CN111451423B - Manufacturing process method of titanium alloy ultrahigh-pressure-resistant spherical shell blank - Google Patents
Manufacturing process method of titanium alloy ultrahigh-pressure-resistant spherical shell blank Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- 238000005242 forging Methods 0.000 claims abstract description 61
- 238000010438 heat treatment Methods 0.000 claims abstract description 56
- 230000007704 transition Effects 0.000 claims abstract description 8
- 238000003754 machining Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 6
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- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000004040 coloring Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 238000003303 reheating Methods 0.000 description 9
- 238000011282 treatment Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 238000007493 shaping process Methods 0.000 description 5
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- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
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- 229910052751 metal Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
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- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J3/00—Lubricating during forging or pressing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
- B21J5/025—Closed die forging
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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Abstract
A manufacturing process method of a titanium alloy ultrahigh pressure-resistant spherical shell blank specifically comprises the following steps; step 1, preparing a die: step 2, preparing a blank: step 3, heating: step 4, die forging: step 5, heat treatment: and (4) carrying out triple heat treatment on the forged piece obtained in the step (4), wherein the temperature of the first heat treatment is 20-80 ℃ below the phase transition point, the temperature of the second heat treatment is 500-850 ℃, and the temperature of the third heat treatment is 500-650 ℃ before final finish machining of the pressure-resistant spherical shell. Compared with the conventional die forging process, the process for forming the product by die forging basically omits the manufacture of the upper die, simplifies the manufacture of the lower die, reduces the processing time of the die by 2 weeks and improves the production efficiency by 50 percent; the cost of the die is reduced, the tonnage of forging equipment is reduced, the cost can be reduced by more than 40%, and the manufactured spherical shell blank has high comprehensive performance.
Description
Technical Field
The invention belongs to the field of metal material hot working process manufacturing methods, and particularly relates to a manufacturing method of a titanium alloy ultrahigh pressure-resistant spherical shell blank.
Background
The ocean covers 71 percent of the earth surface, surveys ocean resources, surveys submarine minerals, rescues lost submarine sailors, salvages submarine valuable instruments and equipment, carries out underwater equipment construction, inspection and maintenance and the like, which are important contents for ocean development in advanced countries in the world, and the deep submergence device is a powerful tool for deep sea research. Compared with other materials, the titanium alloy has the advantages of high specific strength, good high and low temperature performance, seawater corrosion resistance and the like, so the titanium alloy is always the preferred material for manufacturing the marine deep submergence vehicles. The titanium alloy pressure-resistant spherical shell is the most critical component on the deep submersible vehicle, and the submergence depth, the submergence range and the service life of the deep submersible vehicle are directly determined by the comprehensive performance (the comprehensive performance determines the weight).
The titanium alloy ultrahigh pressure-resistant spherical shell for the deep submersible has the general comprehensive performance indexes that:
1) tensile Strength R at Room temperaturep0.2、Rm；
2) Room temperature compressive strength Rpc0.2、Rmc；
3) Room temperature plasticity A, Z;
4) hardness;
5) impact toughness KV2/KU2；
6) Plane strain fracture toughness KIC；
7) Stress corrosion cracking susceptibility test KISCC；
8) Fatigue crack propagation rate da/dN;
9) high, low ploidy tissue, etc.
The patent entitled "a simple seal head forming process for titanium alloy gas cylinder" by the seventh second fifth research institute of the company of the ship re-engineering group of China (patent number: ZL 200910227725.3) proposes a seal head forming process, which can also be used for manufacturing a common titanium alloy pressure-resistant spherical shell, namely, a plate (plate blank) is adopted for punch forming, but a blank manufactured by the method has the following defects in the aspect of comprehensive performance of the titanium alloy, which cannot be overcome:
1) the plate (plate blank) is used as a raw material for forming, so that the longitudinal and transverse performance difference of the plate (plate blank) cannot be overcome, and the imbalance of the performance of the pressure-resistant spherical shell body in each direction is caused.
2) The pressure-resistant spherical shell blank formed by the plate (plate blank) has larger defects such as internal linear cracks, cavities and the like (compared with a forging blank) detected by nondestructive testing.
