CN105014007A - Application method of roughing sand calcination technology to casting and sand core - Google Patents
Application method of roughing sand calcination technology to casting and sand core Download PDFInfo
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- CN105014007A CN105014007A CN201510514281.7A CN201510514281A CN105014007A CN 105014007 A CN105014007 A CN 105014007A CN 201510514281 A CN201510514281 A CN 201510514281A CN 105014007 A CN105014007 A CN 105014007A
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Abstract
The invention discloses an application method of a roughing sand calcination technology to a casting. The method comprises the following steps that firstly, fresh sand is screened, and impurities are removed; secondly, calcination is carried out at a high temperature being 900 DEG C, and the phase change of silicon dioxide occurs; thirdly, after the calcination is carried out, the fresh sand is naturally cooled until the fresh sand is at the normal temperature; and fourthly, a core is prepared. The high temperature calcination is carried out on the fresh sand, so that the addition quantity of resin is reduced, the gas-forming amount of precoated sand is reduced, the thermal stability of the precoated sand is high, the high temperature expansion is irreversible, and the dimensional accuracy of the casting can be guaranteed accordingly.
Description
Technical field
The present invention relates to casting technology field, more particularly, it relates to the application process of roughing sand roasting technology on foundry goods and core.
Background technology
At present, in the manufacture craft of casting sand core, primarily of roughing sand preparation precoated sand, and add resin, organic adjuvants makes it shaping.Precoated sand get angry by roughing sand, resin, organic adjuvants at high temperature burn produce gas formed, gas in roughing sand is gasified by the impurity in silica sand, decomposes and burn to produce, the constitution water produced as the constitution water in mica and the contour ridge of feldspar rusticization is at high temperature overflowed, though the gas decomposed under also having some metal oxide high-temperatures and through cleaning the organic matter combustion gas etc. at high temperature of drying not Ex-all.When the phenomenon of getting angry is more serious, core easily occurs defeated and dispersed, and core cavity is of poor quality.
Summary of the invention
The object of the present invention is to provide the application process of roughing sand roasting technology on foundry goods and core, mainly for reducing resin amount, reduce precoated sand gas forming amount, make its heat endurance high, high-temperature expansion is irreversible, thus the dimensional accuracy of foundry goods can be ensured, to overcome deficiency existing in prior art.
The technical scheme that the present invention solves its technical problem is: the application process of a kind of roughing sand roasting technology on foundry goods, comprises the following steps:
S1) fresh sand sieves, and impurity is removed;
S2) 900 DEG C of high-temperature roastings, make silica undergo phase transition;
S3) roughing sand after roasting naturally cools to normal temperature;
S4) coremaking.
One such application method obtains the core of roasting sand, comprises core sand head, described core sand head local dent, and described core sand head inner hollow forms Lightened structure, is provided with and emits oral cavity, emit on the sidewall in oral cavity and arrange riser feeding passage at the far-end of core sand head; Described core is obtained by roasting sand.
Described core is roughly rotary structure, described core by roasting sand, binding agent, that curing agent mixes solidification is obtained.
Described binding agent is resin.
The invention has the beneficial effects as follows:
1) owing to changing the physicochemical property of sand grain surface after roughing sand roasting.Be embodied in the constitution water effusion in sand grain surface impurity, especially the alkaline impurities affecting precoated sand intensity is at high temperature peeled off with sand grains, produce a large amount of dust, need in producing to increase wind-force dust arrester for this reason, which enhance degree of purity and the weld point temperature of roughing sand, increase substantially the intensity of precoated sand.
2) after roughing sand roasting, the α quartz inversion in roughing sand is α tridymite, and volume expands, and surface area reduces, and is conducive to the bonding reaction between resin and sand grain surface, thus improves its strength character by a larger margin.The phase transformation of roughing sand roasting generation silica adds the activity energy on roughing sand surface.
3) there is low characteristic of getting angry after roughing sand roasting.Precoated sand get angry be not singly resin, organic adjuvants at high temperature burn produce gas, also comprise the gas that roughing sand at high temperature produces.And the gas in roughing sand is gasified by the impurity in silica sand, decomposes and burn to produce, the constitution water produced as the constitution water in mica and the contour ridge of feldspar rusticization is at high temperature overflowed, though the gas decomposed under also having some metal oxide high-temperatures and through cleaning the organic matter combustion gas etc. at high temperature of drying not Ex-all.Roughing sand has also just deducted this part gas forming amount through high-temperature roasting.
4) based on the features of shape of roasting roughing sand, the wearing and tearing of made core to mould are less, and core release property is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of roughing sand roasting core of the present invention
Fig. 2 is the A-A sectional view of Fig. 1
Fig. 3 is the top view of Fig. 1.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
The invention provides the application process of a kind of roughing sand roasting technology on foundry goods, comprise the following steps:
S1) fresh sand sieves, and impurity is removed;
S2) 900 DEG C of high-temperature roastings, make silica undergo phase transition;
S3) roughing sand after roasting naturally cools to normal temperature;
S4) coremaking.
The technique of roasting roughing sand preparation precoated sand is identical with the technique that general roughing sand prepares precoated sand, but is salmon pink through the precoated sand of roasting roughing sand preparation, has significant outward appearance to distinguish with general precoated sand.
