CN104353789B - The preparation method of a kind of sand casting core and prepared core - Google Patents
The preparation method of a kind of sand casting core and prepared core Download PDFInfo
- Publication number
- CN104353789B CN104353789B CN201410573375.7A CN201410573375A CN104353789B CN 104353789 B CN104353789 B CN 104353789B CN 201410573375 A CN201410573375 A CN 201410573375A CN 104353789 B CN104353789 B CN 104353789B
- Authority
- CN
- China
- Prior art keywords
- sand
- molding sand
- core
- preparation
- phenol resin
- 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
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses the preparation method of a kind of sand casting core and prepared core. This preparation method includes: 1. fill up molding sand A in the white space that core box and core are constituted, to form arenaceous shell; 2., when molding sand A is not fully cured, in the region of core, fills up molding sand B, strike off; 3. core is taken out after being fully cured; Molding sand A includes: the cast steel silica sand of 40��100 orders, accounts for the alkalescent phenol resin of silica sand quality 2��2.5% and accounts for the organic ester curing agent of alkalescent phenol resin quality 20��25%; Molding sand B includes: base material X, alkalescent phenol resin and organic ester curing agent; The content of alkalescent phenol resin is 2��2.5% of the quality with the isopyknic silica sand of base material X, and the content of organic ester curing agent is the 20��25% of alkalescent phenol resin. Core deformability provided by the invention is good, and technique is simple, is suitable for large-scale industrial production.
Description
Technical field
The present invention relates to the preparation method of a kind of sand casting core and prepared core.
Background technology
As depicted in figs. 1 and 2, sand casting is to use binding agent by refractory material sand grains stick hardened forming, forms the die cavity 4 corresponding with cast product, is poured in die cavity 4 by liquid metal by cast gate 5, is foundry goods after liquid metal solidification. If foundry goods is hollow-core construction, corresponding core 2 is then used to realize, core 2 is embedded between the mo(u)ld top half 1 and mo(u)ld bottom half 3 being superimposed with each other, to realize the fixing of self and location, say, that the bore channels of the foundry goods of required hollow-core construction uses core to realize.
But, metal casting is before the forming, the molten metal of liquid is in the process of solidification cooling, can produce to shrink, core then hinders the contraction of foundry goods, when casting dimension is relatively big or wall thickness is relatively thin, foundry goods will form crackle because the resistance of core is excessive, and the crack problem of this foundry goods is casting industry insoluble technical problem all the time. For heavy caliber, thin-wall part, low pump stage, high alloy content Valve Steel Castings cast article, inner chamber and the zone crack such as flange root, valve seat periphery almost cannot be avoided, the factor impacts such as the thermal stress that main cause is Mechanical stress and casting structure causes, cause reprocess, learies very high.
Summary of the invention
It is poor that the technical problem to be solved is in that to overcome in prior art the deformability of core, and foundry goods is easily generated the defect of crackle, and provides the preparation method of a kind of sand casting core and prepared core. Core deformability provided by the invention is good, no longer because foundry goods wall is thin, geometry size is big, shrink total amount and produce penetrating crack or dispersibility intensity crackle greatly, even local crackle is also little, valve, pump case foundry goods are scrapped minimizing because of what crackle produced or no longer occur, foundry goods because of crackle reprocess, polish, soldering, film making expense reduce, manufacturing cost declines; And the preparation technology of core is simple, is suitable for large-scale industrial production.
The preparation method that the invention provides a kind of sand casting core, it comprises the steps:
(1) in the white space that core box and core are constituted, molding sand A is filled up, to form arenaceous shell;
(2) when molding sand A is not fully cured, in the region of core, fill up molding sand B, strike off simultaneously;
(3) core is taken out after being fully cured;
Wherein, described molding sand A includes following component: the cast steel silica sand of 40��100 orders, alkalescent phenol resin and organic ester curing agent; Wherein, the content of alkalescent phenol resin is the 2��2.5% of the quality of the cast steel silica sand of 40��100 orders, and the content of organic ester curing agent is the 20��25% of the quality of molding sand A neutral and alkali phenolic resin;
Described molding sand B includes following component: base material X, alkalescent phenol resin and organic ester curing agent; The content of alkalescent phenol resin is 2��2.5% of the quality with the described isopyknic silica sand of base material X, and the content of organic ester curing agent is the 20��25% of the quality of molding sand B neutral and alkali phenolic resin; Described base material X includes expanded perlite and the cast steel silica sand with 40��100 orders, and wherein expanded perlite and cast steel are (3:7)��(1:1) by the volume ratio of the silica sand of 40��100 orders.
