CN112453293B - Rolling method of special-shaped ring with L-shaped section - Google Patents
Rolling method of special-shaped ring with L-shaped section Download PDFInfo
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- CN112453293B CN112453293B CN202011219084.XA CN202011219084A CN112453293B CN 112453293 B CN112453293 B CN 112453293B CN 202011219084 A CN202011219084 A CN 202011219084A CN 112453293 B CN112453293 B CN 112453293B
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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
Abstract
A method of rolling a profiled ring with an L-shaped cross-section, comprising: step A, preparing an annular blank with a non-equal height, and step B, preparing the annular blank into the L-shaped section special-shaped ring by utilizing a radial-axial ring rolling machine through a rolling process. The rolling method of the L-shaped section special-shaped ring provided by the invention finds out a specific mathematical relationship by analyzing the axial flow rule of metal in the rolling process, so that the defect-free L-shaped section special-shaped ring can be obtained by utilizing non-equal-height annular blanks under the bidirectional rolling of a radial-axial ring rolling machine. The problems of utilization of equal-height blanks in the prior art in the background art are effectively solved, and meanwhile, the production efficiency and the yield are greatly improved.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a rolling method of an L-shaped section special-shaped ring.
Background
FIG. 1 is a schematic view of a rolling process of a conventional special-shaped ring part with an L-shaped cross section; referring to fig. 1, the overall height of the final ring is H1, and the final ring includes a step a "and a cylindrical portion B", the outer diameter of the step a "is D3, the inner diameter of the inner hole is D2, the height of the step a is H2, and the outer diameter of the cylindrical portion B" is D1, and in the existing process for rolling the special-shaped ring part with the L-shaped cross section, two kinds of initial blanks are mainly used:
firstly, forming a rectangular section initial blank with the same height as the final special-shaped ring piece;
and the initial blank with the special-shaped section is equal to the final special-shaped ring piece in height.
For the initial blanks with the equal-height rectangular cross sections, the cross sectional areas of the initial blanks along the axial direction are equal, and the distribution of the cross sectional areas of the final rings along the axial direction is different (namely, the axial cross sectional area at the position of the final ring A 'is larger than the axial cross sectional area at the position of the final ring B' in fig. 1), which means that when the initial blanks with the equal-height rectangular cross sections are adopted to roll the special-shaped ring with the L-shaped cross section, metal at the position of the initial blank with the equal-height rectangular cross sections needs to flow into the part A along the axial direction in the rolling process, so that the part A of the final ring can be fully filled when the rolling is finished. However, in the actual rolling process, the main flowing direction of the metal is the circumferential direction, the axial flowing amount is small, and if the axial cross-sectional area of the final ring piece A ' is greatly different from the axial cross-sectional area of the final ring piece B ', the ring piece A ' is difficult to fill when the rolling is finished, so that only the special-shaped ring piece with a simpler shape can be rolled by adopting the initial blank with the rectangular cross section with the same height.
For the initial blank with the equal-height special-shaped section, metal is axially distributed during blank manufacturing so as to be matched with the axial cross-sectional area of the final ring piece, and therefore the forming requirement of the complex special-shaped ring piece is met. However, the process method required for forming the initial blank with the special-shaped section is complex, the tonnage of equipment is large, the cost is very high, and the process method is difficult to popularize and apply under the domestic existing conditions.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a rolling method for a special-shaped ring with an L-shaped cross section, so as to reduce or avoid the aforementioned problems.
In order to solve the technical problem, the invention provides a rolling method of an L-shaped section special-shaped ring, the overall height of a final ring piece of the L-shaped section special-shaped ring is H1, the volume of the final ring piece is V1, the final ring piece comprises a step part A 'and a cylindrical part B', the outer circle diameter of the step part A 'is D3, the inner hole diameter is D2, the height of the step part A' is H2, the outer circle diameter of the cylindrical part B 'is D1, the wall thickness of the cylindrical part B' is B1, and B1 is (D1-D2)/2. It includes:
step A, preparing an annular blank, wherein the volume V2 of the annular blank is equal to the volume V1 of the L-shaped section special-shaped ring, the outer diameter of the annular blank is D4, the inner diameter of the annular blank is D5, the height of the annular blank is H3, the wall thickness of the annular blank is B2, and B2 is (D4-D5)/2 ═ of (D4-D5)
The inner diameter D5 of the annular blank and the diameter D of a core roller of the radial-axial ring rolling machine need to satisfy the following relation, D5 is D + (20-30 mm).
