CN104772605A - Rolling forming method of small-dimension outer diameter conical cross-section annular workpiece - Google Patents
Rolling forming method of small-dimension outer diameter conical cross-section annular workpiece Download PDFInfo
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- CN104772605A CN104772605A CN201510163879.6A CN201510163879A CN104772605A CN 104772605 A CN104772605 A CN 104772605A CN 201510163879 A CN201510163879 A CN 201510163879A CN 104772605 A CN104772605 A CN 104772605A
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- blank
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a rolling forming method of a small-dimension outer diameter conical cross-section annular workpiece. The method comprises the steps of discharging, hole punching barrel blank manufacturing, profiling annular workpiece rolling forming, shaping, turning processing and the like. The annular workpiece rolling process designed by the invention has the advantages that through the precise control on the rolling speed, the one-step rolling forming can be realized on the outer diameter conical cross-section annular workpiece with the outer hole dimension being smaller than 400mm and the wall thickness difference being greater than 20mm, the energy source, material and work hour consumption due to mechanical cutting processing on steps can be obviously reduced, the damage to the metal flow line can be obviously reduced, and the production efficiency and the product performance are improved.
Description
Technical field
The present invention relates to a kind of method of ring parts rolling forming, the method for a kind of small-size external diameter tapered cross-section ring parts rolling forming, belongs to Metal Forming technical field specifically.
Background technology
At present, external diameter tapered cross-section ring is typically designed to and closes forging-ring part or rectangle ring.Closing forging-ring part is utilize the symmetrical profiling fixture of external diameter by the roll forming of ring base, the shortcoming of this technique is: 1) external diameter is less than to 400mm, is highly greater than the finished product ring of 150mm, being designed to close forging causes ring ratio of height to diameter excessive, blank-making technology difficulty strengthens, and causes the increase of core roll consumption simultaneously; 2) Wall-Thickness Difference is greater than to the product of 20mm, because the deflection of small size ring is less, easily causes conjunction forging to fill type deficiency; 3) need to carry out cuing open ring operation, increase processing cost.Straight-flanked ring forging can cause utilization rate of raw materials very low, and the amount of Vehicle Processing is simultaneously large, increases processing cost, reduces production efficiency.
Summary of the invention
Technical problem to be solved by this invention is, for the shortcoming of above prior art, proposes the method for the small-size external diameter tapered cross-section ring parts rolling forming that a kind of production efficiency is high, utilization rate of raw materials is high.
In order to solve the problems of the technologies described above, the invention provides the method for a kind of small-size external diameter tapered cross-section ring parts rolling forming, comprising the following steps:
1) blanking: select bar diameter to be less than the bar of punching bucket minimum diameter, height and the diameter ratio of material section should be not more than 3.5;
2) punching bucket base: the material section heated is positioned in profiling punching bucket carries out centering, jumping-up, punching, trimming, makes profiling cross section blank;
3) profiling ring parts rolling forming: the driven roller of rolling equipment is designed to finish to gauge mould, described finish to gauge mould molding part carries out contoured design according to finished product, and finish to gauge mould two side flange root spacing equals blank height dimension, and inclination angle is designed to 3 ° ~ 5 °; Blank forms contact in rolling between core roller and finish to gauge mould, progressively realizes fitting completely, and during the pre-provisioning request of ring size, the annular forging piece finish to gauge of external diameter tapered cross-section completes;
4) shaping: the forging after finish to gauge turns trimmer immediately and carries out shaping operation, eliminates forging endoporus horn mouth and carries out full circle to ring;
5) Vehicle Processing: profiling ring becomes product through a small amount of Vehicle Processing.
The present invention limits technical scheme further: the method for aforesaid small-size external diameter tapered cross-section ring parts rolling forming, and in described step (3), during rolling, the range of speeds of driven roller is: n
min≤ n≤n
max,
Wherein b is the axial length of ring, and m is friction factor, and value is 0.65-0.72; R is ring maximum outside diameter, and r is ring minimum outer diameter, R
1for driven roller radius, R
2for core roller radius.
