CN1209217C - Reciprocating jet control shaping technology - Google Patents
Reciprocating jet control shaping technology Download PDFInfo
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- CN1209217C CN1209217C CNB031170668A CN03117066A CN1209217C CN 1209217 C CN1209217 C CN 1209217C CN B031170668 A CNB031170668 A CN B031170668A CN 03117066 A CN03117066 A CN 03117066A CN 1209217 C CN1209217 C CN 1209217C
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Abstract
The present invention relates to a forming technique for controlling reciprocating spray. The forming technique has the following method that alloy smelt enters an atomization region under the action of gravity; an unlimited non-scanning secondary atomizer is used; the alloy smelt is crushed by the atomizer to form stable and dense droplet spraying streams; alloy droplets which continuously deposit are thoroughly melted and quickly solidified to make the droplets electrified and fly to a base in an electric field; air pressure in a sediment chamber is accurately controlled; dust which is not bonded is discharged through an air outlet in time; technological parameters are controlled on line; and the optimal sediment state is satisfied all the time. The forming technique solves problems existing in the background art and has the advantages that the solidification rates of sediment blanks achieve 10<4>K/s, the mean grain sizes achieve 0.9 to 20 mu m, and simultaneously, the density is high, the layer interfaces are fewer, and the material yield is greatly increased; the forming technique is suitable for preparing the sediment blanks with large specifications.
Description
Technical field
What the present invention relates to is the reciprocal spray deposition processing of a kind of control, and particularly a kind of reciprocal spray deposition processing of control for preparing big specification, high performance alloys and particulate composite thereof belongs to alloy and field of compound material.
Background technology
Reaction-injection moulding (claiming jet deposition again) technology is that alloy melt is atomized, and high speed deposition is to substrate then, and rapid solidification obtains the method for blank.It is the conventional spray forming technology of representative that Zhongnan Polytechnic Univ's in October, 1998 doctorate paper " research of multi-layer spray deposition process and material thereof " has been introduced with Osprey technology, the unrestricted formula of this process using, scanning spraying gun, unidirectional mode is adopted in the relative movement of alloy liquid droplet injection stream and substrate, in rotation, horizontal single-headed moves with respect to the fixed injection stream in substrate.Injection stream is in the substrate surface successive sedimentation, settling solidification rate 10
2～10
3K/s, mean grain size is generally more than 20 μ m, the hot-fluid that is transmitted by the basad surface of injection stream increases along with deposit preform thickness, when thickness surpasses a certain threshold value, the settling rate of heat release is lower than the hot-fluid of injection stream, sedimental temperature rises and surpasses optimum range, and deposited tube, slab thickness are less than 50mm usually.Find by literature search, Chinese patent application number: 98112773.8, name is called: the multilayer spraying deposition method and the equipment of preparation large deposited blank, this patent development multi-layer spray deposition technology, adopt injection stream and substrate to-and-fro movement, deposit preform is made up of several layers, to identical alloy mass flow rate, the deposit preform rate of heat release of this pattern is adjusted by changing the number of plies, is suitable for preparing rate of cooling 10
4K/s～thick deposit preform.But the problem that the multilayer spray forming technology exists mainly contains: (1) adopts the tight coupling spraying gun, and the atomised jet flow point looses, and injection density is low, forms a large amount of holes; (2) the easy cutout of gaging somebody of tight coupling spraying gun, alloy melt pressure head instability, melt speed instability, atomised jet stream is unstable; (3) technological process lacks monitoring and the feedback to the key physical state, does not set up with the technological process mathematical model that accurately is controlled to be target, and the bed interface that to-and-fro movement forms is in conjunction with very poor.The relative density of multilayer spray shaping deposit preform is lower than 85%, and the bed interface bonding strength is low, has fine and close oxide compound and a large amount of holes, even through the extruding of follow-up aximal deformation value, processing such as rolling, the closed pore of these oxide compounds and part can't be eliminated.In addition, in above-mentioned two kinds of patterns, tiny drop is subjected to the interference of turbulence easily when deposition, can't deposit to substrate surface, and the material recovery rate reduces.The recovery rate of Osprey pattern is generally about 80%, and the recovery rate of multilayer spray shaping mode is about 70%.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of control reciprocal spray deposition processing, especially for the reciprocal spray deposition processing of control for preparing big specification, high performance alloys and particulate composite thereof, by adopting unrestricted formula, non-scanning, secondary spraying gun, the alloy atomization injection stream is moved in electric field, online accurate control to-and-fro movement, solved that deposit preform density in the above-mentioned background technology is low, recovery rate is low, the bed interface in conjunction with poor, solidification rate is low, the technology problem of unstable.
