CN115090771A - Hollow structural member and preparation method thereof - Google Patents
Hollow structural member and preparation method thereof Download PDFInfo
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- CN115090771A CN115090771A CN202210676304.4A CN202210676304A CN115090771A CN 115090771 A CN115090771 A CN 115090771A CN 202210676304 A CN202210676304 A CN 202210676304A CN 115090771 A CN115090771 A CN 115090771A
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- inner core
- structural member
- outer skin
- hollow structural
- fixed end
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- 238000002360 preparation method Methods 0.000 title abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 21
- 244000052769 pathogen Species 0.000 claims abstract description 5
- 230000001717 pathogenic effect Effects 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 238000004381 surface treatment Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000003014 reinforcing effect Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 description 9
- 239000010410 layer Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Classifications
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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
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
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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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to a hollow structural member and a preparation method thereof, wherein the hollow structural member comprises inner-layer core cylinders, outer-layer skins and fixed end heads, one or more inner-layer core cylinders are arranged in the outer-layer skins side by side, two ends of each of the outer-layer skins and the inner-layer core cylinders are respectively sealed by the two fixed end heads, and the inner-layer core cylinders are subjected to SPF (specific pathogen free) inflation forming so that the inner-layer core cylinders and the outer-layer skins are mutually attached and are diffused and connected into a whole to form the hollow structural member with reinforcing ribs. Because the shape of the inner core barrel is similar to the final inner cavity separation shape, the deformation can be controlled in a small range, the local thinning is not obvious, and ribs with the wall thickness close to the equal wall thickness can be formed. Compared with the traditional SPF/DB technology, the forming method is not limited by the deformation and thinning of materials, and can realize the forming of the hollow structure of the ultrahigh rib.
Description
Technical Field
The invention relates to a sheet metal forming technology, in particular to a hollow structural member and a preparation method thereof.
Background
Superplastic forming and superplastic forming/diffusion bonding (SPF/DB) technology is a low cost, highly efficient and near-marginless component manufacturing technology that can produce integral hollow structural components in one thermal cycle. Currently, the SPF/DB technology is used as a sheet metal forming process, and mainly forms a single-layer or multi-layer sheet material, and the shape of the formed sheet material is ensured by the profile of a forming mold, and the shape of the inside of the formed cavity is generally similar to the shape of the skin (with or without a reinforcing rib), and the shape of the cavity is naturally formed. The reinforcing ribs in the four-layer structure are formed by two inner core plates through diffusion connection and superplastic forming. Generally, a convex bulge is formed in the middle of the rib due to the existence of a diffusion connection interface, and the thickness of the rib is changed due to deformation and thinning along the rib. This thickness variation is more severe as the rib height increases. Because the thickness of the core plate is limited to a certain extent, when the rib to be formed is higher, the core plate can be broken due to severe thinning in the rib forming process, and parts are scrapped.
Therefore, under the condition that the wall thickness of the inner core plate is determined, the height of the studs of the conventional superplastic forming/diffusion connecting four-layer structure is limited, and the studs with the wall thickness of more than 30-50 times cannot be formed by the conventional SPF/DB four-layer structure. For parts with higher or ultrahigh internal cavities, the core plate with thinner wall thickness cannot be formed, and the thicker core plate increases the weight of the part, so that the advantages of the process are lost. Therefore, how to realize the forming of higher or ultrahigh reinforcing ribs without increasing the weight or the wall thickness of the core plate is a problem to be solved by the prior art. In addition, for a hollow reinforced structure with a higher or ultrahigh internal cavity, the uniformity and uniformity of the wall thickness have great benefits on the performance and predictability of the structure, and how to reduce the deformation of the core plate in the forming process, reduce the wall thickness reduction to the minimum and realize the equal wall thickness or the approximate equal wall thickness is also a place to be improved by the prior art.
Disclosure of Invention
In order to solve the technical problem, the embodiment of the invention provides a hollow structural part and a preparation method thereof.
