CN114029575A - Segmented brazing method and segmented brazing device - Google Patents
Segmented brazing method and segmented brazing device Download PDFInfo
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- CN114029575A CN114029575A CN202111357187.7A CN202111357187A CN114029575A CN 114029575 A CN114029575 A CN 114029575A CN 202111357187 A CN202111357187 A CN 202111357187A CN 114029575 A CN114029575 A CN 114029575A
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- brazing
- section
- preheating
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- cooling
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- 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
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
Abstract
The invention discloses a sectional brazing method and a sectional brazing device, wherein the sectional brazing method comprises the following steps: s1, conveying the workpiece to be welded to a preheating section, and performing preheating treatment in the sealed preheating section to increase the temperature of the workpiece to 450-550 ℃; s2, conveying the preheated workpiece to a brazing section, and performing brazing treatment in the sealed brazing section; the oxygen content in the brazing section is lower than 100 PPM; and S3, conveying the workpieces subjected to brazing to a cooling section for cooling. The sectional brazing method has the beneficial effects that: the independent preheating section and the brazing section are arranged, so that the workpieces are preheated, brazed and cooled in a sectional mode, and the brazing connection of the workpieces with various sizes is met.
Description
Technical Field
The invention relates to the technical field of brazing, in particular to a segmented brazing method and a segmented brazing device.
Background
With the general rising of the price of metal raw materials, the cost of various materials used in the heat dissipation industry rises, and aluminum materials are low in price and large in storage capacity, so that the aluminum materials gradually become the first-choice target for replacing materials in the industry. Aluminum brazing is also gaining more and more acceptance in the industry as a reliable connection mode for aluminum materials.
Along with the widening of the demand surface of aluminum products, various radiator schemes need to be connected through brazing to form a sealed cavity. And the increase of heat dissipation power, the original mesh belt type brazing furnace can not meet the welding of a radiator with large and heavy workpieces. The high cost and low productivity of vacuum brazing also do not meet the large welding requirements.
Disclosure of Invention
The invention aims to provide a sectional brazing method and a sectional brazing device.
The technical scheme adopted by the invention for solving the technical problems is as follows: a segmented brazing method is provided, comprising the steps of:
s1, conveying the workpiece to be welded to a preheating section, and performing preheating treatment in the sealed preheating section to increase the temperature of the workpiece to 450-550 ℃;
s2, conveying the preheated workpiece to a brazing section, and performing brazing treatment in the sealed brazing section; the oxygen content in the brazing section is lower than 100 PPM;
and S3, conveying the workpieces subjected to brazing to a cooling section for cooling.
Preferably, in step S1, the temperature rise rate of the workpiece in the preheating section is 20-40 ℃/min.
Preferably, in step S1, the oxygen content in the preheating section is reduced by charging nitrogen gas into the preheating section and discharging air from the preheating section.
Preferably, in step S2, the brazing temperature in the brazing section is 550-630 ℃, and the temperature uniformity of the workpiece is +/-3 ℃.
Preferably, in step S2, the temperature is increased to the brazing temperature within the brazing section at a ramp rate of 10-20 ℃/min.
Preferably, in step S3, the cooling rate of the cooling section is 30-50 deg.C/min.
Preferably, in step S3, the temperature of the brazed workpiece is reduced by air cooling.
The invention also provides a sectional brazing device, which comprises a conveying mechanism, a preheating section for preheating the workpiece to be welded and a brazing section for brazing the preheated workpiece;
the conveying mechanism is arranged between the preheating section and the brazing section and is used for conveying the workpieces to the preheating section and the brazing section in sequence.
Preferably, the segmented brazing device further comprises a cooling segment for cooling the brazed workpieces; the transfer mechanism also extends to the cooling section to transfer the workpiece from the brazing section to the cooling section.
