CN112163357B - Flexible growth forming method for thin-wall polygonal ring member - Google Patents

Flexible growth forming method for thin-wall polygonal ring member Download PDF

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CN112163357B
CN112163357B CN202011067446.8A CN202011067446A CN112163357B CN 112163357 B CN112163357 B CN 112163357B CN 202011067446 A CN202011067446 A CN 202011067446A CN 112163357 B CN112163357 B CN 112163357B
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core roller
ring
polygonal ring
shaped member
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韩星会
华林
庄武豪
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Wuhan University of Technology WUT
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Abstract

The invention relates to a flexible growth forming method of a thin-wall polygonal ring-shaped member, which comprises the following steps: s1, assembling a restraint die, an annular blank, a driving core roller and an ejection ring; s2, driving the core roller to make multi-pass polygonal feeding motion on the inner surface of the annular blank: firstly, driving a core roller to move from an initial central position to a position corresponding to a corner of the inner surface of a constraint mould, then driving the core roller to feed to a first-pass feeding amount position along the radial direction, and moving for a circle according to the polygonal contour of the inner surface of a target polygonal ring-shaped member; then, the core roller is driven to be fed to a second-pass feeding amount position in the radial direction, and moves for a circle according to the polygonal contour of the inner surface of the target polygonal ring-shaped member; driving the core roller to repeat the feeding path until a target polygonal ring-like member is obtained; and S3, after the forming is finished, the ejection ring pushes the target polygonal ring-shaped member to separate from the constraint die. The invention effectively solves the manufacturing problems of high performance, high efficiency and low cost of the large thin-wall complex annular component.

