CN117840324A - Forming method and device for continuous variable-section thin-wall cabin shell - Google Patents
Forming method and device for continuous variable-section thin-wall cabin shell Download PDFInfo
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- CN117840324A CN117840324A CN202410260064.9A CN202410260064A CN117840324A CN 117840324 A CN117840324 A CN 117840324A CN 202410260064 A CN202410260064 A CN 202410260064A CN 117840324 A CN117840324 A CN 117840324A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 229920002635 polyurethane Polymers 0.000 claims abstract description 43
- 239000004814 polyurethane Substances 0.000 claims abstract description 43
- 238000007599 discharging Methods 0.000 claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 229920003225 polyurethane elastomer Polymers 0.000 claims 1
- 238000003466 welding Methods 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Abstract
The invention provides a forming method and a forming device for a continuous variable-section thin-wall cabin section shell piece, wherein the forming method comprises an upper die base plate, an upper punch, a polyurethane elastic core body, a constant-section die sleeve, a variable-section necking die, a lower die base plate and a discharging punch, wherein the upper die base plate and the upper punch are fixed on a movable beam body of a hydraulic machine through bolts, the variable-section necking die and the lower die base plate are fixed above a workbench of the hydraulic machine, and the polyurethane elastic core body is arranged on the inner side of a prefabricated blank; the forming method comprises the following steps: and placing the prefabricated blank filled with the polyurethane elastic core body in a constant-section die sleeve, applying downward load to the prefabricated blank and the polyurethane elastic core body along the axial direction through an upper die base plate and an upper punch, performing continuous gradual necking forming, and applying vertical upward ejection force to the variable-section shell and the polyurethane elastic core body in the variable-section necking die through a discharge punch after necking forming is completed, so as to finish discharging of the variable-section shell piece. The shell part manufactured by adopting the method has the advantages of good integrity, no thinning of wall thickness and the like.
Description
Technical Field
The invention relates to the technical field of forming of variable-section shell parts for spaceflight, in particular to a method and a device for forming a continuous variable-section thin-wall cabin-section shell part.
Background
The common preparation method of the variable-section thin-wall cabin shell part is that a left half shell part and a right half shell part with a certain inclination are punched and formed, and then the two shell parts are assembled and welded into a whole. This conventional manufacturing process has the following disadvantages: as a aerospace shell, the welding technique will directly determine the tightness and basic strength of the shell. In case of welding quality problems in the actual welding process, the shell member may leak or even break, and there is a great potential safety hazard. In addition, because the rigidity of the thin-wall part is small, welding deformation and burning-through phenomena are easy to occur in the welding process, and the yield of the variable-section thin-wall shell part is greatly reduced. Meanwhile, the traditional forming process also has the problems of low production efficiency, high forming die cost, low dimensional accuracy and the like.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a forming method and a forming device for a continuous variable-section thin-wall cabin section type shell, and the obtained variable-section thin-wall shell not only avoids potential safety hazards of welding quality, but also has the advantages of attractive appearance, smooth and excessive connection of the variable-section shell and the constant-section shell, simple and convenient process, uniform wall thickness, high precision, high overall strength and the like.
In order to achieve the above object, the present invention provides the following solutions: the forming device sequentially comprises an upper die base plate, an upper punch, a polyurethane elastic core body, a constant-section die sleeve, a variable-section necking die, a lower die base plate and a discharging punch from top to bottom according to the assembly sequence, wherein the upper die base plate and the upper punch are fixedly connected to a movable beam body of a hydraulic machine through bolts, the variable-section necking die and the lower die base plate are fixed above a workbench of the hydraulic machine, and the polyurethane elastic core body is arranged on the inner side of a prefabricated blank.
Preferably, the working part of the upper punch is in clearance fit with the inner hole of the constant-section die sleeve, and the section size of the inner hole of the connecting part of the constant-section die sleeve and the variable-section necking die is equal.
Preferably, the constant cross section die sleeve is provided with a convex spigot, the variable cross section necking die is provided with a concave spigot, and the convex spigot is matched with the concave spigot and is used for preventing the die from transverse deformation.
Preferably, the bottom end of the variable-section necking die is further provided with a through hole with the length of 30mm, and the section size of the through hole is equal to the shape size of the minimum hole of the variable-section necking die.
Preferably, the preform is an original material before necking deformation, the polyurethane elastic core body is arranged in the through hole of the preform, the preform and the polyurethane elastic core body are both arranged in the through hole of the constant-section die sleeve, and the outer contour cross section size of the preform is equal to the inner hole size of the constant-section die sleeve.
