JPS586613Y2 - Heat-retaining hot water pack - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat-generating heat-retaining puncture for a riser with the purpose of improving the heat-retaining effect of the riser.

Generally, when casting metal, a riser is supplied to replenish the molten metal against solidification and shrinkage of the metal, but this must be done effectively and economically.

For this purpose, various methods and forms have been proposed in the past.

For example, there are spherical feeders, exothermic agents molded into sleeves, and blind feeders (side feeders) with a rod-shaped core inserted into the head.

However, even if they are said to be economically effective, a careful calculation may show that they are not worth the cost.

Furthermore, since many of them cannot be used immediately in any product, they are generally not used very often, and the current situation is that ordinary methods of replenishing molten metal are used.

There are two types of molten metal used in metal casting: open type and blind type, and the open type feeder has a heat generating agent added to it in the form of a granular mixture, and although it has an effect of causing dust, 1 is not enough.

In the case of blind type feeders, heat dissipation from the head is small, so spherical feeders made of styrene, molded heat generating agents, spherical feeders with a built-in heat generating agent, etc. are quite effective, but their installation methods are cumbersome. However, the price is high, so there is no economic benefit.
This is also not used much.

In addition, in order to fully exhibit the heat retention effect of the feeder, powder and granular materials are more effective than these solid materials, but powder and granular materials have the disadvantage of not being moldable, so the required shape cannot be obtained. be.

This invention solves the above problems,
This provides a riser heat-generating and heat-retaining puncture in which a layer of granular heat-generating agent is wrapped with aluminum foil to form a substantially disk shape, and a bulge is provided at the top of the layer.

This will be explained below with reference to the drawings. In Fig. 1, the pack 1 of the present invention is formed by covering a layer 2 of a commercially available powder heat generating agent with an aluminum foil 3 to form a substantially disk shape, and the top center portion The structure includes a cutout 4, the shape of which can be changed as appropriate depending on the cross section of the feeder.

The tabs 14 can be formed by folding the ends of the wrapped aluminum foil.

The layer thickness of the heat generating agent in this thermal insulation flat is usually 3 to 1 OIILm.
It is.

For example, if the shape of the riser is 90mm x 90mm, the appropriate size of the pack is 901L7ILφ x 5mm.

If this puncture is used in the head of the riser, the aluminum foil will also have a sufficient heat generating effect along with the heat generating agent, so only a small amount of powdery heat generating agent will be used, and the cost can be cut in half.

Knob 4 serves to fix the puncture when it is placed on the model head of the riser during mold making.

Figures 2 and 3 show this state, and the feeder heat-generating heat-insulating puncture 1 of the present invention is placed on the head of the feeder model 5 and fixed in the sand 6, so that it can be removed from the hot water lower. When metal is poured into the mold 8, during solidification, the head of the riser 5 with the pack 1 is in a heat-generating state, and a sufficient effect of replenishing the riser is exerted.

The puncture according to the present invention can be incorporated into the riser mounting method described in Japanese Patent Publication No. 51-44090 to achieve further economical effects.

FIG. 4 shows an example of this case, in which a core 9 with a plurality of holes is inserted into the neck portion of the feeder 5, and the present invention, which is smaller than the diameter of the feeder, is inserted into the feeder space. Set the heat generating pack 1 (in this case, there is no need to fix the puncture 1).

This way, when the molten metal rises into the riser space during pouring,
Since the exothermic pack is pushed up to the head of the riser without being burned, the exothermic agent is fully utilized and the heat retention effect of the riser can be exerted.

[Brief explanation of drawings]

A in FIG. 1 is a cross-sectional view of a heat-generating heat-insulating pack for a riser according to the present invention, and the mouth thereof is a plan view thereof, and FIGS. 2 to 4 are cross-sectional views of a molding device showing an embodiment of the present invention. 1... Heat generating heat insulation pack for the riser, 2... Exothermic agent layer, 3...
... Aluminum foil, 4... 1 piece, 5... riser,
6... Sand, 7... Sprue, 8... Mold, 9... Core.

Claims (1)

[Scope of utility model registration request] This heat-generating heat-insulating pack for a riser is made by covering a granular heating agent layer 2 with an aluminum foil 3 to form a substantially disk shape, and providing a hole 4 at the top of the layer.