CN104999009B - A kind of forging method of reduction NiCr20TiAl ring forging corner angle crackles - Google Patents
A kind of forging method of reduction NiCr20TiAl ring forging corner angle crackles Download PDFInfo
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- CN104999009B CN104999009B CN201510491345.6A CN201510491345A CN104999009B CN 104999009 B CN104999009 B CN 104999009B CN 201510491345 A CN201510491345 A CN 201510491345A CN 104999009 B CN104999009 B CN 104999009B
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Abstract
The present invention relates to a kind of forging method of reduction NiCr20TiAl ring forging corner angle crackles, forging stock is not carried out during forging is upset round as a ball, round as a ball to forging stock 1~2 encloses and controls round as a ball drafts in 5~10mm when the upset height to technological requirement, the turned-down edge of the cylindrical top corner angle of ring billet and bottom corner angle can not only be increased in the process, using this turned-down edge the radiating of the cylindrical top corner angle of ring billet and bottom corner angle can be effectively reduced when ring billet rolles over ring, prevent that its cooling is too fast, ring billet is avoided the problem of there is corner angle cracking during rolling over ring, bulge can also be eliminated, ensure that forging stock is smooth.By carrying out chamfering to the cylindrical top corner angle of ring billet and bottom corner angle after rolling over loop order section first, it is to avoid cylindrical corner angle radiating is too fast during ring billet rolles over ring at second, cause to roll over the problem of corner angle during ring ftracture and produce.
Description
Technical field
The present invention relates to forging field, more particularly to a kind of forging side of reduction NiCr20TiAl ring forging corner angle crackles
Method.
Background technology
Ring rolling is also known as ring rolling or reaming, and it is (to be also known as ring rolling machine or wealthy by ring rolling equipment-machine for rolling ring
Hole machine) ring is produced wall thickness reduction, enlarged-diameter, the moulding processing technology of cross section profile shaping, ring rolling is continuous office
Portion is moulding to shape technique, compared with Integral die-forged forming technology, and it, which has, is greatly lowered equipment tonnage and investment, vibration
Small, energy-saving material-saving the advantage of impact.At present, during the rolling ring after the ejection of NiCr20TiAl ring forgings, due to
The surface cooling velocities of NiCr20TiAl ring forgings is fast, causes edges and corners (the i.e. ring forging nose circle outside of NiCr20TiAl ring forgings
The intersection of face and forging upper and lower end face) cooling velocity it is fast, when the edges and corners temperature of NiCr20TiAl ring forgings is less than finish-forging
During temperature (900 DEG C of final forging temperature), edges and corners easily form cracking, and form Multiple site crack, have had a strong impact on the forging of the product
Quality and forging efficiency, or even cause to scrap.
The content of the invention
The applicant is directed to above-mentioned existing issue, has carried out Improvement and has reduced NiCr20TiAl ring forgings there is provided one kind
The forging method of corner angle crackle, NiCr20TiAl ring forgings corner angle crackle during ring is rolled over can be greatly reduced using this method
Generation, substantially increase NiCr20TiAl ring forgings forging quality and forging efficiency.
The technical solution adopted in the present invention is as follows：
A kind of forging method of reduction NiCr20TiAl ring forging corner angle crackles, comprises the following steps：
The first step：Composition of raw material and surface quality are tested；
Second step：By NiCr20TiAl raw material blanking to suitable size, then to the NiCr20TiAl former materials after blanking
Material carries out first time chamfering；
3rd step：Heated before forging：NiCr20TiAl raw material are loaded into heating furnace, furnace temperature of heating furnace is not more than 600 DEG C；The
Heating period before one forging：The NiCr20TiAl raw material for being put into heating furnace are warming up to 850 ± 10 DEG C, insulation with 50~90 DEG C/h
3-6h；Second heating period：NiCr20TiAl raw material are warming up to 1130 ± 10 from the second heating period with 50~100 DEG C/h
DEG C, it is incubated 3-6h；
4th step：Forging process：First forging stage：To the NiCr20TiAl raw material that heating-up temperature is 1130 ± 10 DEG C
Upset formation cake part, upset height is 150~230mm, and upset rear cake part then is put into the heating that furnace temperature is 1130 DEG C
1~2h is incubated in stove；
5th step：Using forge hydraulic press to it is above-mentioned it is upset after cake part raw material be punched out, NiCr20TiAl is former
Material punching hole diameter is 250~Φ of Φ 300, and the cake part formation ring billet is made after punching, the ring billet finally is put into furnace temperature
To be incubated 40min~1.5h in 1100~1130 DEG C of heating furnaces；
6th step：First rolles over loop order section：Rolling system, Ring Rolling Machine radial feed are carried out to ring billet obtained by the 5th step using Ring Rolling Machine
Speed is 0.5~1.5mm/s, and rolling system is air-cooled to room temperature and the cylindrical top corner angle of gained ring billet and bottom corner angle are distinguished after finishing
Carry out second of chamfering；
7th step：By gained ring billet be put into heating furnace with 50-90 DEG C/h be warming up to 850 DEG C insulation 1.5~2h, then with
Outlet temperature is warming up to 1100 DEG C of insulation 40min~1.5h by 50-100 DEG C/h for 850 DEG C of ring billet；
8th step：Second rolles over loop order section：Rolling system, Ring Rolling Machine radial feed are carried out to ring billet obtained by the 7th step using Ring Rolling Machine
Speed is 0.5~1.5mm/s, until ring billet is by the system of rolling over to suitable dimension；
9th step：Ring billet obtained by 8th step is air-cooled to room temperature；
Tenth step：The ring billet is machined to desired size；
11st step：Examine；
Its further technical scheme is：
It is not round as a ball to forging stock progress in forging process, until round as a ball to forging stock 1~2 during the upset height to technological requirement
It is 5~10mm to enclose and control round as a ball drafts；
First, which rolles over loop order section, completes the 40%~60% of ring billet total deformation；
The first time chamfering is rounding, and the R angular regions of the rounding are R15~R30；
Second of chamfering is bevelling, and the scope at the oblique angle is 15 × 45 °~30 × 45 °.
