CN104028647A - Mushroom type rigid partitioning terrace die for bulging of thin-wall pipe fitting - Google Patents
Mushroom type rigid partitioning terrace die for bulging of thin-wall pipe fitting Download PDFInfo
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- CN104028647A CN104028647A CN201410228711.4A CN201410228711A CN104028647A CN 104028647 A CN104028647 A CN 104028647A CN 201410228711 A CN201410228711 A CN 201410228711A CN 104028647 A CN104028647 A CN 104028647A
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- 235000001674 Agaricus brunnescens Nutrition 0.000 title claims abstract description 10
- 230000004323 axial length Effects 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 12
- 238000007373 indentation Methods 0.000 abstract description 4
- 238000003754 machining Methods 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 description 12
- 238000012545 processing Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
A mushroom type rigid partitioning terrace die for bulging of a thin-wall pipe fitting comprises an umbrella-shaped portion and a root portion which are integrally formed. The axial length of the umbrella-shaped portion and the axial length of the root portion are consistent with the axial length of a pipe blank, the umbrella-shaped portion is of a cylinder structure with the arc-shaped cross section, the radius of the arc shape is equal to the radius R of the thin-wall pipe fitting, the central angle corresponding to the arc shape is alpha, the root portion is of a cylinder structure with the cross section in an isosceles trapezoid shape, and the root portion is arranged to abut against the vertical plane of the umbrella-shaped portion. According to the thin-wall pipe fitting manufactured through the partitioning terrace die, the problems that parts in a clearance of the terrace die are prone to being broken in the round partitioning terrace die forming process, and indentations and corner angles are generated on the surfaces of the parts through the clearance of the die can be effectively solved in the forming process, and dimensional accuracy obtained after the parts are formed is guaranteed. The clearance between mushroom type partitioning terrace dies is far smaller than the clearance between round terrace dies in the forming ending state, and the dimensional accuracy and machining quality of the bulging parts can be effectively guaranteed.
Description
Technical Field
The invention belongs to the field of mechanical design, and relates to a design method of parts of a passenger car and a mold design in the field of plastic processing, in particular to a design of a thin-wall pipe fitting processing mold.
Background
The thin-wall pipe fitting has the characteristics of hollowness, light weight and the like, and is more and more widely applied to the aerospace industry, the nuclear industry, the building industry and the automobile industry. In addition, compared with sheet metal parts, the pipe fitting has the characteristics of high rigidity, high strength and good shock resistance, and is beneficial to vibration reduction and noise reduction, so that the pipe fitting is widely applied to the industrial field.
At present, the forming method of thin-wall pipe fittings at home and abroad mainly comprises hydraulic bulging and rigid partitioning male die bulging. The basic principle of hydraulic bulging is as follows: the tube blank is formed into the shape of the required part by introducing a liquid medium such as water or oil into the tube, and then applying pressure to the liquid medium. The hydraulic bulging is relatively mature in development, but the problems of high pressure supply, sealing under high pressure, prevention of liquid leakage under high pressure and the like can be involved, so that the development cost of hydraulic forming equipment and a die is very high, and the hydraulic bulging is suitable for manufacturing large-batch parts. The other pipe fitting bulging method with relatively low cost adopts rigid block male die bulging, and the basic principle of the method is as follows: the mould is composed of a plurality of fan-shaped blocks, and each block mould can move along the radial direction under the action of a press sliding block in the forming process to drive the pipe blank to be close to the inner wall of the female die so as to form parts. Because the diameter of the die in the initial state is smaller than that of the die in the final bulging state, certain gaps exist among the block dies in the final bulging state, and the gaps enable the inner wall and the outer wall of the part to generate certain indentations or edges, so that the size precision and the use function of the part are seriously influenced. In addition, when the bulging is finished, the tube blank at the gap of the die is in a bidirectional stretching state, so that the defects of cracking and the like are easy to occur at the position. Therefore, a mushroom-shaped block die is researched and designed for realizing high-precision bulging of the thin-wall pipe fitting.