The thickness B2 of the annular blank and the thickness B1 of the cylindrical portion B ″ need to satisfy the following relationship, where B2 is (1.6 to 2.0) · B1.
The volume V3 of the part for forming the step part A 'in the annular blank and the volume V4 of the step part A' need to satisfy the following relation, wherein V3 is (1.1-1.5). V4.
And B, preparing the annular blank into the L-shaped section special-shaped ring by utilizing a radial-axial ring rolling machine through a rolling process.
Preferably, in step a, the volume of the portion of the annular blank for forming the step a ″
Preferably, in step a, the annular blank is prepared by upsetting, punching and reaming a cylindrical blank obtained by cutting out a bar.
Preferably, in the step A, the diameter D and the height H of the columnar blank satisfy the following relation, H is (1.5-2). D,
the volume of the cylindrical blank and the volume V2 of the annular blank and the volume V0 of the punched bottom sheet satisfy the following relationship,
in the above formula, α is a material burnout rate.
Preferably, in step A, α is taken to be 1.01 to 1.04.
Preferably, in step a, the height of the cylindrical blank is kept the same as that of the annular blank during upsetting and punching, and the diameter D0 and the thickness H0 of the punched bottom sheet removed during punching satisfy the following formulas,
volume of the punched base sheet
The rolling method of the L-shaped section special-shaped ring provided by the invention finds out a specific mathematical relationship by analyzing the axial flow rule of metal in the rolling process, so that the defect-free L-shaped section special-shaped ring can be obtained by utilizing non-equal-height annular blanks under the bidirectional rolling of a radial-axial ring rolling machine. The problems of utilization of equal-height blanks in the prior art in the background art are effectively solved, and meanwhile, the production efficiency and the yield are greatly improved.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein the content of the first and second substances,
FIG. 1 is a schematic view of a rolling process of a conventional special-shaped ring part with an L-shaped cross section;
fig. 2 is a schematic process flow diagram of a rolling method of an L-section profiled ring according to an embodiment of the present invention.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.
Fig. 2 is a schematic process flow diagram of a rolling method of an L-section profiled ring according to an embodiment of the present invention. Referring to fig. 2, the invention provides a rolling method of an L-shaped section special-shaped ring, which prepares a non-equal-height blank, and prepares the L-shaped section special-shaped ring through a radial-axial ring rolling machine, wherein the final ring piece of the L-shaped section special-shaped ring 300 has the overall height of H1 and the volume of V1, and comprises a step portion a "and a cylindrical portion B", the outer circle diameter of the step portion a "is D3, the inner hole diameter is D2, the height of the step portion is H2, the outer circle diameter of the cylindrical portion B" is D1, the wall thickness of the cylindrical portion B "is B1, and B1 is (D1-D2)/2. It includes:
step A, preparing an annular blank 200, wherein the volume V2 of the annular blank 200 is equal to the volume V1 of the L-shaped section special-shaped ring 300, the outer diameter of the annular blank 200 is D4, the inner diameter of the annular blank 200 is D5, the height of the annular blank 200 is H3, the wall thickness of the annular blank 200 is B2, and B2 is (D4-D5)/2
The inner diameter D5 of the annular blank 200 and the diameter D of a core roll of the radial-axial ring rolling machine need to satisfy the following relation, D5 is D + (20-30 mm).
The thickness B2 of the annular blank 200 and the thickness B1 of the cylindrical portion B ″ need to satisfy the following relationship, where B2 is (1.6 to 2.0) · B1.
