CN102029340B - Rolling forming method for 5CrNiMo steel thin-wall ring - Google Patents
Rolling forming method for 5CrNiMo steel thin-wall ring Download PDFInfo
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- CN102029340B CN102029340B CN201010582162A CN201010582162A CN102029340B CN 102029340 B CN102029340 B CN 102029340B CN 201010582162 A CN201010582162 A CN 201010582162A CN 201010582162 A CN201010582162 A CN 201010582162A CN 102029340 B CN102029340 B CN 102029340B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 63
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 31
- 239000010959 steel Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000002093 peripheral effect Effects 0.000 claims description 16
- 238000007493 shaping process Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000005242 forging Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 208000004350 Strabismus Diseases 0.000 description 1
- 229910000754 Wrought iron Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 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
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Abstract
The invention discloses a rolling forming method for a 5CrNiMo steel thin-wall ring, which is used for rolling and forming a thin-wall ring with high dimensional precision and good texture and properties. In the technical scheme of the method, a 5CrNiMo steel pre-rolled compact heated to a deformation temperature and a preheated following-up die sleeve are firstly sleeved into a ring rolling mill, the following-up die sleeve is sleeved into the pre-rolled compact, and the follow-up die sleeve and pre-rolled compact are positioned through a main roller, a core roller, a holding roller, an upper cone roller and a lower cone roller of the ring rolling mill; the ring rolling mill is started again, the core roller of the ring rolling mill does a feed motion toward the direction of the main roller along a radial direction, and the core roller and the main roller roll the pre-rolled compact with rolling force of 180KN-3800KN under the support of the following-up die sleeve together so that the pre-rolled compact is broadened along the radial direction at the speed of 6mm/s-12mm/s, and the wall thickness of the pre-rolled compact is gradually decreased; and the pre-rolled compact is rolled into a thin-wall ring after the deformation reaches 30%-50%. The minimum of the wall thickness of the 5CrNiMo steel thin-wall ring rolled and formed by adopting the method is 25mm, and the maximum of the depth to thickness ratio is 25. The ring is mainly used for rotor parts used in the field of special vehicles, 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 5CrNiMo steel thin-walled ring.
Background technology
The 5CrNiMo steel is the hot die steel of using always; This steel thin-walled ring that adopts rolling mill practice to be shaped requires to have higher intensity, toughness and wearability; When being heated to 500 ℃, still can keep higher hardness, be mainly used in the revolving body parts that use in field such as special vehicle.When rolling, because the ring deflection is less, 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 101279343A disclosed a kind of method for rolling and shaping of stainless steel 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); Put into rolling and shaping in the machine for rolling ring roll off mould to blank again; Through in rolling ring base process and the deflection of precise control in each processing step, tissue and well behaved forging special-shape ring have been rolled out.When adopting the thin 5CrNiMo steel 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 the tissue and the performance that cause preparatory strip plate temperature to raise to steel easily exert an influence, like defectives such as tissue occurring and make a variation, crystal grain is thick.
When the 5CrNiMo steel 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 can cause certain loss concerning the not low 5CrNiMo steel of price.
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 5CrNiMo steel 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 5CrNiMo steel thin-walled ring according to the invention, its technical scheme may further comprise the steps:
The deformation temperature of heating 5CrNiMo steel preparatory strip plate to 1000 ℃～1150 ℃, the temperature of and preheating servo-actuated die sleeve to 230 ℃～280 ℃;
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 180KN～3800KN towards the home roll direction; In advance strip plate is with the speed of 6mm/s～12mm/s broadening radially; Wall thickness reduces gradually, and its deflection reaches 30%～50% 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 5CrNiMo steel 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 steel.
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 steel thin-walled ring, 3 ‰ (3/1000ths) of corresponding size have been reached.
Through detecting the room temperature tensile performance of this steel thin-walled ring; Its tensile strength is 820～840MPa (actual measurement); Percentage elongation is that 0.2% o'clock yield strength is 610～635MPa (actual measurement); Elongation after fracture is 20～21.5% (actual measurements), and the contraction percentage of area is 60～61.5% (actual measurements), and ballistic work is 72～68J (actual measurement).
The low power of this steel thin-walled ring of warp detection and high power metallographic structure, fracture, non-metallic inclusion etc. have reached the requirement of " vehicle is with hot rolling annular element standard " (GJB 2721) 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 5CrNiMo steel.
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 5CrNiMo steel 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 steel is: C content 0.50%～0.60%, si content≤0.40%, contain Mn amount 0.50%～0.80%, P content≤0.030%, contain S amount≤0.030%, containing Cr amount 0.50%～0.80%, ni content 1.40%～1.80%, surplus is Fe.
This steel is following to the processing step of producing qualified thin-walled ring from bar:
Step 1: base.
By the 5CrNiMo rod iron material 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 1000 ℃～1150 ℃ 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 230 ℃～280 ℃, 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 180KN～3800KN; In advance 10 ° of strip plates are with the speed of 6mm/s～12mm/s broadening radially, and 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 30%～50%, 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 normalizing+temper after the finish to gauge, promptly is heated to 860 ℃ to thin-walled ring 10, insulation, air cooling+690 ℃, insulation, air cooling.
In above-mentioned steps 1 and step 3, the finish-forging of this steel or finishing temperature are not less than 800 ℃.
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 steel thin-walled 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 5CrNiMo steel 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 steel loop spare fully.
Claims (3)
1. the method for rolling and shaping of a 5CrNiMo steel thin-walled ring is characterized in that, may further comprise the steps:
The deformation temperature of heating 5CrNiMo steel preparatory strip plate to 1000 ℃～1150 ℃, the temperature of and preheating servo-actuated die sleeve to 230 ℃～280 ℃;
Put into machine for rolling ring to said preparatory strip plate and servo-actuated die sleeve; Make preparatory strip plate entangle the servo-actuated die sleeve, the servo-actuated die sleeve entangles the core roller; And centre-to-centre spacing direction along home roll and core roller; In advance between the outer peripheral face of strip plate and home roll, distinguish tangent the contact between the outer peripheral face of the inner ring surface of strip plate and servo-actuated die sleeve 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 180KN～3800KN towards the home roll direction; In advance strip plate is with the speed of 6mm/s～12mm/s broadening radially; Wall thickness reduces gradually, and its deflection reaches 30%～50% 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010582162A CN102029340B (en) | 2010-12-10 | 2010-12-10 | Rolling forming method for 5CrNiMo steel thin-wall ring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010582162A CN102029340B (en) | 2010-12-10 | 2010-12-10 | Rolling forming method for 5CrNiMo steel thin-wall ring |
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| Publication Number | Publication Date |
|---|---|
| CN102029340A CN102029340A (en) | 2011-04-27 |
| CN102029340B true CN102029340B (en) | 2012-09-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103658168A (en) * | 2013-12-16 | 2014-03-26 | 贵州安大航空锻造有限责任公司 | Method for rolling rectangular die block steel ring blank into abnormal-shaped thin-wall ring member |
| CN105728605B (en) * | 2016-04-29 | 2017-03-22 | 武汉理工大学 | Aluminum alloy cone drum ring piece radial hot rolling forming method |
| CN113770661A (en) * | 2021-09-30 | 2021-12-10 | 贵阳安大宇航材料工程有限公司 | Preparation process of high-cylinder thin-wall 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 |
-
2010
- 2010-12-10 CN CN201010582162A patent/CN102029340B/en active Active
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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