CN112342400A

CN112342400A - Precise bubble-eliminating casting process for hardware casting

Info

Publication number: CN112342400A
Application number: CN202011093815.0A
Authority: CN
Inventors: 潘玉霞
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-02-09

Abstract

The invention discloses a precise defoaming casting process of a hardware casting, which belongs to the technical field of five casting, and effectively realizes multiple deoxidation by adopting oxygenation and deoxidation technical means and matching with a carbon adsorption body arranged in a defoaming tank, firstly, a large amount of oxygen is introduced into a melt to realize the discharge of a large amount of hydrogen in the melt, then a deoxidation metal bag body is utilized to react with the oxygen in the melt to generate precipitates insoluble in the melt to be separated out, most of the oxygen is removed, and a small amount of gas which is not discharged or completely reacted and remains in the melt is discharged, the residual gas in the melt is discharged in a diffusion adsorption type by utilizing the matching of the carbon adsorption body and an air storage tank, so that the gas elimination rate in the melt is effectively improved, and finally, when the melt is cast, the gas which is not completely eliminated is finally removed by utilizing an exhaust mechanism communicated with a sand core, the defoaming casting of the hardware casting is effectively realized to a certain extent.

Description

Precise bubble-eliminating casting process for hardware casting

Technical Field

The invention relates to the technical field of five-piece casting, in particular to a precise bubble-eliminating casting process for a hardware casting.

Background

Casting is a relatively early metal hot working process mastered by human beings, and is a method of casting liquid metal into a casting cavity adaptive to the shape of a part, and obtaining the part or a blank after the liquid metal is cooled and solidified. The casting material is mostly metal (such as copper, iron, aluminum, tin, lead, etc.) which is originally solid but is heated to liquid state, and the material of the casting mold can be sand, metal or even ceramic. The method used may be different according to different requirements.

In the smelting process, the alloy liquid directly contacts with furnace gas, which is the main way of metal gettering. The corrosion or oil stain of the furnace charge and the use of fuels with moisture or over-high sulfur content can cause the increase of the content of gases such as steam, hydrogen, sulfur dioxide and the like in furnace gas and increase the air suction of the alloy liquid. The interaction between the alloy liquid and the casting mold is another way for the alloy to absorb gas. In addition, improper design of a pouring system, poor air permeability of a casting mold, insufficient exhaust measures and the like all cause air entrainment by injection, splashing and vortex of the alloy liquid when the alloy liquid is poured into the cavity, increase gas in the metal and reduce the precision of the casting.

Therefore, a precise bubble-eliminating casting process for hardware castings is provided to effectively solve the problems in the prior art.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a precise defoaming casting process of a hardware casting, which effectively realizes multiple deoxidation by adopting oxygenation and deoxidation technical means and matching with a carbon adsorption body arranged in a defoaming tank, firstly introduces a large amount of oxygen into a melt to discharge a large amount of hydrogen in the melt, then utilizes a deoxidation metal bag body to react with the oxygen in the melt to generate precipitate which is insoluble in the melt to be separated out to remove most of the oxygen, and retains a small amount of gas which is not discharged or completely reacted in the melt, utilizes the matching of the carbon adsorption body and an air storage tank to discharge residual gas in the melt in a diffusion adsorption mode, effectively improves the gas elimination rate in the melt, and finally utilizes an exhaust mechanism communicated with a sand core to finally discharge the gas which is not completely eliminated when the melt is cast, the defoaming casting of the hardware casting is effectively realized to a certain extent.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A precise bubble-eliminating casting process for a hardware casting comprises the following specific casting process steps:

s1, smelting the melt, introducing the melt into a defoaming tank from bottom to top, continuously increasing oxygen into the defoaming tank, and removing a large amount of hydrogen;

s2, deoxidizing the melt after removing a large amount of hydrogen in the S1, arranging carbon adsorption bodies on the inner walls of the periphery of the defoaming tank, and putting a plurality of deoxidizing metal bag bodies into the defoaming tank to realize double deoxidation of diffusion type deoxidation and precipitation type deoxidation;

s3, preheating a mold, wherein a sand core is arranged in the mold, an exhaust mechanism communicated with the interior of the sand core is arranged on the outer side of the mold, the upper mold moves downwards to be matched with the lower mold, the melt processed in the S2 is poured into the sand core, and the exhaust mechanism is used for exhausting gas which is not exhausted from the melt;

s4, keeping the temperature for 1-1.5h, cooling, opening the die and taking out the casting.

