Flat tube machining device and method

Abstract

A flat pipe machining device comprises a bending device and an edge rolling device, the bending device comprises a male die and a female die, the female die comprises a first containing groove, at least part of the male die can be located in the first containing groove, and the female die comprises a first convex part, a first concave part and a second concave part; the male die comprises a first concave part and a second concave part, the first concave part and the second concave part are located on the two sides of the first convex part, the male die comprises a crimping part, a second convex part and a third convex part, the crimping part and the first convex part can clamp a material to be machined, the second convex part can be matched with the first concave part, and the third convex part can be matched with the second concave part; the edge rolling device comprises a core die and a bottom die, the core die comprises an arc part (3011) and an avoiding part, the avoiding part is arranged away from the bottom die, the bottom die comprises a second containing groove, and at least part of the arc part can be located in the second containing groove.

Description

Technical Field

[0001] This application relates to the technical field of machining, and in particular to a processing device and method for flat tubes. Background Art

[0002] A microchannel heat exchanger generally includes flat tubes and header pipes. The header pipes are assembled at both ends of the flat tubes. The flat tubes have heat exchange channels penetrating along their length directions, and the heat exchange channels communicate with the inner cavities of the header pipes. In some application scenarios, for example, the flat tubes of the heat exchanger integrated into a gas-liquid separator need to be wound around the outer peripheral side of the gas-liquid separator cylinder, and the header pipes extend along the axial direction of the cylinder. To reduce the volume of the integrated component, sometimes the header pipes are arranged inside the arc formed by the flat tubes, which requires adjustment of the shape of the flat tubes. How to process flat tubes with specific shapes to ensure stable dimensions and ensure the smoothness of the heat exchange channels inside the flat tubes, and the flat tubes have necking structures at both ends are technical problems to be solved. Summary of the Invention

[0003] The purpose of this application is to provide a processing device and method for flat tubes.

[0004] This application provides a flat tube processing device, including a bending device and a curling device. The bending device includes a male mold and a female mold. The female mold includes a first receiving groove, and at least part of the male mold can be located in the first receiving groove. The female mold includes a first convex part, a first concave part, and a second concave part. The first concave part and the second concave part are located on both sides of the first convex part. The male mold includes a pressing part, a second convex part, and a third convex part. The pressing part and the first convex part can clamp the material to be processed. The second convex part can cooperate with the first concave part, and the third convex part can cooperate with the second concave part. The curling device includes a core mold and a bottom mold. The core mold includes an arc part (3011) and an avoidance part. The avoidance part is arranged away from the bottom mold. The bottom mold includes a second receiving groove, and at least part of the arc part can be located in the second receiving groove.

[0005] The flat tube processing device of this application includes a bending device and a curling device. The female mold and the male mold of the bending device press the material into a generally W shape. The head end of the flat tube is preformed in the bending process, and then wound by the core mold and the bottom mold of the curling device. Since the core mold is provided with an avoidance part, it can ensure that the head end formed by the bending process maintains better dimensions, and thus helps to improve the forming dimensional stability of the flat tube without affecting the smoothness of the heat exchange channels of the flat tube and the necking structures at both ends.

[0006] This application provides a flat tube processing method, which includes the following steps:

[0007] Obtain a flat tube blank;

[0008] Place the flat tube blank at the upper end of the female mold of the bending device, press down the male mold, and press to form a pre-bent part, where the pre-bent part includes a protruding part in the middle section;

[0009] Place the pre-bent part in the bottom mold of the curling device, with the protruding part of the pre-bent part facing the side where the core mold is located, press down the core mold, and the pre-bent part curls.

