EGR cooler flat tube expansion and contraction device and method

Abstract

An EGR cooler flat tube expansion and contraction device and method, wherein a contraction assembly is arranged at one end of a mounting base plate, an expansion assembly is arranged at the other end of the mounting base plate, and a fixing assembly is arranged between the contraction assembly and the expansion assembly; a contraction fixing seat of the contraction assembly is connected to the mounting base plate, a contraction driving member is connected to the contraction fixing seat, a driving shaft of the contraction driving member passes through the contraction fixing seat and is connected to a contraction adapter plate; a contraction block is connected to the contraction adapter plate; an ejection driving member of the expansion assembly is connected to the expansion fixing seat, an ejection opening is formed on the expansion vertical plate, an expansion limiter is connected to the driving shaft of the ejection driving member, and the expansion limiter corresponds to the ejection opening; an expansion mold member is connected to the expansion vertical plate; the fixing assembly includes a profiling positioning block and a profiling pressing block; the profiling positioning block is formed with a flat tube accommodating groove, the profiling pressing block is arranged above the profiling positioning block, and the flat tube accommodating groove is between the contraction block and the expansion mold member. The invention improves production efficiency and product quality, and has low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe processing, and in particular relates to an EGR cooler flat pipe expansion and contraction device and method. Background Art

[0002] At present, in the mainstream EGR cooler assembly process, the assembly scheme of the flat tube assembly is mostly adopted: first assemble the fin into the flat tube, and the assembly gap between the flat tube and the fin is small, with a single-side gap of about 0.08mm. During the assembly process, the solder strip is prone to breakage or deformation of the fin end, and the assembly is time-consuming, inefficient, and the product quality consistency is poor. In order to ensure the assembly effect, it is necessary to press the flat tube assembly, assemble the flat tube assembly into the tube sheet, and expand and shrink the ends of the flat tube assembly.

[0003] At present, under the National VI Motor Vehicle Pollutant Emission Standard, the requirements for EGR cooler products are more stringent, and the corresponding product assembly process quality requirements are becoming increasingly stringent. In order to ensure that the assembly of the flat tube and the fin meets the gap requirements between the flat tube and the tube sheet, the flat tube needs to be expanded and contracted. In traditional technology, it is manual operation, which takes a lot of time. Not only is the workload large, but it is also difficult to ensure the expansion and contraction effect of the flat tube, and thus the assembly effect of the fin and the flat tube cannot be guaranteed. Summary of the invention

[0004] To this end, the present invention provides an EGR cooler flat tube expansion and contraction device and method to solve the problem that the traditional flat tube expansion and contraction process is time-consuming and labor-intensive and it is difficult to ensure the processing effect.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: an EGR cooler flat tube expansion and contraction device, comprising a mounting base plate, a contraction assembly, an expansion assembly and a fixing assembly;

[0006] The shrinking component is arranged at one end of the mounting base plate, the expanding component is arranged at the other end of the mounting base plate, and the fixing component is arranged between the shrinking component and the expanding component;

[0007] The necking assembly comprises a necking fixing seat, a necking driving member, a necking adapter plate and a necking block; the necking fixing seat is connected to the mounting base plate, the necking driving member is connected to the necking fixing seat, the driving shaft of the necking driving member passes through the necking fixing seat and then is connected to the necking adapter plate; the necking block is connected to the necking adapter plate;

[0008] The flaring assembly comprises an ejector drive, an flaring fixing seat, an flaring vertical plate, an flaring stopper and an flaring die; the ejector drive is connected to the flaring fixing seat, an ejection opening is formed on the flaring vertical plate, the flaring stopper is connected to the driving shaft of the ejector drive, and the flaring stopper corresponds to the ejection opening; the flaring die is connected to the flaring vertical plate;

[0009] The fixing assembly includes a contoured positioning block and a contoured pressing block; the contoured positioning block is formed with a flat tube accommodating groove, the contoured pressing block is arranged above the contoured positioning block, and the flat tube accommodating groove is located between the shrinking block and the expanding die piece.

