CN112247303A - Machining method for positioning and assembling bent pipe - Google Patents
Machining method for positioning and assembling bent pipe Download PDFInfo
- Publication number
- CN112247303A CN112247303A CN202011034782.2A CN202011034782A CN112247303A CN 112247303 A CN112247303 A CN 112247303A CN 202011034782 A CN202011034782 A CN 202011034782A CN 112247303 A CN112247303 A CN 112247303A
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- China
- Prior art keywords
- elbow
- inclined hole
- bent pipe
- workpiece
- bent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/14—Soldering, e.g. brazing, or unsoldering specially adapted for soldering seams
- B23K1/18—Soldering, e.g. brazing, or unsoldering specially adapted for soldering seams circumferential seams, e.g. of shells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
The invention discloses a processing method for positioning and assembling a bent pipe, which comprises the following steps: on a workpiece provided with a through hole and communicated with the inclined hole, carrying out reaming treatment on the inclined hole from the tail end of the inclined hole, so that the aperture of the reamed inclined hole is matched with the outer diameter of the elbow sleeve; extending the bent pipe into the inclined hole from the through hole of the workpiece, so that the straight section of the bent pipe is positioned in the through hole of the workpiece, and the bent section of the bent pipe is positioned in the inclined hole of the workpiece after reaming; paste brazing filler metal is preset in a brazing filler metal groove reserved in the outer wall and the inner wall of the elbow pipe sleeve, the inner diameter of the elbow pipe sleeve is matched with the outer diameter of a bent section of the elbow pipe, and the outer diameter of the elbow pipe sleeve is matched with the inner diameter of the inclined hole after reaming; sleeving a bent pipe sleeve on the bent section of the bent pipe from the tail end of the inclined hole to ensure that the bent pipe sleeve blocks a circular seam between the bent section of the bent pipe and the inclined hole after reaming; and putting the workpiece into a vacuum furnace, performing vacuum brazing, cooling and discharging. The invention solves the technical problem of positioning and assembling the bent pipe and simultaneously ensures the integrity of the workpiece.
Description
Technical Field
The invention belongs to the technical field of aerospace equipment processing, and relates to a processing method for positioning and assembling a bent pipe.
Background
The elbow pipe is usually required to be installed on an aerospace equipment workpiece, as shown in fig. 1, the elbow pipe consists of a straight section and a bent section, a through hole and an inclined hole for assembling the elbow pipe are formed in the workpiece, the outer pipe has the bent section, the difficulty is high during assembly, an operator is difficult to accurately insert the bent pipe into the inclined hole in the workpiece through the hole in the workpiece, and the assembly process of the elbow pipe is inoperable and difficult to realize.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a machining method for positioning and assembling a bent pipe, so that the assembly difficulty of the bent pipe is reduced, and the integrity of a workpiece is ensured.
The invention is realized by the following technical scheme:
a machining method for positioning and assembling a bent pipe comprises the following steps:
(1) on a workpiece provided with a through hole and an inclined hole which are communicated, carrying out reaming treatment on the inclined hole from the tail end of the inclined hole, so that the aperture of the reamed inclined hole is matched with the outer diameter of the elbow sleeve;
(2) extending the bent pipe into the inclined hole from the through hole of the workpiece, so that the straight section of the bent pipe is positioned in the through hole of the workpiece, and the bent section of the bent pipe is positioned in the inclined hole of the workpiece after reaming;
(3) paste brazing filler metal is preset in a brazing filler metal groove reserved in the outer wall and the inner wall of the elbow pipe sleeve, and the inner diameter of the elbow pipe sleeve is matched with the outer diameter of the elbow section of the elbow pipe;
(4) sleeving a bent pipe sleeve on the bent section of the bent pipe from the tail end of the inclined hole to ensure that the bent pipe sleeve blocks a circular seam between the bent section of the bent pipe and the inclined hole after reaming;
(5) and putting the workpiece into a vacuum furnace, performing vacuum brazing, cooling and discharging.
Furthermore, the length of the elbow sleeve is one half or one third of the length of the elbow bending section.
Furthermore, the paste solder is HBNi82 CrSiB.