[0010] In the flat tube processing method of this application, by first bending and then curling the flat tube blank, the reverse arc formed by bending helps to ensure a better curling forming effect and helps to improve the forming size stability of the flat tube. Description of the Drawings

[0011] Figure 1 is a three-dimensional structural schematic diagram of a heat exchanger;

[0012] Figure 2 is Figure 1 a three-dimensional structural schematic diagram of the flat tube in;

[0013] Figure 3 is Figure 2 a structural schematic diagram of a certain end face of the flat tube in;

[0014] Figure 4 is a structural schematic diagram of the first embodiment of the bending device of this application;

[0015] Figure 5 is Figure 4 a cross-sectional structural schematic diagram of the female mold of the bending device of;

[0016] Figure 6 is Figure 5 a cross-sectional structural schematic diagram of the male mold of the bending device of;

[0017] Figure 7 is a structural schematic diagram of the second embodiment of the bending device of this application;

[0018] Figure 8 is a structural schematic diagram of the first embodiment of the curling device of this application;

[0019] Figure 9 is Figure 8 a structural schematic diagram of the pre-bent part and the bottom mold in;

[0020] Figure 10 is a structural schematic diagram of the core mold of the second embodiment of the curling device of this application;

[0021] Figure 11 is a structural schematic diagram of the third embodiment of the curling device of this application;

[0022] Figure 12Structural schematic diagram of the cooperation between the shaping die and the core die of the fourth embodiment of the curling device of the present application.

[0023] Reference numerals:

[0024] 100, flat tube; 1, first manifold; 2, second manifold; 101, main body; 102, connecting portion; 103, heat exchange channel; 1021, necked-down portion; 200, bending device; 201, male die; 202, female die; 2021, first receiving groove; 2022, first convex portion; 2023, first concave portion; 2024, second concave portion; 2011, crimping portion; 2012, second convex portion; 2013, third convex portion; 2025, guiding portion; 1022, transition arc segment; 203, upper die head; 204, lower die head; 2032, elastic member; 300, curling device; 301, core die; 302, bottom die; 3011, arc portion; 3012, avoidance portion; 3021, second receiving groove; 303, first shaping die; 304, second shaping die; 3022, blocking portion; 3023, upper end face; 100a, flat tube blank; 100b, pre-bent member; 100c, pre-formed flat tube; 100b1, protruding portion; 100b2, transition portion. Specific embodiments

[0025] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0026] It should be understood that the "first", "second" and similar terms used in the specification and claims of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not indicate a quantity limitation, but indicate that there is at least one; "several" means a quantity of two or more, unless otherwise specified. The orientation terms such as up, down, left, right, front, back, inner, outer, top, bottom, etc. mentioned or likely to be mentioned in the text are defined relative to the structure shown in the corresponding drawings, and they are relative concepts, so they may change accordingly according to their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms. The terms "including" or "comprising" and the like mean that the elements or objects appearing before "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects.

[0027] The following will, in conjunction with the accompanying Figure 1 drawings Figure 2 and

[0028] exemplary Figure 1 drawings Figure 2 illustrate in detail the heat exchanger and flat tubes involved in this application.

[0029] Furthermore, as Figure 3 shown in

[0030] the accompanying Figures 4 - 11 drawings, the heat exchanger includes flat tubes 100, a first header 1, and a second header 2. The two ends of the flat tubes 100 are inserted into the first header 1 and the second header 2. Of course, this is only an exemplary application scenario of the flat tubes 100, and there can be other application scenarios. The flat tubes 100 include a main body portion 101 and connecting portions 102. The main body portion 101 and the connecting portions 102 are integral parts. The connecting portions 102 are located at both ends of the main body portion 101. The flat tubes 100 include heat exchange channels 103 (not shown in the figures). The heat exchange channels 103 extend along the curling direction of the flat tubes 100, and the heat exchange channels 103 extend from one connecting portion 102 to the other connecting portion 102. The free ends of the connecting portions 102 are processed by necking to form necking portions 1021. The necking portions 1021 can be inserted into the lumen of the headers 1 and 2 to achieve the communication between the heat exchange channels 103 and the lumens of the headers 1 and 2.

