JPH07156152A - Venting metal fitting of foaming mold for urethane foam - Google Patents

Abstract

PURPOSE:To provide the venting metal fitting capable of replacing a venting metal net in a short time by a simple operation. CONSTITUTION:Since a metal net receiving ring 2 holding a metal net 3 and a metal net press ring 5 are fixed to the outer frame 1 fixed to an upper mold 12 through an intermediate elastic frame 4, the metal net 3 can be simply attached and detached. Therefor, when a foaming mold for urethane foam is disassembled, the replacement of the metal net 3 can be performed within a short time by simple operation. Since the metal net receiving ring 2 is fitted to the stepped par 43 of the intermediate elastic frame 4, the fitted metal net 3 can sufficiently withstand foaming pressure. Since the attachment processing of the metal net is not required even when the metal net is newly produced, the production time of a mold is greatly shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degassing fitting for a foaming mold for urethane foam.

[0002]

Urethane foam foams make use of the evolution of gas which occurs during the polymerisation process of polymers. In the conventional urethane foam foam molding method, after the urethane raw material is injected into the lower mold, the upper mold covers and foams and solidifies, but since the upper mold and the lower mold are in close contact with each other, depending on the gas generated. , Gas is accumulated in the upper part of the upper mold, and the molded product runs out of thickness.

Therefore, conventionally, a metal mesh is fitted in a region where the upper mold gas is accumulated, a hole for degassing is formed in a honeycomb shape, or a filter made of a sintered metal or the like is fitted. Came.

[0004]

However, while the mold for urethane foam foam molding is used several times,
Since the foamed urethane is always in contact with the degassing wire mesh and the air vent hole, clogging of the urethane occurs. In this way, when clogging occurs, there is no escape area for gas, and punctures or the like occur in urethane, resulting in product defects. Therefore, the foaming mold for urethane foam was removed from the production line to replace the clogged wire mesh, but it took a lot of time to replace the wire mesh, which hindered productivity.

The present invention has been made in order to solve the above-mentioned problems of degassing a conventional foaming mold for urethane foam, and replaces a wire mesh filled with urethane with a simple operation in an extremely short time. An object of the present invention is to provide a foaming mold degassing metal fitting for urethane foam which can be manufactured.

[0006]

DISCLOSURE OF THE INVENTION A gas vent fitting for a foam molding die for urethane foam according to the present invention comprises an outer groove into which an upper die of the foam molding die fits, and an inner groove into which an intermediate elastic frame fits. An intermediate portion having an outer frame having a groove, and a step portion which is in close contact with the inner circumference of the outer frame and has a protrusion for fitting in the inner groove of the outer frame on the outer peripheral surface and a step portion for fitting the wire mesh receiving ring on the inner peripheral surface An elastic frame, a wire mesh receiving ring which is provided on the inner circumference of the lower end to receive the wire mesh, and is fitted to the step portion of the intermediate elastic frame; a wire mesh fitted to the projecting edge of the wire mesh receiving ring; The gist of the invention is that it comprises an elastic frame and a wire mesh holding ring that is fitted inwardly on the wire mesh receiving ring to fix the wire mesh between the projecting edges.

[0007]

[Function] Since an outer groove is provided on the outer peripheral surface of the outer frame,
When casting the upper mold, when the outer frame is placed in a region where the gas of the upper mold is collected and is cast around the upper mold, a part of the upper mold fits into the outer groove of the outer frame, and the outer frame is Fixed in the desired position. In addition,
The outer groove of the outer frame does not have to be a concave groove, and a ridge may be provided instead of the outer groove and fitted into the upper mold. Alternatively, a male screw may be provided on the outer peripheral surface of the outer frame, and a female screw may be machined on the upper die to screw the outer frame.

The intermediate elastic frame is made of an elastic body having heat resistance and chemical resistance, such as silicon rubber. The outer peripheral surface of the intermediate elastic frame is in close contact with the inner peripheral surface of the outer frame, and the ridges on the outer peripheral surface fit into the inner grooves provided on the inner peripheral surface of the outer frame, so that the intermediate elastic frame is fixed to the outer frame. Also, on the inner peripheral surface of this intermediate elastic frame,
A step portion is provided which is recessed by the thickness of the wire mesh receiving ring, and a wire mesh holding ring is detachably fitted to the step portion.

Since the wire mesh receiving ring fitted to the step portion of the intermediate elastic frame is provided with a projecting edge for receiving the wire mesh on the inner periphery of the lower end, the wire mesh is fitted to this projecting edge. In addition, the wire mesh holding ring is inscribed and fitted to the intermediate elastic frame and the wire mesh receiving ring and fixes the wire mesh between the wire mesh holding ring and the projecting edge of the wire mesh holding ring. In this way, since the wire mesh receiving ring and the wire mesh holding ring holding the wire mesh are fixed to the outer frame through the intermediate elastic frame, they can be easily attached and detached. Wire mesh can be replaced in a short time with simple operation. Further, since the wire mesh receiving ring is fitted to the step portion of the intermediate elastic frame, the attached wire mesh can sufficiently withstand the foaming pressure.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a sectional view of a foaming mold for urethane foam. An upper die 12 is placed on the lower die 10 and hermetically sealed, and a gas vent metal fitting 14 is attached to a product surface of the upper die 12 which is a convex portion of the product shape.