3) The deformation of the pressure-resistant spherical shell blank formed by the stamping process is small (compared with a forging blank), and the comprehensive performance of the pressure-resistant spherical shell cannot be effectively improved.
4) Part of performance indexes can meet the index requirements, but part of performance can not meet the index requirements, and the comprehensive performance is poor.
In general pressure-resistant spherical shells, the defects of plate (slab) stamping forming have little influence on the use of the pressure-resistant spherical shells, but in the case of ultrahigh pressure-resistant spherical shells, the method cannot be sufficient, so that a new process method is urgently needed to manufacture titanium alloy ultrahigh pressure-resistant spherical shell blanks.
The performance of the pressure-resistant spherical shell is closely related to the corresponding heat treatment process besides the forming process.
A paper of Maringer and the like of the titanium alloy research department of the institute of metals of Chinese academy of sciences, namely the influence of multiple heat treatments on the structure and mechanical properties of TC4 alloy (the paper of materials research, 10 months 2008) adopts a phi 85mm bar to carry out 6 groups of multiple heat treatment tests at the temperature above a phase transition point, and only 5 properties including strength, plasticity, plane strain fracture toughness, fatigue crack propagation rate and structure are analyzed in the paper, and the result shows that the alloy structure obtained by the heat treatment process of the paper is a Widmanschner structure with coarse grains, and the alloy has good other properties but poor shaping (A: 8.8-13%, Z: 11-23%).
The influence of heat treatment on the structural performance of TC4-DT titanium alloy is carried out in a paper of Yanghaiying, etc. (Material development and application, 2009, 4 months) of northwest non-ferrous metal institute, 3 groups of double heat treatment tests are carried out on a phi 300mm bar at the temperature below a transformation point, and the paper only analyzes the strength, the plasticity, the plane strain fracture toughness, the fatigue crack propagation rate and 5 properties of the structure, and the result shows that the alloy structure obtained by the heat treatment process is a two-state structure, and the alloy has poor shaping (A: 8-11%, Z: 27-43%) although other properties are good.
The results of 6 groups of double or multiple heat treatment tests on the structure and performance of a Ti-6Al-4V ELI alloy thick plate by adopting a plate with the specification of 30 multiplied by 300 multiplied by 250mm in a treatise on Lihui et Al (rare metals, 12 months 2005) of northwest university of industry show that the alloy structure obtained by the heat treatment process in the treatise is a Widmanschner structure or a two-state structure with coarse grains, the alloy is better in shaping (11.5-16.5% of A and 27.5-50% of Z), but the two performances of strength and plane strain fracture toughness cannot be better at the same time, if the strength is higher, the plane strain fracture toughness is lower (76.71), and if the plane strain fracture toughness is higher, the strength is lower (R)m=915MPa，Rp0.2=835MPa，）。
The above data show that the heat treatment process of the existing data cannot obtain the comprehensive performance required by the ultrahigh pressure resistant spherical shell, and in addition, the specification of raw materials for data test is relatively small, and the heat treatment process is not suitable for manufacturing the ultrahigh pressure resistant spherical shell with a large size, so that a new heat treatment process is also urgently needed to be matched with the forging forming process to achieve the manufacturing requirement of the titanium alloy ultrahigh pressure resistant spherical shell blank.
Disclosure of Invention
In order to solve the technical problem, the invention provides a manufacturing process method of a titanium alloy ultrahigh pressure-resistant spherical shell blank, which is used for manufacturing a spherical shell blank with high comprehensive performance and large specification.
In order to realize the technical purpose, the adopted technical scheme is as follows: a manufacturing process method of a titanium alloy ultrahigh pressure resistant spherical shell blank is used for manufacturing the titanium alloy ultrahigh pressure resistant spherical shell blank by utilizing a spherical shell die and a forming process, and specifically comprises the following steps;
step 5, heat treatment: and (4) carrying out triple heat treatment on the forged piece obtained in the step (4), wherein the temperature of the first heat treatment is 20-80 ℃ below the phase transition point, the temperature of the second heat treatment is 500-850 ℃, and the temperature of the third heat treatment is 500-650 ℃ before final finish machining of the pressure-resistant spherical shell.
The inspection mode of the surface cracks of the blank is peeling, visible light and coloring inspection.
