CN1063687C - Technique for integral casting of stainless steel propeller - Google Patents
Technique for integral casting of stainless steel propeller Download PDFInfo
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- CN1063687C CN1063687C CN97108262A CN97108262A CN1063687C CN 1063687 C CN1063687 C CN 1063687C CN 97108262 A CN97108262 A CN 97108262A CN 97108262 A CN97108262 A CN 97108262A CN 1063687 C CN1063687 C CN 1063687C
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- sand
- clay
- casting
- sodium silicate
- facing
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Abstract
The present invention discloses an integral casting technique for NACR stainless steel propellers, which relates to an integral casting technique for NACR propellers. The present invention has the technical characteristic that an integral casting mould is adopted; backing sand which is common clay sand and facing sand which is high aluminous sand are used as raw materials for molding, and magnesite sand powder is used as paint to form a backing sand-facing sand-paint composite layer at the time of molding; the casting time and the casting temperature are selected by using an open casing system.
Description
The present invention relates to a kind of corrosion-resistant steel Luo and revolve the oar integral casting process.
The general scraper plate that adopts of existing screw propeller casting is made mo(u)ld bottom half in conjunction with pitch plate, meets Ye Duoxiang with the wooden model heart or the sand mo(u)ld heart and makes mo(u)ld top half, because the wooden model heart is made very difficulty, and sand mo(u)ld heart intensity is low, and scale error is big, both cannot say for sure to demonstrate,prove casting quality, and when taking a lot of work again, work efficiency is low.Aspect Modeling Material, general Gao Meng, high-chromium alloy steel casting are made floor sand with quarz sand, make facing sand with magnesia or chromite sand, and these material prices are more expensive, and reuse is relatively poor.Aspect casting system, adopt bottom filling more, every leaf is established a runner gate, and ingate imports along blade plane, and establishes chill and lacing wire,
Core cylinder iron, big rising head is established on the hub top, this system's moulding complexity, the molten steel stroke is long, and temperature is low, easily produces defectives such as misrun, and yield rate only is 60%.New material MACR corrosion-resistant steel (ZL85105573.7) has the few chromium of no nickel, anti-ammonia, alkali, marine corrosion, premium properties such as intensity height, but contain more basic anhydride in its molten steel, scab takes place easily and produce cold shut and surperficial elephant skin, in addition, this steel shrinks big, be easy to generate shrinkage cavity and crackle, thereby the casting difficulty is big.
The object of the present invention is to provide a kind of integral casting of stainless steel propeller technology.
The present invention be directed to the problem that exists in the casting difficult point of MACR novel stainless steel and the screw propeller foundry technique, worked out and a kind ofly can guarantee casting quality, reduce production costs, can adopt on the whole simultaneously, stove is convenient in the nowel moulding dries, improve the technology of work efficiency, its technological process comprises: make whole mold-sand molding-oven dry-moulding by casting-surface treatment-finished products such as polishing.
The making of whole mold
At first by design calculation secondary processes parameter,, process cover in the iron of propeller hub with the tangent plane plate and the pitch plate of plastic flagstone or the leaf plate of paperboard, each radius; Produce mo(u)ld bottom half with rubbing board, draw line of centers and helix line are completed leaf plate to line, fix each tangent plane plate on leaf plate; Between each tangent plane plate, fill out fast solid filler such as clay, the sodium silicate sand etc. of rapid-curing cutback of energy, repair fairing and become the mould heart, treat to make mo(u)ld top half by leaf after it does admittedly; Unpack to remove the mould heart, cover in the following good iron, mould assembling pour into a mould whole mold blank, this blank is trimmed by the one-time process parameter, and reaches requirement do static balance, whole mold, its material can be steel, aluminium or plastics.
Sand molding
The used floor sand of the present invention is a common clay sand, and facing sand is neutrality or basic matterials such as high-al clay sand, and coating is alkalescence such as magnesia powder material preferably.The facing sand proportioning is: high-al clay sand 100%, and clay 2-10%, sodium silicate 0-15%, moisture content 2-6%, best proportioning is a high-al clay sand 100%, clay 3-5%, sodium silicate 5-8%, moisture content 3-5%.Coating formula is: magnesia powder 100%, and clay 2-8%, sodium silicate or syrup 3-12%, water is an amount of, and best proportioning is a magnesia powder 100%, clay 3-4%, sodium silicate or syrup 5-8%, water is an amount of.During moulding, facing sand and coating are modulated by said ratio, floor sand is put into case and is built reality, at first on the following profile of whole mold, brush the thick facing sand of 10mm and whole mold is put into the common clay sand floor sand, compaction moulding, make it floor sand surface coverage layer of even facing sand, take out whole mold, evenly be coated with again on the facing sand surface and coat, so just make the composite stratotype with common clay sand (floor sand)-high-al clay sand (facing sand)-magnesia powder (coating) composition of screw propeller mo(u)ld bottom half, according to said method made the composite stratotype of screw propeller mo(u)ld top half then.
