CN111992679A - Coating method for thin-wall hollow casting shell - Google Patents
Coating method for thin-wall hollow casting shell Download PDFInfo
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- CN111992679A CN111992679A CN202010856694.4A CN202010856694A CN111992679A CN 111992679 A CN111992679 A CN 111992679A CN 202010856694 A CN202010856694 A CN 202010856694A CN 111992679 A CN111992679 A CN 111992679A
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- shell
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C23/00—Tools; Devices not mentioned before for moulding
- B22C23/02—Devices for coating moulds or cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/10—Compacting by jarring devices only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to a coating method of a thin-wall hollow casting shell, which comprises the following steps: coating and hanging a plurality of layers of bottom layer slurry on the surface of the shell and drying the bottom layer slurry; preparing a core rod; the surface layer slurry is coated to fix the core bone on the bottom layer slurry, and the core bone is adopted to remove the internal stress of the surface layer slurry; filling refractory sand in the shell, vibrating by using a vibrating wire, and sealing by using sealing slurry; coating and hanging a reinforcing layer; removing all refractory sand; by adopting the technical scheme of the invention, the inner stress of the surface layer slurry is fully removed by adopting the core rod, so that the reinforcing layer can be fully connected with the surface of the shell, the integral structural strength of the shell is improved, the refractory sand is fully filled and densely filled by fully vibrating the refractory sand by using the vibrating wire, and finally, the refractory sand is conveniently and thoroughly removed in the sand removing process, the surface quality of a finally formed casting is improved, and the qualification rate of a cast product is improved.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a coating method of a thin-wall hollow casting shell.
Background
In the casting forming process, firstly, a shell is prepared according to the shape of a product, then, a reinforcing layer is coated on the surface of the shell according to the requirement, the process steps such as roasting and the like are carried out to enhance the strength of the shell, finally, a liquid metal material is poured and smelted into the shell, and the shell is cast and formed after the metal material is condensed.
Disclosure of Invention
In order to solve the technical problem, the invention provides a coating method of a thin-wall hollow casting shell.
The invention provides a coating method of a thin-wall hollow casting shell, which comprises the following steps:
the method comprises the following steps: providing a shell, coating and hanging a plurality of layers of bottom layer slurry on the surface of the shell, and drying the bottom layer slurry;
step two: preparing a core rod;
step three: placing the core rod in the second step on the surface of the dried bottom layer slurry in the first step, and then coating surface layer slurry to fix the core rod;
step four: repeating the step three for a plurality of times;
step five: after the surface layer slurry is dried, filling refractory sand in the inner cavity of the shell, tamping by using a vibrating wire, and sealing the opening end of the inner cavity of the shell by using sealing slurry;
step six: after the sealing slurry is dried, coating a reinforcing layer on the surface of the shell;
step seven: and removing all the refractory sand in the shell, and finishing coating.
And coating 2-3 layers of the bottom layer slurry in the step one.
The coating method of the thin-wall hollow casting shell further comprises the following steps:
and in the process of the first step, coating a layer of silica sol between two adjacent layers of bottom layer slurry to serve as a transition layer.
The viscosity of the surface layer slurry in the third step is 60-70 s.
In the second step, the core wire is a steel wire with the diameter of phi 6-phi 8 mm.
And step five, the refractory sand is white corundum sand screened by a 100-120-mesh screen.
And in the fifth step, the vibrating wire is an iron wire.
In the fifth step to the sixth step, the sealing slurry is a mixture obtained by uniformly mixing the surface layer slurry and mullite powder screened by a 200-325-mesh screen into a paste.
And seventhly, removing all the refractory sand in the shell by adopting a hydraulic sand removing mode.
The invention has the beneficial effects that: by adopting the technical scheme of the invention, the mode of coating the surface layer slurry layer by layer is adopted, and the inner stress of the surface layer slurry is fully removed by adopting the core rod, so that the reinforcing layer can be fully connected with the surface of the shell, the integral structural strength of the shell is improved, the vibrating wire is used for fully vibrating the refractory sand, the air in the refractory sand escapes, the refractory sand is densely filled, and finally the refractory sand cannot be adsorbed on the surface of the shell due to the absence of the air in the sand cleaning process, so that the refractory sand is conveniently and thoroughly removed, a foundation is laid for improving the surface quality of a finally formed casting, and the qualification rate of a cast product is favorably improved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solution of the present invention is further explained with reference to the accompanying drawings, but the claimed protection scope is not limited thereto;
the invention provides a coating method of a thin-wall hollow casting shell, as shown in figure 1, comprising the following steps:
the method comprises the following steps: providing a shell, coating and hanging a plurality of layers of bottom layer slurry on the surface of the shell, and drying the bottom layer slurry; further, in the step one, 2-3 layers of bottom layer slurry are coated. In addition, during the process of the step one, a layer of silica sol is coated between two adjacent layers of bottom layer slurry to be used as a transition layer.
