CN101433941A - Green-sand for copper alloy relief decorative panel and preparation technique thereof - Google Patents
Green-sand for copper alloy relief decorative panel and preparation technique thereof Download PDFInfo
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- CN101433941A CN101433941A CNA2008102040440A CN200810204044A CN101433941A CN 101433941 A CN101433941 A CN 101433941A CN A2008102040440 A CNA2008102040440 A CN A2008102040440A CN 200810204044 A CN200810204044 A CN 200810204044A CN 101433941 A CN101433941 A CN 101433941A
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Abstract
The invention discloses wet molding sand for a copper alloy embossing decorative plate and a process for preparing the same. The wet molding sand consists of roughing sand, bentonite, fireproof fiber, water soluble macromolecule and water. The preparation process comprises: according to portions, the roughing sand, bentonite, fireproof fiber, water soluble macromolecule and water are weighed, and the roughing sand, the bentonite and the fireproof fiber are put in a roller sand mill or rotor sand mill for even dry mixing; and, the mixture is added with mixing solution of the water soluble macromolecule and the water for even wet mixing, and the wet molding sand is finally obtained. The wet molding sand has enough high comprehensive performance of molding sand; and when the wet molding sand is used for shaping and casting, the casting defects can be effectively controlled, and the copper alloy embossing decorative plate with clear ornamentation, clear layers and strong stereoscopic sensation is obtained. The preparation process is suitable for manual molding as well as machine molding, and facing sand after casting can be recycled as backing sand; moreover, the preparation process also has the advantages of simple production procedure, high efficiency and convenient production and application.
Description
Technical field
The present invention relates to a kind of molding sand and preparation technology thereof, relate in particular to a kind of green-sand for copper alloy relief decorative panel and preparation technology thereof.
Background technology
Copper alloy relief decorative panel is the art casting that is decorated with plastic relief lines such as sandstone line, rough grain, rubble line, Bark mark, brick line, thick numb line, straw plaited line, bamboo weaving line in the plane.Because the decorative pattern on the plate is very fine, the polishing finishing can not be done in the surface of rough casting, generally should adopt gypsum mould or ceramic mould moulding just can reach requirement, but above-mentioned formative technology needs the roasting dewaxing, the energy consumption height, man-hour is long, output is low, often adopts self-hardening resin sand casting technique cast copper alloy art casting in the prior art for this reason.In self-hardening resin sand technology,,, cause the decorative pattern of cast back cast(ing) surface fuzzy if after the die cavity of decoration plate with relief sculpture imposed coating, its fine decorative pattern can all be covered by dope layer for prevent that foundry goods scab from needing to coat in die cavity.
Green-sand technology need not coated and can directly be poured into a mould in sand casting, and the traditional copper alloy is generally 30～60kPa with the green compression strength of green-sand, and the water content of molding sand (mass fraction) is controlled at 4.5%～5.5%.This green-sand technology can not satisfy the requirement of fine cast of Fe-Mn well, and its molding sand wet strength is lower, and mold cavity surface damages easily during molding, because the particularity of the fine decorative pattern of decorative panel can not be repaiied type, so the useless rate of type is very high; And the type of making is when mould assembling, and the sand grains that forms decorative pattern easily falls into die cavity, and molten metal washes away the sand mold surface and makes sand grains be involved in foundry goods when perhaps pouring into a mould, thereby defectives such as sand washing, burning into sand occur, makes cast(ing) surface coarse simultaneously.
Summary of the invention
Technical problem to be solved by this invention provide a kind ofly have sufficiently high wet strength, than the green-sand and the preparation technology thereof of low water content, this green-sand as the facing sand moulding, can be obtained clear, the well-bedded copper alloy relief decorative panel of surface texturing.
As follows for solving the problems of the technologies described above the technical solution adopted in the present invention:
A kind of green-sand for copper alloy relief decorative panel, form by roughing sand, bentonite, refractory fibre, water soluble polymer and water, wherein the bentonite addition is 5%～10% of a roughing sand quality, the refractory fibre addition is 0.10%～0.25% of a roughing sand quality, the water soluble polymer addition is 0.1%～0.5% of a roughing sand quality, the addition of water was pressed soil ratio (mass parts) 1: 2～1: 3, i.e. water and bentonitic mass ratio.
