CN105499449A - Method for eliminating metallurgical defects of large annular parts in casting-rolling composite forming - Google Patents
Method for eliminating metallurgical defects of large annular parts in casting-rolling composite forming Download PDFInfo
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- CN105499449A CN105499449A CN201511002466.6A CN201511002466A CN105499449A CN 105499449 A CN105499449 A CN 105499449A CN 201511002466 A CN201511002466 A CN 201511002466A CN 105499449 A CN105499449 A CN 105499449A
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- rolling
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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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Abstract
The invention discloses a method for eliminating metallurgical defects of large annular parts in casting-rolling composite forming, and belongs to the technical field of production for large annular parts. The method is characterized by comprising the following process steps: step 1, directly heating hot annular blanks discharged from a mould for centrifugal casting; step 2, rolling the hot annular blanks by virtue of an unconventional technology, specifically, (1) radially rolling, (2) carrying out unconventional diameter-axial multi-cycle differential-temperature rolling, (3) forming, and (4) rounding. According to the invention, the purpose of eliminating the metallurgical defects of large annular parts in casting-rolling composite forming is achieved through improving a heating manner for the annular blanks, and improving a stress state of rolling for the annular blanks, thus the problems of surface cracks, substandard mechanical properties of partial areas, and high rejection rate, existing in application of a casting-forging integrated process for producing large annular parts, are effectively solved. The cost of the large annular parts produced by the method disclosed by the invention is reduced by 10% compared with the original cost, and the product percent of pass is increased by more than 90%; and the method has the advantage of realizing low-cost, high-performance and high-effect production.
Description
Technical field
The invention belongs to large ring class production technical field, be specifically related to a kind of method eliminating casting and rolling composite forming large ring metallurgical imperfection.
Background technology
Ring-shaped work pieces is industrial foundation part, is widely used in electric power, metallurgy, petrochemical industry, boats and ships, railway, mine, Aero-Space, national defence etc.In recent years, along with the development of casting forging integrated technique, being cast as the parison method that duplex forging technique is directly processed into part again becomes study hotspot.Large ring casting forging integral manufacturing technique flow process newly developed is at present: centrifugal casting ring base → cold base heating → conventional rolling (patent No. ZL201010132491.7 " a kind of method utilizing strand rolling forming large ring ").Although casting and rolling composite forming technology has compared with the single process technology of tradition (smelting steel ingot → cogging → blanking → heating → jumping-up → pulling → punching → heating → rolling), flow process is short, energy consumption is little, cost is low and productivity ratio advantages of higher, but when this technology adopts cold base heating+conventional rolling explained hereafter large ring, there are some shortcomings.First, ring base after centrifugal casting depanning in cooling procedure because the larger temperature difference of ectonexine very easily produces longitudinal crack on surface, will expand in rolling technique subsequently if these crackles can not get effectively healing before rolling during cold base heating, thus be retained in shaping ring surface; Moreover, the metallurgical quality of iron and steel and coagulating property can make ring base inner inevitably exist be mingled with, loosen, segregation, the genetic defects such as crackle, when adopting routine techniques to roll over ring, major part rolling power is difficult to infiltrate through casting ring base heart portion completely, cause the genetic defects in heart portion to can not get abundant elimination, thus heredity is at ring organization internal.Therefore, by cold base heat+Big Steel Castings that conventional rolling is produced roll over ring exist face crack directly perceived visible, subregion mechanical property is not up to standard, the serious problems that percent defective is high.
Summary of the invention
The object of this invention is to provide a kind of method eliminating casting and rolling composite forming large ring metallurgical imperfection, can effectively solve the shortcoming existed in prior art.
The present invention is achieved in that and it is characterized in that processing step is:
Step one: directly heating is by the hot ring base of centrifugal casting depanning:
Be that the ring base of 650 ~ 1100 DEG C is directly put into heating furnace and is heated to 1200 ~ 1300 DEG C by centrifugal casting mold clearing temperature, after ring ring internal and external temperature is consistent, then its temperature be down to 1150 ~ 1250 DEG C, and be incubated 5min;
Step 2: the hot ring base of Non-traditional Techniques rolling:
Ring base suspender after above-mentioned insulation is put into the ring footpath-axial NC Ring Rolling Machine shown in Fig. 1 and carries out rolling, rolling technique is;
(1) radial rolling: be zero carry out rolling according to core roller 4 radial feed 2 ~ 3mm/s, cone roller 5 axial feed, makes ring base outside dimension rise to 10% ~ 20% of finished product ring outside dimension distortion total amount;
(2) unconventional footpath-axis repeatedly circulation differential temperature rolling: carry out rolling according to core roller 4 radial feed 3 ~ 4mm/s, cone roller 5 axial feed 1.0 ~ 2.5mm/s, ring base height is made to reach finished product ring height, the outside dimension of ring base rises to 60% ~ 80% of finished product ring outside dimension distortion total amount, and rolling uses water temperature 10 ~ 20 DEG C, hydraulic pressure 8 ~ 10MPa, flow 40 ~ 60m simultaneously
3the water under high pressure of/h impacts to ring base and core roller and the contact surface place that bores roller up and down;
(3) be shaped: be zero carry out rolling according to core roller 4 radial feed 2 ~ 3mm/s, cone roller 5 axial feed, make the outside dimension of ring base rise to 90% ~ 95% of finished product ring outside dimension distortion total amount;
(4) full circle: be zero carry out rolling according to core roller 4 radial feed 0.5 ~ 1mm/s, cone roller 5 axial feed, ring base meets the requirements of finished product ring size.
