CN111250635A - Split type core roller structure capable of reducing speed difference of ring rolling surface of special-shaped ring piece - Google Patents
Split type core roller structure capable of reducing speed difference of ring rolling surface of special-shaped ring piece Download PDFInfo
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- CN111250635A CN111250635A CN202010063532.5A CN202010063532A CN111250635A CN 111250635 A CN111250635 A CN 111250635A CN 202010063532 A CN202010063532 A CN 202010063532A CN 111250635 A CN111250635 A CN 111250635A
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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
The invention discloses a split core roller structure capable of reducing the speed difference of the ring rolling surface of a special-shaped ring piece, which comprises a core shaft and annular core roller pieces, wherein the core shaft is of a step shaft structure with the diameter gradually increased from top to bottom and a smooth surface, and the height of each step on the core shaft is 0.2-0.5 mm greater than the axial length of the corresponding annular core roller piece according to the size of a workpiece, so that the phenomenon of dead pressing is avoided; the annular core roller sheet is divided into at least two sections, and the areas with larger diameter difference are separated according to the diameter of the core roller during the segmentation; the annular core roller sheets are assembled on the mandrel step by step in a sliding fit mode so as to ensure that each section of annular core roller sheet can rotate freely and is fixed from one end step by a fastening nut and a gasket. The invention has simple structure, and the split core roller is formed by the annular core roller sheets with different shapes, so that the preparation cost of the die can be reduced, the productivity is improved, the flow speed difference of surface materials during ring rolling of the ring is reduced, the surface materials can flow uniformly during ring rolling, and the generation of surface defects is reduced.
Description
Technical Field
The invention relates to the field of metal plastic forming, in particular to a split core roller structure capable of reducing the ring rolling surface speed difference of a special-shaped ring piece.
Background
The ring rolling process is a special forming process which utilizes a ring rolling mill to make a metal ring part generate local and continuous plastic deformation so as to realize the diameter expansion, the wall thickness reduction and the section profile forming of the ring part. Compared with the integral die forging forming process, the ring rolling has the advantages of low tonnage of required equipment, material saving, low production cost and the like, and is widely applied to the production of annular parts.
The ring rolling mill is a core device for realizing ring rolling forming, and the working parts of the ring rolling mill mainly comprise a driving roller, a core roller, a conical roller and a guide roller. And in the forming process, the driving roller is arranged on the outer side of the ring piece, the core roller is arranged on the inner side of the ring piece and close to the driving roller, the core roller and the driving roller form a radial roller pair during rolling, and the metal ring blank which is bitten between the radial roller pair is pressed and formed through the rotation of the driving roller and the radial feeding of the core roller. The guide roller and the conical roller mainly play roles in regulating the shape of the blank and axially pressing the blank.
Rectangular cross-section rings are the simplest, most common ring shapes. With the development of the technology, the ring members with various special-shaped cross sections are applied more and more. In the ring rolling process, the ring blank is driven by the driving roller, and all parts rotate at approximately equal angular speeds. For the ring piece with the regular shape and the rectangular cross section, the same tangential linear velocity is arranged at each point on the cylindrical surface of the inner side of the ring piece, and the tangential linear velocities at different positions can be matched with the tangential linear velocity on the surface of the core roller. However, for the ring with the special-shaped section, the tangential linear velocities of the ring are necessarily inconsistent under the same rotation angular velocity due to different radial sizes of different positions inside the ring; for the core roll, since the conventional core roll is generally designed as a whole, the angular velocity of rotation is the same at different positions thereof, and the linear velocity is different due to the difference in radial dimension at different positions of the surface of the core roll. In this case, the linear speed of the contact surface between the inner surface of the ring and the core roller is always mismatched. In actual production, the mismatch is usually corrected by a small amount of "slip" between the inner side of the ring and the contact surface of the core roller and abnormal deformation of the ring blank, but if the speed difference exceeds a certain range, the ring blank is subjected to a large uneven additional force, which may cause surface cracks, ring body distortion and other forming defects. Therefore, it is necessary to reduce the difference in tangential velocity between the inner surface of the ring blank and the surface of the core roll during ring rolling.
