CN101934302A - Method for preparing seamless titanium alloy tube for aircraft engine - Google Patents
Method for preparing seamless titanium alloy tube for aircraft engine Download PDFInfo
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- CN101934302A CN101934302A CN 201010250929 CN201010250929A CN101934302A CN 101934302 A CN101934302 A CN 101934302A CN 201010250929 CN201010250929 CN 201010250929 CN 201010250929 A CN201010250929 A CN 201010250929A CN 101934302 A CN101934302 A CN 101934302A
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Abstract
The invention discloses a method for preparing a seamless titanium alloy tube for an aircraft engine. The seamless titanium alloy tube for the aircraft engine which meets corresponding requirements is manufactured by improving the technological plasticity of the titanium alloy tube material. The method comprises the following steps of: firstly, smelting a spongy cast ingot to introduce interstitial elements as little as possible; secondly, cogging and forging heated cast ingot at large deformation and repeatedly upsetting and stretching the cast ingot to ensure that as-cast coarse grains are completely crushed and thinned, thermally processing formed tube billet under vacuum to eliminate residual stress produced during tube billet extrusion so as to improve the plasticity of the tube billet; thirdly, cogging and rolling the tube billet at large deformation and further thinning the grains; and finally, annealing at a low temperature after cold rolling of intermediate rolling and finished product rolling to effectively control the coarsening of the grains. Therefore, full recrystallization can be ensured by prolonging the heating time, and mechanical property and processing property required by material consumption of the aircraft engine can be met under the condition that the tube structure is fully recrystallized.
Description
Technical field
The invention belongs to the nonferrous materials processing technique field, be specifically related to the preparation method of a kind of aircraft engine with seamless titanium alloy tubing.
Background technology
Along with the flourish and national startup of aircraft project greatly of China's Aviation Industry, aircraft engine pipe-line system titanium or titanium alloy small dimension tubing, such as the titanium alloy pipe of small dimensions such as TA1, TA2, TA18, its demand can significantly rise.That such titanium alloy pipe has is in light weight, specific strength is high, corrosion resistance good, nonmagnetic, advantage such as moulding process good, linear expansion coefficient is little, and pipe-line systems such as Chang Zuowei hydraulic pressure, fuel oil are used on Aero-Space and civil aircraft.Utilize such titanium alloy pipe to substitute stainless steel aviation conduit, can make aircraft pipeline loss of weight about 40.0%, help alleviating the construction weight of aircraft; This promotes the technological progress of aircraft industry to play an important role to improving the flying quality of aircraft.
The main production unit of China's titanium material processing also can't be produced the titanium alloy pipe that satisfies the aircraft engine requirement but so far.The main problem that exists is that mechanical properties of tubular goods instability and processing performance (flattening and enlarging) can not reach corresponding requirement, and lumber recovery is too low.The mechanical properties of tubular goods instability shows that mainly the material composition deviation is bigger, and various impurity components do not have clear and definite scope; Material processing technique does not solidify, and deflection does not reach requirement, and the microscopic structure of material is not by abundant refinement; Heat treatment temperature is higher, microscopic structure alligatoring after Overheating Treatment of fragmentation after the cold working.More than three kinds of reasons cause titanium alloy pipe mechanical property (tensile strength) not reach requirement, coarse microstructure makes that tubing plasticity is low, enlarging and flatten cracking easily.
Summary of the invention
The purpose of this invention is to provide the preparation method of a kind of aircraft engine with seamless titanium alloy tubing, by improving the process plastic of titanium alloy pipe material, thereby produce the aircraft engine that satisfies corresponding requirements seamless titanium alloy tubing, and significantly improved the lumber recovery of tubing.
The present invention is achieved through the following technical solutions:
A kind of aircraft engine preparation method of seamless titanium alloy tubing may further comprise the steps:
1) bar in the middle of ingot casting forges
Titaniferous mass fraction after the melting is not less than 99.6% titanium sponge ingot casting, be heated to 1000～1100 ℃, it is that 60～80% cogging is forged that deflection is carried out in insulation behind 4～6h, carrying out two fire after cogging is forged and finished forges, be no less than the upsetting pull of five passages during every fire forges, round as a ball after upsetting pull is finished is bar;
2) bar is squeezed into pipe in the middle of
Get out the through hole that the endoporus with extrusion tube blank adapts at middle bar center, and middle bar outer surface, through-hole inner surface and end face are coated thickness is the copper sheet of 1.0～2.0mm, be heated to 700～750 ℃ of insulation 1～3h then, again it is sent into extruder and be squeezed into pipe, extrusion speed is controlled at 50～55mm/s; Will extruding good pipe is at 650～700 ℃ of heat treatment 30～45min, after heat treatment is finished, is 30～60% HNO in volumetric concentration
3Soak to remove the copper sheet that remains in the pipe surface in the pickle, and remove lip-deep folding, crackle of pipe and pit;
3) split rolling method of pipe
The flawless pipe of outer surface is at room temperature sent into the split rolling method that two roller big mills carry out 2～3 passages, every time deflection is 45～65%, behind preceding twice split rolling method, the tubing endoporus is handled by boring cutter, after removing greasy dirt that tube surfaces adheres to after rolling the finishing and cleaning, 1.0 * 10 with pickle
-2～1.0 * 10
0600～700 ℃ of heat treatment 0.5～2.0h under the vacuum condition of Pa, voltage rise rate≤2.0Pa/h cool to the air cooling of coming out of the stove below 200 ℃ then with the furnace, check and remove external defects;
4) tube rolling in the middle of
Pipe behind the split rolling method is carried out the cold rolling of continuous 2～3 passages on the multiple roll cold pilger mill, every time cold rolling deflection is controlled at 10.0～30.0%, the total deformation of every continuous 2～3 passages is controlled at 40.0～60.0%, cold rolling back is removed the greasy dirt of tube surfaces adhesion and is cleaned with pickle, then 1.0 * 10
-2～1.0 * 10
0650～700 ℃ of heat treatment 0.5～2.0h under the vacuum condition of Pa, voltage rise rate≤2.0Pa/h cool to the air cooling of coming out of the stove below 200 ℃ with the furnace after heat treatment is finished, tubing in the middle of obtaining after inspection and the removal external defects;
5) finished product tube rolling
Middle tubing is carried out the cold rolling of continuous 2～3 passages, and every time cold rolling deflection is controlled at 10.0～30.0%, total deformation 35.0～60.0%, and cold rolling back is removed the greasy dirt of tube surfaces adhesion and is cleaned with pickle, then 1.0 * 10
-2～1.0 * 10
0500～550 ℃ of heat treatment 1.0～1.5h under the vacuum condition of Pa, voltage rise rate≤2.0Pa/h cool to the air cooling of coming out of the stove below 200 ℃ with the furnace after heat treatment is finished, obtain finished product tubing.
