CN110076285B - High-temperature-resistant anti-deformation sand core material and preparation method thereof - Google Patents
High-temperature-resistant anti-deformation sand core material and preparation method thereof Download PDFInfo
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- CN110076285B CN110076285B CN201910343135.0A CN201910343135A CN110076285B CN 110076285 B CN110076285 B CN 110076285B CN 201910343135 A CN201910343135 A CN 201910343135A CN 110076285 B CN110076285 B CN 110076285B
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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
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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
- B22C1/16—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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- 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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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention provides a high-temperature-resistant anti-deformation sand core material and a preparation method thereof. The chromite and steel fiber wires with excellent chilling effect are introduced into the sand core material on the basis of the common sand core material, the chilling capability of the sand core is obviously improved, the periphery of the sand core is solidified and molded before other parts, and the surface finish degree and the dimensional position precision of the inner cavity of the casting are improved. Meanwhile, on the basis of a common sand core material, whiskers with high temperature resistance, high strength and toughness and low cost are introduced, the high temperature deformation resistance of the sand core is improved through the high temperature resistance strengthening and deformation resistance of the whiskers, and the high temperature deformation resistance of the sand core is obviously improved through the high temperature resistance strengthening and deformation resistance of steel fiber wires. The surface finish degree and the dimensional position precision of the inner cavity of the casting are improved. Compared with the common resin sand core, the room-temperature tensile strength of the invention is improved by 50-80%, the bending deformation resistance is improved by 2 times, the collapsibility is equivalent to that of the common resin sand core, and the molding requirement and the precision requirement of a special complex cavity in a high-power diesel engine casting can be met. In addition, the invention obviously improves the dimensional accuracy and the surface smoothness of the complex internal cavity, obviously improves the qualification rate of the casting industry and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of manufacturing of molding sand for steel casting, in particular to a high-temperature-resistant deformation-resistant sand core material and a preparation method thereof.
Background
With the development of the variable turbocharging technology and the high-pressure common rail direct injection technology, users put forward higher and higher requirements on the power-up, the structural compactness, the casting shape complexity and the heat load of the diesel engine, and put forward higher requirements on the material and the manufacturing technology of the cylinder cover of the diesel engine, which is mainly represented as follows: 1) diesel engine castings (such as: cylinder covers and cylinder bodies) and the shape and structure of the sand cores forming the internal cavities (see fig. 1); 2) the requirements on the size, the position and the surface finish of an internal cavity of the wood casting are higher and higher; 3) the wall thickness between the water jacket and the air passage cavity in the cylinder cover of the high-power diesel engine is smaller and smaller (the wall thickness of the water jacket and the air passage of the high-power density diesel engine is less than or equal to 5mm), and the slight deformation of the sand core influences the wall thickness of the water jacket and the air passage (see figure 2), so that the problems of part pressing, air leakage, water leakage and the like are directly caused.
However, the molding material and the manufacturing process of the traditional sand casting cannot meet the casting precision requirement of the novel high-power diesel engine, the casting yield of the manufactured diesel engine cylinder cover is very low, and the manufactured diesel engine cylinder cover is easy to scrap due to air leakage and water leakage caused by the defects of deformation, drifting, peeling and the like of the internal cavity of the cylinder cover in use.
Disclosure of Invention
The invention provides a high-temperature-resistant anti-deformation sand core material and a preparation method thereof, which solve the problems in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a high-temperature-resistant anti-deformation sand core material comprises the following components in percentage by mass:
furthermore, the particle sizes of the chromite and the quartz sand are both 50-150 meshes, the steel fiber wires are commercially available carbon steel wires and low alloy steel wires, and the diameter is 0.5-2 mm, and the length is 6-15 mm; the furan resin is used for casting.
Furthermore, the whisker is calcium sulfate whisker or alumina whisker, the average diameter is 1-8um, and the average length is 30-200 um.
Further, the method comprises the following steps:
1) sand mixing
Uniformly mixing chromite, steel fiber wires and quartz sand in proportion to prepare refractory aggregate; adding the whiskers into the refractory aggregate in batches, and stirring at the stirring speed of 20-80 rpm, wherein the adding amount of the whiskers is 5-8% per batch; after the whisker is added, adding furan resin and stirring at a high speed of 100-500 rpm for 2-5 minutes to prepare the high-temperature-resistant and deformation-resistant sand core material;
2) core making and curing
Filling the high-temperature-resistant and deformation-resistant sand core material into a core mold, and slightly pressing and forming; introducing CO2 gas until the hardening is completed; the prepared high-temperature-resistant anti-deformation sand core material has to complete core making within 30 minutes.