In the prior art, besides a conventional integral core roller, a special-shaped core roller is also designed by combining a plurality of roller sheets with different shapes and sizes, and the roller sheets are fastened on a shaft shoulder of a middle mandrel by a fastening nut from one end, so that the manufacturing cost of the core roller can be reduced. However, since all the roller sheets are connected with the intermediate mandrel by the key, and all the roller sheets are pressed together into a whole by the fastening nut, the parts (roller sheets) of the core roller synchronously rotate at the same angular speed as the common integral core roller, and the phenomenon that the tangential speed of the contact surface is not matched exists.
Disclosure of Invention
The invention aims to provide a split core roller structure capable of reducing the ring rolling surface speed difference of a special-shaped ring piece.
The technical scheme adopted for achieving the purpose of the invention is that the split core roller structure capable of reducing the ring rolling surface speed difference of the special-shaped ring piece comprises a core shaft, a fastening nut and a split core roller lantern ring.
The dabber is the step axle of vertical setting, from last to down, the diameter of dabber increases step by step. The core shaft is provided with a split core roller lantern ring, the split core roller lantern ring comprises N annular core roller sheets, and N is a positive integer greater than or equal to 2.
The segmentation principle of the annular core roller sheet is that areas with larger diameter difference are separated according to the size of the outer contour diameter of the core roller.
N annular core roller pieces are respectively arranged on the steps corresponding to the mandrel, and each annular core roller piece is in sliding fit with the mandrel.
And the upper end of the mandrel is screwed into a fastening nut, and the fastening nut axially fixes the annular mandrel roller sheet at the uppermost end.
When the automatic matching device works, the driving roller drives the ring blank to rotate, and the N annular core roller sheets are driven by the friction force of the inner surface of the ring blank to freely rotate at respective angular speeds, so that the linear speed of the inner surface of the ring blank is automatically matched.
Further, the outer surfaces of two adjacent annular core roller sheets are in smooth transition.
Further, the height of one step on the mandrel is recorded as H, the axial length of the annular mandrel piece corresponding to the step is H, H is greater than 0, H is greater than 0, and H-H is 0.2-0.5 mm according to the size of a workpiece.
Further, a gasket is arranged between the fastening nut and the uppermost annular core roller sheet.
The technical effect of the invention is undoubtedly that the split ring rolling core roller can enable the contact part of the inner surface of the ring blank and the core roller to be respectively and freely deformed and is not limited by the deformation of the integral core roller. The core roller is designed in a split mode, the number of the annular core roller sheets is increased, the speed matching degree of the core roller and the inner surface of the ring piece is increased, the flowing speed difference of the inner surface material of the ring piece is reduced, the flowing uniformity of the inner surface material of the ring piece is increased, and the generation of defects of the inner surface of the ring piece is reduced. Meanwhile, the invention has simple structure and low processing cost.
Drawings
FIG. 1 is a schematic structural diagram of a 3-segment core roll for ring rolling of a special-shaped ring piece;
FIG. 2 is a schematic structural view of a 5-segment core roll for ring rolling of the special-shaped ring piece;
FIG. 3 is a schematic view of the split core roller of the special-shaped ring rolling of the invention contacting with the inner surface of the ring blank;
FIG. 4 is a plot of material flow velocity differential versus time for a split core roll ring rolled piece obtained from finite element simulations;
FIG. 5 is a radial rolling force-time curve for a split core roll ring rolled product obtained from finite element simulations.
In the figure: the core shaft comprises a core shaft 1, a fastening nut 2, a gasket 3, a split core roller lantern ring 4 and a ring blank 5.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.
Example 1:
the embodiment discloses a split type core roller structure capable of reducing the speed difference of the ring rolling surface of a special-shaped ring piece, and the split type core roller structure comprises a mandrel 1, a fastening nut 2 and a split type core roller lantern ring 4.
Referring to fig. 1, the split core roll structure of the present embodiment is a 3-segment core roll structure.