Further, the bottom lateral wall of defoaming jar runs through and is equipped with the fuse-element induction pipe, the outside cover of defoaming jar is equipped with the gas storage tank rather than the sealed linking of inner wall, offer the through hole that is used for the fuse-element induction pipe to run through the setting on the lateral wall of gas storage tank, the top of defoaming jar is inlayed and is established sealed head that has, top one side of head is equipped with the fuse-element contact tube that extends to the defoaming jar inside, pours into the fuse-element into the defoaming jar into through the fuse-element induction pipe, and supreme leading-in to the defoaming jar is followed to the fuse-element, and fuse-element induction pipe and fuse-element contact tube department all install the valve, and.

Further, the upper end middle part of head is equipped with the oxygenation pipe, the bottom of oxygenation pipe runs through the head and extends to inside the gas storage tank, the annular has been seted up a plurality ofly on the lateral wall of oxygenation pipe and has been inlayed and establish the chamber, and is a plurality of deoxidation metal utricule distributes and establishes intracavity portion in a plurality of inlaying, and the oxygenation pipe is used for the interior oxygen suppliment of defoaming jar, and gaseous phase and liquid phase are crowded press and are contacted, utilize the mutual restriction relation that exists between hydrogen, oxygen concentration, are favorable to discharging the hydrogen in the fuse-element.

Further, deoxidization metal utricule is including being located inside deoxidier, the outside cladding of deoxidier has hot melt capsule, the inner of hot melt capsule is connected with the inner wall of inlaying the chamber of establishing through the adhesive linkage, and a plurality of deoxidization metal utricules distribute on the lateral wall of oxygenation pipe from top to bottom, and after the bottom of defoaming jar upwards extended from the fuse-element, the deoxidization metal utricule that is located the oxygenation pipe lower extreme melts earlier, and after hot melt capsule received the heat fusion, its inside deoxidier exposes in the fuse-element, and oxygen in the fuse-element generates the deposit that is insoluble in the fuse-element and separates out, consumes the oxygen in the fuse-element.

Further, the deoxidizer is one or more of magnesium, manganese and aluminum, and the hot-melt capsule is made of meltable glue.

Further, the carbon adsorption body includes that the annular distributes a plurality of arcs on defoaming jar inner wall and sucks the piece, and is a plurality of the arc sucks the piece and forms the absorption chamber with the defoaming jar inner wall, it has the charcoal adsorbed layer to adsorb intracavity portion packing, the arc sucks the cladding on the outer wall of piece has high temperature resistant ventilated membrane, and the arc sucks piece and the cooperation of charcoal adsorbed layer, is convenient for carry out wide area to the gas in the fuse-element and adsorbs.

Furthermore, the arc-shaped air suction piece is formed by blending and sintering high-temperature-resistant resin and modified calcium carbonate, and the inner end face and the outer end face of the arc-shaped air suction piece are coated with silicon dioxide.

Further, the gas storage chamber has been seted up to the inside of gas storage tank, set up the aspirating hole that corresponds with the arc piece position of breathing in on the inner wall of gas storage tank, set up the air guide layer corresponding with the aspirating hole position on the lateral wall of defoaming jar, the top portion of gas storage tank is equipped with the blast pipe that runs through to the inside of gas storage chamber, and leading-in to the gas of gas storage chamber inside through the carbon adsorption body is derived through the blast pipe at last, and technical personnel in the art can be connected the blast pipe with external negative pressure equipment for extract the gas in the defoaming jar.

Furthermore, the mould comprises an upper mould and a lower mould, and sand cavities for forming the sand core are formed in opposite side walls of the upper mould and the lower mould.