Beneficial effects of the present invention are as follows：
In the present invention, forge it is upset during forging stock is not carried out it is round as a ball, until during the upset height to technological requirement pair
Forging stock round as a ball 1~2 encloses and controls round as a ball drafts in 5~10mm, can not only increase ring billet in the process cylindrical
The turned-down edge of top corner angle and bottom corner angle, using this turned-down edge ring billet roll over ring when can effectively reduce the cylindrical top corner angle of ring billet and
The radiating of bottom corner angle, prevents that its cooling is too fast, it is to avoid ring billet during rolling over ring the problem of corner angle cracking occur, moreover it is possible to eliminates
Bulge, it is ensured that forging stock is smooth.Chamfering, chamfering side are carried out to the cylindrical top corner angle of ring billet and bottom corner angle after rolling over loop order section first
Formula is flexible and changeable, it is to avoid cylindrical corner angle radiating is too fast during ring billet rolles over ring at second, causes corner angle during rolling over ring to ftracture
The problem of produce.
Brief description of the drawings
The temperature curve schematic diagram that Fig. 1 heats for NiCr20TiAl ring forgings in the present invention before forging.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment of the present invention is illustrated.
Embodiment 1：
A kind of forging method of reduction NiCr20TiAl ring forging corner angle crackles comprises the following steps：
The first step：The inspection of raw and process materials, the chemical composition of the raw material is as shown in the table：
Second step：By NiCr20TiAl raw material blanking to Φ 480*450 (diameter * length), then to blanking after
NiCr20TiAl raw material carry out first time chamfering, and first time chamfering is rounding, and rounding angle value is R15.
3rd step：As shown in figure 1, being heated before forging：NiCr20TiAl raw material are loaded into heating furnace, furnace temperature of heating furnace is little
In 600 DEG C；Heating period before first forging：The NiCr20TiAl raw material for being put into heating furnace are warming up to 850 DEG C, guarantor with 50 DEG C/h
Warm 3h；Second heating period：NiCr20TiAl raw material are warming up to 1130 DEG C, insulation from the outlet temperature of the second heating period
5h。
4th step：Forging process：First forging stage：It is upset for 1130 DEG C of NiCr20TiAl raw material to outlet temperature
Cake part is formed, upset height is 170mm, while round as a ball drafts is 5mm, upset rear cake part then is put into furnace temperature is
1h is incubated in 1130 DEG C of heating furnace.In the first forging stage of above-mentioned forging process, the upset mistake of NiCr20TiAl raw material
Without round as a ball in journey, reach and just carry out round as a ball after the height of technological requirement, thus increase the turned-down edge of the cylindrical corner angle up and down of ring billet,
Ring billet is reduced the radiating of corner angle during subsequently rolling ring, prevent that edges and corners cooling is too fast, cause to ftracture now during rolling ring
The generation of elephant.