Described ingot casting melting is:
With titanium sponge ingot casting raw material at 100～120 ℃ of drying 6～10h, carry out electrode block compacting and welding titanium sponge ingot casting raw material then, vacuum consumable electrode arc furnace is selected in the melting of titanium sponge for use, the melting electric current is at 20.0～30.0kA between 0.1～10.0Pa, smelting temperature is about 2300 ℃, smelting time 2.0～5.0h, adopt recirculated water cooling copper crucible in the ingot casting fusion process, select for use steel brush and portable abrasive machine to remove surface contaminant, choosing uses the same method and carries out secondary smelting, obtains ingot casting after secondary smelting is finished.
Ingot casting after the described melting, by mass fraction, the chemical composition Fe:0 of ingot casting～0.06%, C:0～0.05%, N:0～0.05%, O:0～0.10%, H:0～0.01%, Si:0～0.04%, single impurity mass fraction is not more than 0.1%, its surplus impurity summation mass fraction that comprises is not more than 0.4%, and all the other are Ti.
The intensity of described pipe is 400.0～700.0Mpa, and recrystallization temperature is 500～600 ℃.
Described bore hole is being guaranteed wall thickness deviation less than 0.40mm, effectively removes the crackle and the pit of pipe inner wall surface.
When described bore hole was the middle tubing of Φ 30～Φ 40mm in the processing specification, the bore hole amount was controlled at 0.30～0.50mm.
The pickle of the described pickling that is used for comprises the hydrofluoric acid of 15.0～30.0% nitric acid and 5.0～10.0%, and all the other are water.
The microscopic structure of described finished product tubing is an equiaxed structure, and the mean grain size of equiaxed structure is 6～8 grades.
Compared with prior art, the present invention has following beneficial technical effects:
1, the present invention satisfies the small dimension seamless titanium alloy tubing that aircraft engine is used by refinement tubing crystal grain and cold rolling method to improve the process plastic of titanium alloy pipe, to prepare, and has significantly improved the lumber recovery of tubing;
Its microscopic structure of finished product tubing of the present invention's preparation is an equiaxed structure, and the mean grain size of equiaxed structure is 6～8 grades; The tensile property of finished product tubing is: tensile strength R
m=450.0MPa, yield strength R
P0.2=305.0MPa, contraction percentage of area A
50=30.0%; It is 74 ° conical plunger tip that angle is adopted in enlarging, the enlarging ratio reach 35% o'clock qualified, qualified when crimping onto the distance of flattening between the surface and being 4mm; (long * wide * dark: 3.0 * 0.1 * 0.05mm) carry out ultrasonic examination, and qualification rate is 42.6% according to labor standard flaw detection requirement.
2, the improvement of the grain refinement of tubing of the present invention and process plastic realizes one by one in the process of preparation: at first the ingot casting melting is with the least possible introducing interstitial element; Next forges and upsetting pull repeatedly carrying out the aximal deformation value cogging after the ingot casting heating, guarantees the complete broken refinement of coarse grain of as cast condition, to the residual stress of pipe vacuum heat to produce in the elimination pipe extrusion process that forms, improves the plasticity of pipe; Once more, to the further crystal grain thinning of pipe aximal deformation value split rolling method; Then after rolling cold rolling of intermediate rolling and finished product, grain coarsening can be effectively controlled in annealing under lower temperature, prolong heat time heating time and can guarantee perfect recrystallization, the residual stress of not only eliminating tubing inside is recovered the plasticity of material, and guarantees that tubing is organized in and can satisfy desired mechanics of aircraft engine materials and processing performance under the perfect recrystallization state.
3, aircraft engine is had relatively high expectations to crackle with the tube wall of tubing, and the wall thickness deviation of finished product tubing will be controlled in the 0.05mm.The present invention is by being rolled down to big specification pipe in the deformation process of small dimension finished product tubing, inner surface to tubing carries out the bore hole processing, effectively remove surface cracks and pit, guarantee defectives such as internal surface of pipe flawless and pit, guarantee that simultaneously the tube wall thickness deviation is less than 0.40mm.
The specific embodiment
Below in conjunction with specific embodiment the present invention is done detailed description, the explanation of the invention is not limited.
Embodiment 1 specification is the preparation of the aircraft engine of Φ 12.0 * 1.25mm (diameter 12.0mm, wall thickness 1.25mm) with seamless titanium alloy tubing
1) ingot casting melting, forges into bar
Selecting zero level or one-level titanium sponge for use according to GB/T 2524-2002 is raw material, and raw material is reviewed, and the screening impurity content is lower than the raw material of 0.4% (mass fraction), and artificial screening is rejected the titanium sponge of variable color (color is turned to be yellow or turned blue).
Before the electrode block compacting titanium sponge is dried: at 100 ℃ of dry 10h, after the oven dry titanium sponge is pressed into electrode block, with electrode block welding, melting, guarantees that electrode block does not absorb the water in air branch before melting after compacting is finished;
The smelting equipment of ingot casting is selected vacuum consumable electrode arc furnace for use, the diameter of selecting copper crucible during pill heat for use is 560mm, furnace pressure is controlled between 0.1～10.0Pa, the melting Current Control is at 20.0～25.0kA, smelting temperature is 2500 ℃, smelting time 2.0h adopts recirculated water cooling copper crucible in the ingot casting fusion process; Cool off 3.0h after melting is finished in a vacuum and come out of the stove, clean out the pollutant of ingot casting surface adhesion, the lathe processing that strips off the skin is adopted at the oxidation position at ingot casting rising head place, and in time carried out secondary smelting with steel brush or portable abrasive machine; It is 640mm that secondary smelting is selected the diameter of copper crucible for use, and the melting program is removed the oxide skin and the shrinkage cavity on ingot casting surface with lathe after secondary smelting is finished, to obtain the ingot casting of high-quality with last time identical.
The chemical composition of ingot casting after the melting, count by mass fraction: Fe:0～0.06%, C:0～0.05%, N:0～0.05%, O:0～0.10%, H:0～0.01%, Si:0～0.04%, the impurity summation mass fraction that it comprises is not more than 0.4%, and single impurity mass fraction is not more than 0.1%, and all the other are Ti.
Place electric furnace to be heated to 1000 ℃ on the titanium ingot after the melting, insulation 6h, carrying out cogging then on hydraulic press or pneumatic hammer forges, deflection is controlled at 60%, carrying out two fire after cogging is forged and finished forges, be no less than the upsetting pull of five passages during every fire forges, reconditioning was removed the surface because of forging the crackle that produces after upsetting pull was finished, and the acquisition cross section is 300mm
2Left and right sides square billet.
