JPH0780861A - Foam molding tool - Google Patents

Abstract

PURPOSE:To provide a foam molding tool useful for prevention of accidents by a method wherein the safety at deburring work is maintained. CONSTITUTION:In the foam molding tool concerned, a top mold 2 is joined by means of a hinge 3 to one side edge of a bottom mold 1. On the top surface of the top mold 2, a vent hole 22 is bored. On the top mold 2, a handle guide member 5 having a through hole 53 is provided so as to rockingly hang a suspender, at the lower end of which an angle is formed, onto an opening and closing handle 7, which is loosely inserted in the through hole 53 and the basic end part 72 of which is supported by means of the hinge 3. Further, by fixing a stopper 6, which engages with the angle of the suspender 8, to the top mold 2 side when the opening and closing handle 7 is pivoted to the predetermined angle, the loosely inserted state of the opening and closing handle to the through hole 5 is hampered through the above-mentioned engagement.

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 molding a foam such as urethane foam.

[0002]

2. Description of the Related Art Foams such as urethane foam generate gas during molding. Therefore, as a foaming mold used for molding a foam, a foaming mold having several gas vent holes with a diameter of about 5 mm formed on the upper surface of the upper mold has been mainly used. However, when the above foam molding die was used, not only the unnecessary gas but also the raw material during foaming leaked from the gas vent hole during foam molding. The foam that leaked and solidified around the gas vent hole became a lump and adhered firmly to the upper mold, and the removal work was difficult. In order to improve such a problem, the applicant of the present invention has already proposed a foam molding die provided with a plug body that fits in the gas vent hole with a slight gap left (Japanese Utility Model Publication No. 61-158412).

[0003]

However, the foam molding die (FIG. 6) has a problem in working. First, at the time of demolding, the funnel-shaped burr 93 was not always formed only on the foam body 94 side. The burr 93 also remained in the fitting gap between the gas vent hole 95 and the plug body 96, depending on the shape of the cavity, the foaming raw material, and the like. In such a case, the arm 9
7 is lifted to remove the burr 93 attached to the fitting gap, but the upper mold 99 is only pulled up by the engagement of the guide 98 and is in an unstable state. Arm 97
Is loosely inserted in the long hole 981 provided in the guide 98,
Even when the arm 97 was in the home position, the upper mold 99 moved upward (chain line in FIG. 6). Therefore, if you try to reach out and remove the burr, you should push the upper mold 99 with your hand
If you touch the chest, the upper mold will rise and the gas vent hole 95
There was a danger that I would get stuck in my hand.

The present invention solves the above problems, and an object of the present invention is to provide a foaming mold which ensures safety during deburring work and helps prevent accidents.

[0005]

The foaming mold of the present invention comprises:
In a foam molding die in which an upper die is hinge-joined to one side edge of the lower die and a gas vent hole is formed in the upper die upper surface, a handle guide member having a through hole is provided in the upper die, and this through hole is provided. When a pendant having a corner at its lower end is swingably hung on the opening / closing handle whose base end is supported by the hinge and is swingable, and the opening / closing handle is further rotated to a predetermined angle, the upper die By fixing a stopper that engages with the corner portion of the pendant to the side, the engagement of the opening / closing handle with respect to the through hole is prevented by the engagement.

[0006]

When foam molding is performed using the foam molding die according to the present invention, burrs are generated around the gas vent hole. When a burr is generated in the fitting gap, when the opening / closing handle is lifted up to a predetermined angle, the opening / closing handle is loosely inserted in the through hole, so that the opening / closing handle and the upper mold are separated from each other to some extent. At the same time
Since the corner portion of the pendant engages with the stopper, the upper mold is fixed, and even if a force in the upward direction is applied to the upper mold, lifting is prevented. Thus, the burr adhering to the gas vent hole can be safely removed.

[0007]

EXAMPLES The present invention will be described in detail below based on examples. 1 to 5 show an embodiment of a foaming mold according to the present invention. Fig. 1 is a cross-sectional view of the foam molding die when the open / close handle is loosely inserted in the through hole when the foam is cured. Fig. 2 is an enlarged perspective view of the pendant and its surroundings. 4 is an explanatory view showing the positional relationship between the pendant and the stopper when the mold is opened, and FIG. 5 is a cross-sectional view of the foaming mold when the mold is opened.

Reference numeral 1 is a lower mold, and reference numeral 2 is an upper mold. The upper mold 2 is joined to the hinge 3 at one side edge of the lower mold 1, and the upper mold 2 is supported by the spindle 3.
It is rotatable around 1. When the upper mold 2 is closed, the product-shaped cavity 4 is formed. The upper mold 2 has a concave portion 21 for forming a convex portion of the product above the mold matching surface (FIG. 1). On the upper surface of the upper mold 2, a gas vent hole 22 penetrating to the cavity 4 side of the recess 21 is formed.

