CN102125973B - Rolling and molding method for stainless steel high-cylinder ring forging - Google Patents
Rolling and molding method for stainless steel high-cylinder ring forging Download PDFInfo
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Abstract
The invention discloses a rolling and molding method for a stainless steel high-cylinder ring forging, which is used for rolling and molding a high-cylinder ring forging with a thin wall and favorable structure and property. In a technical scheme, the rolling and molding method comprises the following steps of: firstly, sleeving a pre-heated follow-up mould sleeve and a stainless steel pre-rolled blank heated up to a deformation centigrade into a ring rolling mill, and positioning the follow-up mould sleeve and the pre-rolled blank by a main roller, a core roller, a holding roller, an upper cone roller and a lower cone roller of the ring rolling mill; secondly, starting the ring rolling mill, feeding the core roller in the radical direction towards the main roller, rolling the pre-rolled blank in the follow-up mould sleeve by the core roller as well as the main roller with a rolling force of 150-3000 KN, widening the pre-rolled blank in the radial direction at a speed of 6 mm/s to 13 mm/s, gradually thinning the wall, and rolling the pre-rolled blank into the high-cylinder ring forging after the deformation quantity is up to 40-60%; during rolling, the upper cone roller, the lower cone roller and two holding rollers are not moved outwards along with the radial widening of the pre-rolled blank. The minimum value of the wall thickness of the stainless steel high-cylinder ring forging rolled and molded by means of the method is 20 mm, and the maximum value of height-to-thickness ratio is 20; the forging is mainly applied to cylindrical shells and other rotary parts in the fields such as aviation and 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 stainless steel ring rolling spare.
Background technology
The revolving body parts that use in the fields such as Aero-Space of adopting stainless steel 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 101279343A disclosed a kind of method for rolling and shaping of stainless steel special-shaped ring forging; This method by the stainless steel bar of specification blanking through jumping-up, punching, roll ring base (not using the roll off mould); Put into rolling and shaping in the machine for rolling ring roll off mould to blank again; Through at the deflection that rolls ring base process and precise control in each processing step, tissue and well behaved forging special-shape ring have been rolled out.When adopting high ring rolling spare of the thin stainless steel 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 stainless tissue 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 stainless steel 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.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 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 stainless steel 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 stainless steel according to the invention ring rolling spare, its technical scheme may further comprise the steps:
The temperature of preheating servo-actuated die sleeve to 240 ℃～290 ℃, the deformation temperature of and the preparatory strip plate to 1140 of heating stainless steel ℃～1180 ℃;
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 150KN～3000KN towards the home roll direction; In advance strip plate is with the speed of 6mm/s～13mm/s broadening radially; Wall thickness reduces gradually, and its deflection reaches 40%～60% 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 20mm, 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 stainless steel 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 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 stainless steel that with the trade mark is 1Cr11Ni2W2MoV is an example:
Through detecting the dimensional accuracy of the high tube of this stainless steel 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 stainless steel ring rolling spare; Its tensile strength is 1050MPa～1060MPa (greater than the 1026MPa of design instructions for use); Percentage elongation is that 0.2% o'clock yield strength is 950MPa～960MPa (greater than the 841MPa of design instructions for use); Elongation after fracture be 17%～18% (greater than the design instructions for use 9%); The contraction percentage of area be 71%～73% (greater than the design instructions for use 40%), Brinell hardness is that 321HB～325HB (satisfies the 311HB of design instructions for use～388HB).
Through detecting the impact property of the high tube of this stainless steel ring rolling spare, its ballistic work is 81J～87J (greater than the 41J of instructions for use).
Carry out carrying out flaw detection through the metallographic structure of the high tube of this stainless steel of detection ring rolling spare and to forging, reached the requirement of " the steel forgings standard is used in aviation " (GJB 5040) aviation industry 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 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 stainless steel 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 1Cr11Ni2W2MoV stainless steel is the specific embodiment that example specifies this method with China's material trademark below:
This stainless main chemical elements content (percentage by weight) is: C content 0.10%～0.16%, contain Cr amount 10.50%～12.00%, ni content 1.40%～1.80%, contain W amount 1.50%～2.00%, contain Mo amount 0.35%～0.50%, V content 0.18%～0.30%, contain Mn amount≤0.60%, si content≤0.60%, contain S amount≤0.025%, P content≤0.030%, surplus is Fe.
