CN113579130B - Rolling method for special-shaped thin-wall casing ring forging with external island bosses - Google Patents
Rolling method for special-shaped thin-wall casing ring forging with external island bosses Download PDFInfo
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- CN113579130B CN113579130B CN202110861755.0A CN202110861755A CN113579130B CN 113579130 B CN113579130 B CN 113579130B CN 202110861755 A CN202110861755 A CN 202110861755A CN 113579130 B CN113579130 B CN 113579130B
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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
-
- 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
- B21H1/22—Making articles shaped as bodies of revolution characterised by use of rolls having circumferentially varying profile ; Die-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/761—Making machine elements elements not mentioned in one of the preceding groups rings
Abstract
The invention discloses a rolling method of a special-shaped thin-wall casing ring forging with an outer island boss, wherein one part of a target special-shaped thin-wall casing ring forging is a nearly rectangular section ring, the other part of the target special-shaped thin-wall casing ring forging is a nearly conical cylinder ring and is provided with the outer island boss, a nearly rectangular section ring blank is obtained by blanking, upsetting and punching, then a thick-wall special-shaped section ring blank is obtained by single-side flaring, then a special-shaped section ring blank is obtained by rolling, then a special-shaped section ring blank with an inner rotary boss is obtained by rough rolling, the inner rotary boss is a ring-shaped protrusion which is positioned at the inner side of the nearly conical cylinder ring and corresponds to the height position of the outer island boss, then the roundness precision of the special-shaped section ring blank with the inner rotary boss is improved by reshaping, finally, the outer surface of the special-shaped thin-wall casing ring forging is formed by near-net forming, and the volume of the inner rotary boss is transferred to the outer surface to obtain the outer island boss. The outer surface of the specially-shaped thin-wall casing ring forging is formed near net, the outer island boss is obtained on the outer surface, the outer diameter and the outer island boss precision can be ensured, and the machining allowance is low.
Description
Technical Field
The invention belongs to the technical field of forging and ring rolling, and particularly relates to a rolling method of a special-shaped thin-wall casing ring forging with an outer island boss.
Background
In the technical field of forging and ring rolling, the forging process of rolling a ring blank with a smaller diameter and a larger wall thickness into a ring forging with a larger diameter and a thinner wall thickness is called ring rolling. The existing rolling equipment can be divided into a horizontal ring rolling mill and a vertical ring rolling mill or a radial ring rolling mill and a radial-axial ring rolling mill according to different classifications. These ring rolling mills are capable of rolling ring forged products of various cross-sectional shapes by means of various roll profiles. However, ring forging products produced by the existing ring rolling mills and rolling processes have axisymmetric revolving body characteristics, and ring pieces with island bosses on the outer surface of the revolving body cannot be rolled (the island bosses in the description indicate that the bosses have a certain height and are discontinuous and are randomly distributed on the outer surface of the ring piece of the revolving body).
For the ring part with the island boss, such as the special-shaped thin-wall casing ring forging with the island boss, a large machining allowance is generally reserved, at present, a larger rotary ring forging which envelops the island boss is rolled firstly, the island boss and other fine contours are enveloped in a should plane to form a ring forging with a very large wall thickness, at the moment, the wall thickness is generally more than 40mm, and then redundant materials except the boss on the outer surface are removed in a numerical control milling mode (generally, a 3D curved surface of the outer surface needs 5-axis linkage milling because a numerical control lathe cannot process), so that raw materials are wasted (the material utilization rate is only about 5%), and due to the fact that the ring part is not in an axial symmetry rotary characteristic, only 5-axis numerical control processing can be adopted, the machining period and the cost are greatly increased, the integral manufacturing efficiency of products is reduced, and particularly in the aerospace field, the high-temperature alloy titanium alloy material is used in a large amount, so that the processing difficulty is higher, and the waste raw material is more expensive. At present, even if the cover die is used for closed rolling, because the feeding and die filling processes are complicated, the temperature drop of the ring blank is too large, so that the precise characteristics of the ring piece are difficult to form, and even cannot be formed.
Disclosure of Invention
The invention aims to provide a rolling method of a special-shaped thin-wall casing ring forging with an outer island boss.