[0010] As a preferred solution for the EGR cooler flat tube expansion and contraction device, the contraction assembly also includes a contraction limiting telescopic guide column, a guide column fixing plate and a guide column fixing bolt; one end of the contraction limiting telescopic guide column is connected to the contraction adapter plate, and the other end of the contraction limiting telescopic guide column passes through the contraction fixing seat and is connected to the guide column fixing plate, and the guide column fixing plate is connected to the contraction fixing seat via the guide column fixing bolt.

[0011] As a preferred solution for the EGR cooler flat tube expansion and contraction device, the expansion vertical plate is also provided with a mold opening, and the mold opening and the ejection opening intersect in a cross shape.

[0012] As a preferred solution of the EGR cooler flat tube expansion and contraction device, the expansion die member includes a first die head, a second die head and a die mounting plate, the first die head is connected to one end of the die mounting plate, and the second die head is connected to the other end of the die mounting plate;

[0013] The mold mounting plate is connected to the expansion vertical plate; the first mold head and the second mold head extend from the mold opening.

[0014] As a preferred solution of the EGR cooler flat tube expansion and contraction device, the expansion stopper moves to the ejection opening; a mold avoidance hole is formed at the center of the expansion stopper;

[0015] The mold mounting plate is located in the mold avoidance hole, the first mold head and the second mold head are located on both sides of the expansion limiter; and an avoidance channel is formed between the first mold head and the second mold head.

[0016] As a preferred solution of the EGR cooler flat tube expansion and contraction device, the central axis of the flat tube in the flat tube accommodating groove, the central axis of the contraction block and the central axis of the expansion stopper coincide with each other.

[0017] As a preferred solution for the EGR cooler flat tube expansion and contraction device, the fixing assembly also includes a quick clamp, a support plate and a support column, the fixed end of the quick clamp is connected to the support plate, the movable end of the quick clamp is connected to the contoured pressure block, the contoured positioning block is located above the support plate, the bottom of the support column is connected to the mounting base plate, and the top of the support column is connected to the support plate.

[0018] As a preferred solution of the EGR cooler flat tube expansion and contraction device, it also includes handles, which are distributed on both sides of the fixing component and connected to the upper end of the mounting base plate.

[0019] The present invention also provides a method for expanding and shrinking a flat tube of an EGR cooler, using the above-mentioned device for expanding and shrinking a flat tube of an EGR cooler, comprising:

[0020] The flat tube object to be expanded and shrunken is placed in the contour positioning block of the fixing component, and the flat tube object is pressed by the contour pressing block;

[0021] The shrinking drive of the shrinking assembly drives the shrinking block to shrink the shrinking end of the flat tube object, the shrinking drive drives the shrinking block to press the flat tube object against the expanding assembly, and the expanding die of the expanding assembly expands the expanding end of the flat tube object;

[0022] After the expansion and contraction of the flat tube object is completed, the ejection driving component is started, and the ejection driving component drives the expansion limiting component to eject the flat tube object from the expansion mold component.

[0023] As a preferred solution for the EGR cooler flat tube expansion and contraction method, the ejection drive member drives the expansion limit member to move a stroke greater than the length of the expansion die member exposed to the expansion vertical plate;

[0024] When the expansion limiter ejects the flat tube object, the shrinking drive member drives the shrinking block to separate from the flat tube object.

