tip end of the adjusting screw 230 abuts against the back surface of the adjusting piece 420.

Therefore, in the foam molding die 10 of this example, it is possible to adjust the protruding amount of the adjusting piece 420 provided on the upper portion of the cavity 40 by operating the adjusting screw 230. By adjusting the amount, the shape of the upper portion of the cavity 40 can be changed, and wrinkling of the upper portion of the trim H2 can be effectively suppressed.

FIG. 5 is a sectional view showing another example of the cavity shape adjusting means. (A) shows a state in which the adjusting piece is supported by one protruding amount adjusting means, and (b) shows a plurality of protruding amounts. The state where the adjustment piece is supported by the adjustment means is shown, respectively. As shown in these figures, in the case of this example, the adjusting plate 42a serving as the cavity shape adjusting means has the protrusion amount adjusting means in the adjusting piece accommodating recess 41a provided in the inner wall surface of the cavity 4a of the lower mold 2a. Is provided while being supported by the shaft 23a.

A screw hole 22a, in which a female screw is screwed, is provided at an appropriate position of the lower mold 2a, and the shaft 2
A male screw is screwed on 3a, and the shaft 23a is attached to the lower die 2 with the male screw screwed into the screw hole 22a.
It is attached to a. A locking plate 23b is fixed to the end surface of the tip of the shaft 23a that is recessed in the adjustment piece accommodating recess 41a.

On the other hand, on the back side of the adjusting plate 42a, the locking plate 23 is provided inside the locking plate 23b.
A locking member 42b having a locking space 42c for housing and locking b is fixed, and the locking plate 23b is housed in the locking space 42c in the locking member 42b to lock the locking plate 23b. The adjusting plate 42a is connected to the tip of the.

Further, a thumbscrew 23c is screwed to a portion of the shaft 23a protruding from the lower mold 2a to the outside.
By tightening and loosening the thumbscrew 23c, the shaft 23
cavity 4 of the adjusting plate 42a attached to the tip of a
The amount of protrusion to a is adjusted.

According to the cavity shape adjusting means of this example, the disadvantage of the adjusting means of the previous example in that the amount of protrusion of the portion pivotally supported by the vertical shaft 44 cannot be adjusted, and the adjusting plate 42 is used.
It is possible to project and retract the entire a in the adjustment piece accommodating recess 41a, and the degree of freedom in changing the cavity shape is improved.
Particularly, as shown in FIG. 5B, the two shafts 23
When the adjustment plate 42a is supported by a, it is possible and convenient to make the shape of the cavity more appropriate by adjusting the amount of protrusion of each shaft 23a.

In the above embodiment, the protrusion amount adjusting means is formed by the adjusting screw 23 or the shaft 23a, but the protruding amount adjusting means of the present invention is not limited to the adjusting screw 23 or the shaft 23a. A rubber balloon-shaped bag body as a protrusion amount adjusting means is interposed between the wall surface of the adjustment piece housing recess 41 and the back surface of the adjustment piece 42, and compressed gas is supplied to the bag body. The amount of protrusion of the adjustment piece 42 may be adjusted by adjusting the supply amount.

[0039]

As described in detail above, the foam molding die according to claim 1 of the present invention comprises a pad material made of a foamable synthetic resin and a trim for covering the pad material. A mold for foam molding, which is integrally connected by means of the above, wherein a cavity shape adjusting means for projecting and retracting an inner wall surface of the cavity is provided at an appropriate position of the cavity of the mold.

Therefore, even if the shape of the cavity and the shape of the trim do not match, the shape of the cavity is adjusted to the shape of the trim by operating the cavity shape adjusting means so that the inner wall surface is projected and retracted. It is possible to ensure that the trim fits along the inner wall of the cavity.

Since the trim is mounted so as to be surely along the inner wall surface of the cavity in this manner, the wrinkles of the trim of the molded product caused by the conventional mismatch of the shape of the cavity and the shape of the trim are generated. Since the positional deviation is effectively suppressed, it is possible to reduce the defective rate of the molded product, which was high in the past, and as a result, it is possible to contribute to the reduction of the manufacturing cost.

According to the foam molding die of the second aspect of the present invention, since the cavity shape adjusting means is provided with the adjusting piece which is provided so as to be retractable from the cavity, this adjusting piece is used. By performing the retracting operation, the inner wall surface of the cavity can easily conform to the shape of the trim.

According to the foam molding die of the third aspect of the present invention, the adjusting piece is accommodated in the adjusting piece accommodating recess provided in the wall surface of the cavity. It is effective in smoothly forming the inner wall surface of the cavity without causing excessive protrusion in the cavity.

Further, the adjusting piece is rotatably supported on the base end side about the support shaft, and the free end side is projected and retracted from the adjusting piece accommodating recess into the cavity, so that the adjusting piece is properly supported. The amount of protrusion of the adjustment piece into the cavity on the free end side is changed by rotating the adjustment piece about the axis. Further, since the mold is provided with the protrusion amount adjusting means for adjusting the protrusion amount of the adjusting piece into the cavity on the free end side, it is possible to easily adjust it according to the trim shape by operating this adjusting means. The protruding amount of the piece can be set.

According to the foam molding die of the fourth aspect of the present invention, the protrusion amount adjusting means is screwed into a screw hole threaded through the die so as to face the rear surface of the adjusting piece. The tip of the screw is retracted into the cavity by rotating the screw forward and backward around the axis because the tip of the screw contacts the back of the adjustment piece. The protrusion amount of the adjustment piece with which the abuts is set.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an example of a foam molding die according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a partially enlarged perspective view of a main part of FIG.

FIG. 4 is a cross-sectional view showing another example of the foam molding die according to the present invention.

5A and 5B are cross-sectional views showing another example of the cavity shape adjusting means. FIG. 5A shows a state in which an adjusting piece is supported by one protruding amount adjusting means, and FIG. 5B shows a plurality of protruding amount adjusting means. The state where the adjustment piece is supported is shown respectively.

[Explanation of symbols]

 1,10 Foaming mold 2,20 Lower mold 21 Annular edge 22,220 Screw hole 23,230 Adjusting screw 3 Upper mold 31 Raw material charging hole 32 Lid 33 Bracket 34 Horizontal shaft 35 Insertion hole 4,40 Cavity 41,410 Recess 42,420 Adjustment piece 43 Bracket 5 Clamp H Headrest H1 Rod H2 Trim

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Claims (4)

[Claims] 1. A foaming mold for integrally bonding a pad material made of a foamable synthetic resin and a trim covering the pad material by a foaming treatment of a foaming raw material, wherein the cavity of the mold is in an appropriate position. The mold for foam molding is characterized in that the mold is provided with a cavity shape adjusting means for projecting and retracting an inner wall surface of the cavity. 2. The foam molding die according to claim 1, wherein the cavity shape adjusting means includes an adjusting piece that is provided so as to be retractable from the cavity. 3. The adjusting piece is accommodated in an adjusting piece accommodating recess provided in a wall surface of the cavity, and a base end side is rotatably supported around a support shaft, and by this rotation, a free end side is adjusted. 3. The foam molding according to claim 2, further comprising projection amount adjusting means for adjusting a projection amount into the cavity on the free end side, the projection amount being configured to project from and retract into the cavity from the one-side receiving recess. Mold. 4. The protrusion amount adjusting means includes a screw hole threaded through the mold so as to face the back surface of the adjusting piece, and a screw hole screwed into the screw hole and having a tip portion on the back surface of the adjusting piece. The mold for foam molding according to claim 3, characterized in that it comprises an adjusting screw that abuts against the mold.