With the square billet cutting length is about 500mm, is warming up to 900 ℃ in the electric furnace of packing into and with stove, transfers to the upsetting pull of carrying out five passages on the fast forging machine behind the insulation 3h and forges, and final forging temperature must not be lower than 700 ℃, reconditioning face crack before the heating.
After the upsetting pull through two fire time five passages square billet is forged into the initial bar that diameter is 150～153mm, obtain the middle bar that diameter is 145～146mm after with lathe surface scale being taken off light and reconditioning face crack again.
2) bar is squeezed into pipe in the middle of
The bar center is got out the through hole that diameter is 33.0～33.3mm, it is the copper sheet of 1.0mm that middle bar outer surface, through-hole inner surface and end face coat thickness, the electric furnace of packing into is heated to 700 ℃, and insulation 1h, send into then in 1600 tons of horizontal extruders, selecting the recipient diameter for use is 150mm, extruding gauge 29mm, extrusion speed is 50～60mm/s, is squeezed into the pipe that specification is Φ 45 * 8.0mm;
With the pipe that is squeezed in electric furnace in 650 ℃ of heat treatment 30min, thereby eliminate the residual stress that produces in the pipe extrusion process, make pipe possess good plasticity; After heat treatment was finished, selecting volumetric concentration for use was 30% HNO
3Pickle soaks the copper sheet of removing the pipe remained on surface; The even part of excision pipe two wall unevenness, and adopt and manually scrape the defectives such as method removal surface laps, crackle and pit of repairing, make outer surface of tube blank present trouble-free state by these processing.
The pipe tensile property is tensile strength R
m=455.0MPa, yield strength R
P0.2=280.0MPa, elongation after fracture A
50=25.0%, contraction percentage of area Z=70.0%; Microscopic structure is an equiaxed structure, and grain size is 4 grades.
3) split rolling method of pipe
The flawless pipe of outer surface is at room temperature sent into two roller big mills carry out split rolling method, used milling train is for can carry out the rolling homemade LG60 type two-roller mill of large deformation.When the first passage split rolling method, milling train rotating speed 50～60 times/minute, feed is 4.0～5.0mm/ time, deflection is controlled at 50.8%, promptly is rolled down to Φ 32.0 * 5.5mm from Φ 45.0 * 8.0mm; Tubing after cold rolling is removed the greasy dirt of tube surfaces with the immersion of metal cleaner preparation cleaning fluid in ultrasonic cleaner, and (pickle is proportioning by volume, comprises 15.0% HNO with pickle
3With 5.0% HF, all the other are H
2O) clean after the tubing, in vacuum heat treatment furnace, vacuum is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 680 ℃ of heat treatment 1.0h, the air cooling of coming out of the stove when cooling to 200 ℃ then with the furnace.According to the suitable boring cutter of endoporus size Selection endoporus is carried out bore hole and handle, the monolateral depth of cut is controlled at 0.3～0.5mm, and guarantees that wall thickness deviation is in 0.4mm.
Select for use LG30 type two-roller mill to carry out the second road split rolling method, milling train rotating speed 70～80 times/minute, feed 4～5mm/ time, deflection is 63.0%, promptly is rolled down to Φ 22.0 * 3.0mm from Φ 32.0 * 5.5mm; Tubing after cold rolling is removed the greasy dirt (rolled lubricating oil) of tube surfaces with metal cleaner in ultrasonic cleaner, and with after the pickle cleaning tubing, in vacuum heat treatment furnace, vacuum is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 650 ℃ of heat treatment 1.0h, the air cooling of coming out of the stove when cooling to 200 ℃ with the furnace.
4) tube rolling in the middle of
Pipe behind the split rolling method is sent into homemade LD30 type three roller finishing mills carry out the cold rolling of middle tubing, the milling train rotating speed is 90 times/minute when rolling, feed 3mm/ time, the rolling total deformation of continuous two passages is 59.3%: the first passage: be rolled down to Φ 18.0 * 2.25mm by Φ 22.0 * 3.0mm; Second passage: be rolled down to Φ 15.0 * 1.75mm by Φ 18.0 * 2.25mm; The middle tubing that obtains after cold rolling is removed the greasy dirt of tube surfaces with metal cleaner in ultrasonic cleaner after, pickle cleans tubing (cleaning the back tube surfaces is silvery white in color); Then, heat-treat at vacuum heat treatment furnace: vacuum degree control is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 600 ℃ of heat treatment 0.5h cool to the air cooling of coming out of the stove below 200 ℃ with the furnace after heat treatment is finished, and inspection obtains middle tubing after also manually scraping and repairing the removal external defects.
5) the finished product cold reduction of tubes
Middle tubing is carried out to the cold rolling of product tubing with homemade LD15 type three roller finishing mills, milling train rotating speed 50～60 times/minute, feed 1.5～2.0mm/ time, adopt the rolling of continuous two passages, total deformation is that 39.4%: the first passage is rolled down to Φ 13.5 * 1.45mm by Φ 15.0 * 1.75mm, and second passage is rolled down to Φ 12.0 * 1.25mm by Φ 13.5 * 1.45mm; Finished product tubing is removed the greasy dirt of tube surfaces with metal cleaner in ultrasonic cleaner after, select pickle rinsing tubing for use, clean the back tube surfaces and be silvery white in color; Then, heat-treat at vacuum heat treatment furnace: vacuum degree control is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/min, 500～550 ℃ of heat treatment 1.0h cool to the air cooling of coming out of the stove below 200 ℃ with the furnace after heat treatment is finished, obtain finished product tubing.
Its microscopic structure of finished product tubing after the heat treatment is thin brilliant equiaxed structure, and grain size is 7～8 grades, and the tensile property of finished product tubing is: tensile strength R
m=450.0MPa, yield strength R
P0.2=305.0MPa, contraction percentage of area A
50=30.0%; It is 74 ° conical plunger tip that angle is adopted in enlarging, the enlarging ratio reach 35% o'clock qualified, qualified when crimping onto the distance of flattening between the surface and being 4mm; (long * wide * dark: 3.0 * 0.1 * 0.05mm) carry out ultrasonic examination, and qualification rate is 42.6% according to labor standard flaw detection requirement.
Embodiment 2 specifications are the preparation of the aircraft engine of Φ 10 * 1mm with seamless titanium alloy tubing
1) ingot casting melting, forges into bar
Selecting zero level or one-level titanium sponge for use according to GB/T 2524-2002 is raw material, and raw material is reviewed, and the screening impurity content is lower than the raw material of 0.4% (mass fraction), and artificial screening is rejected the titanium sponge of variable color (color is turned to be yellow or turned blue).
