CN105499449B - The method for eliminating casting and rolling composite forming large ring metallurgical imperfection - Google Patents
The method for eliminating casting and rolling composite forming large ring metallurgical imperfection Download PDFInfo
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- CN105499449B CN105499449B CN201511002466.6A CN201511002466A CN105499449B CN 105499449 B CN105499449 B CN 105499449B CN 201511002466 A CN201511002466 A CN 201511002466A CN 105499449 B CN105499449 B CN 105499449B
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- ring
- rolling
- billet
- ring billet
- roller
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Metal Rolling (AREA)
Abstract
A kind of method for eliminating casting and rolling composite forming large ring metallurgical imperfection, belongs to large ring class production technical field, it is characterised in that comprise the following steps that：Step one：Directly heat the hot ring billet by centrifugal casting depanning；Step 2：The hot ring billet of Non-traditional Techniques rolling：（1）Radial rolling,（2）Differential temperature rolling is axially repeatedly circulated in unconventional footpath,（3）Shaping,（4）Full circle.The method have the advantages that by improving the mode of heating of ring billet and improving the stress of ring billet rolling, the purpose for eliminating casting and rolling composite forming large ring metallurgical imperfection is reached, efficiently solves and produces the problem of large ring has face crack, subregion mechanical property is not up to standard, percent defective is high using casting forging integral process.Its cost of large ring of the inventive method production is than original reduction by 10%, and product qualification rate brings up to more than 90%, has the advantages that low-cost and high-performance is efficiently produced.
Description
Technical field
The invention belongs to large ring class production technical field, and in particular to one kind eliminates casting and rolling composite forming large ring
The method of metallurgical imperfection.
Background technology
Ring-shaped work pieces is industrial foundation part, in electric power, metallurgy, petrochemical industry, ship, railway, mine, Aero-Space, national defence
In terms of be widely used.In recent years, as continuing to develop for integrated technique is forged in casting, it is cast as parison duplex forging work again
The method that skill is directly processed into part turns into study hotspot.Large ring casting forging integral manufacturing technique flow newly developed at present
For：Centrifugal casting ring billet → cold base heating → routine rolling (patent No. ZL201010132491.7《One kind using strand rolling into
The method of shape large ring》).Although casting and rolling composite forming technology and traditional single process technology (smelt steel ingot → cogging → under
Material → heating → jumping-up → pulling → punching → heating → rolling) compare with flow is short, energy consumption is small, cost is low and productivity ratio is high
The advantages of, but this technology use cold base heating+routine rolling technique productions large ring when, there are some shortcomings.First, from
The heart casts the ring billet after depanning in cooling procedure because the larger temperature difference of ectonexine easily produces longitudinal crack on surface, if
These crackles cannot effectively heal and will be extended in subsequent rolling technique during cold base heating before rolling, so as to be retained in into
Shape ring surface；Furthermore, the metallurgical quality and coagulating property of steel can make inevitably to exist inside ring billet be mingled with, it is loose,
The genetic defects such as segregation, crackle, when rolling over ring using routine techniques, most of rolling power is difficult to infiltrate through casting ring billet center portion completely,
Causing the genetic defects of center portion cannot fully eliminate, so that heredity is in ring organization internal.Therefore, by cold base heating+routine
The Big Steel Castings rolling ring of rolling production has face crack, and intuitively visible, subregion mechanical property is not up to standard, and percent defective is high
Serious problems.
The content of the invention
, can be effectively it is an object of the invention to provide a kind of method for eliminating casting and rolling composite forming large ring metallurgical imperfection
Solve shortcoming present in prior art.
The present invention, which is achieved in that, is characterized in that processing step is：
Step one：Directly heat the hot ring billet by centrifugal casting depanning：
The ring billet that centrifugal casting mold clearing temperature is 650~1100 DEG C is directly placed into heating furnace and is heated to 1200~1300
DEG C, 1150~1250 DEG C are down to after ring ring internal and external temperature is consistent, then by its temperature, and be incubated 5min；
Step 2：The hot ring billet of Non-traditional Techniques rolling：
Rolling is carried out in ring footpath-axial NC Ring Rolling Machine that ring billet after above-mentioned insulation is put into shown in Fig. 1 with suspender,
Rolling technique is；
(1) radial rolling：It is zero carry out rolling according to the 2~3mm/s of radial feed of core roller 4, the axial feed of cone roller 5, makes ring
Base outside dimension rises to the 10%~20% of finished product ring outside dimension deformation total amount；
(2) differential temperature rolling is repeatedly circulated in unconventional footpath-axial direction：According to the 3~4mm/s of radial feed of core roller 4, cone roller 5 axially
Feed 1.0~2.5mm/s and carry out rolling, ring billet is highly reached finished product ring height, the outside dimension of ring billet rises to finished product
Ring outside dimension deformation total amount 60%~80%, rolling simultaneously with 10~20 DEG C of water temperature, 8~10MPa of hydraulic pressure, flow 40~
60m3/ h water under high pressure impacts to ring billet and core roller and up and down at the contact surface of cone roller；
(3) shape：It is zero carry out rolling according to the 2~3mm/s of radial feed of core roller 4, the axial feed of cone roller 5, makes ring billet
Outside dimension rises to the 90%~95% of finished product ring outside dimension deformation total amount；
(4) full circle：It is zero carry out rolling according to the 0.5~1mm/s of radial feed of core roller 4, the axial feed of cone roller 5, ring billet reaches
To desired finished product ring size.