[0031] Furthermore, as Figures 4 to 7, the processing device includes a bending device 200, where the bending device 200 includes a male mold 201 and a female mold 202. The female mold 202 includes a first receiving groove 2021. The male mold 201 can be at least partially located in the first receiving groove 2021. The shape of the groove wall S2 of the first receiving groove 2021 is the same as the shape of the side wall S3 of the male mold 201 facing the female mold 202. That is to say, the female mold 202 and the male mold 201 have mutually cooperating wall surfaces, namely the groove wall S2 and the side wall S3. Further, the shape of the groove wall S2 is generally in a W shape, and the cross-section of the groove wall S2 is an axisymmetric figure. Specifically, the female mold 202 includes a first convex portion 2022, a first concave portion 2023, and a second concave portion 2024. The first convex portion 2022 connects the first concave portion 2023 and the second concave portion 2024. The cross-section of the female mold 202 is an axisymmetric figure. Specifically, the first concave portion 2023 and the second concave portion 2024 are respectively located on both sides of the center line of the first convex portion 2022. The female mold 202 is symmetrically arranged with respect to the center line of the first convex portion 2022 as the axis of symmetry.

[0032] Correspondingly, the male mold 201 includes a crimping portion 2011, a second convex portion 2012, and a third convex portion 2013. The crimping portion 2011 faces the first convex portion 2022 of the female mold 202. Further, the crimping portion 2011 connects the second convex portion 2012 and the third convex portion 2013. The cross-section of the male mold 201 is an axisymmetric figure. Specifically, the second convex portion 2012 and the third convex portion 2013 are respectively located on both sides of the center line of the third concave portion 2011. The male mold 201 is symmetrically arranged with respect to the center line of the crimping portion 2011 as the axis of symmetry. At least part of the second convex portion 2012 can be located in the first concave portion 2023, and at least part of the third convex portion 2013 can be located in the second concave portion 2024.

[0033] Further, the female mold 202 includes a guiding portion 2025. The guiding portion 2025 connects the first concave portion 2023 and the second concave portion 2024. The guiding portion 2025 extends toward the side where the male film 201 is located. The guiding portion 2025 can guide the male film 201 to smoothly enter the first receiving groove 2021.

[0034] Further, define the radian of the first convex portion 2022 as R1. The first concave portion 2023 and the second concave portion 2024 include two radians R2 and R3. The radian R2 connects the radian R1, and the radian R3 connects the radian R2. Define the maximum outer diameter of the main body portion 101 of the flat tube 100 as D1. The connecting portion 102 includes a transition arc segment 1022, and the radian of the transition arc segment 1022 is R4, where 2R1 > D1 and R3 > R4.

[0035] When the bending device 200 is working, first place the to-be-processed flat tube blank 100a that has been cut according to a predetermined size and completed necking processing on the upper end of the female mold 202 of the bending device 200, press down the male mold 201, and press to form a pre-bent part 100b. The shape of the pre-bent part 100b is generally in a W shape, that is, the shape of the pre-bent part 100b coincides with at least part of the mating surface of the female mold 202 and the male mold 201.

[0036] The following will Figure 7 , in conjunction with the attached drawings, a detailed description will be given of the flat tube processing device according to the second exemplary embodiment of the present application. Without conflict, the features in the following embodiments and implementation manners can be mutually supplemented or combined.

[0037] For the female mold 202, refer to the first exemplary embodiment, and details will not be described herein again.

