CN113798436A - Forming method of valve shell casting - Google Patents
Forming method of valve shell casting Download PDFInfo
- Publication number
- CN113798436A CN113798436A CN202110993160.0A CN202110993160A CN113798436A CN 113798436 A CN113798436 A CN 113798436A CN 202110993160 A CN202110993160 A CN 202110993160A CN 113798436 A CN113798436 A CN 113798436A
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- CN
- China
- Prior art keywords
- sand mold
- casting
- forming
- parting surface
- valve housing
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Classifications
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
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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
- B22C9/103—Multipart cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
- B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention belongs to the technical field of casting, and relates to a forming method of a valve shell casting, which comprises the following steps: selecting a casting center surface as a parting surface of a casting sand mold; dividing the casting sand mold into a first sand mold and a second sand mold by taking a parting surface as a reference; the sand mold I is used for forming the outer contour of the lower half part of the parting surface of the casting sand mold; the sand mold is used for forming the outer contour of the upper half part of the parting surface of the casting sand mold and the inner contour of the casting; forming a casting cavity of the casting after the first sand mold and the second sand mold are assembled; compared with the prior art, the technical scheme of the invention reduces the manufacturing procedures of the die, saves the cost of the die, shortens the production period, adopts 3D printing to form the sand mold, obviously improves the precision of the sand mold, and can improve the dimensional qualification rate of semi-finished products and castings.
Description
Technical Field
The invention belongs to the technical field of casting, and relates to a forming method of a valve shell casting.
Background
The valve casing casting generally refers to a casting with a three-way structure, a four-way structure and a five-way structure which are formed by two or more than two T-shaped structures in a penetrating way, a full-mold molding forming method is generally adopted during casting molding, an outer mold is formed by a full-mold die, an inner cavity adopts a core-drawing way, wherein the outer mold forms the outer contour of the casting, and a sand core forms the inner contour of the casting; this shaping scheme needs to adopt two casees to mould, turns over the case and carries out the case modeling again after the case modeling is accomplished down, still needs the core simultaneously, later unpacks and takes out the mould, and the core closes the case down at last. For some valve shell castings with small outlines, the casting forming method is complex in process and long in production period, and production and delivery of the castings are seriously affected.
Disclosure of Invention
The invention aims to provide a forming method of a valve shell casting, which aims to solve the problems of complex process, long production period and the like of a casting forming method caused by the adoption of the method in the prior art.
A method of forming a valve housing casting comprising the steps of:
selecting a casting center surface as a parting surface of a casting sand mold;
dividing the casting sand mold into a first sand mold and a second sand mold by taking a parting surface as a reference;
the sand mold I is used for forming the outer contour of the lower half part of the parting surface of the casting sand mold;
the sand mold is used for forming the outer contour of the upper half part of the parting surface of the casting sand mold and the inner contour of the casting;
and the first sand mold and the second sand mold are assembled to form a casting cavity of the casting.
In order to better realize the invention, the center plane of the casting is the center plane of the casting nozzle.
In order to better realize the invention, the molding method further comprises the step of arranging an inner sprue hole and a cold iron hole on the first sand mold.
In order to better implement the invention, the step of the molding method further comprises the step of arranging an inner sprue below the flange at the nozzle of the casting.
In order to better implement the invention, the forming method further comprises the step of arranging a chilling block at the arc top of the bottom of the casting.
In order to better implement the invention, the molding method further comprises the step of arranging a riser and a patch on the second sand mold.
In order to better realize the invention, a first core head is arranged at the pipe orifice of the first sand mould, and a second core head matched with the first core head is arranged at the pipe orifice of the second sand mould.
In order to better realize the invention, the first core print and the second core print are arranged to be polygonal, so that the operation is convenient, and the matching precision of the first sand mold and the second sand mold during the mould assembling process is ensured.
In order to better realize the invention, the fit clearance between the first core print and the second core print is 0.5mm to 1 mm.
In order to better implement the invention, the forming method further comprises the following steps: and the first sand mold and the second sand mold are formed by 3D printing, and when the box assembling operation is carried out, the first sand mold is placed in a casting pit, and then the second sand mold is installed according to the matching of the positions of the first core head and the second core head.
In order to better realize the invention, after the first sand mold and the second sand mold are printed and formed, the surfaces of the first sand mold and the second sand mold are cleaned and brushed, and after the coating is dried, the box assembling operation is carried out.
Compared with the prior art, the forming method of the valve shell casting reduces the manufacturing process of the die, saves the die cost, shortens the production period, adopts 3D printing to form the sand mold, obviously improves the precision of the sand mold, and can improve the dimensional qualification rate of semi-finished products and castings.
