CN1539571A - Method for preparing porous gypsum mold - Google Patents
Method for preparing porous gypsum mold Download PDFInfo
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- CN1539571A CN1539571A CNA2003101083018A CN200310108301A CN1539571A CN 1539571 A CN1539571 A CN 1539571A CN A2003101083018 A CNA2003101083018 A CN A2003101083018A CN 200310108301 A CN200310108301 A CN 200310108301A CN 1539571 A CN1539571 A CN 1539571A
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Abstract
A process for preparing the porous casting gypsum model includes proportionally mxing gypsum powder, solidifying agent, toughening short fibres and water to obtain slurry, pouring in metal mould while vibrating for removing air, solidifying, and baking for dewaxing.
Description
Technical field
The present invention relates to a kind of preparation method of gypsum mould, particularly a kind ofly be used for the preparation method that electromagnetic separation prepares the graphite casting mold of in-situ graded composite.Belong to the Composite Preparation field.
Background technology
In recent years, various electromagnetism phase detachment techniques have obtained broad research in the application aspect preparation gradient/composite surface material, its essence is and utilize the difference between looks and alloy liquid electrical conductivity in the alloy liquid, extra electric field, magnetic field (or both combinations) back have just formed the gradient self-generating/composite surface material of surface enrichment from the looks particle to producing electromagnetic force from looks and making it to the migration of alloy liquid superficial layer after alloy liquid solidifies in casting mold.
The existing electromagnetism phase detachment technique that utilizes prepares in the in-situ graded composite, is mostly to adopt the single hole separator.Find by literature search, " microstructure and property of hypereutectic al-si in-situ graded composite " (" China YouSe Acta Metallurgica Sinica " that people such as Li Ke deliver, 2002,12 (3): pp.521-524), this article introduction employing adds coil-induced alternating magnetic field mode cylindric melt is applied alternating magnetic field, the electromagnetic force that produces can make spontaneous skew wherein poly-to the melt outer surface, and by selecting suitable electromagnetic force operational factors, thereby pole shape and tubulose gradient composites that primary silicon strengthens outer surface have mutually been prepared, owing to adopt the single hole separator, at every turn can only moulding one, efficient is lower.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art and defective, a kind of preparation method of graphite casting mold is proposed, make it be used for electromagnetic separation and prepare in-situ graded composite, adopt this casting mold to inject alloy liquid, apply alternating magnetic field by external coil, utilize alloy liquid and the conductivity difference between looks, make the less spontaneous skew of conductance poly-to the matrix material outer surface, thereby making spontaneous wild phase size and volume fraction all radially be continuous gradient distributes, alloy liquid just can obtain high surface hardness and wearability after solidifying in the graphite cast, and can keep the gradient of center toughness to strengthen composite bar.
The present invention is achieved by the following technical solutions, the inventive method is as follows: adopt graphite type mould moulding graphite casting mold, add water after land plaster, curing agent and toughness reinforcing short fiber fully mixed in proportion and be deployed into slurry, inject the die cavity of metal pattern from graphite type mould top, in the simple vacuum chamber, vibrate, after waiting to discharge the gas in the gypsum slurry, continue to replenish slurry and fill up die cavity, leave standstill subsequently, after treating that gypsum solidifies, dewaxing and oven dry promptly obtain the graphite casting mold in baking oven.
Below the inventive method is further described, concrete steps are as follows:
1. the percentage by weight by land plaster takes by weighing 1-10% resin curing agent and the toughness reinforcing short fiber of 1-30%, and all the other are the casting land plaster;
2. three kinds of materials being added batch mixers fully stirs and mixes;
3. with the some diameters of paraffin core mold moulding in advance the pole shape paraffin core of 3-50mm, be assembled into graphite type mould, pole shape paraffin core be fixed in the metal pattern die cavity between top cover and the base by the through hole on the top cover of this mould and the blind hole on the base;
4. well-mixed gypsum slurry is injected the die cavity of metal pattern from the sprue gate of graphite type mould top cover, till filling with;
5. graphite type mould integral body is vibrated 2-10 minute in the simple vacuum chamber, wait to discharge the gas in the gypsum slurry after, continue to replenish slurry and fill up die cavity;
6. after leaving standstill 6-8 hour, with the gypsum mould demoulding of solidifying;
7. the graphite casting mold that will have pole shape paraffin core dewaxes in 300-600 ℃ baking oven;
8. continue oven dry 8-12 hour, obtain the graphite casting mold.
