CN106807888A - A kind of resin-coated sand shell mould covers the casting technique of steel sand solidification - Google Patents
A kind of resin-coated sand shell mould covers the casting technique of steel sand solidification Download PDFInfo
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- CN106807888A CN106807888A CN201710003141.2A CN201710003141A CN106807888A CN 106807888 A CN106807888 A CN 106807888A CN 201710003141 A CN201710003141 A CN 201710003141A CN 106807888 A CN106807888 A CN 106807888A
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- sand
- casting
- steel
- solidification
- shell mould
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The casting technique of steel sand solidification is covered the invention belongs to casting field, more particularly to a kind of resin-coated sand shell mould.Casting technique includes the technologies such as Modeling Material preparation, moulding, coremaking, Metal Melting, cast and solidification control, it is contemplated that moulding and solidification control aspect make innovation, with the cast structure better than conventional production.It is characterized in that：The formative technology uses two kinds of Material cladding moulding, including facing sand and floor sand, and the facing sand is two kinds of materials of different thermal conductivity factors with floor sand.The present invention is used from precoated sand as facing sand, has saved precoated sand consumption, improves surface quality of continuous castings；Floor sand uses steel sand, reduces regenerating used expense, it is often more important that steel sand reduces casting modulus as a kind of profile-followed chill indirectly, reduces casting defect；The Modeling Material of two kinds of different thermal conductivity factors coordinates, and controls cooling velocity to obtain uniform cast structure.The technique productions flexibility is big, applicability is good, low cost.
Description
Technical field
The casting technique of steel sand solidification is covered the invention belongs to casting field, more particularly to a kind of resin-coated sand shell mould.
Background technology
Casting technique is exactly the technology and method for producing casting about theoretical and systematic knowledge using casting.Including Modeling Materials
Material preparation, moulding, coremaking, Metal Melting, cast and solidification control etc..The performance of casting is decided by its interior tissue, casting
Tissue be to be determined by casting technique, it is the pass that produces casting to obtain set tissue by the control to casting solidification process
Key link.For the casting of certain chemical composition and planform, the cooling capacity of casting mold is to carry out solidification control to obtain both
The key factor of fixed tissue.Different mold materials has the different capacity of heat transmission, cause the different cooling velocity of casting so as to
Obtain different cast structures.From for the capacity of heat transmission, dry sand mold ＜ greensand mold ＜ metal molds.For dry sand mold often by
In its cooling velocity is slow and coarse grains, performance reduction；And metal mold has thermal conductivity and recovery electric heating system high, casting is accelerated
When cooling, energy crystal grain thinning raising mechanical property, but cooling velocity are too fast the tissue defects such as spoken parts in traditional operas are easily caused at thin-walled；For
Greensand mold, mo(U)ld face moisture evaporation and migration rapidly after cast, cast product surface layer cooling velocity is exceedingly fast and easily forms over-cooling structure,
Rise casting cooling velocity rapidly with type temperature to slow down until reach thermal balance, gradually cooled down with type afterwards, thus casting is interior
Outer tissue is uneven.Above formative method, for requiring the product of body sampling often because of tissue existing defects or tissue
It is uneven and mechanical property does not reach requirement.Emerging a kind of Sand-Faced Metal Mould Casting technique at present, the casting mold capacity of heat transmission is than dry
Sand mold is big smaller than metal mold, is a kind of more satisfactory heat conduction sand mold, and its deformability is small can be avoided and reduce shrinkage porosite.But swage
Cover sand gas permeability it is bad, can only the type of a mould one, investment is big, floor space is big, the rebating cycle is long, high cost, be unsuitable for batch it is small,
Wide in variety, fast product of retrofiting, the scope of application is narrower.
The content of the invention
The present invention is directed to above-mentioned problem, proposes that a kind of resin-coated sand shell mould covers the casting technique of steel sand solidification.
In order to achieve the above object, the technical solution adopted by the present invention is, there is provided a kind of resin-coated sand shell mould covers steel sand solidification
Casting technique, it is intended to moulding and solidification control aspect make innovation, it is characterised in that：The formative technology uses two kinds of materials
Complex modeling, including facing sand and floor sand, the facing sand and floor sand are two kinds of materials of different thermal conductivity factors.
Preferably, the facing sand is precoated sand, the floor sand is steel sand, using steel sandbox, facing sand and sandbox it
Between tamp sizing with steel sand.
Preferably, the precoated sand is shell mould, shell mould thickness is 6~30mm；1~2.5mm of the steel sand granularity, shape
Coefficient is not more than 20%, degree of purity more than 90% less than 0.8；Steel sand thickness is more than 1 times of casting section thickness.