In a first aspect, an embodiment of the present invention provides a hollow structural member, including an inner core cylinder, an outer skin, and fixing end heads, wherein one or more inner core cylinders are arranged in the outer skin side by side, two ends of an opening of the outer skin and the inner core cylinder are respectively sealed by two fixing end heads, one of the fixing end heads is connected with an air pipe, and the air pipe is communicated with the inner core cylinder; and carrying out SPF (specific pathogen free) inflatable forming on the inner core cylinders by ventilating the air pipes so as to enable the adjacent two inner core cylinders and each inner core cylinder and the outer skin to be mutually attached and to be diffused and connected into a whole.
Further, the outer skin comprises an upper skin and a lower skin, and the upper skin and the lower skin are fastened with each other to form a hollow structure.
Furthermore, the fixed end comprises a first step surface and a second step surface, the first step surface is used for sealing the outer skin, and the second step surface is used for sealing the inner core barrel.
Furthermore, the inner core cylinder is formed by enclosing titanium plates end to end.
Further, the outer contour of the inner core barrel matches the inner contour of the outer skin.
In a second aspect, a method for preparing a hollow structural member is provided, which comprises the following steps:
manufacturing an inner core barrel and a fixed end head according to a part process drawing digifax;
performing the outer skin;
welding a gas pipe to the fixed end;
assembling the inner core barrel, the outer skin and the fixed end head, and welding to form a workpiece to be machined;
and putting the workpiece to be processed into a die, charging, and carrying out SPF/DB forming to form a blank.
Further, the inner core barrel, the outer skin and the fixing end head are subjected to surface treatment before assembly.
And further, carrying out appearance machining on the blank, and removing allowance and flash to obtain the final part.
In conclusion, the inner core cylinders and the outer skin are mutually attached and diffused into a whole by performing SPF (specific pathogen free) inflation forming on the inner core cylinders, so that the hollow structural member with the reinforcing ribs is formed. Because the shape of the inner core barrel is similar to the final inner cavity separation shape, the deformation can be controlled in a small range, the local thinning is not obvious, and ribs with the wall thickness close to the equal wall thickness can be formed. Compared with the traditional SPF/DB technology, the forming method is not limited by material deformation and thinning, can realize the forming of the ultrahigh rib hollow structure, can reduce the deformation of the inner core plate to the maximum extent, reduces the wall thickness thinning, realizes the accurate and controllable uniformity of the thickness of the ribs and the skin, and improves the controllability and the predictability of the performances such as structural rigidity, fatigue and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a hollow structural member according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic illustration of the diffusion bonding of FIG. 1;
FIG. 4 is a schematic process diagram of the diffusion bonding of FIG. 1;
FIG. 5 is a schematic diagram of the completion of the diffusion bond of FIG. 1;
in the figure: 1. an inner core barrel; 2. outer skin; 3. fixing the end head; 4. covering the skin; 5. a lower skin; 6. a first step surface; 7. a second step surface; 8. the trachea.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 and 2, an embodiment of the present invention provides a hollow structural member, including an inner core cylinder 1, an outer skin 2, and fixed end heads 3, wherein one or more inner core cylinders 1 are arranged in the outer skin 2 side by side, two open ends of the outer skin 2 and the inner core cylinder 1 are respectively sealed by two fixed end heads 3, one of the fixed end heads 3 is connected with an air pipe 8, and the air pipe 8 is communicated with the inner core cylinder 1; the inner core cylinders 1 are subjected to SPF (specific pathogen free) inflation forming through ventilation of the air pipes 8, so that two adjacent inner core cylinders 1 and each inner core cylinder 1 and the outer skin 2 are mutually attached and are in diffusion connection to form a whole, and a hollow structural part with reinforcing ribs is formed. The number of ribs and the height of the ribs can be adjusted by changing the shape and number of the inner core barrel 1. Because the shape of the inner core barrel 1 is similar to the final inner cavity separation shape, the deformation can be controlled in a small range, the local thinning is not obvious, and ribs with the wall thickness close to the equal wall thickness can be formed. Compared with the traditional SPF/DB technology, the forming method is not limited by material deformation and thinning, can realize the forming of the ultrahigh rib hollow structure, can reduce the deformation of the inner core plate to the maximum extent, reduces the wall thickness thinning, realizes the accurate and controllable uniformity of the thickness of the ribs and the skin, and improves the controllability and the predictability of the performances such as structural rigidity, fatigue and the like.
