JP3431230B2 - Foam mold - Google Patents

Description

Description: 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] Foams such as urethane foams generate gas when molded. Therefore, as a foaming mold used for molding a foam, one having several gas vent holes having a diameter of about 5 mm on the upper surface of the upper mold has been mainly used. However, when the above-mentioned foaming mold was used, not only the unnecessary gas but also the raw material being foamed leaked from the vent hole during foaming. The foam solidified around the vent hole was solidified and adhered to the upper mold in a lump, and the removal operation was difficult. In order to improve such disadvantages, the present applicant has already proposed a foam molding die provided with a plug that fits with a small gap left in the gas vent hole (Japanese Utility Model Laid-Open No. 61-158412). [0003] However, the foam molding die (FIG. 7) has a problem in operation. First, at the time of demolding, the funnel-shaped burrs 93 are not always formed only on the foam 94 side. Depending on the shape of the cavity, the type of the foaming material, and the like, the burr 93 also remained in the fitting gap between the gas vent hole 95 and the plug 96. In such a case, the arm 97
Is lifted to remove burrs adhering to the fitting gap, but the guide 98 for assisting the rotation of the arm 97 rather obstructs the operation, and the operation was not completed. In addition, if the arm 98 falls down due to some momentum during the work, there is a danger that the finger may be caught between the plugs and injured. An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a foaming mold that contributes to an increase in work efficiency while ensuring work safety. [0005] The foaming mold of the present invention comprises:
An upper mold is hinged to one side edge of a lower mold and a gas vent hole is formed in an upper surface of the upper mold. In the foam molding mold, a handle guide member in which a cutout groove having an upper end opening is provided in the upper mold is projected. The opening and closing handle having a base end supported by the hinge is loosely inserted into a through hole formed by the engaging member and the notch groove, and the opening and closing is performed. By fixing the plug that fits into the gas vent hole on the handle,
The plug is detached from the gas vent hole due to the play of the opening / closing handle, and only the opening / closing handle is rotatable from the upper mold by releasing the blocking of the locking member. Here, "blocking the upper part of the notch groove" means closing the upper end opening of the notch groove so that the through hole is formed by the notch groove and the blocking member. When foaming is carried out using the foaming mold according to the present invention, a fitting gap is formed between the gas vent hole and the plug so that gas can pass therethrough but the foam cannot pass easily. As a result, skin-like burrs that are easily removed are generated. After the foam molding, when the opening / closing handle loosely inserted into the through hole is lifted in the demolding step, the stopper is fixed to the opening / closing handle, so that the stopper slightly rises from the gas vent hole. Therefore, even if burrs remain on the gas vent hole side, they can be efficiently blown off by compressed air or the like. On the other hand, if the burrs accumulate and stick around the gas vent hole, release the blocking of the locking member and separate the open / close handle from the upper mold, and the upper mold upper surface will be in an open state, making it easier to work. The burrs that have stuck firmly can be removed without difficulty. Hereinafter, the present invention will be described in detail with reference to examples. 1 to 6 show one embodiment of a foaming mold according to the present invention. FIG. 1 is a cross-sectional view of a foaming mold at the time of foam hardening in which an opening / closing handle is loosely inserted into a through hole, FIG. 2 is a view showing an attachment of a locking member to a handle guide member, FIG. 3 is an exploded perspective view of FIG.
4 is a front view of FIG. 2, FIG. 5 is a state diagram when the mold is removed, and FIG. 6 is a view in which the opening / closing handle is separated from the upper mold. Reference numeral 1 denotes a lower mold, and reference numeral 2 denotes 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
