CN110076285A - A kind of high temperature resistant resistance to deformation core material and preparation method thereof - Google Patents
A kind of high temperature resistant resistance to deformation core material and preparation method thereof Download PDFInfo
- Publication number
- CN110076285A CN110076285A CN201910343135.0A CN201910343135A CN110076285A CN 110076285 A CN110076285 A CN 110076285A CN 201910343135 A CN201910343135 A CN 201910343135A CN 110076285 A CN110076285 A CN 110076285A
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- Prior art keywords
- high temperature
- temperature resistant
- core material
- deformation
- whisker
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Classifications
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- 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
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
-
- 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
- B22C1/2233—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 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/224—Furan polymers
-
- 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
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
- B22C9/123—Gas-hardening
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The present invention provides a kind of high temperature resistant resistance to deformation core material and preparation method thereof.The core material introduces chill effect excellent chromite and steel fiber on the basis of common core material, significantly improves the Quench ability of sand core, makes to improve the surface smoothness and size positions precision of core cavity prior to other position coagulation formings around sand core.Simultaneously, in introducing high temperature resistant, Gao Qiangren, inexpensive whisker on the basis of common core material, strengthened by the high temperature resistant of whisker and resistance to deformation acts on the high temperature deformation resistance ability for improving sand core, strengthen along with the high temperature resistant of steel fiber and acted on resistance to deformation, significantly improves the high temperature deformation resistance ability of sand core.Improve the surface smoothness and size positions precision of core cavity.Compared with ordinary resin sand core, room temperature tensile intensity of the present invention improves 50~80%, and counter-bending deformation improves 2 times, and collapsibility is suitable with ordinary resin sand core, can satisfy forming requirements and the required precision of the especially complex type chamber of high-power diesel engine cast-internal.Also, the present invention significantly improves complex internal cavity dimension precision and surface smoothness, significantly improves the qualification rate of casting industry, reduces production cost.
Description
Technical field
The present invention relates to cast steel molding sand manufacturing technology field, more particularly, to a kind of high temperature resistant resistance to deformation core material and
Preparation method.
Background technique
With the development of Variable Turbocharger Charging Technology and high-pressure common rail direct injection technology, user to diesel engine power per liter,
Structural compactness, cast shape complexity and thermic load propose increasingly higher demands, to cylinder of diesel engine cover material and
Manufacturing technology is also put forward higher requirements, and is mainly manifested in: 1) internal cavity of diesel engine casting (such as: cylinder cap, cylinder body) is got over
Come more complicated, the sand core shape and structure for forming internal cavity also become increasingly complex (referring to attached drawing 1)；2) inner of bavin casting
The size of chamber, position and surface smoothness requirements are higher and higher；3) the gentle channel type chamber of water jacket inside high power cylinder cover for diesel engine
Between wall thickness it is smaller and smaller (high power density diesel engine water jacket and air flue wall thickness≤5mm), being slightly distorted for sand core will affect
Water jacket and air flue wall thickness (referring to attached drawing 2), directly result in the problems such as part suppresses gas leakage and leak.
However, the Modeling Material and manufacturing process technology of traditional sand casting are not able to satisfy the casting of novel high-power diesel engine
Manufacturing accuracy requirement, manufactured cylinder cover for diesel engine casting qualification rate is very low, and in use because the deformation of cylinder head internal cavity,
The defects of drift and peeling, causes gas leakage and leak and is easy to scrap.
Summary of the invention
The present invention provides a kind of high temperature resistant resistance to deformation core material and preparation method thereof, solves existing in the prior art asks
Topic.
In order to solve the above technical problems, the technical solution used in the present invention are as follows:
A kind of high temperature resistant resistance to deformation core material, the mass percentage composition of the core material are as follows:
Further, it is commercially available carbon steel wire and low that the chromite, quartz sand size, which are 50-150 mesh, steel fiber,
Alloy-steel wire, 0.5~2mm long of diameter, 6~15mm；Furane resins are furan resin for casting.