Description

Flexible growth forming method for thin-wall polygonal ring member
Technical Field
The invention relates to the field of forming and manufacturing of thin-wall polygonal ring members, in particular to a flexible growth forming method of a thin-wall polygonal ring member.
Background
The thin-wall polygonal ring member has very wide application in the fields of aviation, aerospace, ships, weaponry, wind power, petrochemical industry and the like, and the manufacturing technology of the thin-wall polygonal ring member is the leading edge of the research on the manufacturing technology of international high-end equipment. The thin-wall polygonal ring member has not only a thin wall thickness but also a complicated polygonal axial section, so that the member cannot be manufactured by a conventional ring rolling method. At present, the main processing methods of the components are cutting processing and welding. The cutting processing method is to cut a large amount of redundant metal on the basis of a thick-wall ring blank to obtain a thin-wall polygonal ring member, and the method has the advantages of low material utilization rate, low efficiency and high cost, and cannot refine grains and cut off metal flow lines, so that the high-performance thin-wall polygonal ring member is difficult to manufacture. The welding method is to weld a plurality of thin plate members into a thin-wall polygonal ring member by adopting a welding technology, and the method seriously weakens the strength and the bearing capacity of the thin-wall polygonal ring member. Therefore, the existing processing methods are difficult to realize the high-performance, high-efficiency and low-cost manufacture of the thin-wall polygonal ring member.
Disclosure of Invention
The invention aims to solve the technical problem that a flexible growth forming method of a thin-wall polygonal ring effectively solves the manufacturing problems of high performance, high efficiency and low cost of a large thin-wall complex ring-shaped component.
The technical scheme adopted by the invention for solving the technical problems is as follows: a flexible growth forming method for a thin-wall polygonal ring-shaped member is constructed, and comprises the following steps:
s1, assembling a thin-wall polygonal ring-shaped member flexible growth forming device, wherein the thin-wall polygonal ring-shaped member flexible growth forming device comprises a restraint die, an annular blank, a driving core roller and an ejection ring; the annular blank is placed in the restraint die, and the outer surface of the annular blank is tangent to the inner surface of the restraint die; the driving core roller is arranged in the annular blank, and the axis of the driving core roller is parallel to the axis of the annular blank; the ejection ring is positioned on the lower end face of the annular blank and is attached to the inner surface of the restraint die; the restraint die is an annular component, and the shape of the inner surface of the restraint die is completely consistent with that of the outer surface of the target polygonal ring-shaped component; the restraint die is fixed on the base and is kept fixed in the forming process; the driving core roller is a solid rod, the shape of the outer surface of the driving core roller is matched with that of the inner surface of the target polygonal ring-shaped member, and the diameter of the driving core roller is not larger than that of a corner circular arc of the inner surface of the target polygonal ring-shaped member; the outer surface of the ejection ring is polygonal, and the outline of the outer surface of the ejection ring is slightly smaller than that of the target polygonal ring-shaped member; the inner surface of the ejection ring is annular, and the inner diameter of the ejection ring is slightly smaller than the diameter of an inscribed circle of the inner surface of the target polygonal ring component;
s2, driving the core roller to do multi-pass polygonal feeding motion on the inner surface of the annular blank: firstly, driving a core roller to move from an initial central position to a position corresponding to a corner of the inner surface of a constraint mould and attach to the inner surface of an annular blank, then driving the core roller to feed to a first-pass feeding amount position along the radial direction, and moving for a circle according to the polygonal contour of the inner surface of a target polygonal ring-shaped member; then, the core roller is driven to be fed to a second-pass feeding amount position in the radial direction, and moves for a circle according to the polygonal contour of the inner surface of the target polygonal ring-shaped member; driving the core roller to repeat the feeding path until a target polygonal ring-like member is obtained;
the driving core roller passively rotates around the axis of the driving core roller in the forming process, and simultaneously performs feed motion on the inner surface of the annular blank along a preset path; through the combined action of the restraint die and the driving core roller, the metal of the annular blank mainly flows along the circumferential direction, the circumference of the annular blank is continuously expanded, the section outline is continuously formed, and the axial height is basically unchanged; when the outer surface of the annular blank is completely attached to the inner surface of the restraint mold, the core roller is driven to continue feeding, the perimeter of the outer surface of the annular blank is kept unchanged, and the axial height is continuously increased;