Drawings
FIG. 1 is a schematic structural diagram of a first sand mold in the embodiment;
FIG. 2 is a schematic structural diagram of a second sand mold in the embodiment at a certain angle;
FIG. 3 is a schematic structural diagram of a second sand mold in the embodiment from a different angle from that of FIG. 2;
100-sand mold I; 200-sand mold II; 110-a sprue hole; 120-cold iron hole; 130-core head one; 210-riser; 220-patch; 230-core print two.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the embodiment, a certain valve casing is taken as an example, the valve casing comprises three pipe orifices, the central planes of the three pipe orifices are the same, namely the three pipe orifices are coaxial, the molding scheme mainly adopts 3D printing to complete the printing and processing of the sand mold, and the processes of mold production, molding and core making in the prior art are avoided; according to the forming method provided by the embodiment, the whole sand mold is divided into an upper part and a lower part according to the structure of a valve shell casting, and the upper part and the lower part are both formed by 3D printing, wherein one sand mold forms a cavity of the lower half outline of the casting, and the other sand mold forms a cavity of the upper half outline and the inner outline of the casting; the method comprises the following specific steps:
step S01, casting process design: a riser is arranged at the position of the thick large part of the casting, namely the riser is arranged at the intersection of the pipe orifice flange and the pipe, and patches are arranged on two sides of the riser to feed downwards; and a chill is arranged at the bottom of the casting and is used for dividing a feeding area of a riser.
And step S02, selecting the center plane of the casting as the parting plane of the sand mold of the casting, and the center plane of the casting as the center plane of the pipe orifice of the casting.
Step S03, dividing the casting sand mold into a first sand mold 100 and a second sand mold 200 by taking a parting surface as a reference; the first sand mold 100 is used for forming the outer contour of the lower half part of the parting surface of the casting sand mold; the second sand mold 200 is used for forming the outer contour of the upper half of the parting surface of the sand mold of the casting and the inner contour of the casting.
Designing a sand mold I100: an inner sprue is arranged below a flange at the pipe orifice of the casting, a chiller is arranged at the arc top of the bottom of the casting, and an inner sprue hole 110 and a chiller hole 120 are arranged on the first sand mold according to the positions of the inner sprue and the chiller.
Designing a second sand mold: and arranging a riser 210 and a patch 220 on the second sand mold 200 according to the positions of the riser and the patch on the casting process.
Step S05, arranging a first core head 130 at the nozzle of the first sand mold 100, and arranging a second core head 230 matched with the first core head 130 at the nozzle of the second sand mold 200; the first core print 130 and the second core print 230 are arranged in a polygon shape, so that the operation is convenient, and the matching precision of the first sand mold 100 and the second sand mold 200 during the box assembling process is ensured.
Specifically, due to the high dimensional accuracy of the 3D printing sand mold, the fit clearance between the first core print 130 and the second core print 230 is 0.5mm to 1 mm.
And step S04, forming a casting cavity after the first sand mold 100 and the second sand mold 200 are assembled.
Specifically, a first sand mold 100 and a second sand mold 200 are formed through 3D printing, after printing is completed, the surfaces of the sand molds are cleaned and brushed, and after the coating is dried, box assembling operation is performed; when the box assembling operation is carried out, the first sand mold 100 is placed in the casting pit, and then the second sand mold 200 is installed according to the matching of the positions of the first core print 130 and the second core print 230.
The implementation provides a forming method of a valve shell casting, which belongs to a valve shell mould-free forming scheme, does not need to manufacture a mould and a core box, and omits the processes of core making and partial forming; adopt 3D to print the sand mould, only need print two sand moulds according to the structure of valve casing foundry goods, mould after the mould assembling can, for one case moulding, two case moulding + case turnover process of having avoided using the mould has saved the mould cost, has showing and has shortened production cycle.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A method for forming a valve housing casting, comprising the steps of:
selecting a casting center surface as a parting surface of a casting sand mold;
dividing the casting sand mold into a first sand mold and a second sand mold by taking a parting surface as a reference;
the sand mold I is used for forming the outer contour of the lower half part of the parting surface of the casting sand mold;
the sand mold is used for forming the outer contour of the upper half part of the parting surface of the casting sand mold and the inner contour of the casting;
and the first sand mold and the second sand mold are assembled to form a casting cavity of the casting.
2. The method of forming a valve housing casting of claim 1 wherein the casting centerplane is a centerplane of a casting nozzle.
3. A method of forming a valve housing casting according to claim 1, further comprising the step of providing a sprue hole and a chill hole in said first sand mold.
4. A method of forming a valve housing casting according to claim 1, further comprising the step of providing risers and patches on said second sand mold.
5. A method of forming a valve housing casting according to claim 2, wherein a first core print is provided at the nozzle of the first sand mold, and a second core print matching the first core print is provided at the nozzle of the second sand mold.
6. The method of forming a valve housing casting of claim 5 wherein said first core print and said second core print are provided in a polygonal shape.
