CN108838372A - Large ship copper alloy propeller propeller hub counter-pressure casting forms non-linear pressure method - Google Patents
Large ship copper alloy propeller propeller hub counter-pressure casting forms non-linear pressure method Download PDFInfo
- Publication number
- CN108838372A CN108838372A CN201810836454.0A CN201810836454A CN108838372A CN 108838372 A CN108838372 A CN 108838372A CN 201810836454 A CN201810836454 A CN 201810836454A CN 108838372 A CN108838372 A CN 108838372A
- Authority
- CN
- China
- Prior art keywords
- pressure
- stage
- liquid
- casting
- copper alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/08—Controlling, supervising, e.g. for safety reasons
Abstract
Large ship copper alloy propeller propeller hub counter-pressure casting forms non-linear pressure method, it is related to a kind of pressure method.The present invention solves existing counter-pressure casting pressuring curve since control precision is low, it is difficult to the problem of guaranteeing the Stable Filling of propeller hub class casting of structure wall unevenness.Step 1: rising liquid process：A liter liquid process is divided into three phases, first liter of liquid stage is stalk filling process, and second liter of liquid stage is cross gate filling process, and third rises the liquid stage as ingate filling process；Step 2: cavity filling process：Cavity filling process is divided into four-stage；Step 3: pressurization：Step pressure is pressurized to 600KPa by 500KPa；Step 4: crystallization pressure maintaining：Pressure maintaining is carried out to pressure pressurized in step 3, the dwell time is Step 5: pressure release.The present invention is formed for the propeller hub counter-pressure casting of large ship copper alloy propeller.
Description
Technical field
The present invention relates to a kind of counter-pressure castings to form pressure method, and in particular to one kind is used for large ship copper alloy spiral
Paddle propeller hub counter-pressure casting forms non-linear pressure method.
Background technique
Counter-pressure casting is a kind of casting method derived from the basis of low pressure casting.With the difference of low pressure casting
It is inside to fill compressed gas in casting mold outer cover seal closure, is in casting mold under the certain pressure of gas.When liquid metal filling,
So that the pressure of gas in holding furnace is greater than the pressure of gas in casting mold, filling type, protecting for molten metal is realized as when low pressure casting
Pressure and pressurization.But casting is the crystallization and freezing under the effect of higher pressure at this time, so can guarantee that acquisition consistency is higher
Casting.
Counter-pressure casting provides technology ensuring for the liquid forming of higher-quality large ship copper alloy propeller.Differential pressure
Under casting condition, the copper alloy liquid in copper water packet is intracavitary greater than casting mold type by the gas pressure in copper water packet on liquid level
Pressure forces the alloy liquid in copper water packet to be filled to casting mold type chamber against gravity direction along stalk, until type is intracavitary
Liquid metals solidification is cooled to solid-state and obtains casting.Compared to gravitational casting, counter-pressure casting can control cavity filling process and fill type speed
Degree, makes to fill that type liquid level is steady, Filling Processes of Castings is complete and fine and close, it is effective reduce oxide slag inclusion and because feeding it is bad caused by contract
The defects of hole, shrinkage porosite.Traditional differential pressure casting is generally divided into a liter liquid, fills type, pressurization, pressure maintaining crystallization, five stages of decompression, due to large size
Ship copper alloy propeller hub uneven distribution in structure is even, and in order to make to fill type liquid level held stationary always, this requires differences
Die casting manufacturing apparatus will change when filling type according to casting structure and at any time fills type rate, i.e. pressurization pressure.
The cavity filling process of Traditional differential pressure casting is that constant pressure fills type, under this kind of pressuring method, when type chamber section changes, such as
Sudden expansion, sudden contraction, flaring, tapered, filling velocity can change, when filling velocity mutates, the Free Surface of molten metal
It will be unable to keep promoting horizontally forward again, but the case where bottom horizontal flow sheet occur.Such horizontal concussion will lead to liquid level oxidation film
It is destroyed or folds, folding process wraps air sometimes, and air is rolled into inside molten metal together.Molten metal is solidifying
Gu after, these, which are involved in duplicature made of the folding inside molten metal and ultimately form, splits defect.And traditional counter-pressure casting adds
Line buckle since control precision is inadequate, it is difficult to guarantee the Stable Filling of the propeller hub class casting of structure wall unevenness.