When the heating temperature is 20-80 ℃ below the transformation point, the heat preservation time is calculated according to 0.8-1.2 min/mm along the thickness direction.
And a laser thermodetector is adopted to measure the temperature of the surface of the blank in the die forging process so as to ensure that the temperature of the blank is always kept within the range of the hot forming temperature of the titanium alloy during forming.
The invention has the beneficial effects that: the ultrahigh pressure resistant spherical shell manufactured by the manufacturing process method of the titanium alloy ultrahigh pressure resistant spherical shell blank meets the requirements of various technical indexes at lower manufacturing cost, and practice shows that the process is very successful, not only meets the requirements of various performance indexes of the product, but also greatly improves the performance indexes. Through carrying out nondestructive test on the spherical shell blank, no obvious defect exists in the blank. The metallographic structure of the titanium alloy obtained after the heat treatment is as follows: the equiaxial primary alpha phase + beta transition structure consists of lamellar secondary alpha phase and residual beta phase which are distributed in a basket-shaped staggered manner. The performance of the ultrahigh pressure resistant spherical shell blank manufactured by adopting the alpha + beta type titanium alloy is shown in the table 1:
TABLE 1 titanium alloy ultra-high pressure resistant spherical shell Performance Table
As can be seen from Table 1, higher impact toughness and plane strain fracture toughness K are obtained under the condition of ensuring high strength and shaping of the pressure-resistant spherical shellICStress corrosion cracking susceptibility test KISCCAnd the like, so that excellent combination of comprehensive properties is achieved.
Compared with the conventional die forging process, the process for forming the product by die forging basically omits the manufacture of the upper die, simplifies the manufacture of the lower die, reduces the processing time of the die by 2 weeks and improves the production efficiency by 50 percent; the cost of the die is reduced, the tonnage of forging equipment is reduced, and the cost can be reduced by more than 40%.
Drawings
FIG. 1 is a schematic view of a spherical shell blank of the present invention;
FIG. 2 is a schematic structural diagram of a spherical shell lower die and a steel hemisphere upper die of the invention;
FIG. 3 is a schematic view of the forming process of the present invention;
FIG. 4 is a high and low power structure diagram of the titanium alloy ultra-high pressure resistant spherical shell of example 1 after heat treatment;
in the figure: 1. the device comprises a spherical shell lower die, a spherical shell upper die, a spherical shell lower die, a spherical shell upper die, 3, a press, 4 and a blank.
Detailed Description
The invention relates to equipment required in the production process of a titanium alloy ultrahigh pressure-resistant spherical shell blank, which comprises the following steps: a box-type resistance furnace, an oil pressure forming machine and a laser temperature measuring instrument.
The blank schematic diagram of the titanium alloy ultrahigh pressure resistant spherical shell is shown in the attached figure 1.
The invention is suitable for manufacturing titanium alloy ultrahigh pressure resistant spherical shell blanks with the specification of phi 200-phi 600 mm.
The manufacturing method of the titanium alloy ultrahigh pressure-resistant spherical shell blank comprises the following steps:
1) mold design and fabrication
The die of the invention is designed by adopting 1 spherical shell lower die and 1 common steel hemispherical upper die (non-titanium alloy special die steel) for die forging. Compared with an upper die made of special die steel for titanium alloy, 1 common steel hemisphere is used as the upper die, so that the manufacturing cost of the die can be obviously reduced. In addition, the design of the spherical shell lower die adopts a penetrating type die ring, so that the manufacturing cost of the die can be greatly reduced. During forging, the lower spherical shell die can move on the equipment platform, and a partial free forging function can be adopted, so that the tonnage of forging equipment is greatly reduced, and the purpose of reducing the cost again is achieved.
The schematic diagram of the titanium alloy ultrahigh-pressure-resistant spherical shell blank forging die is shown in the attached figure 2.
2) Preparation of the blank before forging
a. The blank is firstly processed by peeling and visible light and is subjected to coloring inspection so as to prevent cracks on the surface of the blank from being brought into the spherical shell blank.
b. And chamfering the two ends of the blank to prevent the quality of the spherical shell blank from being influenced by too fast cooling of the corner of the blank.
c. The special glass lubricant is coated on the surface of the blank before heating, so that the frictional resistance between the blank and a die is reduced, the oxidation of the blank is reduced, and the temperature drop of the blank in the contact process with the die during forging is reduced.