Dabber 1 is the step axle of vertical setting, from last to down, the diameter of dabber 1 increases step by step, and the surface of dabber 1 is smooth. The core shaft 1 is provided with a split core roller lantern ring 4, the split core roller lantern ring 4 comprises three annular core roller sheets, and the three annular core roller sheets are close to each other end to end.
The three annular core roller sheets are respectively arranged on the corresponding steps of the mandrel 1, and each annular core roller sheet is in sliding fit with the mandrel 1. And the outer surfaces of two adjacent annular core roller sheets are in smooth transition.
The height of one of the steps on the mandrel 1 is recorded as H, the axial length of the annular core roller piece corresponding to the step is H, H is larger than 0, H is larger than 0, and H-H is 0.2-0.5 mm according to the size of a finished piece, so that the phenomenon of dead pressing between the annular core roller pieces is avoided, and each section of annular core roller piece can freely rotate around the mandrel 1 and is not mutually influenced.
Referring to fig. 1, the upper end of the mandrel 1 is screwed into a fastening nut 2, and the fastening nut 2 axially fixes the uppermost annular mandrel piece. And a gasket 3 is arranged between the fastening nut 2 and the uppermost annular core roller sheet.
Referring to fig. 3, in operation, the split core roller has the same rolling feeding mode as the integral core roller, the driving roller drives the ring blank 5 to rotate, and the three ring core roller sheets are driven by the friction force of the inner surface of the ring blank 5 to rotate freely at respective angular speeds, so that the linear speed of the inner surface of the ring blank 5 is matched automatically.
When the split core roller structure capable of reducing the speed difference of the ring rolling surface of the special-shaped ring piece is processed and used, the split core roller structure comprises the following steps:
1) the integral core roller structure is decomposed and designed into a split core roller structure: the split core roller structure is characterized in that the integral core roller structure is decomposed into three sections of annular core roller sheets which are arranged end to end, a mandrel 1 is arranged in the middle, and the mandrel is of a step shaft structure with gradually increased diameter from top to bottom and smooth surface;
2) assembling three sections of the annular core roller sheets and the mandrel 1 into a whole in a sliding fit mode, and then installing the whole on a corresponding position on a ring rolling mill;
3) carrying out ring rolling plastic deformation on the ring blank 5 by using a ring rolling machine in the step 2): referring to fig. 3, the plastic deformation process is carried out by the split core roller and other rollers together, and the split core roller formed by three sections of annular core roller sheets and the mandrel 1 which are connected end to end is contacted with the inner surface of the annular blank 5; under the driving of the friction force of the ring blank 5, each section of the ring-shaped core roller sheet of the split core roller can respectively rotate at different angular speeds so as to increase the speed matching degree of the ring blank 5 and the core roller 1; the ring blank 5 is subjected to plastic deformation to a target size in the radial feeding process of the split core roller;
4) carrying out subsequent treatment on the ring piece obtained in the step 3) to obtain a finished ring piece.
The split core roller structure of the embodiment is mainly used for reducing the surface speed difference of a ring rolling piece, and therefore theoretical analysis is conducted on the surface speed change of the ring piece. Since the ring blank 5 is rotated and formed by the friction force of the driving roller, the rotation speed of the ring blank 5 has a great relationship with the driving roller. Assuming no relative sliding between the ring blank 5 and the drive roller, see the speed reference point of fig. 3, at time T:
vA＝vdriving device(1)
In the formula, vAIs a speed reference point on the outer surface of the ring blank 5, corresponding to a speed point v on the drive rollerDriving device。
vDriving device＝RDriving device·ωDriving device(2)
In the formula, RDriving deviceFor driving a velocity point v on the rollerDriving deviceCorresponding drive roller radius, ωDriving deviceTo drive the roller angular velocity.
vA＝RA·ω (3)
In the formula, RAIs the outer surface velocity point v of the ringAThe corresponding ring radius, ω, is the angular velocity of the ring blank 5.
The angular velocity ω of the ring blank 5 can be derived from the equations (1) to (3):
knowing the angular velocity ω of the ring blank 5, the inner surface velocity v of the ring blank 5 can be obtainedB：
In the formula, RBIs the inner surface velocity point v of the ring blank 5BCorresponding ring radius.
