CN102085556B - Roll forming method of GH4033 high-temperature alloy thin-wall ring piece - Google Patents
Roll forming method of GH4033 high-temperature alloy thin-wall ring piece Download PDFInfo
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- CN102085556B CN102085556B CN2010105821942A CN201010582194A CN102085556B CN 102085556 B CN102085556 B CN 102085556B CN 2010105821942 A CN2010105821942 A CN 2010105821942A CN 201010582194 A CN201010582194 A CN 201010582194A CN 102085556 B CN102085556 B CN 102085556B
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- 239000000956 alloy Substances 0.000 title claims abstract description 34
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005096 rolling process Methods 0.000 claims abstract description 59
- 230000002093 peripheral effect Effects 0.000 claims description 16
- 238000007493 shaping process Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910001069 Ti alloy Inorganic materials 0.000 abstract description 3
- 238000005242 forging Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000601 superalloy Inorganic materials 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 208000004350 Strabismus Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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Abstract
The invention discloses a roll forming method of a GH4033 high-temperature alloy thin-wall ring piece, wherein the thin-wall ring piece is roll-formed and has high size precision and excellent structure and performance. The technical is as follows: sleeving a titanium alloy pre-rolled blank which is heated to a deforming temperature and a pre-heated follow-up mould sleeve into a ring rolling mill; sleeving the follow-up mould sleeve in the pre-rolled blank; positioning the follow-up mould sleeve and the pre-rolled blank by utilizing a main roller, a core roller, holding rollers and upper and lower conical rollers of the ringrolling mill; and starting the ring rolling mill, wherein the core roller of the ring rolling mill performs radial feed motion toward the main roller and rolls the pre-rolled blank together with the main roller under the support of the follow-up mould sleeve with a rolling force of 220-4,200 KN so that the pre-rolled blank is widened radially at a speed of 5-8 mm/s and the wall thickness is gradually reduced; and after the deformation of the pre-rolled blank reaches 25-45%, the pre-rolled blank is rolled into a thin-wall ring piece. The minimum of the wall thickness of the titanium alloy thin-wall ring piece roll-formed by the method is 25 mm, and the maximum of the height-thickness ratio is 25 mm; and the ring piece is mainly applied to the rotational parts such as a cylindrical shell and the like used in the fields of aerospace and the like..
Description
Technical field
The present invention relates to a kind of roll-forming method of annular forging piece, particularly related to the method for rolling and shaping of GH4033 high temperature alloy thin-walled ring.
Background technology
The GH4033 high temperature alloy is to be the ni-base wrought superalloy of matrix with nickel-chromium; The revolving body parts such as barrel-type casing that use in the fields such as Aero-Space of adopting this alloy hoop to roll into shape; The thin-walled rings such as front housing of aero-engine for example; Requirement has enough elevated temperature strengths when using for 700～750 ℃ long-term, when long-term work below 900 ℃, have good non-oxidizability.When rolling, because the alloy deformation temperature range is narrower, deflection is less, and the forging wall thickness is thinner, and dimensional accuracy, performance and tissue are had relatively high expectations, and have increased the difficulty of roll forming.
On October 8th, 2008, disclosed Chinese invention patent specification CN 101279346A disclosed a kind of method for rolling and shaping of nickel-based high-temperature alloy special-shaped ring rolling spare; This method by the alloy bar of specification blanking through jumping-up, punching, roll ring base (not using the roll off mould) for twice; Put into rolling and shaping in the machine for rolling ring roll off mould to blank again; Through taking the mode of small deformation amount shaping and the deflection of precise control in each processing step, tissue and well behaved special-shaped ring have been rolled out double rolling in the ring base process.When adopting the thin GH4033 high temperature alloy thin-walled ring of the rolling wall thickness of this method; Because the roll off mould is fixed on (being on home roll and the core roller) on the roll; The pass of roll off mould and produce in advance fierce friction between the strip plate and make not only that the operation of rolling is very unstable to impact production when rolling; But also cause preparatory strip plate temperature to raise easily alloy organizing and performance are exerted an influence, like defectives such as tissue occurring and make a variation, crystal grain is thick.