Further, exhaust mechanism installs in the bed die left and right sides including inlaying, the outer end extend to the outside of bed die, offer the arc wall that is used for seal installation on the bed die, the bottom both sides of going up the mould are all inlayed and are established and install with the sealed laminating of up end mutually, two from top to bottom all offer on the inner wall in sand chamber with the gas pocket that is linked together, with the cooperation, be favorable to leakproofness and the steadiness behind mould, the bed die compound die on the one hand, on the other hand, through the cooperation intercommunication of gas pocket with, be favorable to pouring the residual gas of sand in-core when the fuse-element is poured.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) this scheme is through adopting oxygenation, deoxidation technological means and with set up the cooperation in the inside carbon adsorption body of defoaming jar, effectively realize multiple deoxidation, at first to leading-in a large amount of oxygen in the fuse-element, realize discharging a large amount of hydrogen in the fuse-element, the oxygen reaction of reuse deoxidation metal utricule and fuse-element generates the precipitate that is insoluble in the fuse-element and separates out, get rid of most oxygen, and remain in the fuse-element not discharge or the complete small part gas of unreacted, then utilize the cooperation of carbon adsorption body and accumulator, discharge the residual gas in the fuse-element through the diffusion adsorption formula, effectively improved the gas elimination rate in the fuse-element, at last when carrying out the fuse-element casting, utilize the exhaust mechanism who is linked together with the psammitolite to carry out final getting rid of to the clean gas of not eliminating, effectively realize the defoaming casting of five metals foundry goods to a certain extent.

(2) The bottom lateral wall of defoaming jar runs through and is equipped with the fuse-element induction pipe, the outside cover of defoaming jar is equipped with the gas storage tank rather than the sealed linking of inner wall, offer the through hole that is used for the fuse-element induction pipe to run through the setting on the lateral wall of gas storage tank, the top of defoaming jar is inlayed and is established sealedly and has the head, top one side of head is equipped with the fuse-element contact tube that extends to the defoaming jar inside, pour into the fuse-element into in to the defoaming jar through the fuse-element induction pipe, supreme leading-in to the defoaming jar is down followed to the fuse-element, fuse-element induction pipe and fuse-element contact.

(3) The upper end middle part of head is equipped with the oxygenation pipe, and inside the head was run through and extended to holding the gas jar to the bottom of oxygenation pipe, and the annular was seted up a plurality ofly on the lateral wall of oxygenation pipe and is inlayed and establish the chamber, and a plurality of deoxidation metal utricules distribute in a plurality of inlays and establish intracavity portion, and the oxygenation pipe is used for the interior oxygen suppliment of defoaming jar, and gaseous phase and liquid phase are crowded pressing mutually and are contacted, utilize the mutual restriction relation that exists between hydrogen, oxygen concentration, are favorable to discharging the hydrogen in the fuse-element.

(4) The deoxidizing metal capsule body comprises a deoxidizing agent inside, the outer side of the deoxidizing agent is coated with a hot-melt capsule, the inner end of the hot-melt capsule is connected with the inner wall of the embedded cavity through an adhesive layer, a plurality of deoxidizing metal capsule bodies are distributed on the outer side wall of the oxygen increasing pipe up and down, the deoxidizing agent adopts one or more of magnesium, manganese and aluminum, the hot-melt capsule is made of meltable glue, when the melt expands upwards from the bottom of the defoaming tank, the deoxidizing metal capsule body at the lower end of the oxygen increasing pipe melts firstly, after the hot melt capsule is melted, the deoxidizer inside the deoxidizer is exposed in the melt, generates precipitate which is insoluble in the melt and is separated out with the oxygen in the melt, consumes the oxygen in the melt, and the deoxidation metal capsule bodies are sequentially distributed on the outer wall of the oxygenation pipe from top to bottom, and the melt led into the defoaming tank is sequentially expanded upwards, so that the full diffusion type contact of the plurality of deoxidation metal capsule bodies and the melt is facilitated.

(5) Carbon adsorption body includes that the annular distributes a plurality of arcs on defoaming jar inner wall and inhales the piece, a plurality of arcs inhale the piece and form the absorption chamber with defoaming jar inner wall, it has the charcoal adsorbed layer to adsorb intracavity portion packing, the cladding has high temperature resistant ventilated membrane on the outer wall of arc piece of breathing in, the arc piece of breathing in is formed by high temperature resistant resin and modified calcium carbonate blending sintering, the arc piece of breathing in all coats on the interior terminal surface has silicon dioxide, the arc piece of breathing in cooperates with the charcoal adsorbed layer, be convenient for carry out wide area to the gas in the fuse-element and adsorb.

(6) The gas storage cavity has been seted up to the inside of gas storage tank, set up the aspirating hole that corresponds with the arc piece position of breathing in on the inner wall of gas storage tank, set up the air guide layer corresponding with the aspirating hole position on the lateral wall of defoaming jar, the top portion of gas storage tank is equipped with the blast pipe that runs through to the inside of gas storage cavity, derive through the blast pipe through the leading-in gas to the inside of gas storage cavity of carbon adsorption body at last, technical personnel in the art can be connected the blast pipe with external negative pressure equipment for extract the gas in the defoaming jar.