[0025] The invention has the following advantages: a mounting base plate, a shrinking assembly, an expanding assembly and a fixing assembly are provided; the shrinking assembly is arranged at one end of the mounting base plate, the expanding assembly is arranged at the other end of the mounting base plate, and the fixing assembly is arranged between the shrinking assembly and the expanding assembly; the shrinking assembly comprises a shrinking fixing seat, a shrinking driving member, a shrinking adapter plate and a shrinking block; the shrinking fixing seat is connected to the mounting base plate, the shrinking driving member is connected to the shrinking fixing seat, the driving shaft of the shrinking driving member passes through the shrinking fixing seat and is connected to the shrinking adapter plate; the shrinking block is connected to the shrinking adapter plate Plate; the flaring assembly includes an ejection drive, an flaring fixed seat, an flaring vertical plate, an flaring limiter and an flaring die; the ejection drive is connected to the flaring fixed seat, an ejection opening is formed on the flaring vertical plate, the flaring limiter is connected to the driving shaft of the ejection drive, and the flaring limiter corresponds to the ejection opening; the flaring die is connected to the flaring vertical plate; the fixing assembly includes a profiling positioning block and a profiling pressing block; the profiling positioning block is formed with a flat tube accommodating groove, the profiling pressing block is arranged above the profiling positioning block, and the flat tube accommodating groove is between the shrinking block and the flaring die. The present invention can make the fins easily loaded into the flat tubes, and the pressed flat tubes can easily pass through the grooves on the tube plate, which greatly improves the production efficiency, improves the product quality, reduces the defective rate, and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the drawings required for the implementation methods or the prior art descriptions are briefly introduced below. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0027] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0028] Figure 1 It is a schematic diagram of the structure of the EGR cooler flat tube expansion and contraction device provided in an embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the shrinking assembly of the EGR cooler flat tube expansion and shrinking device provided in an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the expansion component of the EGR cooler flat tube expansion and contraction device provided in an embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the fixing assembly of the EGR cooler flat tube expansion and contraction device provided in an embodiment of the present invention.

[0032] In the figure, 1. installation base plate; 2. shrinking assembly; 3. expanding assembly; 4. fixing assembly; 5. shrinking fixing seat; 6. shrinking driving member; 7. shrinking adapter plate; 8. shrinking block; 9. ejection driving member; 10. expanding fixing seat; 11. expanding vertical plate; 12. expanding limit member; 13. expanding mold member; 14. ejection opening; 15. contour positioning block; 16. contour pressure block; 17. flat tube accommodating groove; 18. shrinking limit telescopic guide column; 19. guide column fixing plate; 20. guide column fixing bolt; 21. mold opening; 22. first mold head; 23. second mold head; 24. mold mounting plate; 25. mold avoidance hole; 26. avoidance channel; 27. quick clamp; 28. support plate; 29. ​​support column; 30. handle. DETAILED DESCRIPTION

[0033] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 , an embodiment of the present invention provides an EGR cooler flat tube expansion and contraction device, comprising a mounting base plate 1, a contraction component 2, an expansion component 3 and a fixing component 4;

[0035] The shrinking component 2 is arranged at one end of the mounting base plate 1, the expanding component 3 is arranged at the other end of the mounting base plate 1, and the fixing component 4 is arranged between the shrinking component 2 and the expanding component 3;

[0036] The shrinking assembly 2 includes a shrinking fixing seat 5, a shrinking driving member 6, a shrinking adapter plate 7 and a shrinking block 8; the shrinking fixing seat 5 is connected to the mounting base 1, the shrinking driving member 6 is connected to the shrinking fixing seat 5, and the driving shaft of the shrinking driving member 6 passes through the shrinking fixing seat 5 and is connected to the shrinking adapter plate 7; the shrinking block 8 is connected to the shrinking adapter plate 7;

[0037] The flaring assembly 3 includes an ejector drive member 9, an flaring fixed seat 10, an flaring vertical plate 11, an flaring stopper 12 and an flaring die member 13; the ejector drive member 9 is connected to the flaring fixed seat 10, an ejection opening 14 is formed on the flaring vertical plate 11, the flaring stopper 12 is connected to the driving shaft of the ejector drive member 9, and the flaring stopper 12 corresponds to the ejection opening 14; the flaring die member 13 is connected to the flaring vertical plate 11;

[0038] The fixing assembly 4 includes a profiling positioning block 15 and a profiling pressing block 16 ; the profiling positioning block 15 is formed with a flat tube accommodating groove 17 , the profiling pressing block 16 is arranged above the profiling positioning block 15 , and the flat tube accommodating groove 17 is between the shrinking block 8 and the expanding die piece 13 .

[0039] Assistance Figure 2 In this embodiment, the shrinking assembly 2 also includes a shrinking limit telescopic guide column 18, a guide column fixing plate 19 and a guide column fixing bolt 20; one end of the shrinking limit telescopic guide column 18 is connected to the shrinking adapter plate 7, and the other end of the shrinking limit telescopic guide column 18 passes through the shrinking fixing seat 5 and is connected to the guide column fixing plate 19, and the guide column fixing plate 19 is connected to the shrinking fixing seat 5 through the guide column fixing bolt 20.