and S3, after the forming is finished, the ejection ring in the constraint die pushes the target polygonal ring-shaped member to move upwards until the target polygonal ring-shaped member is separated from the constraint die.
In the scheme, the geometric dimension of the annular blank is calculated according to a formula (1);
Figure BDA0002714198630000021
wherein H0Is the annular blank height, D0Is the diameter of the outer circle of the annular blank, d0The diameter of the inner circle of the annular blank; h is the height of the target polygonal ring member, D is the diameter of an inscribed circle on the outer surface of the target polygonal ring member, and D is the diameter of an inscribed circle on the inner surface of the target polygonal ring member; r is a radical of hydrogen1Is the radius of the corner arc of the outer surface of the target polygonal ring-shaped member r2The radius of the arc of the inner surface corner of the target polygonal ring-shaped member is shown, and lambda is the axial height growth rate.
In the above scheme, in the step S2, when the shortest distance between the driving core roller and the inner surface of the constraining mold is greater than S0When the shortest distance between the driving core roller and the inner surface of the constraint mould is less than S0In time, the feeding amount of each pass of the driving core roller is larger, S0Calculating according to the formula (2);
Figure BDA0002714198630000031
wherein r is0Is the core roll radius.
The implementation of the flexible growth forming method of the thin-wall polygonal ring-shaped member has the following beneficial effects:
(1) the flexible growth forming method of the thin-wall polygonal ring-shaped member realizes the forming and manufacturing of the polygonal ring-shaped member; the method has the advantages of high material utilization rate, high production efficiency and the like;
(2) the thin-wall polygonal ring member can be subjected to repeated continuous rolling to refine structure grains and obtain a good metal streamline, so that the mechanical property of the member is remarkably improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a front view of a thin-walled polygonal ring-like member and an annular blank;
figure 2 is a cross-sectional view of the thin-walled polygonal ring-like member and the ring-shaped blank;
FIG. 3 is a schematic view of a flexible growth forming apparatus for forming a thin-walled polygonal ring-like member;
FIG. 4 is a schematic view of a flexible growth forming die for a thin-walled polygonal ring-like member;
FIG. 5 is a front view of the flexible growth forming process of the thin-walled polygonal ring-like member;
figure 6 is a cross-sectional view of the process of flexible growth forming of the thin-walled polygonal ring-like members;
FIG. 7 is a schematic diagram of finite element simulation during the flexible growth forming process of the thin-walled polygonal ring-like member;
figure 8 is a schematic view of the feed path of the drive core roller for flexible growth forming of the thin-walled polygonal ring-like members;
FIG. 9 is a schematic view of a thin-walled polygonal ring-like member compliant growth forming ejector ring;
figure 10 is a schematic illustration of a flexible growth forming die release of a thin-walled polygonal ring-like member.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The target thin-walled polygonal ring member of this example is shown in fig. 1, which is a hexagonal ring member having the major dimensional parameters shown in table 1. The blank used in this example is an annular blank 2, as shown in figure 1. The geometric dimensions of the annular blank 2 are calculated according to the formula (1), and the main dimensional parameters are shown in the table 1.
Figure BDA0002714198630000041
Wherein H0For annular blank 2 height, D0Is the diameter of the outer circle of the annular blank 2, d0The diameter of the inner circle of the annular blank 2 is set; h is the height of the target polygonal ring member, D is the diameter of an inscribed circle on the outer surface of the target polygonal ring member, and D is the diameter of an inscribed circle on the inner surface of the target polygonal ring member; r is1Is the radius of the corner arc of the outer surface of the target polygonal ring-shaped member r2And (3) taking the radius of the arc of the inner surface corner of the target polygonal ring member, wherein lambda is the axial height growth rate, and the lambda is 1.09.
TABLE 1 Flexible growth shaping finite element model parameters for hexagonal thin-walled ring structure
Figure BDA0002714198630000042
The flexible growth forming device for assembling the thin-wall polygonal ring-shaped member comprises a restraint die 4, an annular blank 2, a driving core roller 1 and an ejection ring 3, and is shown in figure 3. The annular blank 2 is placed in the restraint mould 4, and the outer surface of the annular blank 2 is tangent to the inner surface of the restraint mould 4; the driving core roller 1 is arranged in the annular blank 2, and the axis of the driving core roller is parallel to the axis of the annular blank 2; the ejection ring 3 is positioned on the lower end surface of the annular blank 2 and is attached to the inner surface of the restraint die 4.