[0038] The crimping portion 2011 of the male mold 201 can move relative to the second convex portion 2012 and the third convex portion 2013. Specifically, the bending device 200 includes a driving component, and the output end of the driving component is connected to the crimping portion 2011. The driving component can drive the crimping portion 2011 to approach or move away from the female mold 202. Specifically, the bending device 200 includes an upper die head 203 and a lower die head 204. At least part of the driving component passes through the upper die head 203 and is fixedly connected to the crimping portion 2011. Further, the driving component includes an elastic member 2032, and the elastic member 2032 is located inside the upper die head 203. After the crimping portion 2011 abuts against the to-be-processed flat tube blank 100a above the first convex portion 2022, as the upper die head 203 continues to press down, the crimping portion 2011 no longer moves relative to the female mold 202, and the elastic member 2032 is compressed, but the second convex portion 2012 and the third convex portion 2013 continue to move downward to push and flatten the flat tube blank 100a into the first receiving groove 2021 of the female mold 202, realizing the bending process of the flat tube blank 100a. By setting that the crimping portion 2011 can move relative to the second convex portion 2012 and the third convex portion 2013 on both sides of it, the crimping portion 2011 first clamps the middle section of the flat tube blank 100a with the first convex portion 2022 to realize the pre-positioning of the flat tube blank 100a, and then presses down the second convex portion 2012 and the third convex portion 2013 to realize the bending of the flat tube blank 100a and obtain the pre-bent part 100b.

[0039] As Figure 9 , the pre-bent part 100b includes a protruding portion 100b1 located in the middle section, connecting portions 102 located at both ends, and a transition portion 100b2 connecting the protruding portion 100b1 and the connecting portions 102. Further, along the thickness direction of the pre-bent part 100b, the protruding portion 100b1 and the transition portion 100b2 protrude in opposite directions, that is, Figure 8When in the shown placement position, the highest point of the pre-bent part 100b is located at the protruding part 100b1, and the lowest point is located at the transition part 100b2. Further, along the thickness direction of the pre-bent part 100b, the connecting part 102 extends toward the side of the highest point, that is, the pre-bent part 100b is generally in a W shape.

[0040] As Figure 8 , the processing device includes a curling device 300, and the curling device 300 includes a core die 301 and a bottom die 302. Among them, the core die 301 includes an arc part 3011 and an avoidance part 3012. The arc part 3011 faces the bottom die 302, and the avoidance part 3012 faces away from the bottom die 302. Correspondingly, the bottom die 302 includes a second receiving groove 3021, and at least part of the arc part 3011 can be located in the second receiving groove 3021. The groove wall of the second receiving groove 3021 and the outer peripheral wall of at least part of the core die 301 form a mating surface, that is, the cross-sectional shape of the groove wall of the second receiving groove 3021 is the same as that of at least part of the cross-section of the arc part 3011.

[0041] Further, the second receiving groove 3021 is in a semi-cylindrical shape, that is, the central angle of the cross-section of the second receiving groove 3021 is not greater than 90 degrees, and the cross-section of the core die 301 is larger than a semi-circle. It can be understood that the central angle of the cross-section of the arc part 3011 of the core die 301 is greater than 180 degrees. When the core die 301 and the bottom die 302 are in a mating state, at least the avoidance part 3012 is located outside the second receiving groove 3021, that is, at least part of the core die 301 protrudes from the bottom die 302. Since the connecting part 102 of the flat tube 100 is bent toward the inner side of the main body part 101, when curling is processed, an avoidance space needs to be left for the connecting part 102, and only the main body part 101 is curled.

[0042] Further, the bottom die 302 includes a blocking part 3022, and the blocking part 3022 is arranged on both sides of the second receiving groove 3021. The bottom die 302 includes an upper end surface 3023, and the upper end surface 3023 is connected to the groove wall of the second receiving groove 3021. One side edge of the blocking part 3022 is connected to the upper end surface 3023. It can be understood that the blocking part 3022 is arranged on the upper end surface 3023 or may not be arranged on the upper end surface 3023. Before the curling device 300 processes the pre-bent part 100b, the pre-bent part 100b needs to be placed on the upper end of the bottom die 302. The protruding part 100b1 of the pre-bent part 100b faces away from the upper end surface 3023, at least part of the transition part 100b2 contacts the upper end surface 3023, and the outer side wall surface of the connecting part 102 is close to or contacts the blocking part 3022. When the core die 301 applies a downward pressure to deform the pre-bent part 100b, the blocking part 3022 can limit the pre-bent part 100b from sliding to both sides.

