CN215614852U - Lost foam casting mold for 90-degree elbow - Google Patents

Abstract

The utility model discloses a lost foam casting mold for a 90-degree elbow, and aims to effectively solve the problems of box lifting, node and the like easily occurring in the conventional lost foam casting process of the 90-degree elbow. Therefore, the lost foam casting mold for the 90-degree elbow provided by the embodiment of the utility model comprises a sand box, an elbow lost foam model arranged in the sand box and a pouring system connected with the elbow lost foam model, wherein the elbow lost foam model is provided with a first end and a second end, an opening of the first end is arranged in a downward inclined mode and forms an included angle of 45 degrees with the horizontal plane, and an opening of the second end is arranged in an upward inclined mode and forms an included angle of 45 degrees with the horizontal plane.

Description

Lost foam casting mold for 90-degree elbow

Technical Field

The utility model belongs to the technical field of lost foam casting, and particularly relates to a lost foam casting mold for a 90-degree elbow.

Background

The lost foam casting process of the 90-degree elbow always troubles production technicians, and because the special structure of the lost foam casting process easily causes casting defects of mold lifting, deformation, casting cold shut and the like, the successful lost foam casting process of the 90-degree elbow depends on the placing angle of the mold in a sand box, whether a pouring system can ensure quick forming speed and calculate the projection area of the mold and the buoyancy of molding sand and molten iron.

Fig. 1 and 2 show a molding manner of a conventional 90-degree elbow, which is designed in a manner that two ends of the conventional 90-degree elbow are at the same height and bottom casting is adopted, and because the horizontal projection area of a model is large, a casting is easy to lift a box, so that batch waste is caused. In addition, the ingate of the model can not bear the weight of the model, particularly, after the inner cavity of the model enters molding sand, the ingate part of the model is broken, the flow rate of molten iron poured into the cavity can be reduced under the condition, and a casting is scrapped due to the reduction of the pouring speed. Secondly, the ingate of the model can not bear the weight of the model and the weight of the molding sand entering the inner cavity of the model, and the ingate pushes the model to form a pit, so that the surface quality of the casting has serious defects and is scrapped.

Fig. 3 and 4 show another molding method of a conventional 90-degree elbow, which has dead corners due to the horizontal arrangement of the lower part of the elbow, so that molding sand is not easy to fill in place, and node is easy to generate at the dead corners due to the insufficient tap time, thereby causing casting scrap; in addition, because the upper part of the elbow forms an angle of 60 degrees, the model is easy to deform and scrap in the molding and sand adding process; secondly, as only one layer of pouring channels are arranged, the stroke of molten iron is long, and cold shut is easily generated at the top, if two layers of pouring channels are adhered, the process outlet rate is reduced, and the risk of box collapse is increased.

In view of the above, there is a need for improvements in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a lost foam casting mold for a 90-degree elbow, and aims to effectively solve the problems of box lifting, node and the like easily occurring in the conventional lost foam casting process of the 90-degree elbow.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a disappearance mould casting mould for 90 degrees elbows, includes the sand box, set up in elbow disappearance mould model in the sand box and with the gating system that elbow disappearance mould model is connected, elbow disappearance mould model has first end and second end, first end opening slope setting down to personally submit 45 degrees contained angles with the level, second end opening slope setting up to personally submit 45 degrees contained angles with the level.

Specifically, the pouring system comprises a sprue and a cross gate, one end of the cross gate is connected with the upper side part of the first end of the elbow evaporative pattern casting model, and the other end of the cross gate is connected with the sprue.

Specifically, the gating system further comprises a pouring cup arranged at the top of the sprue.

Specifically, the sand box adopts a negative pressure sand box.

Specifically, the bend lost foam model adopts an EPS model.

Specifically, the nominal diameter of the 90-degree elbow is greater than or equal to 250 mm.

Compared with the prior art, at least one embodiment of the utility model has the following beneficial effects:

(1) the elbow lost foam model is placed in a sand box in a 90-degree mode, so that the projection area is small, the risk of lifting the box is avoided, no molding sand filling dead angle is formed in the lower part, and the defect of node knots of a casting is avoided.