Before the electrode block compacting titanium sponge ingot casting raw material is dried: at 120 ℃ of dry 6h, after the oven dry ingot casting is carried out the electrode block compacting, suppress finish after with electrode block in time weld, melting, guarantee that electrode block does not absorb the water in air branch before melting;
The smelting equipment of ingot casting is selected vacuum consumable electrode arc furnace for use, the diameter of selecting copper crucible during pill heat for use is 560mm, furnace pressure is controlled between 0.1～10.0Pa, the melting Current Control is at 25.0～28.0kA, smelting temperature is 2800 ℃, smelting time 2.5h adopts recirculated water cooling copper crucible in the ingot casting fusion process; After melting is heated and finished, after ingot casting cools off 5.0h in a vacuum, the pollutant of ingot casting surface adhesion is cleaned out with steel brush or portable abrasive machine, the lathe processing that strips off the skin is adopted at the oxidation position at ingot casting rising head place, and in time carried out secondary smelting; It is 640mm that secondary smelting is selected the diameter of copper crucible for use, and the melting program is removed the oxide skin and the shrinkage cavity on ingot casting surface with lathe after secondary smelting is finished, to obtain the ingot casting of high-quality with last time identical.
The chemical composition of titanium ingot after the melting, count by mass fraction: Fe:0～0.06%, C:0～0.05%, N:0～0.05%, O:0～0.10%, H:0～0.01%, Si:0～0.04%, the impurity summation mass fraction that it comprises is not more than 0.4%, and single impurity mass fraction is not more than 0.1%, and all the other are Ti.
Place electric furnace to be heated to 1100 ℃ on the titanium ingot after the melting, insulation 4h, carrying out cogging then on hydraulic press or pneumatic hammer forges, deflection is controlled at 80%, carrying out two fire after cogging is forged and finished forges, be no less than the upsetting pull of five passages during every fire forges, reconditioning was removed the surface because of forging the crackle that produces after upsetting pull was finished;
With the square billet cutting length is about 500mm, is warming up to 900 ℃ in the electric furnace of packing into and with stove, transfers to the upsetting pull of carrying out five passages on the fast forging machine behind the insulation 3h and forges, and final forging temperature must not be lower than 700 ℃, reconditioning face crack before the heating.
After the upsetting pull through two fire time five passages square billet is forged into the initial bar that diameter is 150～153mm, obtain the middle bar that diameter is 145～146mm after with lathe surface scale being taken off light and reconditioning face crack again.
2) bar is squeezed into pipe in the middle of
The bar center is got out the through hole that diameter is 35.0～36.3mm, it is the copper sheet of 2.0mm that middle bar outer surface, through-hole inner surface and end face coat thickness, the electric furnace of packing into is heated to 750 ℃, and insulation 3h, send into then in 1600 tons of horizontal extruders, selecting the recipient diameter for use is 150mm, extruding gauge 29mm, extrusion speed is 50～60mm/s, is squeezed into the pipe that specification is Φ 45 * 8.0mm;
With the pipe that is squeezed in electric furnace in 700 ℃ of heat treatment 30min, thereby eliminate the residual stress that produces in the pipe extrusion process, make pipe possess good plasticity; After heat treatment was finished, selecting volumetric concentration for use was 60% HNO
3Pickle soaks the copper sheet of removing the pipe remained on surface; The even part of excision pipe two wall unevenness, and adopt and manually cut the defectives such as method removal surface laps, crackle and pit of repairing to pieces, make outer surface of tube blank present trouble-free state by these processing.
The pipe tensile property is tensile strength R
m=455.0MPa, yield strength R
P0.2=280.0MPa, elongation after fracture A
50=25.0%, contraction percentage of area Z=70.0%; Microscopic structure is an equiaxed structure, and grain size is 4 grades.
3) split rolling method of pipe:
The flawless pipe of outer surface is at room temperature sent into two roller big mills carry out split rolling method, used milling train is for can carry out the rolling homemade LG60 type two-roller mill of large deformation.When the first road cogging is time rolling, milling train rotating speed 50～55 times/minute, feed is 4.0～5.0mm/ time, deflection is controlled at 45.8%, promptly is rolled down to Φ 35.0 * 5.5mm from Φ 45.0 * 8.0mm; Tubing after cold rolling is removed the greasy dirt of tube surfaces with the immersion of metal cleaner preparation cleaning fluid in ultrasonic cleaner, and (pickle is proportioning by volume, comprises 25.0% HNO with pickle
3With 8.0% HF, all the other are H
2O) clean after the tubing, in vacuum heat treatment furnace, vacuum is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 700 ℃ of heat treatment 1.0h, the air cooling of coming out of the stove when cooling to 200 ℃ then with the furnace.According to the suitable boring cutter of endoporus size Selection endoporus is carried out bore hole and handle, the monolateral depth of cut is controlled at 0.3～0.5mm, and guarantees that wall thickness deviation is in 0.3mm.
Select for use LG30 type two-roller mill to carry out the second road split rolling method, milling train rotating speed 75～78 times/minute, feed 4～5mm/ time, deflection is 63.0%, promptly is rolled down to Φ 22.0 * 3.0mm from Φ 32.0 * 5.5mm; Tubing after cold rolling is removed the greasy dirt (rolled lubricating oil) of tube surfaces with metal cleaner in ultrasonic cleaner, and with after the pickle cleaning tubing, in vacuum heat treatment furnace, vacuum is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 650 ℃ of heat treatment 1.0h, the air cooling of coming out of the stove when cooling to 200 ℃ with the furnace.
4) tube rolling in the middle of
Pipe behind the split rolling method is sent into homemade LD30 type three roller finishing mills carry out the cold rolling of middle tubing, milling train rotating speed 80～90 times/minute, feed 3～4mm/ time, total deformation are 50.9%, select continuous rolling for use: first passage is rolled down to Φ 19.0 * 2.5mm by Φ 22.0 * 3.0mm; Second passage is rolled down to Φ 16.0 * 2.0mm by Φ 19.0 * 2.5mm; In ultrasonic cleaner, remove the greasy dirt of tube surfaces with metal cleaner after, and with the pickle rinsing (pickle proportioning by volume comprises 30.0% HNO
3With 10.0% HF, all the other are H
2O) tubing cleans the back tube surfaces and is silvery white in color, and in vacuum heat treatment furnace, vacuum is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, heat treating regime is 700 ℃/1.0h, the air cooling of coming out of the stove when cooling to 180 ℃ with the furnace.