5th step：Using forge hydraulic press to it is above-mentioned it is upset after cake part raw material be punched out, forging hydraulic press
Pressure is set as 2000t, NiCr20TiAl raw material punching hole diameter is Φ 250, cake part formation ring billet is made after punching, then will
Ring billet, which is melted down, is heated to 1100 DEG C, is incubated 1h；
6th step：First rolles over loop order section：The system of rolling over is carried out to the Φ of Φ 1353/ to ring billet obtained by the 5th step using Ring Rolling Machine
1100*155mm, Ring Rolling Machine radial feed speed is 0.5mm/s, rolles over after ring is finished and is air-cooled to room temperature.Then on cylindrical to ring billet
Portion's corner angle and bottom corner angle carry out second of chamfering respectively, and the above-mentioned cylindrical top corner angle of ring billet and bottom corner angle refer to that ring billet is cylindrical
Outer face and ring billet upper surface and the intersection of lower surface, above-mentioned second of chamfering is bevelling, the scope at oblique angle for 15 ×
45 °, above-mentioned first, which rolles over loop order section, completes the 54% of ring billet total deformation.
7th step：Then outlet temperature is warming up to by 1100 DEG C of insulation 40min as 850 DEG C of ring billet using peak power.
8th step：Second rolles over loop order section：The system of rolling over is carried out to the Φ of Φ 2130/ to ring billet obtained by the 7th step using Ring Rolling Machine
1961*139mm, Ring Rolling Machine radial feed speed is 0.5mm/s, and above-mentioned second, which rolles over loop order section, completes ring billet total deformation
33%.
9th step：Ring billet obtained by 8th step is air-cooled to room temperature.
Tenth step：Ring billet is machined to the Φ 1980*120mm of Φ 2110/.
11st step：Examine.
Embodiment 2：
A kind of forging method of reduction NiCr20TiAl ring forging corner angle crackles comprises the following steps：
The first step：The inspection of raw and process materials, the chemical composition of the raw material is as shown in the table：
Second step：By NiCr20TiAl raw material blanking to Φ 480*450 (diameter * length), then to blanking after
NiCr20TiAl raw material carry out first time chamfering, and first time chamfering is rounding, and rounding angle value is R20.
3rd step：As shown in figure 1, being heated before forging：NiCr20TiAl raw material are loaded into heating furnace, furnace temperature of heating furnace is little
In 600 DEG C；Heating period before first forging：The NiCr20TiAl raw material for being put into heating furnace are warming up to 850 DEG C, guarantor with 75 DEG C/h
Warm 4h；Second heating period：NiCr20TiAl raw material are warming up to 1130 DEG C, insulation from the outlet temperature of the second heating period
4.5h。
4th step：Forging process：First forging stage：It is upset for 1130 DEG C of NiCr20TiAl raw material to outlet temperature
Cake part is formed, upset height is 180mm, while round as a ball drafts is 8mm, upset rear cake part then is put into furnace temperature is
1.5h is incubated in 1130 DEG C of heating furnace.In the first forging stage of above-mentioned forging process, NiCr20TiAl raw material are upset
During without round as a ball, reach and just carry out round as a ball after the height of technological requirement, thus increase collapsing for the cylindrical corner angle up and down of ring billet
Side, makes ring billet reduce the radiating of corner angle during ring is subsequently rolled over, and prevents that edges and corners cooling is too fast, causes to ftracture during rolling ring
The generation of phenomenon.
5th step：Using forge hydraulic press to it is above-mentioned it is upset after cake part raw material be punched out, forging hydraulic press
Pressure is set as 2000t, NiCr20TiAl raw material punching hole diameter is Φ 250, cake part formation ring billet is made after punching, then will
Ring billet, which is melted down, is heated to 1120 DEG C, is incubated 40min；
6th step：First rolles over loop order section：The system of rolling over is carried out to the Φ of Φ 1353/ to ring billet obtained by the 5th step using Ring Rolling Machine
1100*155mm, Ring Rolling Machine radial feed speed is 1mm/s, rolles over after ring is finished and is air-cooled to room temperature.Then to the cylindrical top of ring billet
Corner angle and bottom corner angle carry out second of chamfering respectively, and the above-mentioned cylindrical top corner angle of ring billet and bottom corner angle refer to that ring billet is cylindrical outer
End face and ring billet upper surface and the intersection of lower surface, above-mentioned second of chamfering are bevelling, and the scope at oblique angle is 20 × 45 °,
Above-mentioned first, which rolles over loop order section, completes the 52% of ring billet total deformation.
7th step：Then outlet temperature is warming up to by 1100 DEG C of insulation 40min as 850 DEG C of ring billet using peak power.
8th step：Second rolles over loop order section：The system of rolling over is carried out to the Φ of Φ 2157/ to ring billet obtained by the 7th step using Ring Rolling Machine
1980*135mm, Ring Rolling Machine radial feed speed is 0.9mm/s, and above-mentioned second, which rolles over loop order section, completes ring billet total deformation
30%.
9th step：Ring billet obtained by 8th step is air-cooled to room temperature.
Tenth step：Ring billet is machined to the Φ 2000*126mm of Φ 2137/.
11st step：Examine.
Above description is explanation of the invention, is not the restriction to invention, limited range of the present invention is referring to right
It is required that, in the case of the basic structure without prejudice to the present invention, the present invention can make any type of modification.