Preferably, the preheating section comprises a preheating housing, a first heating element disposed within the preheating housing; the brazing section comprises a brazing shell and a second heating element arranged in the brazing shell;
a first partition door capable of being opened and closed is arranged on the inlet side of the preheating shell, and the workpiece enters the preheating shell through the first partition door; the outlet side of the preheating shell and the inlet side of the brazing shell are provided with second partition doors capable of being opened and closed, and the workpieces enter the brazing shell from the preheating shell through the second partition doors;
and the outlet side of the brazing shell is provided with a third partition door capable of opening and closing.
The invention has the beneficial effects that: the independent preheating section and the brazing section are arranged, so that the workpieces are preheated, brazed and cooled in a sectional mode, and the brazing connection of the workpieces with various sizes is met.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural view of a segment brazing apparatus according to an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The sectional brazing device is used for brazing the workpiece, and sequentially preheats, brazes and cools the workpiece in a sectional manner. As shown in fig. 1, the staged brazing apparatus of the present invention may include a preheating stage 10, a brazing stage 20, a cooling stage 30, and a transfer mechanism 40. The transfer mechanism 40 is disposed between the preheating stage 10, the brazing stage 20, and the cooling stage 30, and transfers the work pieces to the preheating stage 10, the brazing stage 20, and the cooling stage 30 in this order.
The preheating section 10 is used for preheating a workpiece to be welded, so that the workpiece is heated to a predetermined temperature and then subjected to subsequent brazing. The brazing section 20 is used for brazing the preheated workpiece, that is: so that the brazing filler metal placed at the required welding position on the workpiece is melted and freely filled in the welding gap through capillary action. The cooling section 30 is used for cooling the brazed workpiece, and is convenient to take out and transfer.
The transmission mechanism 40 is used for conveying the workpieces and may include a plurality of rollers arranged at intervals, and the plurality of rollers may be divided into a plurality of groups, one group is located in the preheating section 10, one group is located in the brazing section 20, one group is located in the cooling section 30, and a part of the rollers is located outside the preheating section 10 and the cooling section 30. The workpieces to be welded are placed on the rollers outside the preheating section 10, and the workpieces on the rollers can be conveyed to the rollers in the preheating section 10 through the rotation of the rollers; after the roller in the preheating section 10 rotates, the workpiece on the roller can be conveyed into the brazing section 20; the rollers in the brazing section 20 can convey the workpieces thereon to the cooling section 30 after rotating; after the rollers in the cooling section 30 rotate, the workpieces on the rollers can be sent out to the rollers outside the cooling section 30, so that the workpieces are transferred among the preheating section 10, the brazing section 20 and the cooling section 30, and the preheating, brazing and cooling processes are completed.
In addition, the rollers are arranged in groups, so that the rollers in each section (the preheating section 10, the brazing section 20 and the cooling section 30) can roll relatively independently, namely can rotate at different times or rotate at different speeds, and workpieces can be conveyed according to different processing time of each section.
Or, the transmission mechanism 40 may further include a transmission belt wound around all the rollers, and the transmission belt may drive all the rollers to synchronously rotate, so as to continuously process the workpiece.
Specifically, the preheating section 10 may include a preheating housing, a first heating element disposed within the preheating housing. After being electrified and heated, the first heating element heats the inner cavity of the preheating shell, so that the temperature of the workpieces in the preheating section 10 is raised to a preset temperature, and the preset temperature is lower than the melting temperature of the brazing filler metal on the workpieces. The first heating element is a heating element with controllable heating temperature of 100-600 ℃ so as to preheat workpieces of various types and sizes.
The opposite sides of the preheating section 10 form an inlet side and an outlet side, respectively. The inlet side of the preheating section 10 is provided with a first partition door 51 which can be opened and closed, the opening and closing of the inlet side of the preheating section 10 are realized by the opening and closing of the first partition door 51, and the workpieces enter the preheating shell through the opened first partition door 51. The outlet side of the preheating section 10 faces the brazing section 20 and can be connected with the brazing section 20; the outlet side is provided with a second partition door 52 which can be opened and closed, and the second partition door 52 after being opened can communicate the preheating section 10 and the brazing section 20, so that the workpieces can enter the brazing section 20 from the preheating section 10.
