CN112620580A - Shell making process for long-hole castings - Google Patents
Shell making process for long-hole castings Download PDFInfo
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- CN112620580A CN112620580A CN202011532245.0A CN202011532245A CN112620580A CN 112620580 A CN112620580 A CN 112620580A CN 202011532245 A CN202011532245 A CN 202011532245A CN 112620580 A CN112620580 A CN 112620580A
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- long
- shell
- manufacturing process
- hole
- shell manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a shell making process for long-hole castings, wherein zircon sand is adopted for a surface layer, mullite sand is adopted for a transition layer, wood strips are inserted into the apertures after 3-4 layers of shells are made, then conventional shell making, slurry sealing and dewaxing are carried out, ventilation insertion tubes are inserted into holes after roasting is carried out, and the shells are reserved and wait for pouring; according to the invention, the battens are inserted into the long holes after the shell is manufactured, so that the long hole holes are conveniently formed after roasting, the heat dissipation condition of the cast shell is improved, the problem of the shrinkage and looseness defect of the casting is solved, the ventilation insertion pipes are inserted into the holes, the casting strength of the shell is improved, the heat dissipation effect can be further improved by ventilation according to requirements, the fire running phenomenon can be effectively prevented, the cleaning is convenient, and the production efficiency is high.
Description
Technical Field
The invention relates to the technical field of investment casting, in particular to a shell making process for a long-hole casting.
Background
At present, the investment casting production process mainly comprises three procedures of moulding, shell making and mould shell roasting and pouring, wherein the shell making procedure is to form a coating module by repeatedly circulating the wax module made in the mould making procedure through coating, sanding, hardening and air drying, and then dewaxing is carried out to form the mould shell, and a mould cavity in the shell is a part model. In the production process of castings, shell making is a very important process, and through a series of processes of slurry dipping, sand spraying and air drying, deep and long-hole castings are difficult to be dipped in slurry and sand spraying due to the inside, the strength of a formwork is low, the rejection rate is high, a machining method is adopted at present, the cost of the castings is higher, for products with slightly large aperture, the shell making materials in the holes are blocked, heat dissipation is difficult to achieve after pouring, and the defects of casting shrinkage and looseness are caused, and the existing solution method comprises the following steps: 1. after 3 layers of shells are manufactured, the shell is immersed into the slurry, the slurry is filled into the hole, and after the slurry is dried, the next layer of shell is manufactured, so that the strength of the shell is increased, the phenomenon of fire escape is prevented, but the shell is difficult to dry after grouting, and the shell manufacturing period is long; 2. when the mold is made, the ceramic core which is prefabricated, has certain normal temperature and high temperature strength, small expansion coefficient and chemical stability at high temperature is put into a mold, a wax mold is pressed, then the shell is made into a shell with the ceramic core, and the ceramic core in the inner cavity is removed after casting.
Disclosure of Invention
The invention mainly aims to provide a shell manufacturing process for a long-hole casting, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that: a long-hole casting shell manufacturing process comprises the following steps: uniformly soaking and smearing surface layer slurry on the surface of a wax mould, uniformly spraying zircon sand, hardening a hardening pool, then air-drying, then soaking and smearing transition layer slurry, and uniformly spraying mullite sand;
step two, inserting wood bars into the apertures after the transition layer shell manufacturing operation in the step one is carried out for 3-4 times;
step three, performing conventional shell making, slurry sealing and dewaxing;
step four, roasting the dewaxed shell obtained in the step three, and burning the inserted battens to enable the shell to form holes;
and step five, inserting a ventilation cannula into the hole in the step four, and waiting for pouring.
Preferably, in the second step, the wood strips are inserted 2-3 hours after the last transition layer is used for manufacturing the shell.
Preferably, the size of the wood strips in the second step is consistent with the size of the holes of the wax mould prepared shell, and the length of the wood strips is greater than that of the holes.
Preferably, the ventilation inserting pipe in the fifth step comprises a pipe body, a plurality of ventilation openings are formed in the side wall of the pipe body, the outer side wall of the pipe body is fixedly connected with a supporting arc plate through an adjusting rod, and the outer port of the pipe body is connected with an air inlet pipe.
Preferably, the outer side wall of the end part of the air inlet pipe positioned in the pipe body is fixedly connected with a sliding sealing plug, and the air inlet pipe is in sliding connection with the end part of the pipe body.
Preferably, the adjusting rod comprises a sleeve and a sliding rod, the sliding rod is connected with the sleeve in a sliding mode, and the end portion of the sliding rod is connected with the bottom of the sleeve through a spring.
