CN114985596B - Mold design method for improving multi-degree-of-freedom loading formability of thin-wall high-strength fork-shaped ring - Google Patents
Mold design method for improving multi-degree-of-freedom loading formability of thin-wall high-strength fork-shaped ring Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005096 rolling process Methods 0.000 claims abstract description 74
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical compound C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 239000002760 rocket fuel Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/08—Dies with different parts for several steps in a process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/16—Making other particular articles rings, e.g. barrel hoops
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Abstract
The invention relates to a mold design method for improving the multi-degree-of-freedom loading formability of a thin-wall high-strength fork-shaped ring, which comprises the following steps: s1, designing a thin-wall high-strength fork-shaped ring multi-degree-of-freedom loading forming device: the thin-wall high-strength fork-shaped ring multi-degree-of-freedom loading forming device comprises a rolling die, a constraint die and a blank, wherein the rolling die performs autorotation motion around the axis of the rolling die and simultaneously performs feeding motion along the axial direction, and the constraint die performs rotary motion around the axis of the rolling die; s2, establishing a thin-wall high-strength fork-shaped ring multi-degree-of-freedom loading forming die design space coordinate system; s3, establishing a thin-wall high-strength fork-shaped ring multi-degree-of-freedom loading forming die surface; s4, judging the interference relation between the molding surface of the rolling die and the molding surface of the thin-wall high-rib fork-shaped ring. The method can judge whether the rolling die and the thin-wall high-strength fork-shaped ring interfere in the multi-degree-of-freedom loading forming process, determine the position and the shape of an interference area of the rolling die and the thin-wall high-strength fork-shaped ring, and predict the area for reducing the precision and the surface quality of the thin-wall high-strength fork-shaped ring.
Description
Technical Field
The invention relates to the field of forming and manufacturing of thin-wall high-strength forked rings, in particular to a mold design method for improving multi-degree-of-freedom loading formability of thin-wall high-strength forked rings.
Background
The thin-wall high-rib fork-shaped ring is an important bearing structural member of the carrier rocket fuel storage tank, is not only used for connecting the thin-wall straight barrel section of the fuel storage tank with the thin-wall spherical tank bottom, but also used for connecting the fuel storage tank with the rocket body, and the performance of the thin-wall high-rib fork-shaped ring directly influences the launch success rate and the carrying capacity of the carrier rocket. The thin-wall high-rib fork-shaped ring has the characteristics of thin wall thickness, large diameter and forked shaft section, and has very harsh service conditions. The complex geometric configuration and the harsh service conditions put higher requirements on the manufacturing technology, and the high-performance and high-precision manufacturing becomes a hot spot of the current research.
The multi-degree-of-freedom loading forming process is a continuous local plastic forming method, and can remarkably improve the mechanical property and manufacturing efficiency of the thin-wall high-strength fork-shaped ring. However, because the geometry of the thin-wall high-rib fork-shaped ring is complex, the space movement of the rolling die is complex, and the matching relationship between the thin-wall high-rib fork-shaped ring molded surface and the rolling die surface is very complex. The unreasonable design of the rolling die can cause interference between the molding surface of the rolling die and the molding surface of the thin-wall high-rib fork-shaped ring in the multi-degree-of-freedom loading and forming process, so that the forming precision and the surface quality of the thin-wall high-rib fork-shaped ring are reduced, and even the multi-degree-of-freedom loading and forming process cannot be performed. Therefore, a mold design method for improving the multi-degree-of-freedom loading formability of the thin-wall high-strength fork-shaped ring needs to be provided to solve the problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing a mold design method for improving the multi-degree-of-freedom loading formability of a thin-wall high-strength fork-shaped ring, which can improve the design quality and precision of the mold and avoid interference in the multi-degree-of-freedom loading forming process.