The method of aforesaid small-size external diameter tapered cross-section ring parts rolling forming, in described step (1) when blanking, for the ring of internal diameter 170 ~ 250mm, the high 4 ~ 5mm of blank aspect ratio finished product height; For the ring of internal diameter 250 ~ 350mm, the high 5 ~ 7mm of blank aspect ratio finished product height.
The method of aforesaid small-size external diameter tapered cross-section ring parts rolling forming, in described step (2) when punching bucket base, step place outside blank selects Rouno Cormer Pregrinding Wheel transition R20 ~ R35mm, blank inner diameter vertical in upper and lower end face, blank both ends of the surface diameter of bore value of delta≤5mm; Punching bucket draw taper is designed to 5 ° ~ 8 °, and in punching bucket, the height of moulding section equals blank height; Stock volume and drift volume sum account for 93% ~ 96% of the volume of punching bucket; Low 20 ~ the 25mm of height of the aspect ratio blank of drift, the gradient of drift 3 ° ~ 5 °.
The method of aforesaid small-size external diameter tapered cross-section ring parts rolling forming, the height of the flange of described finish to gauge mould should lower than the wall thickness of respective side finished product ring.
The method of aforesaid small-size external diameter tapered cross-section ring parts rolling forming, in described step (3) when profiling ring parts rolling forming, the blank made is placed into heating furnace to carry out heating with stove, the heating-up temperature of ordinary carbon steel and low-alloy steel is 1050 DEG C ~ 1150 DEG C, cold blank melts down the heating and thermal insulation time and calculates by wall thickness 3 ~ 5min/10mm, and hot blank melts down the heating and thermal insulation time and calculates by wall thickness 1.5 ~ 3min/10mm.
Further, the method of aforesaid small-size external diameter tapered cross-section ring parts rolling forming, in described step (2) when punching bucket base, the material section cut is placed into heating furnace to carry out heating with stove, the heating-up temperature of ordinary carbon steel and low-alloy steel is 1050 DEG C ~ 1150 DEG C, and the temperature retention time after blank to temperature calculates by bar diameter 3 ~ 5min/10mm.
The invention has the beneficial effects as follows: ring piece rolling technique designed by the present invention, by the accurate control to mill speed, a roll forming can be realized for the external diameter tapered cross-section ring that outer hole dimension is less than 400mm, Wall-Thickness Difference is greater than 20mm, significantly reduce machine cut processing step and the energy caused, material and expenditure of time, and the destruction to metal streamline, improve production efficiency and properties of product, ring forging presentation quality is good, forging flow lines completes, and has saved raw material and has drastically increased production efficiency.
Detailed description of the invention
The present invention is described in further detail below:
Embodiment 1
The method of a kind of small-size external diameter tapered cross-section ring parts rolling forming that the present embodiment provides, realizes as follows:
1) blanking: according to punching bucket size, selects bar diameter to be less than the bar of punching bucket minimum diameter, and height and the diameter ratio of material section should be not more than 3.5, according to theoretical blank quality by the bar stock saw cutting section of one-tenth.
2) punching bucket base: the material section cut is placed into heating furnace and carries out with stove heating, the heating-up temperature of ordinary carbon steel and low-alloy steel is 1050 DEG C ~ 1150 DEG C, and the temperature retention time after blank to temperature calculates by bar diameter 3 ~ 5min/10mm.Carry out centering, jumping-up, punching, trimming after heating material section is positioned over punching bucket, make profiling cross section blank.
For the ring of internal diameter 170 ~ 250mm, the high 4 ~ 5mm of blank aspect ratio finished product height; For the ring of internal diameter 250 ~ 350mm, the high 5 ~ 7mm of blank aspect ratio finished product height.Blank external diameter is according to finished product external diameter contoured design, and step place selects Rouno Cormer Pregrinding Wheel transition R20 ~ R35mm.Blank internal diameter in principle perpendicular to upper and lower end face, both ends of the surface diameter of bore value of delta≤5mm.Short transverse carries out sub-material calculating to blank, and sustained height section blank volume is as far as possible close to finished-product volume.
Punching bucket draw taper is designed to 5 ° ~ 8 °, and in bucket, the height of moulding section equals blank height, and in bucket, hole forming circular arc and blank external arc are fitted.Blank volume and drift volume sum account for 93% ~ 96% of the volume of punching bucket, and ratio comparatively conference causes upper surface overlap, too little, can be discontented with the larger end face of formation and to collapse angle because filling type.