(7) The mould includes mould and bed die, the sand chamber that constitutes the psammitolite is all seted up to the relative lateral wall of going up mould and bed die, exhaust mechanism installs in the bed die left and right sides including inlaying to establish, the outer end extend to the outside of bed die, offer the arc wall that is used for seal installation on the bed die, the bottom both sides of going up the mould are all inlayed and are established and install and seal up the laminating mutually with the up end, all set up the gas pocket with being linked together on the inner wall of two upper and lower sand chambers, and cooperation, be favorable to going up the mould on the one hand, leakproofness and steadiness behind the bed die compound die, on the other hand, cooperation intercommunication through gas pocket and, be favorable to when the fuse-element is pour with the interior residual.

Drawings

FIG. 1 is a flow chart of the present invention;

FIG. 2 is a perspective view of the defoaming tank and the oxygenating pipe of the present invention when they are separated;

FIG. 3 is a perspective view of the defoaming tank of the present invention when combined with a head;

FIG. 4 is a perspective view of the defoaming tank and the gas storage tank of the present invention shown separated;

FIG. 5 is a partial internal schematic view of the defoaming tank and gas storage tank of the present invention;

FIG. 6 is a schematic view of the oxygen increasing tube and the oxygen-reduced metal capsule of the present invention;

fig. 7 is a perspective view of the present invention with the upper and lower molds separated.

The reference numbers in the figures illustrate:

1 defoaming jar, 101 melt leading-in pipe, 2 carbon adsorption body, 201 arc-shaped air suction sheet, 202 charcoal adsorption layer, 203 high temperature resistant ventilated membrane, 3 end enclosure, 301 melt leading-out pipe, 4 oxygenation pipe, 401 embedded cavity, 5 deoxidation metal capsule body, 501 hot melt capsule, 502 deoxidizer, 6 gas storage tank, 601 gas storage cavity, 602 air suction hole, 603 exhaust pipe.

Detailed Description

The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-3 and fig. 7, a precise bubble-eliminating casting process for a hardware casting includes the following steps:

s1, smelting the melt, introducing the melt into the defoaming tank 1 from bottom to top, continuously increasing oxygen into the defoaming tank 1, and removing a large amount of hydrogen;

s2, deoxidizing the melt after removing a large amount of hydrogen in the S1, arranging carbon adsorption bodies 2 on the inner walls of the periphery of the defoaming tank 1, and putting a plurality of deoxidizing metal capsule bodies 5 into the defoaming tank 1 to realize double deoxidation of diffusion type deoxidation and precipitation type deoxidation;

Please refer to fig. 2-3, the bottom side wall of the defoaming tank 1 is provided with a melt inlet pipe 101 through, the outer side of the defoaming tank 1 is provided with an air storage tank 6 connected with the inner wall in a sealing manner, a through hole for the melt inlet pipe 101 to pass through is formed in the side wall of the air storage tank 6, the top end of the defoaming tank 1 is embedded with a sealing head 3 in a sealing manner, one side of the top end of the sealing head 3 is provided with a melt outlet pipe 301 extending to the inside of the defoaming tank 1, the melt is injected into the defoaming tank 1 through the melt inlet pipe 101, the melt is introduced into the defoaming tank 1 from bottom to top, valves are respectively installed at the melt inlet pipe 101 and the melt outlet pipe 301, and the melt outlet pipe 301 is used for extracting the.

