CN115781204A - Forming process method of flat copper pipe - Google Patents
Forming process method of flat copper pipe Download PDFInfo
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- CN115781204A CN115781204A CN202211550261.1A CN202211550261A CN115781204A CN 115781204 A CN115781204 A CN 115781204A CN 202211550261 A CN202211550261 A CN 202211550261A CN 115781204 A CN115781204 A CN 115781204A
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Abstract
The invention discloses a forming process method of a flat copper pipe, which is used for processing the flat copper pipe and sequentially comprises the following steps: manufacturing a copper pipe blank, performing heat treatment on the blank, pickling the blank, processing the size characteristics, pressing a flat copper pipe, welding the end face of the flat copper pipe, and finishing a welding line. The invention can effectively avoid the arc surface crack or crack in the pressing process of the flat copper pipe by a reasonable process method, and ensure the success rate of the press forming of the flat copper pipe and good sealing property.
Description
Technical Field
The invention relates to the technical field of copper pipe processing technology, in particular to a flat copper pipe forming process method.
Background
The miniaturized and high-power electrical appliance assembly is used more and more frequently on marine equipment, the high-power assembly can generate a large amount of heat during operation, the traditional air cooling mode cannot meet the heat dissipation requirement of the high-power assembly, and the water cooling mode gradually replaces the air cooling mode. The microchannel heat exchange device mainly comprises three parts, namely a collecting pipe, flat copper pipes and fins, wherein the two collecting pipes are connected through the flat copper pipes, and the fins are brazed between the flat copper pipes to increase the heat dissipation area. The heat exchanger has the advantages of large heat exchange area, high heat transfer efficiency, small water flow resistance, compact structure and the like, and has more and more extensive application in water-cooling mode equipment.
The flat copper tube is used as an important component of the micro-channel heat exchange device, the processing and forming quality of the flat copper tube has great influence on the heat dissipation function of the whole device, and the flat copper tube is processed by a series of technological processes such as heat treatment, pressing, numerical control processing, welding and the like by using a copper tube. If the processing technique cannot be reasonably arranged in the processing process, cracks or fissures exist, so that the hidden danger of water leakage exists.
Disclosure of Invention
The invention aims to solve the technical problems of how to press the copper pipe into the flat pipe, prevent the pressed arc surface from cracking and ensure the good sealing property of the pressed flat pipe.
In order to solve the technical problem, the invention provides a flat copper tube forming process method, which comprises the following steps:
s1, manufacturing a copper pipe blank: straightening the copper pipe, cutting the copper pipe by using a pipe cutter to ensure the positive tolerance of the length and the size of a blank;
s2, blank heat treatment: carrying out heat treatment annealing on the blank;
s3, blank pickling: cleaning the blank after the heat treatment by using acid washing, and cleaning the residual acid washing solution by using clear water to ensure that no obvious oxide exists on the surface of the blank;
s4, processing size characteristics: processing two end faces of the blank to a required length, and forbidding using cutting fluid in the processing process;
s5, pressing a flat copper pipe: placing the blank in a tooling die, and pressing and forming the blank into a flat copper pipe on a 40t oil press;
s6, welding the end faces of the flat copper pipes: cleaning the end surface of the flat copper pipe and the inner side of the welding line to ensure no oil stain; the flat copper pipe is vertically placed to enable a welding line to face upwards for welding, and when welding is conducted, the welding flux is guaranteed to be completely melted and uniformly filled, and the height of the welding flux is not lower than the end face of the flat copper pipe; after the flat copper pipe is cooled, turning around and placing, and welding the other end face according to the requirements;
s7, weld finishing: welding deformation affecting quality and appearance is eliminated by flame or mechanical correction, and welding seams are polished and trimmed and splashes are cleaned.
The process method for forming the flat copper tube comprises the steps of heating the flat copper tube in a resistance furnace at the temperature of 630-640 ℃ in the step S2, preserving heat for 1.5-2.5 hours, and cooling in air.
In the step S4, the two ends of the inner circle of the blank are processed and welded to form a chamfer angle of 2 multiplied by 45 degrees.
In the step S6, the end face of the flat copper pipe is welded by silver brazing (BAg 45 CuZn) with good welding liquid fluidity and 45% silver content, and the operation is to ensure that the welding material fills the process chamfer
The beneficial effects of the invention are: the processing and forming process method of the flat copper pipe can effectively avoid the circular arc surface cracks or crazes which may occur in the pressing process of the flat copper pipe, and ensure the success rate and good sealing performance of the press forming of the flat copper pipe.
Drawings
FIG. 1 is a flow chart of the flat copper tube forming process of the present invention;
FIG. 2 is a schematic three-dimensional structure diagram of a flat copper tube to be processed;
FIG. 3 is a schematic diagram of a two-dimensional structure of a flat copper tube to be processed;
FIG. 4 is a schematic illustration of a copper tube prior to pressing;
FIG. 5 is a schematic view of a flattened tube after pressing;
fig. 6 is a sectional dimension view of the copper pipe before and after pressing.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific examples.
Before describing the embodiments of the present invention in detail, the environment in which the present invention is applied will be described. The technology of the invention is mainly applied to the processing and forming process method of the flat copper tube. The flat copper pipe is pressed through the copper pipe, and is formed after welding two end faces, and practice shows that if the flat copper pipe cannot be strictly according to a forming process in the manufacturing process, cracks or cracks can appear on the arc side face after forming, so that risks such as water leakage exist in the subsequent use process, and the service life of the whole product is seriously influenced.
