CN212525924U

CN212525924U - Hollow pouring rod for lost foam casting

Info

Publication number: CN212525924U
Application number: CN202021034113.0U
Authority: CN
Inventors: 王仁飞; 魏建涛; 付会群
Original assignee: Luoyang Gangfeng Engineering Machinery Manufacturing Co ltd
Current assignee: Luoyang Gangfeng Engineering Machinery Manufacturing Co ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2021-02-12
Anticipated expiration: 2030-06-08

Abstract

A hollow pouring rod for lost foam casting relates to the technical field of excavator bucket tooth casting, and comprises a pouring cup, a pouring channel pipe and a polygonal shell; the pouring cup, the pouring channel pipe and the polygonal shell are sequentially arranged from top to bottom, the pouring cup is in a reverse taper shape, two ends of the pouring cup are open, the bottom of the pouring cup is communicated with one end of the pouring channel pipe, and the other end of the pouring channel pipe is correspondingly communicated with the top of the polygonal shell; a conical plug matched with the inner cavity of the pouring cup in a corresponding manner is movably inserted in the open mouth at the top of the pouring cup; the utility model discloses it is big effectively to have solved current solid white mould and has watered the gas production of system, the problem of the phenomenon of the casting workpiece surface recarburization appears easily.

Description

Hollow pouring rod for lost foam casting

Technical Field

The utility model belongs to the technical field of excavator bucket tooth casting technique and specifically relates to a lost foam casting is with hollow stick of watering is related to.

Background

The known lost foam casting is a novel casting method which comprises the steps of bonding and combining foam models with similar sizes and shapes to form a white mold, coating refractory paint on the white mold, drying the white mold, burying the white mold in dry sand, vibrating and molding the white mold, igniting the white mold under negative pressure of the dry sand, burning foam in the mold, pumping flue gas away along with a vacuum system, pouring under negative pressure after a mold sample is burnt into a hollow shell, enabling liquid metal to occupy the position of the mold, and solidifying and cooling the mold sample to form a casting; the model is made of EPS (polystyrene, molecular formula C8H8, carbon content 92% (mass fraction)) beads and STMMA (styrene-acrylonitrile copolymer resin, carbon content 69.6% (mass fraction)) beads, and is wrapped in a coating layer after being molded, and after being ignited, the model and oxygen chemically react; the traditional lost foam casting adopts a solid pouring bar, a riser and a solid pattern, and the pouring bar needs to be made into a long column shape because the liquid metal needs to keep a certain static pressure, the solid long column bar only has a combustion surface contacting with oxygen and is difficult to fully combust, the effect is poor even if pure oxygen is blown in, more residues are left after combustion, and the surface of a cast piece is seriously carburized after casting; such a phenomenon is a problem to be solved by those skilled in the art.

Disclosure of Invention

In order to overcome the deficiency in the background art, the utility model discloses a hollow casting rod for lost foam casting.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a hollow pouring rod for lost foam casting comprises a pouring cup, a pouring channel pipe and a polygonal shell; the pouring cup, the pouring channel pipe and the polygonal shell are sequentially arranged from top to bottom, the pouring cup is in a reverse taper shape, two ends of the pouring cup are open, the bottom of the pouring cup is communicated with one end of the pouring channel pipe, and the other end of the pouring channel pipe is correspondingly communicated with the top of the polygonal shell; and a conical plug which is correspondingly matched with the inner cavity of the pouring cup is movably inserted in the open mouth at the top of the pouring cup.

Preferably, the conical surface of the conical plug is provided with a step surface which can be correspondingly contacted with the edge of the top of the pouring cup.

Preferably, the top of the conical plug is provided with a handle.

Preferably, the pipe wall of the runner pipe is in corresponding transitional connection with the top shell wall of the prismatic shell through an arc angle.

Preferably, each side of the polygonal column shell is provided with a connector.

Preferably, the connecting head is provided with a ring groove at one end correspondingly connected with the polygonal column shell.

Preferably, the pouring cup, the pouring channel pipe and the polygonal shell are designed in an integrated manner.

Preferably, the sprue cup, the sprue pipe and the polygonal shell are designed in a split mode, and two ends of the sprue pipe are respectively and correspondingly and tightly connected with the sprue cup and the polygonal shell in an inserted mode.

Preferably, the polygonal prism housing is a hexagonal prism or an octagonal prism.