[0043] As Figure 9, in another embodiment, the cross-sectional shape of the avoidance portion 3012 is the same as that of the connecting portion 102, with some differences in dimensions. With such a setting, the flat tube 100 that meets the shape requirements can be obtained after the curling process.

[0044] Of course, as Figure 10 and Figure 11 , in some embodiments, in order to obtain a flat tube 100 with better forming dimensions, the preformed flat tube 100c after the curling process is subjected to a shaping process. Specifically, the curling device 300 further includes shaping jigs (303 / 304). The shaping jigs (303 / 304) include a shaping mating surface S4. The shaping mating surface S4 can cooperate with at least a part of the outer contour of the core die 301. Further, the shaping mating surface S4 cooperates with at least the outer side wall surface of the avoidance portion 3021. Of course, in some embodiments, as Figure 11 , the shaping mating surface S4 is semi-circular arc-shaped. Further, the shaping jigs (303 / 304) include a first shaping jig 303 and a second shaping jig 304. The first shaping jig 303 and the second shaping jig 304 are respectively located on both sides of the center line of the core die 301. The first shaping jig 303 and the second shaping jig 304 can approach or move away from the core die 301. The preformed flat tube 100c after the curling process is sleeved on the outer peripheral side of the core die 301. The first shaping jig 303 and the second shaping jig 304 move towards the core die 301 to further shape the preformed flat tube 100c. At this time, the core die 301 also cooperates with the bottom die 302 to complete the shaping process of the preformed flat tube 100c. By setting the shaping jigs (303 / 304) to shape the preformed flat tube 100c after curling, a flat tube 100 with better dimensions is obtained.

[0045] This application also protects a processing method for a flat tube. This processing method uses the above-mentioned processing device, which will not be elaborated here. This processing method includes the following steps:

[0046] Obtain a flat tube blank 100a;

[0047] Place the flat tube blank 100a on the upper end of the female die 202 of the bending device 200, press down the male die 201 to form a pre-bent part 100b;

[0048] Place the pre-bent part 100b on the bottom die 302 of the curling device 300, with the protruding part of the pre-bent part 100b facing the side where the core die 301 is located, press down the core die 301, and the pre-bent part 100b is curled to form a flat tube 100 or a preformed flat tube 100c;

[0049] The shaping fixture moves towards the core mold 301 to shape the preformed flat tube 100c sleeved on the outer peripheral side of the core mold 301 into the flat tube 100. Specifically, the first shaping fixture 303 and the second shaping fixture 304 move towards the core mold 301, and at least part of the shaping mating surface S4 contacts the outer peripheral wall of the flat tube 100.

[0050] Furthermore, the step of obtaining the flat tube blank 100a includes cutting the pipe into a predetermined length and performing necking treatment.

[0051] It should be noted that the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the technical field can still modify the present invention or make equivalent replacements, and all technical solutions and their improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A flat tube processing device, characterized in that, The invention comprises a bending device (200) and a rolling device (300), wherein the bending device (200) comprises a male mold (201) and a female mold (202), wherein the female mold (202) comprises a first receiving groove (2021), wherein at least a portion of the male mold (201) can be located in the first receiving groove (2021), and wherein the female mold (202) comprises a first convex portion (2022), a first concave portion (2023) and a second concave portion (2024), wherein the first concave portion (2023) and the second concave portion (2024) are respectively The second concave portion (2024) is located on both sides of the first convex portion (2022); the male mold (201) comprises a crimping portion (2011), a second convex portion (2012) and a third convex portion (2013); the crimping portion (2011) and the first convex portion (2022) are capable of clamping a material to be processed; the second convex portion (2012) is capable of cooperating with the first concave portion (2023); and the third convex portion (2013) is capable of cooperating with the second concave portion (2024); The rolling device (300) comprises a core mold (301) and a bottom mold (302), the core mold (301) comprises a circular arc portion (3011) and an avoidance portion (3012), the avoidance portion (3012) is arranged away from the bottom mold (302), and the bottom mold (302) comprises a second accommodating groove (3021), and at least a portion of the circular arc portion (3011) can be located in the second accommodating groove (3021).