Disclosure of Invention
The invention provides a novel mushroom type partitioning male die, which solves the problems of poor part size precision in the existing hydraulic bulging process adopted at home and abroad, poor part size precision caused by die gaps in the bulging of a circular partitioning male die, easiness in cracking at the gaps and the like, and can realize high-precision bulging of thin-wall pipes.
In order to achieve the above purpose, the solution of the invention is as follows:
the utility model provides a mushroom type partitioning terrace die for thin-walled tube bulging, includes integrated into one piece's umbelliform portion and root, umbelliform portion with root axial parallel and level sets up, just umbelliform portion with the axial length of root is unanimous with thin-walled tube's axial length:
the umbrella-shaped part is of a cylinder structure with an arc-shaped cross section, the radius of the arc is equal to the radius R of the thin-wall pipe fitting, and the central angle corresponding to the arc is alpha;
the root part is of a cylinder structure with an isosceles trapezoid cross section, the root part is arranged against the vertical plane of the umbrella-shaped part, and the distance l between one end point of the upper bottom edge of the isosceles trapezoid and the arc end point on the same side1The size of (A) is as follows:
the angle of two base angles at the lower bottom edge of the isosceles trapezoid is alpha;
the length l of the lower bottom edge of the isosceles trapezoid2The size of (A) is as follows:
wherein,n is the number of the mold blocks,
preferably, the number n of the mold blocks is an even number.
Preferably, the hardness of the material for manufacturing the male die is higher than that of the material for manufacturing the thin-wall pipe fitting.
The invention has the beneficial effects that: the blocking male die disclosed by the invention is adopted to realize bulging, so that the problems that a part is easy to break at a die gap and the die gap generates indentations and edges on the surface of the part in the forming process of the round blocking male die can be effectively avoided, and the dimensional accuracy of the part after forming is ensured; when the forming is finished, the clearance between the blocking convex dies is far smaller than that of the round convex dies, and the size precision and the processing quality of the bulging part can be effectively ensured.
And the size and the number of the blocking convex dies can be adjusted according to actual needs, so that the blocking convex dies can adapt to pipe fittings with different geometric sizes, and have good adaptability.
Drawings
FIG. 1 is a schematic structural view of an embodiment of the segmented punch of the present invention;
FIG. 2-1 is a block schematic of a target tubular profile;
2-2 each arc translation diagram;
FIGS. 2-3 are final geometry determination diagrams;
FIG. 3-1 is a schematic view of a pre-bulging segmented punch polycondensation state in a process of bulging of a punch structure of the present invention;
FIG. 3-2 shows the segmented punch condition during bulging;
fig. 3-3 shows the segmented punch condition at the end of bulging.
Detailed Description
The following further describes the implementation of the present invention with reference to the accompanying drawings.
As shown in figure 1, the invention discloses a mushroom type partitioning male die for bulging of a thin-wall pipe fitting, which comprises an umbrella-shaped part 10 and a root part 20, wherein the umbrella-shaped part 10 and the root part 20 are arranged in parallel and level, the umbrella-shaped part 10 and the root part 20 are integrally formed in a machining mode, and the axial lengths of the umbrella-shaped part 10 and the root part 20 are consistent with the axial length of the thin-wall pipe fitting. Wherein, the umbrella-shaped part 10 is a cylinder structure with an arc-shaped cross section, the radius of the arc is equal to the radius R of the thin-wall pipe fitting, the central angle corresponding to the arc is alpha, the root part 20 is a cylinder structure with an isosceles trapezoid cross section, the cylinder structure is adjacent to the vertical plane of the umbrella-shaped part, and the distance from one end point of the bottom edge of the isosceles trapezoid to the arc end point of the same side <math>
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The angle of two base angles at the lower bottom edge of the isosceles trapezoid is alpha;
length l of lower base of isosceles trapezoid2The size of (A) is as follows:
wherein,n is the number of the male die blocks,d and h are ranges obtained according to experience, and the ranges can be flexibly selected. The value range of d is determined according to the male die pushing mechanism, in the embodiment,the larger the width of the contact surface of the mechanism and the male die is, the smaller the value d is, otherwise, the larger the value d is; h is determined according to the punch pushing mechanism, the width of the contact surface of the mechanism and the punch is large, the value of h is correspondingly smaller, otherwise, the value of h is larger, and in the embodiment, the specific value of h can be calculated according to a calculation formula of the height of the trapezoid.