In the present invention, the preparation method of described molding sand A is preferably: take the cast steel silica sand with 40��100 orders, is added thereto to account for the alkalescent phenol resin of the quality 2��2.5% of silica sand, adds the organic ester curing agent of the quality 20��25% accounting for alkalescent phenol resin, mix homogeneously.
In the present invention, the preparation method of described molding sand B is preferably: take base material X, be added thereto to account for quality with the described isopyknic silica sand of base material X 2��2.5% alkalescent phenol resin, add the organic ester curing agent of the quality 20��25% accounting for alkalescent phenol resin, mix homogeneously.
Wherein, in described molding sand B, expanded perlite and the cast steel volume ratio of the silica sand of 40��100 orders are preferably 4:6; And/or, the content of organic ester curing agent is preferably the 20% of the quality of alkalescent phenol resin.
In the present invention, in described molding sand B, described expanded perlite is the expanded perlite that this area is conventional, and it is mainly composed of: the SiO of more than 70%2, more than 10% Al2O3And a small amount of TiO2��Fe2O3And MgO, described percentage ratio is mass percent. In described molding sand B, the particle diameter of described expanded perlite is preferably 10-20 order, is more preferably 20 orders.
In the present invention, described silica sand can be conventionally used for the silica sand of cast steel for this area, it is preferred that for washed-out sand and/or scouring sand. Those skilled in the art all understand: described washed-out sand is Foundry sand, natural silica Sand obtain after washing and staged care, its clay content (mass percent)��1.0%.Described scouring sand is a kind of Foundry sand, is that natural silica Sand obtains after scouring, washing, classification and drying, its clay content (mass percent) < 0.5%.
In the present invention, described silica sand is preferably comprised the SiO of more than 96%2, described percentage ratio is the mass percent accounting for silica sand.
In the present invention, the granule of described silica sand is preferably 40-70 or 50-100 order.
In the present invention, described silica sand reuses after can separating, reclaim and regenerating, and described regeneration is generally the dust and surface tree adipose membrane that remove silica sand powder; The regeneration rate of described silica sand is generally 95%��97%, and described percentage ratio is mass percent. The described silica sand in molding sand B is preferably reclaimed sand.
Present invention also offers the core prepared by above-mentioned preparation method.
Meeting on the basis of this area general knowledge, above-mentioned each optimum condition, can combination in any, obtain the preferred embodiments of the invention.
Agents useful for same of the present invention and raw material are all commercially.
The actively progressive effect of the present invention is in that:
Core deformability provided by the invention is good, no longer because foundry goods wall is thin, geometry size is big, shrink total amount and produce penetrating crack or dispersibility intensity crackle greatly, even local crackle is also little, valve, pump case foundry goods are scrapped minimizing because of what crackle produced or no longer occur, foundry goods because of crackle reprocess, polish, soldering, film making expense reduce, manufacturing cost declines; And the preparation technology of core is simple, is suitable for large-scale industrial production.
Accompanying drawing explanation
Fig. 1 is the structural representation of sand mold.
Fig. 2 is the sand mold generalized section along A-A face of Fig. 1.
Fig. 3 is the structural representation of the core of embodiment 1.
Fig. 4 is 16 cun of 300 pounds of level thin-section castings that the core that embodiment 1 prepares prepares.
Fig. 5 is 20 cun of 150 pounds of valve body thin-section castings that the core that comparative example 1 prepares prepares.
Detailed description of the invention
Mode by the examples below further illustrates the present invention, but does not therefore limit the present invention among described scope of embodiments. The experimental technique of unreceipted actual conditions in the following example, conventionally and condition, or selects according to catalogue.
In following embodiment, the preparation method of molding sand A is: take the cast steel silica sand with 40��100 orders, adds alkalescent phenol resin, adds organic ester curing agent, mix homogeneously.
In following embodiment, the preparation method of molding sand B is: takes base material X, base material X and includes the silica sand of expanded perlite, cast steel 40��100 orders, adds alkalescent phenol resin, adds organic ester curing agent, mix homogeneously.
In following embodiment, the purchase producer of raw material and model are as shown in table 1.