Preferably, the polyurethane elastic core has a size equal to the inner hole size of the preform, and the polyurethane elastic core has a length greater than the length of the preform.
Preferably, the working part of the discharging punch is in clearance fit with the through hole at the lower end of the variable-section necking die, and the discharging punch is fixedly connected to the hydraulic press ejection cylinder through a bolt.
The invention also provides a forming method of the continuous variable cross-section thin-wall cabin section shell-like piece, which comprises the following steps:
s1, preparing a shell preform with a uniform cross section through an extrusion process;
s2, placing the prefabricated blank filled with the polyurethane elastic core body in a constant-section die sleeve, applying downward load to the prefabricated blank and the polyurethane elastic core body along the axial direction through an upper die base plate and an upper punch fixed on a movable beam of a hydraulic press, and carrying out continuous gradual necking forming;
and S3, after the necking forming is finished, applying vertical upward ejection force to the variable cross-section shell and the polyurethane elastic core body in the variable cross-section necking die through an ejection punch fixed on an ejection cylinder of the hydraulic press, and completing the unloading process of the variable cross-section shell.
Preferably, in the step S2, the necking forming process is as follows: the prefabricated blank and the polyurethane elastic core body are extruded into a variable-section necking die from a constant-section die sleeve under the action of load, the cross section size is gradually reduced, and continuous gradual necking formation is realized.
Preferably, in the necking forming process, the polyurethane elastic core body with high elastic modulus is used for supporting the preform inside so as to coordinate the shrinkage deformation of the preform and inhibit the instability of the sheet in the shrinkage deformation.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
(1) The invention provides a forming method and a forming device for a continuous variable-section thin-wall cabin section shell piece, wherein the forming device is of a combined splicing structure, a prefabricated blank can realize continuous gradual shrinkage deformation under the combined action of a constant-section die sleeve, a variable-section necking die and a polyurethane elastic core body, and the prepared variable-section shell piece has the advantages of streamline structure, good integrity and high strength. The constant-section die sleeve and the variable-section necking die are transversely positioned through the spigot grooves, so that the upper die and the lower die are ensured to be neutral. The polyurethane elastic core body with larger elastic modulus can effectively inhibit the instability phenomenon of shrinkage cavity deformation of the preform. In addition, the lower end of the variable cross-section necking die is provided with a through hole with the length of about 30mm, so that the unloading process after the forming is finished is facilitated.
(2) The forming method and the forming device provided by the invention have the advantages that the potential safety hazard of welding quality is avoided, the integrity of the shell is good, the appearance is attractive, the joint of the variable-section shell and the constant-section shell is smooth and excessive, the process is simple and easy to implement, the wall thickness is uniform, the precision is high, the overall strength is high, and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an exploded view of a structure provided by a forming device for a continuous variable cross-section thin-wall cabin class shell member;
FIG. 2 is a schematic illustration of an assembly provided by a forming apparatus for a continuous variable cross-section thin-walled deck section shell-like member in accordance with the present invention;
FIG. 3 is a schematic view of an assembled section of a medium section die sleeve + variable section necking die in the direction A-A of the medium section die sleeve set of the present invention;
FIG. 4 is an assembled cross-sectional view of a medium section die sleeve + variable section necking die in the direction A-A of the medium section die sleeve set of the present invention;
fig. 5 is a schematic flow chart of a method for forming a shell-like member of a continuous variable cross-section thin-wall cabin section according to the present invention.
Reference numerals illustrate:
1-upper die backing plate, 2-upper punch, 3-polyurethane elastic core body, 4-constant section die sleeve, 5-variable cross-section necking die, 6-lower die backing plate, 7-unloading punch and 8-preform.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a forming method and a forming device for a continuous variable-section thin-wall cabin section type shell, and the obtained variable-section thin-wall shell not only avoids potential safety hazards of welding quality, but also has the advantages of attractive appearance, smooth and excessive connection of the variable-section shell and a constant-section shell, simple and convenient process, easy implementation, uniform wall thickness, high precision, high overall strength and the like.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1, the invention provides a forming device for a continuous variable-section thin-wall cabin-section shell, which sequentially comprises an upper die base plate 1, an upper punch 2, a polyurethane elastic core body 3, a constant-section die sleeve 4, a variable-section necking die 5, a lower die base plate 6 and a discharging punch 7 from top to bottom according to the assembly sequence, wherein the upper die base plate 1 and the upper punch 2 are fixedly connected to a movable beam body of a hydraulic machine through bolts, the variable-section necking die 5 and the lower die base plate 6 are fixed above a workbench of the hydraulic machine, and the polyurethane elastic core body 3 is correspondingly arranged at the inner side of a preform 8. In this embodiment, the cross section of the preform 8 is in a special-shaped geometry, the working portion of the upper punch 2 is in clearance fit with the inner hole of the constant-section die sleeve 4, and the cross section size of the inner hole of the connecting portion of the constant-section die sleeve 4 and the variable-section necking die 5 is equal. In addition, the forming device can also change the working section sizes of the upper punch 2, the constant section die sleeve 4, the variable section necking die 5 and the unloading punch 7 according to the use requirement of the product, so that the variable section shell thin-wall part with any geometric shape can be prepared.