To sum up, existing counter-pressure casting pressuring curve is low due to controlling precision, it is difficult to guarantee the spiral of structure wall unevenness
The Stable Filling of paddle propeller hub class casting.
Summary of the invention
The present invention is to solve existing counter-pressure casting pressuring curve since control precision is low, it is difficult to guarantee structure wall unevenness
Propeller hub class casting Stable Filling the problem of, and then provide a kind of large ship copper alloy propeller propeller hub differential pressure
The non-linear pressure method of casting and forming.
The technical solution adopted by the present invention to solve the above technical problem is：
It is according to following that large ship copper alloy propeller propeller hub counter-pressure casting of the invention, which forms non-linear pressure method,
What step was realized：
Step 1: rising liquid process：A liter liquid process is divided into three phases, first liter of liquid stage is that stalk was filled
Journey, second liter of liquid stage are cross gate filling process, and the third liter liquid stage is ingate filling process,
The pressing speed in first liter of liquid stage is 4KPa/s, the pressure limit in first liter of liquid stage be 200KPa~
220KPa,
The pressing speed in second liter of liquid stage is 10KPa/s, the pressure limit in second liter of liquid stage be 220KPa~
260KPa,
The pressing speed of phase III is 5KPa/s, and the pressure limit that third rises the liquid stage is 260KPa~280KPa；
Step 2: cavity filling process：Cavity filling process is divided into four-stage,
First fill the type stage pressing speed be 6KPa/s, first fill the type stage pressure limit be 280KPa~
340KPa,
Second fill the type stage pressing speed be 3KPa/s, second fill the type stage pressure limit be 340KPa~
360KPa,
Third fill the type stage pressing speed be 6KPa/s, third fill the type stage pressure limit be 360KPa~
400KPa,
4th fill the type stage pressing speed be 10KPa/s, the 4th fill the type stage pressure limit be 400KPa~
500KPa；
Step 3: pressurization：Step pressure is pressurized to 600KPa by 500KPa；
Step 4: crystallization pressure maintaining：To pressure pressurized in step 3 progress pressure maintaining, the dwell time is
Step 5: pressure release.
Further, it is characterised in that it is 0.07m/s that liquid speed degree is risen in step 1.
Further, it is characterised in that slowing down pressing speed close at the casting abrupt change of cross-section in step 1.
Further, it is characterised in that slowing down pressurization speed close at the casting abrupt change of cross-section in step 2.
Further, it is characterised in that it is fuzzy that PID is carried out to pressuring curve at the abrupt change of cross-section in step 1 and step 2
Control.
Further, it is characterised in that after reaching liquid level hovering in casting sudden expansion structure, guaranteeing copper alloy metal liquid paving
Opened up it is next fill type section at the end of volume gas does not occur in the case where, The faster the better for spreading rate.
Further, after liquid level hovering is reached in sudden contraction structure, it is slowed to pressing speed steadily by pid regulator parameters
Speed needed for next stage.
The present invention has the advantages that compared with prior art：
Large ship copper alloy propeller propeller hub counter-pressure casting of the invention forms non-linear pressure method in type chamber section
When changing, such as sudden expansion, sudden contraction, flaring, tapered, filling velocity can accordingly change, i.e., to liter liquid process and cavity filling process into
Row refinement ensure that the propeller hub class casting of structure wall unevenness to improve counter-pressure casting pressuring curve control precision
Stable Filling.
Detailed description of the invention
Fig. 1 is the process that large ship copper alloy propeller propeller hub counter-pressure casting of the invention forms non-linear pressure method
Schematic diagram；
Fig. 2 is the flow diagram of existing counter-pressure casting molding pressure method；
Fig. 3 is the main view of copper alloy propeller propeller hub.
1-9 is that copper alloy propeller propeller hub each section foundation changes of section is divided into eight processes, above-mentioned eight mistakes in Fig. 3
Journey is corresponding with process each in Fig. 1, i.e., 1-2,2-3 and 3-4 are to rise liquid process, and 4-5,5-6,6-7 and 7-8 are cavity filling process；8-9
For pressurization.