The technical scheme adopted for solving the technical problems is as follows: the method for designing the mould for improving the multi-degree-of-freedom loading formability of the thin-wall high-rib fork-shaped ring is characterized in that the thin-wall high-rib fork-shaped ring is an annular member with a shaft section in a branch shape and consists of an upper rib, a lower rib and a side rib, and comprises the following steps:
s1, designing a thin-wall high-strength fork-shaped ring multi-degree-of-freedom loading forming device: the thin-wall high-strength fork-shaped ring multi-degree-of-freedom loading forming device comprises a rolling die, a constraint die and a blank, wherein the rolling die performs autorotation motion around the axis of the rolling die and simultaneously performs feeding motion along the axial direction, the constraint die performs rotary motion around the axis of the rolling die, the blank is a rectangular-section thin-wall ring blank, and the blank is arranged in the constraint die and is driven by the constraint die to perform rotary motion around the axis of the rolling die; under the combined action of the rolling die and the restriction die, the blank is continuously and locally plastically deformed, and the rectangular section of the blank gradually changes to form a branch shape, so that a thin-wall high-rib fork-shaped ring is obtained;
s2, establishing a thin-wall high-strength forked ring multi-degree-of-freedom loading forming die design space coordinate system: the axis of the thin-wall high-rib fork-shaped ring is taken as a z axis, the plane where the top surface of the rib is positioned is taken as an xy plane, the intersection point of the z axis and the xy plane is taken as a coordinate origin O, and any straight line passing through the O point in the xy plane is taken as an x axis to establish a three-dimensional space coordinate system O-xyz;
s3, establishing a thin-wall high-strength forked ring multi-degree-of-freedom loading forming die surface: in an xOz plane of the three-dimensional space coordinate system O-xyz, taking a curve formed by connecting an inner cylindrical surface contour line of an upper rib of a thin-wall high-rib fork-shaped ring and an upper surface contour line of a side rib as a generating line, and taking a straight line which is arranged above the generating line and has an included angle alpha with an x axis as a rotating shaft, and rotating the generating line for one circle to form a rolling die molded surface; a curve formed by connecting a lower surface contour line of the side rib, a surface contour line of the lower rib and an outer cylindrical surface contour line of the upper rib is taken as a generating line, and the axis of the thin-wall high-rib fork-shaped ring is taken as a rotating shaft, so that a constraint die surface is formed by rotating the generating line for one circle;
s4, judging the interference relation between the molding surface of the rolling die and the molding surface of the thin-wall high-rib fork-shaped ring.
According to the above scheme, the step S4 includes the following steps:
s41, establishing a space equation F of an inner cylindrical surface of the upper rib of the thin-wall high-rib fork-shaped ring 1 (x, y, z) as shown in formula (1):
wherein R is the radius of the inner cylindrical surface of the upper rib of the thin-wall high-rib fork-shaped ring, and h is the axial height of the inner cylindrical surface of the upper rib;
s42, establishing a space equation F of the maximum outer circle contour line of the rolling die 2 (x, y, z) as shown in formula (2):
wherein r is the maximum outer contour radius of the rolling die, (A, B, C) is the axial direction vector of the rolling die, and (x) 0 ,y 0 ,z 0 ) Is the circle center point O of the maximum excircle outline of the rolling die 1 The coordinates, according to the geometric relationship between the rolling die and the thin-wall high-rib fork-shaped ring in the step S3, determine x 0 ＝R-r·sinα，y 0 ＝0，z 0 ＝h+r·cosα；
S43, projecting the inner cylindrical surface of the upper rib of the thin-wall high-rib fork-shaped ring in the step S41 into an xOy plane in the coordinate system O-xyz established in the step S1 to obtain a projection curve l 1 The equation is shown in formula (3):
y 1 2 ＝R 2 -x 2 (3)
s44, in the coordinate system O-xyz established in the step S1, projecting the maximum excircle contour line of the rolling die in the step S42 into an xOy plane to obtain a projection curve l 2 The equation is shown in formula (4):
s45, establishing a rolling die profile and a thin-wall high-rib fork-shaped ring profile interference judgment criterion as follows: if l 1 、l 2 If other intersection points except the tangent point do not exist, the rolling die and the thin-wall high-rib fork-shaped ring do not interfere; if l 1 、l 2 If other intersection points except the tangent point exist, the rolling die and the thin-wall high-rib fork ring can interfere, so that a judgment criterion that the rolling die and the thin-wall high-rib fork ring are not interfered is established, as shown in a formula (5):
where x is E (x) 0 -r·sinα,x 0 +r·sinα)。
According to the scheme, the method further comprises the step S5 of establishing a correlation model among R, alpha and R according to the judgment criterion that interference does not occur between the rolling die and the thin-wall high-rib fork-shaped ring established in the step S45, wherein the correlation model is shown in a formula (6); determining the effective selection range of the sizes r and alpha of the high-precision rolling roller according to a formula (6) to obtain a high-precision rolling die which does not interfere with the thin-wall high-rib fork-shaped ring;
r≤R·sinα (6)
according to the scheme, the range of alpha in the step S3 is
In the method for designing the mould for improving the multi-degree-of-freedom loading formability of the thin-wall high-strength fork-shaped ring, disclosed by the invention.