The technical scheme adopted by the invention is as follows:
a method for rolling a special-shaped thin-wall case ring forging with an outer island key boss comprises the steps that one part of a target special-shaped thin-wall case ring forging is a ring with a nearly rectangular section, the other part of the target special-shaped thin-wall case ring forging is a ring with a nearly conical cylinder ring and is provided with the outer island boss, blanking, upsetting and punching are carried out to obtain a ring blank with the nearly rectangular section, then a single-side flaring is carried out to obtain a ring blank with a thick-wall special-shaped section, then the ring blank with the special-shaped section is rolled to obtain a ring blank with an inner rotary boss, the inner rotary boss is a ring-shaped protrusion which is located at the position, corresponding to the height position of the outer island boss, of the inner side of the nearly conical cylinder ring, the roundness precision of the ring blank with the special-shaped section with the inner rotary boss is improved through shaping, finally, the outer surface of the special-shaped thin-wall case ring forging is subjected to net shaping, and the volume of the inner rotary boss is transferred to the outer surface to obtain the outer island boss;
the adopted finish rolling die comprises a driving roller, a core roller and a combined cover die which can rotate actively, wherein the driving roller or the core roller can feed linearly; the combined cover die comprises a cover die and a plurality of split dies which can be enclosed into a circle, the whole circle of split dies are detachably matched, inserted and installed on a conical surface of an inner ring of the cover die, an outer ring of the cover die is in contact with the driving roller and can be driven to rotate by the driving roller, the inner surface of the whole circle of split dies is matched with the outer surface of the special-shaped thin-wall casing ring forging, the outer surface of a working part of the core die is matched with the inner surface of the special-shaped thin-wall casing ring forging, the split dies have a structure for axially limiting a ring blank, and grooves matched with bosses of an outer island are formed in corresponding positions of the inner surface.
Further, the target size of each stage is determined by backward pushing the thin-walled profiled casing part with the island boss, the size of the thin-walled profiled casing ring forging with the island boss is obtained according to the size of the thin-walled profiled casing part with the island boss and the forging allowance placed on two sides, the outer island boss of the thin-walled profiled casing ring forging with the island boss is removed, the volumes and multiples of all the outer island bosses are arranged on the inner surface of the corresponding height position to obtain the size of the ring blank with the special cross section of the inner rotary boss, the ring blank with the special cross section is obtained by estimation according to the selected rolling ratio range and the principle that the axial cross section is equal, the size of the ring blank with the thick-wall special cross section is obtained by estimation according to the selected rolling ratio range and the principle that the axial cross section is equal, the diameter of a punch is used as the inner diameter, the size of the ring blank with the nearly rectangular cross section is determined according to the selected height ratio in equal proportion, and finally, determining the blanking volume according to the size of the ring blank with the approximately rectangular section.
Further, the outer island boss is a cylinder, a triangular prism or a rectangular column.
And further, before finish rolling is started, the whole circle of split dies are axially placed into the inner ring of the sleeve die and are compressed, and after finish rolling is completed, the whole circle of split dies are pressed and removed from the opposite direction.
Furthermore, the conical angle between the split mold and the inner ring of the cover mold is 1-3 degrees.
Further, the number of the split molds is determined according to the number of the outer island bosses.
The beneficial effects of the invention are:
the invention firstly reasonably distributes the volume through a series of preforming processes to obtain the special-shaped section ring blank with the inner rotary lug boss, then forms the outer surface of the special-shaped thin-wall casing ring forging through fine rolling and near net forming and transfers the volume of the inner rotary lug boss to the outer surface to obtain the outer island lug boss, thereby not only ensuring the final outer diameter precision of the ring forging, but also ensuring the precision of the outer surface of the ring forging and the outer island lug boss, greatly improving the ring rolling precision, reducing the wall thickness to be less than 20mm, improving the material utilization rate by more than 30 percent, greatly reducing the machining allowance of the ring forging, greatly improving the production efficiency and reducing the production cost. According to the finish rolling die, the split die is matched with the conical surface of the inner ring of the cover die, so that the split die is convenient to mount and take out, the die can be rapidly mounted, the temperature reduction of a ring blank is reduced, a tool is convenient to take out, and the split die is tightly matched with the conical surface of the cover die due to the axial force of the ring blank in the rolling process.
Drawings
FIG. 1 is a thin-walled profiled casing part with island bosses according to an embodiment of the invention.
FIG. 2 is a profiled thin-walled casing ring forging with island bosses according to an embodiment of the invention.
