CN102259167B - Method for casting turbocharger encloser casting - Google Patents
Method for casting turbocharger encloser casting Download PDFInfo
- Publication number
- CN102259167B CN102259167B CN 201010184267 CN201010184267A CN102259167B CN 102259167 B CN102259167 B CN 102259167B CN 201010184267 CN201010184267 CN 201010184267 CN 201010184267 A CN201010184267 A CN 201010184267A CN 102259167 B CN102259167 B CN 102259167B
- Authority
- CN
- China
- Prior art keywords
- casting
- inovulant
- iron liquid
- foundry goods
- ingate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a method for casting a turbocharger encloser, comprising the following steps: mulling, molding, manufacturing cores, integrating, smelting furnace burden, tapping, nodulizing, inoculating, pouring, cooling, unpacking, cleaning castings and checking product quality; designing a template into one type comprising 2-8 piece; adopting a completely symmetrical template layout; correspondingly arranging two to eight casting cavities; and casting by the slice-type ingate distributed pouring technology: and after melted iron enters a direct pouring gate, the melted iron passes through a filter provided with a ceramic filter screen below the direct pouring gate, and flows into a horizontal pouring gate, and then the melted iron enters the casting cavity via the ingate to fill in the cavity, wherein the pouring temperature is 1380-1460DEG C, and the top end surface of a far-end side opposite to the ingate inlet of the casting in each casting cavity is provided with two heat-insulation dead heads for feeding. The tensile strength of the casting body is more than or equal to 400MPa, the yield strength is more than or equal to 250MPa, the percentage elongation is more than or equal to 15%, the body hardness is 130-180HBS, the metallographic structure ferrite is more than or equal to 90%, the percent of spheroidization is more than or equal to 90%, the size of graphite is 4-7 grades, and no carbide is permitted to exist.
Description
Technical field
The present invention relates to a kind of casting method, particularly a kind of casting method of turbocharger case foundry goods.
Background technology
The turbine case is the key components and parts of marine turbosupercharger, because the turbocharger operation environment is abominable, must guarantee that inner high temperature compressed gas is stored in volute under high pressure, therefore require the casing component material to have good dense structure's property and higher toughness.
For above-mentioned requirements, the parts regulation ball China ink cast iron QT400-15 trade mark.The mechanical performance of foundry goods will satisfy tensile strength 〉=400MPa, yield strength 〉=250MPa, percentage elongation 〉=15%, body hardness 130～180HBS; Metallographic structure requires ferrite 〉=90%, nodularization rate 〉=90%, and 4～7 grades of graphite sizes have not allowed carbide to exist.Interiors of products does not allow to exist any casting flaw.The technical indicator characteristics of this product are: require ferrite 〉=90%, need in production process raw material are strictly controlled.
The working environment of turbocharger case foundry goods is more abominable, therefore very high to the material requirement of foundry goods, product detects and need in each appointed part sampling of body, satisfy tensile strength 〉=400MPa, yield strength 〉=250MPa, percentage elongation 〉=15%, hardness 130～180HBS.
These parts have very high requirement to surface quality of continuous castings, especially do not allow the existence of the Appearance quality defects such as scab, burr.
Therefore how to satisfy above-mentioned specification requirement, become the key of successfully casting this foundry goods.
Summary of the invention
The turbocharger case foundry goods of producing the purpose of this invention is to provide a kind of casting method of turbocharger case, so that can satisfy above-mentioned specification requirement.
For achieving the above object, the technical solution used in the present invention is:
The casting method of turbocharger case, its step comprise mulling, moulding, coremaking, mould assembly, furnace charge melting, tap a blast furnace nodularization and inoculation, cast, cooling, unpacking, casting cleaning and product quality inspection; It is characterized in that: template is designed to two～eight, a type, takes the template layout of full symmetric, and correspondence is established two～eight foundry goods die cavities; In casting technique, adopt several sheet type ingate distributing pouring technologies: the filter that is provided with foam ceramic filter after iron liquid enters from sprue through sprue below, flow into simultaneously the cross gate of some full symmetrics, enter the foundry goods die cavity via the sheet type ingate respectively afterwards, be full of die cavity; Pouring temperature is controlled at 1380～1460 ℃; The top end face of each foundry goods die cavity in the distal side of relative foundry goods ingate import arranges two insulated feeders and carries out feeding.