The purchase producer of table 1 embodiment Raw and model
| Kind | Buy producer and model |
| Expanded perlite | Hong Hao industrial furnace company limited of Danyang City (20 order) |
| The cast steel silica sand of 40-100 order | High-purity stone powder factory of Zhangjagang City (40-70 order) |
| Alkalescent phenol resin | Suzhou Xingye Material Technology Co., Ltd. |
| Organic ester curing agent | Suzhou Xingye Material Technology Co., Ltd. |
Embodiment 1
In the present embodiment, the raw material of molding sand A includes the cast steel silica sand of 40��100 orders, alkalescent phenol resin and organic ester curing agent, and concrete proportioning is as shown in table 2:
The proportioning raw materials of the molding sand A of table 2 embodiment 1
| Kind | Content |
| Alkalescent phenol resin (accounts for the mass percent of silica sand) | 2.0% |
| Organic ester curing agent (accounts for the mass percent of alkalescent phenol resin) | 20% |
In the present embodiment, molding sand B includes following component: base material X, alkalescent phenol resin and organic ester curing agent;This base material X includes expanded perlite (particle diameter 20 order), the silica sand of cast steel 40��100 orders (includes the SiO of more than 96%2, mass percent), this expanded perlite and cast steel are 4:6 by the percent by volume of the silica sand of 40��100 orders; The content of this alkalescent phenol resin is the 2.3% of the quality of the silica sand with base material X equal volume, and the content of this organic ester curing agent is the 20% of the quality of this alkalescent phenol resin.
Core is prepared, as it is shown on figure 3, the preparation method of core 2 comprises the steps: with the molding sand B of preparation and molding sand A
(1) in the white space that core box 7 and core 2 are constituted, molding sand A is filled up, to form arenaceous shell 6;
(2) when molding sand A is not fully cured, in the region of core 2, fill up molding sand B, strike off simultaneously;
(3) core 2 is taken out after being fully cured.
When this core is used for the thin-section casting producing 16 cun of 300 pounds of levels, it has been found that thin-section casting does not have crackle to produce, as shown in Figure 4.
Embodiment 2
In the present embodiment, molding sand A, molding sand B, core preparation method all with embodiment 1, be different in that:
The raw material of molding sand A includes the cast steel silica sand of 40��100 orders, alkalescent phenol resin and organic ester curing agent, and concrete proportioning is as shown in table 3:
The proportioning raw materials of the molding sand A of table 3 embodiment 2
| Kind | Content |
| Alkalescent phenol resin (accounts for the mass percent of silica sand) | 2.5% |
| Organic ester curing agent (accounts for the mass percent of alkalescent phenol resin) | 25% |
Molding sand B includes following component: base material X, alkalescent phenol resin and organic ester curing agent; This base material X includes expanded perlite (particle diameter 20 order), the silica sand of cast steel 40��100 orders (includes the SiO of more than 96%2, mass percent), this expanded perlite and cast steel are 4.5:5.5 by the percent by volume of the silica sand of 40��100 orders; The content of this alkalescent phenol resin is the 2.5% of the quality of the silica sand with base material X equal volume, and the content of this organic ester curing agent is the 25% of the quality of this alkalescent phenol resin.
Embodiment 3
In the present embodiment, molding sand A, molding sand B, core preparation method with embodiment 1, be different in that:
Molding sand B includes following component: base material X, alkalescent phenol resin and organic ester curing agent; This base material X includes expanded perlite (particle diameter 20 order), the silica sand of cast steel 40��100 orders (includes the SiO of more than 96%2, mass percent), this expanded perlite and cast steel are 3:7 by the percent by volume of the silica sand of 40��100 orders; The content of this alkalescent phenol resin is the 2.1% of the quality of the silica sand with base material X equal volume, and the content of this organic ester curing agent is the 22% of the quality of this alkalescent phenol resin.
Comparative example 1
In this comparative example, molding sand A, core preparation method all with embodiment 1, be different in that: the molding sand A prepared by embodiment 1 replaces molding sand B, and namely single use molding sand A prepares core.
The core that molding sand A prepared by this comparative example makes produces 20 cun of 150 pounds of valve body thin-section castings, it has been found that occurs in that Multiple site crack on thin-section casting, (represents with black surround in figure) as shown in Figure 5.
Effect example 1
This effect example is the comprcssive strength utilizing sand mold strength tester to measure core, and with the deformability that this characterizes core, result is as shown in table 4.