Further, the whisker is calcium sulfate crystal whiskers or alumina whisker, average diameter 1-8um, average length
30-200um。
Further, comprising the following steps:
1) mulling
Chromite, steel fiber and quartz sand are mixed in proportion, refractory aggregate is made；In batches into refractory aggregate
Whisker is added, and stirs, 20-80 revs/min of mixing speed, whisker additional amount be 5-8%/batch；After the completion of whisker is added, furan is added
Furane resins simultaneously high-speed stirred 2-5 minutes, mixing speed was 100-500 revs/min, and high temperature resistant resistance to deformation core material is made；
2) coremaking and solidification
High temperature resistant resistance to deformation core material is reloaded into core model, slight compression moulding；It is hard to whole to be passed through CO2 gas
Change；The high temperature resistant resistance to deformation core material of the preparation must complete coremaking in 30 minutes.
The beneficial effects of the present invention are:
1, core material of the present invention introduces chill effect excellent chromite and steel fibre on the basis of common core material
Silk, significantly improves the Quench ability of sand core, makes to reduce sand core prior to other position coagulation formings around sand core and bear high-temperature baking
Time.
2, core material of the present invention introduces steel fiber and whisker, using the unbending of steel fiber and whisker, significantly
Improve high temperature resistance and non-deformability, especially high temperature resistant non-deformability.Compared with ordinary resin sand core, room temperature is anti-
Tensile strength improves 50~80%, and counter-bending deformation improves 2 times.
2, the collapsibility of sand core and ordinary resin sand core are suitable, and it is especially complex to can satisfy high-power diesel engine cast-internal
The forming requirements of type chamber and required precision.
3, high temperature resistant resistance to deformation sand core and preparation method thereof of the invention can be generalized to all parts in casting industry
In complex internal type chamber preparation process, complex internal cavity dimension precision and surface smoothness are significantly improved.
4, it improves the elevated temperature strength of complicated sand core and prevents from deforming, significantly improve cylinder head interior shape precision and size
Precision effectively improves the yield rate of cylinder head.
Figure of description
Fig. 1 is the internal cavity of high power cylinder cover for diesel engine in the prior art and complicated sand core model；
Fig. 2 is that the deformation of sand core in the prior art makes cylinder head jacket and air flue wall thickness figure；
Fig. 3 is high temperature resistant resistance to deformation sand core of the invention；
Fig. 4 is the cylinder head using high temperature resistant resistance to deformation sand core of the present invention preparation；
Fig. 5 is the cylinder head internal anatomy using high temperature resistant resistance to deformation sand core of the present invention preparation.
Specific embodiment
The contents of the present invention are described in detail below with reference to embodiment and attached drawing:
Basic ideas of the invention are: size and position precision in order to improve cylinder head internal cavity are prevented due to sand
Core deformation, influence the wall thickness between water jacket and air flue and caused by gas leakage and water leakage defect, it is anti-that the present invention designs a kind of high temperature resistant
Core material and preparation method thereof is deformed, a certain amount of high temperature resistant, high intensity, high tenacity, inexpensive whisker are introduced in sand core,
By the high temperature resistant invigoration effect of whisker, the non-deformability of sand core is significantly improved, utilizes novel core material chilling action
It is acted on high temperature resistant, solidifies the inside complex-shaped surface mould of casting first.In conjunction with the special designing of core print, reach cast-internal complexity
The purpose of type chamber precise forming improves cast-internal complex-shaped surface mould formed precision and surface smoothness.
The present invention is further detailed below by several embodiments:
Embodiment 1:
A kind of high temperature resistant resistance to deformation core material, consisting of (mass percent): chromite 60%, steel fiber
10%, quartz sand 17%, whisker 10%, furane resins 3%.Wherein: chromite, quartz sand are commercially available chromite sand and stone
Sand, granularity are 100 mesh；Steel fiber is commercially available carbon steel wire, diameter 1mm long 10mm；Furane resins are commercially available casting use
Furane resins；Whisker is commercially available calcium sulfate crystal whiskers or alumina whisker, average diameter 6um, average length 150um.
