CN1453080A - Method of manufacturing large precise irregular pipe - Google Patents

Method of manufacturing large precise irregular pipe Download PDF

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Publication number
CN1453080A
CN1453080A CN 03128925 CN03128925A CN1453080A CN 1453080 A CN1453080 A CN 1453080A CN 03128925 CN03128925 CN 03128925 CN 03128925 A CN03128925 A CN 03128925A CN 1453080 A CN1453080 A CN 1453080A
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China
Prior art keywords
pipe
semi
solid
big specification
shaped pipe
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CN 03128925
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CN1218793C (en
Inventor
张豪
张捷
张荻
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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Priority to CN 03128925 priority Critical patent/CN1218793C/en
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Publication of CN1218793C publication Critical patent/CN1218793C/en
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Abstract

The present invention belongs to the field of metal and composite material. The manufacture of large precise irregular pipe includes two technological stages of jet molding and semi-solid forming. The jet molding stage includes preparing semi-solid slurry with jet molding apparatus forming stable and dense liquid drop jet of metal melt with non-limiting two-stage atomizer to atomize with high pressure gas, and depositing the jet onto the surface of substrate core pipe under optimized parameters control to form great-diameter and great-thickness pipe blank. The semi-solid forming stage includes the fast heating of the deposited pipe blank inside the inducing coil based on the set curve, elimination of scale and pressing into forming mold. The said technological process can produce large pipe with complicated shape, precise size and fine structure.