The invention has the beneficial effects that:
1. the chromite and steel fiber wires with excellent chilling effect are introduced into the sand core material based on the common sand core material, so that the chilling capability of the sand core is obviously improved, the periphery of the sand core is solidified and formed before other parts, and the time of the sand core bearing high-temperature baking is reduced.
2. The sand core material of the invention introduces the steel fiber wires and the crystal whiskers, and obviously improves the high temperature resistance and the anti-deformation capability, in particular the high temperature resistance and the anti-deformation capability by utilizing the anti-bending function of the steel fiber wires and the crystal whiskers. Compared with the common resin sand core, the tensile strength at room temperature is improved by 50-80%, and the bending deformation resistance is improved by 2 times.
2. The collapsibility of the sand core is equivalent to that of a common resin sand core, and the molding requirement and the precision requirement of a special complex cavity inside a high-power diesel engine casting can be met.
3. The high-temperature-resistant anti-deformation sand core and the preparation method thereof can be popularized to the preparation process of the complex internal cavity of all parts in the casting industry, and the dimensional precision and the surface smoothness of the complex internal cavity are obviously improved.
4. The high-temperature strength of the complex sand core is improved, deformation is prevented, the shape precision and the size precision of the interior of the cylinder cover are obviously improved, and the yield of the cylinder cover is effectively improved.
Drawings
FIG. 1 is a prior art internal cavity and complex sand core model of a cylinder head of a medium and high power diesel engine;
FIG. 2 is a prior art diagram of deformation of a sand core to account for cylinder head water jacket and air passage wall thickness;
FIG. 3 is a high temperature resistant and deformation resistant sand core of the present invention;
FIG. 4 is a cylinder head made using the high temperature resistant and deformation resistant sand core of the present invention;
FIG. 5 is a schematic view of a cylinder head made with the refractory and deformation resistant sand core of the present invention.
Detailed Description
The invention is explained in detail below with reference to the examples and the figures:
the basic idea of the invention is as follows: in order to improve the size and position accuracy of a cavity in a cylinder cover and prevent the defects of air leakage and water leakage caused by the influence of sand core deformation on the wall thickness between a water jacket and an air passage, the invention designs a high-temperature-resistant deformation-resistant sand core material and a preparation method thereof. And the special design of the core print is combined, so that the purpose of accurately molding the complex cavity in the casting is achieved, and the molding precision and the surface finish of the complex cavity in the casting are improved.
The invention is further illustrated by the following examples:
example 1:
a high-temperature-resistant deformation-resistant sand core material comprises the following components in percentage by mass: 60% of chromite, 10% of steel fiber wires, 17% of quartz sand, 10% of whiskers and 3% of furan resin. Wherein: the chromite and the quartz sand are commercial chromite sand and quartz sand, and the granularity is 100 meshes; the steel fiber wire is a commercially available carbon steel wire, the diameter of which is 1mm and the length of which is 10 mm; the furan resin is a commercial furan resin for casting; the whiskers are calcium sulfate whiskers or alumina whiskers sold in the market, the average diameter is 6um, and the average length is 150 um.
The preparation method of the high-temperature-resistant anti-deformation sand core comprises the following preparation steps:
1) sand mixing
Mixing chromite and quartz sand uniformly according to a proportion to prepare refractory aggregate; adding the whiskers into the refractory aggregate in batches, and stirring at the stirring speed of 60 revolutions per minute, wherein the adding amount of the whiskers is 6 percent per batch; after the whisker is added, adding furan resin and stirring at a high speed of 300 revolutions per minute for 4 minutes to prepare a high-temperature-resistant deformation-resistant sand core material;
2) core making and curing
Filling the high-temperature-resistant and deformation-resistant sand core material into a core mold, and slightly pressing and forming; introducing CO2 gas until all the components are hardened. The prepared high temperature resistant and deformation resistant sand core material has to complete the core making within 30 minutes, see fig. 3.
The parts cast by the core finished by the embodiment have fine internal dimension and surface finish, and can meet the molding requirement and precision requirement of a particularly complex cavity in a high-power diesel engine casting, and refer to fig. 4 and 5.
