CN102085548B - Roll forming method of titanium alloy high cylindrical ring forging - Google Patents
Roll forming method of titanium alloy high cylindrical ring forging Download PDFInfo
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- CN102085548B CN102085548B CN2010105819548A CN201010581954A CN102085548B CN 102085548 B CN102085548 B CN 102085548B CN 2010105819548 A CN2010105819548 A CN 2010105819548A CN 201010581954 A CN201010581954 A CN 201010581954A CN 102085548 B CN102085548 B CN 102085548B
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Abstract
The invention discloses a roll forming method of a titanium alloy high cylindrical ring forging, wherein the high cylindrical ring forging is roll-formed and has a thin wall and excellent structure and performance. The technical scheme is as follows: feeding a pre-heated follow-up mould sleeve and a titanium alloy pre-rolled blank sleeve which is heated to a deforming temperature into a ring rolling mill; 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 ring rolling 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 in the follow-up mould sleeve together with the main roller with a rolling force of 200-4,000 KN so that the pre-rolled blank is widened radially at a speed of 5-10 mm/s and the wall thickness is gradually reduced; after the deformation of the pre-rolled blank reaches 25-45%, the pre-rolled blank is rolled into a high cylindrical ring forging; and during the rolling, the upper and lower conical rollers and the two holding rollers are not radially widened to move outwards with the pre-rolled blank. The minimum of the wall thickness of the titanium alloy high cylindrical ring forging roll-formed by the method is 25 mm, and the maximum of the height-thickness ratio is 25 mm; and the forging is mainly applied to 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 the high tube of titanium alloy ring rolling spare.
Background technology
The revolving body parts that use in the fields such as Aero-Space of adopting titanium alloy to make like the barrel-type casing forging etc., because the wall thickness of forging is thinner, highly higher, is added forging ' s block dimension precision, performance and tissue and are required also higherly, have increased the difficulty of roll forming.
On October 8th, 2008, disclosed Chinese invention patent specification CN 101279345A disclosed a kind of method for rolling and shaping of titanium alloy special-shaped ring forging; 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 forging special-shape ring have been rolled out double rolling in the ring base process.When adopting high ring rolling spare of the thin titanium alloy of the rolling wall thickness of this method; Because the rotation direction of home roll is inconsistent with the rotation direction of preparatory strip plate; 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 high tube of the titanium alloy ring rolling spare 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 home roll of machine for rolling ring; The rigidity of structure that adds the high tube of thin-walled ring rolling spare 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 ring rolling spare shape and size not reach that design is used or machined requirement and scrapping, this loses bigger concerning expensive titanium alloy material.And, because upper and lower awl roller and two embrace rollers and will move with the radially broadening of preparatory strip plate when rolling, increased the difficulty of equipment operation and control outward.
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 rolling spare is scrapped by draw down easily.And because armful roller size of machine for rolling ring is certain; It does not highly generally have the height of high tube ring rolling spare high; Therefore the reaction force that receives to embrace roller in the operation of rolling is prone to owing to embrace roller " assist and roll " at the outer peripheral face of ring rolling spare and forms the step vestige, and the shape and the dimensional accuracy of ring rolling spare caused harmful effect.
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 the high tube of titanium alloy ring rolling spare, the high tube ring rolling spare that adopts this method can roll out thin-walled and have good tissue and performance.
For solving the problems of the technologies described above, the method for rolling and shaping of the high tube of titanium alloy according to the invention ring rolling spare, its technical scheme may further comprise the steps:
The temperature of preheating servo-actuated die sleeve to 250 ℃～300 ℃, and the preparatory strip plate of heating titanium alloy is to 30 ℃ deformation temperature below the transformation temperature;
Put into machine for rolling ring to said servo-actuated die sleeve and preparatory strip plate; Make that the servo-actuated die sleeve entangles preparatory strip plate, in advance strip plate entangles the core roller and along distinguishing tangent the contact between the outer peripheral face of the centre-to-centre spacing direction servo-actuated die sleeve of home roll and core roller and home roll, between the outer peripheral face of the inner ring surface of servo-actuated die sleeve and strip plate in advance and between the outer peripheral face of the inner ring surface of preparatory strip plate and core roller; The servo-actuated die sleeve is embraced roller in its outer peripheral face support by two, 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 rotates its home roll rotation and driving servo-actuated die sleeve, preparatory strip plate, core roller and two armfuls of rollers; 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 servo-actuated die sleeve in the roll off preparatory strip plate of home roll with 200KN～4000KN towards the home roll direction; In advance strip plate is with the speed of 5mm/s～10mm/s broadening radially; Wall thickness reduces gradually, and its deflection reaches 25%～45% back and become high tube ring rolling spare by roll off, and upper and lower awl roller and two armfuls of rollers do not move outward with the radially broadening of preparatory strip plate during roll off.