FIG. 3 is a ring blank with a profiled cross section with an internal swivel boss in an embodiment of the present invention.
Figure 4 is a profiled section ring blank in an embodiment of the invention.
Fig. 5 is a thick-walled profiled section ring blank in an embodiment of the present invention.
Fig. 6 is a ring blank of approximately rectangular cross-section in an embodiment of the present invention.
FIG. 7 is a schematic view showing the operation of the finish rolling stage according to the embodiment of the present invention.
In the figure: 1-outer island boss; 2-inner rotary boss; 3-driving the roller; 4-die casting; 5-split mold; 6-special-shaped section ring blank with inner rotary boss; 7-core roll; 8-groove.
Detailed Description
The invention is further described below with reference to the drawings and examples.
A rolling method of a special-shaped thin-wall casing ring forging with an outer island boss comprises the following steps:
s1, determining the target size of each stage according to the back-pushing of the special-shaped thin-wall casing part with the island boss
As shown in fig. 1, in this embodiment, one part of the special-shaped thin-walled casing part with external island bosses is a nearly rectangular cross-section ring, the other part of the special-shaped thin-walled casing part is a nearly conical cylinder ring and has an external island boss 1, the material is TC4, the outer diameter of the large end is 642mm, the outer diameter of the small end is 528mm, the axial height is 177mm, the uniform wall thickness is 2mm, the height of the nearly rectangular cross-section ring is 74mm, 12 external island bosses 1 in various shapes are uniformly distributed on the outer surface of the nearly conical cylinder ring along the circumferential direction (the shapes of the external island bosses 1 are set as required, generally common columns, in this embodiment, three types of columns, triangular prisms and rectangular columns), and the height of the external island bosses 1 is 10 mm;
firstly, obtaining the size of the special-shaped thin-wall casing ring forging with the island bosses according to the size of the special-shaped thin-wall casing part with the island bosses and forging allowance (10 mm is selected) on two sides, as shown in fig. 2;
then, removing the outer island bosses 1 of the special-shaped thin-wall casing ring forging with the outer island bosses, and arranging the volume of all the outer island bosses 1 which is multiple times (4-8 times, 6 times) on the inner surface of the corresponding height position to obtain the size of the special-shaped section ring blank 6 with the inner rotary boss, as shown in fig. 3;
then, estimating according to a selected rolling ratio range (1.3-1.7, 1.5 is taken) and an axial sectional area equality principle to obtain the special-shaped section ring blank, wherein as shown in figure 4, the outer diameter of the small end is 400mm, the inner diameter of the small end is 320mm, the outer diameter of the large end is 544mm, and the inner diameter of the large end is 452 mm;
then estimating the size of the thick-wall profiled cross-section ring blank according to the selected rolling ratio range and the principle that the axial sectional areas are equal, as shown in figure 5;
and then, the diameter of the punch is used as the inner diameter (120 mm is selected), and the size of the ring blank with the approximate rectangular section is determined according to the equal proportion of the selected height ratio (the height of the ring blank with the approximate rectangular section is 1.1-1.2 times of the height of the ring blank with the thick-wall special-shaped section), as shown in fig. 6, the inner diameter is 120mm, the small end outer diameter is 268mm, and the large end outer diameter is 290 mm.
And finally, determining the blanking volume according to the size of the ring blank with the approximately rectangular section.
S2, reasonably distributing the volume through a series of pre-forming processes to obtain the special-shaped section ring blank 6 with the inner rotary boss
Firstly, blanking, upsetting and punching to obtain a ring blank with a nearly rectangular section, then heating the ring blank with the nearly rectangular section to a forming temperature, flaring a single side in a die to obtain a ring blank with a thick-wall irregular section, then rolling the ring blank with the thick-wall irregular section on a ring rolling mill to obtain the ring blank with the irregular section, replacing a driving roller and a core roller, firstly, rough rolling to obtain the ring blank 6 with the irregular section with an inner rotary boss, wherein the inner rotary boss 2 is a ring-shaped protrusion which is positioned at the position, corresponding to the height position of the outer island boss 1, of the inner side of the nearly conical cylinder ring, and then shaping to improve the roundness precision of the ring blank 6 with the irregular section and the inner rotary boss.