Tubing after the heat treatment is adopted LD15 type three roller finishing mills, adopt the milling train rotating speed 50～60 times/minute when rolling, feed 2.0～2.5mm/ time, continuous two passages rolling, total deformation is that 38.4%: the first passage is rolled down to Φ 14.5 * 1.7mm by Φ 16.0 * 2.0mm; Second passage is rolled down to Φ 13.0 * 1.5mm by Φ 14.5 * 1.7mm; Middle tubing after cold rolling is removed the greasy dirt of tube surfaces with metal cleaner in ultrasonic cleaner after, and with the pickle rinsing (pickle proportioning by volume comprises 25.0% HNO
3With 80% HF, all the other are H
2O) tubing cleans the back tube surfaces and is silvery white in color, and heat-treats at vacuum heat treatment furnace, and vacuum degree control is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 630 ℃/1.0h of heat treating regime, tubing in the middle of obtaining; After finishing, heat treatment repaiies the defective of removing tube surfaces by cutting to pieces.
5) the finished product cold reduction of tubes
Middle tubing is carried out to the cold rolling of product tubing with homemade LD15 type three roller finishing mills, milling train rotating speed 50～60 times/minute, feed 1.5～2.0mm/ time, total deformation is 47.8%, adopt the rolling of continuous two passages: first passage is rolled down to Φ 11.5 * 1.3mm by Φ 13.0 * 1.5mm, second passage by Φ 11.5 * 1.3mm after continuous rolling Φ 10.0 * 1.0mm; The cold rolling finished product tubing that obtains is removed the greasy dirt of tube surfaces with metal cleaner liquid in ultrasonic cleaner after, (pickle proportioning by volume comprises 20.0% HNO to select pickle for use
3With 6.0% HF, all the other are H
2O) rinsing tubing, tube surfaces is silvery white in color after the rinsing; And heat-treat at vacuum heat treatment furnace: vacuum degree control is 1.0 * 10
0～1.0 * 10
1Pa, voltage rise rate≤2.0Pa/min, 510 ℃/1.2h of heat treating regime obtains finished product tubing.
Its microscopic structure of finished product tubing after the annealing is thin brilliant equiaxed structure, and grain size is 7～8 grades, and the tensile property of finished product tubing is: tensile strength R
m=430.0MPa, yield strength R
P0.2=285.0MPa, contraction percentage of area A
50=33.0%; It is 74 ° conical plunger tip that angle is adopted in enlarging, the enlarging ratio reach 40% o'clock qualified, qualified when crimping onto the distance of flattening between the surface and being 3.34mm; (long * wide * dark: 3.0 * 0.1 * 0.05mm) carry out ultrasonic examination, and qualification rate is 47.5% to hinder requirement according to labor standard.
Embodiment 3 specifications are the preparation of the aircraft engine of Φ 8 * 1.25mm with seamless titanium alloy tubing
1) ingot casting melting, forges into bar
Selecting zero level or one-level titanium sponge for use according to GB/T 2524-2002 is raw material, and raw material is reviewed, and the screening impurity content is lower than the raw material of 0.4% (mass fraction), and artificial screening is rejected the titanium sponge of variable color (color is turned to be yellow or turned blue).
Before the electrode block compacting titanium sponge ingot casting raw material is dried: at 105 ℃ of dry 8h, after the oven dry ingot casting is carried out the electrode block compacting, suppress finish after with electrode block in time weld, melting, guarantee that electrode block does not absorb the water in air branch before melting;
The smelting equipment of ingot casting is selected vacuum consumable electrode arc furnace for use, the diameter of selecting copper crucible during pill heat for use is 560mm, furnace pressure is controlled between 0.1～10.0Pa, the melting Current Control is at 26.0～29.0kA, smelting temperature is 2650 ℃, smelting time 2.0h adopts recirculated water cooling copper crucible in the ingot casting fusion process; After melting is heated and finished, after ingot casting cools off 4.0h in a vacuum, the pollutant of ingot casting surface adhesion is cleaned out with steel brush or portable abrasive machine, the lathe processing that strips off the skin is adopted at the oxidation position at ingot casting rising head place, and in time carried out secondary smelting; It is 640mm that secondary smelting is selected the diameter of copper crucible for use, and the melting program is removed the oxide skin and the shrinkage cavity on ingot casting surface with lathe after secondary smelting is finished, to obtain the ingot casting of high-quality with last time identical.
The chemical composition of titanium ingot after the melting, count by mass fraction: Fe:0～0.06%, C:0～0.05%, N:0～0.05%, O:0～0.10%, H:0～0.01%, Si:0～0.04%, the impurity summation mass fraction that it comprises is not more than 0.4%, and single impurity mass fraction is not more than 0.1%, and all the other are Ti.
Place electric furnace to be heated to 1080 ℃ on the titanium ingot after the melting, insulation 4.5h carries out cogging then and forges on hydraulic press or pneumatic hammer, and deflection is controlled at 65%, and reconditioning was removed the surface because of forging the crackle that produces after upsetting pull was finished, and the acquisition cross section is 300mm
2Left and right sides square billet.
With the square billet cutting length is about 500mm, is warming up to 900 ℃ in the electric furnace of packing into and with stove, transfers to the upsetting pull of carrying out five passages on the fast forging machine behind the insulation 3h and forges, and final forging temperature must not be lower than 700 ℃, reconditioning face crack before the heating.
After the upsetting pull through two fire time five passages square billet is forged into the initial bar that diameter is 150～153mm, obtain the middle bar that diameter is 145～146mm after with lathe surface scale being taken off light and reconditioning face crack again.
2) bar is squeezed into pipe in the middle of
The bar center is got out the through hole that diameter is 35.0～36.3mm, it is the copper sheet of 1.6mm that middle bar outer surface, through-hole inner surface and end face coat thickness, the electric furnace of packing into is heated to 720 ℃, and insulation 2.5h, send into then in 1600 tons of horizontal extruders, selecting the recipient diameter for use is 150mm, extruding gauge 29mm, extrusion speed is 50～60mm/s, is squeezed into the pipe that specification is Φ 45 * 8.0mm;
With the pipe that is squeezed in electric furnace in 680 ℃ of heat treatment 40min, thereby eliminate the residual stress that produces in the pipe extrusion process, make pipe possess good plasticity; After heat treatment was finished, selecting volumetric concentration for use was 50% HNO
3Pickle soaks the copper sheet of removing the pipe remained on surface; The even part of excision pipe two wall unevenness, and adopt and manually cut the defectives such as method removal surface laps, crackle and pit of repairing to pieces, make outer surface of tube blank present trouble-free state by these processing.