The graphite casting mold of the present invention's preparation has cylindrical exterior, wherein be evenly distributed with the circular hole of a plurality of axial perforations, and wall thickness is consistent everywhere.The external diameter up 300mm of graphite casting mold, according to the needs of preparation bar length and diameter, the diameter of graphite casting mold inner circular aperture is chosen in the scope of 3-50mm, and the length of graphite casting mold is chosen in the scope of 30-300mm.
The graphite casting mold of the present invention preparation is applicable to that electromagnetic separation prepares the cast of pole in-situ graded composite, can convenient for assembly and dismounting in the electromagnetism separator; The pole shape gradient self-generating reinforced composite that the graphite cast that adopts this method to make prepares, outer surface form that gradient radially distributes, have certain thickness high rigidity from the looks enhancement layer, surface layer abrasion-proof is better than the composite of body homogeneous, and center matrix is an eutectic structure, has guaranteed overall flexibility; The graphite casting mold that this method makes is less demanding to manufacturing equipment, technological process is few, cost is low, adopts short fiber to strengthen the gypsum material manufacturing, has both guaranteed enough intensity, has collapsibility preferably again, recyclable utilization.
The specific embodiment
Content in conjunction with the inventive method provides following examples:
Embodiment 1
The manufacturing external diameter is that 50mm, length are the graphite casting mold of 30mm, and its inside diameter is that the quantity of 3mm circular hole is 61.Concrete steps are as follows:
1. the percentage by weight by land plaster takes by weighing resin curing agent 1% and toughness reinforcing short fiber 1%, and all the other are the casting land plaster;
2. three kinds of materials being added batch mixers fully stirs and mixes;
With paraffin core mold in advance forming diameter be the pole shape paraffin core of 3mm, be assembled into graphite type mould, pole shape paraffin core be fixed in the metal pattern die cavity between top cover and the base by the through hole on the top cover of this mould and the blind hole on the base;
4. well-mixed gypsum slurry is injected the die cavity of metal pattern from the sprue gate of graphite type mould top cover, till filling with;
5. graphite type mould integral body is vibrated 2 minutes in the simple vacuum chamber, wait to discharge the gas in the gypsum slurry after, continue to replenish slurry and fill up die cavity;
6. after leaving standstill 6 hours, with the gypsum mould demoulding of solidifying;
7. the graphite casting mold that will have pole shape paraffin core dewaxes in 300 ℃ baking oven;
8. continue oven dry 8 hours, obtaining internal diameter is the 61 hole graphite casting molds of 3mm.
Implementation result: the graphite casting mold of preparation has cylindrical exterior, and nearly 61 circular holes that axially connect that wherein evenly distribute can guarantee wall thickness unanimity everywhere.The external diameter of graphite casting mold is 50mm, and length is 30mm, is applicable to that electromagnetic separation prepares the cast of pole in-situ graded composite, can convenient for assembly and dismounting in the electromagnetism separator.Adopting the preparation of this graphite cast can obtain diameter is that 3mm, length are the pole shape gradient self-generating reinforced composite of 30mm, outer surface form that gradient radially distributes, have certain thickness high rigidity from the looks enhancement layer, surface layer abrasion-proof is better than the composite of body homogeneous, and center matrix is an eutectic structure, has guaranteed overall flexibility.
Embodiment 2
The manufacturing external diameter is that 150mm, length are the graphite casting mold of 150mm, and its inside diameter is that the quantity of 20mm circular hole is 19.Concrete steps are as follows:
1. the percentage by weight by land plaster takes by weighing resin curing agent 5% and toughness reinforcing short fiber 15%, and all the other are the casting land plaster;
2. three kinds of materials being added batch mixers fully stirs and mixes;
3. the pole shape paraffin core that is 20mm with 19 diameters of paraffin core mold moulding in advance, be assembled into graphite type mould, pole shape paraffin core be fixed in the metal pattern die cavity between top cover and the base by the through hole on the top cover of this mould and the blind hole on the base;
4. well-mixed gypsum slurry is injected the die cavity of metal pattern from the sprue gate of graphite type mould top cover, till filling with;
5. graphite type mould integral body is vibrated 5 minutes in the simple vacuum chamber, wait to discharge the gas in the gypsum slurry after, continue to replenish slurry and fill up die cavity;
6. after leaving standstill 7 hours, with the gypsum mould demoulding of solidifying;
7. the graphite casting mold that will have pole shape paraffin core dewaxes in 450 ℃ baking oven;
8. continue oven dry 10 hours, obtaining internal diameter is the 19 hole graphite casting molds of 20mm.