The present invention is achieved by the following technical solutions, technology of the present invention is as follows: alloy melt enters the atomizing zone under action of gravity, adopt unrestricted formula, non-scanning, secondary spraying gun, the spraying gun working medium is the reactant gas of rare gas element or setting, by spraying gun alloy melt is pulverized, form stable and intensive droplet jet stream, the alloy liquid droplet of successive sedimentation fully fuses, rapid solidification; Make the alloy atomization liquid droplet charged and in electric field, fly to substrate; Accurately control the air pressure in the sediment chamber, the agglutinating dust is not in time got rid of by exhaust outlet; The on-line Control processing parameter satisfies the optimal deposition state all the time.
Below technology of the present invention is further described, particular content is as follows:
1, described alloy melt, 100～200 ℃ of insulations (being superheating temperature) more than liquidus line, flow into the bottom pour ladle that is incubated at uniform temp by tundish then, melt height is greater than 250mm in the bottom pour ladle, the liquid level difference is less than 10mm up and down, and melt flows into spraying gun via the conduit that is installed in the bottom pour ladle bottom.Liquid level is controlled alloy automatically and is toppled over action by position or weight sensor on-line measurement, keeps liquid level in setting range.Have stable alloy pressure head and flow velocity, the aluminium alloy melt mass flow rate is at 6～15kg/min.
2, described unrestricted formula, non-scanning, secondary spraying gun, its working medium is the reactant gas of rare gas element or setting, and alloy melt enters one-level atomizing zone under action of gravity, and the one-level atomization pressure is at 1～3atm, and atomizing angle is 0～3 °.One-level atomizing makes alloy melt not be subjected to the influence of main spraying gun negative pressure turbulent flow, can not gag somebody, the stable secondary master zone that atomizes that enters.The secondary atomization pressure is at 6～15atm, and atomizing angle is 7～15 °, and the alloy melt that will have stable flow velocity by spraying gun is pulverized, and forms stable and intensive droplet jet stream.Intensive sedimentary alloy liquid droplet fully fuses continuously, and rapid solidification.Spraying gun does not carry out scanning motion, reduces the sparse sedimentary zone of injection stream, improves the settling density, this tissue defects of basically eliminate primary particle border.
3, describedly making liquid droplet charged and fly to substrate in electric field, is to show alloy melt and substrate applies the 36V direct current, makes alloy liquid droplet all have electric charge, and towards the substrate flight of oppositely charged, size of current is decided on technology, and the capture rate of micro mist significantly improves.
4, the air pressure in the described accurate control sediment chamber, be specially: the gaseous tension in the sediment chamber is closely related with atomizing, generally at 1～1.1atm.Gaseous tension adopts digital pressure transmitter on-line measurement in the sediment chamber, controls exhaust outlet door opening angle automatically, and indoor gas pressure is maintained in the setting range.Exhaust outlet has the outlet area that can regulate continuously, external explosion-proof fan, and the air-flow of carrying dust secretly purifies the back emptying through one or more levels cyclonic separator, and the micro mist that solidifies fully that minimizing sediment chamber turbulence is carried secretly is in the deposition of deposit surface.
5, described on-line Control processing parameter, specific as follows:
The flying distance of injection stream before depositing to substrate surface is in 400～500mm scope, atomised jet stream is with respect to the reciprocal tangential movement of substrate, settling is made up of reciprocal sedimentary multilayer, the initial preheating temperature of substrate is than low 50～150 ℃ of the solidus curve of alloy, and deposit surface temperature and injection stream are respectively solidus curve ± 30 ℃ and more than the solidus curve 30～100 ℃ at presedimentary optimum temperature range.For pipe, substrate is the core pipe of horizontal positioned, speed of rotation 60～160rpm, on-line Control to-and-fro movement and deposition distance; For ingot blank, substrate is a circular slab, and speed of rotation is 80～150rpm, on-line Control up-and-down movement and to-and-fro movement; For slab, substrate is dull and stereotyped, on-line Control to-and-fro movement and deposition distance.The on-line Control processing parameter satisfies the optimal deposition state all the time, and the bed interface tissue defects that the basically eliminate to-and-fro movement forms keeps form accuracy.