The volume V3 of the portion of the annular blank 200 for forming the step a ″ and the volume V4 of the step a ″ should satisfy the following relationship, where V3 is (1.1 to 1.5) · V4.
And step B, preparing the annular blank 200 into the L-shaped section special-shaped ring 300 by utilizing a radial-axial ring rolling machine through a rolling process.
The core of the present invention is to prepare the annular blank 200 with a specific size that is not equal to the final L-shaped section special-shaped ring 300, and then prepare the annular blank 200 into the L-shaped section special-shaped ring 300 by a rolling process using a radial-axial ring rolling machine, so as to ensure that the step a ″ can be filled with metal without defects, and therefore, the size of the annular blank 200 must be specifically limited.
For the sake of convenience in describing the dimensional relationship between the annular blank 200 and the L-section profiled ring 300, the aforementioned parameters are further specified as follows:
the volume V1 of the L-section profiled ring 300 can be obtained as follows,
the volume V2 of the ring-shaped blank 200 can be obtained as follows,
the volume V1 of the L-section profiled ring 300 is equal to the volume V2 of the annular blank 200. That is, V1 ═ V2 is satisfied.
The volume of the portion of the annular blank 200 intended to form the step a "(i.e. the portion corresponding to (H1-H2) of the L-section profiled ring 300) V3 can be obtained as follows,
the volume V4 of the step a "of the L-section profiled ring 300 can be obtained as follows,
the present invention prepares the annular blank 200 into the L-shaped cross-section profiled ring 300 by a rolling process using a radial-axial ring rolling machine. The inside diameter D5 of the ring blank 200 needs to be related to the core roll diameter D of the radial-axial ring rolling machine, and specifically, the following relationship is satisfied,
D5＝d+(20～30mm)。
further, the wall thickness B2 of the annular blank 200 and the wall thickness B1 of the cylindrical portion B' satisfy the following relationship,
B2＝(1.6～2.0)·B1。
in order to ensure a sufficient amount of axially flowing metal during rolling, the volume V3 of the portion of the annular blank 200 for forming the step a ″ and the volume V4 of the step a ″ should satisfy the relationship that V3 is (1.1 to 1.5) · V4
With the above definitions, the values of the outer diameter D4 and the height H3 of the annular blank 200 can be easily calculated and determined, so that the specific parameter values of the annular blank 200 can be obtained.
The inventor proves through practice that the finally prepared L-shaped section special-shaped ring 300 can meet the product requirements under the bidirectional rolling (radial and axial) of the existing common radial-axial ring rolling machine as long as the parameters of the annular blank 200 can meet the requirements, and has no insufficient defects. Thereby overcoming the problems associated with the use of high profile blanks of the prior art.
The ring-shaped blank 200 may be prepared by upsetting, punching, and reaming the cylindrical blank 100 obtained by cutting out a bar, and in particular,
the height of the cylindrical blank 100 is kept the same as that of the annular blank 200 during upsetting and punching, and the punching bottom sheet removed during punching, the diameter D0 and the thickness H0 satisfy the following formula,
volume of the punched base sheet
The diameter D and the height H of the columnar blank 100 satisfy the following relationship, H ═ 1.5-2. D,
the volume of the cylindrical blank 100 and the volume V2 of the ring blank 200 and the volume V0 of the bottom punched sheet satisfy the following relationship,
in the above formula, alpha is the burning loss rate of the material, and is determined according to the material grade and the fire number, and is generally 1.01-1.04
The rolling method of the L-shaped section special-shaped ring provided by the invention finds out a specific mathematical relationship by analyzing the axial flow rule of metal in the rolling process, so that the defect-free L-shaped section special-shaped ring can be obtained by utilizing non-equal-height annular blanks under the bidirectional rolling of a radial-axial ring rolling machine. The problems existing in the prior art of utilizing equal-height blanks in the background technology are effectively solved, and meanwhile, the production efficiency and the yield are greatly improved.