Described roughing sand is 100/200 order quartz sand; Bentonite is the casting sodium bentonite; Refractory fibre is alumina silicate or alumina short fibre, fibre diameter＜5.0 μ m, fibre length＜3mm; Water soluble polymer is low molecular poly or Sodium Polyacrylate, and wherein the relative molecular mass of polyethylene glycol is 200～800, and the relative molecular mass of Sodium Polyacrylate is 1000～1500.
The present invention simultaneously also provides a kind of preparation technology of above-mentioned green-sand for copper alloy relief decorative panel,
Take by weighing roughing sand, bentonite, refractory fibre, water soluble polymer and water in above-mentioned composition ratio;
With roughing sand, bentonite and refractory fibre add in simpson mill or the rotator mixed sand machine dried be mixed even;
Shake out after adding the mixed liquor wet mixing evenly of water soluble polymer and water again.
In general above-mentioned mixing technique can mix 2～10min for roughing sand, bentonite and refractory fibre being added do in simpson mill or the rotator mixed sand machine; Shake out after adding the mixed liquor wet mixing 15～25min of water soluble polymer and water again.
Refractory fibre in the green-sand technology of the present invention is a kind of have structure between complicated microvoid, random porous media material.In molding sand, introduce the short refractory fibre of some and draw ratio, utilize the bridging of fiber toughness reinforcing with extract effect, can strengthen the ability of molding sand opposing external force scouring, thus the tensile strength and the toughness of raising molding sand.Mixing in the system process fast of green-sand, because the restriction of mulling time and moisture, as the bentonite of binding agent, the flaky texture of its montmorillonite can not get abundant expansion, so bonding efficiency is not in full use.Macromolecule chain section in the low-molecular weight water-soluble macromolecule of institute of the present invention additive has folding and polarity preferably, can quicken the separation between the montmorillonite crystal layer, help bentonite inflated dispersion, make argillic horizon can be evenly distributed in sand grain surface, need not to add a large amount of bentonites, and under the situation of control molding sand than low water content, can obtain higher molding sand green compression strength and plasticity, and help reducing the probability that foundry goods produces gas hole defect.Copper alloy relief decorative panel belongs to the flat-type foundry goods, is easy to generate burning into sand class defective, and the present invention improves its anti-sand carrying capacity by the hot green tensile strength of control molding sand.
Green-sand of the present invention has sufficiently high molding sand combination property, after this green-sand art shapes and cast, can effectively control casting flaw, obtains the copper alloy relief decorative panel that decorative pattern is clear, well arranged, third dimension is strong.Green-sand technology of the present invention is not only applicable to hand moulding, can be used for machine molding yet, and the facing sand after the cast can be used as the floor sand reuse, and production process is simple, efficient is high, is convenient to production application.
Description of drawings
Fig. 1 is preparation technology's flow chart of green-sand for copper alloy relief decorative panel of the present invention.
The specific embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, the specific embodiment of the present invention is elaborated below in conjunction with accompanying drawing:
In following examples, under same test conditions, the wet strength of sample (green compression strength, green tensile strength) height illustrates that the sand molding performance is good, and can reduce the probability that sand hole, loose, buckle defective appear in foundry goods; The hot green tensile strength height of sample can prevent that the burning into sand defective from appearring in foundry goods; The water content of molding sand is low, can reduce the bleb defective.
Embodiment 1
Will 1kg quartz sand, 100g sodium bentonite and 1.0g aluminosilicate refractory fiber add to do in the SHN simpson mill and mix 2min, shake out after adding the mixed liquor wet mixing 15min of the polyethylene glycol of 3g relative molecular mass 200 and 33g water (soil ratio 1: 3) again.Make the cylindrical standard specimen of Φ 50mm * 50mm, measure the green compression strength of sample with SQY hydraulic pressure strength testing machine; Make the wet special-purpose sample that draws, measure the green tensile strength and the hot green tensile strength of sample with the SLR hot wet tensile strength tester; Measure the water content of molding sand with the infrared baker of SGH double plate.
Embodiment 2
Will 1kg quartz sand, 80g sodium bentonite and 1.8g aluminosilicate refractory fiber add to do in the SHN simpson mill and mix 2min, shake out after adding the mixed liquor wet mixing 15min of the Sodium Polyacrylate of 3g relative molecular mass 1500 and 27g water (soil ratio 1: 3) again.Make the cylindrical standard specimen of Φ 50mm * 50mm, measure the green compression strength of sample with SQY hydraulic pressure strength testing machine; Make the wet special-purpose sample that draws, measure the green tensile strength and the hot green tensile strength of sample with the SLR hot wet tensile strength tester; Measure the water content of molding sand with the infrared baker of SGH double plate.