Referring to fig. 2 and 4-6, an oxygen increasing pipe 4 is arranged in the middle of the upper end of the end enclosure 3, the bottom end of the oxygen increasing pipe 4 penetrates through the end enclosure 3 and extends into the gas storage tank 6, a plurality of embedded cavities 401 are annularly arranged on the side wall of the oxygen increasing pipe 4, a plurality of deoxidizing metal capsules 5 are distributed in the embedded cavities 401, the oxygen increasing pipe 4 is used for supplying oxygen to the defoaming tank 1, gas phase and liquid phase are extruded and contacted, the hydrogen and oxygen concentration restriction relationship is utilized to facilitate the discharge of hydrogen in the melt, the deoxidizing metal capsules 5 comprise deoxidizing agents 502 positioned in the interior, the outer side of the deoxidizing agents 502 is coated with hot melt capsules 501, the inner end of the hot melt capsules 501 is connected with the inner wall of the embedded cavities 401 through an adhesive layer, the deoxidizing agents 502 are one or more of magnesium, manganese and aluminum, the hot melt capsules 501 are made of meltable adhesive, the deoxidizing metal capsules 5 are distributed on the outer side wall of the oxygen increasing pipe 4 up and down, when the melt expands upwards from the bottom of the defoaming tank 1, the deoxidizing metal capsule body 5 at the lower end of the oxygen increasing pipe 4 melts firstly, the hot melt capsule 501 is heated to melt and then breaks away from the oxygen increasing pipe 4, the deoxidizer 502 inside the hot melt capsule is exposed in the melt and generates precipitate insoluble in the melt with oxygen in the melt and separates out, oxygen in the melt is consumed, the melt introduced into the defoaming tank 1 expands upwards in sequence, and the full diffusion type contact between the deoxidizing metal capsule bodies 5 and the melt is facilitated.

Referring to fig. 2 and 4-5, the carbon adsorbent 2 includes a plurality of arc-shaped air suction sheets 201 annularly distributed on the inner wall of the defoaming tank 1, the arc-shaped air suction sheets 201 and the inner wall of the defoaming tank 1 form an adsorption cavity, a charcoal adsorption layer 202 is filled inside the adsorption cavity, the outer wall of the arc-shaped air suction sheet 201 is coated with a high-temperature-resistant breathable film 203, the arc-shaped air suction sheets 201 are formed by blending and sintering high-temperature-resistant resin and modified calcium carbonate, silica is coated on the inner end surface and the outer end surface of the arc-shaped air suction sheets 201, and the arc-shaped air suction sheets 201 are matched with the charcoal adsorption layer 202 to facilitate wide-area adsorption of gas in a melt and effectively reduce the.

The inside of gas storage tank 6 has been seted up and has been held the gas chamber 601, set up on the inner wall of gas storage tank 6 and inhale the aspirating hole 602 that the piece 201 position corresponds with the arc, set up the air guide layer corresponding with aspirating hole 602 position on the lateral wall of defoaming jar 1, the top portion of gas storage tank 6 is equipped with the blast pipe 603 that runs through to holding the inside of gas chamber 601, lead into the gas that holds the inside of gas chamber 601 through carbon adsorption body 2 and derive through blast pipe 603 at last, technical staff in the art can be connected blast pipe 603 with external negative pressure equipment, be used for extracting the gas in the defoaming jar 1.

The mould includes mould and bed die, the sand chamber that constitutes the psammitolite is all seted up to the relative lateral wall of going up mould and bed die, exhaust mechanism establishes 8 of installing in the bed die left and right sides including inlaying, 8 outer end extends to the outside of bed die, offer the arc wall that is used for 8 seal installation on the bed die, the bottom both sides of going up the mould all inlay to establish install 9 with 8 up end looks seal laminating, all set up the gas pocket that is linked together with 8 on the inner wall in two upper and lower sand chambers, 8 and 9's cooperation, be favorable to going up the mould on the one hand, leakproofness and steadiness behind the bed die compound die, on the other hand, cooperation intercommunication through gas pocket and 8, be favorable to pouring the residual gas discharge in the sand core when the fuse-element.

According to the invention, multiple deoxidation is effectively realized by adopting oxygenation and deoxidation technical means and matching with the carbon adsorption body 2 arranged in the defoaming tank 1, firstly, a large amount of oxygen is introduced into the melt to discharge a large amount of hydrogen in the melt, then, the deoxidation metal bag body 5 is used for reacting with the oxygen in the melt to generate precipitate which is insoluble in the melt to be separated out, most of the oxygen is removed, and a small amount of gas which is not discharged or completely reacted in the melt is remained, then, the residual gas in the melt is discharged in a diffusion adsorption mode by matching of the carbon adsorption body 2 and the gas storage tank 6, so that the gas elimination rate in the melt is effectively improved, and finally, when the melt is cast, the gas which is not completely eliminated is finally eliminated by using the exhaust mechanism communicated with the sand core, so that the defoaming casting of the hardware casting is effectively realized to a certain extent.

The components used in the present invention are all standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experiments.

The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.