Referring to fig. 3 and 4, a male spigot is provided on the constant section die sleeve 4, a female spigot is provided on the variable section necking die 5, the male spigot is provided corresponding to the female spigot, and the lateral deformation of the die is prevented while the limiting centering effect is achieved through the spigot. Referring to fig. 4, the bottom end of the variable-section necking die 5 is further provided with a through hole with the length of 30mm, and the cross section size of the through hole is equal to the minimum hole shape size of the variable-section necking die 5.
The working position of the discharging punch 7 is in clearance fit with the through hole at the lower end of the variable-section necking die 5, and the discharging punch 7 is fixedly connected to an ejection cylinder of the hydraulic machine through a bolt.
In addition, the preform 8 is an original material before necking deformation, the polyurethane elastic core body 3 is arranged in the through hole of the preform 8, the preform 8 and the polyurethane elastic core body 3 are both arranged in the through hole of the constant-section die sleeve 4, and the outer contour cross section size of the preform 8 is equal to the inner hole size of the constant-section die sleeve 4. The polyurethane elastic core 3 has the same size as the inner hole of the preform 8, and the length of the polyurethane elastic core 3 is greater than the length of the preform 8. The outline size of the polyurethane elastic core body 3 can be increased or reduced according to the change of the wall thickness size of the prefabricated blank 8, variable-section shell parts with different wall thicknesses can be prepared, and the wall thickness is not thinned in the necking deformation process. Meanwhile, the polyurethane elastic core body 3 has a larger elastic modulus, and can coordinate the preform 8 to generate necking deformation under the action of axial load, and meanwhile, the instability of the thin plate in necking deformation is effectively restrained.
As shown in FIG. 5, the invention also provides a forming method of the continuous variable cross-section thin-wall cabin section shell-like piece, which comprises the following steps:
s1, preparing a shell preform with a uniform section through a traditional extrusion process;
s2, placing the prefabricated blank filled with the polyurethane elastic core body in a constant-section die sleeve, applying downward load to the prefabricated blank and the polyurethane elastic core body along the axial direction through an upper die base plate and an upper punch fixed on a movable beam of a hydraulic press, and carrying out continuous gradual necking forming;
wherein, the necking forming process is as follows: the prefabricated blank and the polyurethane elastic core body are extruded into a variable-section necking die from a constant-section die sleeve under the action of load, the cross section size is gradually reduced, continuous gradual necking forming is realized, and in the necking forming process, the prefabricated blank is internally supported by the polyurethane elastic core body with high elastic modulus so as to coordinate the prefabricated blank to perform necking deformation, and the sheet is restrained from being unstable in the necking deformation;
and S3, after the necking forming is finished, applying vertical upward ejection force to the variable cross-section shell and the polyurethane elastic core body in the variable cross-section necking die through an ejection punch fixed on an ejection cylinder of the hydraulic press, and completing the unloading process of the variable cross-section shell.
By the device and the forming method, the variable cross-section thin-wall shell with different cross-section shapes and wall thicknesses can be prepared, the preparation process is simple, the integrity of the shell is good, the wall thickness is uniform, the quality of the variable cross-section shell is improved, and the preparation cost is reduced.
Therefore, the invention has the following beneficial effects:
(1) The invention provides a forming method and a forming device for a continuous variable-section thin-wall cabin section shell piece, wherein the forming device is of a combined splicing structure, a prefabricated blank can realize continuous gradual shrinkage deformation under the combined action of a constant-section die sleeve, a variable-section necking die and a polyurethane elastic core body, and the prepared variable-section shell piece has the advantages of streamline structure, good integrity and high strength. The constant-section die sleeve and the variable-section necking die are transversely positioned through the spigot grooves, so that the upper die and the lower die are ensured to be neutral. The polyurethane elastic core body with larger elastic modulus can effectively inhibit the instability phenomenon of shrinkage cavity deformation of the preform. In addition, the lower end of the variable cross-section necking die is provided with a through hole with the length of about 30mm, so that the unloading process after the forming is finished is facilitated.