Referring to fig. 1, as a preferred embodiment, the outer skin 2 includes an upper skin 4 and a lower skin 5, wherein the upper skin 4 and the lower skin 5 may be fabricated by performing, and then the upper skin 4 and the lower skin 5 are oppositely disposed and then welded, so that the upper skin 4 and the lower skin 5 are fastened to each other to form a hollow structure.
Referring to fig. 2, as a preferred embodiment, the fixing end 3 includes a first step surface 6 and a second step surface 7, the first step surface 6 is used for sealing the outer skin 2, and then welding is performed to ensure sealing, so that the outer skin 2 and the first step surface 6 form a first cavity structure, the second step surface 7 is used for sealing the inner core barrel 1, and then welding is performed to ensure sealing, so that the inner core barrel 1 and the second step surface 7 form a second cavity structure, and the inner core barrels 1 and the outer skin 2 are attached to each other by ventilating the second cavity structure and are diffusion-connected into a whole to form a hollow structural member with reinforcing ribs.
Referring to fig. 1 and 2, as a preferred embodiment, the inner core tube 1 is formed by enclosing titanium plates end to end, wherein the end-to-end connection can be welded, and the continuity and compactness of the welding seam are ensured.
Referring to fig. 1 and 2, as a preferred embodiment, the outer contour of the inner core tube 1 matches the inner contour of the outer skin 2 to ensure that the outer shape of the inner core tube 1 is similar to the final shape of the inner cavity separation, so that the deformation can be controlled in a small range, the local thinning is not obvious, and ribs with approximately equal wall thickness can be formed.
Referring to fig. 1 to 5, in a second aspect, a method for manufacturing a hollow structural member is provided, including the steps of:
manufacturing an inner core barrel 1 and a fixed end head 3 according to a part process drawing digifax;
the inner core barrel 1 is formed by enclosing titanium plates end to end, wherein the end-to-end joint can be welded, and the continuity and compactness of a welding seam are ensured;
the fixed end 3 comprises a first step surface 6 and a second step surface 7, the first step surface 6 is matched with the opening of the outer skin 2, and the second step surface 7 is matched with the opening of the inner core barrel 1.
Performing an outer skin 2, wherein the outer skin 2 comprises an upper skin 4 and a lower skin 5, and welding the upper skin 4 and the lower skin 5 after the upper skin 4 and the lower skin 5 are oppositely arranged to combine the upper skin 4 and the lower skin 5 to form a hollow structure;
welding an air pipe 8 to the fixed end 3, wherein the air pipe 8 is communicated with the inner core barrel 1, so that the air can be conveniently ventilated in the inner core barrel 1;
assembling an inner core cylinder 1, an outer skin 2 and fixed end heads 3, namely arranging the inner core cylinder 1 in the outer skin 2 side by side, sealing two ends of the outer skin 2 and two ends of the inner core cylinder 1 by the two fixed end heads 3 respectively, and welding to form a workpiece to be machined;
putting the workpiece to be processed into a die, charging the die, and carrying out SPF/DB forming, namely, carrying out SPF inflation forming on the inner core cylinders 1 to enable the inner core cylinders 1 and the outer skin 2 to be mutually attached and to be diffused and connected into a whole to form a blank.
In a preferred embodiment, the inner core barrel 1, the outer skin 2 and the fixing end head 3 are subjected to surface treatment before assembly, so that impurities among diffusion connection can be avoided to cause forming defects when SPF air inflation forming is carried out.
In a preferred embodiment, the blank is subjected to a contour machining process to remove a margin and a flash, thereby obtaining a final part.
It should be understood that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment is described with emphasis on the differences from the other embodiments. For embodiments of the method, reference is made to the description of the apparatus embodiments in part. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. A hollow structural member characterized by: the device comprises an inner core cylinder, an outer skin and fixed end heads, wherein one or more inner core cylinders are arranged in the outer skin side by side, two ends of an opening of the outer skin and two ends of an opening of the inner core cylinder are respectively sealed by the two fixed end heads, one of the fixed end heads is connected with an air pipe, and the air pipe is communicated with the inner core cylinder;
and carrying out SPF (specific pathogen free) inflatable forming on the inner core cylinders by ventilating the air pipes so as to enable the adjacent two inner core cylinders and each inner core cylinder and the outer skin to be mutually attached and to be diffused and connected into a whole.