Advantages of the present invention and good effect are：By improving the mode of heating of ring billet and improving the stress shape of ring billet rolling
State, reaches the purpose for eliminating casting and rolling composite forming ring metallurgical imperfection, efficiently solves big using casting forging integral process production
The problem of there is face crack in type ring, subregion mechanical property is not up to standard, percent defective is high.It is large-scale that the inventive method is produced
Its cost of ring is than original reduction by 10%, and product qualification rate brings up to more than 90%, is efficiently produced with low-cost and high-performance
Advantage.
Brief description of the drawings
Fig. 1 is ring footpath-axial direction rolling schematic diagram.
In figure：1- driven roller 2- ring billet 3- guide roller 4- core roller 5- cone rollers
Embodiment
Embodiment one：
Material Q345B as shown in Figure 1 ring billet, its external diameter 740mm, internal diameter 380mm, height 185mm pass through D53K-
4000 ring footpaths-axial NC ring rolling machine application present invention process manufacturing process, production external diameter 1550mm, internal diameter 1306mm, height
Spend 105mm flange ring.Its processing step is：
Step one：The ring billet that centrifugal casting mold clearing temperature is 680 DEG C is directly placed into heating furnace and is heated to 1300 DEG C, is treated
After ring billet internal and external temperature is consistent, then its temperature is down to 1250 DEG C, and is incubated 5min；
Step 2：Ring billet after above-mentioned insulation is put into D53K-4000 rings footpath-axial NC Ring Rolling Machine and rolled over
Expand, rolling technique is as follows：
(1) according to the radial feed 2.5mm/s of core roller 4, the axial feed zero of cone roller 5, rolling 40s, the ring billet size after rolling is made to be
External diameter 860mm, internal diameter 580mm, height 185mm；
(2) according to the radial feed 3.5mm/s of core roller 4, the axial feed 1.6mm/s of cone roller 5, rolling 50s, rolling uses water simultaneously
10~20 DEG C of temperature, hydraulic pressure 9MPa, flow 50m3/ h water under high pressure impacts to ring billet and core roller and up and down at the contact surface of cone roller, makes
Ring billet size is external diameter 1255mm, internal diameter 930mm, height 105mm after rolling；
(3) according to the radial feed 3mm/s of core roller 4, the axial feed zero of cone roller 5, rolling 50s, it is outer to make ring billet size after rolling
Footpath 1471mm, internal diameter 1230mm, height 105mm；
(4) according to the radial feed 1mm/s of core roller 4, the axial feed zero of cone roller 5, rolling 38s, ring billet after rolling is made to reach finished product
Ring size.
Embodiment two：
Material 42CrMo as shown in Figure 1 ring billet, its external diameter 838mm, internal diameter 500mm, height 242mm pass through D53K-
4000 ring footpaths-axial NC ring rolling machine application present invention process manufacturing process, production external diameter 1362mm, internal diameter 1174mm, height
Spend 230mm bearing ring ring.Its processing step is：
Step one：The ring billet that centrifugal casting mold clearing temperature is 1050 DEG C is directly placed into heating furnace and is heated to 1200 DEG C,
1150 DEG C are down to after ring billet internal and external temperature is consistent, then by its temperature, and is incubated 5min；
Step 2：Ring billet after above-mentioned insulation is put into D53K-4000 rings footpath-axial NC Ring Rolling Machine and rolled over
Expand, rolling technique is as follows：
(1) according to the radial feed 2mm/s of core roller 4, the axial feed zero of cone roller 5, rolling 30s, it is outer to make ring billet size after rolling
Footpath 914.7mm, internal diameter 620mm, height 242mm；
(2) according to the radial feed 3mm/s of core roller 4, the axial feed 1.5mm/s of cone roller 5, rolling 8s, further in accordance with core roller 4 radially
4mm/s, the axial feed zero of cone roller 5, rolling 40s are fed, rolling is simultaneously with 10~20 DEG C of water temperature, hydraulic pressure 8MPa, flow 40m3/h
Water under high pressure impacted to ring billet and core roller and up and down at the contact surface of cone roller, it is external diameter 1205mm, internal diameter to make ring billet size after rolling
1044mm, height 230mm；
(3) according to the radial feed 2mm/s of core roller 4, the axial feed zero of cone roller 5, rolling 38s, it is outer to make ring billet size after rolling
Footpath 1251mm, internal diameter 1140mm, height 230mm；
(4) according to the radial feed 1mm/s of core roller 4, the axial feed zero of cone roller 5, rolling 17s, ring billet after rolling is made to reach finished product
Ring size.