The preheating shell can be also provided with vent holes for introducing nitrogen into the preheating shell, and simultaneously, the air in the preheating shell is discharged, so that the oxygen content in the preheating shell is reduced, and the oxidation of oxygen on the brazing filler metal is avoided.
The preheating section 10 may further include a fan 11 disposed in the preheating housing for driving the gas to be uniformly distributed in the preheating housing, thereby achieving uniform temperature in the preheating housing.
The braze segment 20 can include a braze shell, a second heating element disposed within the braze shell. After the second heating element is electrified and heated, the inner cavity of the brazing shell is heated, and then the temperature of the workpiece in the brazing section 20 is raised to the brazing temperature; at the brazing temperature, the brazing filler metal on the workpiece is melted and freely filled in the welding gap through capillary action. The second heating element is a heating element with controllable heating temperature of 100-750 ℃ so as to meet the requirements of brazing workpieces of various types and sizes.
Opposite sides of the brazing segment 20 form an inlet side and an outlet side, respectively. The inlet side of the soldering section 20 faces the preheating section 10 and may be provided with a shut-off door controlling the opening and closing of the inlet side. In the embodiment shown in fig. 1, the inlet side of the brazing section 20 and the outlet side of the preheating section 10 share the second partition door 52, and when the second partition door 52 is opened, the preheating section 10 and the brazing section 20 are simultaneously opened to communicate the preheating shell and the brazing shell. The outlet side of the brazing section 20 faces the cooling section 30 and may meet the cooling section 30; the outlet side is provided with a third partition door 53 that can be opened and closed. The third partition door 53 may serve as a common partition door for the brazing section 20 and the cooling section 30, and the opened third partition door 53 communicates the brazing section 20 and the cooling section 30 so that the workpiece may enter the cooling section 30 from the brazing section 20.
The brazing shell can also be provided with an air charging hole for introducing nitrogen into the brazing shell and discharging air in the brazing shell, so that the oxygen content in the brazing shell is reduced, and the oxygen content in the brazing shell is lower than 100 PPM.
The brazing section 20 may further comprise a fan 21 disposed within the brazing enclosure for driving the gas to be distributed evenly within the brazing enclosure, thereby achieving a uniform temperature within the brazing enclosure.
The cooling section 30 may include a cooling housing, an air cooler disposed within the cooling housing. In the cooling section 30, the brazed workpiece is cooled in an air cooling manner, so that the temperature of the workpiece can be reduced to 45 ℃ or below.
Further, a temperature detection unit and an oxygen content detection unit are arranged in the preheating section 10 and the brazing section 20, so that the temperature change and the oxygen content in the preheating section 10 and the brazing section 20 can be acquired in real time during operation.
Referring to fig. 1, the sectional brazing method for the workpiece by using the sectional brazing device may include the following steps:
s1, conveying the workpieces to be welded to the preheating section 10, and performing preheating treatment in the sealed preheating section 10 to increase the temperature of the workpieces to 450-550 ℃.
Wherein the workpiece to be welded comprises an aluminum piece. The brazing filler metal is placed in advance at the required welding position on the workpiece to be welded, the workpiece is placed on the transmission mechanism 40, the workpiece can be placed on the feeding tray 41 and then placed on the transmission mechanism 40, and the workpiece is fed into the preheating section 10 through the transmission mechanism 40. During the transfer, the first partition door 51 on the inlet side of the preheating section 10 is opened, and the first partition door 51 is closed to close the inlet side after the work pieces enter the preheating section 10.
After the workpiece enters the preheating section 10 to be in place, the first heating element is started to heat the inner cavity of the preheating section 10, so that the workpiece is heated, and the temperature of the workpiece is increased to 450-550 ℃. Preferably, the heating rate of the workpiece is 20-40 ℃/min.
After the temperature of the workpiece is raised to 450-550 ℃, the workpiece is conveyed to the brazing section 20 after being kept for 10 min. The time for holding is not limited to 10min, and may be increased or decreased according to the actual time.
