CN100519008C - Technique method for improving density of injection molding high-speed steel columnar deposition blank - Google Patents

Technique method for improving density of injection molding high-speed steel columnar deposition blank Download PDF

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CN100519008C
CN100519008C CNB2007101984099A CN200710198409A CN100519008C CN 100519008 C CN100519008 C CN 100519008C CN B2007101984099 A CNB2007101984099 A CN B2007101984099A CN 200710198409 A CN200710198409 A CN 200710198409A CN 100519008 C CN100519008 C CN 100519008C
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speed steel
speed
spray
sediment
blank
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CN101185971A (en
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张国庆
张勇
李周
李正栋
袁华
许文勇
刘娜
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Beijing Institute of Aeronautical Materials China Aviation Industry No 1 Group Corp
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Beijing Institute of Aeronautical Materials China Aviation Industry No 1 Group Corp
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Abstract

The invention relates to a technique method used for raising the density of a steel-column shaped sediment blank of a spray-forming high-speed tool and belongs to the technical field of material processing. The invention thoroughly combines the theory idea and the technical advantage of spray-forming and heat-control concretion. In an early phase of the spray sediment process, the advantages of the spray-forming that an equiaxed grain (less than 20Mum) having no segregation but a uniform and thin structure can be manufactured in a short process can be performed, and then the manufactured high-speed steel sediment blank has high strength, better plasticity and easy-forging capability. In a later phase of the sediment process, i.e. after the spray-forming is finished, the structure of a main body of equipment (such as a tundish and an atomizing sprayer, etc.) is adopted to control output and radiation of the heat. The invention enhances solidification of easy-loosening part of the high-speed steel sediment blank, so as to manufacture high quality and high density sediment blank. The technique not only can solve the segregation of the high-speed steel but also further enhance the density of the sediment blank to guarantee a following smooth process of fine-forging, etc.