It is a kind of dry sand mold as the overlay film sand mold of facing sand, thermal conductivity factor is relatively low, top layer solidification degree of supercooling is smaller, it is to avoid
Bad (such as D types of ironcasting or E types graphite, Quench ferrite) is organized caused by greensand mold cast product surface layer degree of supercooling is big；
Used as the steel sand of floor sand, thermal conductivity factor is larger, absorbs and delivers the heat of overlay film sand mold in time, reduces overlay film sand mold temperature,
The cooling velocity of casting is accelerated, casting solidification process is shortened.The technology characteristics homogenize cast structure, crystal grain refinement,
Improve the mechanical property of casting.Can also be by precoated sand and the cooling velocity of the design adjustment casting of steel sand thickness：Consider
Chill to steel sand is acted on, and resin-coated sand shell mould thickness (forming the region of cast(ing) surface) is designed as 6~30mm；Steel sand thickness is designed
It is more than 2 times of casting modulus.Furthermore, it is contemplated that the mobility and practicality of steel sand, steel sand granularity is designed as 1~2.5mm, shape
Shape coefficient is not more than 20%, degree of purity more than 90% less than 0.8；In view of mold stiffness, using steel sandbox, steel sand and steel
Matter sandbox can fix sand mold, prevent type wall from migrating, reduces shrinkage defect.
Compared with the above conventional casting methods, by the improvement to casting cooler environment, tissue is obtained relatively equal
Even casting；Compared with Iron Mould Coated Sand：Mould permeability is good, be not required to the type of a mould one, mould can continuously repeat use, steel sand can follow
Ring is utilized, low cost, it is adaptable to most of medium and small foundry enterprises.
Compared with prior art, advantages and positive effects of the present invention are,
1st, cast structure of the present invention homogenization, process improving degree of irregularity of the casting with type cooling velocity, makes casting
Part microstructure homogenization, crystal grain refinement, improve the mechanical property of casting.
2nd, casting dimension accuracy is good, and overlay film sand mold intensity is high, clear-cut, and surface roughness reaches Ra6.3~12.5 μm, chi
Very little precision reaches CT7~CT9 grades.
3rd, sand holes ratio of defects is low, and compared with clay greensand mold, casting mold inner surface is all overlay film sand mold, and surface strength is high, sand
Eye ratio of defects is low.
4th, vapour lock class defect is reduced, compared with metal mold, Iron Mould Coated Sand technique, with good gas permeability, the row of reducing
The bad vapour lock class casting defect for causing of gas, such as misrun, cold shut, blowhole.
5th, shrinkage defect is reduced, on the one hand, compared with clay greensand mold：Sand mold intensity is high, rigidity is big, deformability is small, energy
Surface buckle caused by the expansion of G. Iron Castings Graphite Precipitation is effective against, internal porosity defect is reduced；On the other hand, as floor sand
Steel sand is substantially a kind of indirect chill of profile-followed arrangement, using it cold-working can be helped to reduce shrink defects.
6th, low production cost, the casting yield more than 95% of the technique productions, compared with Iron Mould Coated Sand technique, product effect
Fruit is approximate but cost is relatively low.
7th, applicability is good, on the one hand, steel sand is used as a kind of indirect chill of profile-followed arrangement, it is adaptable to various complicated shape tables
Helping for face is cold；On the other hand, its convenient and flexible operation, it is adaptable to most of medium and small foundry enterprises.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will use needed for embodiment description
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are some embodiments of the present invention, for ability
For the those of ordinary skill of domain, without having to pay creative labor, can also obtain other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is that the resin-coated sand shell mould that embodiment 1 is provided covers steel sand solidification moulding schematic diagram；
Fig. 2 is that the resin-coated sand shell mould that embodiment 1 is provided covers steel sand solidification casting mold schematic diagram；
Fig. 3 is that the resin-coated sand shell mould that embodiment 1 is provided covers steel sand solidification sandbox schematic diagram；
Fig. 4 is that the resin-coated sand shell mould that embodiment 1 is provided covers steel sand solidification casting mold and sandbox cooperation schematic diagram；
Specific embodiment
In order to be more clearly understood that the above objects, features and advantages of the present invention, with reference to the accompanying drawings and examples
The present invention will be further described.It should be noted that in the case where not conflicting, in embodiments herein and embodiment
Feature can be mutually combined.