When the GH4033 high temperature alloy thin-walled ring of home roll that adopts said method and direct use machine for rolling ring and core rolling system (encircling base) thin-walled like rolling in the above-mentioned method; Owing to receive the influence of the parts rigidity such as core roller of machine for rolling ring; The rigidity of structure that adds the thin-walled ring is relatively poor less with allowance; Be prone to cause preparatory strip plate plastic instability to occur and produce phenomenons such as draw down, horn mouth in the operation of rolling; Cause the ring shape and size not reach that design is used or machined requirement and scrapping, this loses bigger concerning expensive GH4033 high-temperature alloy material.
In the roll off process; In advance strip plate has just begun when rolling owing to embrace the roller skew to its rotation direction one side earlier; The roller of embracing to opposite side squints again; Make preparatory strip plate that the phenomenon that roller swings of embracing towards its both sides arranged in the operation of rolling, receive to embrace roller and help the reaction force that produces to influence, ring is scrapped by draw down easily.
Summary of the invention
The technical problem that the present invention will solve provides a kind of method for rolling and shaping that adopts the servo-actuated die sleeve to realize GH4033 high temperature alloy thin-walled ring, and it is high and have a thin-walled ring of good tissue and performance to adopt this method can roll out dimensional accuracy.
For solving the problems of the technologies described above, the method for rolling and shaping of GH4033 high temperature alloy thin-walled ring according to the invention, its technical scheme may further comprise the steps:
The deformation temperature of heating GH4033 high temperature alloy preparatory strip plate to 1110 ℃～1130 ℃, the temperature of and preheating servo-actuated die sleeve to 280 ℃～330 ℃;
Put into machine for rolling ring to said preparatory strip plate and servo-actuated die sleeve; Make preparatory strip plate entangle that servo-actuated die sleeve, servo-actuated die sleeve entangle the core roller and along between the outer peripheral face of the preparatory strip plate of centre-to-centre spacing direction of home roll and core roller and home roll, distinguish tangent the contact between the outer peripheral face of inner ring surface and the servo-actuated die sleeve of strip plate and between the outer peripheral face of the inner ring surface of servo-actuated die sleeve and core roller in advance; Strip plate is embraced roller in its outer peripheral face support by two in advance, epicone roller and the upper and lower end face clamping servo-actuated die sleeve and preparatory strip plate of following awl roller along servo-actuated die sleeve and preparatory strip plate;
Starting machine for rolling ring makes its home roll rotation and drives preparatory strip plate, servo-actuated die sleeve, core roller and two armfuls of rollers rotations; Grasping the servo-actuated die sleeve by machine for rolling ring driving epicone roller and following awl roller simultaneously rotates with preparatory strip plate together; The core roller is radially done feed motion and with roll-force under the support of servo-actuated die sleeve the roll off preparatory strip plate of home roll with 220KN～4200KN towards the home roll direction; In advance strip plate is with the speed of 5mm/s～8mm/s broadening radially; Wall thickness reduces gradually, and its deflection reaches 25%～45% back and become the thin-walled ring by roll off.
And said servo-actuated die sleeve is when design, and its minimum wall thickness (MINI W.) is calculated as follows:
D
0＝L-D
1-R
1-R
2
In the formula: D
0Minimum wall thickness (MINI W.) for the servo-actuated die sleeve;
L is the minimum centers-distance of home roll and core roller;
D
1Radially minimum wall thickness (MINI W.) for the thin-walled ring;
R
1Radius for home roll;
R
2Radius for the core roller.
Adopt the thin-walled ring of above-mentioned method for rolling and shaping roll forming, its wall thickness minimum of a value is 25mm, and the maximum of ratio of height to thickness is 25.