The deformability results contrast of table 4 core
| Project | Comprcssive strength (MPa) | Deformability |
| The core that embodiment 1 prepares | Less than 0.75 | Good |
| The core that comparative example 1 prepares | 1.5 | Difference |
Claims (10)
1. the preparation method of a sand casting core, it is characterised in that it comprises the steps:
(1) in the white space that core box and core are constituted, molding sand A is filled up, to form arenaceous shell;
(2) when molding sand A is not fully cured, in the region of core, fill up molding sand B, strike off simultaneously;
(3) core is taken out after being fully cured;
Wherein, described molding sand A includes following component: the cast steel silica sand of 40��100 orders, alkalescent phenol resin and organic ester curing agent; Wherein, the content of alkalescent phenol resin is the 2��2.5% of the quality of the cast steel silica sand of 40��100 orders, and the content of organic ester curing agent is the 20��25% of the quality of molding sand A neutral and alkali phenolic resin;
Described molding sand B includes following component: base material X, alkalescent phenol resin and organic ester curing agent; The content of alkalescent phenol resin is 2��2.5% of the quality with the described isopyknic silica sand of base material X, and the content of organic ester curing agent is the 20��25% of the quality of molding sand B neutral and alkali phenolic resin; Described base material X includes expanded perlite and the cast steel silica sand with 40��100 orders, and wherein expanded perlite and cast steel are (3:7)��(1:1) by the volume ratio of the silica sand of 40��100 orders.
2. preparation method as claimed in claim 1, it is characterized in that, the preparation method of described molding sand A is: take the cast steel silica sand with 40��100 orders, it is added thereto to account for the alkalescent phenol resin of the quality 2��2.5% of silica sand, add the organic ester curing agent of the quality 20��25% accounting for alkalescent phenol resin, mix homogeneously.
3. preparation method as claimed in claim 1, it is characterized in that, the preparation method of described molding sand B is: take described base material X, be added thereto to account for quality with the described isopyknic silica sand of base material X 2��2.5% alkalescent phenol resin, add the organic ester curing agent of the quality 20��25% accounting for alkalescent phenol resin, mix homogeneously.
4. preparation method as claimed in claim 1, it is characterised in that in described molding sand B, expanded perlite and cast steel are 4:6 by the volume ratio of the silica sand of 40��100 orders; And/or, in described molding sand B, the content of organic ester curing agent is the 20% of the quality of alkalescent phenol resin.
5. preparation method as claimed in claim 1, it is characterised in that in described molding sand B, the particle diameter of described expanded perlite is 10-20 order.
6. preparation method as claimed in claim 5, it is characterised in that in described molding sand B, the particle diameter of described expanded perlite is 20 orders.
7. preparation method as claimed in claim 1, it is characterised in that described molding sand A and/or in described molding sand B, described silica sand is washed-out sand and/or cleans sand.
8. preparation method as claimed in claim 1, it is characterised in that described molding sand A and/or in described molding sand B, described silica sand includes the SiO of more than 96%2, described percentage ratio is the mass percent accounting for silica sand.
9. preparation method as claimed in claim 1, it is characterised in that described molding sand A and/or in described molding sand B, the granule of described silica sand is 40-70 or 50-100 order; And/or, the described silica sand in molding sand B is reclaimed sand.