The pipe tensile property is tensile strength R
m=455.0MPa, yield strength R
P0.2=280.0MPa, elongation after fracture A
50=25.0%, contraction percentage of area Z=70.0%; Microscopic structure is an equiaxed structure, and grain size is 4 grades.
3) split rolling method of pipe:
The flawless pipe of outer surface is at room temperature sent into two roller big mills carry out split rolling method, used milling train is for can carry out the rolling homemade LG60 type two-roller mill of large deformation.When the first road cogging is time rolling, milling train rotating speed 50～55 times/minute, feed is 4.0～5.0mm/ time, deflection is controlled at 45.8%, promptly is rolled down to Φ 35.0 * 5.5mm from Φ 45.0 * 8.0mm; Tubing after cold rolling is removed the greasy dirt of tube surfaces with the immersion of metal cleaner preparation cleaning fluid in ultrasonic cleaner, and (pickle is proportioning by volume, comprises 20.0% HNO with pickle
3With 6.0% HF, all the other are H
2O) clean after the tubing, in vacuum heat treatment furnace, vacuum is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 680 ℃ of heat treatment 2.0h, the air cooling of coming out of the stove when cooling to 150 ℃ then with the furnace.According to the suitable boring cutter of endoporus size Selection endoporus is carried out bore hole and handle, the monolateral depth of cut is controlled at 0.3～0.5mm, and guarantees that wall thickness deviation is in 0.2mm.
Select for use LG30 type two-roller mill to carry out the second road split rolling method, milling train rotating speed 75～78 times/minute, feed 4～5mm/ time, deflection is 63.0%, promptly is rolled down to Φ 22.0 * 3.0mm from Φ 32.0 * 5.5mm; Tubing after cold rolling is removed the greasy dirt (rolled lubricating oil) of tube surfaces with metal cleaner in ultrasonic cleaner, and with after the pickle cleaning tubing, in vacuum heat treatment furnace, vacuum is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 680 ℃ of heat treatment 1.5h, the air cooling of coming out of the stove when cooling to 150 ℃ with the furnace.
4) tubing cold rolling in the middle of
Pipe behind the split rolling method is sent into homemade LD30 type three roller finishing mills carry out the cold rolling of middle tubing, milling train rotating speed 80～90 times/minute, feed 3～4mm/ time, select continuous rolling for use, total deformation is that 52.0%: the first passage is rolled down to Φ 19.0 * 3.0mm by Φ 22.0 * 3.5mm, and second passage is rolled down to Φ 16.0 * 2.5mm by Φ 19.0 * 3.0mm; Middle tubing after cold rolling is removed the greasy dirt of tube surfaces with metal cleaner in ultrasonic cleaner after, and with the pickle rinsing (pickle proportioning by volume comprises 20.0% HNO
3With 10.0% HF, all the other are H
2O) tubing cleans the back tube surfaces and is silvery white in color, and heat-treats at vacuum heat treatment furnace, and vacuum degree control is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 700 ℃/1.0h of heat treating regime, tubing in the middle of obtaining; After finishing, heat treatment repaiies the defective of removing tube surfaces by cutting to pieces.
The tubing that to cut to pieces after repairing adopts LD15 type three roller finishing mills rolling, milling train rotating speed 50～60 times/minute, feed 2.0～2.5mm/ time, total deformation is 50.9%, carry out the rolling of continuous three passages: first passage is rolled down to Φ 14.0 * 2.3mm by Φ 16.0 * 2.5mm, second passage is rolled down to Φ 12.5 * 2.0mm by Φ 14.0 * 2.3mm, and the 3rd passage is rolled down to Φ 11.0 * 1.8mm by Φ 12.5 * 2.0mm; Middle tubing after cold rolling is removed the greasy dirt of tube surfaces with metal cleaner in ultrasonic cleaner after, and with the pickle rinsing (pickle proportioning by volume comprises 20.0% HNO
3With 10.0% HF, all the other are H
2O) tubing cleans the back tube surfaces and is silvery white in color, and heat-treats at vacuum heat treatment furnace, and vacuum degree control is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 680 ℃ of heat treatment 1.0h, tubing in the middle of obtaining; After finishing, heat treatment repaiies the defective of removing tube surfaces by cutting to pieces.
5) the finished product cold reduction of tubes
Middle tubing is carried out to the cold rolling of product tubing with homemade LD15 type three roller finishing mills, milling train rotating speed 50～60 times/minute, feed 1.5～2.0mm/ time, select two passage continuous rollings for use, total deformation is that 49.1%: the first passage is rolled down to Φ 9.5 * 1.6mm by Φ 11.0 * 1.8mm, and second passage is by the rolling Φ 8.0 * 1.25mm of Φ 9.5 * 1.6mm.The cold rolling finished product tubing that obtains is removed the greasy dirt of tube surfaces with metal cleaner liquid in ultrasonic cleaner after, (pickle proportioning by volume comprises 30.0% HNO to select pickle for use
3With 5.0% HF, all the other are H
2O) rinsing tubing, tube surfaces is silvery white in color after the rinsing; And heat-treat at vacuum heat treatment furnace: vacuum degree control is 1.0 * 10
0～1.0 * 10
1Pa, voltage rise rate≤2.0Pa/min, 520 ℃ of heat treatment 1.5h obtain finished product tubing.
Its microscopic structure of finished product tubing after the annealing is thin brilliant equiaxed structure, and grain size is 7～8 grades, and the tensile property of finished product tubing is: tensile strength R
m=430.0MPa, yield strength R
P0.2=265.0MPa, contraction percentage of area A
50=30.5%; It is 74 ° conical plunger tip that angle is adopted in enlarging, the enlarging ratio reach 50% o'clock qualified, qualified when crimping onto the distance of flattening between the surface and being 2.67mm; (long * wide * dark: 3.0 * 0.1 * 0.05mm) carry out ultrasonic examination, and qualification rate is 40.2% to hinder requirement according to labor standard.
Embodiment 4 specifications are the preparation of the aircraft engine of Φ 8 * 1mm with seamless titanium alloy tubing
The pipe that is rolled, split rolling method are identical with embodiment 1, by middle tubing to the concrete rolling step of finished product tubing are:
4) tubing cold rolling in the middle of
Pipe behind the split rolling method is sent into homemade LD30 type three roller finishing mills carry out the cold rolling of middle tubing, milling train rotating speed 80～90 times/minute, feed 3～4mm/ time, total deformation are 47.9%, select continuous rolling for use: first passage is rolled down to Φ 19.0 * 3.0mm by Φ 22.0 * 3.5mm; Second passage is rolled down to Φ 16.0 * 2.5mm by Φ 19.0 * 3.0mm; Middle tubing after cold rolling is removed the greasy dirt of tube surfaces with metal cleaner in ultrasonic cleaner after, and with the pickle rinsing (pickle proportioning by volume comprises 25.0% HNO
3With 6.5% HF, all the other are H
2O) tubing cleans the back tube surfaces and is silvery white in color, and heat-treats at vacuum heat treatment furnace, and vacuum degree control is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 630 ℃/1.0h of heat treating regime, tubing in the middle of obtaining; After finishing, heat treatment repaiies the defective of removing tube surfaces by cutting to pieces.