Moulding by casting
The present invention is a unchoked running system, is beneficial to quick cast with big pouring basin.Advance molten steel from rising head, choked flow steadily divides to advance each blade then at the rising head neck, and blade top and blade tip place set out gas port, consecutive solidification, and rising head is adjusted with the size of watering fluence with spherical half blind riser, the size of riser neck and height, so that the feeding passage is unimpeded.Flow out for the ease of exhaust and slag liquid, offer excessive slag chute at blade tip and leaf top.During cast, the used pouring temperature of the present invention is 1500 ℃-1550 ℃, and be the duration of pouring, and the 300-700kg molten steel is 8-10 second, and the following molten steel of 300kg (not comprising 300kg) is 5 seconds.
Compare with existing propeller foundry technique, the present invention has following advantage:
1, adopt the whole mold of cover in the iron, mould making process is easier, and is easy to process, and the material-saving that saves time, mold process easily detect and finishing, are convenient to mold itself and reach the balance requirement, thereby can improve casting dimension accuracy;
2, can adopt on the whole, the nowel casting, improved molding process, improve work efficiency more than 5 times;
3, common clay sand (floor sand)-high-al clay sand (facing sand)-magnesia powder (coating) composite stratotype is high temperature resistant, effectively prevents the fusion effect of molten steel to common clay sand, and anti-stick grittiness is good, the Modeling Material cost is low, the old sand reuse is good, and cast(ing) surface is more smooth, and quality is better;
4, adopt pouring temperature of the present invention and time, can effectively prevent the defective of cold shut and elephant skin and the generation of shrinkage cavity and crackle, yield rate can reach 70-80%.
Embodiment
1, adopts whole aluminium
2, Modeling Material.Floor sand-common clay sand; Facing sand proportioning: high-al clay sand 100%, clay 4%, sodium silicate 6%, moisture 4%; Coating formula: magnesia powder 100%, clay 4%, sodium silicate 7%, water is an amount of.
3, adopt unchoked running system, 1550 ℃ of pouring temperatures, the duration of pouring, the 250kg molten steel was 5 seconds.
Claims (2)
1, a kind of integral casting of stainless steel propeller technology comprises and makes whole mold-sand molding-oven dry-moulding by casting-surface treatment-finished products such as polishing, the invention is characterized in:
1. adopt the whole mold that cover in the propeller hub iron is housed;
2. moulding is a common clay sand with the raw MAT'L floor sand, and the facing sand proportioning is a high-al clay sand 100%, clay 2-10%, sodium silicate 0-15%, moisture content 2-6%; Coating formula is a magnesia powder 100%, clay 2-8%, and sodium silicate (or syrup) 3-12%, water is an amount of; Form common clay sand (floor sand)-high-al clay sand (facing sand)-magnesia powder (coating) composite stratotype during moulding;
3. adopt unchoked running system, pouring temperature is 1500 ℃-1550 ℃, and be 300kg-700kg molten steel 8-10 second the duration of pouring, the following molten steel of 300kg (not comprising 300kg) 5 seconds.
2, integral casting of stainless steel propeller technology according to claim 1, the best proportioning that it is characterized in that facing sand is a high-al clay sand 100%, clay 3-5%, sodium silicate 5-8%, moisture content 3-5%; The best proportioning of coating is a magnesia powder 100%, clay 3-4%, and sodium silicate or syrup 5-8%, water is an amount of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97108262A CN1063687C (en) | 1997-10-16 | 1997-10-16 | Technique for integral casting of stainless steel propeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97108262A CN1063687C (en) | 1997-10-16 | 1997-10-16 | Technique for integral casting of stainless steel propeller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1187398A CN1187398A (en) | 1998-07-15 |
| CN1063687C true CN1063687C (en) | 2001-03-28 |
Family
ID=5170274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97108262A Expired - Fee Related CN1063687C (en) | 1997-10-16 | 1997-10-16 | Technique for integral casting of stainless steel propeller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1063687C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101386056B (en) * | 2008-10-07 | 2010-12-08 | 大连船用推进器有限公司 | Tire retreading casting molding method |
| CN102658342B (en) * | 2012-05-03 | 2014-03-26 | 黄善送 | Rolling machining method for propellers of stainless steel ships |
| CN104014742A (en) * | 2014-05-09 | 2014-09-03 | 大连理工大学 | Casting process and casting mould of large propeller hub body |
| CN104030708B (en) * | 2014-06-17 | 2015-12-02 | 张希君 | A kind of precision casting sand and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1026471C (en) * | 1990-08-07 | 1994-11-09 | 宫哲圣 | Propeller line skeleton moulding method |
| CN1131398A (en) * | 1994-07-27 | 1996-09-18 | 毕彻致冷机有限公司及两合公司 | Method and casting device for producing parts with helically symmetrical outer contour |
| CN1140112A (en) * | 1996-05-10 | 1997-01-15 | 河北省沧州机械厂 | Centrifugal casting and moulding technique for screw of screw oil extruder |
-
1997
- 1997-10-16 CN CN97108262A patent/CN1063687C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1026471C (en) * | 1990-08-07 | 1994-11-09 | 宫哲圣 | Propeller line skeleton moulding method |
| CN1131398A (en) * | 1994-07-27 | 1996-09-18 | 毕彻致冷机有限公司及两合公司 | Method and casting device for producing parts with helically symmetrical outer contour |
| CN1140112A (en) * | 1996-05-10 | 1997-01-15 | 河北省沧州机械厂 | Centrifugal casting and moulding technique for screw of screw oil extruder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1187398A (en) | 1998-07-15 |
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