The theoretical value of the flowing speed of the material on the inner surface of the ring during the rolling of the ring can be obtained by the formula (5), wherein delta v (v) is takenB-vC) As a reference value for the change in the flow velocity of the material inside the ring. The material flow speed of the inner surface of the ring piece during rolling of the integral core roller and the split core roller can be obtained through numerical simulation, the material flow speed and the theoretical speed of the inner surface of the ring piece are compared, the influence rule of the split core roller on the flow speed of the material of the inner surface of the ring piece is obtained, and the flowing uniformity condition of the material is further known.
The numerical simulation of the split core roll comprises the steps of:
a) as shown in fig. 1, a ring core roll sheet 4, a ring blank model and other roll models of a 3-segment core roll structure are established by using three-dimensional modeling software; the autorotation speed of the 3-segment core roller is related to the rotating speed of the ring piece and the feeding speed of the 3-segment core roller; the 3-segment core roller in the present embodiment is a rotary body structure as shown in fig. 1;
b) guiding the model in the step a) into finite element simulation software SIMUFACT, inputting material parameters of a ring blank 5, setting motion parameters of a driving roller and a split core roller, and driving the core roller to rotate by using the ring blank 5;
c) and outputting the reference point tangential linear velocity of the inner surface of the ring piece in the numerical simulation result, integrating to obtain a ring piece inner surface velocity difference-time curve, and outputting a ring piece radial rolling force-time curve.
As shown in fig. 4, the flow velocity difference versus time curve of the material obtained by the integral core-roll ring rolling and the 3-segment core-roll ring rolling obtained by finite element simulation is obtained.
As shown in fig. 5, the radial rolling force-time curve is obtained by the integral core-roll ring rolling and the 3-segment core-roll ring rolling obtained by finite element simulation.
Referring to fig. 4, finite element simulation results show that the difference of the material flow velocity of the inner surface of the ring in the 3-segment core roll ring rolling is smaller than that in the integral core roll rolling, and is close to or even lower than the theoretical velocity difference. Referring to fig. 5, the radial rolling force of the ring prepared by ring rolling of the 3-segment core roller is slightly increased relative to that of the integral core roller.
The above data results demonstrate that: when the ring is prepared by the 3-segment core roller, the radial rolling force is basically unchanged, and the flow velocity difference of the surface material in the ring is reduced, so that the uniform flow of the material on the inner surface of the ring is facilitated, and the forming defect of the inner surface is reduced.
Example 2:
the embodiment discloses a split type core roller structure capable of reducing the speed difference of the ring rolling surface of a special-shaped ring piece, and the split type core roller structure comprises a mandrel 1, a fastening nut 2 and a split type core roller lantern ring 4.
Referring to fig. 2, the split core roll structure of the present embodiment is a 5-segment core roll structure.
Five annular core roller pieces are respectively arranged on the corresponding steps of the mandrel 1, and each annular core roller piece is in sliding fit with the mandrel 1.
Referring to fig. 2, the upper end of the mandrel 1 is screwed into a fastening nut 2, and the fastening nut 2 axially fixes the uppermost annular mandrel piece.
When the automatic matching device works, the driving roller drives the ring blank 5 to rotate, and the five annular core roller sheets are driven by the friction force of the inner surface of the ring blank 5 to freely rotate at respective angular speeds, so that the linear speed of the inner surface of the ring blank 5 is automatically matched.
When the split core roller structure capable of reducing the speed difference of the ring rolling surface of the special-shaped ring piece is processed and used, the split core roller structure comprises the following steps:
1) the integral core roller structure is decomposed and designed into a split core roller structure: the split core roller structure is characterized in that the integral core roller structure is divided into five annular core roller sheets which are arranged end to end, a mandrel 1 is arranged in the middle, and the mandrel is of a step shaft structure with gradually increased diameter from top to bottom and smooth surface;
2) assembling five sections of the annular core roller sheets and the mandrel 1 into a whole in a sliding fit mode, and then installing the whole on a corresponding position on a ring rolling mill;
3) carrying out ring rolling plastic deformation on the ring blank 5 by using a ring rolling machine in the step 2): the plastic deformation process is carried out through the split core roller and other rollers together, and the split core roller formed by five sections of annular core roller sheets which are arranged end to end and the mandrel 1 is contacted with the inner surface of the annular blank 5; under the driving of the friction force of the ring blank 5, each section of the ring-shaped core roller sheet of the split core roller can respectively rotate at different angular speeds so as to increase the speed matching degree of the ring blank 5 and the core roller 1; the ring blank 5 is subjected to plastic deformation to a target size in the radial feeding process of the split core roller;
4) carrying out subsequent treatment on the ring piece obtained in the step 3) to obtain a finished ring piece.