The tubing that to cut to pieces after repairing adopts LD15 type three roller finishing mills rolling, milling train rotating speed 50～60 times/minute, feed 2.0～2.5mm/ time, total deformation are 53.2%, and select for use continuous three passages rolling: first passage is rolled down to Φ 14.0 * 2.3mm by Φ 16.0 * 2.5mm; Second passage is rolled down to Φ 12.5 * 2.0mm by Φ 14.0 * 2.3mm, and the 3rd passage is rolled down to Φ 11.0 * 1.7mm by Φ 12.5 * 2.0mm; Middle tubing after cold rolling is removed the greasy dirt of tube surfaces with metal cleaner in ultrasonic cleaner after, and with the pickle rinsing (pickle proportioning by volume comprises 30.0% HNO
3With 10.0% HF, all the other are H
2O) tubing cleans the back tube surfaces and is silvery white in color, and heat-treats at vacuum heat treatment furnace, and vacuum degree control is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 680 ℃/1.0h of heat treating regime, tubing in the middle of obtaining; After finishing, heat treatment repaiies the defective of removing tube surfaces by cutting to pieces.
5) the finished product cold reduction of tubes
Middle tubing is carried out to the cold rolling of product tubing with homemade LD15 type three roller finishing mills, milling train rotating speed 50～60 times/minute, feed 1.5～2.0mm/ time, total deformation is 57.7%, selects for use continuous two passages rolling: first passage is rolled down to Φ 9.5 * 1.3mm second passage by Φ 11.0 * 1.7mm and is rolled down to Φ 8.0 * 1.0mm by Φ 9.5 * 1.3mm; Middle tubing after cold rolling is removed the greasy dirt of tube surfaces with metal cleaner in ultrasonic cleaner after, and with the pickle rinsing (pickle proportioning by volume comprises 15.0% HNO
3With 10.0% HF, all the other are H
2O) tubing cleans the back tube surfaces and is silvery white in color, and heat-treats at vacuum heat treatment furnace, and vacuum degree control is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 500 ℃ of heat treating regime/1.0h, tubing in the middle of obtaining; After finishing, heat treatment repaiies the defective of removing tube surfaces by cutting to pieces.
Its microscopic structure of finished product tubing after the annealing is thin brilliant equiaxed structure, and grain size is 7～8 grades, and the tensile property of finished product tubing is: tensile strength R
m=435.0MPa, yield strength R
P0.2=275.0MPa, contraction percentage of area A
50=32.5%; It is 74 ° conical plunger tip that angle is adopted in enlarging, the enlarging ratio reach 50% o'clock qualified, qualified when crimping onto the distance of flattening between the surface and being 2.67mm; (long * wide * dark: 3.0 * 0.1 * 0.05mm) carry out ultrasonic examination, and qualification rate is 43.7% to hinder requirement according to labor standard.
Embodiment 5 specifications are the preparation of the aircraft engine of Φ 6 * 1mm with seamless titanium alloy tubing
The pipe that is rolled, split rolling method are identical with embodiment 1, by middle tubing to the concrete rolling step of finished product tubing are:
4) tubing cold rolling in the middle of
Pipe behind the split rolling method is sent into homemade LD30 type three roller finishing mills carry out the cold rolling of middle tubing, milling train rotating speed 80～90 times/minute, feed 3～4mm/ time, total deformation are 50.9%, select continuous rolling for use: first passage is rolled down to Φ 19.0 * 2.5mm by Φ 22.0 * 3.0mm; Second passage is rolled down to Φ 16.0 * 2.0mm by Φ 19.0 * 2.5mm; Middle tubing after cold rolling is removed the greasy dirt of tube surfaces with metal cleaner in ultrasonic cleaner after, and with the pickle rinsing (pickle proportioning by volume comprises 26.0% HNO
3With 6.0% HF, all the other are H
2O) tubing cleans the back tube surfaces and is silvery white in color, and heat-treats at vacuum heat treatment furnace, and vacuum degree control is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 700 ℃/1.0h of heat treating regime, tubing in the middle of obtaining; After finishing, heat treatment repaiies the defective of removing tube surfaces by cutting to pieces.
The tubing that to cut to pieces after repairing adopts LD15 type three roller finishing mills rolling, milling train rotating speed 50～60 times/minute, feed 2.0～2.5mm/ time, total deformation are 57.0%, and select for use continuous three passages rolling: first passage is rolled down to Φ 14.0 * 1.8mm by Φ 16.0 * 2.0mm; Second passage is rolled down to Φ 12.0 * 1.6mm by Φ 14.0 * 1.8mm; The 3rd passage is rolled down to Φ 10.0 * 1.4mm by Φ 12.0 * 1.6mm; Middle tubing after cold rolling is removed the greasy dirt of tube surfaces with metal cleaner in ultrasonic cleaner after, and with the pickle rinsing (pickle proportioning by volume comprises 20.0% HNO
3With 10.0% HF, all the other are H
2O) tubing cleans the back tube surfaces and is silvery white in color, and heat-treats at vacuum heat treatment furnace, and vacuum degree control is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 680 ℃ of heat treatment 1.0h, tubing in the middle of obtaining; After finishing, heat treatment repaiies the defective of removing tube surfaces by cutting to pieces.
5) the finished product cold reduction of tubes
Middle tubing is carried out to the cold rolling of product tubing with homemade LD15 type three roller finishing mills, milling train rotating speed 50～60 times/minute, feed 1.5～2.0mm/ time, total deformation are 58.5%, select the rolling of continuous 3 passages for use: first passage is rolled down to Φ 8.0 * 1.2mm by Φ 10.0 * 1.4mm; The rolling Φ 7.0 * 1.1mm of the second passage Φ, 8.0 * 1.2mm; The 3rd passage is rolled down to Φ 6.0 * 1.0mm by Φ 7.0 * 1.1mm; Middle tubing after cold rolling is removed the greasy dirt of tube surfaces with metal cleaner in ultrasonic cleaner after, and with the pickle rinsing (pickle proportioning by volume comprises 15.0% HNO
3With 10.0% HF, all the other are H
2O) tubing cleans the back tube surfaces and is silvery white in color, and heat-treats at vacuum heat treatment furnace, and vacuum degree control is 1.0 * 10
-2～1.0 * 10
0Pa, voltage rise rate≤2.0Pa/h, 550 ℃ of heat treatment 1.0h, tubing in the middle of obtaining; After finishing, heat treatment repaiies the defective of removing tube surfaces by cutting to pieces.