2. A hollow structural member according to claim 1 wherein: the outer skin comprises an upper skin and a lower skin, and the upper skin and the lower skin are mutually buckled to form a hollow structure.
3. A hollow structural member according to claim 1 wherein: the fixed end comprises a first step surface and a second step surface, the first step surface is used for sealing the outer skin, and the second step surface is used for sealing the inner core barrel.
4. A hollow structural member according to claim 1 wherein: the inner core cylinder is formed by enclosing titanium plates end to end.
5. A hollow structural member according to claim 1 wherein: the outer contour of the inner core barrel is matched with the inner contour of the outer skin.
6. A method for preparing a hollow structural member is characterized by comprising the following steps: the method comprises the following steps:
manufacturing an inner core barrel and a fixed end head according to a part process drawing digifax;
performing the outer skin;
welding a gas pipe to the fixed end;
assembling the inner core barrel, the outer skin and the fixed end head, and welding to form a workpiece to be machined;
and putting the workpiece to be processed into a die, charging, and carrying out SPF/DB forming to form a blank.
7. The method for manufacturing a hollow structural member according to claim 6, wherein: the method also comprises the step of carrying out surface treatment on the inner core cylinder, the outer skin and the fixing end head before assembly.
8. The method for manufacturing a hollow structural member according to claim 6, wherein: and (5) carrying out appearance processing on the blank, and removing allowance and flash to obtain the final part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210676304.4A CN115090771A (en) | 2022-06-15 | 2022-06-15 | Hollow structural member and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210676304.4A CN115090771A (en) | 2022-06-15 | 2022-06-15 | Hollow structural member and preparation method thereof |
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| CN115090771A true CN115090771A (en) | 2022-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210676304.4A Pending CN115090771A (en) | 2022-06-15 | 2022-06-15 | Hollow structural member and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114433702A (en) * | 2021-12-27 | 2022-05-06 | 西安泰金工业电化学技术有限公司 | Silver-plated spinning titanium cylinder with good conductivity |
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| CN107009096A (en) * | 2017-04-12 | 2017-08-04 | 哈尔滨工业大学 | A kind of method that utilization closed cross-section pipe manufactures multi-layer hollow structure |
| CN109158842A (en) * | 2018-10-31 | 2019-01-08 | 北京普惠三航科技有限公司 | The processing technology of aerofoil is reinforced in a kind of titanium alloy lightweight |
| CN109955042A (en) * | 2019-03-28 | 2019-07-02 | 中国航空制造技术研究院 | The preparation method of titanium alloy hollow structure |
| CN113290198A (en) * | 2021-04-27 | 2021-08-24 | 南京航空航天大学 | Method for preparing hollow integral structure by using pipe |
| CN114227164A (en) * | 2021-12-16 | 2022-03-25 | 航天海鹰(哈尔滨)钛业有限公司 | Manufacturing method for light-weight missile wing superplastic forming |
-
2022
- 2022-06-15 CN CN202210676304.4A patent/CN115090771A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107009096A (en) * | 2017-04-12 | 2017-08-04 | 哈尔滨工业大学 | A kind of method that utilization closed cross-section pipe manufactures multi-layer hollow structure |
| CN109158842A (en) * | 2018-10-31 | 2019-01-08 | 北京普惠三航科技有限公司 | The processing technology of aerofoil is reinforced in a kind of titanium alloy lightweight |
| CN109955042A (en) * | 2019-03-28 | 2019-07-02 | 中国航空制造技术研究院 | The preparation method of titanium alloy hollow structure |
| CN113290198A (en) * | 2021-04-27 | 2021-08-24 | 南京航空航天大学 | Method for preparing hollow integral structure by using pipe |
| CN114227164A (en) * | 2021-12-16 | 2022-03-25 | 航天海鹰(哈尔滨)钛业有限公司 | Manufacturing method for light-weight missile wing superplastic forming |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114433702A (en) * | 2021-12-27 | 2022-05-06 | 西安泰金工业电化学技术有限公司 | Silver-plated spinning titanium cylinder with good conductivity |
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