Due to the adoption of the technical scheme, the utility model discloses following beneficial effect has:

the utility model discloses a lost foam casting is with hollow stick of watering, simple structure, manufacturing cost is lower, pouring basin, runner pipe and polygon prism casing are hollow structure, be hollow white mould, and hollow white mould can effectively reduce material consumption, the gas production is little, and contact oxygen area is big when hollow white mould burns, burns more completely, can effectively reduce the phenomenon of casting work piece surface carburetion, and hollow white mould is dry easily, can reduce the drying time of one third compared with solid white mould, is difficult to appear false dry phenomenon; the sprue cup, the sprue pipe and the polygonal shell can be subjected to oxygen-enriched combustion firstly during casting, a corresponding polygonal cavity is formed in the sand mold after the polygonal shell is subjected to oxygen-enriched combustion, the cavity can replace a traditional casting riser, and meanwhile, a certain negative pressure can be formed in the sand mold after the sprue cup, the sprue pipe, the polygonal shell and a cast mold body are subjected to oxygen-enriched combustion, so that a certain feeding effect can be enhanced.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic perspective view of the present invention.

In the figure: 1. a pouring cup; 2. a runner pipe; 3. a polygonal housing; 4. a tapered plug; 5. a step surface; 6. a handle; 7. a connector; 8. a ring groove; 9. a cross gate.

Detailed Description

The invention will be explained in more detail by the following examples, which disclose the invention and are intended to protect all technical improvements within the scope of the invention.

With the attached drawings 1-2, the hollow pouring rod for lost foam casting comprises a pouring cup 1, a pouring channel pipe 2 and a polygonal shell 3; the pouring cup 1, the pouring channel pipe 2 and the polygonal shell 3 are sequentially arranged from top to bottom, the pouring cup 1 is in an inverted cone shape, two ends of the pouring cup are open, the bottom of the pouring cup 1 is communicated with one end of the pouring channel pipe 2, and the other end of the pouring channel pipe 2 is correspondingly communicated with the top of the polygonal shell 3; before casting, corresponding casting mold bodies can be bonded on the side walls of the polygonal column shell 3 through a cross gate 9, the sprue cup 1, the sprue pipe 2 and the polygonal column shell 3 can be subjected to oxygen-enriched combustion firstly, corresponding polygonal column cavities are formed in a sand mold after the polygonal column shell 3 is subjected to oxygen-enriched combustion, the cavities can replace a traditional casting riser, and meanwhile, certain negative pressure can be formed in the sand mold after the sprue cup 1, the sprue pipe 2, the polygonal column shell 3 and the cast mold bodies are subjected to oxygen-enriched combustion, so that a certain feeding effect can be enhanced;

the sprue cup 1, the sprue pipe 2 and the polygonal shell 3 are all of hollow structures, namely, hollow white molds, the hollow white molds can effectively reduce material consumption, and the material consumption volume of the solid white molds is 1566652mm by taking a common pouring system of a certain type as an example³The volume of the hollow white mould material is 816181mm³The volume of the used materials is reduced by 47.9 percent; the gas forming amount of the hollow white mold is small, taking a common pouring system of a certain type as an example, if the material is eps, the density after foaming is calculated according to 24g/l, the material of the hollow white mold is 37.6g, the gas forming amount is 84.2l (CO2), the gas forming amount of the hollow white mold is 43.9l (CO2), and the gas forming amount after combustion is reduced by about 50%; the hollow white mold has large oxygen contact area during combustion, is more complete in combustion, can effectively reduce the phenomenon of recarburization on the surface of a cast workpiece, is easy to dry, can shorten one third of drying time compared with a solid white mold, and is not easy to have a false dry phenomenon;

a conical plug 4 which is correspondingly matched with the inner cavity of the pouring cup 1 in an engaged manner is movably inserted in the open top of the pouring cup 1, namely, the conical plug 4 can be used for sealing the open top of the pouring cup 1 in the process of manufacturing a sand mold, so that foreign matters are prevented from accidentally entering the pouring cup 1, and the cavity volume of the polygonal shell 3 is reduced; according to the requirement, the conical surface of the conical plug 4 is provided with a step surface 5 which can be correspondingly contacted with the edge of the top of the pouring cup 1, namely, the step surface 5 can be inserted into the conical plug 4 at the present depth, so that the pouring cup 1 is prevented from being broken due to the fact that the conical plug 4 enters the pouring cup 1 too deeply due to misoperation of an operator; the top of the conical plug 4 is provided with a handle 6, namely the conical plug 4 can be taken away through the handle 6 before casting, so that casting operation is facilitated;