Its microscopic structure of finished product tubing after the annealing is thin brilliant equiaxed structure, and grain size is 7～8 grades, and the tensile property of finished product tubing is: tensile strength R
m=425.0MPa, yield strength R
P0.2=285.0MPa, contraction percentage of area A
50=30.0%; It is 74 ° conical plunger tip that angle is adopted in enlarging, the enlarging ratio reach 60% o'clock qualified, qualified when crimping onto the distance of flattening between the surface and being 2.0mm; (long * wide * dark: 3.0 * 0.1 * 0.05mm) carry out ultrasonic examination, and qualification rate is 37.3% to hinder requirement according to labor standard.
Claims (9)
1. the preparation method of an aircraft engine usefulness seamless titanium alloy tubing is characterized in that, may further comprise the steps:
1) bar in the middle of ingot casting forges
Titaniferous mass fraction after the melting is not less than 99.6% titanium sponge ingot casting, be heated to 1000～1100 ℃, it is that 60～80% cogging is forged that deflection is carried out in insulation behind 4～6h, carrying out two fire after cogging is forged and finished forges, be no less than the upsetting pull of five passages during every fire forges, round as a ball after upsetting pull is finished is bar;
2) bar is squeezed into pipe in the middle of
Get out the through hole that the endoporus with extrusion tube blank adapts at middle bar center, and middle bar outer surface, through-hole inner surface and end face are coated thickness is the copper sheet of 1.0～2.0mm, be heated to 700～750 ℃ of insulation 1～3h then, again it is sent into extruder and be squeezed into pipe, extrusion speed is controlled at 50～55mm/s; Will extruding good pipe is at 650～700 ℃ of heat treatment 30～45min, after heat treatment is finished, is 30～60% HNO in volumetric concentration
3Soak to remove the copper sheet that remains in the pipe surface in the pickle, and remove lip-deep folding, crackle of pipe and pit;
3) split rolling method of pipe
The flawless pipe of outer surface is at room temperature sent into the split rolling method that two roller big mills carry out 2～3 passages, every time deflection is 45～65%, behind preceding twice split rolling method, the tubing endoporus is handled by boring cutter, after removing greasy dirt that tube surfaces adheres to after rolling the finishing and cleaning, 1.0 * 10 with pickle
-2～1.0 * 10
0600～700 ℃ of heat treatment 0.5～2.0h under the vacuum condition of Pa, voltage rise rate≤2.0Pa/h cool to the air cooling of coming out of the stove below 200 ℃ then with the furnace, check and remove external defects;
4) tube rolling in the middle of
Pipe behind the split rolling method is carried out the cold rolling of continuous 2～3 passages on the multiple roll cold pilger mill, every time cold rolling deflection is controlled at 10.0～30.0%, the total deformation of every continuous 2～3 passages is controlled at 40.0～60.0%, cold rolling back is removed the greasy dirt of tube surfaces adhesion and is cleaned with pickle, then 1.0 * 10
-2～1.0 * 10
0650～700 ℃ of heat treatment 0.5～2.0h under the vacuum condition of Pa, voltage rise rate≤2.0Pa/h cool to the air cooling of coming out of the stove below 200 ℃ with the furnace after heat treatment is finished, tubing in the middle of obtaining after inspection and the removal external defects;
5) finished product tube rolling
Middle tubing is carried out the cold rolling of continuous 2～3 passages, and every time cold rolling deflection is controlled at 10.0～30.0%, total deformation 35.0～60.0%, and cold rolling back is removed the greasy dirt of tube surfaces adhesion and is cleaned with pickle, then 1.0 * 10
-2～1.0 * 10
0500～550 ℃ of heat treatment 1.0～1.5h under the vacuum condition of Pa, voltage rise rate≤2.0Pa/h cool to the air cooling of coming out of the stove below 200 ℃ with the furnace after heat treatment is finished, obtain finished product tubing.
2. the aircraft engine as claimed in claim 1 preparation method of seamless titanium alloy tubing is characterized in that the melting of described titanium sponge ingot casting is:
Titanium sponge ingot casting raw material at 100～120 ℃ of drying 6～10h, is carried out electrode block compacting and welding titanium sponge ingot casting raw material then, again between 0.1～10.0Pa in 2500～2800 ℃ of meltings, smelting time is 2.0～5.0h; After cooling off 3.0～5.0h in a vacuum, take out ingot casting, remove surface contaminant and oxide skin, obtain the titanium sponge ingot casting after the melting.
3. the aircraft engine as claimed in claim 1 preparation method of seamless titanium alloy tubing is characterized in that: the titanium sponge ingot casting after the melting, and the impurity summation mass fraction that it comprises is not more than 0.4%, and single impurity mass fraction is not more than 0.1%.
4. the aircraft engine as claimed in claim 1 preparation method of seamless titanium alloy tubing, it is characterized in that: by mass fraction, titanium sponge ingot casting chemical composition after the melting is: Fe:0～0.06%, C:0～0.05%, N:0～0.05%, O:0～0.10%, H:0～0.01%, Si:0～0.04%, all the other are Ti.
5. the aircraft engine as claimed in claim 1 preparation method of seamless titanium alloy tubing, it is characterized in that: the intensity of pipe is 500.0～700.0Mpa, recrystallization temperature is 500～600 ℃.
6. the aircraft engine as claimed in claim 1 preparation method of seamless titanium alloy tubing is characterized in that: described bore hole is removed the inner wall defect that comprises crackle and pit, and the wall thickness deviation of guaranteeing tubing is less than 0.20～0.40mm.
7. the aircraft engine as claimed in claim 1 preparation method of seamless titanium alloy tubing is characterized in that: when bore hole processing specification was the middle tubing of Φ 30～Φ 40mm, the bore hole amount was controlled at 0.30～0.50mm.
8. aircraft engine as claimed in claim 1 is characterized in that: the HNO of described pickle occlusion body volume concentrations 15.0～30.0% with the preparation method of seamless titanium alloy tubing
3With 5.0～10.0% HF, all the other are H
2O.
9. the aircraft engine as claimed in claim 1 preparation method of seamless titanium alloy tubing, it is characterized in that: the microscopic structure of described finished product tubing is an equiaxed structure, the mean grain size of equiaxed structure is 6～8 grades.
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