[0040] Specifically, the shrinking block 8 can be driven to move by a shrinking driving member 6, such as a cylinder, and the shrinking block 8 is close to the flat tube object in the flat tube receiving groove 17 of the fixing component 4, thereby shrinking the end of the flat tube. The shrinking of the flat tube end can reduce the diameter of the flat tube end. The flat tube enters the deformation zone under the action of the axial force, and produces tangential shrinkage plastic deformation in the deformation zone, and then enters the stable zone, and finally forms a reduced end shape. The shrinking limit telescopic guide column 18, the guide column fixing plate 19 and the guide column fixing bolt 20 can ensure the stability of the shrinking block 8 during the shrinking process, and the shrinking block 8 will not be offset or shaken.

[0041] Assistance Figure 3 In this embodiment, a mold opening 21 is also provided on the expansion vertical plate 11, and the mold opening 21 and the ejection opening 14 intersect in a cross shape. The expansion mold member 13 includes a first mold head 22, a second mold head 23 and a mold mounting plate 24, the first mold head 22 is connected to one end of the mold mounting plate 24, and the second mold head 23 is connected to the other end of the mold mounting plate 24; the mold mounting plate 24 is connected to the expansion vertical plate 11; the first mold head 22 and the second mold head 23 extend from the mold opening 21. The expansion stopper 12 moves to the ejection opening 14; a mold avoidance hole 25 is formed at the center of the expansion stopper 12; the mold mounting plate 24 is in the mold avoidance hole 25, and the first mold head 22 and the second mold head 23 are on both sides of the expansion stopper 12; an avoidance channel 26 is formed between the first mold head 22 and the second mold head 23.

[0042] Specifically, the mold opening 21 and the ejector opening 14 on the flaring vertical plate 11 are centrally connected and are cross-shaped as a whole. The mold opening 21 can be installed with the flaring mold part 13, and the ejector opening 14 can allow the flaring limiter 12 to enter and exit, so that on the one hand, it can cooperate with the flat tube object to be pressed tightly. At the same time, when the flaring is completed, the ejector drive part 9 can drive the flaring limiter 12 to move forward. The forward movement of the flaring limiter 12 can apply force to the flat tube object, thereby separating the first mold head 22, the second mold head 23 and the flat tube object.

[0043] Among them, the design of the mold avoidance hole 25 and the avoidance channel 26 makes the expansion mold part 13 and the expansion limit part 12 in a ring-shaped interlocking form without interfering with each other. It should be noted that the expansion mold part 13 is fixed during the whole process, and the demoulding effect is achieved by applying force to the flat tube object through the forward movement of the expansion limit part 12.

[0044] In this embodiment, the central axis of the flat tube in the flat tube receiving groove 17, the central axis of the necking block 8 and the central axis of the expansion stopper 12 coincide. Therefore, when the flat tube object is placed in the flat tube receiving groove 17, one end of the flat tube object can be connected to the necking block 8, and the other end of the flat tube object can be connected to the expansion die pieces 13 on both sides of the expansion stopper 12. The split design of the first die head 22 and the second die head 23 leaves room for the expansion stopper 12 to move while achieving the expansion effect.

[0045] Among them, flaring is a forming method in which the flat tube material deforms radially. The condition for the flat tube material to change from elastic deformation to plastic deformation is that the material will deform when the applied force is greater than the yield point of the material. When the force applied to the mouth of the flat tube is greater than the yield point of the material, flaring can be implemented. During the flaring process, the deformation of the flat tube material starts from the contact point, and the material forming starts from the mouth of the flat tube. When the mouth of the flat tube is deformed, the material in the adjacent area will also be deformed, that is, the flat tube material deforms in the direction with the least constraint. The contact surface of the flaring process is small, which is similar to the circular line contact.

[0046] Assistance Figure 4 In this embodiment, the fixing assembly 4 also includes a quick clip 27, a support plate 28 and a support column 29. The fixed end of the quick clip 27 is connected to the support plate 28, the movable end of the quick clip 27 is connected to the contoured pressure block 16, the contoured positioning block 15 is located above the support plate 28, the bottom of the support column 29 is connected to the mounting base plate 1, and the top of the support column 29 is connected to the support plate 28.