Example 2:
a high-temperature-resistant deformation-resistant sand core material comprises the following components: 40% of chromite, 15% of steel fiber wire, 25% of quartz sand, 15% of whisker and 5% of furan resin. Wherein: the chromite and the quartz sand are commercial chromite sand and quartz sand, and the granularity is 100 meshes; the steel fiber wire is a commercially available carbon steel wire, the diameter of which is 0.5mm and the length of which is 6 mm; the furan resin is a commercially available furan resin for casting. The whiskers are calcium sulfate whiskers or alumina whiskers sold in the market, the average diameter is 3um, and the average length is 200 um.
The preparation method of the high-temperature-resistant anti-deformation sand core comprises the following preparation steps:
1) sand mixing
Mixing chromite and quartz sand uniformly according to a proportion to prepare refractory aggregate; adding the whiskers into the refractory aggregate in batches, and stirring at the stirring speed of 80 rpm, wherein the adding amount of the whiskers is 5% per batch; after the whisker is added, adding furan resin and stirring at a high speed of 500 rpm for 5 minutes to prepare a high-temperature-resistant deformation-resistant sand core material;
2) core making and curing
Filling the high-temperature-resistant and deformation-resistant sand core material into a core mold, and slightly pressing and forming; introducing CO2 gas until all the components are hardened. The prepared high-temperature resistant and deformation resistant sand core material has to complete core making within 30 minutes.
Example 3:
a high-temperature-resistant deformation-resistant sand core material comprises the following components: 75% of chromite, 5% of steel fiber wires, 10% of quartz sand, 5% of whiskers and 5% of furan resin. Wherein: the chromite and the quartz sand are commercial chromite sand and quartz sand, and the granularity is 100 meshes; the steel fiber wire is a commercially available carbon steel wire, the diameter of which is 2mm and the length of which is 15 mm; the furan resin is a commercially available furan resin for casting. The whiskers are calcium sulfate whiskers or alumina whiskers sold in the market, the average diameter is 3um, and the average length is 60 um.
The preparation method of the high-temperature-resistant anti-deformation sand core comprises the following preparation steps:
1) sand mixing
Mixing chromite and quartz sand uniformly according to a proportion to prepare refractory aggregate; adding the whiskers into the refractory aggregate in batches, and stirring at the stirring speed of 40 revolutions per minute, wherein the adding amount of the whiskers is 5 percent per batch; after the whisker is added, adding furan resin and stirring at a high speed of 150 rpm for 2 minutes to prepare a high-temperature-resistant deformation-resistant sand core material;
2) core making and curing
Filling the high-temperature-resistant and deformation-resistant sand core material into a core mold, and slightly pressing and forming; introducing CO2Gas to full cure. The prepared high-temperature resistant and deformation resistant sand core material has to complete core making within 30 minutes.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For those skilled in the art to which the invention pertains
Several simple deductions, modifications or substitutions can also be made according to the idea of the invention.
Claims (2)
1. A high temperature resistant anti-deformation sand core material is characterized in that: the sand core material comprises the following components in percentage by mass:
40-75% of chromite;
5-15% of steel fiber filaments;
10-25% of quartz sand;
5-20% of whisker;
3-5% of furan resin;
the particle sizes of the chromite and the quartz sand are both 50-150 meshes; the steel fiber wire is a commercially available carbon steel wire or low alloy steel wire, and the diameter of the steel fiber wire is 0.5-2 mm, and the length of the steel fiber wire is 6-15 mm; the furan resin is used for casting;
the whiskers are calcium sulfate whiskers or alumina whiskers, the average diameter is 1-8 mu m, and the average length is 30-200 mu m.
2. The method for preparing the high temperature and deformation resistant sand core material according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:
1) sand mixing
Uniformly mixing chromite, steel fiber wires and quartz sand in proportion to prepare refractory aggregate; adding the whiskers into the refractory aggregate in batches, and stirring at the stirring speed of 20-80 rpm, wherein the adding amount of the whiskers is 5-8% per batch; after the whisker is added, adding furan resin and stirring at a high speed of 100-500 rpm for 2-5 minutes to prepare the high-temperature-resistant and deformation-resistant sand core material;
2) core making and curing
Filling the high-temperature-resistant and deformation-resistant sand core material into a core mold, and slightly pressing and forming; introducing CO2Gas to full cure; the prepared high-temperature-resistant anti-deformation sand core material has to complete core making within 30 minutes.
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| CN110076285B true CN110076285B (en) | 2020-11-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102728784B (en) * | 2012-06-08 | 2014-03-12 | 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 |
| CN108296418B (en) * | 2017-09-29 | 2020-04-10 | 柳州市柳晶科技股份有限公司 | Precoated sand for 3D printing 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 |
| 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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