Step two: preparing a core rod;
step three: placing the core bone in the second step on the surface of the dried bottom layer slurry in the first step, and then coating the surface layer slurry to fix the core bone; in addition, the viscosity of the surface layer slurry in the third step is 60s-70 s. Preferably, the core wire is a steel wire having a diameter of phi 6 to phi 8 mm.
Step four: repeating the step three for a plurality of times;
step five: after the surface layer slurry is dried, filling refractory sand in the inner cavity of the shell, tamping by using a vibrating wire, and sealing the opening end of the inner cavity of the shell by using sealing slurry; furthermore, the refractory sand is white corundum sand screened by a 100-120-mesh screen. And in the fifth step, the vibrating wire is an iron wire. The sealing slurry is a mixture obtained by uniformly mixing surface layer slurry and mullite powder screened by a 200-325-mesh screen into a muddy state. And seventhly, removing all the refractory sand in the shell by adopting a hydraulic sand removing mode.
Step six: after the sealing slurry is dried, coating a reinforcing layer on the surface of the shell;
step seven: and removing all the refractory sand in the shell, and finishing coating.
By adopting the technical scheme of the invention, the mode of coating the surface layer slurry layer by layer is adopted, and the inner stress of the surface layer slurry is fully removed by adopting the core rod, so that the reinforcing layer can be fully connected with the surface of the shell, the integral structural strength of the shell is improved, the vibrating wire is used for fully vibrating the refractory sand, the air in the refractory sand escapes, the refractory sand is densely filled, and finally the refractory sand cannot be adsorbed on the surface of the shell due to the absence of the air in the sand cleaning process, so that the refractory sand is conveniently and thoroughly removed, a foundation is laid for improving the surface quality of a finally formed casting, and the qualification rate of a cast product is favorably improved.
Claims (9)
1. A coating method for a thin-wall hollow casting shell is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: providing a shell, coating and hanging a plurality of layers of bottom layer slurry on the surface of the shell, and drying the bottom layer slurry;
step two: preparing a core rod;
step three: placing the core rod in the second step on the surface of the dried bottom layer slurry in the first step, and then coating surface layer slurry to fix the core rod;
step four: repeating the step three for a plurality of times;
step five: after the surface layer slurry is dried, filling refractory sand in the inner cavity of the shell, tamping by using a vibrating wire, and sealing the opening end of the inner cavity of the shell by using sealing slurry;
step six: after the sealing slurry is dried, coating a reinforcing layer on the surface of the shell;
step seven: and removing all the refractory sand in the shell, and finishing coating.
2. The method of coating a thin-walled hollow casting shell as claimed in claim 1, wherein: and coating 2-3 layers of the bottom layer slurry in the step one.
3. The method of coating a thin-walled hollow casting shell as claimed in claim 1, wherein: the coating method of the thin-wall hollow casting shell further comprises the following steps:
and in the process of the first step, coating a layer of silica sol between two adjacent layers of bottom layer slurry to serve as a transition layer.
4. The method of coating a thin-walled hollow casting shell as claimed in claim 1, wherein: the viscosity of the surface layer slurry in the third step is 60-70 s.
5. The method of coating a thin-walled hollow casting shell as claimed in claim 1, wherein: in the second step, the core wire is a steel wire with the diameter of phi 6-phi 8 mm.
6. The method of coating a thin-walled hollow casting shell as claimed in claim 1, wherein: and step five, the refractory sand is white corundum sand screened by a 100-120-mesh screen.
7. The method of coating a thin-walled hollow casting shell as claimed in claim 1, wherein: and in the fifth step, the vibrating wire is an iron wire.