Embodiment 3
Will 1kg quartz sand, 80g sodium bentonite and 2.5g aluminosilicate refractory fiber add to do in the SHN simpson mill and mix 2min, shake out after adding the mixed liquor wet mixing 15min of the polyethylene glycol of 1g relative molecular mass 500 and 40g water (soil ratio 1: 2) again.Make the cylindrical standard specimen of Φ 50mm * 50mm, measure the green compression strength of sample with SQY hydraulic pressure strength testing machine; Make the wet special-purpose sample that draws, measure the green tensile strength and the hot green tensile strength of sample with the SLR hot wet tensile strength tester; Measure the water content of molding sand with the infrared baker of SGH double plate.
Embodiment 4
Will 1kg quartz sand, 70g sodium bentonite and 1.0g aluminium oxide refractory fibre add to do in the SHN simpson mill and mix 2min, shake out after adding the mixed liquor wet mixing 15min of the Sodium Polyacrylate of 5g relative molecular mass 1200 and 23g water (soil ratio 1: 3) again.Make the cylindrical standard specimen of Φ 50mm * 50mm, measure the green compression strength of sample with SQY hydraulic pressure strength testing machine; Make the wet special-purpose sample that draws, measure the green tensile strength and the hot green tensile strength of sample with the SLR hot wet tensile strength tester; Measure the water content of molding sand with the infrared baker of SGH double plate.
Embodiment 5
Will 1kg quartz sand, 70g sodium bentonite and 1.8g aluminium oxide refractory fibre add to do in the SHN simpson mill and mix 2min, shake out after adding the mixed liquor wet mixing 15min of the Sodium Polyacrylate of 1g relative molecular mass 1000 and 35g water (soil ratio 1: 2) again.Make the cylindrical standard specimen of Φ 50mm * 50mm, measure the green compression strength of sample with SQY hydraulic pressure strength testing machine; Make the wet special-purpose sample that draws, measure the green tensile strength and the hot green tensile strength of sample with the SLR hot wet tensile strength tester; Measure the water content of molding sand with the infrared baker of SGH double plate.
Embodiment 6
Will 1kg quartz sand, 50g sodium bentonite and 2.5g aluminium oxide refractory fibre add to do in the SHN simpson mill and mix 2min, shake out after adding the mixed liquor wet mixing 15min of the polyethylene glycol of 5g relative molecular mass 800 and 25g water (soil ratio 1: 2) again.Make the cylindrical standard specimen of Φ 50mm * 50mm, measure the green compression strength of sample with SQY hydraulic pressure strength testing machine; Make the wet special-purpose sample that draws, measure the green tensile strength and the hot green tensile strength of sample with the SLR hot wet tensile strength tester; Measure the water content of molding sand with the infrared baker of SGH double plate.
In the various embodiments described above, used quartz sand is 100/200 purpose quartz sand; Used refractory fibre is alumina silicate or alumina short fibre, its fibre diameter＜5.0 μ m, fibre length＜3mm.
The test result of the various embodiments described above is shown in the table 1.
Table 1
| Moulding-sand property | Green compression strength kPa | Green tensile strength kPa | Hot green tensile strength kPa | Water content (%) |
| Embodiment 1 | 118 | 15.5 | 3.5 | 3.25 |
| Embodiment 2 | 96 | 12.5 | 3.4 | 2.74 |
| Embodiment 3 | 92 | 11.5 | 3.0 | 3.76 |
| Embodiment 4 | 71 | 9.0 | 2.9 | 2.62 |
| Embodiment 5 | 63 | 7.5 | 2.6 | 3.24 |
| Embodiment 6 | 48 | 6.5 | 1.8 | 2.80 |
According to test data as can be seen, after adopting green-sand technology of the present invention, when the molding sand water content is low, the strength character of molding sand has obtained tangible improvement than prior art, has excellent comprehensive performances, can be used as the facing sand moulding, thereby make cast(ing) surface obtain clear, the well-bedded copper alloy embossing pattern of decorative pattern.
Claims (4)
1. green-sand for copper alloy relief decorative panel, it is characterized in that: form by roughing sand, bentonite, refractory fibre, water soluble polymer and water, wherein the bentonite addition is 5%～10% of a roughing sand quality, the refractory fibre addition is 0.10%～0.25% of a roughing sand quality, the water soluble polymer addition is 0.1%～0.5% of a roughing sand quality, and the addition of water was pressed soil ratio (mass parts) 1: 2～1: 3.