Reference numeral 5 indicates a handle guide member provided near the front surface (right side in FIG. 1) of the upper mold 2. The handle guide member 5 includes a plate body 51 and a locking member 52. Plate-like body 51
A U-shaped notch groove 511 having an open upper end is provided in the (FIG. 2). The locking member 52 is a split ring having a slit 521 in the height direction of the peripheral wall of the short tube and having a substantially C-shaped cross section, and is rotatable as shown in FIG.
The width of the slit 521 of the locking member 52 is wider than the thickness of the lever 7b of the opening / closing handle 7 described later (FIG. 2). Here, when the slit 521 of the locking member 52 is turned down, the locking member 52
The notch groove 511 forms a vertically long through hole 53. The lever 7b is loosely inserted into the through hole 53. By the way, after the lever 7b is inserted into the ring of the split ring which is the locking member 52, when the locking member 52 is rotated 180 degrees, the slit 521 comes right above and the lever 7b can be taken out ( (Figure 6).

Reference numeral 6 indicates a stopper composed of an angle 61 having an L-shaped cross section and a strip plate 62. The stoppers 6 are welded and fixed to gussets 54 provided on both side edges of the plate-like body 51 (FIG. 2). Two strips 62, 62 are extended from the position of the gusset 54 over the lever 7b and in parallel with the lever 7b in the direction of the support shaft 31, and an angle 61 is attached to the tip of the strips 62 in a forward tilted posture (Fig. 2, FIG. 3). The angle 61 in the forward tilted posture is such that when the upper die 2 is lifted up to a predetermined angle (a little less than 40 degrees in this embodiment) about the support shaft 31,
The right angle planes of the angle 61 form vertical planes and vertical planes (Figs. 4 and 5). Then, when this state is reached, the corner portion 83 of the pendant 8 to be described later becomes
It is the structure which contacts both right-angled surfaces.

The open / close handle 7 is composed of a plate-shaped portion 7a to which a plug 71 fitted in the gas vent hole 22 is fixed, and a rod-shaped lever 7b welded and fixed to the upper side of the plate-shaped portion 7a. The plate-shaped portion 7a is a substantially rectangular plate, and the base end portion 72 thereof is rotatably supported by the support shaft 31 of the hinge 3. When the plate-shaped portion 7a is placed on the upper mold 2, the plate-shaped portion 7a has a plug body 71 at a position facing the gas vent hole 22.

The plug body 71 is a cylindrical body having a tapered tip, and when fitted into the gas vent hole 22, the gas is passed through the fitting gap to cause the gas to pass through the fitting gap and the cavity 4 is filled with the foaming raw material. To escape from the system. However,
The foaming raw material itself is set so that its escape is prevented, or even if it can escape through the gap, it becomes a thin skin. The gap formed by fitting the stopper 71 and the gas vent hole 22 is about 1 to 100 μm. The porosity is selected according to the foaming raw material, the type of target product, and the like. Lever 7
b is a rod-shaped body having a grip 73 at the tip. The lever 7b is loosely inserted into the through hole 53, and is fixed to the plate-like portion 7a at two places of its root portion (FIG. 1).

Reference numeral 8 denotes a vertically elongated pendant suspended from a lever 7b near the handle guide member 5. Pituitary 8
The pin 82 is inserted through a hole provided in the lower portion of the U-band 81 fixed to the lever 7b, pivotally supported by the pin 82, and is swingably mounted. A right angled corner portion 83 is formed at the lower end of the pendant 8. This is because when the pendant body 8 is rounded without having the corners 83 when it is engaged with the stopper 6, the pendant body 8 rotates about the pin 82 as a fulcrum and the upper die cannot be fixed. . The pendant body 8 is arranged between the handle guide member 5 and the stopper 6 when the opening / closing handle 7 is placed on the upper mold 2 and the plug body 71 and the gas vent hole 22 are fitted to each other (FIG. 1). , Fig. 3). Then, when the open / close handle 7 is lifted up to an angle of about 40 degrees, the upper mold 2 is also lifted, and the L-shaped stopper 6 having a horizontal surface and a vertical surface is formed.
The corner portion 83 of the pendant 8 fits into the pendant 8 to engage with it.

Reference numeral 91 indicates a U-shaped clamp, and reference numeral 92 indicates a clamp stopper 92. It is for clamping the mold when it is closed. Reference numeral a indicates a foam-molded article manufactured by the foam-molding die.

In the foam molding die having such a structure, when the open / close handle 7 is loosely inserted into the through hole 53 and lifted, the upper mold 2 is also rotated to follow the mold open state. Since the opening / closing handle 7 is loosely inserted in the through hole 53, the upper mold 2 is separated from the opening / closing handle 7 by its own weight and is tilted to a position where it is locked at the upper edge of the through hole 53 (FIG. 5). .
Then, the gas vent hole 22 comes to be disengaged from the plug body 71, which makes it easy to remove the thin skin-like burr that has entered the fitting gap between the gas vent hole 22 and the plug body 71 during foam molding.