The specific dimensioning method of the blocking punch for bulging thin-walled tubes according to the invention is shown in figures 2-1 to 2-3.
(1) As shown in fig. 2-1, firstly, the contour of a target pipe (namely, a thin-wall pipe) is divided into an even number of blocks n according to the size of the pipe, an origin is selected for each divided arc along the clockwise direction, then each arc rotates around the endpoint by an angle beta in the anticlockwise direction, wherein the angle beta is determined according to the number of the blocking convex dies
(2) As shown in fig. 2-2, the circular arc after each rotation is translated by a distance d along the radial direction, wherein d is in the range of
(3) As shown in fig. 2-3, a chord of each arc is formed and translated radially inward a distance h. The geometric shape of the male die can be finally obtained by deleting the geometric interference part, as shown in fig. 2-3 below.
The specific working process of the partitioning male die for thin-wall pipe bulging shown in the invention is shown in figures 3-1 to 3-3.
(1) Determining the number n and the size of the segmented convex dies according to the geometric shape of the thin-wall pipe fitting and the material characteristics of the pipe blank, and processing the segmented convex dies, wherein the material of the convex dies is determined according to the material of the pipe blank, so that the hardness of the convex dies is higher than that of the pipe blank, and no other special limitation exists;
(2) before processing, the convex dies are shrunk together, before bulging, the block convex dies are shrunk together, and at the moment, the root parts 20 of the block convex dies are mutually contacted to form an arc surface coaxial with the tube blank;
(3) the convex die moves along the radial direction in the processing process, and each block convex die moves along the radial direction firstly in the pipe fitting bulging process;
(4) the tube blank is contacted and then does rotary motion until the outer contour of the male die is completely contacted with the inner wall of the tube blank to realize bulging, and when each point on the arc-shaped surface of the umbrella-shaped part 10 of the blocking male die is contacted with the tube blank, then does rotary motion until the outer contour surface of the blocking male die is completely contacted with the inner wall of the tube blank to realize bulging.
The partitioning male die for thin-wall pipe bulging divides a bulging male die on the inner wall of a pipe blank into an even number according to the axial symmetry characteristic of a target thin-wall pipe, so that each male die can be uniformly stressed in the bulging process, and the shape of a mushroom male die is shown in the attached drawing 1. The parameters of the male die comprise the number n of the divided male die blocks and the size l of the cross section of the root part of the divided male die2The height h of the root part of the partitioning male die (the height of an isosceles trapezoid) and the arc radius R of the mushroom umbrella-shaped part of the partitioning male die. At the final state of formingAnd the clearance between the mushroom male dies is far smaller than that of the circular male dies, so that the size precision and the processing quality of the bulging part can be effectively ensured. The problems that parts are easy to break at the male die gap and die gaps generate indentations and edges and corners on the surfaces of the parts in the forming process of the round block male die can be effectively avoided, and the size precision of the parts after forming is guaranteed. And the root size (the length of the lower bottom edge of the isosceles trapezoid) l of the male die can be determined according to the initial diameter of the tube blank2The size of the umbrella-shaped part of the male die is equal to the size of the pipe fitting bulging area divided by the number of the male die blocks, the number of the male die blocks can be adjusted according to the geometric size of a part, and the size of each block male die can also be adjusted. In the bulging process, the blocking convex dies firstly perform radial feeding motion by taking the central shaft of the tube blank as the center, and perform rotary motion after the top ends of the blocking convex dies are contacted with the inner wall of the tube blank to realize the final forming of the tube fittings, so that the blocking convex dies can adapt to the tube fittings with different geometric sizes, and ensure good adaptability
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (5)
1. The utility model provides a mushroom type partitioning terrace die for thin wall pipe bulging which characterized in that: umbrella portion and root including integrated into one piece, umbrella portion with root axial parallel and level sets up, just umbrella portion with the axial length of root is unanimous with thin-walled tube's axial length:
the umbrella-shaped part is of a cylinder structure with an arc-shaped cross section, the radius of the arc is equal to the radius R of the thin-wall pipe fitting, and the central angle corresponding to the arc is alpha;
the root is a cylinder structure with an isosceles trapezoid cross section, and the root is abutted against the vertical plane of the umbrella-shaped part.