Preferably, the sleeve is screwed with a fastening bolt near the side wall of the port.
Preferably, the support arc plates are three and are arranged around the pipe body in an annular array, and the outer side walls of the three support arc plates are embedded and connected with the annular rubber rings at equal intervals.
Preferably, the annular rubber ring is made of heat-resistant materials and slightly protrudes out of the outer side wall of the supporting arc plate.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the battens are inserted into the long holes after the shell is manufactured, so that the long hole holes are conveniently formed after roasting, the heat dissipation condition of the cast shell is improved, the problem of the shrinkage and looseness defect of the casting is solved, the ventilation insertion pipes are inserted into the holes, the casting strength of the shell is improved, the heat dissipation effect can be further improved by ventilation according to requirements, the fire running phenomenon can be effectively prevented, the cleaning is convenient, and the production efficiency is high.
Drawings
FIG. 1 is a schematic view of a vented cannula of the present invention;
fig. 2 is a schematic view of the structure of the adjusting rod of the present invention.
In the figure: 1. a pipe body; 2. a vent; 3. adjusting a rod; 31. a sleeve; 32. a slide bar; 33. a spring; 34. fastening a bolt; 4. supporting the arc plate; 5. an air inlet pipe; 6. sliding the sealing plug; 7. an annular rubber ring.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
A long-hole casting shell manufacturing process comprises the following steps: uniformly soaking and smearing surface layer slurry on the surface of a wax mould, uniformly spraying zircon sand, hardening a hardening pool, then air-drying, then soaking and smearing transition layer slurry, and uniformly spraying mullite sand;
step two, inserting wood bars into the apertures after the transition layer shell manufacturing operation in the step one is carried out for 3-4 times;
step three, performing conventional shell making, slurry sealing and dewaxing;
step four, roasting the dewaxed shell obtained in the step three, and burning the inserted battens to enable the shell to form holes;
and step five, inserting a ventilation cannula into the hole in the step four, and waiting for pouring.
In this embodiment, in the second step, the wood strips are inserted 2 to 3 hours after the last transition layer is used for manufacturing the shell.
In this embodiment, the size of the wood strip in the second step is the same as the size of the hole of the wax mold prepared shell, and the length of the wood strip is greater than the length of the hole.
As shown in fig. 1-2, in this embodiment, the ventilation cannula in the fifth step includes a tube body 1, a plurality of ventilation openings 2 are formed in a side wall of the tube body 1, an outer side wall of the tube body 1 is fixedly connected to a support arc plate 4 through an adjusting rod 3, and an outer port of the tube body 1 is connected to an air inlet pipe 5.
In this embodiment, the air inlet pipe 5 is located the sliding sealing plug 6 of the fixed connection of the tip lateral wall in the body 1, the air inlet pipe 5 and body 1 tip sliding connection.
In this embodiment, the adjusting lever 3 includes a sleeve 31 and a sliding rod 32, the sliding rod 32 is slidably connected to the sleeve 31, and an end of the sliding rod 32 is connected to a bottom of the sleeve 31 through a spring 33.
In this embodiment, the sleeve 31 is screwed with the fastening bolt 34 near the side wall of the port.
In this embodiment, the support arc plates 4 are three and are arranged around the pipe body 1 in an annular array, and three the outer side walls of the support arc plates 4 are embedded and connected with a plurality of annular rubber rings 7 at equal intervals.
In this embodiment, the annular rubber ring 7 is made of a heat-resistant material, and the annular rubber ring 7 slightly protrudes out of the outer side wall of the supporting arc plate 4.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (9)
1. A shell manufacturing process for long-hole castings is characterized by comprising the following steps: the method comprises the following steps:
uniformly soaking and smearing surface layer slurry on the surface of a wax mould, uniformly spraying zircon sand, hardening a hardening pool, then air-drying, then soaking and smearing transition layer slurry, and uniformly spraying mullite sand;
step two, inserting wood bars into the apertures after the transition layer shell manufacturing operation in the step one is carried out for 3-4 times;
step three, performing conventional shell making, slurry sealing and dewaxing;
step four, roasting the dewaxed shell obtained in the step three, and burning the inserted battens to enable the shell to form holes;
and step five, inserting a ventilation cannula into the hole in the step four, and waiting for pouring.
2. The long-hole casting shell manufacturing process according to claim 1, characterized in that: and in the second step, wood bars are inserted 2-3 hours after the last transition layer is used for manufacturing the shell.