Advantage of the present invention and good effect are: by improving the mode of heating of ring base and improving the stress of ring base rolling, reach the object eliminating casting and rolling composite forming ring metallurgical imperfection, efficiently solve application casting forging integral process and produce large ring and there is face crack, subregion mechanical property is not up to standard, percent defective is high problem.Its cost of large ring that the inventive method is produced reduces by 10% than original, and product percent of pass brings up to more than 90%, has the advantage of low-cost and high-performance High-efficient Production.
Accompanying drawing explanation
Fig. 1 is ring footpath-axial rolling schematic diagram.
In figure: 1-driven roller 2-ring base 3-guide roller 4-core roller 5-bores roller.
Detailed description of the invention
Embodiment one:
The ring base of material Q345B as shown in Figure 1, its external diameter 740mm, internal diameter 380mm, height 185mm, by D53K-4000 ring footpath-axial NC ring rolling machine application present invention process manufacturing process, produce the flange ring of external diameter 1550mm, internal diameter 1306mm, height 105mm.Its processing step is:
Step one: be that the ring base of 680 DEG C is directly put into heating furnace and is heated to 1300 DEG C by centrifugal casting mold clearing temperature, after ring base internal and external temperature is consistent, then its temperature be down to 1250 DEG C, and be incubated 5min;
Step 2: the ring base after above-mentioned insulation is put into D53K-4000 ring footpath-axial NC Ring Rolling Machine and carries out rolling, rolling technique is as follows:
(1) according to core roller 4 radial feed 2.5mm/s, cone roller 5 axial feed zero, rolling 40s, after making rolling, ring base is of a size of external diameter 860mm, internal diameter 580mm, height 185mm;
(2) according to core roller 4 radial feed 3.5mm/s, cone roller 5 axial feed 1.6mm/s, rolling 50s, rolling uses water temperature 10 ~ 20 DEG C, hydraulic pressure 9MPa, flow 50m simultaneously
3the water under high pressure of/h impacts to ring base and core roller and the contact surface place that bores roller up and down, and after making rolling, ring base is of a size of external diameter 1255mm, internal diameter 930mm, height 105mm;
(3) according to core roller 4 radial feed 3mm/s, cone roller 5 axial feed zero, rolling 50s, after making rolling, ring base is of a size of external diameter 1471mm, internal diameter 1230mm, height 105mm;
(4) according to core roller 4 radial feed 1mm/s, cone roller 5 axial feed zero, rolling 38s, after making rolling, ring base reaches finished product ring size.
Embodiment two:
The ring base of material 42CrMo as shown in Figure 1, its external diameter 838mm, internal diameter 500mm, height 242mm, by D53K-4000 ring footpath-axial NC ring rolling machine application present invention process manufacturing process, produce the bearing ring ring of external diameter 1362mm, internal diameter 1174mm, height 230mm.Its processing step is:
Step one: be that the ring base of 1050 DEG C is directly put into heating furnace and is heated to 1200 DEG C by centrifugal casting mold clearing temperature, after ring base internal and external temperature is consistent, then its temperature be down to 1150 DEG C, and be incubated 5min;
Step 2: the ring base after above-mentioned insulation is put into D53K-4000 ring footpath-axial NC Ring Rolling Machine and carries out rolling, rolling technique is as follows:
(1) according to core roller 4 radial feed 2mm/s, cone roller 5 axial feed zero, rolling 30s, after making rolling, ring base is of a size of external diameter 914.7mm, internal diameter 620mm, height 242mm;
(2) according to core roller 4 radial feed 3mm/s, cone roller 5 axial feed 1.5mm/s, rolling 8s, then according to core roller 4 radial feed 4mm/s, cone roller 5 axial feed zero, rolling 40s, rolling uses water temperature 10 ~ 20 DEG C, hydraulic pressure 8MPa, flow 40m simultaneously
3the water under high pressure of/h impacts to ring base and core roller and the contact surface place that bores roller up and down, and after making rolling, ring base is of a size of external diameter 1205mm, internal diameter 1044mm, height 230mm;
(3) according to core roller 4 radial feed 2mm/s, cone roller 5 axial feed zero, rolling 38s, after making rolling, ring base is of a size of external diameter 1251mm, internal diameter 1140mm, height 230mm;
(4) according to core roller 4 radial feed 1mm/s, cone roller 5 axial feed zero, rolling 17s, after making rolling, ring base reaches finished product ring size.