Specific embodiment
Specific embodiment one：As shown in Figures 1 to 3, present embodiment large ship copper alloy propeller propeller hub differential pressure is cast
Causing the non-linear pressure method of type is realized according to following steps：
Step 1: rising liquid process：A liter liquid process is divided into three phases, first liter of liquid stage is that stalk was filled
Journey, second liter of liquid stage are cross gate filling process, and the third liter liquid stage is ingate filling process,
The pressing speed in first liter of liquid stage is 4KPa/s, the pressure limit in first liter of liquid stage be 200KPa~
220KPa,
The pressing speed in second liter of liquid stage is 10KPa/s, the pressure limit in second liter of liquid stage be 220KPa~
260KPa,
The pressing speed of phase III is 5KPa/s, and the pressure limit that third rises the liquid stage is 260KPa~280KPa；
Step 2: cavity filling process：Cavity filling process is divided into four-stage,
First fill the type stage pressing speed be 6KPa/s, first fill the type stage pressure limit be 280KPa~
340KPa,
Second fill the type stage pressing speed be 3KPa/s, second fill the type stage pressure limit be 340KPa~
360KPa,
Third fill the type stage pressing speed be 6KPa/s, third fill the type stage pressure limit be 360KPa~
400KPa,
4th fill the type stage pressing speed be 10KPa/s, the 4th fill the type stage pressure limit be 400KPa~
500KPa；
Step 3: pressurization：Step pressure is pressurized to 600KPa by 500KPa；
Step 4: crystallization pressure maintaining：To pressure pressurized in step 3 progress pressure maintaining, the dwell time is
Step 5: pressure release.
Specific embodiment two：As shown in Figure 1, rising liquid speed degree in present embodiment step 1 is 0.07m/s.So behaviour
Make, improves counter-pressure casting pressuring curve and control precision, ensure that the stable filling of the propeller hub class casting of structure wall unevenness
Type.Other compositions and connection relationship are same as the specific embodiment one.
Specific embodiment three：As shown in figures 1 and 3, close at the casting abrupt change of cross-section in present embodiment step 1
Slow down pressing speed.So operation avoids filling type liquid level surface film oxide broken so that filling type liquid level stabilizing hovers over catastrophe point
It splits, and then carries out next section of pressurization.Other compositions and connection relationship are the same as one or two specific embodiments.
Specific embodiment four：As shown in figures 1 and 3, close at the casting abrupt change of cross-section in present embodiment step 2
Slow down pressurization speed.So operation avoids filling the rupture of type liquid level surface film oxide so that filling type liquid level stabilizing hovers over catastrophe point,
And then carry out next section of pressurization.Other compositions and connection relationship are the same as the specific implementation mode 3.
Specific embodiment five：As shown in figures 1 and 3, in present embodiment step 1 and step 2 at the abrupt change of cross-section
PID fuzzy control is carried out to pressuring curve.So operation can prevent at the abrupt change of cross-section since pressing speed mutation is led
Surface film oxide rupture and volume gas caused by type liquid level shakes are filled in cause.Other compositions and connection relationship and specific embodiment
One, two or four is identical.
Specific embodiment six：Shown in Fig. 3, after liquid level hovering is reached in present embodiment casting sudden expansion structure, guaranteeing
Copper alloy metal liquid has been sprawled next in the case where volume gas not occurring at the end of filling type section, and The faster the better for spreading rate.So
Operation, can suitably increase pressing speed by pid parameter, it is made to complete to sprawl as early as possible.Other compositions and connection relationship and tool
Body embodiment five is identical.
Specific embodiment seven：As shown in figure 3, passing through adjusting after reaching liquid level hovering in present embodiment sudden contraction structure
Pid parameter makes pressing speed steadily be slowed to speed needed for next stage.So operation, can be to avoid molten metal splashing.It is other
Composition and connection relationship and specific embodiment one, two, four or six are identical.
Claims (7)
1. a kind of large ship copper alloy propeller propeller hub counter-pressure casting forms non-linear pressure method, it is characterised in that the difference
Pressing the non-linear pressure method of casting and forming is realized according to following steps：
Step 1: rising liquid process：A liter liquid process is divided into three phases, first liter of liquid stage is stalk filling process, the
Two liters of liquid stages are cross gate filling process, and the third liter liquid stage is ingate filling process,
The pressing speed in first liter of liquid stage is 4KPa/s, and the pressure limit in first liter of liquid stage is 200KPa~220KPa,
The pressing speed in second liter of liquid stage is 10KPa/s, and the pressure limit in second liter of liquid stage is 220KPa~260KPa,
The pressing speed of phase III is 5KPa/s, and the pressure limit that third rises the liquid stage is 260KPa~280KPa；
Step 2: cavity filling process：Cavity filling process is divided into four-stage,
First pressing speed for filling the type stage is 6KPa/s, and the first pressure limit for filling the type stage is 280KPa~340KPa,
Second pressing speed for filling the type stage is 3KPa/s, and the second pressure limit for filling the type stage is 340KPa~360KPa,
The pressing speed that third fills the type stage is 6KPa/s, and the pressure limit that third fills the type stage is 360KPa~400KPa,
4th pressing speed for filling the type stage is 10KPa/s, and the 4th pressure limit for filling the type stage is 400KPa~500KPa；
Step 3: pressurization：Step pressure is pressurized to 600KPa by 500KPa；
Step 4: crystallization pressure maintaining：To pressure pressurized in step 3 progress pressure maintaining, the dwell time is
Step 5: pressure release.