7. The method of forming a valve housing casting of claim 5, wherein the fit clearance of the first core print and the second core print is 0.5mm to 1 mm.
8. The method of forming a valve housing casting of claim 1, wherein the method steps further comprise: and the first sand mold and the second sand mold are formed by 3D printing, and when the box assembling operation is carried out, the first sand mold is placed in a casting pit, and then the second sand mold is installed according to the matching of the positions of the first core head and the second core head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110993160.0A CN113798436A (en) | 2021-08-30 | 2021-08-30 | Forming method of valve shell casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110993160.0A CN113798436A (en) | 2021-08-30 | 2021-08-30 | Forming method of valve shell casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113798436A true CN113798436A (en) | 2021-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110993160.0A Pending CN113798436A (en) | 2021-08-30 | 2021-08-30 | Forming method of valve shell casting |
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| CN (1) | CN113798436A (en) |
Citations (12)
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| CN101462149A (en) * | 2009-01-15 | 2009-06-24 | 洛阳市兴荣工业有限公司 | Foundry technique method of lower support board of ball type support |
| CN102463326A (en) * | 2010-10-28 | 2012-05-23 | 南车戚墅堰机车车辆工艺研究所有限公司 | Casting die for valve shell casting of marine diesel engine and casting process of valve shell |
| CN103056325A (en) * | 2012-12-03 | 2013-04-24 | 南车戚墅堰机车车辆工艺研究所有限公司 | Method for casting air sucking valve steel casting part |
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| CN105382203A (en) * | 2015-10-29 | 2016-03-09 | 共享铸钢有限公司 | Novel casting method for steam turbine valve shell casting |
| CN105458173A (en) * | 2015-12-28 | 2016-04-06 | 共享铸钢有限公司 | Molding method for air cylinder casting of steam turbine |
| CN107042287A (en) * | 2017-02-28 | 2017-08-15 | 共享铸钢有限公司 | A kind of casting method of steam turbine high pressure main air valve casting |
| CN107803467A (en) * | 2017-10-31 | 2018-03-16 | 共享铸钢有限公司 | A kind of running gate system of large-scale valve casing class steel-casting |
| CN108339938A (en) * | 2018-03-30 | 2018-07-31 | 共享智能铸造产业创新中心有限公司 | A kind of core pattern integral type formative method of cylinder cap casting |
| CN109128010A (en) * | 2018-10-17 | 2019-01-04 | 共享智能铸造产业创新中心有限公司 | A kind of casting method of hydraulic valve class casting |
| CN111940675A (en) * | 2020-08-18 | 2020-11-17 | 四川省金镭重工有限公司 | Novel casting method of steam turbine combined steam valve casing steel casting |
| CN213002497U (en) * | 2020-07-31 | 2021-04-20 | 四川共享铸造有限公司 | 3D printing volute sand core |
-
2021
- 2021-08-30 CN CN202110993160.0A patent/CN113798436A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101462149A (en) * | 2009-01-15 | 2009-06-24 | 洛阳市兴荣工业有限公司 | Foundry technique method of lower support board of ball type support |
| CN102463326A (en) * | 2010-10-28 | 2012-05-23 | 南车戚墅堰机车车辆工艺研究所有限公司 | Casting die for valve shell casting of marine diesel engine and casting process of valve shell |
| CN103056325A (en) * | 2012-12-03 | 2013-04-24 | 南车戚墅堰机车车辆工艺研究所有限公司 | Method for casting air sucking valve steel casting part |
| CN105215271A (en) * | 2015-10-29 | 2016-01-06 | 共享铸钢有限公司 | A kind of cored-up mould sand mould structure of gear box casing foundry goods and cored-up mould method |
| CN105382203A (en) * | 2015-10-29 | 2016-03-09 | 共享铸钢有限公司 | Novel casting method for steam turbine valve shell casting |
| CN105458173A (en) * | 2015-12-28 | 2016-04-06 | 共享铸钢有限公司 | Molding method for air cylinder casting of steam turbine |
| CN107042287A (en) * | 2017-02-28 | 2017-08-15 | 共享铸钢有限公司 | A kind of casting method of steam turbine high pressure main air valve casting |
| CN107803467A (en) * | 2017-10-31 | 2018-03-16 | 共享铸钢有限公司 | A kind of running gate system of large-scale valve casing class steel-casting |
| CN108339938A (en) * | 2018-03-30 | 2018-07-31 | 共享智能铸造产业创新中心有限公司 | A kind of core pattern integral type formative method of cylinder cap casting |
| CN109128010A (en) * | 2018-10-17 | 2019-01-04 | 共享智能铸造产业创新中心有限公司 | A kind of casting method of hydraulic valve class casting |
| CN213002497U (en) * | 2020-07-31 | 2021-04-20 | 四川共享铸造有限公司 | 3D printing volute sand core |
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