A kind of preparation method of high temperature resistant resistance to deformation sand core, including following preparation steps:
1) mulling
Chromite and quartz sand are mixed in proportion, refractory aggregate is made；Whisker is added portionwise into refractory aggregate,
And stir, 60 revs/min of mixing speed, whisker additional amount be 6%/batch；After the completion of whisker is added, furane resins and high-speed stirring is added
It mixes 4 minutes, mixing speed is 300 revs/min, and high temperature resistant resistance to deformation core material is made；
2) coremaking and solidification
High temperature resistant resistance to deformation core material is reloaded into core model, slight compression moulding；It is hard to whole to be passed through CO2 gas
Change.Prepared high temperature resistant resistance to deformation core material must complete coremaking in 30 minutes, referring to Fig. 3.
The type core casting completed through this embodiment has part to have fine inside dimension and surface smoothness, can
Meet forming requirements and the required precision of the especially complex type chamber of high-power diesel engine cast-internal, referring to fig. 4 and Fig. 5.
Embodiment 2:
A kind of high temperature resistant resistance to deformation core material, consisting of: chromite 40%, steel fiber 15%, quartz sand 25%,
Whisker 15%, furane resins 5%.Wherein: chromite, quartz sand are commercially available chromite sand and quartz sand, and granularity is 100
Mesh；Steel fiber is commercially available carbon steel wire, diameter 0.5mm long 6mm；Furane resins are commercially available furan resin for casting.Whisker is
Commercially available calcium sulfate crystal whiskers or alumina whisker, average diameter 3um, average length 200um.
A kind of preparation method of high temperature resistant resistance to deformation sand core, including following preparation steps:
1) mulling
Chromite and quartz sand are mixed in proportion, refractory aggregate is made；Whisker is added portionwise into refractory aggregate,
And stir, 80 revs/min of mixing speed, whisker additional amount be 5%/batch；After the completion of whisker is added, furane resins and high-speed stirring is added
It mixes 5 minutes, mixing speed is 500 revs/min, and high temperature resistant resistance to deformation core material is made；
2) coremaking and solidification
High temperature resistant resistance to deformation core material is reloaded into core model, slight compression moulding；It is hard to whole to be passed through CO2 gas
Change.Prepared high temperature resistant resistance to deformation core material must complete coremaking in 30 minutes.
Embodiment 3:
A kind of high temperature resistant resistance to deformation core material, consisting of: chromite 75%, steel fiber 5%, quartz sand 10%,
Whisker 5%, furane resins 5%.Wherein: chromite, quartz sand are commercially available chromite sand and quartz sand, and granularity is 100
Mesh；Steel fiber is commercially available carbon steel wire, diameter 2mm long 15mm；Furane resins are commercially available furan resin for casting.Whisker is city
The calcium sulfate crystal whiskers or alumina whisker sold, average diameter 3um, average length 60um.
A kind of preparation method of high temperature resistant resistance to deformation sand core, including following preparation steps:
1) mulling
Chromite and quartz sand are mixed in proportion, refractory aggregate is made；Whisker is added portionwise into refractory aggregate,
And stir, 40 revs/min of mixing speed, whisker additional amount be 5%/batch；After the completion of whisker is added, furane resins and high-speed stirring is added
It mixes 2 minutes, mixing speed is 150 revs/min, and high temperature resistant resistance to deformation core material is made；
2) coremaking and solidification
High temperature resistant resistance to deformation core material is reloaded into core model, slight compression moulding；It is passed through CO2Gas is hard to whole
Change.Prepared high temperature resistant resistance to deformation core material must complete coremaking in 30 minutes.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to
According to thought of the invention, several simple deductions, deformation or replacement can also be made.
Claims (4)
1. a kind of high temperature resistant resistance to deformation core material, it is characterised in that: the mass percentage composition of the core material is as follows:
2. high temperature resistant resistance to deformation core material according to claim 1, it is characterised in that: the chromite, quartzy sand grains
Degree be 50-150 mesh, steel fiber be commercially available carbon steel wire and low-alloy steel wire, 0.5~2mm long of diameter, 6~15mm；Furans tree
Rouge is furan resin for casting.