Low 20 ~ the 25mm of height of the aspect ratio blank of drift, height of punch is too high, rushes core too thick, increases material consumption; The too low meeting of height of punch makes blank lower surface form boss, affects blank presentation quality.The gradient of drift 3 ° ~ 5 °, avoids punching recess and horn mouth.
3) profiling ring parts rolling forming: the blank made is placed into heating furnace and carries out heating with stove, the heating-up temperature of ordinary carbon steel and low-alloy steel is 1050 DEG C ~ 1150 DEG C, cold blank melts down the heating and thermal insulation time and calculates by wall thickness 3 ~ 5min/10mm, and hot blank melts down the heating and thermal insulation time and calculates by wall thickness 1.5 ~ 3min/10mm.
Finish to gauge mould molding part carries out contoured design according to finished product, and two side flange root spacing equal blank height dimension, and inclination angle is designed to 3 ° ~ 5 °.The height of flange should lower than the wall thickness of respective side finished product ring, and during to ensure that ring rolls delivery gauge, core roller and flange do not interfere.Finish to gauge mould is fixed on home roll axle by both sides anchor ear, and mold integral is mediated, and is beneficial to the operation of measuring roller and armful roller.Before finish to gauge operation, ring rolls supported on both sides roller is smoothed, make core roll axis and finish to gauge mold shaft line parallel.
The blank heated is transported to ring rolls station, when blank and finish to gauge mould are pressed close to, start finish to gauge operate, blank forms contact in rolling between core roller and finish to gauge mould, there is plastic deformation under pressure in the metal in deformed area, wall thickness is thinning gradually, blank and finish to gauge mould realize fitting completely simultaneously, and ring size is grown up gradually; When ring size reaches delivery gauge requirement, finish to gauge has operated.When rolling, the range of speeds of driven roller is:
,
，
，
Wherein b is the axial length of ring, and m is friction factor, and value is 0.65-0.72; R is ring maximum outside diameter, and r is ring minimum outer diameter, R
1for driven roller radius, R
2for core roller radius.
4) shaping: the forging after finish to gauge turns trimmer immediately and carries out shaping operation, eliminates forging endoporus horn mouth and carries out full circle to ring, making forging ' s block dimension meet Geometrical Tolerance Principle.During shaping, diametric shaping amount is 3 ~ 5mm.
5) Vehicle Processing: profiling ring becomes product through a small amount of Vehicle Processing.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (7)
1. a method for small-size external diameter tapered cross-section ring parts rolling forming, is characterized in that comprising the following steps:
1) blanking: select bar diameter to be less than the bar of punching bucket minimum diameter, height and the diameter ratio of material section should be not more than 3.5;
2) punching bucket base: the material section heated is positioned in profiling punching bucket carries out centering, jumping-up, punching, trimming, makes profiling cross section blank;
3) profiling ring parts rolling forming: the driven roller of rolling equipment is designed to finish to gauge mould, described finish to gauge mould molding part carries out contoured design according to finished product, and finish to gauge mould two side flange root spacing equals blank height dimension, and inclination angle is designed to 3 ° ~ 5 °; Blank forms contact in rolling between core roller and finish to gauge mould, progressively realizes fitting completely, and during the pre-provisioning request of ring size, the annular forging piece finish to gauge of external diameter tapered cross-section completes;
4) shaping: the forging after finish to gauge turns trimmer immediately and carries out shaping operation, eliminates forging endoporus horn mouth and carries out full circle to ring;
5) Vehicle Processing: profiling ring becomes product through a small amount of Vehicle Processing.
2. the method for small-size external diameter tapered cross-section according to claim 1 ring parts rolling forming, is characterized in that: in described step (3), during rolling, the range of speeds of driven roller is: n
min≤ n≤n
max,
Wherein b is the axial length of ring, and m is friction factor, and value is 0.65-0.72; R is ring maximum outside diameter, and r is ring minimum outer diameter, R
1for driven roller radius, R
2for core roller radius.
