CN1070744C - Mould material for investment casting and mould forming method - Google Patents
Mould material for investment casting and mould forming method Download PDFInfo
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- CN1070744C CN1070744C CN99100268A CN99100268A CN1070744C CN 1070744 C CN1070744 C CN 1070744C CN 99100268 A CN99100268 A CN 99100268A CN 99100268 A CN99100268 A CN 99100268A CN 1070744 C CN1070744 C CN 1070744C
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Abstract
The present invention belongs to the field of metal casting. A casting mould material for investment casting of the present invention comprises chemical components (weight percent) of 50 to 80% of fire-resistant material, 1 to 5% of soluble inorganics or organics and 19 to 45% of water. The forming method for the investment casting mould comprises the steps of proportioning, pulping, pulp vibration, vacuumization, air elimination, pulp perfusion into a mould box, the revibration of the mould box with pulp, vacuumization, air elimination and pulp solidification. The present invention can eliminate the gas in the casting mould, improve the quality of cast products and cast high melting metal and noble metal cast products, etc. Besides, the present invention has no pollution.
Description
The invention belongs to field of metal casting technology.Be applicable to the casting of the metal that makes preparations for sowing, be specially adapted to the hot investment casting of refractory metal and gold, silver jewellery etc.
Ornament manufactures such as metal jewelries such as gold, silver, platinum and other smithcraft artistic products, usually adopt hot investment casting industry, the requirement strand not only has the good duplicating to design, and requires casting back sand removal easy, and surface quality of continuous castings is bright and clean.For this reason, mold material not only will have certain mechanical strength, but also good moulding by casting will be arranged, collapsibility and crack resistance etc.
At present, multilayer shell casting mold is mainly still adopted in model casting in the prior art, and a small amount of plaster molding for investment casting is also arranged.
Publication number is the Chinese patent application of CN1049619A, and a kind of process for casting of aluminium alloy by gypsum type rotary mould is provided.In this manufacturing process, the strand that is adopted is a gypsum mould, and its concrete chemical composition is: αBan Shuishigao 34-53.5%, silica flour 35-45%, talcum powder 1-5%, calcium carbonate 0.5-1%, organic matter 10-15% adds the 45-55% that water weight is the above-mentioned material gross weight.This gypsum mould casting mold powder only is applicable to the Birmasil mould, can not be suitable for the smart casting of fusible pattern plaster mold of noble metals such as refractory metal and gold, silver jewellery.Because this gypsum mould casting mold is after high-temperature roasting (600-750 ℃), shrinkage is big, and is easy to generate internal fissure.Cast cleaning difficulty in addition, promptly collapsibility is poor.
The object of the present invention is to provide a kind of the model casting mold material and casting mold forming technology such as noble metal hot investment castings such as refractory metal and gold, silver jewellery that can be applicable to the moulding complexity.
At above-mentioned purpose, mold material of the present invention is based on refractory material, and joins and meltability inorganic matter or organic matter; Its casting mold moulding process vibrates slurry and to vacuumize degasification except that adopting general casting technique, then slurry perfusion in the moulding box of special use, the moulding box behind the perfusion slurry vibrated again vacuumize degasification, improve casting quality.
Concrete technical scheme is as follows:
The concrete chemical composition (weight %) of model casting mold material of the present invention is: refractory material 50-80%, meltability inorganic matter or organic matter 1-5%, water 19-45%.
Wherein refractory material is Al
2O
3, SiO
2, among the MgO, mullite, SiC, SiN more than any.
The solubility inorganic matter is in barium hydroxide, sodium chloride, sodium phosphate, calcium monohydrogen phosphate, aluminum phosphate, potash, sodium carbonate, sodium aluminate, the magnesium sulfate more than any.
Dissolved organic matter is in polyvinyl alcohol, starch, dextrin, cellulose, the alginate more than any.
The granularity of refractory material≤200 μ m.
For in above-mentioned chemical composition, refractory material is the basis of casting mold structure, it makes casting mold have enough normal temperature and elevated temperature strength, at high temperature indeformable, and air permeability and good, the heat characteristics such as stability, thermo-chemical stability and shelling of shaking are arranged, guarantee the casting mold good quality and have good casting technique performance.