in addition, the pipe wall of the runner pipe 2 is in corresponding transitional connection with the top shell wall of the prismatic shell 3 through an arc angle, so that the molding of a sand mold can be facilitated, and the defect of looseness at a dead angle position is avoided; each side surface of the polygonal shell 3 is provided with a connector 7, so that a cross runner 9 of a casting die body and the connectors 7 can be correspondingly and tightly inserted and firmly bonded, and the operation is simple and rapid; a ring groove 8 is formed in one end, corresponding to the polygonal shell 3, of the connector 7, namely a certain adhesive can be stored in the ring groove 8, so that a cross runner 9 of a casting die body can be firmly bonded with the side wall of the polygonal shell 3; the sprue cup 1, the sprue pipe 2 and the polygonal shell 3 can be designed in an integrated manner, the manufacturing process flow is simple, or the sprue cup 1, the sprue pipe 2 and the polygonal shell 3 are designed in a split manner, two ends of the sprue pipe 2 are respectively and tightly inserted and communicated with the sprue cup 1 and the polygonal shell 3 in a corresponding manner, namely, the length of the sprue pipe 2 can be adjusted as required to adapt to different casting mold bodies; the polygonal column shell 3 is a hexagonal column or an octagonal column, namely six or eight workpieces can be cast at the same time, and the operation efficiency is high.

Implement lost foam casting with hollow stick of watering, bond corresponding casting die body through cross gate 9 at 3 lateral walls of polygon prism casing during the use to uncovered sealed in the top with pouring basin 1 through conical plug 4, prevent when the preparation sand mould in the unexpected entering pouring basin 1 of foreign matter, lead to the cavity volume of polygon prism casing 3 to reduce, take off conical plug 4 during the casting and can carry out the casting operation.

The part of the utility model not detailed is prior art.

Claims

1. A hollow pouring rod for lost foam casting is characterized in that: comprises a pouring cup (1), a pouring channel pipe (2) and a polygonal shell (3); the pouring cup (1), the pouring channel pipe (2) and the polygonal shell (3) are sequentially arranged from top to bottom, the pouring cup (1) is in a reverse cone shape, two ends of the pouring cup are open, the bottom of the pouring cup (1) is communicated with one end of the pouring channel pipe (2), and the other end of the pouring channel pipe (2) is correspondingly communicated with the top of the polygonal shell (3); the top of the pouring cup (1) is movably inserted with a conical plug (4) which is correspondingly matched with the inner cavity of the pouring cup (1).

2. The hollow casting rod for lost foam casting as set forth in claim 1, wherein: the conical surface of the conical plug (4) is provided with a step surface (5) which can be correspondingly contacted with the edge of the top of the pouring cup (1).

3. The hollow casting rod for lost foam casting as set forth in claim 1, wherein: and a handle (6) is arranged at the top of the conical plug (4).

4. The hollow casting rod for lost foam casting as set forth in claim 1, wherein: the pipe wall of the sprue pipe (2) is in corresponding transition connection with the top shell wall of the polygonal column shell (3) through an arc angle.

5. The hollow casting rod for lost foam casting as set forth in claim 1, wherein: and each side surface of the polygonal column shell (3) is provided with a connector (7).

6. The hollow casting rod for lost foam casting as set forth in claim 5, wherein: and an annular groove (8) is formed in one end, correspondingly connected with the polygonal prism shell (3), of the connector (7).

7. The hollow casting rod for lost foam casting as set forth in claim 1, wherein: the pouring cup (1), the pouring channel pipe (2) and the polygonal shell (3) are designed in an integrated mode.

8. The hollow casting rod for lost foam casting as set forth in claim 1, wherein: the pouring cup (1), the pouring channel pipe (2) and the polygonal shell (3) are designed in a split mode, and two ends of the pouring channel pipe (2) are respectively in corresponding and tight splicing communication with the pouring cup (1) and the polygonal shell (3).

9. The hollow casting rod for lost foam casting as set forth in claim 1, wherein: the polygonal column shell (3) is a hexagonal column or an octagonal column.