The ring of above-described embodiment processing, observes the surface of finished product ring, and its face crack is significantly reduced, the ring after processing
Part surface does not find that fine crack is present yet；The mechanical property of finished product ring different parts is detected, index reaches actual use
It is required that；The microstructure of finished product ring center portion is analyzed, its dense structure's crystal grain is tiny.Present invention process method is efficiently solved should
The problem of large ring percent defective is high is produced with casting forging integral process.
Claims (1)
1. a kind of method for eliminating casting and rolling composite forming large ring metallurgical imperfection, it is characterised in that processing step is：
Step one：Directly heat the hot ring billet by centrifugal casting depanning：
The ring billet that centrifugal casting mold clearing temperature is 650~1100 DEG C is directly placed into heating furnace and is heated to 1200~1300 DEG C,
1150~1250 DEG C are down to after ring billet internal and external temperature is consistent, then by its temperature, and is incubated 5min；
Step 2：The hot ring billet of Non-traditional Techniques rolling：
Ring billet after above-mentioned insulation is put into ring footpath-axial NC Ring Rolling Machine with suspender and carries out rolling, rolling technique is：
（1）Radial rolling：According to core roller（4）2 ~ 3mm/s of radial feed, cone roller（5）Axial feed is zero carry out rolling, makes ring billet
Outside dimension rises to the 10% ~ 20% of finished product ring outside dimension deformation total amount；
（2）Repeatedly circulate differential temperature rolling in unconventional footpath-axial direction：According to core roller（4）3 ~ 4mm/s of radial feed, cone roller（5）Axially enter
Rolling is carried out to 1.0 ~ 2.5mm/s, ring billet is highly reached finished product ring height, the outside dimension of ring billet rises to finished product ring
The 60% ~ 80% of outside dimension deformation total amount, rolling is simultaneously with 10 ~ 20 DEG C of water temperature, 8 ~ 10MPa of hydraulic pressure, 40 ~ 60m of flow3/ h height
Water is pressed to be impacted to ring billet and core roller and up and down at the contact surface of cone roller；
（3）Shaping：According to core roller（4）2 ~ 3mm/s of radial feed, cone roller（5）Axial feed is zero carry out rolling, makes the outer of ring billet
Footpath size rises to the 90% ~ 95% of finished product ring outside dimension deformation total amount；
（4）Full circle：According to core roller（4）0.5 ~ 1mm/s of radial feed, cone roller（5）Axial feed is zero carry out rolling, and ring billet reaches
It is required that finished product ring size.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511002466.6A CN105499449B (en) | 2015-12-28 | 2015-12-28 | The method for eliminating casting and rolling composite forming large ring metallurgical imperfection |
Applications Claiming Priority (1)
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| CN201511002466.6A CN105499449B (en) | 2015-12-28 | 2015-12-28 | The method for eliminating casting and rolling composite forming large ring metallurgical imperfection |
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| CN105499449A CN105499449A (en) | 2016-04-20 |
| CN105499449B true CN105499449B (en) | 2017-09-22 |
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| CN107081397A (en) * | 2017-05-25 | 2017-08-22 | 江苏重锻造有限公司 | A kind of nuclear safety equipment forging rolles over ring method with numerical control rolling machine |
| CN110479842B (en) * | 2019-08-02 | 2020-11-24 | 武汉理工大学 | Rolling-spinning composite forming method for large-sized thin-wall Y-shaped ring part |
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| CN101823197B (en) * | 2010-03-22 | 2012-05-23 | 太原科技大学 | Method for molding large ring piece by casting blank ring rolling |
| JP5613468B2 (en) * | 2010-06-10 | 2014-10-22 | Ｍｍｃスーパーアロイ株式会社 | Method for producing annular molded body |
| CN102489639B (en) * | 2011-12-27 | 2013-03-06 | 张家港海陆环形锻件有限公司 | Fine-grain roll-forming method for large annular piece made of high alloy steel |
| CN102689151B (en) * | 2012-06-18 | 2014-11-26 | 西南大学 | Liquid die forging and rolling compound formation method for GH4033 high-temperature alloy irregular-section large ring piece |
| CN102689163B (en) * | 2012-06-18 | 2015-07-15 | 西南大学 | Liquid die forging rolling compound forming method for large ring member with different cross sections |
| CN105170850B (en) * | 2015-09-23 | 2016-11-09 | 定州市金华蓝天汽车零部件有限公司 | A kind of centrifugal casting bi-metal double is combined ring hot rolling forming technique |
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