The spheroidization and inoculation treatment process of tapping a blast furnace of the present invention comprises that tap a blast furnace spheroidising and ferrosilicon inovulant breed two links for twice.The nodularization dosage that adds is 1.0～2.5% of the melting amount of tapping a blast furnace, and the chemical component weight percentage of nodulizer is: Mg 5.0～7.5%, RE 1.0～4.0%, Si 35～48%, Ca 1.0～3.0% and Fe surplus, the granularity of nodulizer are 3～25mm.Described inovulant breeds the ferrosilicon inovulant that adds iron liquid gross weight 0.2～0.5% after the nodularization of namely once tapping a blast furnace for twice, stir subsequently and skim and add iron liquid, and breed for the second time, the ferrosilicon inovulant with 0.2～0.5% is added to envelope and carries out the rabbling hoe slag.The granularity of ferrosilicon inovulant used is 3～25mm, and the chemical component weight percentage of ferrosilicon inovulant is Si 72～75%, Al 0.4～1.5%, Ca 0.4～1.0% and Fe surplus.
In described cast step, iron liquid will guarantee that the iron liquid casting temperature is at 1380～1460 ℃ after the nodulizer inoculation.Adopt sulphur oxygen inovulant to carry out current-following inoculation in casting process, sulphur oxygen inovulant granularity used is 0.1～1.0mm, chemical component weight percentage is Si 70～76%, Al0.75～1.25%, Ca 0.75～1.25%, Ce 1.5～2.0%, S 0.5～0.8%, O 0.3～0.5% and Fe surplus, and the percentage that addition accounts for iron liquid total amount is 0.05～0.2%.The chemical component weight percentage of last cast product is: C 3.2～3.8%, Si 2.0～3.0%, Mn≤0.45%, P≤0.07%, S≤0.03%, RE 0.01～0.04%, Mg 0.02～0.08% and Fe surplus.
Product after above melting spheroidization and inoculation processing makes cast has the metallographic structure of nodularization rate 〉=90%, ferrite 〉=90%, carbides-free, to guarantee the mechanical performance requirement of product.
In order to obtain not have defective cast product, taked following measures on technique:
(1) because this casting dimension is less, be designed to four, a type, take the template layout of full symmetric, guaranteed that four foundry goods are in identical state in cavity filling process, and then obtain the identical foundry goods of quality state, for quality testing afterwards provides assurance and foundation.
(2) adopt a plurality of sheet type ingate distributing pouring technologies: have the filter of foam ceramic filter to flow into simultaneously the cross gate of four full symmetrics through the below after iron liquid enters from sprue, enter the foundry goods die cavity via four thin slice ingates respectively afterwards; Guarantee that pouring temperature is controlled at 1380～1460 ℃, this technological measure can guarantee that cast product does not produce cold shut and gas hole defect.
(3) filter iron liquid at sprue bottom placement floamed ceramics filtrating piece, remove the impurity in iron liquid, thereby prevent that product from producing dreg defect.
(4) in the cast top thicker position of ingate offside, 4 pairs of foundry goods of two insulated feeders are set respectively and carry out feeding, guarantee to obtain the complete foundry goods of dense structure.
(5) be coated with material process at step of overall modelling, do not adopt traditional brushing mode in order to obtain clear cast(ing) surface attractive in appearance, but respectively core and external form are adopted comparatively advanced dipping process and flowcoating process, be about to the core working face and immerse in coating and adopt coating to flow through the formal coating of mold cavity surface, the brushing vestige and the coating that produce when these two kinds of techniques can be avoided brushing are effectively piled up at the die cavity wedge angle.
Key technology of the present invention is:
In iron casting was produced, the mechanical performance index that make the mechanical performance of foundry goods body reach trade mark regulation was the very difficult thing of part.In addition the mechanical performance specified point of this product has five positions, and these five positions almost are evenly distributed on each position of foundry goods.This just makes technical difficulty greatly increase.Reach this specification requirement of cast product, the cast product of production is reached:
(1) each position of foundry goods does not allow to have any casting flaw: comprise that foundry goods inside can not exist micro-shrinkage porosite and dreg defect;
(2) metallographic structure at each position of foundry goods will reach basically identical: comprise that the nodularization rate all should be good (all reach 〉=90%), and matrix will be consistent (ferrite all should more than 90%).