The effect of the structure of the invention is verified by the following test steps:
a) as shown in fig. 2, a ring core roll sheet 4, a ring blank model and other roll models of a 5-segment core roll structure are established by using three-dimensional modeling software; the autorotation speed of the 5-segment core roller is related to the rotating speed of the ring piece and the feeding speed of the 5-segment core roller; the 5-segment core roller in the present embodiment is a rotary body structure as shown in fig. 2;
b) guiding the model in the step a) into finite element simulation software SIMUFACT, inputting material parameters of a ring blank 5, setting motion parameters of a driving roller and a split core roller, and driving the core roller to rotate by using the ring blank 5;
c) and outputting the reference point tangential linear velocity of the inner surface of the ring piece in the numerical simulation result, integrating to obtain a ring piece inner surface velocity difference-time curve, and outputting a ring piece radial rolling force-time curve.
As shown in fig. 4, the flow velocity difference versus time curve of the material obtained by the integral core-roll ring rolling and the 5-segment core-roll ring rolling obtained by finite element simulation is obtained.
As shown in fig. 5, the radial rolling force-time curve is obtained by the integral core-roll ring rolling and the 5-segment core-roll ring rolling obtained by finite element simulation.
Referring to fig. 4, finite element simulation results show that the difference of the material flow velocity of the inner surface of the ring in the 5-segment core roll ring rolling is smaller than that in the integral core roll rolling, and is close to or even lower than the theoretical velocity difference. Referring to fig. 5, the radial rolling force of the ring prepared by ring rolling of the 5-segment core roller is slightly increased relative to that of the integral core roller.
The above data results demonstrate that: when the 5-segment core roller is used for preparing the ring, the radial rolling force is basically unchanged, and the flow velocity difference of the surface material in the ring is reduced, so that the uniform flow of the material on the inner surface of the ring is facilitated, and the forming defect of the inner surface is reduced.
Example 3:
the main structure of the present embodiment is the same as that of embodiment 2, and further, referring to fig. 2, the outer surfaces of two adjacent ring-shaped core roll sheets are smoothly transited.
Example 4:
the main structure of this embodiment is the same as that of embodiment 3, further, the height of one of the steps on the mandrel 1 is recorded as H, the axial length of the annular core roller piece corresponding to the step is H, H is greater than 0, and H-H is 0.5mm, so that the phenomenon of die-pressing between the annular core roller pieces is avoided, and each section of annular core roller piece can freely rotate around the mandrel 1 without mutual influence.
Example 5:
the main structure of this embodiment is the same as that of embodiment 4, and further, referring to fig. 2, a spacer 3 is provided between the fastening nut 2 and the uppermost annular core roll.
Claims (4)
1. Can reduce special-shaped ring rolling surface speed difference's split type core roller structure, its characterized in that: comprises the mandrel (1), a fastening nut (2) and a split type mandrel lantern ring (4);
the mandrel (1) is a step shaft which is vertically arranged, and the diameter of the mandrel (1) is gradually increased from top to bottom; the core shaft (1) is provided with a split core roller lantern ring (4), the split core roller lantern ring (4) comprises N annular core roller sheets, and N is a positive integer greater than or equal to 2;
the N annular core roller sheets are respectively arranged on the corresponding steps of the mandrel (1), and each annular core roller sheet is in sliding fit with the mandrel (1);
the upper end of the mandrel (1) is screwed into a fastening nut (2), and the fastening nut (2) axially fixes the annular mandrel piece at the uppermost end;
when the automatic matching device works, the driving roller drives the ring blank (5) to rotate, and the N annular core roller sheets freely rotate at respective angular speed under the driving of the friction force of the inner surface of the ring blank (5), so that the linear speed of the inner surface of the ring blank (5) is automatically matched.