2. The segmented mold of claim 1, wherein: the distance l between one end point of the upper bottom edge of the isosceles trapezoid and the arc end point on the same side1The size of (A) is as follows:
the angle of two base angles at the lower bottom edge of the isosceles trapezoid is alpha;
wherein,n is the number of the mold blocks,
3. the block die according to claim 1 or 2, wherein: length l of lower base edge of isosceles trapezoid2The size of (A) is as follows:
wherein,n is the number of the mold blocks,
4. the segmented mold of claim 1, wherein: the number n of the mold blocks is an even number.
5. The segmented mold of claim 1, wherein: the hardness of the male die manufacturing material is higher than that of the thin-wall pipe fitting material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410228711.4A CN104028647B (en) | 2014-05-27 | 2014-05-27 | Mushroom type rigid partitioning terrace die for bulging of thin-wall pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410228711.4A CN104028647B (en) | 2014-05-27 | 2014-05-27 | Mushroom type rigid partitioning terrace die for bulging of thin-wall pipe fitting |
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| Publication Number | Publication Date |
|---|---|
| CN104028647A true CN104028647A (en) | 2014-09-10 |
| CN104028647B CN104028647B (en) | 2017-01-11 |
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| CN201410228711.4A Expired - Fee Related CN104028647B (en) | 2014-05-27 | 2014-05-27 | Mushroom type rigid partitioning terrace die for bulging of thin-wall pipe fitting |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2780271A (en) * | 1951-09-27 | 1957-02-05 | Smith Corp A O | Apparatus for mechanically expanding large diameter pipe |
| US3572081A (en) * | 1969-04-21 | 1971-03-23 | United States Steel Corp | Apparatus for mechanically expanding large diameter pipe |
| JPS51103858A (en) * | 1975-03-11 | 1976-09-14 | Sumitomo Metal Ind | Mekanikaru ekisupanda hetsudoyono henkeidai |
| CN1069685A (en) * | 1992-05-30 | 1993-03-10 | 西安交通大学 | A kind of method of precisely forming of thin-wall tube-shaped element |
| US5992197A (en) * | 1997-03-28 | 1999-11-30 | The Budd Company | Forming technique using discrete heating zones |
| CN101879553A (en) * | 2010-07-06 | 2010-11-10 | 奇瑞汽车股份有限公司 | Drawing die for high-tension plates and drawing technique utilizing same |
-
2014
- 2014-05-27 CN CN201410228711.4A patent/CN104028647B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2780271A (en) * | 1951-09-27 | 1957-02-05 | Smith Corp A O | Apparatus for mechanically expanding large diameter pipe |
| US3572081A (en) * | 1969-04-21 | 1971-03-23 | United States Steel Corp | Apparatus for mechanically expanding large diameter pipe |
| JPS51103858A (en) * | 1975-03-11 | 1976-09-14 | Sumitomo Metal Ind | Mekanikaru ekisupanda hetsudoyono henkeidai |
| CN1069685A (en) * | 1992-05-30 | 1993-03-10 | 西安交通大学 | A kind of method of precisely forming of thin-wall tube-shaped element |
| US5992197A (en) * | 1997-03-28 | 1999-11-30 | The Budd Company | Forming technique using discrete heating zones |
| CN101879553A (en) * | 2010-07-06 | 2010-11-10 | 奇瑞汽车股份有限公司 | Drawing die for high-tension plates and drawing technique utilizing same |
Non-Patent Citations (1)
| Title |
|---|
| 余海燕等: "减振器套管分块刚模胀形方案分析", 《2013中国汽车工程学会年会论文集》 * |
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