Dissolved organic matter or inorganic matter make casting mold have suitable comprehensive strength and mold cavity surface bright and clean; Make casting mold also have enough hardness simultaneously, make it antiscour; In addition, make casting mold when casting, not produce pernicious gas; It is defeated and dispersed that casting back casting mold can be met water, easy-clear, and also after defeated and dispersed, mold material can reclaim, use with simple and easy method.
Model casting casting mold manufacturing process of the present invention comprises following processing step:
(1) batching
At first prepare burden by the chemical composition scope of model casting mold material of the present invention.
(2) making beating
Confected materials is put into special container, carry out craft or machinery making beating then, be about to raw material and fully mix, dissolve each other evenly, become slurry with certain flowability.
(3) the slurry vibration vacuumizes degasification
Prepared slurry is put into vibrating device with vacuum-pumping, under vibration condition, vacuumize degasification,, improve the casting mold quality the gas clean-up in the slurry.Its vibration frequency is 1-50 time/second, and the vacuum in the vibrating device is 0.03-0.1MPa, and time of vibration is 5-15 minute;
(4) perfusion moulding box
To go in the moulding box of being prepared on demand in advance through vibration and vacuum degassed slurry perfusion.
(5) the moulding box vibration vacuumizes degasification
The moulding box that injects slurry is put into the vibrating device of vacuum-pumping, moulding box is vibrated and vacuum degassing, the one, make the slurry in the moulding box more closely knit, the one, continue to remove the gas in the slurry, particularly eliminate the gas of in filling process, bringing into.Its vibration frequency is 1-50 time/second, and vacuum is 0.03-0.1MP in the vibrating device, and time of vibration is 2-7 minute.
(6) slurry curing
The moulding box of band slurry at room temperature carries out slurry curing after vibration and vacuum degassing, be 0.5-8 hour hardening time.
After the curing, casting mold can use.Behind the casting-up metal, but the quick-fried sand shelling of water logging (molten).
The present invention compared with prior art has following advantage:
(1) since casting mold of the present invention in process of production, the moulding box of its slurry and perfusion slurry all carries out vacuum degassing under vibration condition, substantially removed the gas in slurry and the casting mold, so just can eliminate because metal knurl and the gas hole defect in the foundry goods that casting mold gas is caused improves casting quality greatly.
(2) not only economy but also realize the production of complicated shape foundry goods such as refractory metal easily.
(3) be easy to remove mold material after the casting, pollution-free.
(4) mold material can reclaim, and reusable, greatly reduces the cost of foundry goods.
Embodiment
According to model casting mold material of the present invention and casting mold manufacturing process, four batches of casting molds have been prepared.At first according to the chemical composition of mold material, be equipped with four batches of mold materials, the concrete chemical composition of four batches of mold materials is as shown in table 1.After the batching, carry out the machinery making beating in batches, four batches of slurries are vibrated and vacuum degassing then in batches, then four batches of slurries are fed into four kinds of moulding boxs, and moulding box is vibrated and vacuum degassing in batches.The vibration and the vacuum degassing parameter of the moulding box of slurry and perfusion slurry are as shown in table 2.Be cured subsequently, cure parameter is also listed table 2 in.
Casting mold after four batches of curing has been carried out normal temperature and high temperature break resistant intensity test, and result of the test is listed table 3 in.In addition, utilize four batches of casting molds to carry out the cast of four kinds of metallic elements, and foundry goods has been carried out quality inspection.Assay, casting quality is good.
The chemical composition (weight %) of table 1 embodiment mold material
Table 2 embodiment slurry and moulding box vibration and vacuum degassing parameter
The metal and the foundry goods kind of being poured into a mould in normal temperature, elevated temperature strength and the casting mold of table 3 embodiment gained casting mold
Claims (6)
1, a kind of model casting mold material is characterized in that chemical composition (weight %) is: refractory aggregate 50-80%, solubility inorganic matter or organic matter 1-5%, water 19-45%.
2, mold material according to claim 1 is characterized in that refractory material is Al
2O
3, SiO
2, among the MgO, mullite, SiC, SiN more than any.