Description

A kind of process that improves density of injection molding high-speed steel columnar deposition blank
Technical field
The invention belongs to material processing field, relate to a kind of process that improves reaction-injection moulding high-speed tool steel columnar deposition blank density.
Background technology
The background technology of this technology is spray forming technology and thermal control solidification theory.
Reaction-injection moulding (Spray Forming) is that the quick setting method that utilizes that developed recently gets up prepares the advanced technologies of high performance material, this technology logging material-technology-part is in one, not only preparation cost is low, and can obtain the interior tissue of the tiny and segregation-free of crystal grain, the new way of having opened up a preparation advanced material.At present, belong to difficult-to-machine material at the widely used high temperature alloy of high-tech area, titanium alloy, unimach etc., and the parts size precision to preparation requires high, make very tight to the performance requirement of cutter (comprising hobboing cutter, milling cutter, pinion cutter and broaching tool etc.), therefore, develop high-grade tool die material by reaction-injection moulding, become the key that promotes China's processing and manufacturing level.
The technological principle of reaction-injection moulding is; under protective atmospheres such as inert gas; adopt gases at high pressure that motlten metal is broken into tiny metal drop; the atomizing molten drop in flight course by heat transfer type generation heat exchanges such as convection current and radiation; what the generation degree was different solidifies, and the molten drop high-speed impact depositor surface of these partial coagulations is in the depositor surface attachment, sprawl (distortion or broken), pile up; progressively grow up into the bulk metal deposit preform, base substrate is carried out following process can obtain final products.Compare with common tool die material preparation method, spray deposition processing with short flow process characteristics has incomparable advantage, adopt this method to prepare high-speed steel, not only eliminated the carbide segregation problem of material internal, and preparation section still less, obviously reduce production cost, had great economic benefit.
But, although reaction-injection moulding has solved the shortcoming of high-speed steel segregation and powder metallurgical technique complex procedures, also bring other problem, mainly be to spray in the preparation process at high-speed steel, because the influence of factors such as being conducted heat, atomize, solidify, add the alloying level height, the freezing range is big, influence feeding, be easy to cause local microporosity in base substrate inside, and the deposit preform size is big more, and it is serious more to produce loose tendency, and these innerly loosely bring the ten minutes adverse influence for the use of follow-up forging rolling processing of high-speed steel and cutter.So, make spray forming high-speed steel be able to extensive use, at first must prepare the reaction-injection moulding deposit preform of even tissue densification.Studies show that the PM HSS cutter only reaches 98% solid density could be used when above, and while with the raising of the compactness extent of material own, the Tool in Cutting life-span can significantly increase.Therefore, it is significant to improve the volume density of spray forming high-speed steel deposit preform by the technology approach.Yet domestic present research for the reaction-injection moulding high-speed tool steel also is in the starting stage.
The graduate Zhang Jingguo of Shanghai Baosteel etc. has proposed a patent (application number: 200410024855.4), promptly make high-vanadium, high-cobalt high speed steel obtain the method for superplastic ability by spray deposition processing.Their actual tests result shows that high carbon high-speed steel is by behind the reaction-injection moulding, and the effect that plasticity improves is fairly obvious, and the high-speed steel for preparing than conventional ingot casting forging rolling technology improves more than 100%.Germany EWK company studies show that spray forming high-speed steel has high clarity and favorable tissue uniformity, makes its intensity substantially exceed conventional tool steel near spherical equally distributed carbide.
The thermal control solidification technology is exactly that input by control temperature or heat is limited in the temperature range of solidus and liquidus curve with casting solidification process, to obtain flawless arborescent structure.This technology is proposed by U.S. PCC company, is mainly used in the preparation of the large size, thin walled member of complicated shape in the Aero-Space engine at present.Because its unique thermal control solidification mode, what well solved foundry goods fills difficult problems such as type, feeding and strain cracking, have very high using value, but the details of this technology holds externally in close confidence.However, the process thought that solidifies of thermal control also provides a new thinking for the metallurgical problems such as loose that solves reaction-injection moulding high-speed tool steel deposit preform inside.
Summary of the invention
The object of the present invention is to provide a kind of process that improves the injection molding high-speed steel columnar deposition blank volume density.
Technical scheme of the present invention is:
(1) selects a kind of high-speed steel foundry alloy material;
(2) vaccum sensitive stove of high-speed steel foundry alloy material being put into spray deposition equipment working chamber is heated above 100~250 ℃ of alloy melting points;
(3) insulation 10~20min makes the composition and the temperature of high-speed steel melt in the induction furnace reach uniformity, then the high-speed steel melt is poured in the heated tundish according to the speed of 1~3Kg/min, and tundish temperature is higher than 100~200 ℃ of high-speed steel fusing points;
(4) in spray chamber, be 2~3MPa with pressure, purity〉N of 99.9%wt 2Gas is atomized into molten drop to the high-speed steel melt that flows out from mozzle by atomizer, and molten drop flight also is deposited on formation columnar deposition base on the depositor of 50~90 rev/mins of speed rotations;
(5) after spray deposition was finished, it was 50~100mm to the distance of atomizer that the rising depositor makes deposit preform, kept deposit preform rotating at a high speed on the depositor and keeping between deposit preform and the nozzle apart from constant simultaneously;