In the method for designing the mould for improving the multi-degree-of-freedom loading formability of the thin-wall high-strength fork-shaped ring, disclosed by the invention.
The method for designing the die for improving the multi-degree-of-freedom loading formability of the thin-wall high-strength forked ring has the following beneficial effects:
(1) According to the method for designing the die, which is used for improving the multi-degree-of-freedom loading formability of the thin-wall high-rib fork-shaped ring, whether the rolling die and the thin-wall high-rib fork-shaped ring interfere in the multi-degree-of-freedom loading forming process is judged;
(2) Determining the position and shape of an interference area of the rolling die and the thin-wall high-rib fork-shaped ring by calculating the geometric relationship between the projection of the maximum outer contour line of the rolling die and the inner contour line of the inner cylindrical surface of the upper rib of the thin-wall high-rib fork-shaped ring;
(3) The method for designing the die for improving the multi-degree-of-freedom loading formability of the thin-wall high-strength forked ring can predict and reduce the precision and the surface quality area of the thin-wall high-strength forked ring.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic view of a thin-walled high-rib fork-shaped ring;
FIG. 2 is a schematic diagram of a multiple degree of freedom loading forming process;
FIG. 3 is a schematic diagram of a multiple degree of freedom loading forming mold design;
FIG. 4 is a schematic view of the dimension parameters of the rolling die;
FIG. 5a is a schematic view showing the projection curves without interference;
FIG. 5b is a schematic diagram showing the interference of projection curves;
FIG. 6 is a schematic diagram of the position of the interference area;
FIG. 7 is an enlarged schematic view of an interference region;
fig. 8 is a schematic drawing of a sizing die.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
Requiring shapingThe inner diameter R of the thin-wall high-rib fork-shaped ring is 145mm, the wall thickness is 5mm, the rib height is 20mm, and the included angle between the side rib and the upper rib is
The embodiment of the invention provides a mold design method for improving the multi-degree-of-freedom loading formability of a thin-wall high-strength fork-shaped ring, which comprises the following steps:
s1, taking the axis of a thin-wall high-rib fork-shaped ring as a z axis, taking the plane where the top surface of the rib is positioned as an xy plane, taking the intersection point of the z axis and the xy plane as a coordinate origin O, and taking any straight line passing through the O point in the xy plane as an x axis to establish a three-dimensional space coordinate system O-xyz;
s2, taking a curve formed by connecting an inner cylindrical surface contour line of an upper rib of a thin-wall high-rib fork-shaped ring and an upper surface contour line of a side rib as a generating line in an xOz plane of an O-xyz three-dimensional space coordinate system, wherein an included angle between the generating line and an x-axis is formed
The straight line of (2) is a rotation axis, and the bus is rotated for one circle to form a rolling die profile; a curve formed by connecting a lower surface contour line of the side rib, a surface contour line of the lower rib and an outer cylindrical surface contour line of the upper rib is taken as a generating line, and the axis of the thin-wall high-rib fork-shaped ring is taken as a rotating shaft, so that a constraint die surface is formed by rotating the generating line for one circle;
s3, in the coordinate system O-xyz established in the step S1, projecting the inner cylindrical surface of the upper rib of the thin-wall high-rib fork-shaped ring into an xOy plane to obtain a projection curve l 1 Projecting the maximum excircle contour line of the rolling die into an xOy plane to obtain a projection curve l 2 The method comprises the steps of carrying out a first treatment on the surface of the If l 1 、l 2 If other intersection points except the tangent point do not exist, the rolling die and the thin-wall high-rib fork-shaped ring do not interfere; if l 1 、l 2 If other intersection points except the tangent points exist, the rolling die and the thin-wall high-rib fork-shaped ring can interfere; the method for determining that interference does not occur between the rolling die and the thin-wall high-rib fork-shaped ring comprises the following steps of:
s31, establishing a space equation F of the inner cylindrical surface of the upper rib of the thin-wall high-rib fork-shaped ring 1 (x, y, z) as shown in formula (1):
wherein R is the radius of the inner cylindrical surface of the upper rib of the thin-wall high-rib fork-shaped ring, and h is the axial height of the inner cylindrical surface of the upper rib;
s32, taking the radius of the maximum outer circular contour of the rolling die as 130mm, and establishing a space equation F of the maximum outer circular contour line of the rolling die 2 (x, y, z) as shown in formula (2):
wherein r is the radius of the maximum outer circular contour of the rolling die, and (A, B, C) is the axial direction vector of the rolling die, namely (1, 0, 1), (x) 0 ,y 0 ,z 0 ) Is the circle center point O of the maximum excircle outline of the rolling die 1 According to the geometrical relationship between the rolling die and the thin-wall high-rib fork-shaped ring in the step S2, determining x 0 ＝R-r·sinα＝53.07，y 0 ＝0，z 0 ＝h+r·cosα＝101.92；
S33, establishing a projection curve l of the inner cylindrical surface of the upper rib of the thin-wall high-rib fork-shaped ring in the xOy plane 1 The equation is shown in formula (3):
y 1 2 ＝145 2 -x 2 (3)
s34, establishing a projection curve l of the maximum excircle contour line of the rolling die in the xOy plane 2 The equation is shown in formula (4):
y 2 2 ＝r 2 -2×(x-53.07) 2 (4)
s35, establishing a judging equation without interference between the rolling die and the thin-wall high-rib fork-shaped ring, as shown in a formula (5):
D＝y 1 2 -y 2 2 ＝x 2 -212.28x+4231.14>0 (5)
wherein x is E (-38.85,145); can judge when
When r=130 mm, interference occurs between the rolling die and the thin-wall high-rib fork ring;
s4, establishing a correlation model among R, alpha and R according to a judging equation which is established in S35 and does not interfere between the rolling die and the thin-wall high-rib fork-shaped ring, and determining the effective selection range of the rolling roller sizes R and alpha; the correlation model among R, alpha and R is shown in a formula (6):
r≤R·sinα＝102.53 (6)
the embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (3)
1. The mold design method for improving the multi-degree-of-freedom loading formability of the thin-wall high-rib fork-shaped ring is an annular member with a shaft section in a branch shape and consists of an upper rib, a lower rib and a side rib, and is characterized by comprising the following steps of:
s1, designing a thin-wall high-strength fork-shaped ring multi-degree-of-freedom loading forming device: the thin-wall high-strength fork-shaped ring multi-degree-of-freedom loading forming device comprises a rolling die, a constraint die and a blank, wherein the rolling die performs autorotation motion around the axis of the rolling die and simultaneously performs feeding motion along the axial direction, the constraint die performs rotary motion around the axis of the rolling die, the blank is a rectangular-section thin-wall ring blank, and the blank is arranged in the constraint die and is driven by the constraint die to perform rotary motion around the axis of the rolling die; under the combined action of the rolling die and the restriction die, the blank is continuously and locally plastically deformed, and the rectangular section of the blank gradually changes to form a branch shape, so that a thin-wall high-rib fork-shaped ring is obtained;
s2, establishing a thin-wall high-strength forked ring multi-degree-of-freedom loading forming die design space coordinate system: takes the axis of the thin-wall high-strength fork-shaped ring as the axiszThe plane of the shaft on which the top surface of the rib is positioned isxyPlane tozShaft and method for producing the samexyThe intersection point of the planes is the origin of coordinatesOToxyIn-plane crossingOAny straight line of points beingxShaft establishing three-dimensional space coordinate systemO-xyz；
S3, establishing a thin-wall high-strength forked ring multi-degree-of-freedom loading forming die surface: in three-dimensional space coordinate systemO-xyzA kind of electronic devicexOzIn the plane, the curve formed by connecting the inner cylindrical surface contour line of the upper rib of the thin-wall high-rib fork-shaped ring and the upper surface contour line of the side rib is taken as a generating line, so that the generating line is above and connected with the generating linexIncluded angle of axes