According to the requirement of the solder, after the work pieces enter the preheating section 10, the oxygen content in the preheating section 10 can be reduced, for example, the oxygen content is reduced to 100PPM by charging nitrogen gas into the preheating section 10 to exhaust the air in the preheating section 10 (unidirectional exhaust).
S2, the preheated workpiece is conveyed to the brazing section 20, and brazing treatment is performed in the closed brazing section 20.
The oxygen content in the brazing section 20 is less than 100PPM to avoid oxidation of the brazing filler metal.
After the preheating of the workpiece is completed, the second partition door 52 between the preheating section 10 and the brazing section 20 is opened, the transmission mechanism 40 conveys the workpiece from the preheating section 10 into the brazing section 20, and simultaneously charges air (nitrogen gas) into the brazing section 20 to exhaust the original air (one-way exhaust) in the brazing section 20, thereby exhausting the oxygen in the brazing section 20. After the workpiece enters the brazing section 20, the second partition door 52 is closed to form a closed chamber in the inner cavity of the brazing section 20, and simultaneously, the gas (nitrogen) filling is continuously performed, so that the oxygen content in the brazing section 20 is always lower than 100 PPM.
After the workpiece is positioned in the brazing section 20, the second heating element is started to heat the inner cavity of the brazing section 20, so that the temperature in the brazing section 20 is increased to the brazing temperature of 550-630 ℃ at the heating rate of 10-20 ℃/min, and the temperature uniformity of the workpiece is +/-3 ℃. At this brazing temperature, the brazing filler metal on the work piece melts and fills freely in the weld gap on the work piece by capillary action.
The temperature can be kept for 10min (can be increased or decreased according to the actual condition) after reaching the brazing temperature, then the temperature can be reduced to change the brazing filler metal from a liquid state to a solid state, and the subsequent workpiece cooling treatment is carried out after the brazing filler metal is shaped.
And S3, conveying the brazed workpiece to a cooling section 30 for cooling.
After step S2, the third partition door 53 on the outlet side of the brazing section 20 is opened, and the driving mechanism 40 sends the workpiece from the brazing section 20 into the cooling section 30. The reverse flow of air from the cooling section 30 into the brazing section 20 should be avoided during the transfer. The third partition door 53 is closed after the workpiece enters the cooling section 30.
In the cooling section 30, the workpiece can be cooled by an air cooler or the like in an air cooling manner, wherein the cooling rate is 30-50 ℃/min, so that the workpiece is cooled to a temperature which is convenient to take out and transfer, such as 45 ℃ or below.
The sectional brazing device and the sectional brazing method are suitable for welding the radiator, the radiator meeting the heat dissipation power requirement is obtained, and meanwhile, compared with vacuum brazing, the cost is reduced, and a large amount of welding requirements are met.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A segmented brazing method, comprising the steps of:
s1, conveying the workpiece to be welded to a preheating section, and performing preheating treatment in the sealed preheating section to increase the temperature of the workpiece to 450-550 ℃;
s2, conveying the preheated workpiece to a brazing section, and performing brazing treatment in the sealed brazing section; the oxygen content in the brazing section is lower than 100 PPM;
and S3, conveying the workpieces subjected to brazing to a cooling section for cooling.
2. The segmented brazing method according to claim 1, wherein in the step S1, the temperature rise rate of the workpiece in the preheating section is 20-40 ℃/min.
3. The staged brazing method as claimed in claim 1, wherein in step S1, the oxygen content in the preheating stage is reduced by charging nitrogen gas into the preheating stage to discharge air from the preheating stage.
4. The staged brazing method according to claim 1, wherein in step S2, the brazing temperature in the brazing stage is 550 ℃ to 630 ℃, and the temperature uniformity of the workpiece is ± 3 ℃.
5. The staged brazing method according to claim 4, wherein in step S2, the temperature is raised to the brazing temperature at a ramp rate of 10 ℃/min to 20 ℃/min within the brazing stage.
6. The segmented brazing method according to claim 1, wherein in the step S3, the cooling rate of the cooling segment is 30-50 ℃/min.
7. The staged brazing method according to claim 1, wherein in step S3, the temperature of the brazed workpiece is lowered by air cooling.