2. according to green-sand for copper alloy relief decorative panel as claimed in claim 1, it is characterized in that: described roughing sand is 100/200 order quartz sand; Bentonite is the casting sodium bentonite; Refractory fibre is alumina silicate or alumina short fibre, fibre diameter＜5.0 μ m, fibre length＜3mm; Water soluble polymer is low molecular poly or Sodium Polyacrylate, and wherein the relative molecular mass of polyethylene glycol is 200～800, and the relative molecular mass of Sodium Polyacrylate is 1000～1500.
3. the preparation technology of an above-mentioned green-sand for copper alloy relief decorative panel,
Take by weighing roughing sand, bentonite, refractory fibre, water soluble polymer and water in the mentioned component ratio;
With roughing sand, bentonite and refractory fibre add in simpson mill or the rotator mixed sand machine dried be mixed even;
Shake out after adding the mixed liquor wet mixing evenly of water soluble polymer and water again.
4. the preparation technology of green-sand for copper alloy relief decorative panel according to claim 3 is characterized in that:
Roughing sand, bentonite and refractory fibre are added the dried 2～10min of mixing in simpson mill or the rotator mixed sand machine;
Shake out after adding the mixed liquor wet mixing 15～25min of water soluble polymer and water again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810204044A CN101433941B (en) | 2008-12-04 | 2008-12-04 | Green-sand for copper alloy relief decorative panel and preparation technique thereof |
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| CN200810204044A CN101433941B (en) | 2008-12-04 | 2008-12-04 | Green-sand for copper alloy relief decorative panel and preparation technique thereof |
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| CN101433941A true CN101433941A (en) | 2009-05-20 |
| CN101433941B CN101433941B (en) | 2012-10-10 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103100638A (en) * | 2012-12-10 | 2013-05-15 | 马鞍山市万鑫铸造有限公司 | Method for manufacturing casting sand by doping with quartz powder |
| CN103567370A (en) * | 2012-07-23 | 2014-02-12 | 旭技术株式会社 | Production method of sand core and sand core |
| CN103586397A (en) * | 2013-11-27 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Casting sand for casting stainless steel end enclosure |
| CN104439040A (en) * | 2014-12-01 | 2015-03-25 | 昌利锻造有限公司 | Molding sand applied to copper alloy castings and preparation method of molding sand |
| CN105945208A (en) * | 2016-07-18 | 2016-09-21 | 四川安岳宇良汽车水泵有限公司 | Moulding sand production process for semi-closed water pump impeller |
| CN106001386A (en) * | 2016-05-26 | 2016-10-12 | 合肥市田源精铸有限公司 | Ductile iron crankshaft molding sand and preparation method thereof |
-
2008
- 2008-12-04 CN CN200810204044A patent/CN101433941B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103567370A (en) * | 2012-07-23 | 2014-02-12 | 旭技术株式会社 | Production method of sand core and sand core |
| CN103100638A (en) * | 2012-12-10 | 2013-05-15 | 马鞍山市万鑫铸造有限公司 | Method for manufacturing casting sand by doping with quartz powder |
| CN103100638B (en) * | 2012-12-10 | 2015-11-25 | 马鞍山市万鑫铸造有限公司 | A kind of method of the silica flour casting sand that adulterates |
| CN103586397A (en) * | 2013-11-27 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Casting sand for casting stainless steel end enclosure |
| CN104439040A (en) * | 2014-12-01 | 2015-03-25 | 昌利锻造有限公司 | Molding sand applied to copper alloy castings and preparation method of molding sand |
| CN106001386A (en) * | 2016-05-26 | 2016-10-12 | 合肥市田源精铸有限公司 | Ductile iron crankshaft molding sand and preparation method thereof |
| CN105945208A (en) * | 2016-07-18 | 2016-09-21 | 四川安岳宇良汽车水泵有限公司 | Moulding sand production process for semi-closed water pump impeller |
| CN105945208B (en) * | 2016-07-18 | 2018-01-02 | 四川安岳宇良汽车水泵有限公司 | Semi-closed type water pump impeller sand conditioning technique |
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Effective date of registration: 20181220 Address after: East Workshop No. 2655 Fujin Road, Baoshan District, Shanghai, 2010 Patentee after: Xin Technology (Shanghai) Material Technology Co., Ltd. Address before: No. 960 Zhongxing Road, Zhabei District, Shanghai 200070 Patentee before: Shanghai Institute of Machine Building Technology Co., Ltd. |
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