Designing the shape and the motion of the die: figure 4 is a schematic view of the flexible growth forming die for the thin-walled polygonal ring-like member. The restraint mould 4 is an annular component, and the shape of the inner surface of the restraint mould is completely consistent with that of the outer surface of the target polygonal ring component; the restraint mould 4 is fixed on the base and keeps fixed in the forming process. The driving core roller 1 is a solid rod, the shape of the outer surface of the driving core roller is matched with that of the inner surface of the target polygonal ring-shaped member, and the diameter of the driving core roller is not larger than that of a corner circular arc of the inner surface of the target polygonal ring-shaped member. The driving core roller 1 passively rotates around the axis thereof in the forming process and simultaneously performs a feeding motion on the inner surface of the annular blank 2 along a preset path. Under the combined action of the restraint die 4 and the driving core roller 1, the annular blank 2 firstly enters a radial deformation stage, metal mainly flows along the circumferential direction, the circumference of the annular blank 2 is continuously expanded, the section profile is continuously formed, and the axial height is basically unchanged; when the outer surface of the annular blank 2 is completely attached to the inner surface of the restraint die 4, the core roller 1 is driven to continue feeding, the annular blank enters an axial deformation stage, the perimeter of the outer surface of the annular blank 2 is kept unchanged, and the axial height is continuously increased; when the feeding amount of the driving core roller 1 reaches a preset value, the driving core roller 1 is not fed any more, but continues to move for at least one circle along a preset path until a target polygonal ring-like member is obtained. Fig. 5 and 6 are schematic diagrams of a flexible growth forming process of the thin-wall polygonal ring-shaped member, and fig. 7 is a schematic diagram of finite element simulation of the flexible growth forming process of the thin-wall polygonal ring-shaped member.
And S3, planning a feeding path of the driving core roller 1, and driving the core roller 1 to perform multi-pass polygonal feeding motion on the inner surface of the annular blank 2, as shown in figure 8. Firstly, the driving core roller 1 moves to a position corresponding to the corner of the inner surface of the restraint die 4 from an initial central position and is attached to the inner surface of the annular blank 2, at the moment, the axis of the driving core roller 1 moves to a position M, then the driving core roller 1 feeds a first-pass feeding amount along the radial direction, and the axis of the driving core roller 1 moves to a position A1And moves for a circle according to the polygon outline of the inner surface of the target polygon ring component, and the motion track is A1-B1-C1-D1-E1-F1(ii) a Subsequently, the driving core roller 1 is fed by the second-pass feeding amount in the radial direction, and the driving core roller 1 is axially moved to A2And moves for a circle according to the polygonal contour of the inner surface of the target polygonal ring-shaped member, and the motion track is A2-B2-C2-D2-E2-F2(ii) a The core roller 1 is driven to repeat the above-described feeding path until the feeding amount thereof reaches a predetermined value of 9.03 mm; in order to ensure the forming stability before the outer surface of the annular blank 2 is completely attached to the inner surface of the constraint mould 4, the core roller 1 is driven to the inner surface of the constraint mould 4Short distance greater than S0When the feeding amount of the driving core roller 1 per pass is small, in order to ensure that the outer surface of the annular blank 2 can be completely forged after being completely attached to the inner surface of the constraint die 4, when the shortest distance from the driving core roller 1 to the inner surface of the constraint die 4 is smaller than S0In this case, the feed amount per pass of the driving core roller 1 is large. Calculating S according to equation (3)0＝6.84mm。
Figure BDA0002714198630000061
Wherein r is0Is the core roll radius.
S4, the outer surface of the ejection ring 3 is polygonal, and the outline of the outer surface of the ejection ring is slightly smaller than that of the target polygonal ring member; the inner surface of the ejection ring 3 is annular, the inner diameter of the ejection ring is slightly smaller than the minimum diameter of the inner surface of the target polygonal ring-shaped member, and fig. 9 is a schematic diagram of the ejection ring 3. After the forming is completed, the ejection ring 3 located in the constraint die 4 pushes the target polygonal ring-shaped member to move upward until the target polygonal ring-shaped member is separated from the constraint die 4, and fig. 10 is a schematic drawing of the target polygonal ring-shaped member.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (3)