2. large ship copper alloy propeller propeller hub counter-pressure casting according to claim 1 forms non-linear pressure method,
It is characterized in that rising liquid speed degree in step 1 is 0.07m/s.
3. large ship copper alloy propeller propeller hub counter-pressure casting according to claim 1 or 2 forms non-linear pressurization side
Method, it is characterised in that slowing down pressing speed close at the casting abrupt change of cross-section in step 1.
4. large ship copper alloy propeller propeller hub counter-pressure casting according to claim 3 forms non-linear pressure method,
It is characterized in that slowing down pressurization speed close at the casting abrupt change of cross-section in step 2.
5. large ship copper alloy propeller propeller hub counter-pressure casting according to claim 1,2 or 4 forms non-linear pressurization
Method, it is characterised in that PID fuzzy control is carried out to pressuring curve at the abrupt change of cross-section in step 1 and step 2.
6. large ship copper alloy propeller propeller hub counter-pressure casting according to claim 5 forms non-linear pressure method,
It is characterized in that having sprawled next type section of filling after reaching liquid level hovering in casting sudden expansion structure in guarantee copper alloy metal liquid and having tied
In the case where volume gas not occurring when beam, The faster the better for spreading rate.
Add 7. according to claim 1, the molding of large ship copper alloy propeller propeller hub counter-pressure casting described in 2,4 or 6 is non-linear
Pressure method makes pressing speed steadily be slowed to next stage institute after reaching liquid level hovering in sudden contraction structure by pid regulator parameters
Need speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810836454.0A CN108838372B (en) | 2018-07-26 | 2018-07-26 | Nonlinear pressurization method for differential pressure casting molding of copper alloy propeller hub of large ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810836454.0A CN108838372B (en) | 2018-07-26 | 2018-07-26 | Nonlinear pressurization method for differential pressure casting molding of copper alloy propeller hub of large ship |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108838372A true CN108838372A (en) | 2018-11-20 |
| CN108838372B CN108838372B (en) | 2020-09-08 |
Family
ID=64195019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810836454.0A Active CN108838372B (en) | 2018-07-26 | 2018-07-26 | Nonlinear pressurization method for differential pressure casting molding of copper alloy propeller hub of large ship |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108838372B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110181024A (en) * | 2019-07-09 | 2019-08-30 | 佛山市南海奔达模具有限公司 | Wheel hub low-pressure casting process |
| CN115365478A (en) * | 2022-08-12 | 2022-11-22 | 中国兵器装备集团西南技术工程研究所 | Nonlinear pressurization control method and system for casting and forming of complex metal component |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4213494A (en) * | 1977-06-15 | 1980-07-22 | Novatome | Process and apparatus for low pressure casting |
| CN101497119A (en) * | 2008-01-31 | 2009-08-05 | 上海爱仕达汽车零部件有限公司 | Pressurizing method of diesel motor aluminium alloy cylinder metal mould low-pressure casting |
| CN101758203A (en) * | 2008-11-12 | 2010-06-30 | 郑东海 | Process for smelting and lower-pressure casting of aluminum alloy wheel hub |
| JP2012106277A (en) * | 2010-11-19 | 2012-06-07 | Sukegawa Electric Co Ltd | Low-pressure casting apparatus and low-pressure casting method |
| CN105081284A (en) * | 2015-09-17 | 2015-11-25 | 高文梅 | Method for casting outstanding shell of brake booster vacuum pump |
| CN105583393A (en) * | 2016-03-08 | 2016-05-18 | 北京航空航天大学 | Sequential pressure boost method after crystallization pressure maintaining and for metal-mould low-pressure casting forming of aluminum alloy automobile chassis cast parts |
| CN107020367A (en) * | 2017-04-26 | 2017-08-08 | 哈尔滨工业大学 | A kind of large ship copper alloy propeller counter-pressure casting manufacturing process |
-
2018