The straight line of (2) is a rotation axis, and the bus is rotated for one circle to form a rolling die profile; a curve formed by connecting a lower surface contour line of the side rib, a surface contour line of the lower rib and an outer cylindrical surface contour line of the upper rib is taken as a generating line, and the axis of the thin-wall high-rib fork-shaped ring is taken as a rotating shaft, so that a constraint die surface is formed by rotating the generating line for one circle;
s4, judging the interference relation between the molding surface of the rolling die and the molding surface of the thin-wall high-rib fork-shaped ring;
the step S4 includes the steps of:
s41, establishing a space equation of an inner cylindrical surface of the upper rib of the thin-wall high-rib fork-shaped ring
As shown in formula (1):
in the method, in the process of the invention,
is the radius of the inner cylindrical surface of the upper rib of the thin-wall high-rib fork-shaped ring, < > and the inner cylindrical surface of the upper rib of the thin-wall high-rib fork-shaped ring, < >>
The axial height of the inner cylindrical surface of the upper rib;
s42, establishing a space equation of the maximum outer circle contour line of the rolling die
As shown in formula (2):
in the method, in the process of the invention,
for the maximum outer contour radius of the rolling die, < > for>
Is the axial direction vector of the rolling die, +.>
Is the center point of the maximum outer circle outline of the rolling die +.>
Coordinates, determining +.A. according to the geometric relationship between the rolling die and the thin-wall high-rib fork-shaped ring in the step S3>
，
，
；
S43, the coordinate system established in the step S2O-xyzIn, the inner cylindrical surface of the upper rib of the thin-wall high-rib fork-shaped ring in the step S41 is projected toxOyIn plane, obtain projection curve
The equation is shown in formula (3):
s44, at stepS1 establishing a coordinate systemO-xyzIn, the maximum outer circular contour line of the rolling die in the step S42 is projected toxOyIn plane, obtain projection curve
The equation is shown in formula (4):
s45, establishing a rolling die profile and a thin-wall high-rib fork-shaped ring profile interference judgment criterion as follows: if it is
、
If other intersection points except the tangent point do not exist, the rolling die and the thin-wall high-rib fork-shaped ring do not interfere; if->
、
If other intersection points except the tangent point exist, the rolling die and the thin-wall high-rib fork ring can interfere, so that a judgment criterion that the rolling die and the thin-wall high-rib fork ring are not interfered is established, as shown in a formula (5):
wherein the method comprises the steps of
。
2. The method for designing a mold for improving multiple degree of freedom loading formability of a thin-walled high-strength fork-shaped ring according to claim 1, further comprising the step of S5, according to S45Establishing a judging criterion that no interference occurs between a rolling die and a thin-wall high-rib fork-shaped ring, and establishing
A correlation model between the two, as shown in formula (6); determining the size of the high-precision rolling roller according to the formula (6)>
The effective selection range of the high-precision rolling die is obtained, and the high-precision rolling die is not interfered with the thin-wall high-rib fork-shaped ring;
3. the method for designing a mold for improving multiple degrees of freedom loading formability of a thin-walled high-strength fork-shaped ring according to claim 1, wherein in the step S3
Is in the range of +.>
。/>
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001087836A (en) * | 1999-09-17 | 2001-04-03 | Kobe Steel Ltd | Special shaped ring |
| EP1270105A1 (en) * | 2001-06-26 | 2003-01-02 | ATFI Llobregat, S.L. | Roller for spinning lathes |
| GB201503825D0 (en) * | 2015-03-06 | 2015-04-22 | Cambridge Entpr Ltd | Ring rolling process and apparatus for ring rolling |
| CN110479840B (en) * | 2019-08-02 | 2020-08-18 | 武汉理工大学 | Enveloping rolling forming method for thin-wall high-rib cylindrical component |
| CN110479842B (en) * | 2019-08-02 | 2020-11-24 | 武汉理工大学 | Rolling-spinning composite forming method for large-sized thin-wall Y-shaped ring part |
| CN110479927B (en) * | 2019-08-02 | 2020-08-04 | 武汉理工大学 | Large-scale thin-wall fork-shaped ring piece restraining diameter axial rolling forming method |
| CN111604421B (en) * | 2020-05-07 | 2021-09-28 | 上海交通大学 | Flow spinning forming die for cylindrical part with crossed ribs |
| CN112296232B (en) * | 2020-10-06 | 2022-06-17 | 武汉理工大学 | Composite forming method for improving high-rib forming limit of thin-wall high-rib component |
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