S3, finish rolling to obtain the special-shaped thin-wall casing ring forging with the outer island boss
As shown in fig. 7, the finish rolling die comprises a driving roller 3, a core roller 7 and a combined cover die which can actively rotate, and the driving roller 3 or the core roller 7 can be linearly fed; the combined cover die comprises a cover die 4 and a plurality of split dies 5 which can be enclosed into a circle (the number of the split dies 5 is determined according to the number of the outer island bosses 1, 12 split dies 5 are adopted in the embodiment), the whole circle of split dies 5 are detachably matched, inserted and installed on a conical surface of an inner ring of the cover die 4 (the conical surface between the split dies 5 and the inner ring of the cover die 4 is 1-3 degrees), an outer ring of the cover die 4 is in contact with the driving roller 3 and can be driven by the driving roller 3 to rotate, the inner surface of the whole circle of split dies 5 is matched with the outer surface of the special-shaped thin-wall casing ring forging, the outer surface of a working part of the core die 7 is matched with the inner surface of the special-shaped thin-wall casing ring forging, the split dies 5 have a structure for axially limiting the ring blank 6, and grooves 8 matched with the outer island bosses 1 are arranged at corresponding positions of the inner surface;
before finishing rolling, firstly putting the special-shaped section ring blank 6 with the inner rotary boss and the whole circle of split dies 5 into an inner ring of a sleeve die 4 along the axial direction and pressing the ring blank, when finishing rolling is performed, nearly net-forming the outer surface of the special-shaped thin-wall casing ring forging and transferring the volume of the inner rotary boss 2 to the outer surface to obtain an outer island boss 1, wherein redundant materials are remained on the inner surface to facilitate turning removal, in the hot forming process, the ring blank needs to be reheated to the hot forming temperature in due time according to the reduction condition of the temperature of a workpiece, after finishing rolling is completed, the ring of split dies 5 are pressed off in the opposite direction on a press machine, the split dies 5 are separated, and the special-shaped thin-wall casing ring forging with the outer island boss is taken out.
According to the invention, the volume is reasonably distributed through a series of preforming processes to obtain the special-shaped section ring blank 6 with the inner rotary boss, then the outer surface of the special-shaped thin-wall casing ring forging is precisely rolled and formed, and the volume of the inner rotary boss 2 is transferred to the outer surface to obtain the outer island boss 1, so that the final outer diameter precision of the ring forging can be ensured, the precision of the outer surface of the ring forging and the precision of the outer island boss 1 can also be ensured, the rolling precision of the ring forging is greatly improved, the wall thickness is reduced to be below 20mm, the material utilization rate is improved by more than 30%, the machining allowance of the ring forging is greatly reduced, the production efficiency is greatly improved, and the production cost is reduced. According to the finish rolling die, the split die 5 is matched with the conical surface of the inner ring of the sleeve die 4, so that the split die 5 is convenient to mount and take out, the die can be rapidly mounted, the temperature of the ring blank 6 is reduced, the ring blank can be conveniently taken out by a tool, and the split die 5 is tightly matched with the conical surface of the sleeve die 4 under the axial force of the ring blank 6 in the rolling process.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (6)
1. A rolling method of a special-shaped thin-wall casing ring forging with an outer island boss is characterized by comprising the following steps: one part of the target special-shaped thin-wall case ring forging is a nearly rectangular section ring, the other part of the target special-shaped thin-wall case ring forging is a nearly conical cylinder ring and is provided with an outer island boss, a nearly rectangular section ring blank is obtained by blanking, upsetting and punching, a thick-wall special-shaped section ring blank is obtained by unilateral flaring, a special-shaped section ring blank is obtained by rolling, then a special-shaped section ring blank with an inner rotary boss is obtained by rough rolling, the inner rotary boss is a circle of annular protrusion which is positioned at the position of the inner side of the nearly conical cylinder ring corresponding to the height of the outer island finish rolling boss, the roundness precision of the special-shaped section ring blank with the inner rotary boss is improved by reshaping, and finally, the outer surface of the special-shaped thin-wall case ring forging is formed by near net and the volume of the inner rotary boss is transferred to the outer surface to obtain the outer island boss;
the adopted finish rolling die comprises a driving roller, a core roller and a combined cover die which can actively rotate, and the driving roller or the core roller can linearly feed; the combined cover die comprises a cover die and a plurality of split dies which can be enclosed into a circle, the whole circle of split dies are detachably matched, inserted and installed on a conical surface of an inner ring of the cover die, an outer ring of the cover die is in contact with the driving roller and can be driven to rotate by the driving roller, the inner surface of the whole circle of split dies is matched with the outer surface of the special-shaped thin-wall casing ring forging, the outer surface of a working part of the core die is matched with the inner surface of the special-shaped thin-wall casing ring forging, the split dies have a structure for axially limiting a ring blank, and grooves matched with bosses of an outer island are formed in corresponding positions of the inner surface.