When adopting high ring rolling spare of said method roll off different cross section shape, the inner ring surface shape of said servo-actuated die sleeve is to adjust according to the outer peripheral face shape of high tube ring rolling spare.
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 high tube ring rolling spare;
R
1Radius for home roll;
R
2Radius for the core roller.
Adopt the high tube ring rolling spare 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 after putting into the machine for rolling ring location through the servo-actuated die sleeve of preheating with the preparatory strip plate cover of the titanium alloy that is heated to deformation temperature; Radially do feed motion and its distortion is shaped by its core roller, obtained the high tube ring rolling spare of thin-walled and tissue and function admirable with home roll preparatory strip plate of roll off in the 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.Although the rotation direction of home roll is inconsistent with the rotation direction of preparatory strip plate when rolling; But since in advance between strip plate and the home roll at a distance from one deck servo-actuated die sleeve; And strip plate therewith rotates in the servo-actuated die sleeve in the same way in advance; 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 outer peripheral face of strip plate is close on the inner ring surface of servo-actuated die sleeve and therewith in the same way, rotate synchronously; Avoided the influence of the home roll rigid element of preparatory strip plate and its switched in opposite; 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 outer peripheral face of preparatory strip plate and prevent its draw down and phenomenon such as horn mouth occurs, can realize the high ring rolling spare of precision rolling forming dimension precision, saves valuable titanium alloy material.
In the roll off process; Because strip plate is to be sleeved in the servo-actuated die sleeve in advance; Be directly to contact with two outer peripheral faces of embracing rollers by the outer peripheral face of servo-actuated die sleeve; Can the preparatory strip plate in the servo-actuated die sleeve not had much impact even therefore produce dancing yet, nor can make the outer peripheral face of ring rolling spare the step vestige occur owing to embrace " auxilliary the rolling " of roller.
In the roll off process,, control and operation easier have been reduced outward to equipment because upper and lower awl roller and two armfuls of rollers do not move with the radially broadening of preparatory strip plate.
The wrought titanium alloy that with the trade mark is TC4 is an example:
Through detecting the dimensional accuracy of the high tube of this alloy ring rolling spare, 3 ‰ (3/1000ths) of corresponding size have been reached.
Through detecting the room temperature tensile performance of the high tube of this alloy ring rolling spare; Its tensile strength is 980MPa～1000MPa (greater than the 895MPa of design instructions for use); Percentage elongation is that 0.2% o'clock yield strength is 945MPa～960MPa (greater than the 825MPa of design instructions for use); Elongation after fracture be 11.5%～13.5% (greater than the design instructions for use 10%), the contraction percentage of area be 43.5%～47.5% (greater than the design instructions for use 20%).
Through the high temperature tensile properties of the high tube of this alloy of detection ring rolling spare at 400 ℃; Its tensile strength is 635MPa～660MPa (greater than the 615MPa of design instructions for use); Elongation after fracture be 13.5%～16% (greater than the design instructions for use 12%), the contraction percentage of area be 47.5%～58.5% (greater than the design instructions for use 40%).
Through detecting the enduring quality of the high tube of this alloy ring rolling spare, this alloy forged piece is that 400 ℃, proof stress are to reach 570MPa, duration in 101 hours disconnectedly in test temperature, has satisfied the design instructions for use.
Carry out carrying out flaw detection through the metallographic structure of the high tube of this alloy of detection ring rolling spare and to forging, reached the requirement of " aircraft is used the TC4 titanium alloy forging " (HB5432) aviation industry standard.
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 preparatory strip plate.
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 high tube ring rolling spare.
Fig. 4 is along the vertical section structure state diagram of its center line when adopting the high tube of first kind of odd-shaped cross section of the method for the invention roll off ring rolling spare.
Fig. 5 is along the vertical section structure state diagram of its center line when adopting the high tube of second kind of odd-shaped cross section of the method for the invention roll off ring rolling spare.
Fig. 6 is along the vertical section structure state diagram of its center line when adopting the high tube of the third odd-shaped cross section of the method for the invention roll off ring rolling spare.
The specific embodiment
The method for rolling and shaping of the high tube of the described titanium alloy of embodiment of the present invention ring rolling spare need provide equipment such as forge furnace, forcing press, machine for rolling ring, manipulator.Be that the wrought titanium alloy of TC4 is the specific embodiment that example specifies this method with China's material trademark below:
The main chemical elements content (percentage by weight) of this alloy is: contain Al amount 5.5%～6.8%, V content 3.5%～4.5%, contain Fe amount≤0.30%, C content≤0.10%, contain N amount≤0.05%, contain H amount≤0.015%, contain O amount≤0.20%, other elements are single≤0.10% and summation≤0.40%, surplus be Ti.