Further, the vacuum brazing operation in the step (5) comprises the following steps:
(1) vacuumizing the vacuum furnace to make the vacuum degree in the furnace reach 1X 10-2Pa；
(2) Filling high-purity argon into the furnace to ensure that the vacuum degree in the furnace is 50-150 Pa;
(3) heating to 350-450 ℃ at the speed of 30 ℃/h, and keeping the temperature for 60 min;
(4) heating to 600-700 ℃ at the speed of 60 ℃/h, carrying out partial pressure of 5pa, and carrying out heat preservation for 60 min;
(5) heating to 800-900 ℃ at the speed of 90 ℃/h, carrying out partial pressure of 30pa, and carrying out heat preservation for 240 min;
(6) heating to 1020-1050 ℃ at the speed of 100 ℃/h, carrying out vacuum brazing at the partial pressure of 50pa for 4-6 h.
Further, after the vacuum brazing is finished, the temperature is controlled and cooled to 700 ℃ at the speed of 90 ℃/h, the pressure dividing valve is closed, the furnace vacuum cooling gas is cooled to 200 ℃ along with the furnace vacuum cooling gas, and high-purity argon is filled, so that the pressure in the furnace reaches 9 multiplied by 104And Pa, discharging the structural part after the structural part is cooled to 65 ℃.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a processing method for positioning and assembling a bent pipe, which solves the assembly problem of the bent pipe by reaming first and then brazing and adopting a method of plugging a circular seam by a bent pipe sleeve. In the actual processing process, because an operator difficultly inserts the bent elbow into the inclined hole through the inclined hole accurately, the elbow is extremely difficult to assemble, and a workpiece is easily damaged during forced assembly; the invention overcomes the technical bias that people only consider solving the technical problems of the bent pipe, firstly carries out reaming treatment on the inclined hole on the workpiece, so that the bent pipe can be easily assembled in the inclined hole of the workpiece, and then adopts the bent pipe sleeve to seal the annular seam between the bent section of the bent pipe and the reamed inclined hole, thereby ensuring the integrity of the workpiece.
According to the invention, a brazing filler metal groove is reserved on the inner wall and the outer wall of the elbow pipe sleeve, a paste-shaped brazing filler metal is preset in the brazing filler metal groove, and the elbow pipe sleeve is respectively welded with the inner wall of the inclined hole of the workpiece and the bent section of the elbow pipe into an integral structure through vacuum brazing; in order not to influence the overall performance of the workpiece, the bent pipe sleeve is brazed on the bent pipe through vacuum brazing, so that the bent pipe sleeve is welded with the workpiece and the bent pipe respectively to form an integral structure. The invention solves the assembly problem of the elbow pipe through simple structural change, does not influence the performance of the workpiece, ensures the integrity of the workpiece, and has the shape correction function on the pipeline of the elbow pipe when the elbow pipe sleeve is assembled.
Drawings
FIG. 1 is a schematic view of a prior art elbow fitting on a workpiece;
FIG. 2 is a view of the positioning assembly of the elbow on the workpiece according to an embodiment of the invention;
wherein, 1 is a workpiece, 2 is a through hole, 3 is an inclined hole, 4 is a bent pipe, and 5 is a bent pipe sleeve.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
A machining method for positioning and assembling a bent pipe comprises the following steps:
(1) on a workpiece 1 provided with a through hole 2 and an inclined hole 3 which are communicated, reaming the inclined hole 3 from the tail end of the inclined hole 3 to ensure that the aperture of the reamed inclined hole 3 is matched with the outer diameter of a bent pipe sleeve 5;
(2) extending the bent pipe 3 into the inclined hole 3 from the through hole 2 of the workpiece 1, so that the straight section of the bent pipe 3 is positioned in the through hole 2 of the workpiece 1, and the bent section of the bent pipe 3 is positioned in the inclined hole 3 of the workpiece 1 after reaming;
(3) paste brazing filler metal is preset in a brazing filler metal groove reserved in the outer wall and the inner wall of the bent pipe sleeve 4, the inner diameter of the bent pipe sleeve 4 is matched with the outer diameter of a bent section of the bent pipe 3, and the outer diameter of the bent pipe sleeve 4 is matched with the aperture of the inclined hole 3 after reaming;
(4) sleeving the bent pipe sleeve 4 on the bent section of the bent pipe 3 from the tail end of the inclined hole 3, and ensuring that the bent pipe sleeve 4 blocks a circular seam between the bent section of the bent pipe 3 and the inclined hole 3 after reaming;
(5) and putting the workpiece 1 into a vacuum furnace, performing vacuum brazing, cooling and discharging.