[0047] Specifically, the quick clamp 27 can be opened or pressed, and during the pressing process, the movable end of the quick clamp 27 causes the contour pressing block 16 to press the contour positioning block 15, thereby stabilizing the flat tube object in the flat tube receiving groove 17. The support plate 28 and the support column 29 play the role of lifting the contour positioning block 15.

[0048] In this embodiment, a handle 30 is further included, and the handle 30 is distributed on both sides of the fixing assembly 4, and the handle 30 is connected to the upper end of the mounting base plate 1. The design of the handle 30 facilitates the movement of the entire EGR cooler flat tube expansion and contraction device.

[0049] The embodiment of the present invention further provides a method for expanding and shrinking a flat tube of an EGR cooler, using the above-mentioned device for expanding and shrinking a flat tube of an EGR cooler, comprising:

[0050] The flat tube object to be expanded and shrunken is placed in the profiling positioning block 15 of the fixing assembly 4, and the flat tube object is pressed by the profiling pressing block 16;

[0051] The shrinking drive member 6 of the shrinking assembly 2 drives the shrinking block 8 to shrink the shrinking end of the flat tube object, the shrinking drive member 6 drives the shrinking block 8 to press the flat tube object against the expanding assembly 3, and the expanding die member 13 of the expanding assembly 3 expands the expanding end of the flat tube object;

[0052] After the expansion and contraction of the flat tube object is completed, the ejection driving member 9 is started, and the ejection driving member 9 drives the expansion limiting member 12 to eject the flat tube object from the expansion die member 13.

[0053] In this embodiment, the ejection drive member 9 drives the expansion stop member 12 to move a stroke greater than the length of the expansion mold member 13 exposed from the expansion vertical plate 11;

[0054] When the expansion stopper 12 ejects the flat tube object, the shrinking driving member 6 drives the shrinking block 8 to separate from the flat tube object.

[0055] Among them, the shrinking of the flat tube end can reduce the diameter of the flat tube end, and the flat tube enters the deformation zone under the action of axial force, produces tangential shrinkage plastic deformation in the deformation zone, and then enters the stable zone, and finally forms a reduced end shape. The shrinking block 8 can be ensured to be stable during the shrinking process by the shrinking limit telescopic guide column 18, the guide column fixing plate 19 and the guide column fixing bolt 20, so as to prevent the shrinking block 8 from deflecting or shaking.

[0056] Flaring is a forming method in which the flat tube material deforms radially. The condition for the flat tube material to change from elastic deformation to plastic deformation is that the material will deform when the applied force is greater than the yield point of the material. When the force applied to the mouth of the flat tube is greater than the yield point of the material, the flaring can be implemented. During the flaring process, the deformation of the flat tube material starts from the contact point, and the material forming starts from the mouth of the flat tube. When the mouth of the flat tube is deformed, the material in the adjacent area will also be deformed, that is, the flat tube material deforms in the direction with the least constraint. The contact surface of the flaring process is small, which is similar to the circular line contact.