8. The method of coating a thin-walled hollow casting shell as claimed in claim 1, wherein: in the fifth step to the sixth step, the sealing slurry is a mixture obtained by uniformly mixing the surface layer slurry and mullite powder screened by a 200-325-mesh screen into a paste.
9. The method of coating a thin-walled hollow casting shell as claimed in claim 1, wherein: and seventhly, removing all the refractory sand in the shell by adopting a hydraulic sand removing mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010856694.4A CN111992679A (en) | 2020-08-24 | 2020-08-24 | Coating method for thin-wall hollow casting shell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010856694.4A CN111992679A (en) | 2020-08-24 | 2020-08-24 | Coating method for thin-wall hollow casting shell |
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| Publication Number | Publication Date |
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| CN111992679A true CN111992679A (en) | 2020-11-27 |
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| CN202010856694.4A Pending CN111992679A (en) | 2020-08-24 | 2020-08-24 | Coating method for thin-wall hollow casting shell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210927A (en) * | 2021-12-31 | 2022-03-22 | 毕普帕罗洛江苏工程技术有限公司 | Shell-layer reinforcing process for inhibiting shell cracking |
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| JPH0615409A (en) * | 1992-06-30 | 1994-01-25 | Showa Seiki Kogyo Kk | Manufacture of metallic mold for rubber with non-splitting structure |
| JP2007030027A (en) * | 2005-07-29 | 2007-02-08 | Toyota Motor Corp | Method for forming water soluble core, and method for casting aluminum alloy |
| CN101406934A (en) * | 2008-11-13 | 2009-04-15 | 莱芜市泰钢新材料有限责任公司 | Shell-making method of investment casting of flow guiding body |
| CN102601305A (en) * | 2012-03-26 | 2012-07-25 | 大连远东美连精工有限公司 | Investment casting method by use of entity shell making |
| CN102806314A (en) * | 2012-09-03 | 2012-12-05 | 贵州安吉航空精密铸造有限责任公司 | Casting method for aluminum alloy thin-wall fine-hole casting |
| CN104162634A (en) * | 2013-08-25 | 2014-11-26 | 浙江天瑞钢业有限公司 | Casting method of narrow-tunnel wide-tunnel wall surface casting |
| CN104985138A (en) * | 2015-08-08 | 2015-10-21 | 江苏万恒铸业有限公司 | Mold shell spray rinsing device |
| CN105385862A (en) * | 2015-11-19 | 2016-03-09 | 淄博永辰环境影响评价有限公司 | Manufacturing method for medical artificial limb |
| 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 |
-
2020
- 2020-08-24 CN CN202010856694.4A patent/CN111992679A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0615409A (en) * | 1992-06-30 | 1994-01-25 | Showa Seiki Kogyo Kk | Manufacture of metallic mold for rubber with non-splitting structure |
| JP2007030027A (en) * | 2005-07-29 | 2007-02-08 | Toyota Motor Corp | Method for forming water soluble core, and method for casting aluminum alloy |
| CN101406934A (en) * | 2008-11-13 | 2009-04-15 | 莱芜市泰钢新材料有限责任公司 | Shell-making method of investment casting of flow guiding body |
| CN102601305A (en) * | 2012-03-26 | 2012-07-25 | 大连远东美连精工有限公司 | Investment casting method by use of entity shell making |
| CN102806314A (en) * | 2012-09-03 | 2012-12-05 | 贵州安吉航空精密铸造有限责任公司 | Casting method for aluminum alloy thin-wall fine-hole casting |
| CN104162634A (en) * | 2013-08-25 | 2014-11-26 | 浙江天瑞钢业有限公司 | Casting method of narrow-tunnel wide-tunnel wall surface casting |
| CN104985138A (en) * | 2015-08-08 | 2015-10-21 | 江苏万恒铸业有限公司 | Mold shell spray rinsing device |
| CN105385862A (en) * | 2015-11-19 | 2016-03-09 | 淄博永辰环境影响评价有限公司 | Manufacturing method for medical artificial limb |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210927A (en) * | 2021-12-31 | 2022-03-22 | 毕普帕罗洛江苏工程技术有限公司 | Shell-layer reinforcing process for inhibiting shell cracking |
| CN114210927B (en) * | 2021-12-31 | 2024-06-11 | 毕普帕罗洛江苏工程技术有限公司 | Shell layer reinforcing process for inhibiting shell cracking |
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Application publication date: 20201127 |
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