In order to reach this two production control technical indicators, the test of the selection (being position and the quantity of rising head) of the injection mode of iron liquid on casting technique (being position and the quantity of ingate) and rising head determines it is very important.Because in the time of will making casting solidification by the adjustment of these two factors on casting technique, the heat distribution of foundry goods each several part is in more balanced state.Through test of many times, after constantly change the position and quantity of pouring and riser systems, just reach technique ideal effect of the present invention at last.
The invention has the beneficial effects as follows:
The present invention adopts the layout designs of many, a type in technological design, adopt end face distributing pouring technology, and insulated feeder is placed in comparatively thick large position at the top of foundry goods, the utilization rate of the molding sand that effectively improves, also saved production cost for company when enhancing productivity, the layout of full symmetric has also guaranteed the uniformity on a plurality of casting qualities of same case, for random sampling Detection work afterwards provides rational foundation; Open running gate system is conducive to realize filling fast the type effect, has effectively overcome cold shut and gas hole defect that thin-section casting very easily produces; The sheet type ingate that disperses avoided the undue concentration of heat, thereby eliminated the shrinkage porosite that upper surface thicker position may occur.
After adopting casting method of the present invention, the turbocharger case foundry goods tensile strength 〉=400MPa, the yield strength 〉=250MPa that produce, percentage elongation 〉=15%, body hardness 130～180HBS; Metallographic structure requires ferrite 〉=90%, nodularization rate 〉=90%, and 4～7 grades of graphite sizes, carbides-free exists.Each position of foundry goods exists without any casting flaw, meets client's specification requirement fully.
Description of drawings
Fig. 1 is the schematic diagram of one embodiment of the invention.
Fig. 2 is the cutaway view of one embodiment of the invention medium casting die cavity.
The specific embodiment
The present invention will be further described below in conjunction with drawings and Examples.
Embodiment 1
Referring to Fig. 1, Fig. 2, the casting method of marine turbosupercharger case foundry goods of the present invention comprises the steps:
1) mulling, moulding and coremaking
Marine turbosupercharger case foundry goods carries out moulding after adopting the mixed furan resin self curing sand processed of automatic pug mixer, and template is designed to four, a type, takes the template layout of full symmetric, and correspondence is established four foundry goods die cavities 3; Sprue 4 belows are provided with the filter 5 of foam ceramic filter, and connect the cross gate 6 of four full symmetrics, then are communicated with foundry goods die cavity 3 via four sheet type ingates 7 respectively; The top end face of each foundry goods die cavity 3 in the distal side of relative foundry goods ingate import arranges two insulated feeders 8 and carries out feeding.
Place insulated feeder 8 before moulding on cope match plate circle shape pad, then carry out back-up sand, consolidation, molding, repair type, and carry out flow coat operation and surperficial burn out process; Then make 1#, two cores 1 of 2#, 2, and after carrying out dip-coating and skin drying, placement is standby.
2) mould assembly
Be lowered in order 2 1#, 2# core 1,2 in lower sand mold b, placing ceramic screen pack a slice in filter 5: after blowing off the floating sand in up and down sand mold a, b, hang and turn that upper sand mold carries out mould assembly and with to be cast after the tight case of bolt etc.
3) furnace charge melting
First configure furnace charge, the composition percentage by weight of furnace charge is: the pig iron 30%, foundry returns 30%, steel scrap 40%, then the furnace charge that configures is carried out Smelting of iron in order input medium-frequency induction furnace successively, smelting temperature is 1560 ℃, standing insulation 5～10 minutes, allow impurity in iron liquid is fully floating to come up, after covering with deslagging agent, slag is taken off outside stove, prevent that impurity is deposited in iron liquid.
4) spheroidization and inoculation that taps a blast furnace is processed
Comprising taps a blast furnace carries out spheroidising and two parts of twice inoculation of ferrosilicon inovulant.Wherein spheroidizing treatment technology by rush-in method is adopted in spheroidising, the nodulizer granularity is 3～25mm, the nodulizer addition is 1.5%, iron liquid tapping temperature is 1560 ℃, the amount of tapping a blast furnace is 2/3 of total amount for the first time, the reagentia time of nodulizer and iron liquid is 40～90 seconds, the ferrosilicon inovulant that adds the total amount 0.3% of tapping a blast furnace after question response finishes, and add remaining 1/3 iron liquid, stir afterwards the scum silica frost that scratches clean iron liquid surface, add again 0.3% ferrosilicon inovulant of iron liquid gross weight, and stir and skim, cover at last thermal-insulating covering agent and go to pour into a mould.Wherein the chemical component weight percentage of nodulizer is: Mg 6.75%, RE 2.35%, Si 44%, Ca 2.0% and Fe surplus; The chemical component weight percentage of ferrosilicon inovulant is: Si 74%, Ca 0.6%, Al 0.55% and Fe surplus, the granularity of ferrosilicon inovulant are 3～25mm.