Adopt digital infrared thermometer, stadimeter on-line measurement deposit surface temperature, deposit preform thickness, employing industrial computer and programmable logic controller (PLC) are accepted the independent process parameter signal and are sent the electric machine control instruction, on-line Control deposition distance, to-and-fro movement speed make depositing temperature and distance in optimum range.
Allow to exist a few bundle melt jet streams among the present invention, add particle and can form individual injection stream.The present invention be applicable to the preparation internal diameter greater than 100mm, wall thickness greater than 20mm, length heavy wall pipe greater than 50mm, and diameter is greater than the big specification cylinder ingot blank of 100mm, thickness is greater than the sheet material of 10mm.
The present invention has substantive distinguishing features and marked improvement, and technology of the present invention has solved the problem that exists in the background technology, and the beneficial effect of acquisition is: deposit preform solidification rate height (10
4～K/s), organize meticulous (mean grain size 0.9～20 μ m), simultaneously, density height (96%～), bed interface defective are few, the deposit preform (pipe, ingot blank, slab etc.) of the big specification of suitable preparation, the material recovery rate increases substantially (85%～).
Embodiment
Provide embodiment in conjunction with content of the present invention, as shown in the table:
| Material | A356 | 7075 | 6061/10％(wt)SiCp |
| The alloy melt flow rate, kg/min | 10 | 15 | 6 |
| Superheating temperature, K | 150 | 200 | 100 |
| The alloy melt statical head, mm | 300 | 300 | 250 |
| The one-level atomizing pressure, atm | 2 | 1 | 3 |
| The one-level atomization angle, ° | 2 | 0 | 3 |
| The secondary atomizing pressure, atm | 10 | 15 | 6 |
| The secondary atomization angle, ° | 10 | 7 | 15 |
| Composite particles powder feeding pressure, atm | / | / | 3 |
| The deposition distance, mm | 450 | 500 | 400 |
| Pipe substrate speed of rotation, rpm | 100 | 160 | 60 |
| The substrate preheating temperature, ℃ | 560 | 610 | 510 |
| Voltage, V | 36 | 36 | 36 |
| Relative density, % | 98 | 96 | 96 |
| The pipe internal diameter, mm | 470 | 600 | 470 |
| Pipe thickness, mm | 40 | 40 | 40 |
| The material recovery rate, % | 86 | 88 | 85 |
| Solidification rate, K/s | 10 4 | 10 4 | 10 5 |
| The bed interface | Fine and close | Fine and close | Fine and close |
| Mean grain size, μ m | 9 | 10 | 0.9 |
| Tensile strength, MPa | 380 | 608 | 450 |
| Unit elongation, % | 11 | 22 | 12 |
Claims (4)
1, the reciprocal spray deposition processing of a kind of control, it is characterized in that, method is as follows: alloy melt enters the atomizing zone under action of gravity, adopt unrestricted formula, non-scanning, the secondary spraying gun, its working medium is the reactant gas of rare gas element or setting, alloy melt enters one-level atomizing zone under action of gravity, the one-level atomization pressure is at 1～3atm, atomizing angle is 0～3 °, the secondary atomization pressure is at 6～15atm, atomizing angle is 7～15 °, by spraying gun alloy melt is pulverized, form continuously intensive droplet jet and flow to the substrate deposition, the alloy liquid droplet of successive sedimentation fully fuses, rapid solidification, make the alloy atomization liquid droplet charged and in electric field, fly to substrate, automatically control exhaust outlet door opening angle, make the air pressure in the sediment chamber be controlled at 1～1.1atm, the agglutinating dust is not got rid of continuously by exhaust outlet, the flying distance of injection stream before depositing to substrate surface is in 400～500mm scope, atomised jet stream is with respect to the reciprocal tangential movement of substrate, settling is made up of reciprocal sedimentary multilayer, the initial preheating temperature of substrate is hanged down 50～150 ℃ than the solidus curve of alloy, deposit surface temperature and injection stream are respectively solidus curve ± 30 ℃ and more than the solidus curve 30～100 ℃ in presedimentary temperature range, for pipe, substrate is the core pipe of horizontal positioned, speed of rotation 60～160rpm, on-line Control to-and-fro movement and deposition distance, for ingot blank, substrate is a circular slab, speed of rotation is 80～150rpm, on-line Control up-and-down movement and to-and-fro movement, for slab, substrate is dull and stereotyped, on-line Control to-and-fro movement and deposition distance, the on-line Control processing parameter, all the time satisfy above-mentioned sedimentation state, eliminate the bed interface tissue defects that to-and-fro movement forms, keep form accuracy.