Description

The method for preparing big specification precision shaped pipe material
Technical field
The present invention relates to a kind of method for preparing tubing, the method for the big specification precision shaped pipe of particularly a kind of preparation of adopting spray deposition processing to carry out follow-up semi-solid-state shaping material belongs to field of compound material.
Background technology
Metallurgical industry publishing house in 1999 publish by thanking aquatic and " semi-solid-state metal process technology and application thereof " that Huang Shenghong writes introduced the semi-solid processing that can prepare accurate shaped piece, this technology can adopt the plastic force more much lower than conventional Plastic Forming to make the extremely product of complexity of shape.Compare with the conventional cast forming technology, the shape of semi-solid-state metal product is more accurate, it is meticulousr to organize, mechanical property is more superior.But the raw metal that is suitable for semi-solid-state shaping must have the feature of equiaxed grain structure under solid conditions, and its preparation method has mechanical mixing method, electromagnetic stirring method, strain-induced fusing activation technique, turbulence effect method, powder method and spray-up method.The shortcoming of mechanical mixing method mainly is to be difficult to evenly stir in whole stirring inside cavity, and adverse influence all can be brought to the semisolid strand to the pollution problem of semi-solid metal slurry in the etching problem of stirring vane and it.Electromagnetic stirring method is because the influence of the electromagnetic agitation degree of depth should not be produced the strand of diameter greater than 150mm.Strain-induced fusing activation technique production cost height, the strand diameter is littler.The tissue defects that turbulence effect method, powder method are obtained is many, should not carry out industrialization.If directly prepare big specification heterotype tubing from spray forming ingot, the semi-solid state metal rheological Path too long, temperature descends many, and is easy to produce turbulent flow, makes oxide inclusions entrain into tubing inside.Conventional spray forming process production cost height can't prepare the fine and close pipe of big thickness.Owing to emphasize cooldown rate, it is low to control reciprocal spray deposition processing production efficiency.Do not find directly to adopt the tubulose semi solid slurry in retrieval, especially the reaction-injection moulding semi solid slurry prepares the bibliographical information of big specification tubing.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of method for preparing big specification precision shaped pipe material is provided, the big specification pipe for preparing metal and particulate composite thereof by spray deposition processing, carry out semi-solid-state shaping then, make it prepare big specification, high-performance, precision shaped pipe material, the little problem of tubing specification that has solved reaction-injection moulding deposit preform simple shape in the above-mentioned background technology, produced the low and semi-solid-state shaping of big specification heavy wall pipe efficient.
The present invention is achieved by the following technical solutions, the inventive method is divided into two stages, be spray deposition processing stage and semi-solid-state shaping operation stage, specific as follows: the phase I adopts reaction-injection moulding to prepare semi solid slurry, metal bath forms stable and intensive drop injection stream by unrestricted formula secondary atomizer and gases at high pressure atomizing, there are optimum range in deposit surface temperature and injection stream in presedimentary physical state, the On-line Control technological parameter, all the time satisfy the optimal deposition state, injection stream is deposited on substrate core tube-surface, the preparation major diameter, big thickness pipe; Second stage is a semi-solid-state shaping, and according to the curve Fast Heating of setting, scale removal is pressed into shaping dies to the deposition pipe then in induction coil.
Below technology of the present invention is further described, particular content is as follows:
1, spray deposition processing, specific as follows:
Metal is 100~200 ℃ of insulations (being the degree of superheat) more than liquidus curve, flow into the bottom pour ladle that is incubated at uniform temp by tundish then, melt height is greater than 400mm in the bottom pour ladle, automatically the control metal is toppled over action, liquid fluctuating is less than 10mm, and melt flows into atomizer via the conduit that is installed in the bottom pour ladle bottom.The atomizing medium of unrestricted formula secondary atomizer is the reactant gas of inert gas or setting, aluminum metal melt quality flow rate 15kg/min~, under the gravity effect, enter one-level atomizing zone, the one-level atomization pressure is at 1~3atm, atomizing angle is 0 ℃.One-level atomizing make metal bath can be owing to the negative pressure turbulent flow plug nozzle, the stable secondary master zone that atomizes that enters.The secondary atomization pressure is at 8~15atm, and atomizing angle is 10~15 ℃.The metal bath atomizing forms stable and intensive drop injection stream, and the molten drop of continuous intensive deposition fully fuses, and rapid solidification (10 1~10 2K/s), there is not the primary granule border substantially in deposit preform mean grain size 20~50 μ m.Automatically control exhaust outlet door opening angle makes that gas pressure maintains 1~1.1atm in the settling chamber.Exhaust outlet has the discharge 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 cyclone separator, and the micro mist that solidifies fully in the air-flow does not deposit in deposit surface substantially.The flying distance of injection stream before depositing to substrate surface is 400~600mm, and atomized spray flows with respect to the reciprocal horizontal movement of substrate, and deposit is made up of the multilayer of reciprocal deposition.The initial preheat temperature of substrate is than low 50~150 ℃ of the solidus of metal, and deposit surface temperature and injection stream generally are respectively solidus-20~+ 10 ℃ and+20~+ 50 ℃ at presedimentary optimum temperature range.Substrate is the core pipe of horizontal positioned, rotary speed 60~100rpm, and On-line Control moves back and forth and the deposition distance, satisfies optimum deposition condition, and basic the elimination moves back and forth the bed boundary tissue defects that forms, and keeps form accuracy.The present invention allows to exist a few bundle melt jet streams, adds particle and can form individual injection stream.The spray deposition processing that the present invention relates to be applicable to the preparation internal diameter greater than 300mm, wall thickness greater than 40mm, length heavy wall pipe greater than 50mm.
2, semi-solid-state shaping technology, specific as follows:
The deposition pipe heats in induction coil, earlier before free state directly is heated to softening point, put into supporting mould then, by being continued to be warming up to the semi-solid-state shaping temperature by the heat transmission of direct-fired mould, determine a critical point for 20~30 ℃ at subsolidus, the heating rate that is lower than and is higher than critical point is respectively 8~12K/s and 1~3K/s, insulation 10~300s (it is fixed to look wall thickness and heat transfer condition).Because heat time heating time is of short duration, the grain growth of pipe is slight, and final mechanical property improves.Material or workpiece for oxidation-sensitive; adopt the reducing atmosphere protection in the heating process; scale removal then; semi solid slurry bottom band supports; be pressed into shaping dies; mold preheating temperature is decided on practical situation, mainly by the contingent temperature drop decision of metal flow process, generally in 150 ℃ of metal subsolidus.Semi solid slurry can adopt deposition pipe or ingot blank, and these two kinds of situations are compared, and the former metal flow is based on side direction, and the path is extremely short, and technological parameter allows fluctuation range wideer, is more suitable for big specification, thin-walled heterotype tubing.
The present invention has substantive distinguishing features and marked improvement, technology of the present invention has solved the problem that exists in the background technology, the beneficial effect that obtains is: reaction-injection moulding semi solid slurry density 99%~, thickness 40mm~, equiax crystal mean grain size 20~50 μ m, recovery rate 85%~, the production efficiency height (for aluminium alloy, 15kg/min~); The tubing specification of semi-solid-state shaping big (internal diameter 300mm~), shape are extremely complicated, size is accurate, it is meticulous to organize, and the metal flow path is short, and forming parameters allows mobility scale wide, are easy to stable control, and the product mechanical property is suitable with traditional forging.
The specific embodiment
Provide embodiment in conjunction with content of the present invention, as shown in the table:
Material ????A356 ????7075 ????6061/10%(wt)SiCp
The metal bath flow rate, kg/min ????15 ????30 ????20
The degree of superheat, K ????150 ????200 ????100
The metal bath hydrostatic head, mm ????400 ????450 ????400
The one-level atomizing pressure, atm ????2 ????1 ????3
The one-level atomization angle, ° ????2 ????0 ????3
The secondary atomizing pressure, atm ????10 ????15 ????8
The secondary atomization angle, ° ????12 ????10 ????15
Composite particles powder feeding pressure, atm ????/ ????/ ????3
The deposition distance, mm ????500 ????600 ????400
Pipe substrate rotary speed, rpm ????80 ????100 ????60
The substrate preheat temperature, ℃ ????560 ????610 ????510
Relative density, % ????99.5 ????99.3 ????99
The pipe internal diameter, mm ????300 ????600 ????470
Pipe thickness, mm ????60 ????40 ????80
The material recovery rate, % ????86 ????88 ????85
Freezing rate, K/s ????101 ????101 ????102
The bed boundary Fine and close Fine and close Fine and close
Mean grain size, μ m ????30 ????48 ????22
The semisolid heating-up temperature, ℃ ????600 ????600 ????600
Heating-up time, min ????30 ????20 ????25
Temperature retention time, s ????150 ????10 ????300
Semi-solid-state shaping pressure, MPa ????70 ????76 ????72
Hot strength, MPa ????340 ????560 ????380
Percentage elongation, % ????11 ????22 ????12