5) cast
The pouring temperature of iron liquid is 1435 ℃.After iron liquid was poured into by cup, the filter through the foamed filter net had blocked the impurity in iron liquid, had reduced the possibility of foundry goods generation dreg defect.Iron liquid through after filter, has slowed down the flow velocity of iron liquid in addition, has alleviated the impulsive force of iron liquid to casting mold, thereby has reduced the possibility of sand washing; It is steady that iron liquid fills type, is conducive to reduce the secondary oxidation of iron liquid in casting mold, thereby reduce the appearance of dreg defect.Iron liquid flows into four cross gates 6 subsequently simultaneously, then flows into each foundry goods die cavity 3 by four sheet type ingates 7 respectively, reaches the steadily purpose of cast of rapid dispersion; Adopt sulphur oxygen inovulant to carry out current-following inoculation in casting process, the granularity of sulphur oxygen inovulant used is 0.1～1.0mm, the chemical component weight percentage of sulphur oxygen inovulant is Si 73.2%, Al 0.87%, Ca 0.96%, Ce1.76%, S 0.64%, O 0.52% and Fe surplus, and the percentage that addition accounts for iron liquid total amount is 0.10%: the chemical composition total amount percentage of final casting product is: C 3.67% Si2.75%, Mn 0.36%, P 0.045%, S 0.011%, RE 0.015%, Mg 0.054% and Fe surplus.
6) cooling unpacking
7) casting cleaning
8) quality inspection
The product of disqualified upon inspection is done to eliminate and is scrapped processing, and the qualified foundry goods certified products warehouse of entering is temporary.
After adopting casting method of the present invention, foundry goods gross weight 11.5kg, the heavy 6.5kg of dead head, product yield is 63.8%, to this type of than light casting, these data are comparatively desirable, can create certain economic benefit for company.
The material trademark of product is spheroidal graphite cast-iron QT400-15, the mechanical performance test result of product ontology: tensile strength 405～485MPa, yield strength 260～345MPa, percentage elongation 15.2～23.5%, hardness 143～176HBS; Cast product metallographic structure testing result is: nodularization rate 90%, ferrite 92%, carbides-free exist; The chemical composition testing result of product: C 3.67%, Si 2.75%, Mn 0.36%, P 0.045%, S 0.011%, RE 0.015%, Mg 0.054% and Fe surplus; Cast product through ultrasonic wave defects detection result without any casting flaw.Cast product satisfies client's technical conditions requirement fully.
The main technologic parameters of table 1 embodiment of the present invention
The main testing result of table 2 embodiment of the present invention
Claims (6)
1. the casting method of turbocharger case, its step comprise mulling, moulding, coremaking, mould assembly, furnace charge melting, tap a blast furnace nodularization and inoculation, cast, cooling, unpacking, casting cleaning and product quality inspection; It is characterized in that: template is designed to two～eight, a type, takes the template layout of full symmetric, and correspondence is established two～eight foundry goods die cavities; In casting technique, adopt several sheet type ingate distributing pouring technologies: the filter that is provided with foam ceramic filter after iron liquid enters from sprue through sprue below, flow into simultaneously the cross gate of some full symmetrics, enter the foundry goods die cavity via the sheet type ingate respectively afterwards, be full of die cavity; Pouring temperature is controlled at 1380～1460 ℃; The top end face of each foundry goods die cavity in the distal side of relative foundry goods ingate import arranges two insulated feeders and carries out feeding.
2. the casting method of turbocharger case as claimed in claim 1 is characterized in that: described furnace charge melting step comprises furnace charge configuration and melting, and the percentage by weight of furnace charge configuration is: the pig iron 20～50%, foundry returns 20～40%, steel scrap 10～60%; Adopt the medium-frequency induction furnace melting, 1460～1580 ℃ of smelting temperatures.
3. the casting method of turbocharger case as claimed in claim 1 is characterized in that: described tap a blast furnace nodularization and inoculation operation comprise that tap a blast furnace spheroidising and ferrosilicon inovulant breed two links for twice.