Implementation result: the graphite casting mold of preparation has cylindrical exterior, and nearly 19 circular holes that axially connect that wherein evenly distribute can guarantee wall thickness unanimity everywhere.The external diameter of graphite casting mold is 150mm, and length is 150mm, is applicable to that electromagnetic separation prepares the cast of pole in-situ graded composite, can convenient for assembly and dismounting in the electromagnetism separator.Adopting the preparation of this graphite cast can obtain diameter is that 20mm, length are the pole shape gradient self-generating reinforced composite of 150mm, outer surface form that gradient radially distributes, have certain thickness high rigidity from the looks enhancement layer, surface layer abrasion-proof is better than the composite of body homogeneous, and center matrix is an eutectic structure, has guaranteed overall flexibility.
Embodiment 3
The manufacturing external diameter is that 300mm, length are the graphite casting mold of 300mm, and its inside diameter is that the quantity of 50mm circular hole is 19.Concrete steps are as follows:
1. the percentage by weight by land plaster takes by weighing resin curing agent 10% and toughness reinforcing short fiber 30%, and all the other are the casting land plaster;
2. three kinds of materials being added batch mixers fully stirs and mixes;
3. the pole shape paraffin core that is 50mm with 19 diameters of paraffin core mold moulding in advance, be assembled into graphite type mould, pole shape paraffin core be fixed in the metal pattern die cavity between top cover and the base by the through hole on the top cover of this mould and the blind hole on the base;
4. well-mixed gypsum slurry is injected the die cavity of metal pattern from the sprue gate of graphite type mould top cover, till filling with;
5. graphite type mould integral body is vibrated 10 minutes in the simple vacuum chamber, wait to discharge the gas in the gypsum slurry after, continue to replenish slurry and fill up die cavity;
6. after leaving standstill 8 hours, with the gypsum mould demoulding of solidifying;
7. the graphite casting mold that will have pole shape paraffin core dewaxes in 600 ℃ baking oven;
8. continue oven dry 12 hours, obtaining internal diameter is the 19 hole graphite casting molds of 50mm.
Implementation result: the graphite casting mold of preparation has cylindrical exterior, and nearly 19 circular holes that axially connect that wherein evenly distribute can guarantee wall thickness unanimity everywhere.The external diameter of graphite casting mold is 3000mm, and length is 300mm, is applicable to that electromagnetic separation prepares the cast of pole in-situ graded composite, can convenient for assembly and dismounting in the electromagnetism separator.Adopting the preparation of this graphite cast can obtain diameter is that 50mm, length are the pole shape gradient self-generating reinforced composite of 300mm, outer surface form that gradient radially distributes, have certain thickness high rigidity from the looks enhancement layer, surface layer abrasion-proof is better than the composite of body homogeneous, and center matrix is an eutectic structure, has guaranteed overall flexibility.
Claims (4)
1, a kind of preparation method of graphite casting mold, it is characterized in that, method is as follows: adopt graphite type mould moulding graphite casting mold, add water after land plaster, curing agent and toughness reinforcing short fiber fully mixed in proportion and be deployed into slurry, inject the die cavity of metal pattern from graphite type mould top, in the simple vacuum chamber, vibrate, after waiting to discharge the gas in the gypsum slurry, continue to replenish slurry and fill up die cavity, leave standstill subsequently, after treating that gypsum solidifies, dewaxing and oven dry promptly obtain the graphite casting mold in baking oven.
2, the preparation method of graphite casting mold according to claim 1 is characterized in that, below the inventive method is further described, and concrete steps are as follows:
(1) percentage by weight by land plaster takes by weighing 1-10% resin curing agent and the toughness reinforcing short fiber of 1-30%, and all the other are the casting land plaster;
(2) three kinds of materials being added batch mixers fully stirs and mixes;
(3) the percentage by weight adding compound of pressing 5-50% continues to stir and mix;
(4) with the some diameters of paraffin core mold moulding in advance be the pole shape paraffin core of 3-50mm, be assembled into graphite type mould, pole shape paraffin core be fixed in the metal pattern die cavity between top cover and the base by the through hole on the top cover of this mould and the blind hole on the base;
(5) with the die cavity of well-mixed gypsum slurry, till filling with from the sprue gate injection metal pattern of graphite type mould top cover;
(6) graphite type mould integral body is vibrated 2-10 minute in the simple vacuum chamber, wait to discharge the gas in the gypsum slurry after, continue to replenish slurry and fill up die cavity;
(7) leave standstill 6-8 hour after, with the gypsum mould demoulding of solidifying;
(8) the graphite casting mold that will have a pole shape paraffin core dewaxes in 300-600 ℃ baking oven;
(9) continue oven dry 8-12 hour, obtain the graphite casting mold.