Compared with prior art, beneficial effect of the present invention is following:
The present invention is the preparatory strip plate of GH4033 high temperature alloy that is heated to deformation temperature with after the servo-actuated die sleeve cover of preheating is put into the machine for rolling ring location; Radially do feed motion and its distortion is shaped by its core roller, obtained the thin-walled ring of thin-walled and tissue and function admirable with home roll preparatory strip plate of roll off under the support of servo-actuated die sleeve towards the home roll direction.
In the roll off process, because the servo-actuated die sleeve has only carried out The pre-heat treatment, it almost can not be out of shape in the operation of rolling.When rolling since in advance between strip plate and the core roller at a distance from one deck servo-actuated die sleeve; And the servo-actuated die sleeve is therewith rotating in the strip plate in advance in the same way; Overcome between preparatory strip plate and the servo-actuated die sleeve since produce fierce friction make the operation of rolling unstable with the phenomenon that is prone to cause preparatory strip plate temperature to raise, thereby help that tissue is produced and the acquisition quality forging.
In the roll off process; Because in advance the inner ring surface of strip plate is close on the outer peripheral face of servo-actuated die sleeve and therewith in the same way, rotate synchronously; Avoided preparatory strip plate to receive the influence of core roller rigid parts; Thereby avoid it plastic instability to occur and produce phenomenons such as draw down, horn mouth; And with preparatory strip plate in the same way, the servo-actuated die sleeve that rotates synchronously also can carry out full circle to the inner ring surface of preparatory strip plate and prevent its draw down and phenomenon such as horn mouth occurs, can realize the high ring of precision rolling forming dimension precision, saves valuable titanium alloy material.
In the roll off process,, preparatory strip plate has been played supported preferably and firm effect, thereby can effectively alleviate preparatory strip plate phenomenon that roller swings of embracing towards its both sides in the operation of rolling, prevented that ring from being scrapped by draw down owing in advance be set with the servo-actuated die sleeve in the strip plate.
Through detecting the dimensional accuracy of this alloy thin-wall ring, 3 ‰ (3/1000ths) of corresponding size have been reached.
Through detecting the room temperature tensile performance of this alloy thin-wall ring; Its tensile strength is 1050MPa (greater than the 804MPa of design instructions for use); Percentage elongation is that 0.2% o'clock yield strength is 730MPa (greater than the 588MPa of design instructions for use); Elongation after fracture be 28% (greater than the design instructions for use 10%), the contraction percentage of area be 36% (greater than the design instructions for use 13%), ballistic work is 677J (greater than the 294J/ of design instructions for use).
Through detecting the high temperature endurance performance of this alloy thin-wall ring, this alloy rings is that 750 ℃, proof stress are to reach 343MPa, duration in 51 hours disconnectedly in test temperature, has satisfied the design instructions for use.
Through detecting the metallographic structure of this alloy thin-wall ring, reached the requirement of " aviation is with superalloy annular spare standard " (GJB 5301) standards.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further explain.
Fig. 1 is the perspective view of the preparatory strip plate of GH4033 high temperature alloy.
Fig. 2 is the installation location and the roll off view of servo-actuated die sleeve and preparatory strip plate.
Fig. 3 is the perspective view that preparatory strip plate roll off becomes the thin-walled ring.
The specific embodiment
The method for rolling and shaping of the described GH4033 high temperature alloy of embodiment of the present invention thin-walled ring need provide equipment such as forge furnace, forcing press, machine for rolling ring, manipulator.
The main chemical elements content (percentage by weight) of this alloy is: C content 0.03%～0.08%, contain Cr amount 19.0%～22.0%, contain Al amount 0.60%～1.00%, contain Ti amount 2.40%～2.80%, contain Fe amount≤4.0%, contain B amount≤0.010%, contain Ce amount≤0.010%, contain Mn amount≤0.35%, si content≤0.65%, P content≤0.015%, contain S amount≤0.007%, surplus is Ni.
This alloy is following to the processing step of producing qualified thin-walled ring from bar:
Step 1: base.
By the GH4033 high temperature alloy bar of specification blanking through heating, jumping-up, punching, pulling, produce 10 ° of preparatory strip plates after rolling in advance, its shape is as shown in Figure 1.