3) Heating of
The electric furnace is adopted for heating, so that the damage of harmful atmosphere to the performance of the titanium alloy is prevented. Stainless steel plates are required to be arranged in the furnace for placing blanks, so that the pollution of furnace slag and the like in the furnace to the surface of the titanium alloy is avoided. The heating temperature is 20-80 ℃ below the transformation point, and the heat preservation time is calculated according to 0.8-1.2 min/mm along the thickness direction.
4) Die forging
The mold is preheated to 200-300 ℃ before forming, so that the phenomenon that the temperature difference between the mold and the blank is too large, and the blank is locally chilled is avoided.
When in die forging, the blank is basically forged into the lower die cavity of the spherical shell to fill most of the lower die cavity of the spherical shell; and then moving the spherical shell lower die, forging the lower die part in a free forging mode, and placing the hemispherical upper die for final forging under the condition of basically meeting the requirement of filling the lower die until the lower die is completely filled.
And a laser thermodetector is adopted to measure the temperature of the surface of the blank in the die forging process so as to ensure that the temperature of the blank is always kept within the range of the hot forming temperature of the titanium alloy during forming.
The schematic drawing of the die forging forming process of the titanium alloy ultrahigh pressure resistant spherical shell blank is shown in the attached figure 3.
5) Thermal treatment
According to the requirements of various properties of a blank forging, combined with various process parameters in the die forging process and subsequent machining stress elimination requirements, a triple heat treatment process is worked out, wherein the first heat treatment temperature is 20-80 ℃ below the phase transition point, the second heat treatment temperature is 500-850 ℃, and the third heat treatment is carried out before final finish machining of the pressure-resistant spherical shell, and the temperature is 500-650 ℃.
By the heat treatment process, the alpha + beta type titanium alloy with high-power metallographic structure can be obtained as follows: the equiaxed primary alpha phase + beta transition structure is composed of lamellar secondary alpha phase and residual beta phase which are distributed in a basket-shaped staggered manner, and is shown in the attached figure 4. The structure ensures that the titanium alloy has higher strength, shaping and other properties, and particularly, the lamellar secondary alpha phase distributed in a basket-shaped staggered manner can gradually increase the propagation path of the fracture crack, so that the energy required by the crack propagation is gradually increased, and finally the properties of the alloy, such as impact toughness, fracture toughness and the like, are improved. Thus, the titanium alloy pressure-proof spherical shell blank can achieve excellent combination of comprehensive properties.
Example 1:
the invention has been applied to the manufacture of TC4 ELI titanium alloy ultra-high pressure-resistant spherical shell with phi 360 specification.
1) The outer diameter of the forging piece with the specification is 360mm, the outer diameter of the maximum flange is 450mm, and the thickness of a finish machining spherical shell is 20 mm.
2) And after blanking, the blank is subjected to laser irradiation and chamfering, and then the surface of the blank is coated with a Ti-5 glass lubricant.
3) Heating in an electric furnace, placing stainless steel in the furnace, heating to 950 +/-10 ℃, and keeping the temperature for 1min/mm when the temperature is reached.
4) Preheating the die to 280 +/-20 ℃, and coating a graphite water solution on the surface of the lower die for proper lubrication in the die forging process.
5) And (3) measuring the temperature of the surface by using a laser thermometer to ensure that the forming temperature is kept above 750 ℃.
6) The heat treatment process comprises the following steps: the 1 st reheating treatment temperature is 930 ℃ plus or minus 10 ℃, the 2 nd reheating treatment temperature is 760 ℃ plus or minus 10 ℃, and the 3 rd reheating treatment temperature is 560 ℃ plus or minus 10 ℃.
The performance of the ultrahigh-pressure-resistant spherical shell blank forging body manufactured by the method is shown in Table 2, the overall performance is far better than the requirements of national standard (GB/T25137-p0.2The pressure is higher than the national standard requirement by 126MPa, and finally the spherical shell successfully passes the check test of 140MPa ultrahigh pressure.