FIG. 1 is a cross-sectional view of a degassing fitting mounted on the upper die 12 according to an embodiment of the present invention. The outer frame 1 is a ring made of metal, and an outer groove 11 is provided on the outer peripheral surface of the outer frame 1. By casting the upper mold 12 and a part of the upper mold 12, the outer frame 1 is fitted into the outer groove 11. The outer frame 1 is fixed to the upper mold 12. An inner groove 13 is provided on the inner peripheral surface of the outer frame 1.

The intermediate elastic frame 4 is made of an elastic material such as silicon rubber having heat resistance and chemical resistance. The outer peripheral surface of the intermediate elastic frame 4 is in close contact with the inner circumference of the outer frame, and the outer peripheral surface projects. Since the strip 41 is fitted into the inner groove 13 provided on the inner peripheral surface of the outer frame 1, the intermediate elastic frame 4 is fixed to the outer frame 1. Further, a step portion 43 recessed by the thickness of the wire mesh receiving ring is provided on the inner peripheral surface of the intermediate elastic frame 4, and the step portion 43 is provided.
A wire mesh receiving ring 2 is detachably fitted in the.

On the inner circumference of the lower end of the wire mesh receiving ring 2 fitted in the step portion 43 of the intermediate elastic frame 4, there is a projecting edge 21 for receiving the wire mesh.
Is provided, and the wire mesh 3 is fitted to the projecting edge 21. Further, the wire netting retaining ring 5 is inscribed and fitted to the intermediate elastic frame 4 and the wire netting receiving ring 2 and fixes the wire netting 3 between the wire mesh receiving ring 2 and the projecting edge 21 of the wire netting receiving ring 2.

As described above, since the wire mesh receiving ring 2 and the wire mesh pressing ring 5 holding the wire mesh 3 are fixed to the outer frame 1 via the intermediate elastic frame 4, they can be easily attached and detached. That is, in FIG. 1, the wire mesh receiving ring 2 holding the wire mesh 3 and the wire mesh holding ring 5 are connected to the intermediate elastic frame 4 in the A direction.
It can be installed by pushing it in, and the wire mesh receiving ring 2 and the wire mesh holding ring 5 that hold the installed wire mesh 3
Can be easily removed by pushing in the B direction after separating the upper mold 12.

Therefore, when the foam molding die for urethane foam is disassembled, the wire net 3 can be replaced in a short time by a simple operation. Further, since the wire mesh receiving ring 2 is fitted in the step portion 43 of the intermediate elastic frame 4, the attached wire mesh can sufficiently withstand the foaming pressure.

Although the outer frame 1 is provided with the outer groove 11 in the present embodiment, it is not always necessary to form the outer groove 11, and the outer groove 1 may be a ridge. Alternatively, the outer frame 1 may be fixed to the upper mold 12 by providing a male screw on the outer peripheral surface and screwing it into the upper mold. Further, the inner groove 13 may also be a ridge likewise.

[0017]

As described above in detail, the gas vent fitting of the urethane foam foaming mold of the present invention has the wire mesh receiving ring and the wire mesh holding ring holding the wire mesh fixed to the outer frame through the intermediate elastic frame. Since it can be easily attached and detached, when the urethane foam foaming mold is disassembled,
Wire mesh can be replaced in a short time with simple operation. Further, since the wire mesh receiving ring is fitted to the step portion of the intermediate elastic frame, the attached wire mesh can sufficiently withstand the foaming pressure. Further, even if a wire mesh is newly manufactured, the wire mesh does not need to be attached, so that the mold manufacturing time is significantly shortened.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a urethane foam foaming mold.

[Explanation of symbols]

 1 Outer Frame 11 Outer Groove 13 Inner Groove 2 Wire Mesh Receiving Ring 21 Projection Edge 3 Wire Mesh 4 Intermediate Elastic Frame 41 Projection 43 Stepped portion 5 Wire Mesh Retaining Ring 10 Lower Die 12 Upper Die 14 Venting Metal

Claims (4)

[Claims] 1. An outer frame having an outer groove into which an upper die of a foaming mold fits and an inner groove into which an intermediate elastic frame fits, and an outer frame which is in close contact with the inner circumference of the outer frame. An intermediate elastic frame having a projection that fits in the inner groove of the outer frame and a step portion on the inner peripheral surface into which the wire mesh receiving ring fits; and an intermediate elastic frame that has a protruding edge for receiving the wire mesh on the inner periphery of the lower end. Of the wire mesh receiving ring fitted to the step portion, the wire mesh fitted to the projecting edge of the wire mesh receiving ring, the intermediate elastic frame and the wire mesh receiving ring inscribed to fit the wire mesh. A degassing metal fitting for a foaming mold for urethane foam, which comprises a wire mesh retaining ring fixed between the edges. 2. The degassing fitting for a foam molding die for urethane foam according to claim 1, wherein the outer peripheral surface of the outer frame is a ridge that is fitted into the upper die of the foam molding die. 3. The degassing fitting for a foam molding die for urethane foam according to claim 1, wherein an inner peripheral surface of the outer frame is a ridge that is fitted into the intermediate elastic frame. 4. The degassing fitting for a foam molding die for urethane foam according to claim 1, wherein the outer periphery of the outer frame is a male screw that is screwed into the upper die of the foam molding die.