Why roasting roughing sand can increase substantially the intensity of precoated sand, mainly owing to changing the physicochemical property of sand grain surface after roughing sand roasting.The phase transformation of roughing sand roasting generation silica adds the activity energy on roughing sand surface.After roughing sand roasting, the α quartz inversion in roughing sand is α tridymite, and volume expands, and surface area reduces, and is conducive to the bonding reaction between resin and sand grain surface, thus improves its strength character by a larger margin.There is after roughing sand roasting low characteristic of getting angry.Precoated sand get angry be not singly resin, organic adjuvants at high temperature burn produce gas, also comprise the gas that roughing sand at high temperature produces.And the gas in roughing sand is gasified by the impurity in silica sand, decomposes and burn to produce, the constitution water produced as the constitution water in mica and the contour ridge of feldspar rusticization is at high temperature overflowed, though the gas decomposed under also having some metal oxide high-temperatures and through cleaning the organic matter combustion gas etc. at high temperature of drying not Ex-all.Roughing sand has also just deducted this part gas forming amount through high-temperature roasting.
Roasting roughing sand is entity silica sand, belong to phase transformation sand, dihedral coefficient is less than 1.2, and the dihedral coefficient of existing conventional chrome ore chamotte sand etc. is larger, easilier than roasting roughing sand hold resin, therefore, use roasting roughing sand to reduce resin demand, be conducive to the collapsibility improving core, improve core cavity quality.Obtain after high-temperature roasting, preparation process undergoes phase transition, and main component is silica.Obtained sand core strength is high, and can meet severe casting environment, can produce larger core, and casting process does not rupture, have larger heat storage coefficient, casting process deflection is little, can meet casting technique requirement.
See Fig. 1-3, the invention provides a kind of core of roughing sand roasting, comprise core sand head 1, described core sand head has the local dent 2 for locating, described core sand head inner hollow forms Lightened structure 3, be provided with at the far-end of core sand head and emit oral cavity 4, emit on the sidewall in oral cavity and riser feeding passage 5 is set; Described core is obtained by roasting sand.
Core is roughly rotary structure, and core is automotive hub core.
Core is mixed solidification obtained by roasting sand, binding agent, curing agent, and binding agent is resin.
Although illustrate and describe embodiments of the invention; those of ordinary skill in the art is to be understood that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim; scope of the present invention limited by claim and equivalent replacement thereof; in the improvement etc. done without creative work, all should be included within protection scope of the present invention.
Claims (4)
1. the application process of roughing sand roasting technology on foundry goods, is characterized in that comprising the following steps:
S1) fresh sand sieves, and impurity is removed;
S2) 900 DEG C of high-temperature roastings, make silica undergo phase transition;
S3) roughing sand after roasting naturally cools to normal temperature;
S4) coremaking.
2. the core adopting application process described in claim 1 to obtain roasting sand, it is characterized in that: comprise core sand head, described core sand head local dent, described core sand head inner hollow forms Lightened structure, be provided with at the far-end of core sand head and emit oral cavity, emit on the sidewall in oral cavity and riser feeding passage is set; Described core is obtained by roasting sand.
3. core according to claim 2, is characterized in that: described core is roughly rotary structure, described core by roasting sand, binding agent, that curing agent mixes solidification is obtained.
4. core according to claim 3, is characterized in that: described binding agent is resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510514281.7A CN105014007A (en) | 2015-08-21 | 2015-08-21 | Application method of roughing sand calcination technology to casting and sand core |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510514281.7A CN105014007A (en) | 2015-08-21 | 2015-08-21 | Application method of roughing sand calcination technology to casting and sand core |
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| CN105014007A true CN105014007A (en) | 2015-11-04 |
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| CN201510514281.7A Pending CN105014007A (en) | 2015-08-21 | 2015-08-21 | Application method of roughing sand calcination technology to casting and sand core |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111168014A (en) * | 2020-02-28 | 2020-05-19 | 广西玉柴机器股份有限公司 | Sand core structure and method for solving sand inclusion problem generated by resin sand core of main oil duct of large machine |
| CN111375727A (en) * | 2020-04-22 | 2020-07-07 | 天津致勤新型材料有限公司 | 3D printing sand, high-temperature and cooling treatment process and application thereof |
| CN112317677A (en) * | 2020-09-24 | 2021-02-05 | 中国第一汽车股份有限公司 | Cold core sand formula for water jacket core of passenger car cylinder body |
| CN112358213A (en) * | 2020-06-29 | 2021-02-12 | 北京仁创科技集团有限公司 | Water permeable material and application thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111168014A (en) * | 2020-02-28 | 2020-05-19 | 广西玉柴机器股份有限公司 | Sand core structure and method for solving sand inclusion problem generated by resin sand core of main oil duct of large machine |
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| CN111375727A (en) * | 2020-04-22 | 2020-07-07 | 天津致勤新型材料有限公司 | 3D printing sand, high-temperature and cooling treatment process and application thereof |
| CN112358213A (en) * | 2020-06-29 | 2021-02-12 | 北京仁创科技集团有限公司 | Water permeable material and application thereof |
| CN112317677A (en) * | 2020-09-24 | 2021-02-05 | 中国第一汽车股份有限公司 | Cold core sand formula for water jacket core of passenger car cylinder body |
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Application publication date: 20151104 |