1 is freely rotatable. When the upper mold 2 is closed, a 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. A gas vent hole 22 is formed in the upper surface of the upper mold 2 so as to penetrate the cavity 21 toward the cavity 4. Reference numeral 5 denotes a plate-like handle guide member provided near the front surface (right side in FIG. 1) of the upper die 2. The handle guide member 5 is provided with a U-shaped notch groove 51 whose upper end is open (FIG. 3). An upper portion of the notch groove 51 has an arc-shaped concave portion 52,
52 are recessed at opposing positions. This is because the next locking member 6 is rotatably mounted by utilizing the concave portion 52. The locking member 6 is formed of a split ring having a slit 61 in the height direction of the peripheral wall of the short tube and having a substantially C-shaped cross section (FIG. 2). The locking member 6 has a central portion 62 made of a smaller tube diameter than both sides. The handle guide member 5
And the central portion 62 is fitted into the concave portions 52, 52,
Thereafter, the lower end portion 53 is welded to make the locking member 6 rotatable, and moreover, is integrated with the handle guide member 5. The width of the slit 61 of the locking member 6 is wider than the thickness of the lever 7b of the opening / closing handle 7 described later (FIG. 4). When the lever 7b is loosely inserted into the vertically long through hole 8 formed by the locking member 6 and the notch groove 51 with the slit 61 of the locking member 6 facing downward, the upper wall of the locking member 6 is moved. 63
Cuts off the notch groove 51, and the lever 7b is restricted to vertical movement in the through hole 8 (FIG. 2). Specifically, the lever 7b
Can only move vertically about 50 mm with respect to the upper mold 2. On the other hand, after the lever 7b is inserted into the ring of the split ring, which is the locking member 6, when the locking member 6 is rotated by 180 degrees, the slit 61 comes directly above and the cutoff groove 51 of the locking member 6 is blocked. The lever 7b is released so that only the lever 7b can be taken out (FIG. 6). Reference numeral 64 indicates a knob. This is to facilitate the rotation of the locking member 6. The opening / closing handle 7 comprises a plate-like portion 7a to which a plug 71 fitted into the gas vent hole 22 is fixed, and a rod-like lever 7b welded and fixed to the upper side of the plate-like portion 7a. The plate-like portion 7 a is a substantially rectangular plate, and its base end 72 is rotatably supported by the support shaft 31 of the hinge 3. When the plate-shaped portion 7 a is placed on the upper mold 2, the plate-shaped portion 7 a has a plug 71 at a position facing the gas vent hole 22. The plug body 71 is a cylindrical body having a tapered tip. When the plug body 71 is fitted into the gas vent hole 22, gas flows through the fitting gap at a pressure at which the foaming material foams and fills the fitting surface. To escape from the system. However,
The foaming raw material itself is set so that its escape is prevented, and even if it escapes through the gap, it becomes a thin skin. The gap formed by fitting the plug 71 and the gas vent hole 22 is about 1 to 100 microns. The degree of the gap is selected according to the type of the foaming raw material, the target product, and the like. In the present embodiment, one plug 71 is fixed to the plate-shaped portion 7a, but the number is appropriately increased according to the shape and size of the cavity 4 and the concave portion 21. The gas vent holes 22 are formed in the upper mold 2 in accordance with the number of such plugs 71. The lever 7b is a rod having a grip 73 at the tip. The lever 7b is loosely inserted into the through hole 8,
It is fixed to the plate-like portion 7a at two locations at its root (FIG. 1). Then, the grip 73 is disposed so as to protrude further forward than the front surface of the upper mold 2. Thus, the upper mold 2 and the opening / closing handle 7 are rotatable about the support shaft 31 with respect to the lower mold 1, but are integrated with the lower mold 1 by the support shaft 31. Reference numeral 91 denotes a U-shaped clamp. Four locations can be attached to the front of the lower mold 1. Clamping stoppers 9 are provided at two places on the front face of the upper mold 2 and two places on the front face of the plate-shaped portion 7a.
2 are provided. The clamp 91 is for clamping the mold when the mold is closed. The symbol a indicates a foam molded product made by the present foam molding die. [0016] The foaming mold thus configured is usually