Claims (4)
1. a kind of forging method of reduction NiCr20TiAl ring forging corner angle crackles, it is characterised in that comprise the following steps：
The first step：Composition of raw material and surface quality are tested；
Second step：By NiCr20TiAl raw material blanking to suitable size, then the NiCr20TiAl raw material after blanking are entered
Row first time chamfering；
3rd step：Heated before forging：NiCr20TiAl raw material are loaded into heating furnace, furnace temperature of heating furnace is not more than 600 DEG C；First forging
The preceding heating period：The NiCr20TiAl raw material for being put into heating furnace are warming up to 850 ± 10 DEG C with 50~90 DEG C/h, 3- is incubated
6h；Second heating period：NiCr20TiAl raw material are warming up to 1130 ± 10 from the second heating period with 50~100 DEG C/h
DEG C, it is incubated 3-6h；
4th step：Forging process：First forging stage：It is upset for 1130 ± 10 DEG C of NiCr20TiAl raw material to heating-up temperature
Cake part is formed, upset height is 150~230mm, and then upset rear cake part is put into the heating furnace that furnace temperature is 1130 DEG C
It is incubated 1~2h；It is not round as a ball to forging stock progress in the forging process, until round as a ball to forging stock during the upset height to technological requirement
1~2 encloses and controls round as a ball drafts for 5~10mm；
5th step：Using forge hydraulic press to it is above-mentioned it is upset after cake part raw material be punched out, NiCr20TiAl raw material
Punching hole diameter is 250~Φ of Φ 300, the cake part formation ring billet is made after punching, the ring billet finally is put into furnace temperature is
40min~1.5h is incubated in 1100~1130 DEG C of heating furnace；
6th step：First rolles over loop order section：Rolling system, Ring Rolling Machine radial feed speed are carried out to ring billet obtained by the 5th step using Ring Rolling Machine
For 0.5~1.5mm/s, rolling system is air-cooled to room temperature and the cylindrical top corner angle of gained ring billet and bottom corner angle is carried out respectively after finishing
Second of chamfering；
7th step：Gained ring billet is put into heating furnace 850 DEG C of 1.5~2h of insulation are warming up to 50-90 DEG C/h, then with 50-
Outlet temperature is warming up to 1100 DEG C of insulation 40min~1.5h by 100 DEG C/h for 850 DEG C of ring billet；
8th step：Second rolles over loop order section：Rolling system, Ring Rolling Machine radial feed speed are carried out to ring billet obtained by the 7th step using Ring Rolling Machine
For 0.5~1.5mm/s, rolled over and made to suitable dimension up to ring billet；
9th step：Ring billet obtained by 8th step is air-cooled to room temperature；
Tenth step：The ring billet is machined to desired size；
11st step：Examine.
2. a kind of forging method of reduction NiCr20TiAl ring forging corner angle crackles as claimed in claim 1, it is characterised in that：
First, which rolles over loop order section, completes the 40%~60% of ring billet total deformation.
3. a kind of forging method of reduction NiCr20TiAl ring forging corner angle crackles as claimed in claim 1, it is characterised in that：
The first time chamfering is rounding, and the R angular regions of the rounding are R15~R30.
4. a kind of forging method of reduction NiCr20TiAl ring forging corner angle crackles as claimed in claim 1, it is characterised in that：
Second of chamfering is bevelling, and the scope at the oblique angle is 15 × 45 °~30 × 45 °.
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| CN201510491345.6A CN104999009B (en) | 2015-08-11 | 2015-08-11 | A kind of forging method of reduction NiCr20TiAl ring forging corner angle crackles |
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| CN201510491345.6A CN104999009B (en) | 2015-08-11 | 2015-08-11 | A kind of forging method of reduction NiCr20TiAl ring forging corner angle crackles |
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| CN106903246A (en) * | 2017-03-09 | 2017-06-30 | 中原特钢股份有限公司 | The forging technology of 2Cr11Mo1VNbN steel used for steam turbine blades forging |
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| JP2002035881A (en) * | 2000-07-24 | 2002-02-05 | Sumitomo Metal Ind Ltd | Forging method for circular forging stock and device therefor |
| CN104493027A (en) * | 2014-10-24 | 2015-04-08 | 无锡市派克重型铸锻有限公司 | Technology for forging duplex stainless steel |
| CN104438419B (en) * | 2014-10-24 | 2016-09-21 | 无锡派克新材料科技股份有限公司 | A kind of forging molding process of high tubular aluminum alloy forge piece |
| CN104607580B (en) * | 2015-01-23 | 2017-02-22 | 无锡派克新材料科技股份有限公司 | Forging forming technology of aluminum alloy straight-flanked ring with extra-large specification |
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