3. The long-hole casting shell manufacturing process according to claim 1, characterized in that: and the size of the wood strips in the second step is consistent with the size of the holes of the wax mold prepared shell, and the length of the wood strips is greater than that of the holes.
4. The long-hole casting shell manufacturing process according to claim 1, characterized in that: the ventilation insertion pipe in the fifth step comprises a pipe body, a plurality of ventilation openings are formed in the side wall of the pipe body, the outer side wall of the pipe body is fixedly connected with a supporting arc plate through an adjusting rod, and an outer port of the pipe body is connected with an air inlet pipe.
5. The long-hole casting shell manufacturing process according to claim 4, wherein the casting shell manufacturing process comprises the following steps: the outer side wall of the end part of the air inlet pipe positioned in the pipe body is fixedly connected with a sliding sealing plug, and the air inlet pipe is in sliding connection with the end part of the pipe body.
6. The long-hole casting shell manufacturing process according to claim 4, wherein the casting shell manufacturing process comprises the following steps: the adjusting rod comprises a sleeve and a sliding rod, the sliding rod is connected with the sleeve in a sliding mode, and the end portion of the sliding rod is connected with the bottom of the sleeve through a spring.
7. The long-hole casting shell manufacturing process according to claim 6, wherein: and the side wall of the sleeve close to the port is in threaded connection with a fastening bolt.
8. The long-hole casting shell manufacturing process according to claim 4, wherein the casting shell manufacturing process comprises the following steps: the supporting arc plates are three and are arranged around the pipe body in an annular array mode, and the outer side walls of the three supporting arc plates are embedded into and connected with the annular rubber rings at equal intervals.
9. The long-hole casting shell manufacturing process according to claim 8, wherein: the annular rubber ring is made of heat-resistant materials and slightly protrudes out of the outer side wall of the supporting arc plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011532245.0A CN112620580B (en) | 2020-12-23 | 2020-12-23 | Shell making process for long hole castings |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011532245.0A CN112620580B (en) | 2020-12-23 | 2020-12-23 | Shell making process for long hole castings |
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| Publication Number | Publication Date |
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| CN112620580A true CN112620580A (en) | 2021-04-09 |
| CN112620580B CN112620580B (en) | 2023-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011532245.0A Active CN112620580B (en) | 2020-12-23 | 2020-12-23 | Shell making process for long hole castings |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114406190A (en) * | 2021-12-28 | 2022-04-29 | 东营一诚精密金属有限公司 | Process method for ensuring coaxiality of investment casting blind holes |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103464683A (en) * | 2013-09-05 | 2013-12-25 | 贵州安吉航空精密铸造有限责任公司 | Investment casting method |
| CN105364002A (en) * | 2015-10-22 | 2016-03-02 | 贵州安吉航空精密铸造有限责任公司 | Investment casting process accelerating solidification and cooling of casting |
| CN110180994A (en) * | 2019-06-24 | 2019-08-30 | 中国航发动力股份有限公司 | A kind of preparation method of the elongated blind hole investment-casting shell of band |
| CN110722104A (en) * | 2019-11-26 | 2020-01-24 | 温州万虹阀门有限公司 | Precision casting process of small-diameter deep-hole valve joint |
| CN210334250U (en) * | 2019-07-11 | 2020-04-17 | 洛阳鹏起实业有限公司 | Air drying device for inner cavity of investment casting shell |
-
2020
- 2020-12-23 CN CN202011532245.0A patent/CN112620580B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103464683A (en) * | 2013-09-05 | 2013-12-25 | 贵州安吉航空精密铸造有限责任公司 | Investment casting method |
| CN105364002A (en) * | 2015-10-22 | 2016-03-02 | 贵州安吉航空精密铸造有限责任公司 | Investment casting process accelerating solidification and cooling of casting |
| CN110180994A (en) * | 2019-06-24 | 2019-08-30 | 中国航发动力股份有限公司 | A kind of preparation method of the elongated blind hole investment-casting shell of band |
| CN210334250U (en) * | 2019-07-11 | 2020-04-17 | 洛阳鹏起实业有限公司 | Air drying device for inner cavity of investment casting shell |
| CN110722104A (en) * | 2019-11-26 | 2020-01-24 | 温州万虹阀门有限公司 | Precision casting process of small-diameter deep-hole valve joint |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114406190A (en) * | 2021-12-28 | 2022-04-29 | 东营一诚精密金属有限公司 | Process method for ensuring coaxiality of investment casting blind holes |
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| CN112620580B (en) | 2023-05-26 |
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