The clamp 91 is hung on each of two places of the upper mold 2 and the plate-shaped portion 7a, and the mold is clamped. If the clamp 91 of the plate-shaped portion 7a is removed while the upper mold 2 is closed, the plate-shaped portion 7a moves up and down by about 50 mm. Since it can move, the gas at the time of foam molding can be released more smoothly. If a large amount of burrs adhere around the gas vent hole 22 and the gas venting operation deteriorates, the opening / closing handle 7 is moved into the split ring of the retaining member 6 and the retaining member 6 is rotated by 180 degrees.
Since the opening / closing handle 7 is opened from the upper die 2 when the slit 61 comes to the upper position, the burr fixed around the gas vent hole 22 can be efficiently removed (FIG. 6). When the opening / closing handle 7 is completely tilted backward, safe work is ensured. There is no danger of being pinched by the plug 71 even if it is removed with fingers. Even if thin burr-like burrs adhere to the gas vent hole 22 and the plug 71, most burrs can be blown off by using compressed air or the like in each cycle of the manufacturing process. That is, when the upper mold 2 is lifted by the opening / closing handle 7 at the time of removing the mold, the opening / closing handle 7 is loosely inserted into the through hole 8, so that the upper mold 2 is separated from the opening / closing handle 7 by its own weight. Is removed from the plug 71, so that the burr is more easily peeled off (FIG. 5). By the way, the opening / closing handle 7 lifts the upper die 2 while contacting the locking member 6, but in this embodiment, the locking member 6 is constituted by a split ring, and the upper side wall 63 is in contact with the ring. Excellent strength and durable. Notch groove 51
When a horizontal member such as a bar is used to interrupt the air flow, a concentrated load crossing the bar is applied substantially in the center of the bar, so that the rod is easily bent, but such a problem does not occur. Further, in FIG. 4, when the locking member 6 is rotated with respect to the opening / closing handle 7 loosely inserted into the through hole 8 so that the slit 61 is at the upper position, the vertical movement range of the opening / closing handle 7 is minimized, and 91 and the above 5
It can be adjusted to a substantially intermediate range from the loosely-fitted state, which moves up and down about 0 mm. In this way, it is possible to make adjustments corresponding to subtle changes in molding conditions. The shape, size and the like of the handle guide member 5, locking member 6, and opening / closing handle 7 are not limited to those described in the above embodiment, but can be variously changed within the scope of the present invention depending on the purpose and application. . As described above, the foaming mold according to the present invention can ensure a safe operation, and the opening / closing handle can play in the through hole formed by the engagement between the handle guide member and the locking member. While being able to maintain the inserted state, it is removable with respect to the upper mold, so that burrs around the gas vent hole can be easily removed,
Demonstrates excellent effect on workability improvement.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a foam mold after foam molding. FIG. 2 is a perspective view showing an attachment state of a locking member to a handle guide member. FIG. 3 is an exploded perspective view of FIG. 2; FIG. 4 is a front view of FIG. 2; FIG. 5 is a cross-sectional view showing a state at the time of demolding. FIG. 6 is a cross-sectional view showing a state in which an opening / closing handle is separated from an upper mold. FIG. 7 is an explanatory sectional view of a conventional technique. [Description of Signs] 1 Lower die 2 Upper die 22 Gas release hole 3 Hinge 5 Handle guide member 51 Notch groove 6 Locking member 7 Open / close handle 71 Through hole 72 Base end

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-2919 (JP, U) JP-A-4-94414 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B29C 39/00-39/44 B29C 33/00-33/76

Claims (1)

(1) A foam molding die having an upper die hinged to one side edge of a lower die and a gas vent hole formed in an upper surface of the upper die.
The upper die is provided with a handle guide member having a cutout groove having an upper end opening, and a locking member for blocking an upper portion of the cutout groove is attached, and a through hole formed by the locking member and the cutout groove is provided. Open and close the open / close handle with the base end supported by the hinge,
By fixing the plug that fits into the gas vent hole to the open / close handle, the plug comes off the gas vent hole due to the play of the open / close handle, and only the open / close handle from the upper mold is released by releasing the locking member. A foaming mold configured to be rotatable.