4. the casting method of turbocharger case as claimed in claim 3, it is characterized in that: the nodularization dosage that adds is 1.0～2.5% of the melting amount of tapping a blast furnace, the chemical component weight percentage of nodulizer is: Mg 5.0～7.5%, RE 1.0～4.0%, Si 35～48%, Ca 1.0～3.0% and Fe surplus, the granularity of nodulizer are 3～25mm.
5. the casting method of turbocharger case as claimed in claim 3, it is characterized in that: described inovulant breeds the ferrosilicon inovulant that adds iron liquid gross weight 0.2～0.5% after the nodularization of namely once tapping a blast furnace for twice, stir subsequently and skim and add iron liquid, and breed for the second time, the ferrosilicon inovulant with 0.2～0.5% is added to envelope and carries out the rabbling hoe slag; The granularity of ferrosilicon inovulant used is 3～25mm, and the chemical component weight percentage of ferrosilicon inovulant is Si 72～75%, Al 0.4～1.5%, Ca0.4～1.0% and Fe surplus.
6. the casting method of turbocharger case as claimed in claim 1, it is characterized in that: in described cast step, iron liquid will guarantee that the iron liquid casting temperature is at 1380～1460 ℃ after the inovulant inoculation; Adopt sulphur oxygen inovulant to carry out current-following inoculation in casting process, sulphur oxygen inovulant granularity used is 0.1～1.0mm, chemical component weight percentage is Si 70～76%, Al 0.75～1.25%, Ca0.75～1.25%, Ce 1.5～2.0%, S 0.5～0.8%, O 0.3～0.5% and Fe surplus, and the percentage by weight that addition accounts for iron liquid total amount is 0.05～0.2%; The chemical component weight percentage of last cast product is: C 3.2～3.8%, Si 2.0～3.0%, Mn≤0.45%, P≤0.07%, S≤0.03%, RE 0.01～0.04%, Mg 0.02～0.08% and Fe surplus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010184267 CN102259167B (en) | 2010-05-25 | 2010-05-25 | Method for casting turbocharger encloser casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010184267 CN102259167B (en) | 2010-05-25 | 2010-05-25 | Method for casting turbocharger encloser casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102259167A CN102259167A (en) | 2011-11-30 |
| CN102259167B true CN102259167B (en) | 2013-06-05 |
Family
ID=45006109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010184267 Active CN102259167B (en) | 2010-05-25 | 2010-05-25 | Method for casting turbocharger encloser casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102259167B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717032B (en) * | 2012-07-09 | 2014-01-15 | 江苏多为泵业股份有限公司 | Precision casting method for automobile turbocharger casing part |
| CN102876998B (en) * | 2012-09-29 | 2015-03-04 | 西峡县众德汽车部件有限公司 | Heat-resistant steel, turbocharger conjoined casing and preparation method of turbocharger conjoined casing |
| CN102912211A (en) * | 2012-11-08 | 2013-02-06 | 南车戚墅堰机车有限公司 | Smelting method for cylinder cover of marine diesel engine |
| CN103341594B (en) * | 2013-07-03 | 2016-08-17 | 河南星鹏铸件有限责任公司 | A kind of casting method of brake shell |
| CN104190876A (en) * | 2014-08-29 | 2014-12-10 | 无锡柯马机械有限公司 | Casting process for turbocharger compressor shell |
| CN104493095B (en) * | 2015-01-09 | 2018-07-06 | 宁波日星铸业有限公司 | The running gate system and its pouring procedure of thin-section casting |
| CN105583365A (en) * | 2015-12-30 | 2016-05-18 | 青岛博泰美联化工技术有限公司 | Evaporative pattern casting method for diesel engine casing |
| CN106111921B (en) * | 2016-08-31 | 2018-04-10 | 常州国茂鑫鳌机械有限公司 | Thin-walled flat-type gray iron casting anti-deformation process |
| CN106583663B (en) * | 2016-12-22 | 2018-12-07 | 常州中车汽车零部件有限公司 | A kind of turbine case casting method |
| CN108160934B (en) * | 2018-02-10 | 2023-10-24 | 东风本田汽车零部件有限公司 | Multi-piece casting process and casting mold for engine cam shaft |
| CN108311644B (en) * | 2018-03-20 | 2024-01-12 | 江苏吉鑫风能科技股份有限公司 | Casting mold and casting method of solid solution reinforced ferrite nodular cast iron wind power casting |