Claims

1. The precise bubble-eliminating casting process of the hardware casting is characterized in that: the casting process comprises the following specific steps:

s1, smelting the melt, introducing the melt into a defoaming tank (1) from bottom to top, continuously increasing oxygen into the defoaming tank (1), and removing a large amount of hydrogen;

s2, deoxidizing the melt after removing a large amount of hydrogen in the S1, arranging carbon adsorption bodies (2) on the inner walls of the periphery of the defoaming tank (1), and putting a plurality of deoxidizing metal capsule bodies (5) into the defoaming tank (1) to realize double deoxidation of diffusion type deoxidation and precipitation type deoxidation;

2. The precise bubble-eliminating casting process of the hardware casting according to claim 1, which is characterized in that: the bottom lateral wall of defoaming jar (1) runs through and is equipped with fuse-element induction pipe (101), the outside cover of defoaming jar (1) is equipped with and holds gas pitcher (6) rather than the sealed linking of inner wall, offer the through hole that is used for fuse-element induction pipe (101) to run through the setting on the lateral wall of holding gas pitcher (6), the top of defoaming jar (1) is inlayed and is established sealed head (3) that have, top one side of head (3) is equipped with melt eduction tube (301) that extend to defoaming jar (1) inside.

3. The precise bubble-eliminating casting process of the hardware casting according to claim 2, characterized in that: the upper end middle part of head (3) is equipped with oxygenation pipe (4), the bottom of oxygenation pipe (4) runs through head (3) and extends to inside gas storage tank (6), a plurality of inlays and establishes chamber (401) have been seted up to the annular on the lateral wall of oxygenation pipe (4), and is a plurality of deoxidation metal utricule (5) distribute in a plurality of inlays and establish inside chamber (401).

4. The precise bubble-eliminating casting process of the hardware casting according to claim 3, characterized in that: deoxidation metal utricule (5) are including lieing in inside deoxidier (502), the outside cladding of deoxidier (502) has hot melt capsule (501), the inner of hot melt capsule (501) is connected with the inner wall of inlaying and establishing chamber (401) through the adhesive linkage.

5. The precise bubble-eliminating casting process of the hardware casting according to claim 4, wherein the precise bubble-eliminating casting process comprises the following steps: the deoxidizer (502) adopts one or more of magnesium, manganese and aluminum, and the hot-melt capsule (501) is made of fusible gel.

6. The precise bubble-eliminating casting process of the hardware casting according to claim 1, which is characterized in that: carbon adsorption body (2) including the annular distribution a plurality of arcs on defoaming jar (1) inner wall inhale piece (201), a plurality of arc inhale piece (201) and defoaming jar (1) inner wall formation absorption chamber, absorption intracavity portion packs has charcoal adsorbed layer (202), the arc inhales the cladding on the outer wall of piece (201) has high temperature resistant ventilated membrane (203).

7. The precise bubble-eliminating casting process of the hardware casting according to claim 6, characterized in that: the arc-shaped air suction piece (201) is formed by blending and sintering high-temperature-resistant resin and modified calcium carbonate, and the inner end face and the outer end face of the arc-shaped air suction piece (201) are coated with silicon dioxide.

8. The precise bubble-eliminating casting process of the hardware casting according to claim 7, characterized in that: the inside of gas storage tank (6) has been seted up and has been held gas chamber (601), set up on the inner wall of gas storage tank (6) and inhale aspirating hole (602) that piece (201) position corresponds with the arc, set up on the lateral wall of defoaming jar (1) and lead the gas layer corresponding with aspirating hole (602) position, the top portion of gas storage tank (6) is equipped with and runs through to inside blast pipe (603) of gas storage chamber (601).

9. The precise bubble-eliminating casting process of the hardware casting according to claim 1, which is characterized in that: the mould comprises an upper mould and a lower mould, and sand cavities for forming the sand core are formed in opposite side walls of the upper mould and the lower mould.

10. The precise bubble-eliminating casting process of the hardware casting according to claim 9, which is characterized in that: exhaust mechanism installs (8) in the bed die left and right sides including inlaying, the outer end of (8) extends to the outside of bed die, set up the arc wall that is used for (8) seal installation on the bed die, the bottom both sides of going up the mould all inlay establish install with (8) up end looks seal laminating (9), two from top to bottom all set up the gas pocket that is linked together with (8) on the inner wall in sand chamber.