[0057] In summary, the present invention is provided with a mounting base plate 1, a shrinking component 2, an expanding component 3 and a fixing component 4; the shrinking component 2 is arranged at one end of the mounting base plate 1, the expanding component 3 is arranged at the other end of the mounting base plate 1, and the fixing component 4 is arranged between the shrinking component 2 and the expanding component 3; the shrinking component 2 includes a shrinking fixing seat 5, a shrinking driving member 6, a shrinking adapter plate 7 and a shrinking block 8; the shrinking fixing seat 5 is connected to the mounting base plate 1, the shrinking driving member 6 is connected to the shrinking fixing seat 5, and the driving shaft of the shrinking driving member 6 passes through the shrinking fixing seat 5 and is connected to the shrinking adapter plate 7; the shrinking block 8 is connected to the shrinking adapter plate 7; the expanding component 3 includes an ejection driving member The movable member 9, the flaring fixed seat 10, the flaring vertical plate 11, the flaring stopper 12 and the flaring die member 13; the ejection drive member 9 is connected to the flaring fixed seat 10, the flaring vertical plate 11 is formed with an ejection opening 14, the flaring stopper 12 is connected to the driving shaft of the ejection drive member 9, and the flaring stopper 12 corresponds to the ejection opening 14; the flaring die member 13 is connected to the flaring vertical plate 11; the fixed assembly 4 includes a profiling positioning block 15 and a profiling pressing block 16; the profiling positioning block 15 is formed with a flat tube receiving groove 17, the profiling pressing block 16 is arranged above the profiling positioning block 15, and the flat tube receiving groove 17 is between the shrinking block 8 and the flaring die member 13. The shrinking drive member 6, such as a cylinder, can drive the shrinking block 8 to move, and the shrinking block 8 is close to the flat tube object in the flat tube receiving groove 17 of the fixed assembly 4, thereby shrinking the end of the flat tube. The mold opening 21 and the ejection opening 14 on the expansion plate 11 are connected at the center and are cross-shaped as a whole. The mold opening 21 can be installed with the expansion mold part 13, and the ejection opening 14 can be used for the expansion limiter 12 to enter and exit, so that on the one hand, it can cooperate with the flat tube object to be pressed tightly. At the same time, when the expansion is completed, the ejection drive 9 can drive the expansion limiter 12 to move forward. The expansion limiter 12 can exert force on the flat tube object during the forward movement process, thereby separating the first mold head 22, the second mold head 23 and the flat tube object. The design of the mold avoidance hole 25 and the avoidance channel 26 makes the expansion mold part 13 and the expansion limiter 12 in the form of annular interlocking, and will not interfere with each other. It should be noted that the expansion mold part 13 is fixed during the whole process, but the demoulding effect is achieved by applying force to the flat tube object during the forward movement of the expansion limiter 12. When the flat tube object is placed in the flat tube receiving groove 17, one end of the flat tube object can be connected to the shrinking block 8, and the other end of the flat tube object can be connected to the expansion mold parts 13 on both sides of the expansion limiter 12. The split design of the first mold head 22 and the second mold head 23 leaves room for the expansion limiter 12 to move while achieving the expansion effect. The quick clamp 27 can be opened or pressed together. During the pressing process, the movable end of the quick clamp 27 causes the profiling pressing block 16 to press the profiling positioning block 15, thereby keeping the flat tube object in the flat tube receiving groove 17 stable. The support plate 28 and the support column 29 play the role of lifting the profiling positioning block 15.The present invention can make the fins easily installed in the flat tubes, and the pressed flat tubes can easily pass through the grooves on the tube plates, thereby greatly improving production efficiency, improving product quality, reducing defective rates, and reducing costs.

[0058] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A method for expanding and shrinking an EGR cooler flat tube, the EGR cooler flat tube expanding and shrinking device comprising a mounting base (1), a shrinking component (2), an expanding component (3) and a fixing component (4); the shrinking component (2) is arranged at one end of the mounting base (1), the expanding component (3) is arranged at the other end of the mounting base (1), and the fixing component (4) is arranged between the shrinking component (2) and the expanding component (3); the shrinking component (2) comprises a shrinking fixing seat (5), a shrinking driving member (6), a shrinking adapter plate (7) and a shrinking block (8); the shrinking fixing seat (5) is connected to the mounting base (1), the shrinking driving member (6) is connected to the shrinking fixing seat (5), the driving shaft of the shrinking driving member (6) passes through the shrinking fixing seat (5) and is connected to the shrinking adapter plate (7); the shrinking block (8) is connected to the shrinking adapter plate (7); The flaring assembly (3) comprises an ejection drive member (9), an flaring fixed seat (10), an flaring vertical plate (11), an flaring stopper (12) and an flaring die member (13); the ejection drive member (9) is connected to the flaring fixed seat (10), an ejection opening (14) is formed on the flaring vertical plate (11), the flaring stopper (12) is connected to the driving shaft of the ejection drive member (9), and the flaring stopper (12) corresponds to the ejection opening (14); the flaring die member (13) is connected to the flaring vertical plate (11); the fixing assembly (4) comprises a profiling positioning block (15) and a profiling pressing block (16); the profiling positioning block (15) is formed with a flat tube accommodating groove (17), the profiling pressing block (16) is arranged above the profiling positioning block (15), and the flat tube accommodating groove (17) is located between the shrinking block (8) and the flaring die member (13), characterized in that: The method includes: Placing the flat tube object to be expanded and shrunken in the contour positioning block (15) of the fixing component (4), and pressing the flat tube object with the contour pressing block (16); The shrinking drive member (6) of the shrinking component (2) drives the shrinking block (8) to shrink the shrinking end of the flat tube object, the shrinking drive member (6) drives the shrinking block (8) to press the flat tube object against the expanding component (3), and the expanding mold member (13) of the expanding component (3) expands the expanding end of the flat tube object; After the expansion and contraction of the flat tube object is completed, the ejection driving member (9) is started, and the ejection driving member (9) drives the expansion limiting member (12) to eject the flat tube object from the expansion die member (13).