Step 2: installation.
As shown in Figure 2; In forge furnace, be heated to 10 ° of preparatory strip plates and put into machine for rolling ring after 1110 ℃～1130 ℃ the deformation temperature and to lie in (not shown) on the chassis of this machine; Preparatory 10 ° of core rollers 2 that pack into machine for rolling ring of strip plate; The home roll 1 of its outer peripheral face and machine for rolling ring and two tangent contacts of outer peripheral face of embracing rollers 3 are embraced 3 pairs of preparatory strip plates of roller for two and are played supporting roles for 10 °; In forge furnace, be preheating to servo-actuated die sleeve 4 simultaneously and put into (not shown) on the chassis that lies in this machine after machine for rolling ring packs into the core roller 2 of machine for rolling ring and is enclosed within 10 ° of the preparatory strip plates after 280 ℃～330 ℃, in advance between the outer peripheral face of the outer peripheral face of 10 ° of strip plates and home roll 1, in advance between the outer peripheral face of inner ring surface and the servo-actuated die sleeve 4 of 10 ° of strip plates, between the outer peripheral face of the inner ring surface that reaches servo-actuated die sleeve 4 and core roller 2 all along tangent contact of centre-to-centre spacing direction of core roller 2 and home roll 4; The startup machine for rolling ring makes its epicone roller 5 and the upper and lower end face clamping servo-actuated die sleeve 4 and preparatory strip plate 10 ° of following awl roller 6 along servo-actuated die sleeve 4 and 10 ° of preparatory strip plates, the installation location of accomplishing servo-actuated die sleeve 4 and 10 ° of preparatory strip plates.The shipment of workpiece is mainly accomplished through Robot actions during installation.
Step 3: roll off.
Starting machine for rolling ring makes its home roll 1 rotate by direction shown in Figure 2; Home roll 1 drives 10 ° of preparatory strip plates, servo-actuated die sleeve 4, core roller 2 and two armfuls of rollers 3 and rotates by direction shown in Figure 2; Simultaneously drive by machine for rolling ring that epicone roller 5 rotates by direction shown in Figure 2 with awl roller 6 down and in 10 ° of strip plates in advance and servo-actuated die sleeve 4 operations of rolling upper and lower end face of these two workpiece of clamping, make two of machine for rolling ring to embrace the outer peripheral face that rollers 3 help 10 ° of preparatory strip plates; Core roller 2 radially towards home roll 1 direction do feed motion and with home roll 1 with 10 ° of the preparatory strip plates of roll-force roll off under the support of servo-actuated die sleeve 4 of 220KN～4200KN, 10 ° of strip plates are with the speed of 5mm/s～8mm/s broadening radially in advance, its wall thickness reduces gradually.
Strip plate is produced the continuous local plastic distortion by roll off for 10 ° under the support of servo-actuated die sleeve 4 in advance; After its deflection reaches 25%～45%, being rolled is shaped is thin-walled ring 10 (as shown in Figure 3); Close machine for rolling ring; The machine for rolling ring cantilever of removing home roll 1, epicone roller 5 after all rotatable parts stop and boring roller 6, two armfuls of rollers 3 down and be pressed in core roller 2 tops takes out thin-walled ring 10 from core roller 2 tops.
Thin-walled ring 10 is carried out solid solution+Ageing Treatment after the finish to gauge, and solution treatment is to be heated to 1080 ℃ to thin-walled ring 10, insulation 8h, air cooling; Ageing Treatment is to be cooled to 775 ℃ to the thin-walled ring 10 of solution treatment, insulation 16h, air cooling.
In above-mentioned steps 1 and step 3, the finish-forging of this alloy or finishing temperature are not less than 950 ℃.
The computational methods of said deflection are: deflection=[(in advance 10 ° of the strip plates longitudinal section area along the longitudinal section area-thin-walled ring 10 of center line along center line)/in advance 10 ° of longitudinal section areas along center line of strip plate] * 100%.