Many details are elaborated in the following description in order to fully understand the present invention, but, the present invention may be used also
To be implemented using other modes described here are different from, therefore, the present invention is not limited to the specific of specification described below
The limitation of embodiment.
Embodiment 1
Inventor illustrates and covers steel sand using resin-coated sand shell mould by taking a kind of production method of bearing adjusters casting as an example
The beneficial effect of the casting technique of solidification.
The material of casting is D5506, the tensile strength Rm >=550MPa of body sampling, elongation percentage A >=6%；Hardness 217-
255HB.With SAE J434 Standards D5506 (Rm >=552MPa, A >=6%；Hardness 187-255HB) compare：Lowest hardness is carried
High about 16%, relation combination inventor's knowhow of hardness and tensile strength according to spheroidal graphite cast-iron, through studying the casting
Following requirements need to be met：Body Rm >=650MPa, A >=6%.Because hardness range is reduced into 38HB from 68HB, so to casting
Cooling procedure need to effectively and stably be controlled.Because body sampling is influenceed by casting structure, non-homogeneous degree is big,
Consistency is good not as good as reference block, and experiment disqualification rate is high under conditions of same material, so the castings production of this example has one
Determine difficulty.Similar casting (phase same material, similar shape) shows in the knowhow of DISA lines, meets intensity, hardness requirement
Under the premise of, elongation percentage is about between 4%~6%.Table 1 is production result of the similar products in DISA lines：
Table 1 is similar to casting trial result
Production result shows：In the case of ensureing that hardness is qualified and being, tensile strength is higher, elongation percentage is relatively low.DISA line works
Skill can not fully meet the technical requirements of product.
Therefore, inventor takes the casting technique that resin-coated sand shell mould covers steel sand solidification to be cast.First according to casting shape
Shape, research parting, type scheme processed, in order that aiding in casting to cool down with steel sand controls its process of setting, cast design is shell mould, such as
Shown in Fig. 2, according to casting section thickness situation and operability is considered, to forming the shell mould thickness in cast(ing) surface area in addition to muscle portion is strengthened
It is designed as 8~20mm.Next to that the design of sandbox 2, as shown in figure 3, according to casting section thickness situation and operability, design is minimum
Steel sand amount is eaten for 30mm, according to sand mold appearance and size, design sandbox inside dimension is 450mm × 380mm × 240mm.
As shown in Figure 1 and Figure 4, be ready to match with moulding number before moulding and check qualified resin-coated sand shell mould 1 and
Sandbox 2, steel sand 3, between 1~2.5mm, degree of purity more than 90%, sandbox 2 selects steel sandbox to the granularity of steel sand 3.Secondly will
Sandbox 2 is laid flat in posed positions, and level is answered in the bottom surface of sandbox 2 during no particular/special requirement.Then the cast gate of resin-coated sand shell mould 1 is put down upwards
It is placed on the steel sand face paved, resin-coated sand shell mould 1 is pinned downwards and is reciprocated for several times around, meets case week mold thickness
It is required that, tamping bottom steel sand 3, cover tightly cast gate.Insert steel sand 3 and consolidate, notice that sand face is highly less than cast gate plane.Strike off
Mouthful, moulding is completed.Careful removing pours lid before cast, prevents sand grains from falling into casting mold.Pouring temperature is general to cast than clay green-sand
Low 40 DEG C or so of type, is beneficial to raising mechanical castings.Alignment cast gate is by the principle of " slow-fast-slow " in the time for specifying
Full casting mold is inside poured, casting process can not stop, the knockout in 700 DEG C~510 DEG C of casting temperature, it is considered to be cooled to during casting deformation
Black knockout.Sieve method is used after the completion of knockout, meticulous steel sand 3, old sand and dust is filtered, steel sand granularity is met and degree of purity will
Ask, in case next time uses.
It is that continuous three days inventors gather to creation data in table 2：
The bearing adjusters mechanical castings of table 2
Data above shows that the bearing adjusters casting of the method production fullys meet it and requires standard.Because,
After cast structure homogenization, it is ensured that the structural homogenity of body coupon, tensile strength and elongation percentage are improve.
The above, is only presently preferred embodiments of the present invention, is not the limitation for making other forms to the present invention, is appointed
What those skilled in the art changed possibly also with the technology contents of the disclosure above or be modified as equivalent variations etc.
Effect embodiment is applied to other fields, but every without departing from technical solution of the present invention content, according to technical spirit of the invention
Any simple modification, equivalent variations and the remodeling made to above example, still fall within the protection domain of technical solution of the present invention.