2. The method for expanding and shrinking the flat tube of an EGR cooler according to claim 1, characterized in that: The ejection drive member (9) drives the expansion stop member (12) to move a stroke greater than the length of the expansion mold member (13) exposed from the expansion vertical plate (11); When the expansion limiting member (12) ejects the flat tube object, the shrinking driving member (6) drives the shrinking block (8) to separate from the flat tube object.

3. The method for expanding and shrinking a flat tube of an EGR cooler according to claim 1, characterized in that: The shrinking assembly (2) further comprises a shrinking limit telescopic guide column (18), a guide column fixing plate (19) and a guide column fixing bolt (20); one end of the shrinking limit telescopic guide column (18) is connected to the shrinking adapter plate (7), and the other end of the shrinking limit telescopic guide column (18) passes through the shrinking fixing seat (5) and is connected to the guide column fixing plate (19); the guide column fixing plate (19) is connected to the shrinking fixing seat (5) via the guide column fixing bolt (20).

4. The method for expanding and shrinking the flat tube of an EGR cooler according to claim 3, characterized in that: The flared vertical plate (11) is also provided with a mold opening (21), and the mold opening (21) and the ejection opening (14) intersect in a cross shape.

5. The method for expanding and shrinking the flat tube of an EGR cooler according to claim 4, characterized in that: The expansion die member (13) comprises a first die head (22), a second die head (23) and a die mounting plate (24), wherein the first die head (22) is connected to one end of the die mounting plate (24), and the second die head (23) is connected to the other end of the die mounting plate (24); The mold mounting plate (24) is connected to the flaring vertical plate (11); the first mold head (22) and the second mold head (23) extend from the mold opening (21).

6. The method for expanding and shrinking the flat tube of an EGR cooler according to claim 5, characterized in that: The expansion stopper (12) moves to the ejection opening (14); a mold avoidance hole (25) is formed at the center of the expansion stopper (12); The mold mounting plate (24) is located in the mold avoidance hole (25); the first mold head (22) and the second mold head (23) are located on both sides of the expansion stopper (12); and an avoidance channel (26) is formed between the first mold head (22) and the second mold head (23).

7. The method for expanding and shrinking the flat tube of an EGR cooler according to claim 6, characterized in that: The central axis of the flat tube in the flat tube accommodating groove (17), the central axis of the necking block (8) and the central axis of the expansion stopper (12) coincide with each other.

8. The method for expanding and shrinking the flat tube of an EGR cooler according to claim 7, characterized in that: The fixing assembly (4) further comprises a quick clamp (27), a support plate (28) and a support column (29), wherein the fixed end of the quick clamp (27) is connected to the support plate (28), the movable end of the quick clamp (27) is connected to the contoured pressing block (16), the contoured positioning block (15) is located above the support plate (28), the bottom of the support column (29) is connected to the mounting base plate (1), and the top of the support column (29) is connected to the support plate (28).

9. The method for expanding and shrinking the flat tube of an EGR cooler according to claim 8, characterized in that: It also comprises a handle (30), the handle (30) being distributed on both sides of the fixing assembly (4), and the handle (30) being connected to the upper end of the mounting base plate (1).

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