This stainless steel is following to the processing step of producing qualified high tube ring rolling spare from bar:
Step 1: base.
By the 1Cr11Ni2W2MoV stainless steel bar of specification blanking through heating, jumping-up, punching, 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 240 ℃～290 ℃ 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 1140 ℃～1180 ℃ 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 150KN～3000KN; In advance 10 ° of strip plates are with the speed of 6mm/s～13mm/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 40%～60%, 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 preliminary treatment after 10 finish to gauges of high tube ring rolling spare and handle with final, preliminary treatment comprises normalizing+tempering, and final the processing comprises quenching+tempering.Preliminary treatment, normalizing: promptly be heated to forging about 1000 ℃, press wall thickness insulation back air cooling; Tempering: promptly be heated to forging about 740 ℃, press wall thickness insulation back air cooling.The final processing quenched: promptly be heated to forging about 1100 ℃, press wall thickness insulation back air cooling; Tempering: promptly be heated to forging about 570 ℃, press wall thickness insulation back air cooling.
In above-mentioned steps 1 and step 3, this stainless finish-forging or finishing temperature are not less than 850 ℃.
The computational methods of said deflection are: deflection=[(in advance 10 ° of the strip plates longitudinal section area along the longitudinal section area one high ring rolling spare 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 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 stainless steel ring rolling spare 10 of above-mentioned roll off method, its minimum wall thickness (MINI W.) can reach 20mm, and high thick (referring to wall thickness) can reach 25 than maximum.
After testing, adopt the high tube of the 1Cr11Ni2W2MoV stainless steel 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 stainless steel forgings fully.
Fig. 4 shows the high tube of the stainless steel 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 stainless steel 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 stainless steel 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 stainless steel ring rolling spare is characterized in that, may further comprise the steps:
The temperature of preheating servo-actuated die sleeve to 240 ℃～290 ℃, the deformation temperature of and the preparatory strip plate to 1140 of heating stainless steel ℃～1180 ℃;
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 centre-to-centre spacing direction along home roll and core roller; Between the outer peripheral face of servo-actuated die sleeve and home roll, between the outer peripheral face of the inner ring surface of servo-actuated die sleeve and strip plate in advance and in advance distinguish tangent the contact between the outer peripheral face of the inner ring surface of 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 150KN～3000KN towards the home roll direction; In advance strip plate is with the speed of 6mm/s～13mm/s broadening radially; Wall thickness reduces gradually, and its deflection reaches 40%～60% 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 20mm, and the maximum of ratio of height to thickness is 25.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105820278A CN102125973B (en) | 2010-12-10 | 2010-12-10 | Rolling and molding method for stainless steel high-cylinder ring forging |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105820278A CN102125973B (en) | 2010-12-10 | 2010-12-10 | Rolling and molding method for stainless steel high-cylinder ring forging |
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| CN102125973A CN102125973A (en) | 2011-07-20 |
| CN102125973B true CN102125973B (en) | 2012-11-07 |
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| CN102744341B (en) * | 2012-07-03 | 2014-04-16 | 西安石油大学 | Method for designing feeding speed of cold rolling for profiled ring piece |
| CN103028682B (en) * | 2012-11-29 | 2015-02-04 | 一重集团大连设计研究院有限公司 | Anti-deflection process method for rolling shell ring |
| CN103042142B (en) * | 2013-01-15 | 2015-12-23 | 武汉理工大学 | A kind of precision rolling manufacturing process of bimetallic ring |
| CN103111564B (en) * | 2013-02-06 | 2015-12-02 | 武汉理工大学 | A kind of precision rolling manufacturing process of bimetallic cylindrical member |
| CN113020505B (en) * | 2021-03-08 | 2022-07-15 | 武汉理工大学 | Near-net composite rolling method capable of controlling circumferential-axial performance of thin-wall high-thickness rib conical cylinder |
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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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 |
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