2. The split core roller structure capable of reducing the ring rolling surface speed difference of the special-shaped ring piece as claimed in claim 1, wherein: and the outer surfaces of two adjacent annular core roller sheets are in smooth transition.
3. The split core roll structure capable of reducing the ring rolling surface speed difference of the special-shaped ring piece according to claim 1 or 2, wherein: the height of one of the steps on the mandrel (1) is recorded as H, the axial length of the annular mandrel sheet corresponding to the step is H, H is greater than 0, H is greater than 0, and H-H is 0.2-0.5 mm according to the size of a workpiece.
4. The split core roll structure capable of reducing the ring rolling surface speed difference of the special-shaped ring piece according to claim 1 or 3, wherein: and a gasket (3) is arranged between the fastening nut (2) and the uppermost annular core roller sheet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010063532.5A CN111250635A (en) | 2020-01-20 | 2020-01-20 | Split type core roller structure capable of reducing speed difference of ring rolling surface of special-shaped ring piece |
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| CN202010063532.5A CN111250635A (en) | 2020-01-20 | 2020-01-20 | Split type core roller structure capable of reducing speed difference of ring rolling surface of special-shaped ring piece |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114178802A (en) * | 2021-11-18 | 2022-03-15 | 太原重工轨道交通设备有限公司 | Manufacturing method of large axle wedge cross rolling die |
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| CN201768741U (en) * | 2010-09-10 | 2011-03-23 | 武汉钢铁(集团)公司 | Synchronous roller capable of reducing speed difference of sidewall of pass |
| CN102240761A (en) * | 2011-05-23 | 2011-11-16 | 无锡神意环件法兰有限公司 | Combined core roller for ring rolling machine |
| CN104014591A (en) * | 2014-06-11 | 2014-09-03 | 山东鸿民轧辊模具有限公司 | Roller floating rotor wing device |
| CN205085152U (en) * | 2015-10-20 | 2016-03-16 | 中冶赛迪工程技术股份有限公司 | Combined roller |
| CN208600643U (en) * | 2018-07-27 | 2019-03-15 | 安徽博斯特科技有限公司 | A kind of expansion stone roller molding die of wheel rim |
| CN109550820A (en) * | 2017-09-27 | 2019-04-02 | 中国商用飞机有限责任公司 | For manufacturing molding die, manufacturing equipment and the manufacturing method of roll bending part |
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2020
- 2020-01-20 CN CN202010063532.5A patent/CN111250635A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5376953A (en) * | 1976-12-20 | 1978-07-07 | Mitsubishi Metal Corp | Rouing roll |
| CN201768741U (en) * | 2010-09-10 | 2011-03-23 | 武汉钢铁(集团)公司 | Synchronous roller capable of reducing speed difference of sidewall of pass |
| CN102240761A (en) * | 2011-05-23 | 2011-11-16 | 无锡神意环件法兰有限公司 | Combined core roller for ring rolling machine |
| CN104014591A (en) * | 2014-06-11 | 2014-09-03 | 山东鸿民轧辊模具有限公司 | Roller floating rotor wing device |
| CN205085152U (en) * | 2015-10-20 | 2016-03-16 | 中冶赛迪工程技术股份有限公司 | Combined roller |
| CN109550820A (en) * | 2017-09-27 | 2019-04-02 | 中国商用飞机有限责任公司 | For manufacturing molding die, manufacturing equipment and the manufacturing method of roll bending part |
| CN208600643U (en) * | 2018-07-27 | 2019-03-15 | 安徽博斯特科技有限公司 | A kind of expansion stone roller molding die of wheel rim |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114178802A (en) * | 2021-11-18 | 2022-03-15 | 太原重工轨道交通设备有限公司 | Manufacturing method of large axle wedge cross rolling die |
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Application publication date: 20200609 |