2, the reciprocal spray deposition processing of control according to claim 1, it is characterized in that, described alloy melt, 100～200 ℃ of insulations more than liquidus line, flow into the bottom pour ladle that is incubated at uniform temp by tundish then, melt height is greater than 250mm in the bottom pour ladle, the liquid level difference is less than 10mm up and down, melt flows into spraying gun via the conduit that is arranged on the bottom pour ladle bottom, liquid level is by position or weight sensor on-line measurement, automatically the control alloy is toppled over action, and the aluminium alloy melt mass flow rate is at 6～15kg/min.
3, the reciprocal spray deposition processing of control according to claim 1, it is characterized in that, describedly make liquid droplet charged and fly to substrate in electric field, is by applying the 36V direct current for alloy melt and substrate, make alloy liquid droplet all have electric charge, and fly towards the substrate of oppositely charged.
4, the reciprocal spray deposition processing of control according to claim 1 is characterized in that, has a branch of or a few bundle melt jet stream, adds particle and forms individual injection stream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031170668A CN1209217C (en) | 2003-05-22 | 2003-05-22 | Reciprocating jet control shaping technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031170668A CN1209217C (en) | 2003-05-22 | 2003-05-22 | Reciprocating jet control shaping technology |
Publications (2)
| Publication Number | Publication Date |
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| CN1472025A CN1472025A (en) | 2004-02-04 |
| CN1209217C true CN1209217C (en) | 2005-07-06 |
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| CNB031170668A Expired - Fee Related CN1209217C (en) | 2003-05-22 | 2003-05-22 | Reciprocating jet control shaping technology |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8891583B2 (en) | 2000-11-15 | 2014-11-18 | Ati Properties, Inc. | Refining and casting apparatus and method |
| CN100455696C (en) * | 2006-05-26 | 2009-01-28 | 哈尔滨工业大学 | Selective metal drop size spray-deposition method |
| BRPI0809581A2 (en) | 2007-03-30 | 2019-03-12 | Ati Properties Inc | melting furnace including filament-discharged ion plasma electron emitter |
| US8747956B2 (en) * | 2011-08-11 | 2014-06-10 | Ati Properties, Inc. | Processes, systems, and apparatus for forming products from atomized metals and alloys |
| CN103962558B (en) * | 2013-01-24 | 2016-07-27 | 宝山钢铁股份有限公司 | A kind of reaction-injection moulding prepares the method for composite pipe blank continuously |
| CN109047769B (en) * | 2018-09-29 | 2020-12-18 | 北京航科精机科技有限公司 | Method for additive precision forming of metal parts |
| CN113695573B (en) * | 2020-05-07 | 2023-05-02 | 昆山晶微新材料研究院有限公司 | Continuous liquid supply printing system and method for liquid metal 3D printing |
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Owner name: JIANGSU HAORAN SPRAY FORMING ALLOY CO., LTD. Free format text: FORMER OWNER: SHANGHAI JIAOTONG UNIV. Effective date: 20090710 |
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Effective date of registration: 20090710 Address after: Jiangsu Zhenjiang District East twelve Road, Dingmao, Zhenjiang high tech Industrial Park Patentee after: Jiangsu Haoran Spray Forming Alloy Co., Ltd. Address before: No. 1954, Huashan Road, Shanghai Patentee before: Shanghai Jiao Tong University |
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Granted publication date: 20050706 Termination date: 20180522 |