2. The flat tube processing device according to claim 1, characterized in that, The bending device (200) comprises a driving component, the output end of which is connected to the crimping portion (2011), and the driving component is capable of driving the crimping portion (2011) to move closer to or away from the female mold (202), and the crimping portion (2011) is capable of moving relative to the second convex portion (2012) and the third convex portion (2013).

3. The flat tube processing device according to claim 2, characterized in that, The female mold (202) comprises a guide portion (2025), wherein the guide portion (2025) connects the first recess (2023) and the second recess (2024), and the guide portion (2025) extends toward the side where the male membrane (201) is located.

4. The flat tube processing device according to claim 3, characterized in that, The curvature of the first convex portion (2022) is defined as R1, the curvature of the transition section where the first concave portion (2023) and the second concave portion (2024) connect to the guide portion (2025) is defined as R3, the flat tube (100) comprises a main body portion (101) and a connecting portion (102), the maximum outer diameter of the main body portion (101) is D1, the connecting portion (102) comprises a transition arc segment (1022), the curvature of the transition arc segment (1022) is R4, wherein 2R1>D1, R3>R4.

5. The flat tube processing device according to any one of claims 1-4, characterized in that, The bottom mold (302) comprises a blocking portion (3022), wherein the blocking portion (3022) is arranged on both sides of the second receiving groove (3021), and the bottom mold (302) comprises an upper end surface (3023), wherein the upper end surface (3023) is connected to the groove wall of the second receiving groove (3021), and a side surface of the blocking portion (3022) is connected to the upper end surface (3023).

6. The flat tube processing device according to claim 5, characterized in that, The groove wall of the second receiving groove (3021) and at least a part of the outer peripheral wall of the core mold (301) form a mating surface. The central angle of the cross-section of the second receiving groove (3021) is not greater than 90 degrees, and the central angle of the cross-section of the arc portion (3011) of the core mold (301) is greater than 180 degrees.

7. The flat tube processing device according to any one of claims 1-6, characterized in that The curling device (300) further includes a shaping fixture (303 / 304). The shaping fixture (303 / 304) includes a shaping mating surface S4, and the shaping mating surface S4 mates with at least a part of the outer contour of the core mold (301).

8. A flat tube processing method, characterized in that This processing method uses the processing device described in any one of claims 1-7. This processing method includes the following steps: Obtain a flat tube blank (100a); Place the flat tube blank (100a) on the upper end of the female mold (202) of the bending device (200), and press down the male mold (201) to press and form a pre-bent part (100b). The pre-bent part 100b includes a protruding part (100b1) located in the middle section. Place the pre-bent part (100b) in the bottom mold (302) of the curling device (300). The protruding part (100b1) of the pre-bent part (100b) faces the side where the core mold (301) is located, and press down the core mold (301) to curl the pre-bent part (100b).

9. The flat tube processing method according to claim 8, characterized in that, This processing method further includes a shaping step, and the shaping step includes: The shaping fixture (303 / 304) moves towards the core mold (301) to shape the pre-formed flat tube (100c) sleeved on the outer peripheral side of the core mold (301) into the flat tube (100).

10. The flat tube processing method according to claim 8 or 9, characterized in that The step of placing the flat tube blank (100a) on the upper end of the female mold (202) of the bending device (200) and pressing down the male mold (201) to press and form a pre-bent part (100b) includes: after the crimping part (2011) contacts the flat tube blank (100a), the upper die head (203) continues to press down, the crimping part (2011) no longer moves relative to the female mold (202), and the second convex part (2012) and the third convex part (2013) continue to move down to push the flat tube blank (100a) into the first receiving groove (2021).

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