As shown in fig. 1, the embodiment of the invention discloses a flat copper tube forming process, which comprises the following steps: s1, manufacturing a copper pipe blank. And S2, carrying out heat treatment on the blank. And S3, pickling the blank. And S4, processing the size characteristics. And S5, pressing the flat copper pipe. And S6, welding the end face of the flat copper pipe. And S7, post-welding treatment.
For example, fig. 2 is a schematic three-dimensional structure diagram of a flat copper tube, and fig. 3 is a schematic two-dimensional diagram of the flat copper tube after pressing. The blank adopts a phi 34X 4 copper pipe and is made of T2Y. The embodiment describes the processing and forming process method of the flat copper tube in detail:
s1, manufacturing a copper pipe blank: the phi 34X 4 copper pipe is straightened, a pipe cutter is used for blanking to ensure the positive tolerance of the length size of the blank, and the blanking length size of the embodiment is set to be 575mm.
S2, blank heat treatment: and (3) carrying out heat treatment annealing on the blank, heating the blank to 630-640 ℃ in a box type resistance furnace, preserving the heat for 1.5-2.5 h, and cooling in air.
S3, blank pickling: and (3) pickling and cleaning the blank subjected to heat treatment, and cleaning the residual pickling solution with clear water to ensure that no obvious oxide exists on the surface of the blank.
S4, processing size characteristics: processing two end faces of the blank to a required length, and forbidding using cutting fluid in the processing process; the two ends of the inner circle of the blank are processed and welded with process chamfers of 2 multiplied by 45 degrees, and the two ends of the blank are processed to the length dimension of 570mm in the example.
S5, pressing a flat copper pipe: and (3) placing the blank in a tool die as shown in fig. 4 and 5, and pressing the blank on a 40t oil press until the flat copper pipe is formed, wherein sectional size diagrams before and after pressing are shown in fig. 6.
S6, welding the end faces of the flat copper pipes: cleaning the end surface of the flat pipe and the inner side of the welding line to ensure no oil stain; the flat tube is vertically placed, so that a welding seam faces upwards, and the welding flux is ensured to be completely melted and uniformly filled during welding, and the height of the welding flux is not lower than the end face of the flat tube; after the flat pipe is cooled, turning around and placing, and welding the other end face according to the requirement; the end part of the flat tube is welded by silver brazing (BAg 45 CuZn) with good welding liquid fluidity and 45% silver content, and the process chamfer is ensured to be filled with the welding flux in operation.
S7, weld finishing: welding deformation affecting quality and appearance is corrected by flame or machinery, and welding seams are polished and trimmed and splashes are cleaned.
As mentioned above, the processing and forming process method of the flat copper tube can effectively avoid the circular arc surface cracks or crazes which may occur in the pressing process of the flat copper tube, and ensure the success rate of the pressing and forming of the flat copper tube and good sealing performance.
Claims (4)
1. A flat copper tube forming process method is characterized in that: comprises the following steps
S1, manufacturing a copper pipe blank: straightening the copper pipe, and cutting the copper pipe by using a pipe cutter to ensure the positive tolerance of the length and the size of a blank;
s2, blank heat treatment: carrying out heat treatment annealing on the blank;
s3, pickling of the blank: cleaning the blank after the heat treatment by using acid washing, and cleaning the residual acid washing solution by using clear water to ensure that no obvious oxide exists on the surface of the blank;
s4, processing size characteristics: processing two end faces of the blank to a required length size;
s5, pressing a flat copper pipe: placing the blank in a tooling die, and pressing and forming the blank into a flat copper pipe on an oil press;
s6, welding the end faces of the flat copper pipes: cleaning the end surface of the flat copper pipe and the inner side of the welding line to ensure no oil stain; the flat copper pipe is vertically placed to enable a welding line to face upwards for welding, and when welding is conducted, the welding flux is guaranteed to be completely melted and filled uniformly, and the height of the welding flux is not lower than the end face of the flat copper pipe; after the flat copper pipe is cooled, turning around and placing, and welding the other end face according to the requirements;
s7, weld finishing: welding deformation affecting quality and appearance is eliminated by flame or mechanical correction, and welding seams are polished and trimmed and splashes are cleaned.
2. The forming process method of a flat copper tube according to claim 1, wherein the heat treatment in step S2 is carried out by heating with a resistance furnace at 630-640 ℃, keeping the temperature for 1.5-2.5 h, and cooling with air.
3. A flat copper tube forming process as claimed in claim 1, wherein in step S4, the two ends of the inner circle of the blank are processed and welded to form chamfers of 2 × 45 °.
4. A process for forming a flat copper tube as claimed in claim 1, wherein in step S6, silver brazing with a silver content of 45% is used for welding the end face of the flat copper tube, and the process chamfer is ensured to be filled with solder in operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211550261.1A CN115781204A (en) | 2022-12-05 | 2022-12-05 | Forming process method of flat copper pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211550261.1A CN115781204A (en) | 2022-12-05 | 2022-12-05 | Forming process method of flat copper pipe |
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| CN115781204A true CN115781204A (en) | 2023-03-14 |
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| CN202211550261.1A Pending CN115781204A (en) | 2022-12-05 | 2022-12-05 | Forming process method of flat copper pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116922106A (en) * | 2023-09-13 | 2023-10-24 | 江苏瑞邦复合材料科技有限公司 | Forming method and forming equipment for composite flat wire of wind generating set |
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2022
- 2022-12-05 CN CN202211550261.1A patent/CN115781204A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116922106A (en) * | 2023-09-13 | 2023-10-24 | 江苏瑞邦复合材料科技有限公司 | Forming method and forming equipment for composite flat wire of wind generating set |
| CN116922106B (en) * | 2023-09-13 | 2024-01-05 | 江苏瑞邦复合材料科技有限公司 | Forming method and forming equipment for composite flat wire of wind generating set |
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