(6) continuing charged pressure in the working chamber is 0.2~0.3MPa, purity〉N of 99.9%wt 2Gas, N when flowing through tundish 2Gas is heated to about 800~1000 ℃, N 2Gas is through the mozzle nozzle, blows near the high-speed steel columnar deposition base top center with 10~80L/min flow velocity, behind winding-up 1~2min; Reduce depositor, and reduce N with 2~4L/min 2Pressure is controlled deposit preform top surface rate of temperature fall<5 ℃/min simultaneously, after the distance of depositor and atomizer is lower than 700 ℃ greater than 300mm and billet surface temperature, stops temperature control, cools off with stove.
Advantageous effect of the present invention: theoretical thought and technical advantage that the present invention is fully solidified in conjunction with reaction-injection moulding and thermal control.In the last stage of Models of Spray Deposition, brought into play the advantage that reaction-injection moulding can be lacked flow preparation segregation-free, even tissue and tiny equiax crystal (<20 μ m), make the high-speed steel deposit preform intensity height of producing, plasticity is good, easily forging rolling processing; After-stage in deposition process, be after reaction-injection moulding is finished, directly control heat input and lost, improve solidifying of the easy porous spot of high-speed steel deposit preform, thereby prepare the highdensity deposit preform of high-quality by the structure (as tundish, atomizer etc.) of equipment itself.This technology has not only solved the segregation problem of high-speed steel, and has further improved the deposit preform density, guarantees carrying out smoothly of processing such as follow-up finish forge.
Maximum characteristics of the present invention are to combine the know-why that reaction-injection moulding and thermal control are solidified, and it is tiny and do not have the interior tissue of gross segregation not only to obtain crystal grain, and have reduced the pore of deposit preform inside and loose, the service life of having improved high-speed steel.In addition, if in conjunction with finish forge or high temperature insostatic pressing (HIP) processing, can realize the novel high speed steel of abbreviated system production performance excellence fully.
The specific embodiment
(1) selects a kind of high-speed steel foundry alloy material;
(2) vaccum sensitive stove of high-speed steel foundry alloy material being put into spray deposition equipment working chamber is heated above 100~250 ℃ of alloy melting points;
(3) insulation 10~20min makes the composition and the temperature of high-speed steel melt in the induction furnace reach uniformity, then the high-speed steel melt is poured in the heated tundish according to the speed of 1~3Kg/min, and tundish temperature is higher than 100~200 ℃ of high-speed steel fusing points;
(4) in spray chamber, adopt the N of 2~3MPa by atomizer 2(purity〉99.9%wt), the high-speed steel melt that flows out from mozzle is atomized into molten drop, molten drop flight also is deposited on formation columnar deposition base on the depositor of 50~90 rev/mins of speed rotations;
(5) after spray deposition was finished, it was 50~100mm to the distance of atomizer that the rising depositor makes deposit preform, kept deposit preform rotating at a high speed on the depositor and keeping between deposit preform and the nozzle apart from constant simultaneously;
(6) continuing charged pressure in the working chamber is the N of 0.2~0.3MPa 2(purity〉99.9%wt), N when flowing through tundish 2Be heated to about 800~1000 ℃, N 2Through the mozzle nozzle, blow near the high-speed steel columnar deposition base top center with 10~80L/min flow velocity, behind winding-up 1~2min; Reduce depositor, and reduce N with 2~4L/min 2Pressure is controlled deposit preform top surface rate of temperature fall<5 ℃/min simultaneously, after the distance of depositor and atomizer is lower than 700 ℃ greater than 300mm and billet surface temperature, stops temperature control, cools off with stove.
High-alloying material columnar deposition base is last solidify the zone overwhelming majority in the base substrate center position on the upper side, the hottest place when cooling off naturally corresponding to base substrate, this place's setting rate is the slowest, yet by contrast, the superficial layer cooling of deposit preform is very fast, adds the reason that cooling is shunk, and causes the part residual gas to converge to the final set zone, be position on the upper side, base substrate center, form local loose.By controlling the cooling of porous spot targetedly, obviously can promote feeding, improve blank density.
Embodiment one
The high-speed steel foundry alloy material composition that adopts is (wt%): C 1.5; W 12.3; Co 4.66; V 5.2; Cr 4.16; Mo 0.22; Surplus Fe.
The main operating process of reaction-injection moulding is: high-speed tool steel foundry alloy material is put into vaccum sensitive stove, heating and fusing; Be incubated 10min being higher than under the about 180 ℃ of temperature of alloy melting point, make the composition and the temperature of high-speed steel melt in the induction furnace reach uniformity; The high-speed steel melt is slowly poured in the heated tundish according to certain speed, and tundish temperature is higher than high-speed steel fusing point~100 ℃.In spray chamber, adopt the high pressure high-purity N by atomizer 2The high-speed steel melt that flows out from mozzle is atomized into tiny molten drop, wherein atomizing N 2The about 2.4MPa of pressure, the about 350mm of jet length, gas/melt (G/M) is than about 0.4m 3/ Kg.A large amount of molten drop flights also are deposited on the depositor that rotates according to certain speed, finally form the columnar deposition base.
Control heat input and cooling: after spray deposition was finished, the deposit preform that raises charged into high-purity N to the distance D ≈ 100mm at atomizer place in the working chamber at once 2The about 0.2MPa of pressure, at a high speed rotation and D value are constant on depositor to keep deposit preform simultaneously, N 2Blow to the centre at high-speed steel columnar deposition base top according to certain flow rate through the nozzle place of mozzle.N 2Be heated to about 1000 ℃ when flowing through tundish, this temperature is near the first fusing point of high-speed steel.High-purity N 2Behind the about 2min of stream winding-up, according to the speed of 10mm/min slowly descend deposit preform and slow reduction N 2Pressure, control deposit preform top surface rate of temperature fall<5 ℃/min after the billet surface temperature is lower than 700 ℃, cools off with stove.