8. A sectional brazing device is characterized by comprising a conveying mechanism, a preheating section for preheating a workpiece to be welded, and a brazing section for brazing the preheated workpiece;
the conveying mechanism is arranged between the preheating section and the brazing section and is used for conveying the workpieces to the preheating section and the brazing section in sequence.
9. The staged brazing apparatus according to claim 8, further comprising a cooling section for cooling the brazed workpieces; the transfer mechanism also extends to the cooling section to transfer the workpiece from the brazing section to the cooling section.
10. The staged brazing device according to claim 8 or 9, wherein the preheating stage includes a preheating housing, a first heating element disposed within the preheating housing; the brazing section comprises a brazing shell and a second heating element arranged in the brazing shell;
a first partition door capable of being opened and closed is arranged on the inlet side of the preheating shell, and the workpiece enters the preheating shell through the first partition door; the outlet side of the preheating shell and the inlet side of the brazing shell are provided with second partition doors capable of being opened and closed, and the workpieces enter the brazing shell from the preheating shell through the second partition doors;
and the outlet side of the brazing shell is provided with a third partition door capable of opening and closing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111357187.7A CN114029575A (en) | 2021-11-16 | 2021-11-16 | Segmented brazing method and segmented brazing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111357187.7A CN114029575A (en) | 2021-11-16 | 2021-11-16 | Segmented brazing method and segmented brazing device |
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| CN114029575A true CN114029575A (en) | 2022-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111357187.7A Pending CN114029575A (en) | 2021-11-16 | 2021-11-16 | Segmented brazing method and segmented brazing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115815731A (en) * | 2023-01-06 | 2023-03-21 | 江苏省海洋资源开发研究院(连云港) | Environment-friendly high-sealing brazing device |
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| JPH05192765A (en) * | 1991-10-18 | 1993-08-03 | Nippondenso Co Ltd | Aluminum brazing method and furnace therefor |
| US20010051323A1 (en) * | 2000-05-30 | 2001-12-13 | Oak Nippon Co. Ltd. | Convection-type brazing method and its apparatus for metal workpieces |
| CN101104216A (en) * | 2007-04-09 | 2008-01-16 | 盐城市康杰机械制造有限公司 | Intermittent type gas protecting soldering furnace |
| JP2014237142A (en) * | 2013-06-06 | 2014-12-18 | 大陽日酸株式会社 | Brazing furnace and brazing method of aluminum material |
| US20170282271A1 (en) * | 2014-10-28 | 2017-10-05 | Uacj Corporation | Brazing furnace and aluminum-material brazing method |
| CN110948074A (en) * | 2019-12-27 | 2020-04-03 | 山东海力同创散热制冷技术开发有限公司 | Brazing device and process for cooling plate in closed cavity under inert gas protection environment |
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2021
- 2021-11-16 CN CN202111357187.7A patent/CN114029575A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05192765A (en) * | 1991-10-18 | 1993-08-03 | Nippondenso Co Ltd | Aluminum brazing method and furnace therefor |
| US20010051323A1 (en) * | 2000-05-30 | 2001-12-13 | Oak Nippon Co. Ltd. | Convection-type brazing method and its apparatus for metal workpieces |
| CN101104216A (en) * | 2007-04-09 | 2008-01-16 | 盐城市康杰机械制造有限公司 | Intermittent type gas protecting soldering furnace |
| JP2014237142A (en) * | 2013-06-06 | 2014-12-18 | 大陽日酸株式会社 | Brazing furnace and brazing method of aluminum material |
| US20170282271A1 (en) * | 2014-10-28 | 2017-10-05 | Uacj Corporation | Brazing furnace and aluminum-material brazing method |
| CN110948074A (en) * | 2019-12-27 | 2020-04-03 | 山东海力同创散热制冷技术开发有限公司 | Brazing device and process for cooling plate in closed cavity under inert gas protection environment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115815731A (en) * | 2023-01-06 | 2023-03-21 | 江苏省海洋资源开发研究院(连云港) | Environment-friendly high-sealing brazing device |
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