| CN108555244A (en) * | 2018-04-24 | 2018-09-21 | 上柴动力海安有限公司 | A kind of cast iron sand core manufacturing method |
| CN110238346A (en) * | 2019-07-18 | 2019-09-17 | 成都艾特安科技有限公司 | The method of green casting vehicle turbocharger shell |
| CN113118385A (en) * | 2019-12-31 | 2021-07-16 | 辽宁锦鸿数控机械制造有限公司 | Steel casting pouring device |
| CN113732246A (en) * | 2021-09-07 | 2021-12-03 | 襄阳云威机械有限公司 | Method for reducing deformation and sand adhesion of shell mold casting |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1477223A (en) * | 2002-07-24 | 2004-02-25 | ���η�ϣ��������������˾ | Cast-iron alloy |
| CN101585078A (en) * | 2008-05-23 | 2009-11-25 | 上海华新合金有限公司 | Method for casting as-cast high-tenacity cast iron bearing cover of locomotive |
-
2010
- 2010-05-25 CN CN 201010184267 patent/CN102259167B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1477223A (en) * | 2002-07-24 | 2004-02-25 | ���η�ϣ��������������˾ | Cast-iron alloy |
| CN101585078A (en) * | 2008-05-23 | 2009-11-25 | 上海华新合金有限公司 | Method for casting as-cast high-tenacity cast iron bearing cover of locomotive |
Non-Patent Citations (4)
| Title |
|---|
| 倪志全等.铁型覆砂无冒口铸造增压器涡轮壳.《铸造》.2006,第55卷(第9期), |
| 周锦银.汽车涡轮增压器壳体材料的现状和发展.《江苏冶金》.2006,第34卷(第5期),1-3. * |
| 铁型覆砂无冒口铸造增压器涡轮壳;倪志全等;《铸造》;20060930;第55卷(第9期);第956页左栏第2段至958页左栏第2段，图1 * |
| 魏兵等.发热保温冒口在铸件补缩工艺上的应用.《铸造技术》.2008,第29卷(第7期),971-974. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102259167A (en) | 2011-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102259167B (en) | Method for casting turbocharger encloser casting | |
| CN101716651B (en) | Method for casting turbo supercharger volute shell casting for large ship | |
| CN108531803B (en) | A kind of casting method of spheroidal graphite cast-iron valve body | |
| CN102019353B (en) | Precision casting molding method for complex thin-walled member | |
| CN107245640B (en) | A kind of preparation method and running gate system of wind-powered electricity generation taper spindle | |
| CN100343404C (en) | Sulfuric acid corrosion resistant alloy nodular cast iron materials | |
| CN103820704B (en) | Form in High Nickel Austenite Nodular Cast Iron material of vehicle turbine housing and preparation method thereof | |
| CN102371345B (en) | Method for casting ductile iron casting of air-conditioning compressor | |
| CN110695311B (en) | Casting process of gearbox shell | |
| CN102078956B (en) | Method for casting mechanical arm casting of robot | |
| CN101585078A (en) | Method for casting as-cast high-tenacity cast iron bearing cover of locomotive | |
| CN201711492U (en) | Mold for nuclear H4 valve | |
| CN102310187B (en) | Elevator traction sheave casting method | |
| CN104195448B (en) | Casting alloy material and the technique casting ocean platform canine tooth roller box foundry goods with it | |
| CN101628323A (en) | Casting process of nodular cast iron planet carrier | |
| CN104439124A (en) | Method for restraining macrosegregation of large steel ingot | |
| CN103084542A (en) | Process for casting heat-resistant steel or wear-resistant alloy steel by evaporative pattern casting (EPC) | |
| CN110238346A (en) | The method of green casting vehicle turbocharger shell | |
| CN104174819A (en) | Casting technology for three-stage planetary frame of ocean platform climbing machine | |
| CN106424571B (en) | The cavity structure of the middle case of wind power generating set, the method for preparing middle case using the structure | |
| CN104174820B (en) | A kind of ocean platform climbs the casting technique of machine secondary planet frame | |
| CN106521297B (en) | A kind of method for reducing Form in High Nickel Austenite Nodular Cast Iron turbine case internal flaw | |
| CN107321926B (en) | Casting system for injection molding machine type template casting and casting method using same | |
| CN101927499B (en) | Method for making robot base casting | |
| CN101962732A (en) | Austenite nodular cast iron diffuser and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |