CN100482404C - Technique for processing tin bronze valve body and tube union - Google Patents
Technique for processing tin bronze valve body and tube union Download PDFInfo
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- CN100482404C CN100482404C CNB2007100713600A CN200710071360A CN100482404C CN 100482404 C CN100482404 C CN 100482404C CN B2007100713600 A CNB2007100713600 A CN B2007100713600A CN 200710071360 A CN200710071360 A CN 200710071360A CN 100482404 C CN100482404 C CN 100482404C
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Abstract
The present invention discloses a processing technique of a tin bronze valve body and a pipe joint which comprises a modification processing of tin bronze, extruding and forging of the unburnt earthenware, forging and so on. The tin bronze is metamorphosed and modified by the present invention by adding rare earth to purify and RE-Li-Bi alloy composite modifier to refine the crystal grain and improves the scalability of bronze and addresses the tin bronze sealing problem. The forging of an unburnt earthenware piece is a technique which is light and fast at the beginning, heavy and slow in the middle and is formed by tapping in the brittle region. The processes of forging the original unburnt earthenware, extruding the unburnt earthenware, forging the tin bronze valve body and producing a pipe joint are integrated; the work which needed a plurality of months at the beginning is capable of being integrated and finished in a production cycle, so the processing accuracy is increased; the process is simplified; the production efficiency is improved and the production cost is reduced. The present invention is mainly used for the bronze valve which is provided with the dimension of 3/8 inches to 4 inches and the series components for forging the pipe joint.
Description
[technical field]
The present invention relates to tin bronze alloys spare, relate in particular to the processing technology of tin bronze valve body, pipe joint.
[background technology]
Having only brass to be suitable for die casting in the copper alloy, mainly is that the fusing point of brass is lower, and the metacollid of alloy is little, helps overcoming owing to cool off the stress that solidifies that forms fast, and the price of zinc is low more than Cu, Al in addition, and the source of goods is abundant, so cost is low.Zn solid solubility in copper is also big, helps intensity and hardness and improves.Press casting copper alloy generally is used for making higher, anti-corrosion, the wear-resisting member of elevated temperature strength, and is as water pipe head, automobile shift fork, label, door lock, furniture part, applicator etc., wherein domestic with YZCuZn
16Si
4It is more that brastil is used, the adding of Al and Si helps to reduce the oxidation of alloy, improve the processing performance of alloy, casting qualified rate is higher, press casting copper alloy is because its smelting equipment has specific (special) requirements, and power consumption is big, adds that the copper alloy die casting die material is special, life-span is short, so domestic development is subjected to certain limitation.
No matter tin bronze in atmosphere, steam, fresh water or seawater and alkaline solution, all has very high chemical stability, therefore, and the extremely favor of valve manufacturing.Valve is as a kind of auxiliary equipment of controlling fluid media (medium), be widely used in national economy all departments such as oil, boats and ships, chemical industry, metallurgy, electric power, weaving, light industry, machine-building, building, defence and military, indispensable control appliance in the fluid means in having become.
Because tin bronze at general condition, under the sand casting condition, is difficult to obtain the good foundry goods of compactness especially, like this, the air-tightness problem just becomes the bottleneck that tin bronze further plays a role in this field.
The forming mode of valve body, pipe joint mainly is casting at present, wherein take as the leading factor with precision castings especially, but die-cast product performance, reliability, yield rate, stock utilization and capacity of equipment etc. all are restricted, and can't satisfy the requirement of high performance structural member in the fields such as aviation, military project.
[summary of the invention]
Purpose of the present invention solves the problems of the prior art exactly, proposes the processing technology of a kind of tin bronze valve body, pipe joint, can solve the air-tightness problem of tin bronze, improves machining accuracy, and can simplify technology, enhances productivity, and reduces production costs.
For achieving the above object, the present invention proposes the processing technology of a kind of tin bronze valve body, pipe joint, in turn include the following steps:
The tin bronze modification is handled: earlier reinforced melting, and refining treatment is handled with the alterant modification again, cast then, and start oscillator and carry out continuous casting and draw ingot to obtain strand;
Extruding forging stock: use N
2Or Ar gas is got rid of the air in the extrusion die die cavity, prevent that copper alloy liquid from producing oxidation and be mingled with in the extrusion molding flow process, adopting squeeze pack speed is 2.0～2.5m/s, extrusion ratio is 100～400, extruding force is 500kN～100MN, and extruding obtains the copper alloy squeeze casting of dense structure; The extrusion piston of extrusion die and demand chamber sprue bush are provided with independently heater, and heating-up temperature is 400-460 ℃, and the monolateral between the two fit clearance of extrusion piston and demand chamber sprue bush is 0.02-0.05mm;
Forge: want light and fast when just forging, will weigh during middle the forging and slow, and in the brittle zone, rap shaping.
As preferably, be fed to melting in the intermediate frequency furnace in the described tin bronze modification processing, should melt as early as possible, it is overheated to prevent, after the furnace charge fusing, carries out refining treatment, be warmed up to 1050 ℃ again, carry out the P-Cu deoxidation, again after the skimming, add lead and tin, be warmed up to 150 ℃ again, carry out composite refining, add the RE-Li-Bi alterant, be warmed up to the 1150-1250 ℃ of processing of going bad after leaving standstill, adjust temperature then and pour into a mould, and start oscillator and carry out continuous casting and draw ingot to obtain strand.
As preferably, Sn:2wt%-6wt% in the strand that described tin bronze modification obtains in handling; Zn:3wt%-6wt%; Pb:1wt%-5wt%; Re:0.03wt%-0.25wt%; Cu:80wt%-96wt%.
As preferably, extruding is adopted and is added warm extrusion in the described extruding forging stock, during 2wt%＜Sn≤3wt%, adopts 780 ℃-880 ℃ extrusion temperature; During 3wt%＜Sn≤5wt%, adopt 650 ℃-780 ℃ extrusion temperature; During 5wt%＜Sn≤6wt%, adopt 600 ℃-740 ℃ extrusion temperature.
As preferably, push in the described extruding forging stock and adopt the normal temperature cold-extruded.
As preferably, described forging is adopted and is added warm forging, during 2wt%＜Sn≤3wt%, adopts 780 ℃-880 ℃ forging temperature; During 3wt%＜Sn≤5wt%, adopt 650 ℃-780 ℃ forging temperature; During 5wt%＜Sn≤6wt%, adopt 460 ℃-650 ℃ forging temperature.
As preferably, the normal temperature cold forging is adopted in described forging.
Beneficial effect of the present invention: the present invention to tin bronze the modification of going bad handle, add that rare earth purifies, RE-Li-Bi alloy composite modifier, refinement crystal grain, improved the extension performance of tin bronze, solved the air-tightness problem of tin bronze.Heavy and technology slow, that in the brittle zone, rap shaping during light and fast, the middle forging when forging of blank is implemented just to forge.To cast former base, extruding forging stock, forge tin bronze valve body, pipe joint product collection is an one, the work that several technical process of former need are finished is finished among being integrated in a production cycle, has improved machining accuracy, has simplified technology, improve production efficiency, reduced production cost.
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 is a process chart of the present invention.
[specific embodiment]
As shown in Figure 1, the processing technology of high-strength high-tractility magnesium alloy member comprises three steps such as tin bronze modification processing 1, extruding forging stock 2, forging 3 successively.
Prepare burden for the raw alloy composition proportion with the red copper, earlier raw material are added smelting furnace during molten alloy, and then the charcoal after the adding calcination processing makes alloy and air isolated as protective agent.Wherein, the charcoal overburden cover is 50 ~ 70mm.Alloy material is heated to 600 ℃ afterwards, make it in smelting furnace, be incubated 30min, continue to be warming up to 900 ℃ then, alloy is heated to 1150 ℃ at last again, takes liquid level slag and charcoal off, add about 0.1% phosphor-copper, use the graphite rod agitation molten pool, add charcoal and be warming up to 1200 ℃, insulation 30min prepares continuous casting.
When furnace heats during to 900-950 ℃, alloy is about to fusing, begin to heat crystallizer this moment, make it be heated to 600 ℃, can begin continuous casting behind the insulation 15min, during the beginning continuous casting, because bleedout alloy melt phenomenon may occur, so throwing speed can only reach 20cm/min, along with the stable of continuous casting carries out, throwing speed can be increased to 30 ~ 40cm/min.
The tin bronze modification handles 1: earlier reinforced melting, and refining treatment is handled with the alterant modification again, cast then, and start oscillator and carry out continuous casting and draw ingot to obtain strand; Specifically be to be fed to melting in the intermediate frequency furnace, should melt as early as possible that it is overheated to prevent, after the furnace charge fusing, carry out refining treatment, be warmed up to 1050 ℃ again, carry out the P-Cu deoxidation, after the skimming, add lead and tin again, be warmed up to 150 ℃ again, carry out composite refining, add the RE-Li-Bi alterant, be warmed up to the 1150-1250 ℃ of processing of going bad after leaving standstill, adjust temperature then and pour into a mould, and start oscillator and carry out continuous casting and draw ingot to obtain strand.
(1) batching.According to the alloy designations of foundry goods specification requirement defined, can find the chemical composition scope of alloy, therefrom selected chemical composition; With zinc, cathode copper, foundry returns, according to chemical composition calculate copper scaling loss 3%, zinc scaling loss 5%, tin scaling loss 4%, plumbous scaling loss 2%;
(2) furnace charge is handled burn out rate and the composition requirement according to element, carries out burdening calculation, draws the addition of various furnace charges, and selects furnace charge.If furnace charge is polluted, then need to handle, guarantee all furnace charge cleanings, rustless, and before feeding intake, carry out preheating;
(3) prepare.Check and the preparationization apparatus that brushing paint, and preheating prevent the pollution of gas, field trash and harmful element;
(4) reinforced.Be fed to melting in the intermediate frequency furnace, reinforced foundry returns → zinc → cathode copper → fusing → coverture in proper order.For the pollution of the air-breathing and oxidation that reduces alloy liquid, should melt as early as possible, it is overheated to prevent, and as required, the alloy liquid that has must add the coverture protection
(5) allotment composition.After the furnace charge fusing, carry out refining treatment,, and carry out the check of refining effect with purification alloy liquid; As required, carry out and segment tissue treatment improving performance, and the check treatment effect; 1050 ℃ → P-Cu deoxidation → skimming → lead → tin heats up;
(6) refining is with rotten.1150 ℃ → composite refining → RE-Li-Bi alterant → leave standstill → heat up 1150 ~ 1250 ℃ heats up
(7) if both analysis composition is the defective tie element that then adds.
(8) come out of the stove.Adjust temperature, pour into a mould.The alloy that has will stir before cast, in case gravity segregation takes place.
(9) starting oscillator carries out continuous casting and draws ingot.Alloy melt is imposed mechanical oscillation and stirs to promote the forming core of melt, and destroy established dendrite, become free crystal, nucleus quantity is increased, can also strengthen the conductive process in the melt, eliminate component segregation, improve the nucleation rate of copper alloy, suppress growing up of nucleus and remarkable crystal grain thinning.
Find in the practice, the tin bronze chemical composition that original casting and forging are recommended is difficult to finish forging (extruding) valve body, the requirement of pipe joint, do not meet simultaneously the convention that use the tin bronze chemical composition in Europe yet, for satisfying the requirement of the two simultaneously, (extruding) copper alloy chemistry composition is forged in the improvement that proposes Sn:2 ~ 6wt%Zn3 ~ 6wt%Pb:1 ~ 5w%tRe:0.03 ~ 0.25wt%Re:0.03 ~ 0.25wt%Cu:80 ~ 96wt%, 1150 ~ 1250 ℃ of pouring temperatures, the change of microstructure is mainly started with from technology, takes following measure crystal grain thinning to improve percentage elongation.
(1) rare earth (RE) purification, RE-Li-Bi alloy composite inoculating
The rare earth strong oxidizer is copper and the splendid cleanser of copper alloy melt, and deoxidizing capacity is only second to calcium, product Heat stability is good and easy come-up; Rare earth also has dehydrogenation, forms rare earth hydride such as LaH etc. with hydrogen, reduces gas and is mingled with the purification alloy, form high melting compound with Pb, Sb, Bi, P, eliminate the harm of Sb, the two-phase section temperature range narrows down, increase external nucleus, refining grain size improves foundry goods compactness.
Bismuth improves alloy flowability, uses with RE, P are collaborative, not only can eliminate its illeffects, can also increase nucleus quantity, and the effect, particularly Bi of playing rotten melt are expanded when solidifying, and help feeding, improve foundry goods compactness.
The lithium surface-active is extremely strong, is good deoxidier (Li
2O), dehydrogenating agent (LiOH), consumption ≯ 0.03% excessively then can be inhaled hydrogen.Lithium can optionally be adsorbed on the nucleus face, reduces the coarsening rate at lattice interface, helps the formation of equiax crystal.Crystal grain thinning improves compactness.
(2) coverture adds the prevention oxidation and exhales H-H reaction, the further dehydrogenation of composite refiner, deoxidation, decontamination.
Isolated copper alloy of coverture or charcoal layer and air duct.
Refining agent is formed by combining by powdery rare earth, bismuth meal, graphite powder.With inert gas Ar, N
2Be carrier, with the ground flux of drying, with centrifugal rotary blowing method be blown into the molten bath end of far from about 50～100mm place, substantially improve the contact conditions of flux and melt, improve concise degassing efficiency, the winding-up graphite powder can effectively be removed the oxygen in the melt.After treatment, hydrogen content can from 3ml/100g reduces to≤0.2ml/100g, far below the solubility of hydrogen under the melting temperature in solid-state copper.Oxygen is from 5.0 * 10
-3About drop to≤2.2 * 10
-5
(3) vibration crystallization and purification
Startup oscillator (mechanical oscillation, electromagnetic viscosimeter) carries out continuous casting and draws ingot.The basic principle that electromagnetic purification is handled is: a kind of process unit is set, liquid metal is in a kind of magnetic field, and allow liquid metal itself have electric current, liquid metal just becomes the current that is among the magnetic field like this.Current and magnetic field interaction, liquid metal and field trash all are subjected to electromagnetic force, but owing to resistivity between field trash and the liquid metal differs greatly, their suffered electromagnetic forces also differ greatly, thereby just can impel both to separate, and inclusion floating is removed.
In the tin bronze, plumbous effect: plumbous hardness is very low, lubricates.It both had been insoluble in alloy and had formed solid solution in the copper, did not also form new compound, but existed with the form of independent phase.When lead was evenly distributed on the matrix with tiny dispersed particles, the graphite in cast iron had good self-lubricating function, can reduce the coefficient of friction of alloy, thereby had improved the wearability of alloy significantly.
The effect of tin: with the increase of tin content, because the solution strengthening effect of tin in copper increases tensile strength of alloys and percentage elongation to some extent.The stanniferous amount is crossed when hanging down, and is then less as the δ phase amount of hard point, thereby alloy is not wear-resistant; If stanniferous amount hardness height, then foundry goods fragility is big, hardness is high, thereby causes coefficient of friction to increase; The stanniferous amount is too high in addition, and casting cost also can increase.
The effect of cerium: in tin bronze, add as-cast structure, homogenising tissue and the recrystallization annealing tissue of cerium energy refinement alloy, significantly improve the microscopic structure and the mechanical property of alloy.In addition, cerium can purify alloy, eliminates objectionable impurities, and extension property increases.
Extruding forging stock 2: use N
2Or Ar gas is got rid of the air in the extrusion die die cavity, prevent that copper alloy liquid from producing oxidation and be mingled with in the extrusion molding flow process, adopting squeeze pack speed is 2.0～2.5m/s, extrusion ratio is 100～400, extruding force is 500kN～100MN, and extruding obtains the copper alloy squeeze casting of dense structure; The extrusion piston of extrusion die and demand chamber sprue bush are provided with independently heater, and heating-up temperature is 400-460 ℃, and the monolateral between the two fit clearance of extrusion piston and demand chamber sprue bush is 0.02-0.05mm.
(1) metal is in steady flow stage (basic compression stage)
This moment stress and jumping-up stage have bigger different, comprise that container wall, the mould conical surface and calibrating strap act on normal pressure and the frictional force on the metal, and extrusion axis acts on extruding force on the metal by pad.
(2) calibrating strap length
When the selection of calibrating strap length is reasonable, after once pushing, can obtain than the also smooth extruded product in mould calibrating strap surface.Its reason is that in fact even thin the and stable metal film that is adhered to has played the effect that improves the calibrating strap smoothness.When the length of calibrating strap was 2 ~ 3mm, striped was the thinnest.This result is consistent with following result of the test.Promptly when sizing purpose length changed (greater than 3mm), the length of the thin and stable adhesive film that forms on the nib entrance side calibrating strap but remained unchanged substantially, is about about 2 ~ 3mm.
(3) hot extrusion
The sclerosis that metal produces in deformation process can be by crystallization is softening again.But thisly softening need adequate time to carry out, when extrusion speed increases, softeningly have little time to carry out, cause resistance of deformation to increase, make the extruding force increase.When extrusion temperature was 450 ℃, striped was the thinnest, and surface accuracy is the highest.
(4) common deficiency
Structural heterogenity
Inhomogeneities appears in being organized on the section He on the length of forging stock of extruding, mainly owing to inhomogeneous deformation causes.According to the analysis of extrusion flow dynamic deformation characteristics as can be known, on the forging stock section, because outer layer metal is subjected to mold shape constraint and frictional resistance effect in extrusion process, make outer layer metal mainly bear detrusion, and the practical distortion degree of metal is inwardly reduced gradually by skin generally speaking, so the inhomogeneities of tissue can occur on extruding forging stock section; On forging stock length, be that the additional detrusion degree of being born increases gradually because the effect of mold shape constraint and external friction increases the metal flow inhomogeneities gradually equally.Make crystal grain increased gradually to the back-end by the front end of forging stock by broken degree from face, cause the tissue odds on the forging stock length even.
Causing another factor of extruding forging stock structural heterogenity is the variation of extrusion temperature and speed.Generally not high in extrusion ratio, under the extremely slow situation of extrusion speed, blank time of staying in recipient is long, and plastic deformation is carried out in that higher temperatures is subcutaneous in the blank front portion, and metal can carry out fully crystallization again in the deformed area He after going out nib, so crystal grain is bigger; The blank rear end is owing to temperature low (because cooling effect of recipient), and crystallization is incomplete again in the deformed area He after going out nib for metal, so crystal grain is thinner, even fibrous cold working tissue occurs.
Lamellar tissue
In the extruding forging stock, usually can observe lamellar tissue.So-called lamellar tissue also claims lamellar structure,
It is characterized in that forging stock after fractureing, present and wooden similar fracture that the fracture surface of layering is uneven.The direction of layering and extruding forging stock axially parallel continue plastic working or heat treatment and all can't eliminate this lamellar tissue.
(5) extrusion process flow process
According to the forging stock requirement, consider the technological requirement of extrusion process and machining, make extrusion figure.
Extruding force, extrusion die face size and extruded product cross dimensions big or small closely related.
Use N
2Or Ar gas gets rid of the air in the extrusion die die cavity, prevents that copper alloy liquid from producing oxidation and be mingled with in the extrusion molding flow process.Adopting squeeze pack speed is 2.0～2.5m/s, and the extrusion ratio of copper can reach 100～400, and extruding force is 500kN～100MN, can produce the copper alloy squeeze casting of dense structure.
The extrusion piston of extrusion die and demand chamber sprue bush have designed independently heater.Heating-up temperature is 400 ~ 460 ℃, and the monolateral between the two fit clearance of extrusion piston and demand chamber sprue bush is got 0.02 ~ 0.05mm.
Extrusion process parameters as shown in Table 1.
Table one:
Adopt the cold-extruded platen press can improve extrusion speed; Suppress the crystallization again or the carrying out of crystal growth again, prevent that product surface from producing coarse grain ring (for section bar, it is more suitable to be called surperficial coarse-grain layer); Improve surface quality, improve brightness.
(6) squeeze base preliminary treatment-phosphatization saponification
The phosphating coat outward appearance is from ash or lead, and its film has the loose structure of fine cracks again, and corrosion resistance, hygroscopicity, the antifriction performance of material surface are improved; Handle through filling, immersion oil or japanning on the phosphating coat surface, has resistance to corrosion preferably under atmospheric conditions, interior in the high adsorption capacity of rete, the bottom of Chang Zuowei coating.Phosphating coat has higher electrical insulation capability, generally is applied in the electric insulation layer of the steel disc of motor, transformer, and film and piece surface have good bonding force.Through phosphorus after treatment, the virgin metal mechanical performance of part, intensity, magnetic etc. are constant substantially.Phosphating coat has good lubricating property, as part cold pressing, lubricating layer when cold drawn, can reduce friction, avoid and reduce mechanical damage mould, prolong the service life of mould.
The coefficient of friction of phosphating coat itself is also not really low, in order to improve the cold extrusion lubricant effect, implements saponification usually again and handle after phosphatization.Saponification is to utilize Sodium stearate or soap to make lubricant, makes the trbasic zinc phosphate (Zn in itself and the phosphate coating
3(PO
4)
2) reaction generation zinc stearate ((C
17H
35COO)
2Zn is commonly called as zinc fertilizer soap or metallic soaps) a kind of lubricated method.Its chemical equation is as follows:
Zn
3(PO
4)
2+6C
17H
35COONa→3(C
17H
35COO)
2Zn+2Na
3PO
4
Forge 3: want light and fast when just forging, will weigh during middle the forging and slow, and in the brittle zone, rap shaping.
Want light and fast when (1) just forging.Owing to can produce forging deformation heat when forging, the forging temperature is raise.And the adhesion of bronze is big, and is mobile poor, easier generation distortion heat during forging.If just reforge when just forging in the violent place of distortion, might accumulate too much distortion heat, make forging on the basis of initial temperature, local temperature rise is too high and cause burning again.This moment is distortion significantly, will ftracture.
To weigh when forging (2) and slow.Forging is in when distortion, though can produce forging deformation heat. and these heats do not support it in air and the thermal loss on the anvil face.So, after just forging, just can carry out reforge, so that it can reach needed part shape rapidly.But reforge is unsuitable overweight too fast, if overweight, then deflection of material is too big, and some local deflection might surpass the plastic limit of material, causes cracking; If too fast, then might be too much because of the local deformation heat accumulation of material, make its local temperature be elevated to the burning temperature, this moment, distortion also can be ftractureed.
(3) in the brittle zone, rap shaping.
Smithing technological parameter as shown in Table 2.
Table two:
Owing to can produce forging deformation heat when forging, the forging temperature is raise.And the adhesion of bronze is big, and is mobile poor, easier generation distortion heat during forging.Reforge and fast in the violent place of distortion, might accumulate too much distortion heat, makes forging on the basis of initial temperature, and local temperature rise is too high and cause burning again.This moment is distortion significantly, will ftracture.
Forge copper alloy and have higher intensity, better ductility and more diversified mechanical property.The forging and molding method can obtain to satisfy the high-performance copper forging of more needs, be the cast copper alloy product can't replace.
The present invention is mainly used in the tin bronze valve body of 3/8 " 4 " (being of a size of 3/8 inch-4 inches), the serial part that pipe joint forges.
Claims (6)
1. the processing technology of tin bronze valve body, pipe joint is characterized in that: in turn include the following steps:
(1) is handled in the tin bronze modification: earlier reinforced melting, and refining treatment again adds the RE-Li-Bi alterant and is warmed up to 1150-1250 ℃ and carries out modification and handle, cast then, and start oscillator and carry out continuous casting and draw ingot to obtain strand, Sn:2wt%-6wt% in the strand that obtains; Zn:3wt%-6wt%; Pb:1wt%-5wt%; Re:0.03wt%-0.25wt%; Cu:80wt%-96wt%;
Extruding forging stock (2): use N
2Or Ar gas is got rid of the air in the extrusion die die cavity, prevent that copper alloy liquid from producing oxidation and be mingled with in the extrusion molding flow process, adopting squeeze pack speed is 2.0～2.5m/s, extrusion ratio is 100～400, extruding force is 500kN～100MN, and extruding obtains the copper alloy squeeze casting of dense structure; The extrusion piston of extrusion die and demand chamber sprue bush are provided with independently heater, and heating-up temperature is 400-460 ℃, and the monolateral between the two fit clearance of extrusion piston and demand chamber sprue bush is 0.02-0.05mm;
Forge (3): want light and fast when just forging, will weigh during middle the forging and slow, and in the brittle zone, rap shaping.
2. the processing technology of tin bronze valve body as claimed in claim 1, pipe joint, it is characterized in that: described tin bronze modification is handled in (1) and is fed to melting in the intermediate frequency furnace, fusing fast, it is overheated to prevent, after the furnace charge fusing, carry out refining treatment, be warmed up to 1050 ℃ again, carry out the P-Cu deoxidation, again after the skimming, add lead and tin, be warmed up to 1150 ℃ again, carry out composite refining, add the RE-Li-Bi alterant, be warmed up to the 1150-1250 ℃ of processing of going bad after leaving standstill, adjust temperature then and pour into a mould, and start oscillator and carry out continuous casting and draw ingot to obtain strand.
3. the processing technology of tin bronze valve body as claimed in claim 2, pipe joint is characterized in that: extruding is adopted and is added warm extrusion in the described extruding forging stock (2), during 2wt%＜Sn≤3wt%, adopts 780 ℃-880 ℃ extrusion temperature; During 3wt%＜Sn≤5wt%, adopt 650 ℃-780 ℃ extrusion temperature; During 5wt%＜Sn≤6wt%, adopt 600 ℃-740 ℃ extrusion temperature.
4. the processing technology of tin bronze valve body as claimed in claim 2, pipe joint is characterized in that: the normal temperature cold-extruded is adopted in extruding in the described extruding forging stock (2).
5. the processing technology of tin bronze valve body as claimed in claim 2, pipe joint is characterized in that: described forging (3) is adopted and to be added warm forging, during 2wt%＜Sn≤3wt%, adopts 780 ℃-880 ℃ forging temperature; During 3wt%＜Sn≤5wt%, adopt 650 ℃-780 ℃ forging temperature; During 5wt%＜Sn≤6wt%, adopt 460 ℃-650 ℃ forging temperature.
6. the processing technology of tin bronze valve body as claimed in claim 2, pipe joint is characterized in that: the normal temperature cold forging is adopted in described forging (3).
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| CN114273862B (en) * | 2021-12-28 | 2023-03-28 | 东北大学 | Integrally-formed aluminum alloy battery tray and manufacturing method thereof |
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