This alloy is following to the processing step of producing qualified high tube ring rolling spare from bar:
Step 1: base.
By the TC4 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 preheating to servo-actuated die sleeve 4 (not shown) on the chassis of putting into machine for rolling ring after 250 ℃～300 ℃ and lying in this machine; Servo-actuated die sleeve 4 packs into the core roller 2 of machine for rolling ring; 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 4 supporting roles of 3 pairs of servo-actuated die sleeves of roller for two; 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 servo-actuated die sleeve 4 in after simultaneously in forge furnace, being heated to below the transformation temperature 30 ℃ deformation temperature to 10 ° of strip plates in advance, between the outer peripheral face of the outer peripheral face of servo-actuated die sleeve 4 and home roll 1, between the inner ring surface of the outer peripheral face of 10 ° of preparatory strip plates and servo-actuated die sleeve 4, between the outer peripheral face of the inner ring surface that reaches 10 ° of preparatory strip plates 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 servo-actuated die sleeve 4,10 ° of strip plates, core roller 2 and two armfuls of rollers 3 rotate by direction shown in Figure 2 in advance; 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 servo-actuated die sleeve 4 and 10 ° of operations of rolling of strip plate in advance the upper and lower end face of these two workpiece of clamping, make two of machine for rolling ring to embrace the outer circumference surface that rollers 3 help servo-actuated die sleeve 4; 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 in servo-actuated die sleeve 4 of 200KN～4000KN; In advance 10 ° of strip plates are with the speed of 5mm/s～10mm/s broadening radially; Its wall thickness reduces gradually, and upper and lower awl roller 5 and 6 and two armfuls of rollers 3 do not move outward with the radially broadening of 10 ° of preparatory strip plates.
Strip plate is produced the continuous local plastic distortion by roll off for 10 ° in servo-actuated die sleeve 4 in advance; After its deflection reaches 25%～45%, being rolled is shaped is high tube ring rolling spare 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 a high ring rolling spare 10 again behind core roller 2 tops taking-up servo-actuated die sleeve 4.
Carry out annealing in process after 10 finish to gauges of high tube ring rolling spare, promptly be heated to forging about 800 ℃, press wall thickness insulation back with the stove air cooling.
In above-mentioned steps 1 and step 3, the finish-forging of this alloy or finishing temperature are not less than 850 ℃; In the present embodiment, it is 980 ℃ through the transformation temperature that detects this alloy.
The computational methods of said deflection are: deflection=[(10 ° of longitudinal section areas along center line of strip plate-Gao tube ring rolling spare 10 is along the longitudinal section area of center line in advance)/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 high tube ring rolling spare 10;
R
1Radius for home roll 1;
R
2Radius for core roller 2.
Adopt the rolling high tube of this alloy ring rolling spare 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.
After testing, adopt the high tube of the TC4 titanium alloy ring rolling spare 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 forged piece fully.
Fig. 4 shows the high tube of the titanium alloy ring rolling spare 10 that adopts first kind of odd-shaped cross section of above-mentioned method for rolling and shaping roll off
1The time along the state of the vertical section structure of its center line, high tube ring rolling spare 10 among the figure
1Outer peripheral face be the bulge shape, to should high tube ring rolling spare 10
1The odd-shaped cross section shape, servo-actuated die sleeve 4
1Inner ring surface and core roller 2
1The outer peripheral face shape done corresponding adjustment.
Fig. 5 shows the high tube of the titanium alloy ring rolling spare 10 that adopts second kind of odd-shaped cross section of above-mentioned method for rolling and shaping roll off
2The time along the state of the vertical section structure of its center line, among the figure at high tube ring rolling spare 10
2Lower surface and its outer peripheral face intersection one raised ring is arranged, to should high tube ring rolling spare 10
2The odd-shaped cross section shape, servo-actuated die sleeve 4
2The inner ring surface shape done corresponding adjustment, for clarity sake, correspondence has marked core roller 2
2Reference numeral.
Fig. 6 shows the high tube of the titanium alloy ring rolling spare 10 that adopts above-mentioned the third odd-shaped cross section of method for rolling and shaping roll off
3The time along the state of the vertical section structure of its center line, among the figure at high tube ring rolling spare 10
3Lower surface and its outer peripheral face intersection one raised ring is arranged and one raised ring is also arranged in the middle and upper part of its outer peripheral face, to should high tube ring rolling spare 10
3The odd-shaped cross section shape, servo-actuated die sleeve 4
3The inner ring surface shape done corresponding adjustment, for clarity sake, and correspondence has marked core roller 2
3Reference numeral.