2. The rolling method of the special-shaped thin-walled casing ring forging with the island bosses of claim 1, wherein: the target size of each stage is determined according to the back-pushing of the special-shaped thin-wall case part with the external island boss, the size of the special-shaped thin-wall case ring forging with the external island boss is obtained according to the size of the special-shaped thin-wall case part with the external island boss and forging allowance on two sides, the external island boss of the special-shaped thin-wall case ring forging with the external island boss is removed, the volume sum of all the external island bosses is arranged on the inner surface of the corresponding height position by multiple times, the size of the special-shaped cross-section ring blank with the internal rotation boss is obtained according to the selected rolling ratio range and the principle that the axial cross-section is equal, the size of the thick-wall special-shaped cross-section ring blank is obtained according to the selected rolling ratio range and the principle that the axial cross-section are equal, the diameter of the punch is used as the inner diameter, the size of the ring blank with the nearly rectangular cross-section is determined according to the selected height ratio in equal proportion, and finally, determining the blanking volume according to the size of the ring blank with the approximately rectangular section.
3. The rolling method of the special-shaped thin-walled casing ring forging with island bosses as claimed in claim 1 or 2, wherein: the outer island boss is a cylinder, a triangular prism or a rectangular column.
4. The rolling method of the special-shaped thin-walled casing ring forging with the island bosses of the belt of claim 1 or 2, characterized by comprising the following steps: before finish rolling is started, the whole circle of split molds are axially placed into the inner ring of the sleeve mold and are tightly pressed, and after finish rolling is completed, the whole circle of split molds are pressed and removed from the opposite direction.
5. The rolling method of the special-shaped thin-walled casing ring forging with island bosses as claimed in claim 1 or 2, wherein: the conical angle between the split mold and the inner ring of the cover mold is 1-3 degrees.
6. The rolling method of the special-shaped thin-walled casing ring forging with the island bosses of the belt of claim 1 or 2, characterized by comprising the following steps: the number of the split molds is determined according to the number of the outer island bosses.
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| CN202110861755.0A CN113579130B (en) | 2021-07-29 | 2021-07-29 | Rolling method for special-shaped thin-wall casing ring forging with external island bosses |
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| CN202110861755.0A CN113579130B (en) | 2021-07-29 | 2021-07-29 | Rolling method for special-shaped thin-wall casing ring forging with external island bosses |
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| CN113579130B true CN113579130B (en) | 2022-07-22 |
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| JPH07275990A (en) * | 1994-04-01 | 1995-10-24 | Kotani:Kk | Method and device for manufacturing cylindrical parts with step |
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| CN106475443A (en) * | 2016-09-20 | 2017-03-08 | 西安交通大学 | A kind of precision corrector of aircraft engine casing |
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| CN112355208A (en) * | 2020-09-30 | 2021-02-12 | 贵州安大航空锻造有限责任公司 | Near-net rolling forming method of GH907 special-shaped ring forging |
| CN113084053A (en) * | 2021-03-25 | 2021-07-09 | 武汉理工大学 | Rolling extrusion composite near-net forming method for large inner contour abrupt cross-section ring piece |
| CN113084054A (en) * | 2021-03-25 | 2021-07-09 | 武汉理工大学 | Rolling and extruding composite near-net forming method for large-sized outer contour abrupt cross-section ring piece |
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2021
- 2021-07-29 CN CN202110861755.0A patent/CN113579130B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH07275990A (en) * | 1994-04-01 | 1995-10-24 | Kotani:Kk | Method and device for manufacturing cylindrical parts with step |
| EP2769781A1 (en) * | 2013-02-21 | 2014-08-27 | Aktiebolaget SKF | A cold rolling method for forming bearing rings |
| WO2016035664A1 (en) * | 2014-09-01 | 2016-03-10 | 日立金属Ｍｍｃスーパーアロイ株式会社 | Manufacturing method for ring formed body |
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