1. A flexible growth forming method of a thin-wall polygonal ring-shaped member is characterized by comprising the following steps:
s1, assembling a thin-wall polygonal ring-shaped member flexible growth forming device, wherein the thin-wall polygonal ring-shaped member flexible growth forming device comprises a restraint die, an annular blank, a driving core roller and an ejection ring; the annular blank is placed in the restraint die, and the outer surface of the annular blank is tangent to the inner surface of the restraint die; the driving core roller is arranged in the annular blank, and the axis of the driving core roller is parallel to the axis of the annular blank; the ejection ring is positioned on the lower end face of the annular blank and is attached to the inner surface of the restraint mold; the restraint die is an annular component, and the shape of the inner surface of the restraint die is completely consistent with that of the outer surface of the target polygonal ring-shaped component; the restraint die is fixed on the base and is kept fixed in the forming process; the driving core roller is a solid rod, the shape of the outer surface of the driving core roller is matched with that of the inner surface of the target polygonal ring-shaped member, and the diameter of the driving core roller is not larger than that of a corner circular arc of the inner surface of the target polygonal ring-shaped member; the outer surface of the ejection ring is polygonal, and the outline of the outer surface of the ejection ring is slightly smaller than that of the target polygonal ring-shaped member; the inner surface of the ejection ring is annular, and the inner diameter of the ejection ring is slightly smaller than the diameter of an inscribed circle of the inner surface of the target polygonal ring-shaped member;
s2, driving the core roller to make multi-pass polygonal feeding motion on the inner surface of the annular blank: firstly, driving a core roller to move from an initial central position to a position corresponding to a corner of the inner surface of a constraint mould and attach to the inner surface of an annular blank, then driving the core roller to feed to a first-pass feeding amount position along the radial direction, and moving for a circle according to the polygonal contour of the inner surface of a target polygonal ring-shaped member; then, the core roller is driven to be fed to a second-pass feeding amount position in the radial direction, and moves for a circle according to the polygonal contour of the inner surface of the target polygonal ring-shaped member; driving the core roller to repeat the feeding path until a target polygonal ring-like member is obtained;
the driving core roller passively rotates around the axis of the driving core roller in the forming process, and simultaneously performs feed motion on the inner surface of the annular blank along a preset path; through the combined action of the restraint die and the driving core roller, the metal of the annular blank mainly flows along the circumferential direction, the circumference of the annular blank is continuously expanded, the section outline is continuously formed, and the axial height is basically unchanged; when the outer surface of the annular blank is completely attached to the inner surface of the restraint mold, the core roller is driven to continue feeding, the perimeter of the outer surface of the annular blank is kept unchanged, and the axial height is continuously increased;
and S3, after the forming is finished, the ejection ring in the constraint die pushes the target polygonal ring-shaped member to move upwards until the target polygonal ring-shaped member is separated from the constraint die.
2. The method for forming a thin-walled polygonal ring-like member according to claim 1, wherein the geometric size of said ring-shaped blank is calculated according to formula (1);
Figure FDA0002714198620000021
wherein H0Is the annular blank height, D0Is the diameter of the outer circle of the annular blank, d0The diameter of the inner circle of the annular blank; h is the height of the target polygonal ring member, D is the diameter of an inscribed circle on the outer surface of the target polygonal ring member, and D is the diameter of an inscribed circle on the inner surface of the target polygonal ring member; r is1Is the radius of the corner arc of the outer surface of the target polygonal ring-shaped member r2The radius of the arc of the inner surface corner of the target polygonal ring-shaped member is shown, and lambda is the axial height growth rate.
3. The method for forming a thin-walled polygonal ring-like member in accordance with claim 2 wherein in said step S2, when the shortest distance from the driving core roller to the inner surface of the constraining mold is greater than S0When the feeding amount of the driving core roller per pass is smaller, the shortest distance between the driving core roller and the inner surface of the constraint mould is smaller than S0In time, the feeding amount of each pass of the driving core roller is larger, S0Calculating according to the formula (2);
Figure FDA0002714198620000022
wherein r is0Is the core roll radius.
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CN113083974B (en) * 2021-03-30 2022-12-23 武汉理工大学 Thin-wall grid rib cylinder rolling-flexible growth composite forming method
CN113492155B (en) * 2021-07-12 2022-05-06 武汉理工大学 Biting control method for rolling process of large ring piece under deviation of polygonal outline of blank

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CN108268734A (en) * 2018-01-29 2018-07-10 中国农业大学 A kind of design and forming method of curtain coating formula thin wall irrigation belt runner
CN110479842A (en) * 2019-08-02 2019-11-22 武汉理工大学 Large thin-wall Y shape ring rolling-spinning combined shaping method

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CN105234637B (en) * 2015-11-10 2019-08-02 上海斐赛轴承科技有限公司 The production method of thin-wall bearing, its thin-walled inner ring/outer ring processing method and accurate flexible bearing

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Publication number Priority date Publication date Assignee Title
CN108268734A (en) * 2018-01-29 2018-07-10 中国农业大学 A kind of design and forming method of curtain coating formula thin wall irrigation belt runner
CN110479842A (en) * 2019-08-02 2019-11-22 武汉理工大学 Large thin-wall Y shape ring rolling-spinning combined shaping method

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