10. the core that the preparation method as described in any one of claim 1��9 prepares.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410573375.7A CN104353789B (en) | 2014-10-23 | 2014-10-23 | The preparation method of a kind of sand casting core and prepared core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410573375.7A CN104353789B (en) | 2014-10-23 | 2014-10-23 | The preparation method of a kind of sand casting core and prepared core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104353789A CN104353789A (en) | 2015-02-18 |
| CN104353789B true CN104353789B (en) | 2016-06-08 |
Family
ID=52521147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410573375.7A Active CN104353789B (en) | 2014-10-23 | 2014-10-23 | The preparation method of a kind of sand casting core and prepared core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104353789B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105328113A (en) * | 2015-11-02 | 2016-02-17 | 沈阳金安铸造材料有限公司 | Pre-coated sand used for casting and production method of pre-coated sand |
| CN105478668A (en) * | 2015-12-27 | 2016-04-13 | 无锡市灵通铸造有限公司 | Novel sand mold |
| CN107127291A (en) * | 2017-04-01 | 2017-09-05 | 东风精密铸造安徽有限公司 | A kind of water-glass sand core formula of moltening mold castings |
| CN107598099B (en) * | 2017-09-21 | 2024-04-12 | 宁波市平熔金属制品有限公司 | Mold core of casting mold for hollow cast steel thin-wall bent pipe with flanges at two ends |
| CN108296422B (en) * | 2017-10-27 | 2020-01-10 | 柳州市柳晶科技股份有限公司 | 3D printing precoated sand prepared from plateau red clay |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101628319A (en) * | 2008-07-14 | 2010-01-20 | 中国北车集团大同电力机车有限责任公司 | Production method of double-sand mold of resin sand |
| CN102303095A (en) * | 2011-09-22 | 2012-01-04 | 湖州中联机械制造有限公司 | Casting core for forming L-shaped rectangular hole |
| CN102941311A (en) * | 2012-11-14 | 2013-02-27 | 顾开明 | Processing method of moulding sand |
| CN103331408A (en) * | 2013-07-05 | 2013-10-02 | 亚新铸造（苏州）有限公司 | Resin sand used for steel casting and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2802384B2 (en) * | 1988-09-20 | 1998-09-24 | マツダ株式会社 | Core for casting |
| US20120199309A1 (en) * | 2011-02-04 | 2012-08-09 | Ask Chemicals L.P. | Sand additives for molds/cores for metal casting |
-
2014
- 2014-10-23 CN CN201410573375.7A patent/CN104353789B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101628319A (en) * | 2008-07-14 | 2010-01-20 | 中国北车集团大同电力机车有限责任公司 | Production method of double-sand mold of resin sand |
| CN102303095A (en) * | 2011-09-22 | 2012-01-04 | 湖州中联机械制造有限公司 | Casting core for forming L-shaped rectangular hole |
| CN102941311A (en) * | 2012-11-14 | 2013-02-27 | 顾开明 | Processing method of moulding sand |
| CN103331408A (en) * | 2013-07-05 | 2013-10-02 | 亚新铸造（苏州）有限公司 | Resin sand used for steel casting and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 大型复杂薄壁铝合金铸件的复合型铸造;钱福江;《特种铸造及有色合金》;20010430(第02期);105-106 * |
| 酯硬化酚醛树脂砂铸造工艺性能;梁金茹，闵雪涛，郝敬禄，马群;《热加工工艺》;19961130(第06期);42-43 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104353789A (en) | 2015-02-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104353789B (en) | The preparation method of a kind of sand casting core and prepared core | |
| CN101530892B (en) | Investment casting thin-walled part casting method | |
| CN103357470A (en) | Wear-resistant hammer head of hammer crusher and preparation method thereof | |
| CN105834351A (en) | High-temperature resistant casting mold material | |
| CN103667876A (en) | Multi-metal composite wear-resistant elbow pipe and preparation method thereof | |
| CN104972063A (en) | Method for manufacturing wax mould for precision investment casting | |
| US20020165292A1 (en) | Casting sand cores and expansion control methods therefor | |
| CN103949578B (en) | Cylinder cover of automobile engine and preparation method thereof | |
| CN106513565A (en) | Foundry molding sand | |
| CN112605338A (en) | Method for producing mounting seat steel casting based on precoated sand shell mold process | |
| CN102861865A (en) | Molding sand proportioning technology for producing large supercritical casting steel | |
| CN101954458A (en) | Method for manufacturing crushing wall or rolling mortar wall pouring system of cone crusher during sand-coated casting of inner/outer metal molds | |
| CN103056284B (en) | The application of clay holomorphosis sand modifier, method of modifying and modifier | |
| CN103433428B (en) | A kind of composite casting method | |
| Weise et al. | New core technology for light metal casting | |
| CN102274929B (en) | Method for preventing lost foam casting product from crushing | |
| CN203917854U (en) | A kind of vertical centrifugal casting device for the preparation of Concentric Reducers | |
| CN103521411B (en) | Method for brushing coatings on sand mould cores of hydrogenation valve carbon steel castings | |
| CN101985158B (en) | Method for casting manganese steel broken wall or mortar-rolling wall of cone crusher by internal and external metal molds sand-lining | |
| CN109175217B (en) | Casting glass sand and preparation method thereof | |
| CN102059336A (en) | Method for casting material, casting mould for implementing the method and objects manufactured in accordance with the method | |
| CN1050999A (en) | Do not process feed trumpet | |
| CN105855517A (en) | Production method of wear-resisting castings | |
| CN110565005A (en) | Production process method of low-temperature ductile iron casting | |
| CN108057852A (en) | A kind of preparation process for buffering tank shell |
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 |