CN1104942A - Magnesium alloy gypsum type melting mould founding technology - Google Patents
Magnesium alloy gypsum type melting mould founding technology Download PDFInfo
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- CN1104942A CN1104942A CN 94100853 CN94100853A CN1104942A CN 1104942 A CN1104942 A CN 1104942A CN 94100853 CN94100853 CN 94100853 CN 94100853 A CN94100853 A CN 94100853A CN 1104942 A CN1104942 A CN 1104942A
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- magnesium alloy
- gypsum
- mould
- flame retardant
- type melting
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Abstract
On the basis of ordinary plaster molding investment cast technology, the invented technology adds 0.01-10% of anti-burning agent in the base powdery material for making the plaster molding, or when pouring the magnesium alloy, the CO2 protective gases are passed over for antiburning while the antiburning agent is added. Said technology can effectively prevent burning while casting the magnesium alloy and features toxicless and economical.
Description
The present invention relates to casting technique, particularly a kind of magnesium alloy fusible pattern casting process.
For a long time, magnesium alloy cast mainly adopts sand mold, on a small quantity with die casting and metal mold production, is used for magnesium alloy as the model casting of one of main casting technique, yet there are no report in the document at home and abroad.Simultaneously; there is important anti-flaming problem in magnesium alloy cast; the public type of foreign patent US4579166A, SU778906A in the magnesium alloy plaster casting, be pressed into the sulfur hexafluoride gas protection or in the low pressure casting type method of the anti-flaming frangible layer of coating prevent burning and cracking.But concerning magnesium alloy investment casting, because invested mould poor thermal conductivity, being heated higher temperature again pours into a mould, so it is simple that anti-flaming measure does not resemble die casting and the permanent mold casting, and directly adopt the flame retardant of sand casting, can reduce mold cavity surface quality and other performances again, so magnesium alloy investment casting is anti-flaming, be the key issue that waits to solve always.
The objective of the invention is to solve the anti-flaming problem of magnesium alloy in model casting, thereby a kind of practical and effective magnesium alloy gypsum type melting mould founding technology is provided.
The object of the present invention is achieved like this:
A kind of magnesium alloy gypsum type melting mould founding technology, comprise conventional investment casting process, be fusible pattern preparation, gypsum mould making, alloy melting and cast, its difference is to add flame retardant in the basic powder of making gypsum mould, and the deal of flame retardant can be 0.01～10% of basic powder weight.Described flame retardant can be boric acid or sodium alkyl sulfonate or its both combinations.
Realizing the another kind of approach of above-mentioned purpose, is to add in above-mentioned investment casting process on the basis of flame retardant, when the cast magnesium alloy, casting mold is placed closed container, feeds anti-flaming protective gas and carries out anti-flaming.This protective gas can be CO
2Gas.
The present invention can effectively solve the anti-flaming problem of magnesium alloy when model casting, and compares with making technique with external anti-combustion technology, has characteristics such as nontoxic, economic, suitable Chinese market supply condition and resources advantage.Through evidence, cast(ing) surface does not have burn pattern, and surface roughness is good, dimensional accuracy reaches the CT3-CT4 requirement in the Chinese navigation mark HB6103-86 standard.
Below in conjunction with embodiment the present invention is elaborated
Embodiment 1: make the magnesium alloy investment-casting with gypsum as the main material of casting mold, the concrete composition of casting mold is:
Basis powder: gypsum 55%(percentage by weight)
Silica flour 45%(percentage by weight)
The flame retardant that adds has: 6% of the quite basic powder weight of boric acid;
4% of the quite basic powder weight of sodium alkyl sulfonate;
Water is in harmonious proportion during making, and investment casting process carries out fusible pattern making and cast routinely.
Embodiment 2: adopt another casting mold prescription of gypsum type melting mould founding to be:
Basis powder: gypsum 35%(percentage by weight)
Silica flour 35%(percentage by weight)
Talcum powder 30%(percentage by weight)
Additive has: glass fibre, its deal is equivalent to 0.2% of basic powder weight.