3, mold material according to claim 1 is characterized in that inorganic matter is in barium hydroxide, sodium chloride, sodium phosphate, calcium monohydrogen phosphate, aluminum phosphate, potash, sodium carbonate, sodium aluminate, the magnesium sulfate more than any.
4, mold material according to claim 1 is characterized in that organic matter is in polyvinyl alcohol, starch, dextrin, cellulose, the alginate more than any.
5, material according to claim 1 and 2 is characterized in that the granularity of refractory aggregate is≤200 μ m.
6, a kind of model casting casting mold manufacturing process comprises batching, making beating, perfusion moulding box and slurry curing, it is characterized in that this method also comprises:
(1) the slurry vibration vacuumizes degasification
Batching is after making beating, and slurry is put into the vibrating device of vacuum-pumping, vacuumizes degasification under vibration condition, and its vibration frequency is 1-50 time/second, and vacuum is 0.03-0.1MPa in the vibrating device, and time of vibration is 5-15 minute;
(2) the moulding box vibration vacuumizes degasification
To go in the moulding box of being prepared on demand in advance through vibration and vacuum degassed slurry perfusion, then moulding box is put into the vibrating device of vacuum-pumping, moulding box is vibrated and vacuumizes degasification, vibration frequency is 1-50 time/second, vacuum is 0.03-0.1MPa in the vibrating device, and time of vibration is 2-7 minute;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99100268A CN1070744C (en) | 1999-01-27 | 1999-01-27 | Mould material for investment casting and mould forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99100268A CN1070744C (en) | 1999-01-27 | 1999-01-27 | Mould material for investment casting and mould forming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1223913A CN1223913A (en) | 1999-07-28 |
| CN1070744C true CN1070744C (en) | 2001-09-12 |
Family
ID=5269902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99100268A Expired - Fee Related CN1070744C (en) | 1999-01-27 | 1999-01-27 | Mould material for investment casting and mould forming method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1070744C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101195538B (en) * | 2007-12-13 | 2010-04-14 | 武汉钢铁(集团)公司 | Silicon carbide ceramic abrasion-proof structure and manufacturing method thereof |
| CN102489046A (en) * | 2011-12-09 | 2012-06-13 | 神华集团有限责任公司 | Pre-processing method for slurry for catalyst spray forming and degassing system thereof |
| CN102701755A (en) * | 2012-05-03 | 2012-10-03 | 牛文杰 | Precise ceramic inner lining element |
| CN103350446A (en) * | 2013-08-01 | 2013-10-16 | 三门峡阳光铸材有限公司 | Method for preparing fiber pouring cup for casting |
| CN105777114A (en) * | 2016-03-02 | 2016-07-20 | 江苏金汇精铸陶瓷股份有限公司 | Preparation method of water-soluble ceramic core |
| CN105964889A (en) * | 2016-06-22 | 2016-09-28 | 马鞍山市创诚铸造有限公司 | Environmentally-friendly moulding sand using lithium-based bentonite modified gelatin as adhesive and preparation method thereof |
| CN107706303A (en) * | 2017-09-26 | 2018-02-16 | 武汉大学 | Prepare the vibration vacuum pumping method of cement base piezoelectric composite material |
| CN110112529B (en) * | 2019-06-06 | 2022-03-08 | 中国电子科技集团公司第二十九研究所 | Integrated integral manufacturing method for multi-port millimeter wave bent rectangular waveguide array body |
| CN112122545B (en) * | 2020-08-13 | 2022-05-03 | 佛山市恒之芯复合材料有限公司 | Preparation method of reusable investment casting shell, shell and casting process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049619A (en) * | 1990-07-21 | 1991-03-06 | 山东省家用电器研究所 | Process for casting of aluminium alloy by gypsum type rotary mould |
| CN1089195A (en) * | 1992-09-21 | 1994-07-13 | 克洛德·瓦特斯 | investment casting refractory material |
-
1999
- 1999-01-27 CN CN99100268A patent/CN1070744C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049619A (en) * | 1990-07-21 | 1991-03-06 | 山东省家用电器研究所 | Process for casting of aluminium alloy by gypsum type rotary mould |
| CN1089195A (en) * | 1992-09-21 | 1994-07-13 | 克洛德·瓦特斯 | investment casting refractory material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1223913A (en) | 1999-07-28 |
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