3, the preparation method of graphite casting mold according to claim 1 and 2 is characterized in that, the graphite casting mold of preparation has cylindrical exterior, wherein is evenly distributed with the circular hole of a plurality of axial perforations, and wall thickness is consistent everywhere.
4, the preparation method of graphite casting mold according to claim 1 and 2, it is characterized in that, the external diameter up 300mm of the graphite casting mold of preparation, the diameter of graphite casting mold inner circular aperture is chosen in the scope of 3-50mm, and the length of graphite casting mold is chosen in the scope of 30-300mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101083018A CN1539571A (en) | 2003-10-30 | 2003-10-30 | Method for preparing porous gypsum mold |
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| CNA2003101083018A CN1539571A (en) | 2003-10-30 | 2003-10-30 | Method for preparing porous gypsum mold |
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| CN1539571A true CN1539571A (en) | 2004-10-27 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101204827B (en) * | 2007-12-14 | 2010-06-16 | 哈尔滨工业大学 | Preparation method of micro-welding mould quick used plaster casting mold |
| CN101439390B (en) * | 2008-12-30 | 2011-03-16 | 机械科学研究总院先进制造技术研究中心 | Digitalization processing method of gypsum mould |
| CN102248123A (en) * | 2011-06-07 | 2011-11-23 | 昆山市瑞捷精密模具有限公司 | Method for forming gypsum mold |
| CN102584157A (en) * | 2012-02-01 | 2012-07-18 | 大同北方天力增压技术有限公司 | Gypsum casting material used for casting impellers of air compressor of turbocharger |
| CN104350024A (en) * | 2012-05-30 | 2015-02-11 | 圣戈班普拉科公司 | Gypsum composition for refractory moulds |
| CN104493107A (en) * | 2014-12-29 | 2015-04-08 | 无锡蕾菲赛尔机械科技有限公司 | Angle box for mold manufacturing |
| CN106493292A (en) * | 2016-10-18 | 2017-03-15 | 无锡蕾菲赛尔机械科技有限公司 | A kind of tire aluminium alloy casting mould gypsum mould and preparation method thereof |
| CN108723295A (en) * | 2018-05-23 | 2018-11-02 | 内蒙古工业大学 | The method of fiber reinforcement gypsum investment shell intensity |
| CN114247849A (en) * | 2021-11-15 | 2022-03-29 | 苏州美迈快速制造技术有限公司 | Lattice mechanism gypsum forming process |
-
2003
- 2003-10-30 CN CNA2003101083018A patent/CN1539571A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101204827B (en) * | 2007-12-14 | 2010-06-16 | 哈尔滨工业大学 | Preparation method of micro-welding mould quick used plaster casting mold |
| CN101439390B (en) * | 2008-12-30 | 2011-03-16 | 机械科学研究总院先进制造技术研究中心 | Digitalization processing method of gypsum mould |
| CN102248123A (en) * | 2011-06-07 | 2011-11-23 | 昆山市瑞捷精密模具有限公司 | Method for forming gypsum mold |
| CN102584157A (en) * | 2012-02-01 | 2012-07-18 | 大同北方天力增压技术有限公司 | Gypsum casting material used for casting impellers of air compressor of turbocharger |
| CN104350024A (en) * | 2012-05-30 | 2015-02-11 | 圣戈班普拉科公司 | Gypsum composition for refractory moulds |
| CN104493107A (en) * | 2014-12-29 | 2015-04-08 | 无锡蕾菲赛尔机械科技有限公司 | Angle box for mold manufacturing |
| CN104493107B (en) * | 2014-12-29 | 2016-08-31 | 无锡蕾菲赛尔机械科技有限公司 | A kind of angle case for Making mold |
| CN106493292A (en) * | 2016-10-18 | 2017-03-15 | 无锡蕾菲赛尔机械科技有限公司 | A kind of tire aluminium alloy casting mould gypsum mould and preparation method thereof |
| CN108723295A (en) * | 2018-05-23 | 2018-11-02 | 内蒙古工业大学 | The method of fiber reinforcement gypsum investment shell intensity |
| CN108723295B (en) * | 2018-05-23 | 2019-09-06 | 内蒙古工业大学 | The method of fiber reinforcement gypsum investment shell intensity |
| CN114247849A (en) * | 2021-11-15 | 2022-03-29 | 苏州美迈快速制造技术有限公司 | Lattice mechanism gypsum forming process |
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