In the rolling process, can in this die sleeve, fully be out of shape shaping for 10 ° for guaranteeing servo-actuated die sleeve 4 indeformable and preparatory strip plate in the operation of rolling, the minimum wall thickness (MINI W.) of this die sleeve carries out designing and calculating by following formula:
D
0＝L-D
1-R
1-R
2
In the formula: D
0Minimum wall thickness (MINI W.) for servo-actuated die sleeve 4;
L is the minimum centers-distance of home roll 1 and core roller 2;
D
1Radially minimum wall thickness (MINI W.) for thin-walled ring 10;
R
1Radius for home roll 1;
R
2Radius for core roller 2.
Adopt this rolling alloy thin-wall ring 10 of above-mentioned roll off method, its minimum wall thickness (MINI W.) can reach 25mm, and high thick (referring to wall thickness) can reach 25 than maximum.
Through detecting, adopt the GH4033 high temperature alloy thin-walled ring 10 of said method rolling and shaping to have high dimension precision and good interior tissue and performance, satisfied the design instructions for use of this alloy rings fully.
Claims (3)
1. the method for rolling and shaping of a GH4033 high temperature alloy thin-walled ring is characterized in that, may further comprise the steps:
The deformation temperature of heating GH4033 high temperature alloy preparatory strip plate to 1110 ℃～1130 ℃, the temperature of and preheating servo-actuated die sleeve to 280 ℃～330 ℃;
Put into machine for rolling ring to said preparatory strip plate and servo-actuated die sleeve; Make preparatory strip plate entangle that servo-actuated die sleeve, servo-actuated die sleeve entangle the core roller and along between the outer peripheral face of the preparatory strip plate of centre-to-centre spacing direction of home roll and core roller and home roll, distinguish tangent the contact between the outer peripheral face of inner ring surface and the servo-actuated die sleeve of strip plate and between the outer peripheral face of the inner ring surface of servo-actuated die sleeve and core roller in advance; Strip plate is embraced roller in its outer peripheral face support by two in advance, epicone roller and the upper and lower end face clamping servo-actuated die sleeve and preparatory strip plate of following awl roller along servo-actuated die sleeve and preparatory strip plate;
Starting machine for rolling ring makes its home roll rotation and drives preparatory strip plate, servo-actuated die sleeve, core roller and two armfuls of rollers rotations; Grasping the servo-actuated die sleeve by machine for rolling ring driving epicone roller and following awl roller simultaneously rotates with preparatory strip plate together; The core roller is radially done feed motion and with roll-force under the support of servo-actuated die sleeve the roll off preparatory strip plate of home roll with 220KN～4200KN towards the home roll direction; In advance strip plate is with the speed of 5mm/s～8mm/s broadening radially; Wall thickness reduces gradually, and its deflection reaches 25%～45% back and become the thin-walled ring by roll off.
2. method for rolling and shaping according to claim 1 is characterized in that: the minimum wall thickness (MINI W.) of said servo-actuated die sleeve carries out designing and calculating by following formula:
D
0＝L-D
1-R
1-R
2
In the formula: D
0Minimum wall thickness (MINI W.) for the servo-actuated die sleeve;
L is the minimum centers-distance of home roll and core roller;
D
1Radially minimum wall thickness (MINI W.) for the thin-walled ring;
R
1Radius for home roll;
R
2Radius for the core roller.
3. method for rolling and shaping according to claim 1 is characterized in that: the wall thickness minimum of a value of said thin-walled ring is 25mm, and the maximum of ratio of height to thickness is 25.