Claims (1)

1. process that improves density of injection molding high-speed steel columnar deposition blank, its method step is:
(1) selects a kind of high-speed steel foundry alloy material;
(2) vaccum sensitive stove of high-speed steel foundry alloy material being put into spray deposition equipment working chamber is heated above 100~250 ℃ of alloy melting points;
(3) insulation 10~20min makes the composition and the temperature of high-speed steel melt in the induction furnace reach uniformity, then the high-speed steel melt is poured in the heated tundish according to the speed of 1~3Kg/min, and tundish temperature is higher than 100~200 ℃ of high-speed steel fusing points;
(4) in spray chamber, be 2~3MPa with pressure, purity〉N of 99.9%wt 2Gas is atomized into molten drop to the high-speed steel melt that flows out from mozzle by atomizer, and molten drop flight also is deposited on formation columnar deposition base on the depositor of 50~90 rev/mins of speed rotations;
(5) after spray deposition was finished, it was 50~100mm to the distance of atomizer that the rising depositor makes deposit preform, kept deposit preform rotating at a high speed on the depositor and keeping between deposit preform and the nozzle apart from constant simultaneously;
(6) continuing charged pressure in the working chamber is 0.2~0.3MPa, purity〉N of 99.9%wt 2Gas, N when flowing through tundish 2Gas is heated to 800~1000 ℃, N 2Gas is through the mozzle nozzle, blows near the high-speed steel columnar deposition base top center with 10~80L/min flow velocity, behind winding-up 1~2min; Reduce depositor, and reduce N with 2~4L/min 2Pressure is controlled deposit preform top surface rate of temperature fall<5 ℃/min simultaneously, after the distance of depositor and atomizer is lower than 700 ℃ greater than 300mm and billet surface temperature, stops temperature control, cools off with stove.
CNB2007101984099A 2007-12-11 2007-12-11 Technique method for improving density of injection molding high-speed steel columnar deposition blank Active CN100519008C (en)

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101559490B (en) * 2009-04-17 2011-01-05 中国航空工业第一集团公司北京航空材料研究院 Method for preparing double-scanning and spray forming high-speed steel under purification
CN101838774A (en) * 2010-05-10 2010-09-22 金文平 High speed steel and productive technology thereof
CN102873329B (en) * 2012-10-12 2014-04-09 中国航空工业集团公司北京航空材料研究院 Method for preparing large-size high-vanadium die steel by spray forming process
CN103302293B (en) * 2013-05-24 2014-12-17 淮海工学院 Spray deposition densifying device and application thereof
CN103495711A (en) * 2013-09-18 2014-01-08 沈阳工业大学 Deposition device capable of horizontally moving back and forth
CN103924129B (en) * 2014-04-16 2016-05-18 同济大学 A kind of rapid solidification aluminum alloy materials and preparation method thereof

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
喷射成形沉积坯组织性能分析. 王爱敏等.包头钢铁学院学报,第24卷第3期. 2005
喷射成形沉积坯组织性能分析. 王爱敏等.包头钢铁学院学报,第24卷第3期. 2005 *
热等静压对喷射成形高温合金组织和性能的影响. 梁志凯等.材料工程,第7期. 1996
热等静压对喷射成形高温合金组织和性能的影响. 梁志凯等.材料工程,第7期. 1996 *

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