The flame retardant that adds has: sodium alkyl sulfonate, its deal is equivalent to 0.01% of basic powder weight.
Water is in harmonious proportion during making, and investment casting process carries out the fusible pattern making routinely, and when magnesium alloy pouring, casting mold is placed closed container, feeds CO
2Gas shield is anti-flaming.
Embodiment 3: the casting mold of gypsum type melting mould founding is made up of following prescription:
Basis powder: gypsum 30%(percentage by weight)
Mullite powder 70%(percentage by weight)
Additive has glass fibre, and its deal is equivalent to 1% of basic powder weight;
The flame retardant that adds has: boric acid, its deal is equivalent to 4.5% of basic powder weight.
Water is in harmonious proportion during making, and investment casting process carries out fusible pattern making and cast routinely.
Claims (5)
1, a kind of magnesium alloy gypsum type melting mould founding technology comprises the fusible pattern preparation, and gypsum mould making, alloy melting and cast is characterized in that: add flame retardant in the basic powder of making gypsum mould, the deal of flame retardant is the 0.01-10% of basic powder weight.
2, magnesium alloy gypsum type melting mould founding technology according to claim 1 is characterized in that described flame retardant is a kind of or the two combination in boric acid, the sodium alkyl sulfonate.
3, a kind of magnesium alloy gypsum type melting mould founding technology; comprise the fusible pattern preparation; gypsum mould is made; alloy melting and cast is characterized in that, add flame retardant in the basic powder of making gypsum mould; the deal of flame retardant is the 0.01-10% of basic powder weight; and when the cast magnesium alloy, casting mold is placed closed container, feed anti-flaming protective gas.
4, magnesium alloy gypsum type melting mould founding technology according to claim 3 is characterized in that described anti-flaming protection gas is CO
2Gas.
5, magnesium alloy gypsum type melting mould founding technology according to claim 3 is characterized in that described flame retardant is a kind of or the two combination in boric acid, the alkyl sulfonic acid steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94100853.3A CN1036446C (en) | 1994-01-03 | Magnesium alloy gypsum type melting mould founding technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94100853.3A CN1036446C (en) | 1994-01-03 | Magnesium alloy gypsum type melting mould founding technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1104942A true CN1104942A (en) | 1995-07-12 |
| CN1036446C CN1036446C (en) | 1997-11-19 |
Family
ID=
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106424534A (en) * | 2016-11-08 | 2017-02-22 | 上海航天精密机械研究所 | Mg-alloy casting sand |
| CN107838402A (en) * | 2017-11-16 | 2018-03-27 | 中国科学院长春应用化学研究所 | A kind of manufacture method of complicated magnesium alloy structural part |
| CN108723295A (en) * | 2018-05-23 | 2018-11-02 | 内蒙古工业大学 | The method of fiber reinforcement gypsum investment shell intensity |
| CN110893453A (en) * | 2019-12-02 | 2020-03-20 | 中北大学 | Gypsum mold precision casting method and device for magnesium alloy casting |
| CN118341946A (en) * | 2024-06-18 | 2024-07-16 | 成都新航工业科技股份有限公司 | Casting device and casting method for special-shaped part |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106424534A (en) * | 2016-11-08 | 2017-02-22 | 上海航天精密机械研究所 | Mg-alloy casting sand |
| CN107838402A (en) * | 2017-11-16 | 2018-03-27 | 中国科学院长春应用化学研究所 | A kind of manufacture method of complicated magnesium alloy structural part |
| 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 |
| CN110893453A (en) * | 2019-12-02 | 2020-03-20 | 中北大学 | Gypsum mold precision casting method and device for magnesium alloy casting |
| CN110893453B (en) * | 2019-12-02 | 2024-02-27 | 中北大学 | Gypsum type precision casting method and device for magnesium alloy castings |
| CN118341946A (en) * | 2024-06-18 | 2024-07-16 | 成都新航工业科技股份有限公司 | Casting device and casting method for special-shaped part |
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