Claims (8)

1, a kind of method for preparing big specification precision shaped pipe material, it is characterized in that, method is divided into two stages, be spray deposition processing stage and semi-solid-state shaping operation stage, specific as follows: the phase I adopts reaction-injection moulding to prepare semi solid slurry, metal bath forms stable and intensive drop injection stream by unrestricted formula secondary atomizer and gases at high pressure atomizing, there are optimum range in deposit surface temperature and injection stream in presedimentary physical state, the On-line Control technological parameter, all the time satisfy the optimal deposition state, injection stream is deposited on substrate core tube-surface, the preparation major diameter, big thickness pipe; Second stage is a semi-solid-state shaping, and according to the curve Fast Heating of setting, scale removal is pressed into shaping dies to the deposition pipe then in induction coil.
2, the method for the big specification precision shaped pipe of preparation according to claim 1 material, it is characterized in that, the semi-solid-state shaping operation stage, the deposition pipe shifts into induction coil, according to the curve Fast Heating of setting, determine critical points 20~30 ℃ of subsolidus, be lower than and the heating rate that is higher than critical point is respectively 8~12K/s and 1~3K/s, reach temperature retention time 10~300s after the temperature.
3, the method for the big specification precision shaped pipe of preparation according to claim 1 and 2 material is characterized in that, the semi-solid-state shaping operation stage, reach the pipe scale removal of temperature after, the bottom band of semi solid slurry supports, and is pressed into shaping dies.
4, the method for the big specification precision shaped pipe of preparation according to claim 1 material, it is characterized in that, the spray deposition processing stage, described metal bath, 100~200 ℃ of insulations more than liquidus curve, flow into the bottom pour ladle that is incubated at uniform temp by tundish then, melt height is controlled metal automatically and is toppled over action greater than 400mm in the bottom pour ladle, and liquid fluctuating is less than 10mm, melt flows into atomizer via the conduit that is arranged on bottom pour ladle bottom, aluminum metal melt quality flow rate 15kg/min~.
5, according to the method for claim 1 or the big specification precision shaped pipe of 4 described preparations material, it is characterized in that, the spray deposition processing stage, described unrestricted formula secondary atomizer, its working media is the reactant gas of inert gas or setting, metal bath enters one-level atomizing zone under the gravity effect, the one-level atomization pressure is at 1~3atm, atomizing angle is 0~3 °, and the secondary atomization pressure is at 8~15atm, and atomizing angle is 10~15 °.
6, according to the method for claim 1 or the big specification precision shaped pipe of 4 described preparations material, it is characterized in that, the spray deposition processing stage, exhaust outlet has the discharge area that can regulate continuously, automatically control exhaust outlet door opening angle, the gas pressure in the settling chamber maintains 1~1.1atm, external explosion-proof fan, the air-flow of carrying dust secretly purifies the back emptying through one or more levels cyclone separator, and Nian Jie dust is not in time got rid of by exhaust outlet.
7, according to the method for claim 1 or 4 or the 5 or 6 big specification precision shaped pipe of described preparation materials, it is characterized in that, the spray deposition processing stage, the On-line Control technological parameter is specific as follows: the deposition distance of injection stream before depositing to substrate surface is 400~600mm, with respect to the reciprocal horizontal movement of substrate, substrate is the core pipe of horizontal positioned, rotary speed 60~100rpm, injection stream before deposition and the optimum temperature range of deposit surface be respectively solidus+20~+ 50 ℃ and-20~+ 10 ℃.
8, according to the method for claim 1 or 4 or the 5 or 6 big specification precision shaped pipe of described preparation materials, it is characterized in that, the spray deposition processing stage, there is a branch of or a few bundle melt jet stream, add particle or form individual injection stream.
CN 03128925 2003-05-29 2003-05-29 Method of manufacturing large precise irregular pipe Expired - Fee Related CN1218793C (en)