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|---|---|---|---|
| CN2010105821942A CN102085556B (en) | 2010-12-10 | 2010-12-10 | Roll forming method of GH4033 high-temperature alloy thin-wall ring piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105821942A CN102085556B (en) | 2010-12-10 | 2010-12-10 | Roll forming method of GH4033 high-temperature alloy thin-wall ring piece |
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| CN102085556B true CN102085556B (en) | 2012-08-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108907044A (en) * | 2018-07-27 | 2018-11-30 | 贵州航天新力铸锻有限责任公司 | The i shaped steel molding die of nuclear fusion stack magnet support |
| CN109530607A (en) * | 2018-12-28 | 2019-03-29 | 贵州航宇科技发展股份有限公司 | A kind of 718plus forging special-shape ring manufacturing process |
| CN111215567A (en) * | 2019-12-06 | 2020-06-02 | 陕西宏远航空锻造有限责任公司 | Forging method for improving grain size of GH4099 high-temperature alloy thin-wall ring |
| CN111036808B (en) * | 2019-12-31 | 2021-06-15 | 王飞 | Processing method of Ti1023 alloy special-shaped ring piece |
| CN112024795A (en) * | 2020-09-25 | 2020-12-04 | 洛阳Lyc轴承有限公司 | Profiling grinding and expanding method and device for inner diameter of large annular forging |
| CN113680933A (en) * | 2021-08-27 | 2021-11-23 | 中国兵器工业第五九研究所 | Forming method of thin-wall magnesium alloy ring piece |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1292216A (en) * | 1970-01-21 | 1972-10-11 | Franz Donatu Timmermans | A method of rolling a cylinder |
| CN101284296A (en) * | 2008-04-23 | 2008-10-15 | 贵州航宇科技发展有限公司 | Rolling and shaping method of titanium alloy taper ring forged piece |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4826665A (en) * | 1971-08-12 | 1973-04-07 |
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2010
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1292216A (en) * | 1970-01-21 | 1972-10-11 | Franz Donatu Timmermans | A method of rolling a cylinder |
| CN101284296A (en) * | 2008-04-23 | 2008-10-15 | 贵州航宇科技发展有限公司 | Rolling and shaping method of titanium alloy taper ring forged piece |
Non-Patent Citations (1)
| Title |
|---|
| JP特开昭48-26665A 1973.04.07 |
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Inventor after: Wu Yongan Inventor after: Lu Manyu Inventor after: Liu Chaohui Inventor after: Huang Pan Inventor after: Yang Lianghui Inventor before: Wu Yongan Inventor before: Zhang Hua Inventor before: Lu Manyu Inventor before: Liu Chaohui Inventor before: Huang Pan Inventor before: Yang Lianghui |
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Denomination of invention: Roll forming method of GH4033 high-temperature alloy thin-wall ring piece Effective date of registration: 20140516 Granted publication date: 20120815 Pledgee: Bank of Guiyang Limited by Share Ltd. high tech branch Pledgor: Guizhou Aviation Technical Development Co.,Ltd. Registration number: 2014990000363 |
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Date of cancellation: 20170725 Granted publication date: 20120815 Pledgee: Bank of Guiyang Limited by Share Ltd. high tech branch Pledgor: Guizhou Aviation Technical Development Co.,Ltd. Registration number: 2014990000363 |
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Denomination of invention: Roll forming method of GH4033 high-temperature alloy thin-wall ring piece Effective date of registration: 20170725 Granted publication date: 20120815 Pledgee: Bank of Guiyang Limited by Share Ltd. high tech branch Pledgor: Guizhou Aviation Technical Development Co.,Ltd. Registration number: 2017990000680 |
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Date of cancellation: 20200924 Granted publication date: 20120815 Pledgee: Bank of Guiyang Limited by Share Ltd. high tech branch Pledgor: Guizhou Aviation Technical Development Co.,Ltd. Registration number: 2017990000680 |
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Denomination of invention: Rolling forming method of GH4033 superalloy thin wall ring Effective date of registration: 20200930 Granted publication date: 20120815 Pledgee: Guanshanhu sub branch of Guiyang Bank Co.,Ltd. Pledgor: Guizhou Aviation Technical Development Co.,Ltd. Registration number: Y2020520000017 |
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Date of cancellation: 20230322 Granted publication date: 20120815 Pledgee: Guanshanhu sub branch of Guiyang Bank Co.,Ltd. Pledgor: Guizhou Aviation Technical Development Co.,Ltd. Registration number: Y2020520000017 |