TABLE 2 TC4 ELI titanium alloy pressure-resistant spherical shell blank properties
The metallurgical structure of the TC4 ELI alloy obtained after the heat treatment is an equiaxial primary alpha phase + beta transformation structure, and the beta transformation structure consists of flaky (net-shaped) secondary alpha phases and residual beta phases which are distributed in a staggered mode, and is shown in the attached drawing 4.
Compared with the conventional die forging process, the process for forming the product by die forging basically omits the manufacture of the upper die, simplifies the manufacture of the lower die, reduces the processing time of the die by 2 weeks and improves the production efficiency by 50 percent; the cost of the die is reduced, the tonnage of forging equipment is reduced, and the cost can be reduced by more than 45%. Meanwhile, the comprehensive performance obtained is higher than that obtained by conventional die forging.
Example 2:
the invention has been applied to the manufacture of TC4 titanium alloy ultra-high pressure resistant spherical shell with the specification of phi 560.
1) The outer diameter of the forging with the specification is 560mm, and the inner diameter is 400 mm.
2) And after blanking, the blank is subjected to laser irradiation and chamfering, and then the surface of the blank is coated with a Ti-6 glass lubricant.
3) Heating in an electric furnace, placing stainless steel in the furnace, heating to 960 + -10 deg.C, and holding for 1 min/mm.
4) Preheating the die to 280 +/-20 ℃, and coating a graphite water solution on the surface of the lower die for proper lubrication in the die forging process.
5) And (3) measuring the temperature of the surface by using a laser thermometer to ensure that the forming temperature is kept above 750 ℃.
6) The heat treatment process comprises the following steps: the 1 st reheating treatment temperature is 950 ℃ plus or minus 10 ℃, the 2 nd reheating treatment temperature is 760 ℃ plus or minus 10 ℃, and the 3 rd reheating treatment temperature is 560 ℃ plus or minus 10 ℃.
The performance of the ultrahigh-pressure-resistant spherical shell blank forging body manufactured by the method is shown in Table 3, and the overall performance is far superior to the requirements of national standards (GB/T16598-2013).
TABLE 3 TC4 titanium alloy pressure-resistant spherical shell blank properties
Compared with the conventional die forging process, the process for forming the product by die forging basically omits the manufacture of the upper die, simplifies the manufacture of the lower die, reduces the processing time of the die by 2 weeks and improves the production efficiency by 50 percent; the cost of the die is reduced, the tonnage of forging equipment is reduced, and the cost can be reduced by more than 45%. Meanwhile, the comprehensive performance obtained is higher than that obtained by conventional die forging.
Example 3:
the invention has been applied to the manufacture of TA31 titanium alloy ultra-high pressure resistant spherical shell with the specification of phi 300.
1) The outer diameter phi of the spherical shell forging piece with the specification is 300mm, and the inner diameter phi of the spherical shell forging piece with the specification is 190 mm.
2) And after blanking, the blank is subjected to laser irradiation and chamfering, and then the surface of the blank is coated with a Ti-1 glass lubricant.
3) Heating with an electric furnace, placing stainless steel in the furnace, heating to 970 +/-10 ℃, and keeping the temperature for 1min/mm when the temperature is reached.
4) Preheating the die to 280 +/-20 ℃, and coating a graphite water solution on the surface of the lower die for proper lubrication in the die forging process.
5) And (3) measuring the temperature of the surface by using a laser thermometer to ensure that the forming temperature is kept above 750 ℃.
6) The heat treatment process comprises the following steps: the 1 st reheating treatment temperature is 960 ℃ +/-10 ℃, the 2 nd reheating treatment temperature is 650 +/-10 ℃, and the 3 rd reheating treatment temperature is 560 ℃ +/-10 ℃.
The performance of the ultrahigh pressure resistant spherical shell blank forging body manufactured by the method is shown in Table 4, and the overall performance is far superior to the requirements of national standard (GB/T35364-2017).
TABLE 4 TA31 titanium alloy pressure-resistant spherical shell blank properties
Compared with the conventional die forging process, the process for forming the product by die forging basically omits the manufacture of the upper die, simplifies the manufacture of the lower die, reduces the processing time of the die by 2 weeks and improves the production efficiency by 50 percent; the cost of the die is reduced, the tonnage of forging equipment is reduced, and the cost can be reduced by more than 45%.