Furthermore, the length of the elbow sleeve 4 is one half or one third of the length of the bending section of the elbow 3.
Referring specifically to fig. 2, a positioning assembly diagram of the elbow on the workpiece according to the embodiment of the present invention is shown. Because the bent pipe 3 consists of a straight section and a bent section, the difficulty is high when the bent pipe 3 is assembled on a workpiece in the prior art, and an operator difficultly inserts the bent pipe 3 into the inclined hole 3 on the workpiece 1 through the through hole 2 on the workpiece 1 accurately, so that the inclined hole 3 is reamed at the tail end of the inclined hole 3 on the workpiece 1, the aperture of the inclined hole 3 is enlarged, and the bent pipe 3 can have enough space to be inserted into the inclined hole 3; extending the elbow 3 into the inclined hole 3 of the workpiece 1 from the through hole 2 of the workpiece 1, so that the straight pipe section of the elbow 3 is positioned in the through hole 2 of the workpiece 1, and the bent section of the elbow 3 is positioned in the inclined hole 3 of the workpiece 1; after the elbow 3 is assembled in the inclined hole 3, in order to position the bending section of the elbow 3, a elbow sleeve 4 is sleeved outside the elbow 3, the inner diameter of the elbow sleeve 4 is matched with the outer diameter of the bending section of the elbow 3, and the outer diameter of the elbow sleeve 4 is matched with the inner diameter of the inclined hole 3 after reaming; a brazing filler metal groove is reserved on the outer wall and the inner wall of the elbow pipe sleeve 4, and before the elbow pipe sleeve 4 is sleeved into the elbow pipe 3, a paste brazing filler metal is preset in the brazing filler metal groove; sleeving the bent pipe sleeve 4 on the bent section of the bent pipe 3 from the tail end of the inclined hole 3, and ensuring that the bent pipe sleeve 4 blocks a circular seam between the bent section of the bent pipe 3 and the inclined hole 3 after reaming; and finally, putting the workpiece 1 into a vacuum furnace, performing vacuum brazing, cooling and discharging, and realizing the positioning assembly of the bent pipe 3.
Furthermore, the paste solder is HBNi82 CrSiB.
Further, the vacuum brazing operation in the step (5) comprises the following steps:
(1) vacuumizing the vacuum furnace to make the vacuum degree in the furnace reach 1X 10-2Pa；
(2) Filling high-purity argon into the furnace to ensure that the vacuum degree in the furnace is 50-150 Pa;
(3) heating to 350-450 ℃ at the speed of 30 ℃/h, and keeping the temperature for 60 min;
(4) heating to 600-700 ℃ at the speed of 60 ℃/h, carrying out partial pressure of 5pa, and carrying out heat preservation for 60 min;
(5) heating to 800-900 ℃ at the speed of 90 ℃/h, carrying out partial pressure of 30pa, and carrying out heat preservation for 240 min;
(6) heating to 1020-1050 ℃ at the speed of 100 ℃/h, carrying out vacuum brazing at the partial pressure of 50pa for 4-6 h.
Specifically, during vacuum brazing, a furnace door is opened, a structural part is placed in an effective uniform temperature zone in a vacuum brazing furnace, and the furnace door is immediately closed; vacuumizing to make the vacuum degree in the furnace reach 1X 10-2Pa, preventing Mn and Cu elements in the brazing filler metal from volatilizing; filling high-purity argon into the vacuum furnace to ensure that the vacuum degree in the furnace is 50-150 Pa; and starting temperature programming, and starting vacuum brazing when the temperature in the furnace rises to 1020-1050 ℃.