(2) The forming method and the forming device provided by the invention have the advantages that the potential safety hazard of welding quality is avoided, the integrity of the shell is good, the appearance is attractive, the joint of the variable-section shell and the constant-section shell is smooth and excessive, the process is simple and easy to implement, the wall thickness is uniform, the precision is high, the overall strength is high, and the like.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. The forming device for the continuous variable-section thin-wall cabin shell is characterized by sequentially comprising an upper die base plate, an upper punch, a polyurethane elastic core body, a constant-section die sleeve, a variable-section necking die, a lower die base plate and a discharging punch from top to bottom according to the assembly sequence, wherein the upper die base plate and the upper punch are fixedly connected to a movable beam body of a hydraulic machine through bolts, the variable-section necking die and the lower die base plate are fixed above a workbench of the hydraulic machine, and the polyurethane elastic core body is arranged on the inner side of a prefabricated blank.
2. The device for forming the shell-like member of the continuous variable-section thin-wall cabin section according to claim 1, wherein the working part of the upper punch is in clearance fit with the inner hole of the constant-section die sleeve, and the cross-section size of the inner hole of the connecting part of the constant-section die sleeve and the variable-section necking die is equal.
3. The device for forming the continuous variable-section thin-wall cabin shell-like piece according to claim 2, wherein the constant-section die sleeve is provided with a convex spigot, the variable-section necking die is provided with a concave spigot, and the convex spigot is matched with the concave spigot and is used for preventing the die from being transversely deformed.
4. A device for forming a shell-like body member of a continuous variable-section thin-wall cabin segment according to claim 3, wherein the bottom end of said variable-section necking die is further provided with a through hole having a length of 30mm, and the cross-sectional dimension of said through hole is equal to the minimum hole shape dimension of said variable-section necking die.
5. The device for forming the continuous variable-section thin-wall cabin shell-like piece according to claim 1, wherein the preform is an original material before necking deformation, the polyurethane elastic core is arranged in a through hole of the preform, the preform and the polyurethane elastic core are both arranged in the through hole of the constant-section die sleeve, and the outer contour cross section size of the preform is equal to the inner hole size of the constant-section die sleeve.
6. The device for forming a shell-like member for a thin-walled segment of continuous variable cross-section according to claim 5 wherein said polyurethane elastomer core has a size equal to the size of the inner bore of said preform and has a length greater than the length of the preform.
7. The device for forming the shell-like piece of the continuous variable-section thin-wall cabin section according to claim 1, wherein the working part of the discharging punch is in clearance fit with the through hole at the lower end of the variable-section necking die, and the discharging punch is fixedly connected to an ejection cylinder of the hydraulic machine through a bolt.
8. The forming method of the forming device for the continuous variable cross-section thin-wall cabin shell parts according to any one of claims 1 to 7, which is characterized by comprising the following steps:
s1, preparing a shell preform with a uniform cross section through an extrusion process;
s2, placing the prefabricated blank filled with the polyurethane elastic core body in a constant-section die sleeve, applying downward load to the prefabricated blank and the polyurethane elastic core body along the axial direction through an upper die base plate and an upper punch fixed on a movable beam of a hydraulic press, and carrying out continuous gradual necking forming;
and S3, after the necking forming is finished, applying vertical upward ejection force to the variable cross-section shell and the polyurethane elastic core body in the variable cross-section necking die through an ejection punch fixed on an ejection cylinder of the hydraulic press, and completing the unloading process of the variable cross-section shell.
9. The method for forming a continuous variable cross-section thin-wall cabin shell-like member forming device according to claim 8, wherein in the step S2, the necking forming process is as follows: the prefabricated blank and the polyurethane elastic core body are extruded into a variable-section necking die from a constant-section die sleeve under the action of load, the cross section size is gradually reduced, and continuous gradual necking formation is realized.
10. The method for forming a continuous variable cross-section thin-wall cabin-like shell member forming device according to claim 9, wherein in the necking forming process, a polyurethane elastic core with high elastic modulus is adopted to internally support the preform so as to coordinate necking deformation of the preform and inhibit instability of the thin plate in the necking deformation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410260064.9A CN117840324A (en) | 2024-03-07 | 2024-03-07 | Forming method and device for continuous variable-section thin-wall cabin shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410260064.9A CN117840324A (en) | 2024-03-07 | 2024-03-07 | Forming method and device for continuous variable-section thin-wall cabin shell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117840324A true CN117840324A (en) | 2024-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410260064.9A Pending CN117840324A (en) | 2024-03-07 | 2024-03-07 | Forming method and device for continuous variable-section thin-wall cabin shell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117840324A (en) |
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2024
- 2024-03-07 CN CN202410260064.9A patent/CN117840324A/en active Pending
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