3. high temperature resistant resistance to deformation core material according to claim 1 or claim 2, it is characterised in that: the whisker is calcium sulfate
Whisker or alumina whisker, average diameter 1-8um, average length 30-200um.
4. the preparation method of high temperature resistant resistance to deformation core material according to claim 1, it is characterised in that: including following step
It is rapid:
1) mulling
Chromite, steel fiber and quartz sand are mixed in proportion, refractory aggregate is made；It is added portionwise into refractory aggregate
Whisker, and stirring, 20-80 revs/min of mixing speed, whisker additional amount be 5-8%/batch；After the completion of whisker is added, furans tree is added
Rouge simultaneously high-speed stirred 2-5 minutes, mixing speed was 100-500 revs/min, and high temperature resistant resistance to deformation core material is made；
2) coremaking and solidification
High temperature resistant resistance to deformation core material is reloaded into core model, slight compression moulding；It is passed through CO2Gas is to through-hardening；It is described
The high temperature resistant resistance to deformation core material of preparation must complete coremaking in 30 minutes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910343135.0A CN110076285B (en) | 2019-04-26 | 2019-04-26 | High-temperature-resistant anti-deformation sand core material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910343135.0A CN110076285B (en) | 2019-04-26 | 2019-04-26 | High-temperature-resistant anti-deformation sand core material and preparation method thereof |
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| Publication Number | Publication Date |
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| CN110076285A true CN110076285A (en) | 2019-08-02 |
| CN110076285B CN110076285B (en) | 2020-11-17 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102728784A (en) * | 2012-06-08 | 2012-10-17 | 繁昌县琦祥铸造厂 | Clay-type molding sand and preparation method thereof |
| CN103056281A (en) * | 2012-12-12 | 2013-04-24 | 青岛三合山精密铸造有限公司 | Preparation method of molding sands |
| CN103521693A (en) * | 2013-10-16 | 2014-01-22 | 合肥市田源精铸有限公司 | High-efficiency chilling molding sand and preparation method thereof |
| CN103567359A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Clay green sand for high-pressure molding and preparation method thereof |
| CN107695285A (en) * | 2017-10-17 | 2018-02-16 | 淄博柴油机总公司 | The sand mulling craft of jacket core in diesel engine cylinder cover cast blank |
| CN108296418A (en) * | 2017-09-29 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of precoated sand and preparation method thereof for 3D printing |
| CN109305803A (en) * | 2018-10-22 | 2019-02-05 | 沈阳明禾石英制品有限责任公司 | Magnesia crystal whisker enhances ceramic core and preparation method thereof |
-
2019
- 2019-04-26 CN CN201910343135.0A patent/CN110076285B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102728784A (en) * | 2012-06-08 | 2012-10-17 | 繁昌县琦祥铸造厂 | Clay-type molding sand and preparation method thereof |
| CN103056281A (en) * | 2012-12-12 | 2013-04-24 | 青岛三合山精密铸造有限公司 | Preparation method of molding sands |
| CN103567359A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Clay green sand for high-pressure molding and preparation method thereof |
| CN103521693A (en) * | 2013-10-16 | 2014-01-22 | 合肥市田源精铸有限公司 | High-efficiency chilling molding sand and preparation method thereof |
| CN108296418A (en) * | 2017-09-29 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of precoated sand and preparation method thereof for 3D printing |
| CN107695285A (en) * | 2017-10-17 | 2018-02-16 | 淄博柴油机总公司 | The sand mulling craft of jacket core in diesel engine cylinder cover cast blank |
| CN109305803A (en) * | 2018-10-22 | 2019-02-05 | 沈阳明禾石英制品有限责任公司 | Magnesia crystal whisker enhances ceramic core and preparation method thereof |
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| CN110076285B (en) | 2020-11-17 |
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