Further, after the vacuum brazing is finished, the temperature is controlled and cooled to 700 ℃ at the speed of 90 ℃/h, the pressure dividing valve is closed, the furnace vacuum cooling gas is cooled to 200 ℃ along with the furnace vacuum cooling gas, and high-purity argon is filled, so that the pressure in the furnace reaches 9 multiplied by 104And Pa, discharging the structural part after the structural part is cooled to 65 ℃.
According to the technical scheme, the invention provides the machining method for positioning and assembling the bent pipe, and the method for plugging the annular seam by using the bent pipe sleeve 5 is adopted by reaming first and then brazing, so that the assembling problem of the bent pipe 4 is solved. In the actual processing process, because an operator difficultly inserts the bent elbow 4 into the inclined hole 3 through the inclined hole 3 accurately, the assembly of the elbow 4 is extremely difficult, and the workpiece 1 is easily damaged during forced assembly; the invention overcomes the technical bias that people only consider solving the technical problems of the elbow 4, firstly, the inclined hole on the workpiece 1 is reamed, so that the elbow 4 can be easily assembled in the inclined hole of the workpiece 1, and then the annular seam between the bent section of the elbow 4 and the reamed inclined hole 3 is sealed by adopting the elbow sleeve 5, thereby ensuring the integrity of the workpiece 1.
According to the invention, a brazing filler metal groove is reserved on the inner wall and the outer wall of a bent pipe sleeve 5, a paste-shaped brazing filler metal is preset in the brazing filler metal groove, and the bent pipe sleeve 5 is respectively welded with the inner wall of an inclined hole of a workpiece 1 and a bent section of a bent pipe 4 into an integral structure through vacuum brazing; in order to not influence the overall performance of the workpiece 1, the invention brazes the elbow pipe sleeve 5 on the elbow pipe through vacuum brazing, so that the elbow pipe sleeve 5 is respectively welded with the workpiece 1 and the elbow pipe 4 to form an integral structure, the performance of the workpiece 1 is not influenced, and the integrity of the workpiece 1 is ensured. The invention solves the assembly problem of the elbow 4 through simple structural change, does not influence the performance of the workpiece 1, ensures the integrity of the workpiece 1, and the elbow sleeve 5 has the function of correcting the shape of the pipeline of the elbow 4 during assembly.
The embodiments given above are preferable examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical characteristics of the technical scheme of the invention by a person skilled in the art belong to the protection scope of the invention.
Claims (5)
1. A machining method for positioning and assembling a bent pipe is characterized by comprising the following steps:
(1) on a workpiece provided with a through hole and an inclined hole which are communicated, carrying out reaming treatment on the inclined hole from the tail end of the inclined hole, so that the aperture of the reamed inclined hole is matched with the outer diameter of the elbow sleeve;
(2) extending the bent pipe into the inclined hole from the through hole of the workpiece, so that the straight section of the bent pipe is positioned in the through hole of the workpiece, and the bent section of the bent pipe is positioned in the inclined hole of the workpiece after reaming;
(3) paste brazing filler metal is preset in a brazing filler metal groove reserved in the outer wall and the inner wall of the elbow pipe sleeve, and the inner diameter of the elbow pipe sleeve is matched with the outer diameter of the elbow section of the elbow pipe;
(4) sleeving a bent pipe sleeve on the bent section of the bent pipe from the tail end of the inclined hole to ensure that the bent pipe sleeve blocks a circular seam between the bent section of the bent pipe and the inclined hole after reaming;
(5) and putting the workpiece into a vacuum furnace, performing vacuum brazing, cooling and discharging.
2. The method according to claim 1, wherein the length of the elbow sleeve is one-half or one-third of the length of the elbow segment.
3. The method of manufacturing an elbow positioning assembly according to claim 1, wherein the paste brazing filler metal is HBNi82 CrSiB.