3. the method for small-size external diameter tapered cross-section according to claim 1 ring parts rolling forming, is characterized in that: in described step (1) when blanking, for the ring of internal diameter 170 ~ 250mm, the high 4 ~ 5mm of blank aspect ratio finished product height; For the ring of internal diameter 250 ~ 350mm, the high 5 ~ 7mm of blank aspect ratio finished product height.
4. the method for small-size external diameter tapered cross-section according to claim 1 ring parts rolling forming, it is characterized in that: in described step (2) when punching bucket base, step place outside blank selects Rouno Cormer Pregrinding Wheel transition R20 ~ R35mm, blank inner diameter vertical in upper and lower end face, blank both ends of the surface diameter of bore value of delta≤5mm; Punching bucket draw taper is designed to 5 ° ~ 8 °, and in punching bucket, the height of moulding section equals blank height; Stock volume and drift volume sum account for 93% ~ 96% of the volume of punching bucket; Low 20 ~ the 25mm of height of the aspect ratio blank of drift, the gradient of drift 3 ° ~ 5 °.
5. the method for small-size external diameter tapered cross-section according to claim 1 ring parts rolling forming, is characterized in that: the height of the flange of described finish to gauge mould should lower than the wall thickness of respective side finished product ring.
6. the method for small-size external diameter tapered cross-section according to claim 1 ring parts rolling forming, it is characterized in that: in described step (3) when profiling ring parts rolling forming, the blank made is placed into heating furnace to carry out heating with stove, the heating-up temperature of ordinary carbon steel and low-alloy steel is 1050 DEG C ~ 1150 DEG C, cold blank melts down the heating and thermal insulation time and calculates by wall thickness 3 ~ 5min/10mm, and hot blank melts down the heating and thermal insulation time and calculates by wall thickness 1.5 ~ 3min/10mm.
7. the method for small-size external diameter tapered cross-section according to claim 1 ring parts rolling forming, it is characterized in that: in described step (2) when punching bucket base, the material section cut is placed into heating furnace to carry out heating with stove, the heating-up temperature of ordinary carbon steel and low-alloy steel is 1050 DEG C ~ 1150 DEG C, and the temperature retention time after blank to temperature calculates by bar diameter 3 ~ 5min/10mm.
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| CN201510163879.6A CN104772605B (en) | 2015-04-09 | 2015-04-09 | A kind of method of small-size external diameter tapered cross-section ring parts rolling forming |
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|---|---|---|---|
| CN201510163879.6A CN104772605B (en) | 2015-04-09 | 2015-04-09 | A kind of method of small-size external diameter tapered cross-section ring parts rolling forming |
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| CN104772605B CN104772605B (en) | 2017-06-16 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105689629A (en) * | 2016-03-09 | 2016-06-22 | 无锡市派克重型铸锻有限公司 | Free forging method of novel ultrahigh conical ring part |
| CN106695256A (en) * | 2016-12-22 | 2017-05-24 | 江苏翔能科技发展有限公司 | Ring rolling technology for profiling and shaping large-tapered wind-electricity bearing inner ring |
| CN108555197A (en) * | 2018-05-03 | 2018-09-21 | 江苏翔能科技发展有限公司 | Monolithic base multi-disc assembling process and the blanking device and molding die for being applicable in it |
| CN108817093A (en) * | 2018-04-27 | 2018-11-16 | 马兴法 | A kind of special-shaped ring blank forming method |
| CN109227044A (en) * | 2018-09-29 | 2019-01-18 | 河北博途仓储设备有限公司 | Novel upright post for shelf processing technology |
| CN109723613A (en) * | 2019-01-31 | 2019-05-07 | 大冶特殊钢股份有限公司 | A kind of asymmetric special-shaped ring of large size for wind power equipment and preparation method |