Claims (3)
1. a kind of resin-coated sand shell mould covers the casting technique of steel sand solidification, including formative technology and solidification are controlled, it is characterised in that：Institute
Formative technology is stated using two kinds of Material cladding moulding, including facing sand and floor sand, the facing sand is two kinds of different heat conduction systems with floor sand
Several materials.
2. a kind of resin-coated sand shell mould covers the casting technique of steel sand solidification according to claim 1, it is characterised in that：The facing sand
It is precoated sand, the floor sand is steel sand, using steel sandbox, sizing is tamped with steel sand between facing sand and sandbox.
3. a kind of resin-coated sand shell mould covers the casting technique of steel sand solidification according to claim 2, it is characterised in that：The overlay film
Sand is shell mould, and shell mould thickness is 6~30mm；1~2.5mm of the steel sand granularity, form factor is not more than 20% less than 0.8,
Degree of purity more than 90%；Steel sand thickness is more than 1 times of casting section thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710003141.2A CN106807888A (en) | 2017-01-04 | 2017-01-04 | A kind of resin-coated sand shell mould covers the casting technique of steel sand solidification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710003141.2A CN106807888A (en) | 2017-01-04 | 2017-01-04 | A kind of resin-coated sand shell mould covers the casting technique of steel sand solidification |
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| Publication Number | Publication Date |
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| CN106807888A true CN106807888A (en) | 2017-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710003141.2A Pending CN106807888A (en) | 2017-01-04 | 2017-01-04 | A kind of resin-coated sand shell mould covers the casting technique of steel sand solidification |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110202089A (en) * | 2019-07-11 | 2019-09-06 | 北京钢研高纳科技股份有限公司 | The complex modeling method and its application of casting |
| CN111822677A (en) * | 2019-04-11 | 2020-10-27 | 上海航天精密机械研究所 | Light metal casting method based on composite casting mold |
| CN115041665A (en) * | 2022-06-09 | 2022-09-13 | 中国航发北京航空材料研究院 | Aluminum alloy casting device comprising composite casting mold and built-in cooling water path mold core |
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| EP1216771A9 (en) * | 2000-11-28 | 2002-11-20 | Dr.Ing. h.c.F. Porsche Aktiengesellschaft | Inserted core for producing a casting mould and process for the production of such casting mould |
| CN204276810U (en) * | 2014-12-08 | 2015-04-22 | 山东时风（集团）有限责任公司 | A kind of shell mould back of the body ball cooling device |
| CN104525870A (en) * | 2014-12-11 | 2015-04-22 | 牡丹江金缘钩缓制造有限责任公司 | Manufacturing method of buffer box body |
| CN105081228A (en) * | 2014-05-19 | 2015-11-25 | 长沙酉诚凸轮轴制造有限公司 | Casting process for high-strength and low-alloy chilling spheroidal graphite cast iron camshaft blanks |
| CN204817921U (en) * | 2015-07-15 | 2015-12-02 | 繁昌县速诚模具机械制造厂 | Tectorial membrane sand shell mold casting device |
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2017
- 2017-01-04 CN CN201710003141.2A patent/CN106807888A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1216771A9 (en) * | 2000-11-28 | 2002-11-20 | Dr.Ing. h.c.F. Porsche Aktiengesellschaft | Inserted core for producing a casting mould and process for the production of such casting mould |
| CN105081228A (en) * | 2014-05-19 | 2015-11-25 | 长沙酉诚凸轮轴制造有限公司 | Casting process for high-strength and low-alloy chilling spheroidal graphite cast iron camshaft blanks |
| CN204276810U (en) * | 2014-12-08 | 2015-04-22 | 山东时风（集团）有限责任公司 | A kind of shell mould back of the body ball cooling device |
| CN104525870A (en) * | 2014-12-11 | 2015-04-22 | 牡丹江金缘钩缓制造有限责任公司 | Manufacturing method of buffer box body |
| CN204817921U (en) * | 2015-07-15 | 2015-12-02 | 繁昌县速诚模具机械制造厂 | Tectorial membrane sand shell mold casting device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111822677A (en) * | 2019-04-11 | 2020-10-27 | 上海航天精密机械研究所 | Light metal casting method based on composite casting mold |
| CN110202089A (en) * | 2019-07-11 | 2019-09-06 | 北京钢研高纳科技股份有限公司 | The complex modeling method and its application of casting |
| CN115041665A (en) * | 2022-06-09 | 2022-09-13 | 中国航发北京航空材料研究院 | Aluminum alloy casting device comprising composite casting mold and built-in cooling water path mold core |
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Application publication date: 20170609 |
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