It should be appreciated by those of skill in the art that while the present invention has been described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including technical equivalents which are related to the embodiments and which are combined with each other to illustrate the scope of the present invention.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention shall fall within the scope of the invention.
Claims (6)
1. A rolling method of an L-shaped cross-section special-shaped ring, the final ring member of the L-shaped cross-section special-shaped ring has an overall height of H1, a volume of V1, and comprises a step portion a "and a cylindrical portion B", the step portion a "has an outer circle diameter of D3, an inner hole diameter of D2, a height of H2, the cylindrical portion B" has an outer circle diameter of D1, the cylindrical portion B "has a wall thickness of B1, and B1 ═ 2 (D1-D2)/2, and the rolling method is characterized by comprising:
step A, preparing an annular blank, wherein the volume V2 of the annular blank is equal to the volume V1 of the L-shaped section special-shaped ring, the outer diameter of the annular blank is D4, the inner diameter of the annular blank is D5, the height of the annular blank is H3, the wall thickness of the annular blank is B2, and B2 is (D4-D5)/2
The inner diameter D5 of the annular blank and the diameter D of a core roller of the radial-axial ring rolling machine need to satisfy the following relation, D5 is D + (20-30 mm),
the thickness B2 of the annular blank and the thickness B1 of the cylindrical part B' satisfy the following relationship, B2 is (1.6-2.0). B1,
the volume V3 of the part for forming the step part A 'in the annular blank and the volume V4 of the step part A' satisfy the following relationship, wherein V3 is (1.1-1.5). V4,
and B, preparing the annular blank into the L-shaped section special-shaped ring by utilizing a radial-axial ring rolling machine through a rolling process.
2. Method according to claim 1, characterized in that in step a, the volume of the portion of the annular blank intended to form the step a ″
3. The method according to claim 1, wherein in step a, the annular blank is prepared by upsetting, punching and reaming a cylindrical blank obtained by cutting out a bar.
4. The method according to claim 3, wherein in step A, the diameter D and the height H of the columnar blank satisfy the following relationship, H ═ D (1.5-2) · D,
the volume of the cylindrical blank and the volume V2 of the annular blank and the volume V0 of the punched bottom sheet satisfy the following relationship,
in the above formula, α is a material burnout rate.
5. The method according to claim 4, wherein in step A, α is 1.01 to 1.04.
6. The method as claimed in claim 3, wherein in step A, the height of the cylindrical blank is kept the same as that of the annular blank during upsetting and punching, and the diameter D0 and the thickness H0 of the punched bottom sheet removed during punching satisfy the following formulas,
volume of the punched base sheet
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| CN109977561A (en) * | 2019-03-29 | 2019-07-05 | 太原科技大学 | A kind of design method of asymmetric double step ring rolling blank dimension |
| CN110666081A (en) * | 2019-10-09 | 2020-01-10 | 北京北方车辆集团有限公司 | Rolling method of alloy steel special-shaped ring piece with section containing abrupt change curve |
| CN111331063A (en) * | 2020-03-31 | 2020-06-26 | 武汉理工大学 | Low-consumption high-performance near-net cold rolling forming method for complex gear blank ring piece |
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2020
- 2020-11-04 CN CN202011219084.XA patent/CN112453293B/en active Active
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| RU2185914C2 (en) * | 1999-06-29 | 2002-07-27 | Процив Юрий Васильевич | Method for making annular articles |
| CN1586754A (en) * | 2004-09-21 | 2005-03-02 | 武汉理工大学 | Process for rolling and forming external step section ring piece |
| KR20130092861A (en) * | 2012-02-13 | 2013-08-21 | 주식회사 평산 | A method for production of flange for wind tower |
| CN102601278A (en) * | 2012-03-20 | 2012-07-25 | 武汉理工大学 | Method for radially and axially rolling and forming large-sized double-edge stepped ring parts |
| CN102873511A (en) * | 2012-09-29 | 2013-01-16 | 山东建筑大学 | Method for radially rolling and forming ring piece with three steps and complicated section |
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