The ring of above-described embodiment processing, observe the surface of finished product ring, its face crack obviously reduces, and the ring surface after processing does not find that fine crack exists yet; Detect the mechanical property of finished product ring different parts, index all reaches actual operation requirements; Analyze the microstructure in finished product ring heart portion, its dense structure's crystal grain is tiny.Present invention process method efficiently solves application casting forging integral process and produces the high problem of large ring percent defective.
Claims (1)
1. eliminate a method for casting and rolling composite forming large ring metallurgical imperfection, it is characterized in that processing step is:
Step one: directly heating is by the hot ring base of centrifugal casting depanning:
Be that the ring base of 650 ~ 1100 DEG C is directly put into heating furnace and is heated to 1200 ~ 1300 DEG C by centrifugal casting mold clearing temperature, after ring base internal and external temperature is consistent, then its temperature be down to 1150 ~ 1250 DEG C, and be incubated 5min;
Step 2: the hot ring base of Non-traditional Techniques rolling:
Ring base suspender after above-mentioned insulation is put into ring footpath-axial NC Ring Rolling Machine and carries out rolling, rolling technique is:
(1) radial rolling: be zero carry out rolling according to core roller (4) radial feed 2 ~ 3mm/s, cone roller (5) axial feed, makes ring base outside dimension rise to 10% ~ 20% of finished product ring outside dimension distortion total amount;
(2) unconventional footpath-axis repeatedly circulation differential temperature rolling: carry out rolling according to core roller (4) radial feed 3 ~ 4mm/s, cone roller (5) axial feed 1.0 ~ 2.5mm/s, ring base height is made to reach finished product ring height, the outside dimension of ring base rises to 60% ~ 80% of finished product ring outside dimension distortion total amount, and rolling uses water temperature 10 ~ 20 DEG C, hydraulic pressure 8 ~ 10MPa, flow 40 ~ 60m simultaneously
3the water under high pressure of/h impacts to ring base and core roller and the contact surface place that bores roller up and down;
(3) be shaped: be zero carry out rolling according to core roller (4) radial feed 2 ~ 3mm/s, cone roller (5) axial feed, make the outside dimension of ring base rise to 90% ~ 95% of finished product ring outside dimension distortion total amount;
(4) full circle: be zero carry out rolling according to core roller (4) radial feed 0.5 ~ 1mm/s, cone roller (5) axial feed, ring base meets the requirements of finished product ring size.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110479842A (en) * | 2019-08-02 | 2019-11-22 | 武汉理工大学 | Large thin-wall Y shape ring rolling-spinning combined shaping method |
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|---|---|---|---|---|
| CN101823197A (en) * | 2010-03-22 | 2010-09-08 | 太原科技大学 | Method for molding large ring piece by casting blank ring rolling |
| JP2011255410A (en) * | 2010-06-10 | 2011-12-22 | Mitsubishi Materials Corp | Method for manufacturing annular compact |
| CN102489639A (en) * | 2011-12-27 | 2012-06-13 | 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 |
| CN102689163A (en) * | 2012-06-18 | 2012-09-26 | 西南大学 | Liquid die forging rolling compound forming method for large ring member with different cross sections |
| CN102689151A (en) * | 2012-06-18 | 2012-09-26 | 西南大学 | Liquid die forging and rolling compound formation method for GH4033 high-temperature alloy irregular-section large ring piece |
| CN105170850A (en) * | 2015-09-23 | 2015-12-23 | 定州市金华蓝天汽车零部件有限公司 | Centrifugal casting duplex-metal composite ring part hot extend-rolling forming technology |
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2015
- 2015-12-28 CN CN201511002466.6A patent/CN105499449B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823197A (en) * | 2010-03-22 | 2010-09-08 | 太原科技大学 | Method for molding large ring piece by casting blank ring rolling |
| JP2011255410A (en) * | 2010-06-10 | 2011-12-22 | Mitsubishi Materials Corp | Method for manufacturing annular compact |
| CN102489639A (en) * | 2011-12-27 | 2012-06-13 | 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 |
| CN102689163A (en) * | 2012-06-18 | 2012-09-26 | 西南大学 | Liquid die forging rolling compound forming method for large ring member with different cross sections |
| CN102689151A (en) * | 2012-06-18 | 2012-09-26 | 西南大学 | Liquid die forging and rolling compound formation method for GH4033 high-temperature alloy irregular-section large ring piece |
| CN105170850A (en) * | 2015-09-23 | 2015-12-23 | 定州市金华蓝天汽车零部件有限公司 | Centrifugal casting duplex-metal composite ring part hot extend-rolling forming technology |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110479842A (en) * | 2019-08-02 | 2019-11-22 | 武汉理工大学 | Large thin-wall Y shape ring rolling-spinning combined shaping method |
| 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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Granted publication date: 20170922 Termination date: 20171228 |