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Application Number Priority Date Filing Date Title
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CN1218793C CN1218793C (en) 2005-09-14

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009121290A1 (en) * 2008-03-31 2009-10-08 芬兰国家技术研究中心(Vtt) Exact spray forming and layer by layer compaction repairing and manufacturing equipment
CN101934370B (en) * 2009-06-29 2013-01-02 宝山钢铁股份有限公司 Process for preparing extra-thick or composite pipe blank by injection moulding and device thereof
CN104307923A (en) * 2014-08-27 2015-01-28 陕西新精密合金有限责任公司 Processing method for nickel iron low-carbon steel iron-nickel- cobalt alloy special pipe material
CN105921548A (en) * 2016-06-01 2016-09-07 陕西新精密合金有限责任公司 Machining method of special-shaped ferronickel low-carbon steel fernico pipe material
CN109093118A (en) * 2018-07-11 2018-12-28 林耀军 The equipment of injection forming quickly manufacturing mould and the method for manufacturing mold
CN109182850A (en) * 2018-09-25 2019-01-11 宁波市佳利来机械制造有限公司 A kind of preparation method of ultra-thin aluminum alloy back cover of motor
CN109290543A (en) * 2018-09-10 2019-02-01 佛山峰合精密喷射成形科技有限公司 A method of producing high-intensitive near net-shaped metal parts
CN111715723A (en) * 2020-06-07 2020-09-29 张英华 Production equipment and control method of high-temperature high-pressure seamless steel pipe

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009121290A1 (en) * 2008-03-31 2009-10-08 芬兰国家技术研究中心(Vtt) Exact spray forming and layer by layer compaction repairing and manufacturing equipment
CN101934370B (en) * 2009-06-29 2013-01-02 宝山钢铁股份有限公司 Process for preparing extra-thick or composite pipe blank by injection moulding and device thereof
CN104307923A (en) * 2014-08-27 2015-01-28 陕西新精密合金有限责任公司 Processing method for nickel iron low-carbon steel iron-nickel- cobalt alloy special pipe material
CN105921548A (en) * 2016-06-01 2016-09-07 陕西新精密合金有限责任公司 Machining method of special-shaped ferronickel low-carbon steel fernico pipe material
CN109093118A (en) * 2018-07-11 2018-12-28 林耀军 The equipment of injection forming quickly manufacturing mould and the method for manufacturing mold
CN109290543A (en) * 2018-09-10 2019-02-01 佛山峰合精密喷射成形科技有限公司 A method of producing high-intensitive near net-shaped metal parts
WO2020052528A1 (en) * 2018-09-10 2020-03-19 佛山峰合精密喷射成形科技有限公司 Method for producing high-strength near-net-shaped metal part
CN109182850A (en) * 2018-09-25 2019-01-11 宁波市佳利来机械制造有限公司 A kind of preparation method of ultra-thin aluminum alloy back cover of motor
CN111715723A (en) * 2020-06-07 2020-09-29 张英华 Production equipment and control method of high-temperature high-pressure seamless steel pipe

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