CN1788886A - Magnesium alloy water glass type full form casting process - Google Patents
Magnesium alloy water glass type full form casting process Download PDFInfo
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- CN1788886A CN1788886A CN 200410104219 CN200410104219A CN1788886A CN 1788886 A CN1788886 A CN 1788886A CN 200410104219 CN200410104219 CN 200410104219 CN 200410104219 A CN200410104219 A CN 200410104219A CN 1788886 A CN1788886 A CN 1788886A
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Abstract
The present invention relates to magnesium alloy casting technology, and is especially investment process of magnesium alloy with water glass investment pattern. The investment process of magnesium alloy with water glass investment pattern of the present invention is superior to available pressure casting, gypsum investment pattern casting and sand mold casting and may be used to replace the available magnesium alloy casting processes. The technological process of the investment process of magnesium alloy with water glass investment pattern includes the following steps: making investment mold suitable for magnesium alloy casting; making water glass mold casing suitable for magnesium alloy casting; smelting magnesium alloy; and casting magnesium alloy.
Description
Technical field magnesium alloy cast
Background technique
Model casting is a kind of near-net-shape technique, can be divided into water glass type, silica solution type, silester type, compound and gypsum type melting mould founding according to its casting mold.It is mainly used in the molding [1] of various guiding principles, aluminium alloy and copper-alloy casting.The moulding process of Mg alloy castings has: sand casting, die casting [2], and semi-solid forming is in research [3], and magnesium alloy gypsum shape model casting also has been reported [4].So far the not no report of magnesium alloy water glass type full form casting process.
Die casting at present becomes magnesium alloy molded main technique, but die casting exhaust is bad, causes casting to have stomata mostly, not can be carried out Post isothermal treatment to improve its mechanical property；And equipment investment is big.Magnesium alloy gypsum shape model casting is found, cast(ing) surface is also easy to produce pit point, and cast structure coarse grains reduce mechanical castings because gypsum mould poor air permeability and heat dissipation are slow in implementation process.The technique production cycle is too long, and casting cost is high, is not easy to promote.
Bibliography:
1, handbook is cast.Special Processes of Metal Castings.Chinese Mechanical Engineering Society casts branch and compiles.China Machine Press.2003.2
2, the present Research and application prospect new material industry 2003 of the pungent pleasant virtue diecast magnesium alloy of Ji Zesheng
3, the status and development prospect Casting Equipment research 2004 of Han Fuyin Zhang Jinshan magnesium alloy semi solid state casting.4
4, Zhang Shaoxing, Vera Wang's magnesium alloy gypsum type melting mould founding aviation journal 1993.8
Summary of the invention
Present patent application magnesium alloy water glass type full form casting process technology contents include:
1, it is suitble to the wax-pattern manufacture craft and parameter of magnesium alloy cast
2, it is suitble to the sodium silicate shell manufacturing process and parameter of magnesium alloy cast
3, process for smelting magnesium alloy and parameter
4, magnesium alloy pouring technique and parameter
Magnesium alloy water glass type full form casting process is compared with magnesium alloy pressure-casting, because of its shell good permeability, and the thermally processable mechanical property for improving casting；Its equipment investment scale only has 1/10th of die casting；Compared with gypsum type melting mould founding technology, because its shell rapid heat dissipation and retained strength are low, casting crystalline grain can be refined, improves the mechanical property of casting, casting easy to clean, surface roughness are low, dimensional accuracy is high；Castings production cycle time 3/4ths.
The technique of present patent application belongs to magnesium alloy cast technical field, the alternative die casting of the technique, gypsum type melting mould founding and sand casting, the molding of the Mg alloy castings applied to the various trades mark, it is bad because being vented to solve current die casting process of magnesium alloy, the problem of casting air content is big, not can be carried out heat treatment；It is slow to solve gypsum mould poor air permeability heat dissipation in gypsum type melting mould founding, caused by cast(ing) surface pit point and coarse grains problem.