Adopt above-mentioned method for rolling and shaping provided by the invention to be not limited to above-mentioned embodiment; High tube ring rolling spare for the different cross section shape; Only need the corresponding shape that changes servo-actuated die sleeve and core roller, but according to the method described above just roll off go out the high ring rolling spare of different cross section shape.
Claims (4)
1. the method for rolling and shaping of the high tube of a titanium alloy ring rolling spare is characterized in that, may further comprise the steps:
The temperature of preheating servo-actuated die sleeve to 250 ℃～300 ℃, and the preparatory strip plate of heating titanium alloy is to 30 ℃ deformation temperature below the transformation temperature;
Put into machine for rolling ring to said servo-actuated die sleeve and preparatory strip plate; Make that the servo-actuated die sleeve entangles preparatory strip plate, in advance strip plate entangles the core roller and along distinguishing tangent the contact between the outer peripheral face of the centre-to-centre spacing direction servo-actuated die sleeve of home roll and core roller and home roll, between the outer peripheral face of the inner ring surface of servo-actuated die sleeve and strip plate in advance and between the outer peripheral face of the inner ring surface of preparatory strip plate and core roller; The servo-actuated die sleeve is embraced roller in its outer peripheral face support by two, 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 rotates its home roll rotation and driving servo-actuated die sleeve, preparatory strip plate, core roller and two armfuls of rollers; 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 servo-actuated die sleeve in the roll off preparatory strip plate of home roll with 200KN～4000KN towards the home roll direction; In advance strip plate is with the speed of 5mm/s～10mm/s broadening radially; Wall thickness reduces gradually, and its deflection reaches 25%～45% back and become high tube ring rolling spare by roll off, and upper and lower awl roller and two armfuls of rollers do not move outward with the radially broadening of preparatory strip plate during roll off.
2. method for rolling and shaping according to claim 1 is characterized in that: the inner ring surface shape of said servo-actuated die sleeve is to adjust according to the outer peripheral face shape of high tube ring rolling spare.
3. method for rolling and shaping according to claim 1 and 2 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 high tube ring rolling spare;
R
1Radius for home roll;
R
2Radius for the core roller.
4. method for rolling and shaping according to claim 1 is characterized in that: the wall thickness minimum of a value of said high tube ring rolling spare is 25mm, and the maximum of ratio of height to thickness is 25.
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| CN2010105819548A CN102085548B (en) | 2010-12-10 | 2010-12-10 | Roll forming method of titanium alloy high cylindrical ring forging |
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| CN102601278B (en) * | 2012-03-20 | 2014-04-02 | 武汉理工大学 | Method for radially and axially rolling and forming large-sized double-edge stepped ring parts |
| CN104148396A (en) * | 2014-06-30 | 2014-11-19 | 贵州安大航空锻造有限责任公司 | Core roller and roll forming method of large inner-step-section ring pieces |
| CN105382156A (en) * | 2015-12-02 | 2016-03-09 | 贵州安大航空锻造有限责任公司 | Isotropic rolling method for alpha-beta two-phase titanium alloy rectangular ring piece |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101410193A (en) * | 2006-03-29 | 2009-04-15 | 三菱麻铁里亚尔株式会社 | Ring rolling mill and ring rolling method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH02133131A (en) * | 1988-11-09 | 1990-05-22 | Mitsubishi Electric Corp | Electric conduction heating device for ring-like metallic member |
| JPH03169445A (en) * | 1989-11-28 | 1991-07-23 | Nippon Stainless Steel Co Ltd | Manufacture of titanium ring for electrodeposition drum |
| JPH04182005A (en) * | 1990-11-14 | 1992-06-29 | Mitsubishi Materials Corp | Method for controlling rolling of ring-like member |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101410193A (en) * | 2006-03-29 | 2009-04-15 | 三菱麻铁里亚尔株式会社 | Ring rolling mill and ring rolling method |
| 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 (4)
| Title |
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| JP平2-133131A 1990.05.22 |
| JP平3-169445A 1991.07.23 |
| JP平4-182005A 1992.06.29 |
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Application publication date: 20110608 Assignee: Guiyang Daewoo Aviation Materials Engineering Co., Ltd. Assignor: Anda Aviation Forging Co., Ltd., Guizhou Contract record no.: 2015520000025 Denomination of invention: Roll forming method of titanium alloy high cylindrical ring forging Granted publication date: 20120808 License type: Exclusive License Record date: 20150730 |
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