| CN112588950A (en) * | 2021-01-25 | 2021-04-02 | 重庆理工大学 | Spring holding and carrying processing method |
| CN116522521A (en) * | 2023-03-24 | 2023-08-01 | 江苏翔能科技发展有限公司 | Method for determining axial diameter growth speed difference in conical ring rolling |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007130673A (en) * | 2005-11-11 | 2007-05-31 | Sanyo Special Steel Co Ltd | Manufacturing method of outer and inner ring of bearing race using in bearing steel pipe |
| CN101279347A (en) * | 2008-04-23 | 2008-10-08 | 贵州航宇科技发展有限公司 | Method for rolling and shaping stainless steel conical ring |
| CN102319855A (en) * | 2011-08-27 | 2012-01-18 | 江阴振宏重型锻造有限公司 | Method for forging thick-walled ring-shaped parts |
| CN102847862A (en) * | 2012-11-06 | 2013-01-02 | 苏州汉金模具技术有限公司 | Low-pressure composite forging process for bearing ring |
| CN103302462A (en) * | 2013-07-02 | 2013-09-18 | 江苏翔能科技发展有限公司 | Small abnormal-shape combined forging and ring-rolling process |
| CN103522007A (en) * | 2013-09-26 | 2014-01-22 | 贵州航宇科技发展股份有限公司 | Method for manufacturing TC25 titanium alloy ring piece |
| CN104191165A (en) * | 2014-08-04 | 2014-12-10 | 贵州航宇科技发展股份有限公司 | Method for forging and forming high temperature alloy large special-shaped ring |
-
2015
- 2015-04-09 CN CN201510163879.6A patent/CN104772605B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007130673A (en) * | 2005-11-11 | 2007-05-31 | Sanyo Special Steel Co Ltd | Manufacturing method of outer and inner ring of bearing race using in bearing steel pipe |
| CN101279347A (en) * | 2008-04-23 | 2008-10-08 | 贵州航宇科技发展有限公司 | Method for rolling and shaping stainless steel conical ring |
| CN102319855A (en) * | 2011-08-27 | 2012-01-18 | 江阴振宏重型锻造有限公司 | Method for forging thick-walled ring-shaped parts |
| CN102847862A (en) * | 2012-11-06 | 2013-01-02 | 苏州汉金模具技术有限公司 | Low-pressure composite forging process for bearing ring |
| CN103302462A (en) * | 2013-07-02 | 2013-09-18 | 江苏翔能科技发展有限公司 | Small abnormal-shape combined forging and ring-rolling process |
| CN103522007A (en) * | 2013-09-26 | 2014-01-22 | 贵州航宇科技发展股份有限公司 | Method for manufacturing TC25 titanium alloy ring piece |
| CN104191165A (en) * | 2014-08-04 | 2014-12-10 | 贵州航宇科技发展股份有限公司 | Method for forging and forming high temperature alloy large special-shaped ring |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105689629A (en) * | 2016-03-09 | 2016-06-22 | 无锡市派克重型铸锻有限公司 | Free forging method of novel ultrahigh conical ring part |
| CN106695256A (en) * | 2016-12-22 | 2017-05-24 | 江苏翔能科技发展有限公司 | Ring rolling technology for profiling and shaping large-tapered wind-electricity bearing inner ring |
| CN108817093A (en) * | 2018-04-27 | 2018-11-16 | 马兴法 | A kind of special-shaped ring blank forming method |
| CN108555197A (en) * | 2018-05-03 | 2018-09-21 | 江苏翔能科技发展有限公司 | Monolithic base multi-disc assembling process and the blanking device and molding die for being applicable in it |
| CN109227044A (en) * | 2018-09-29 | 2019-01-18 | 河北博途仓储设备有限公司 | Novel upright post for shelf processing technology |
| CN109723613A (en) * | 2019-01-31 | 2019-05-07 | 大冶特殊钢股份有限公司 | A kind of asymmetric special-shaped ring of large size for wind power equipment and preparation method |
| CN109723613B (en) * | 2019-01-31 | 2024-01-16 | 大冶特殊钢有限公司 | Large-scale asymmetric special-shaped ring piece for wind power equipment and preparation method |
| CN112588950A (en) * | 2021-01-25 | 2021-04-02 | 重庆理工大学 | Spring holding and carrying processing method |
| CN116522521A (en) * | 2023-03-24 | 2023-08-01 | 江苏翔能科技发展有限公司 | Method for determining axial diameter growth speed difference in conical ring rolling |
| CN116522521B (en) * | 2023-03-24 | 2024-03-22 | 江苏翔能科技发展有限公司 | Method for determining axial diameter growth speed difference in conical ring rolling |
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| CN104772605B (en) | 2017-06-16 |
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