Specific embodiment
Figure of description is process flow.
1, prepared by wax-pattern
Mould material: various low temperature mould material, rosin-cerul mould material and fill mould material.
Mould making process parameter:
70 ~ 80 DEG C of pressure injection temperature；20 ~ 30 DEG C of die mould temperature.
0.3 ~ 1.5Mpa of Pressure Casting；Dwell time 1 ~ 3 minute.
18 ~ 30 DEG C of molding room temperature；18 ~ 28 DEG C of wax-pattern coolant water temperature.
Assemble wax-pattern
2, shell processed
Investment precoat proportion
Fused silica powder: waterglass: wetting agent=1.15: 1.0: 0.05
Reinforced layered slurry proportion
Cab-O-sil: clay: waterglass: wetting agent=0.6: 0.4: 1.0: 0.05
Curing agent: ammonium chloride: water=(20 ~ 30): (80 ~ 70)
Process for making shell parameter:
| The number of plies | Coating | Viscosity/S | Stucco granularity (screen size) | Curing agent temperature DEG C | Firm time point | Drying time (divides) | |
| Before hardening | After hardening | ||||||
| 1 2 3 4 5 | Fused silica powder Cab-O-sil+clay Cab-O-sil+clay Cab-O-sil+clay Cab-O-sil+clay | 30 20~35 25~35 25~35 25~35 | 70/140 70/140 70/140 12/30 12/30 | 10~25 25~35 30~35 30~35 30~35 | 3~5 3~5 5~10 5~10 5~10 | 30~60 5~15 5~15 5~15 5~15 | 20~30 20~30 20~30 20~30 20~30 |
Dewaxing roasting:
High steam dewaxing pressure: 0.38 ~ 0.75MPA temperature: 140 ~ 170 DEG C of times: 6 ~ 15 points
Maturing temperature: 850 DEG C of times: 0.5 ~ 1.5 hour
Post-processing
3, magnesium alloy smelting
Charging fusion crucible is heated to dark red, adds flux, charging is warming up to fusing.
Metamorphism treatment temperature: 720 ~ 780 DEG C；Time: 5 ~ 10 points.
Refining temperature: 700 ~ 750 DEG C are spread refining agent until there is mirror surface while stirring.
Fracture surface examination pours sample and checks fracture to qualification
Molten metal temperature is reduced to pouring temperature.
4, it is poured:
Pouring temperature: 640 ~ 730 DEG C
Mold temperature: 200 ~ 400 DEG C
The duration of pouring: 5 ~ 12S
5, casting is cleared up.
Claims (1)
- Technical characteristicCasting alloy material used: the magnesium alloy of the various trades markInvestment shell: sodium silicate shellClaimed rangeThe magnesium alloy of the various trades mark is formed using the model casting of sodium silicate shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410104219 CN1788886A (en) | 2004-12-17 | 2004-12-17 | Magnesium alloy water glass type full form casting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410104219 CN1788886A (en) | 2004-12-17 | 2004-12-17 | Magnesium alloy water glass type full form casting process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1788886A true CN1788886A (en) | 2006-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410104219 Pending CN1788886A (en) | 2004-12-17 | 2004-12-17 | Magnesium alloy water glass type full form casting process |
Country Status (1)
| Country | Link |
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| CN (1) | CN1788886A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102166618A (en) * | 2011-03-16 | 2011-08-31 | 江门市正科金属制品有限公司 | Method for manufacturing balance block for compressors |
-
2004
- 2004-12-17 CN CN 200410104219 patent/CN1788886A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102166618A (en) * | 2011-03-16 | 2011-08-31 | 江门市正科金属制品有限公司 | Method for manufacturing balance block for compressors |
| CN102166618B (en) * | 2011-03-16 | 2012-11-28 | 江门市正科金属制品有限公司 | Method for manufacturing balance block for compressors |
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