- 2018-07-26 CN CN201810836454.0A patent/CN108838372B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4213494A (en) * | 1977-06-15 | 1980-07-22 | Novatome | Process and apparatus for low pressure casting |
| CN101497119A (en) * | 2008-01-31 | 2009-08-05 | 上海爱仕达汽车零部件有限公司 | Pressurizing method of diesel motor aluminium alloy cylinder metal mould low-pressure casting |
| CN101758203A (en) * | 2008-11-12 | 2010-06-30 | 郑东海 | Process for smelting and lower-pressure casting of aluminum alloy wheel hub |
| JP2012106277A (en) * | 2010-11-19 | 2012-06-07 | Sukegawa Electric Co Ltd | Low-pressure casting apparatus and low-pressure casting method |
| CN105081284A (en) * | 2015-09-17 | 2015-11-25 | 高文梅 | Method for casting outstanding shell of brake booster vacuum pump |
| CN105583393A (en) * | 2016-03-08 | 2016-05-18 | 北京航空航天大学 | Sequential pressure boost method after crystallization pressure maintaining and for metal-mould low-pressure casting forming of aluminum alloy automobile chassis cast parts |
| CN107020367A (en) * | 2017-04-26 | 2017-08-08 | 哈尔滨工业大学 | A kind of large ship copper alloy propeller counter-pressure casting manufacturing process |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110181024A (en) * | 2019-07-09 | 2019-08-30 | 佛山市南海奔达模具有限公司 | Wheel hub low-pressure casting process |
| CN115365478A (en) * | 2022-08-12 | 2022-11-22 | 中国兵器装备集团西南技术工程研究所 | Nonlinear pressurization control method and system for casting and forming of complex metal component |
| CN115365478B (en) * | 2022-08-12 | 2023-08-29 | 中国兵器装备集团西南技术工程研究所 | Nonlinear pressurization control method and system for casting and forming complex metal component |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108838372B (en) | 2020-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR20040030134A (en) | Method and apparatus for low pressure aluminum foam casting | |
| US10576535B2 (en) | Mold for fabricating a monocrystalline blade by casting, a fabrication installation and method using the mold | |
| CN108838372A (en) | Large ship copper alloy propeller propeller hub counter-pressure casting forms non-linear pressure method | |
| CN104827000B (en) | A kind of casting method of gear ring | |
| JP5120295B2 (en) | Low pressure casting mold | |
| CN107020367A (en) | A kind of large ship copper alloy propeller counter-pressure casting manufacturing process | |
| CN103088219B (en) | Apparatus and method for degassing cast aluminum alloys | |
| CN111014617B (en) | Forming method of thin-wall volute casing with spiral structure based on antigravity casting | |
| JP2009274098A (en) | Sand mold for low-pressure casting and low-pressure casting apparatus utilizing the same | |
| CN102513509A (en) | Casting technique for bracket casting of marine pod-type electric propulsion system | |
| JP2007111741A (en) | Casting method for enabling highly efficient production | |
| CN108543932A (en) | A kind of casting method of aluminium alloy castings | |
| CN106216636B (en) | A kind of AlMg3 aluminium alloy vanes tip arrester low-pressure casting method | |
| CN106180579A (en) | A kind of casting mold method for rapid cooling | |
| US9744587B2 (en) | Mould for monocrystalline casting | |
| CN107511468A (en) | Large ship copper alloy propeller antigravity shapes air cooling larynx cut-off and rises liquid method | |
| JPH03230860A (en) | Pressurized casting method | |
| CN104275468A (en) | Low-pressure casting process of train aluminum alloy gear case | |
| CN202527690U (en) | Solidification system for manufacturing magnesium alloy casting ingot | |
| CN109434025A (en) | A kind of process for eliminating supramarginal plate crackle metallurgical imperfection | |
| CN1322948C (en) | Mould and method for preparation high-pressure switch cast aluminium can | |
| CN104174817B (en) | A kind of ocean platform climb casting and the Technology for Heating Processing of machine Connection Block | |
| CN104439147A (en) | Method for treating casting contraction cavities | |
| EP3421156B1 (en) | Casting method for producing a blade for a gas turbine | |
| JP6198125B2 (en) | Manufacturing method of casting article |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |