A machining method and device for a complex curved thin-walled part guide tube

Abstract

The application relates to a machining method and device for a complex curved surface thin-wall part guide pipe, and belongs to the field of aero-engines. The method comprises the following steps: S1, designing and manufacturing a drawing die, a forming die and a flanging die according to the curved surface coordinates of the guide pipe; S2, simulating the forming machining process of the guide pipe to determine the unfolding amount of a blank plate; S3, bending the blank plate by using the drawing die to form a guide pipe leading edge on the blank plate; S4, stamping the blank plate by using the forming die to form a guide pipe basin direction, a guide pipe back direction and a guide pipe trailing edge on the blank plate; S5, flanging the blank plate by using the flanging die to form a guide pipe flange on the blank plate; S6, welding two guide pipe trailing edges; S7, machining a plurality of guide pipe micro-holes on the guide pipe leading edge; and S8, verifying the machining effect of the guide pipe by using a cavity simulation part. The application is favorable for reducing the forming manufacturing and assembly difficulty of a complex inner cavity guide pipe of a turbine blade of an aero-engine.

Description

Technical Field

[0001] This invention relates to the field of aero-engines, and in particular to a method and apparatus for processing a guide tube for a complex curved thin-walled component. Background Technology

[0002] Turbine components are among the components of aero engines that bear the heaviest thermal and mechanical loads. Due to the particularly harsh working environment of turbine blades, they are subjected to high temperatures, high pressures, and gas impacts after combustion during the engine cycle. Therefore, turbine blade cooling manufacturing technology has been listed as one of the key technologies of modern aero engines.

[0003] Currently, the key technologies in turbine blade manufacturing mainly lie in high-efficiency air-cooling design and manufacturing technology, materials technology, and surface coating protection technology. As the thrust-to-weight ratio of engines continues to increase, the turbine inlet temperature is getting higher and higher. As the requirements of engines on turbine blades become more and more stringent, the precision requirements of turbine blades are also getting higher and higher. For complex multi-stage hollow turbine blades, thin-walled components need to be assembled into the blade cavity to form a double-layer structure to achieve the effect of blade cooling.

[0004] Therefore, machining thin-walled parts presents certain challenges, especially for irregularly shaped internal cavities. The formed shape needs to match the shape of the blade's internal cavity, which is particularly challenging for the machining and assembly of blades with blind cavities. The clearance between the fit must meet specific airflow requirements to satisfy assembly specifications. Because the blade body has holes of varying regularity, corresponding holes need to be machined on the guide tube for assembly. During assembly, the holes in the guide tube must coincide with the micropores in the blade's internal cavity to achieve the desired assembly. This places higher demands on the forming and manufacturing of the guide tube. This is especially true for blades with blind holes in their internal cavities, making it even more difficult to guarantee the blade assembly requirements. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method and apparatus for processing a complex curved thin-walled guide tube, so as to solve the above-mentioned problem.

[0006] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A method for processing a complex curved surface thin-walled component guide tube, comprising the following steps:

[0007] S1: Design and manufacture stretching dies, forming dies, and flanging dies based on the curved surface coordinates of the guide tube;

[0008] S2: Simulate the forming process of the guide tube in 3D design software to determine the unfolding amount of the blank;

[0009] S3: Using the stretching die described in step S1, the blank plate described in step S2 is bent to form the leading edge of the guide tube on the blank plate;

[0010] S4: stamping forming the blank plate after stretching in step S3 by using the forming die in step S1, forming the nozzle back, the nozzle back and the nozzle trailing edge on the blank plate;

[0011] S5: flanging the blank plate after stamping forming in step S4 by using the flanging die in step S1, forming the nozzle flange on the nozzle back and the nozzle back of the blank plate;

[0012] S6: welding two nozzle trailing edges;

[0013] S7: processing a plurality of nozzle micro-holes on the nozzle leading edge to form the nozzle;

[0014] S8: verifying the processing effect of the nozzle by using a cavity simulation piece.

[0015] The beneficial effects of the present application are: the processing device for the nozzle is designed and manufactured by using the curved surface coordinates of the designed nozzle, which is beneficial to make the manufacturing of the nozzle and the subsequent assembly with the inner cavity of the turbine blade more targeted, the stretching die, the forming die and the flanging die realize the stamping surface processing of the nozzle with complex curved surface and thin wall through forming stamping, and cooperate with the processing of the nozzle micro-holes, which is beneficial to reduce the forming manufacturing difficulty of the nozzle with complex curved surface and thin wall in the turbine blade of the aero-engine, and the processing effect of the nozzle is verified by using the cavity simulation piece, which is beneficial to optimize the process method of the assembly and improve the reliability in the subsequent actual assembly process with the inner cavity of the turbine blade.

[0016] Another technical solution for solving the above technical problems is as follows: a processing device for a nozzle with complex curved surface and thin wall, comprising: a stretching die, a forming die and a flanging die; the stretching die comprises: a stretching upper die, a stretching lower die and a plurality of stretching die guide columns, the stretching upper die and the stretching lower die are connected through the stretching die guide columns, and a blank plate to be bent is adaptively arranged on the stretching lower die; the forming die comprises: a forming upper die, a forming lower die, a plurality of forming die guide columns and a core, the forming upper die and the forming lower die are connected through the forming die guide columns, the core is arranged on the forming lower die, and the blank plate to be stamping formed is adaptively arranged on the core; the flanging die comprises: a flanging upper die, a flanging lower die, a nozzle placing die, an eccentric wheel mechanism and a plurality of flanging die guide columns, the flanging upper die and the flanging lower die are connected through the flanging die guide columns, the nozzle placing die and the eccentric wheel mechanism are both installed on the flanging lower die, the blank plate to be flanged is adaptively arranged on the nozzle placing die and abuts against the eccentric wheel mechanism.

[0017] The beneficial effects of the present application are that the stretching die is beneficial to stamping the blank plate to form the front edge of the flow guide pipe through the closing of the stretching upper die and the stretching lower die, the forming die is beneficial to stamping the blank plate placed on the core to form the front edge, the back edge and the tail edge of the flow guide pipe through the closing of the forming upper die and the forming lower die, and the flanging die is beneficial to stamping the blank plate fixed between the flow guide pipe placing die and the eccentric wheel mechanism to form the flange of the flow guide pipe through the closing of the flanging upper die and the flanging lower die, thereby reducing the forming and manufacturing difficulty of the complex inner cavity flow guide pipe of the turbine blade of the aero-engine.

[0018] Based on the above technical solution, the present application can be further improved as follows.

[0019] Further, the stretching lower die comprises an elastic device, a plurality of discharging screws, a pressure ring, a stretching punch and a stretching lower bottom plate; the discharging screw gap passes through the stretching lower bottom plate and is connected with the pressure ring, the stretching punch is installed at the top end of the pressure ring, and the elastic device gap passes through the stretching lower bottom plate and is connected with the pressure ring.

[0020] The beneficial effects of the above further scheme are that the elastic device gap passes through the stretching lower bottom plate and is connected with the pressure ring, which is beneficial to upwardly top the stretching punch on the pressure ring and complete the closing with the stretching upper die, and the discharging screw gap passes through the stretching lower bottom plate and is connected with the pressure ring, which is beneficial to providing guidance for the upward and downward displacement of the pressure ring and the stretching punch and ensuring the stability of the closing.

[0021] Further, the stretching upper die comprises a stretching upper bottom plate, a stretching concave die, a plurality of stretching upper die fixing pins and a stretching upper die handle; the stretching concave die is installed at the bottom end of the stretching upper bottom plate through the stretching upper die fixing pins, the stretching upper die handle is arranged at the top end of the stretching upper bottom plate, and a plurality of stretching die guide columns are fixed around the stretching lower bottom plate and pass through the stretching upper bottom plate in gaps; the blank plate to be bent is placed on the stretching punch and is stamped to form the front edge of the flow guide pipe when the stretching concave die and the stretching punch are closed.

[0022] The beneficial effects of the above further scheme are that the stretching upper die handle installed on the stamping machine is beneficial to realizing the closing by using the pressure of the stamping machine, and further realizing the stamping of the blank plate, and the stretching die guide column is beneficial to providing guidance for the closing of the stretching die and ensuring the stability during the closing.

[0023] Further, the forming lower die comprises a forming lower bottom plate, a forming concave die and a plurality of forming lower die fixing pins; the forming concave die is installed at the top end of the forming lower bottom plate through the forming lower die fixing pins, and the core is arranged at the top end of the forming concave die.

[0024] The beneficial effect of the further scheme is that the core is arranged at the top end of the forming concave die, which is beneficial to place the blank plate having formed the front edge of the guide vane, and to form the guide vane back, the guide vane back and the guide vane tail edge under the cooperation of the forming upper die.

[0025] Further, the forming upper die comprises a forming upper bottom plate, a forming convex die, a plurality of forming upper die fixing pins and a forming upper die handle; the forming convex die is arranged at the bottom end of the forming upper bottom plate through the forming upper die fixing pins, and the forming upper die handle is arranged at the top end of the forming upper bottom plate; a plurality of forming die guide columns are fixed around the forming lower bottom plate and pass through the forming upper bottom plate with a gap; the blank plate to be formed is punched to form the guide vane back, the guide vane back and the guide vane tail edge when the forming convex die and the forming concave die are closed.

[0026] The beneficial effect of the further scheme is that the forming upper die handle is arranged on the punch press, which is beneficial to drive the displacement of the forming upper die by the pressure of the punch press, and to realize the closing of the forming lower die.

[0027] Further, the flanging upper die comprises a flanging upper bottom plate, a fixed plate, a plurality of flanging upper die fixing pins, a flanging convex die and a flanging upper die handle; the fixed plate is arranged at the bottom end of the flanging upper bottom plate through the flanging upper die fixing pins, the flanging convex die is arranged at the bottom end of the fixed plate, and the flanging upper die handle is arranged at the top end of the flanging upper bottom plate.

[0028] The beneficial effect of the further scheme is that the flanging upper die handle is arranged on the punch press, which is beneficial to drive the displacement of the flanging upper die by the pressure of the punch press, and to realize the flanging of the guide vane by cooperating with the flanging lower die and the guide vane placing die.

[0029] Further, the flanging lower die comprises a flanging lower bottom plate and a plurality of flanging lower die fixing pins, and the guide vane placing die comprises a fixed concave die, a movable concave die, an inner guide column and a spring; the fixed concave die is arranged at the top end of the flanging lower bottom plate through the flanging lower die fixing pins, the movable concave die is movably arranged above the flanging lower bottom plate, the inner guide column passes through the fixed concave die and the movable concave die, the spring is sleeved on the inner guide column, and the two ends of the spring are connected with the inner wall of the fixed concave die and the inner wall of the movable concave die respectively; the blank plate to be flanged is arranged on the side of the fixed concave die close to the movable concave die and abuts against the movable concave die.

[0030] The beneficial effect of the further scheme is that the inner guide column and the spring are beneficial to adjust the distance between the movable concave die and the fixed concave die, so as to clamp the blank plate placed on the fixed concave die, and facilitate the subsequent punching of the blank plate when the flanging upper die is closed downward.

[0031] Further, the eccentric wheel mechanism comprises a fixed column, a rotating column and a rotating handle; the fixed column is fixedly installed at the top end of the flanging lower bottom plate, the rotating column is rotatably installed at the top end of the fixed column, the fixed column and the rotating column are arranged in a non-coaxial manner, and the rotating handle is installed on the side wall of the rotating column and abuts against the movable concave die when the rotating handle drives the rotating column to rotate.

[0032] The fixed column and the rotating column are arranged in a non-coaxial manner, which is beneficial to abutting the rotating column against the movable concave die and driving the movable concave die to displace when the rotating handle drives the rotating column to rotate, thereby realizing clamping of the blank plate. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A processing method flowchart is provided for the embodiments of the present application;

[0034] Figure 2 A structure schematic diagram of the stretching upper die is provided for the embodiments of the present application;

[0035] Figure 3 A schematic diagram of the blank plate after being bent by the stretching upper die is provided for the embodiments of the present application;

[0036] Figure 4 A structure schematic diagram of the forming die is provided for the embodiments of the present application;

[0037] Figure 5 A schematic diagram of the blank plate after being stamped and formed by the forming die is provided for the embodiments of the present application;

[0038] Figure 6 A side view of the flanging die is provided for the embodiments of the present application;

[0039] Figure 7 A front view of the flanging die is provided for the embodiments of the present application;

[0040] Figure 8 A structure schematic diagram of the blank plate after being flanged by the flanging die is provided for the embodiments of the present application;

[0041] Figure 9 A processing schematic diagram of step S6 is provided for the embodiments of the present application;

[0042] Figure 10 A processing schematic diagram of step S7 is provided for the embodiments of the present application;

[0043] Figure 11 A processing schematic diagram of step S8 is provided for the embodiments of the present application.

[0044] In the drawings, the components represented by the respective reference numerals are listed as follows:

[0045] 1. Drawing die; 2. Forming die; 3. Flanging die; 4. Guide tube; 5. Cavity simulation part; 11. Upper drawing die; 12. Lower drawing die; 13. Drawing die guide post; 21. Upper forming die; 22. Lower forming die; 23. Forming die guide post; 24. Core; 31. Upper flanging die; 32. Lower flanging die; 33. Guide tube placement die; 34. Eccentric wheel mechanism; 35. Flanging die guide post; 41. Leading edge of guide tube; 42. Guide tube facing outwards; 43. Guide tube facing backwards; 44. Tail edge of guide tube; 45. Guide tube flanging; 111. Upper drawing base plate; 112. Drawing die cavity; 113. Upper drawing die fixing pin; 114. Upper drawing die handle; 121. Elastic force device; 122. Ejector screw 123. Pin; 124. Pressure ring; 125. Stretch punch; 211. Stretch lower base plate; 212. Forming upper base plate; 213. Forming upper die fixing pin; 214. Forming upper die handle; 221. Forming lower base plate; 222. Forming die cavity; 223. Forming lower die fixing pin; 311. Flanging upper base plate; 312. Fixing plate; 313. Flanging upper die fixing pin; 314. Flanging punch; 315. Flanging upper die handle; 321. Flanging lower base plate; 322. Flanging lower die fixing pin; 331. Fixed die cavity; 332. Movable die cavity; 333. Inner guide post; 334. Spring; 341. Fixed post; 342. Rotating post; 343. Rotating handle; 441. Micro-hole of guide tube. Detailed Implementation

[0046] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0047] like Figure 1 As shown, a method for processing a complex curved thin-walled guide tube includes the following steps:

[0048] S1: Design and manufacture stretching die 1, forming die 2 and flanging die 3 according to the curved surface coordinates of guide tube 4;

[0049] S2: Simulate the forming process of the guide pipe 4 in 3D design software to determine the unfolding amount of the blank;

[0050] S3: Using the stretching die 1 described in step S1, the blank plate described in step S2 is bent to form the leading edge 41 of the guide tube on the blank plate;

[0051] S4: The blank plate stretched in step S3 is stamped and formed using the forming mold 2 in step S1, and a guide tube basin 42, a guide tube back 43 and a guide tube tail edge 44 are formed on the blank plate.

[0052] S5: flanging the blank in step S4 after the stamping forming by using the flanging die 3 in step S1 to form the turbine guide vane flange 45 on the turbine guide vane basin facing 42 and the turbine guide vane back facing 43 of the blank;

[0053] S6: welding two turbine guide vane trailing edges 44;

[0054] S7: processing a plurality of turbine guide vane micro-holes 441 on the turbine guide vane leading edge 41 to form the turbine guide vane 4;

[0055] S8: verifying the processing effect of the turbine guide vane 4 by using the cavity simulation piece 5.

[0056] It should be noted that in step S3, the blank forming the turbine guide vane leading edge 41 is V-shaped, as shown in Figure 3

[0057] Since the original blank is a plate structure, and the turbine guide vane 4 needs to be formed into a tubular structure after multiple stamping, in step S6, the two turbine guide vane trailing edges 44 are spot-welded together, which is beneficial to form a tubular structure;

[0058] In step S7, a plurality of turbine guide vane micro-holes 441 are processed on the turbine guide vane leading edge 41 according to the hole position corresponding requirement on the turbine blade inner cavity by the method of electric spark drilling to form the turbine guide vane 4;

[0059] In step S8, the cavity simulation piece 5 verifies the processing effect of the turbine guide vane 4 through the assembly principle of the shaft hole correspondence.

[0060] The beneficial effects of the present application are: the processing device of the turbine guide vane is designed and manufactured by using the curved surface coordinates of the designed turbine guide vane, which is beneficial to make the manufacturing of the turbine guide vane and the subsequent assembly with the inner cavity of the turbine blade more targeted, the stretch die, the forming die and the flanging die realize the stamping profile processing of the complex curved surface thin-walled part turbine guide vane through forming stamping, and cooperate with the processing of the turbine guide vane micro-hole, which is beneficial to reduce the forming manufacturing difficulty of the complex inner cavity turbine guide vane of the aero-engine turbine blade, the processing effect of the turbine guide vane is verified by using the cavity simulation piece, which is beneficial to optimize the process method of assembly and improve the reliability in the subsequent actual assembly process with the inner cavity of the turbine blade.

[0061] As shown in Figures 2 to 8 A processing device of a complex curved surface thin-walled part turbine guide vane, comprising: a stretch die 1, a forming die 2 and a flanging die 3;

[0062] The stretch die 1 comprises a stretch upper die 11, a stretch lower die 12 and a plurality of stretch die guide columns 13, the stretch upper die 11 and the stretch lower die 12 are slidably connected through the stretch die guide columns 13, and a blank to be bent is adaptively arranged on the stretch lower die 12;​

[0063] The forming mold 2 includes: an upper forming mold 21, a lower forming mold 22, multiple forming mold guide pillars 23 and a core 24. The upper forming mold 21 and the lower forming mold 22 are slidably connected through the forming mold guide pillars 23. The core 24 is disposed on the lower forming mold 22, and the blank to be stamped is adapted to be disposed on the core 24.

[0064] The flanging mold 3 includes: an upper flanging mold 31, a lower flanging mold 32, a guide tube placement mold 33, an eccentric wheel mechanism 34, and a plurality of flanging mold guide posts 35. The upper flanging mold 31 and the lower flanging mold 32 are slidably connected by the flanging mold guide posts 35. The guide tube placement mold 33 and the eccentric wheel mechanism 34 are both installed on the lower flanging mold 32. The blank to be flanged is adapted to be placed on the guide tube placement mold 33 and abuts against the eccentric wheel mechanism 34.

[0065] The beneficial effects of this invention are as follows: the stretching die, through the closing of the upper and lower stretching dies, facilitates the stamping of the leading edge of the guide tube on the blank plate; the forming die, through the closing of the upper and lower forming dies, facilitates the stamping of the blank plate placed on the core to form the basin-shaped, back-shaped, and tail-shaped edges of the guide tube; and the flanging die, through the closing of the upper and lower flanging dies, facilitates the stamping of the blank plate fixed between the guide tube placement die and the eccentric wheel mechanism to form the guide tube flanging, thereby reducing the difficulty of forming and manufacturing the guide tube of the complex internal cavity of the aero-engine turbine blade.

[0066] Preferred, such as Figure 2 As shown, the lower stretching die 12 includes: a spring forceper 121, a plurality of stripper screws 122, a pressure ring 123, a stretching punch 124, and a lower stretching base plate 125; the stripper screws 122 pass through the lower stretching base plate 125 and are connected to the pressure ring 123; the stretching punch 124 is mounted on the top of the pressure ring 123; the spring forceper 121 passes through the lower stretching base plate 125 and is connected to the pressure ring 123.

[0067] The advantages of adopting the above preferred solution are: the gap of the elastic device passes through the lower base plate of the stretching and is connected to the pressure ring, which is conducive to pushing the stretching punch on the pressure ring upward and cooperating with the upper stretching die to complete the mold closing; the gap of the stripper screw passes through the lower base plate of the stretching and is connected to the pressure ring, which is conducive to providing guidance for the vertical displacement of the pressure ring and the stretching punch, and ensuring the stability of the mold closing.

[0068] Preferred, such as Figure 2 and Figure 3As shown in the figure, the stretching upper die 11 comprises a stretching upper base plate 111, a stretching concave die 112, a plurality of stretching upper die fixing pins 113 and a stretching upper die handle 114; the stretching concave die 112 is installed at the bottom end of the stretching upper base plate 111 through the stretching upper die fixing pins 113, and the stretching upper die handle 114 is arranged at the top end of the stretching upper base plate 111; a plurality of stretching die guide columns 13 are fixedly arranged around the stretching lower base plate 125 and gap through the stretching upper base plate 111; the blank to be bent is placed on the stretching convex die 124 and stamped to form the leading edge 41 of the nozzle when the stretching concave die 112 and the stretching convex die 124 are closed.

[0069] The beneficial effects of the above preferred scheme are that the stretching upper die handle is installed on the stamping machine, which is beneficial to realize the closing of the die by using the pressure of the stamping machine, and then realize the stamping of the blank; the stretching die guide column is beneficial to provide guidance for the closing of the stretching die, and ensure the stability during closing.

[0070] Preferably, as shown in the figure, Figure 4 As shown in the figure, the forming lower die 22 comprises a forming lower base plate 221, a forming concave die 222 and a plurality of forming lower die fixing pins 223; the forming concave die 222 is installed at the top end of the forming lower base plate 221 through the forming lower die fixing pins 223, and the core 24 is arranged at the top end of the forming concave die 222.

[0071] The beneficial effects of the above preferred scheme are that the core is arranged at the top end of the forming concave die, which is beneficial to place the blank which has formed the leading edge of the nozzle, and form the nozzle front, the nozzle back and the nozzle trailing edge under the cooperation of the closing of the forming upper die.

[0072] Preferably, as shown in the figure, Figure 4 and Figure 5 As shown in the figure, the forming upper die 21 comprises a forming upper base plate 211, a forming convex die 212, a plurality of forming upper die fixing pins 213 and a forming upper die handle 214; the forming convex die 212 is installed at the bottom end of the forming upper base plate 211 through the forming upper die fixing pins 213, and the forming upper die handle 214 is arranged at the top end of the forming upper base plate 211; a plurality of forming die guide columns 23 are fixedly arranged around the forming lower base plate 221 and gap through the forming upper base plate 211; the blank to be stamped is stamped to form the nozzle front 42, the nozzle back 43 and the nozzle trailing edge 44 when the forming convex die 212 and the forming concave die 222 are closed.

[0073] The beneficial effects of the above preferred scheme are that the forming upper die handle is installed on the stamping machine, which is beneficial to drive the displacement of the forming upper die by using the pressure of the stamping machine, and realize the closing of the die in cooperation with the forming lower die.

[0074] Preferably, as shown in the figure, Figure 6 andFigure 7 As shown in the drawings, the flanging upper die 31 comprises a flanging upper base plate 311, a fixed plate 312, a plurality of flanging upper die fixing pins 313, a flanging punch 314 and a flanging upper die handle 315; the fixed plate 312 is installed at the bottom end of the flanging upper base plate 311 through the flanging upper die fixing pins 313, the flanging punch 314 is installed at the bottom end of the fixed plate 312, and the flanging upper die handle 315 is installed at the top end of the flanging upper base plate 311.

[0075] The beneficial effect of the above preferred scheme is that the flanging upper die handle is installed on the stamping machine, which is conducive to driving the displacement of the flanging upper die by the pressure of the stamping machine, and cooperates with the flanging lower die and the flow guide pipe placement die to realize the stamping forming of the flow guide pipe flanging.

[0076] Preferably, as shown in the drawings, Figure 6 and Figure 7 As shown in the drawings, the flanging lower die 32 comprises a flanging lower base plate 321 and a plurality of flanging lower die fixing pins 322, and the flow guide pipe placement die 33 comprises a fixed concave die 331, a movable concave die 332, an inner guide column 333 and a spring 334; the fixed concave die 331 is installed at the top end of the flanging lower base plate 321 through the flanging lower die fixing pins 322, the movable concave die 332 is movably arranged above the flanging lower base plate 321, the inner guide column 333 passes through the fixed concave die 331 and the movable concave die 332, the spring 334 is sleeved on the inner guide column 333, and both ends are connected with the inner wall of the fixed concave die 331 and the inner wall of the movable concave die 332 respectively, and the blank to be flanged is adaptively arranged on the side of the fixed concave die 331 close to the movable concave die 332 and abuts against the movable concave die 332.

[0077] The beneficial effect of the above preferred scheme is that the inner guide column and the spring are conducive to adjusting the distance between the movable concave die and the fixed concave die, so as to clamp the blank placed on the fixed concave die, and facilitate the subsequent stamping of the blank by the flanging upper die.

[0078] Preferably, as shown in the drawings, Figure 6 and Figure 7 As shown in the drawings, the eccentric mechanism 34 comprises a fixed column 341, a rotating column 342 and a rotating handle 343; the fixed column 341 is fixedly installed at the top end of the flanging lower base plate 321, the rotating column 342 is rotatably installed at the top end of the fixed column 341, the fixed column 341 and the rotating column 342 are arranged non-coaxially, the rotating handle 343 is installed on the side wall of the rotating column 342, and the rotating handle 343 abuts against the movable concave die 332 when driving the rotating column 342 to rotate.

[0079] The beneficial effect of the above preferred scheme is that the fixed column and the rotating column are arranged non-coaxially, which is beneficial to abutting the rotating column to the movable concave die when the rotating column is driven to rotate by the rotating handle, driving the movable concave die to displace, and further realizing clamping of the blank plate.

[0080] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0081] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0082] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0083] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0084] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0085] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A machining method of a complex curved thin-walled part guide tube, characterized in that, The method comprises the following steps: S1: design and manufacture a stretching die (1), a forming die (2) and a flanging die (3) according to the surface coordinates of the flow guide pipe (4); S2: simulate the forming process of the flow guide pipe (4) in a three-dimensional design software to determine the unfolding amount of the blank; S3: bend the blank in step S2 using the stretching die (1) in step S1 to form a flow guide pipe leading edge (41) on the blank; S4: stamp and form the blank after stretching in step S3 using the forming die (2) in step S1 to form a flow guide pipe basin (42), a flow guide pipe back (43) and a flow guide pipe trailing edge (44) on the blank; S5: flange the blank after stamping and forming in step S4 using the flanging die (3) in step S1 to form a flow guide pipe flange (45) on the flow guide pipe basin (42) and the flow guide pipe back (43) of the blank; S6: weld two flow guide pipe trailing edges (44); S7: process a plurality of flow guide pipe micro-holes (441) on the flow guide pipe leading edge (41) to form the flow guide pipe (4); S8: verify the processing effect of the flow guide pipe (4) using a cavity simulation piece (5); The stretching die (1) comprises a stretching upper die (11), a stretching lower die (12) and a plurality of stretching die guide columns (13), the stretching upper die (11) and the stretching lower die (12) are slidably connected through the stretching die guide columns (13), and the blank to be bent is adaptively arranged on the stretching lower die (12); The forming die (2) comprises a forming upper die (21), a forming lower die (22), a plurality of forming die guide columns (23) and a core (24), the forming upper die (21) and the forming lower die (22) are slidably connected through the forming die guide columns (23), the core (24) is arranged on the forming lower die (22), and the blank to be stamp formed is adaptively arranged on the core (24); The flanging die (3) comprises a flanging upper die (31), a flanging lower die (32), a flow guide pipe placing die (33), an eccentric wheel mechanism (34) and a plurality of flanging die guide columns (35), the flanging upper die (31) and the flanging lower die (32) are slidably connected through the flanging die guide columns (35), the flow guide pipe placing die (33) and the eccentric wheel mechanism (34) are both installed on the flanging lower die (32), the blank to be flanged is adaptively arranged on the flow guide pipe placing die (33) and abuts against the eccentric wheel mechanism (34); The flanging upper die (31) comprises a flanging upper bottom plate (311), a fixed plate (312), a plurality of flanging upper die fixed pins (313), a flanging punch (314) and a flanging upper die handle (315), the fixed plate (312) is installed at the bottom end of the flanging upper bottom plate (311) through the flanging upper die fixed pins (313), the flanging punch (314) is installed at the bottom end of the fixed plate (312), and the flanging upper die handle (315) is installed at the top end of the flanging upper bottom plate (311); The flanging lower die (32) comprises a flanging lower bottom plate (321) and a plurality of flanging lower die fixing pins (322), the draft tube placing die (33) comprises a fixed concave die (331), a movable concave die (332), an inner guide column (333) and a spring (334); the fixed concave die (331) is installed at the top end of the flanging lower bottom plate (321) through the flanging lower die fixing pins (322), the movable concave die (332) is movably arranged above the flanging lower bottom plate (321), the inner guide column (333) penetrates through the fixed concave die (331) and the movable concave die (332), the spring (334) is sleeved on the inner guide column (333), and both ends are connected with the inner wall of the fixed concave die (331) and the inner wall of the movable concave die (332) one by one, and the blank to be flanged is adaptively arranged on one side of the fixed concave die (331) close to the movable concave die (332) and abuts against the movable concave die (332); The eccentric mechanism (34) comprises a fixed column (341), a rotating column (342) and a rotating handle (343); the fixed column (341) is fixedly installed at the top end of the flanging lower bottom plate (321), the rotating column (342) is rotatably installed at the top end of the fixed column (341), the fixed column (341) and the rotating column (342) are arranged non-coaxially, and the rotating handle (343) is installed on the side wall of the rotating column (342); when the rotating handle (343) drives the rotating column (342) to rotate, the rotating handle (343) abuts against the movable concave die (332).

2. The processing method for a complex curved thin-walled guide tube according to claim 1, characterized in that, The stretching lower die (12) comprises a springer (121), a plurality of unloading screws (122), a blank holder (123), a stretching convex die (124) and a stretching lower bottom plate (125); the unloading screws (122) penetrate through the stretching lower bottom plate (125) and are connected with the blank holder (123), the stretching convex die (124) is installed at the top end of the blank holder (123), and the springer (121) penetrates through the stretching lower bottom plate (125) and is connected with the blank holder (123).

3. The processing method for a complex curved thin-walled guide tube according to claim 2, characterized in that, The stretching upper die (11) comprises a stretching upper bottom plate (111), a stretching concave die (112), a plurality of stretching upper die fixing pins (113) and a stretching upper die handle (114); the stretching concave die (112) is installed at the bottom end of the stretching upper bottom plate (111) through the stretching upper die fixing pins (113), the stretching upper die handle (114) is arranged at the top end of the stretching upper bottom plate (111), a plurality of stretching die guide columns (13) are fixedly arranged on the stretching lower bottom plate (125) and penetrate through the stretching upper bottom plate (111) in gaps; the blank to be bent is adaptively placed on the stretching convex die (124) and is stamped to form a draft tube front edge (41) when the stretching concave die (112) and the stretching convex die (124) are closed.

4. The method of claim 1, wherein the complex curved thin-walled part is a nozzle. The forming lower die (22) comprises a forming lower bottom plate (221), a forming concave die (222) and a plurality of forming lower die fixing pins (223); the forming concave die (222) is installed at the top end of the forming lower bottom plate (221) through the forming lower die fixing pins (223), and the core (24) is arranged at the top end of the forming concave die (222). ​ 5. The method of claim 4, wherein the complex curved thin-walled part is a nozzle. The forming upper die (21) comprises a forming upper bottom plate (211), a forming convex die (212), a plurality of forming upper die fixing pins (213) and a forming upper die handle (214); the forming convex die (212) is installed at the bottom end of the forming upper bottom plate (211) through the forming upper die fixing pins (213), the forming upper die handle (214) is arranged at the top end of the forming upper bottom plate (211), a plurality of the forming die guide columns (23) are fixedly arranged around the forming lower bottom plate (221) and pass through the forming upper bottom plate (211) with a gap; the blank to be formed by stamping is stamped to form the nozzle basin (42), the nozzle back (43) and the nozzle trailing edge (44) when the forming convex die (212) and the forming concave die (222) are closed. ​

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