(2) The pouring gate is arranged at the middle lower part of the model, so that the stroke of molten iron is shortened, and the casting is not easy to have cold shut defects.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic front view of a conventional 90 degree elbow in a molding manner;

FIG. 2 is a schematic side view of a conventional 90 elbow in one form;

FIG. 3 is a schematic front view of another conventional 90-degree elbow;

FIG. 4 is a schematic side view of another prior art 90 elbow configuration;

FIG. 5 is a schematic front view of a lost foam casting mold provided in an embodiment of the present invention;

FIG. 6 is a schematic side view of a lost foam casting mold provided in accordance with an embodiment of the present invention;

wherein 1, a sand box; 2. an elbow lost foam model; 201. a first end; 202. a second end; 3. a pouring system; 301. a sprue; 302. a cross gate; 303. a pouring cup.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 5 and 6, the lost foam casting mold for 90-degree elbows comprises a sand box 1, an elbow lost foam model 2 arranged in the sand box 1 and a pouring system 3 connected with the elbow lost foam model 2, wherein the elbow lost foam model 2 is provided with a first end 201 and a second end 202, the first end 201 is obliquely arranged with an opening facing downwards and forms a 45-degree included angle with the horizontal plane, and the second end 202 is obliquely arranged with an opening facing upwards and forms a 45-degree included angle with the horizontal plane.

In this embodiment, during pouring, the molten metal enters the die cavity where the full-mold modeling of the elbow evaporative pattern casting model 2 is located from the pouring system 3, and the molten metal occupies the full-mold modeling position of the elbow evaporative pattern casting model 2, so as to obtain a required elbow casting, and the elbow evaporative pattern casting model 2 is placed in the sand box 1 in a 90-degree manner, so that not only is the projection area small and has no risk of lifting the box, but also no molding sand filling dead angle is formed in the lower part of the elbow evaporative pattern casting, and the casting is not prone to nodule defects.

Referring to fig. 6, in some embodiments, the gating system 3 comprises a sprue 301 and a runner 302, one end of the runner 302 is connected with the upper side of the first end 201 of the evaporative pattern casting model 2, the other end of the runner is connected with the sprue 301, the runner is arranged at the lower position in the model, the stroke of molten iron is shortened, and the casting is not prone to cold shut defects.

Referring to fig. 6, it can be understood that in practical design, the gating system 3 further includes a pouring cup 303 disposed at the top of the sprue 301, the pouring cup 303 extends out of the sand surface of the sand box 1, and by disposing the pouring cup 303, not only can splashing and overflow of molten metal be prevented, direct impact of the molten metal on the mold be reduced, but also the sprue 301 can be prevented from being filled with slag and impurities.

In other embodiments, in order to increase the strength and rigidity of the molding sand and facilitate the removal of the model gasification products, the sand box 1 adopts a negative pressure sand box, and the magnitude and the retention time of the negative pressure are adaptively selected according to the specific casting material, the model cluster structure and the type of the coating.

It should be explained that in the actual design, the lost foam model of the elbow can be made of EPS (expandable polystyrene resin beads) foam, and certainly can also be made of other foam materials, and the lost foam casting mold of the embodiment is particularly suitable for the production of 90-degree elbows with the nominal diameter of more than or equal to 250 mm.

Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.

Meanwhile, if the utility model as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated. Any part provided by the utility model can be assembled by a plurality of independent components or can be manufactured by an integral forming process.

The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the utility model may be made without departing from the scope of the utility model.

Claims (6)

1. A lost foam casting mould for 90-degree elbows comprises a sand box (1), an elbow lost foam model (2) arranged in the sand box (1) and a pouring system (3) connected with the elbow lost foam model (2), and is characterized in that: elbow disappearance mould model (2) have first end (201) and second end (202), first end (201) opening slope down sets up to personally submit 45 degrees contained angles with the level, second end (202) opening slope up sets up to personally submit 45 degrees contained angles with the level.

2. A lost foam casting mold as defined in claim 1, wherein: the pouring system (3) comprises a straight pouring channel (301) and a horizontal pouring channel (302), one end of the horizontal pouring channel (302) is connected with the upper side portion of the first end (201) of the elbow lost foam model (2), and the other end of the horizontal pouring channel (302) is connected with the straight pouring channel (301).

3. A lost foam casting mold as defined in claim 2, wherein: the pouring system (3) further comprises a pouring cup (303) arranged at the top of the sprue (301).

4. A lost foam casting mold according to any one of claims 1 to 3, wherein: the sand box (1) adopts a negative pressure sand box.

5. A lost foam casting mold for 90 degree elbows according to any one of claims 1-3, wherein: the elbow lost foam model (2) adopts an EPS model.

6. A lost foam casting mold according to any one of claims 1 to 3, wherein: the nominal diameter of the 90-degree elbow is more than or equal to 250 mm.

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