On the other hand, in parallel with the above operation, when the opening / closing handle 7 is lifted up to a predetermined angle (about 40 degrees),
Since the pendant 8 always maintains the suspended state with the pin 82 as the fulcrum,
The corner portion 83 is sucked into the angle 61 which is kept vertical and horizontal at an angle of about 40 degrees. Thus, the pendant 8 and the stopper 6 are engaged. Since the corner portion 83 is in perfect contact with the right angle portion of the angle 61,
The pendant 8 suspended from the pin 82 as a fulcrum is also fitted to the angle 61, and the play by the through hole 53 is eliminated. The contact resistance with the angle 61 is large due to the formation of the corner portion 83, and the pendant body 8 engaged in this state does not rotate about the pin 82 as a fulcrum. Therefore, under such engagement, if the open / close handle 7 is held in a fixed position by a hand or the like, the upper mold 2 cannot be lifted up, the loose insertion state of the through hole 53 is prevented, and it is as if the lock is applied. Become. Therefore, as before,
There is no problem that the upper mold 2 rattles, and the gas vent hole 2
2. It is possible to concentrate on deburring the plug 71. Even if it is removed with fingers, there is no danger of being caught in the plug body 71.

By the way, when the opening / closing handle 7 is lowered after the deburring work is completed, the pendant 8 and the stopper 6 have different radii of curvature about the support shaft 31, and therefore engage with the angle 61. The pitted body 8 that has been trying to jump out from the angle 61 forward (to the left in FIG. 4). That is, the pendant 8 is in a state of being suspended from the pin 82, and as the turning angle of the opening / closing handle becomes smaller, the pendant 8 straightens the bending with respect to the U band 81 and tries to move forward. Further, the angle 61 of the stopper 6 tends to take a forward leaning posture as the angle of the opening / closing handle becomes smaller, so that the pendant body 8 is prevented.
You can also press from behind.

As described above, when the deburring work is performed by lifting the opening / closing handle 7, the stopper 71 is attached to the gas vent hole 2.
After removing from 2, and fixing the upper mold 2 so as not to move, when the open / close handle 7 is lowered after the work, the lock state of the open / close handle 7 of the upper mold 2 is automatically released, and the open / close handle is The state loosely inserted in the through hole 53 is restored again. In this way, no additional operation or the like for ensuring safety is required, which not only leads to labor saving, but also eliminates the fear of accidents caused by forgetting the operation. Workers can now engage in deburring work during the demolding process with peace of mind. By engaging the pendant 8 and the stopper 6 as described above, deburring can be quickly performed only by the lifting operation of the opening / closing handle 7 at the time of demolding, without lowering productivity.

Here, the deburring work is performed in a continuous production process, and when burrs adhere to the upper surface of the plate-shaped portion 7a which is out of reach, the slit 521 is directly above the manufacturing end. And move the lever 7b away from the upper mold 2 to deal with it.

The shape, size, etc. of the handle guide member 5, the stopper 6, the opening / closing handle 7, and the pendant 8 are not limited to those shown in the above embodiment, but may be varied within the scope of the present invention depending on the purpose and application. Can be changed. Further, the angle of the open / close handle with which the pendant 8 and the stopper 6 are engaged is not limited to the numerical value of the embodiment, and various values can be selected.

[0021]

As described above, in the foam molding die according to the present invention, only by attaching the pendant and the stopper, the upper die is automatically locked so as not to move during deburring without any special operation. Therefore, it is effective in ensuring the safety of deburring work.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a foam molding die that has completed foam molding.

FIG. 2 is an enlarged perspective view around the pendant.

FIG. 3 is an explanatory diagram showing a positional relationship between a pendant and a stopper when the mold is closed.

FIG. 4 is an explanatory view showing a positional relationship between a pendant and a stopper when the mold is opened.

FIG. 5 is a cross-sectional view of the foaming mold when the mold is opened.

FIG. 6 is an explanatory sectional view of a conventional technique.

[Explanation of symbols]

 1 Lower mold 2 Upper mold 22 Gas vent hole 3 Hinge 5 Handle guide member 53 Through hole 6 Stopper 7 Open / close handle 72 Base end 8 Pendant 83 Corner

Claims (1)

[Claims] 1. A foam molding die in which an upper die is hinge-joined to one side edge of a lower die and a gas vent hole is formed in an upper surface of the upper die.
A handle guide member having a through hole is provided in the upper mold, and a pendant having a corner at the lower end is swingably suspended to an opening / closing handle that is loosely inserted into the through hole and has a base end supported by the hinge. Installed, and when the open / close handle is rotated to a predetermined angle,
A foam molding die, wherein a stopper that engages with a corner portion of the pendant is fixed to the upper die side so that the engagement of the opening / closing handle with respect to the through hole is prevented by the engagement.