Claims (4)
1. A manufacturing process method of a titanium alloy ultrahigh pressure-resistant spherical shell blank is characterized by comprising the following steps: the manufacturing of the titanium alloy ultrahigh pressure resistant spherical shell blank is completed by utilizing a spherical shell mold and a forming process, and the method specifically comprises the following steps;
step 1, preparing a die: a spherical shell lower die is matched with a steel hemisphere upper die for die forging;
step 2, preparing a blank: inspecting and removing the blank with cracks on the surface, chamfering the qualified blank and coating a glass lubricant on the surface;
step 3, heating: heating by adopting an electric furnace, placing a stainless steel plate in the electric furnace, placing a blank, and heating;
step 4, die forging: preheating a mold to 200-300 ℃ before forming, and forging a blank into a lower mold cavity of the spherical shell to fill most of the lower mold cavity when forging; then forging the blank by moving the spherical shell lower die, and placing the steel hemisphere upper die for final forging until the blank is completely filled under the condition that the filling of the spherical shell lower die is basically met;
step 5, heat treatment: and (4) carrying out triple heat treatment on the forged piece obtained in the step (4), wherein the temperature of the first heat treatment is 20-80 ℃ below the phase transition point, the temperature of the second heat treatment is 500-850 ℃, and the temperature of the third heat treatment is 500-650 ℃ before final finish machining of the pressure-resistant spherical shell.
2. The manufacturing process method of the titanium alloy ultrahigh pressure-resistant spherical shell blank as claimed in claim 1, characterized in that: the inspection mode of the surface cracks of the blank is peeling, visible light and coloring inspection.
3. The manufacturing process method of the titanium alloy ultrahigh pressure-resistant spherical shell blank as claimed in claim 1, characterized in that: the heating temperature in the step 3 is 20-80 ℃ below the phase transition point, and the heat preservation time is calculated according to 0.8-1.2 min/mm along the thickness direction.
4. The manufacturing process method of the titanium alloy ultrahigh pressure-resistant spherical shell blank as claimed in claim 1, characterized in that: and a laser thermodetector is adopted to measure the temperature of the surface of the blank in the die forging process so as to ensure that the temperature of the blank is always kept within the range of the hot forming temperature of the titanium alloy during forming.
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| JP2643765B2 (en) * | 1993-03-31 | 1997-08-20 | 住友金属工業株式会社 | Manufacturing method of hemispherical titanium alloy forgings |
| CN101693279B (en) * | 2009-10-20 | 2012-05-02 | 西安西工大超晶科技发展有限责任公司 | Upsetting-extruding precision die forging forming method for large titanium alloy deep cylinder part |
| CN101745784B (en) * | 2009-12-21 | 2011-06-08 | 中国船舶重工集团公司第七二五研究所 | Simple forming process of seal head for titanium alloy cylinder |
| CN102758159B (en) * | 2012-08-02 | 2014-03-12 | 西北工业大学 | Method for acquiring titanium alloy tristate structure by forging and heat treatment |
| CN102963100B (en) * | 2012-11-16 | 2015-04-08 | 中国船舶重工集团公司第七二五研究所 | Manufacturing method for titanium and titanium alloy products by coating and forming |
| CN103252434A (en) * | 2013-04-24 | 2013-08-21 | 安徽铖友汽车零部件制造有限公司 | Forging technology of bell housing |
| CN104923603B (en) * | 2015-06-23 | 2017-03-08 | 宝鸡钛业股份有限公司 | Bathyscaph manned sphere is with pressure titanium alloy hemisphere preparation technology |
| CN108057758B (en) * | 2017-12-08 | 2019-08-09 | 航天材料及工艺研究所 | A kind of superplasticity isothermal stamping process of TA7 titanium alloy thick spherical shell |
| CN207723402U (en) * | 2017-12-13 | 2018-08-14 | 陕西宏远航空锻造有限责任公司 | A kind of forging mold of large titanium alloy casing class forging part |
| CN110273118B (en) * | 2019-06-14 | 2020-12-29 | 中国航发北京航空材料研究院 | Heat treatment process of titanium alloy |
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2020
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