4. The method for manufacturing the elbow positioning assembly according to claim 1, wherein the vacuum brazing operation in the step (5) comprises the following steps:
(1) vacuumizing the vacuum furnace to make the vacuum degree in the furnace reach 1X 10-2Pa；
(2) Filling high-purity argon into the furnace to ensure that the vacuum degree in the furnace is 50-150 Pa;
(3) heating to 350-450 ℃ at the speed of 30 ℃/h, and keeping the temperature for 60 min;
(4) heating to 600-700 ℃ at the speed of 60 ℃/h, carrying out partial pressure of 5pa, and carrying out heat preservation for 60 min;
(5) heating to 800-900 ℃ at the speed of 90 ℃/h, carrying out partial pressure of 30pa, and carrying out heat preservation for 240 min;
(6) heating to 1020-1050 ℃ at the speed of 100 ℃/h, carrying out vacuum brazing at the partial pressure of 50pa for 4-6 h.
5. The method according to claim 4, wherein the vacuum brazing is completed, the temperature is controlled and cooled at a rate of 90 ℃/h to 700 ℃, the pressure dividing valve is closed, the furnace vacuum cooling gas is cooled to 200 ℃, and high-purity argon is filled in the furnace vacuum cooling gas to ensure that the pressure in the furnace reaches 9 x 104And Pa, discharging the structural part after the structural part is cooled to 65 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011034782.2A CN112247303A (en) | 2020-09-27 | 2020-09-27 | Machining method for positioning and assembling bent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011034782.2A CN112247303A (en) | 2020-09-27 | 2020-09-27 | Machining method for positioning and assembling bent pipe |
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| Publication Number | Publication Date |
|---|---|
| CN112247303A true CN112247303A (en) | 2021-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011034782.2A Pending CN112247303A (en) | 2020-09-27 | 2020-09-27 | Machining method for positioning and assembling bent pipe |
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| CN (1) | CN112247303A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113523735A (en) * | 2021-09-01 | 2021-10-22 | 西安远航真空钎焊技术有限公司 | Preparation method of injector |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1306255A (en) * | 1969-02-26 | 1973-02-07 | ||
| DE102009011090A1 (en) * | 2009-03-03 | 2010-09-09 | Olympus Winter & Ibe Gmbh | Soldering pipe into hole, by inserting pipe enclosed in laminate of solder material and exothermic reactive material layers into hole and expanding pipe to initiate exothermic reaction |
| CN102581414A (en) * | 2012-03-16 | 2012-07-18 | 李明雨 | Method for brazing copper aluminum tubes without aid of brazing flux |
| CN103846638A (en) * | 2012-11-30 | 2014-06-11 | Lg电子株式会社 | Heat exchanger and method of manufacturing the same |
| CN108581396A (en) * | 2018-06-21 | 2018-09-28 | 湖北三江航天江北机械工程有限公司 | Using the showerhead injector processing method of fine duct |
| CN109834356A (en) * | 2019-03-08 | 2019-06-04 | 任耀文 | A kind of production method of complexity dual alloy cone structure |
-
2020
- 2020-09-27 CN CN202011034782.2A patent/CN112247303A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1306255A (en) * | 1969-02-26 | 1973-02-07 | ||
| DE102009011090A1 (en) * | 2009-03-03 | 2010-09-09 | Olympus Winter & Ibe Gmbh | Soldering pipe into hole, by inserting pipe enclosed in laminate of solder material and exothermic reactive material layers into hole and expanding pipe to initiate exothermic reaction |
| CN102581414A (en) * | 2012-03-16 | 2012-07-18 | 李明雨 | Method for brazing copper aluminum tubes without aid of brazing flux |
| CN103846638A (en) * | 2012-11-30 | 2014-06-11 | Lg电子株式会社 | Heat exchanger and method of manufacturing the same |
| CN108581396A (en) * | 2018-06-21 | 2018-09-28 | 湖北三江航天江北机械工程有限公司 | Using the showerhead injector processing method of fine duct |
| CN109834356A (en) * | 2019-03-08 | 2019-06-04 | 任耀文 | A kind of production method of complexity dual alloy cone structure |
Non-Patent Citations (1)
| Title |
|---|
| 苌葆荃: "导管焊接接头设计", 《火箭推进》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113523735A (en) * | 2021-09-01 | 2021-10-22 | 西安远航真空钎焊技术有限公司 | Preparation method of injector |
| CN113523735B (en) * | 2021-09-01 | 2022-07-22 | 西安远航真空钎焊技术有限公司 | Preparation method of injector |
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Application publication date: 20210122 |