CN85105915A - The casting core box in loam core - Google Patents

Abstract

The present invention is relevant to produce the core box in casting mold loam core with sand-blast, in this box loose piece is arranged, and leans against on the inwall of box, can take this movable part away after core box injects sand.The problem that existing this type of core box takes place is to leak sand and the groove that causes between core box inwall and loose piece, make the loam core of producing produce defective, the present invention then adopts the seal of one or more elastomeric materials, stops up the seam between core box inner surface and the loose piece faying face.

Description

The casting core box in loam core

The present invention addresses the core box of producing the casting mold loam core with sand-blast, has loose piece supporting the inwall of box in this box, can take this loose piece away after core box injects sand.

Common core box all is formed from aluminium for weight reduction, and its loose piece then mostly is bronze, also useful in addition synthetic resin or wood.No matter use what material, a common fault is all arranged, be exactly not wear-resistant.Therefore core box often will touch sand in use, and sand is all had a high wear to every kind of material.The wear phenomenon that sand caused that is sprayed into by compressed air shows the occasion that leakage is arranged when compressed air especially, this crack will be very fast extended, this harm occurs in the surface of being supported by loose piece especially easily, because original narrow seam is through development, soon just expand as groove, this groove just causes the effusion of gas and sand.

Just can feel to have this kind defective in early days.When compressed air can be overflowed in seam, the loam core of producing will defectiveness, and defective comprises pore and lacks the limit.Owing to not allowing this defective effect foundry goods, the repairing so just can only work hard in this loam core comprises manual repairing, and core box itself is easy to very quick-wearing.

Therefore, the objective of the invention is to prevent on the loose piece supporting surface, to form groove.This purpose is to be reached by one or more or a plurality of sealings that the present invention adopts.This sealing is by the seam between the combination of a kind of elastomeric material obstruction core box inner surface and loose piece.

The available accomplished in many ways of sealing of the present invention for example, is put into core box to the model on the flexible surface that adapts with the core box inner wall shape; Inner surface itself applies one deck elastic layer; At last also can on the faying face of loose piece, elastic layer be proposed.The additional advantage of preceding two kinds of methods is to have anti-wear effect concurrently, and the advantage of last method is simple, and it also is applicable to the core box that has used.

Following claim is in order to the convenient further development of using of explanation the present invention.

The present invention will explain in detail with embodiment, shown in Figure 1 is the partial view that the common core box of loose piece is arranged, shown in Figure 2 is to have adopted the situation of the appropriate section of core box behind the present invention, more than the loam core that produces of two core boxs be identical, this loam core is used in centrifugal blade and produces.

The core box of Fig. 1 comprises matrix 1, lid 2, and a plurality of loose pieces 3 evenly distributed around the core box garden week of garden shape, and each loose piece 3 all has a convex tendon 4.Convex tendon 4 is fixing loose piece 3 usefulness, and two ends of the latter are supporting the inwall of core box.

When molding sand by the spirt core box in die cavity 5 during, must keep two binding faces of loose piece 3 and matrixes 1 fixedly to be close to the inwall of lid 2 is honest lead to another side so that prevent compressed air or molding sand from an edge binding face of loose piece 3.If this air flue has taken place, another side at loose piece will cause the hole so, loam core near loose piece will lack the limit, the abrasive action of molding sand will enlarge grooving with this path, this just sharply weares and teares core box conversely, make the loam core of producing that major defect be arranged, so that must repair by hand.

The core box of seeing among Fig. 2 also comprises the structure of Fig. 1 substantially, and matrix 6 is promptly arranged, lid 7, loose piece 8.On interior fort near the matrix 6 of loose piece 8 and lid 7, the elastomeric layer 9 that has hot glue to get on.

When core box altogether the time, loose piece 8 can be absorbed in the elastic layer 9 a little, and this slight amount of being absorbed in is enough to make the whole supporting surface of loose piece 8 to seal fully.Therefore during die cavity 5 sandblasts, just stoped passing through of compressed air and casting sand, thereby prevented the defective in finished product loam core.

Convex tendon 10 is arranged on the loose piece 8, in the place of the close loose piece 8 of convex tendon guide block 11 is arranged, the length f of guide block 11 is littler than the length g that convex tendon 10 stretches out matrix 6.This is in order firmly upwards to eject loose piece 8 on the lower end 12 of convex tendon 10, and 11 all come out when 10 flush.

Additional seal 13 on matrix 6 plays a part additional seal round the bottom of convex tendon 10 between die cavity 5 and core box outside.

Claims (10)

1, a kind of core box with sand-blast production casting mold loam core is made up of a plurality of loose pieces that are arranged in core box, this loose piece leans against on the inner surface of box, after core box is filled, must remove this loose piece, it is characterized by, one or more seals (9) are arranged, cause, in order to stop up the seam between core box (6 and 7) inner surface and loose piece (8) binding face by elastomeric material.

2, the core box described in claim 1 is characterized by, and seal is made of the one or more model that adapts with the core box inner surface configuration with elastic surface.

3, the core box described in claim 1 is characterized by, and seal is formed by the elasticity coat that is coated in core box (6 and 7) inner surface.

4, the core box described in claim 1 and 3 is characterized by, elastomeric layer (9) be glued joint or hot glue on the inner surface of core box (6 and 7).

5, the core box described in claim 1 and 3 is characterized by, and with cast, spraying or its my painting method apply the last layer elastomeric material on the inner surface of core box (6 and 7).

6, the core box described in claim 1 is characterized by, and seal is located on each faying face of loose piece (8).

7, the core box described in claim 1 and 6 is characterized by, be provided with splicing at each faying face of loose piece (8) or hot glue on elastomeric layer.

8, the core box described in claim 1 and 6 is characterized by, and is provided with sealing strip on each faying face of loose piece (8), and the sealing bar preferably is distributed in the dovetail groove of loose piece.

9, as the one or more described core box in claim 1 and the claim 2 to 8, the maintenance convex tendon of insertable is arranged on loose piece, this convex tendon passes the footing of core box.It is characterized by, plug-in type convex tendon (10) each has guide block (11).This guide block (11) is near loose piece (8), connecting one and moving back and pull out part, and this moves back and pulls out the length (g) that part is stretched out core box (6), and is bigger than the length (f) of guide block (11).

10, the core box described in claim 1 and 9 is characterized by, and an elastic sealing element (13) is arranged, and is located in the wall of core box (6), is wrapping moving back of each plug-in type convex tendon (10) and is pulling out part.

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