Flanging forming method of cross flame tube seat

Abstract

The invention discloses a flange forming method of a cross flame tube seat, which comprises the following steps of: 1) pre-processing: respectively forming a notch on each of two sides of a flange part; excess materials at the bottom end of the bent edge part are cut off; the sharp edge of the bent edge part is rounded; (2) edge pre-bending is conducted, specifically, the edge bending part is subjected to edge pre-bending to form a preformed blank, and stress relief heat treatment is conducted on the preformed blank; (3) edge bending is conducted, specifically, the preformed blank is clamped, and the edge bending part is manually bent to 90 degrees through a thermal forming technology to form an edge bending blank; (4) shape correction is conducted, specifically, shape correction is conducted on the flanged blank; and 5) machining: machining the structural characteristics of the flanged blank to obtain the cross flame tube seat. According to the forming method, the problem of cracking of the bent edge part is effectively avoided, the forming quality of the cross flame tube seat is ensured, and the production cost is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of parts processing, and in particular to a bending forming method for a cross-fire tube seat. Background Art

[0002] like Figure 2 The cross-fire tube seat shown is an indispensable part of the engine's combustion system, which can ensure the coordinated combustion of each flame tube in the combustion chamber and the stable operation of the combustion chamber. Its molding quality has a great influence on the performance of the engine. The cross-fire tube seat is made of sheet metal, with small size and complex structure. It is easy to cause cracks in the bent edge during the molding process, resulting in product scrapping. Summary of the invention

[0003] In view of the above defects or deficiencies in the prior art, it is desired to provide a bending forming method for a cross-fire tube seat, which effectively avoids the problem of cracking at the bending portion, ensures the forming quality of the cross-fire tube seat, and effectively reduces the production cost.

[0004] The present invention provides a method for bending a cross-fire tube seat, comprising the following steps:

[0005] 1) Pre-processing: mill the cylindrical blank and open a notch on both sides of the bending part; then perform wire cutting on the bottom end of the bending part to remove the excess material; then perform clamp trimming on the bending part to round its sharp edge;

[0006] 2) Pre-bending: pre-bending the bending part of the cylindrical blank by a pre-forming die, so that it is bent outward by 30°-60° to form a pre-formed blank, and the pre-formed blank is subjected to stress relief heat treatment;

[0007] 3) Flanging: clamp the preformed blank through a bending die, and manually bend the flanged part to 90° using a hot forming process to form a flanged blank;

[0008] 4) Profiling: Profiling the bent edge blank with a profiling die to make it meet the design dimensions of the cross-flame tube seat;

[0009] 5) Machining: machining the structural features of the bent edge blank to obtain a cross-flame tube seat.

[0010] Furthermore, in the step 2), the bent edge portion is bent outward by 45° to form the preformed blank.

[0011] Further, the preforming mold comprises:

[0012] First template;

[0013] A first concave mold is fixedly arranged on the top surface of the first lower mold plate, a first mold cavity is formed on the top surface of the first concave mold, a avoidance groove is formed on one side of the top of the first mold cavity corresponding to the bent edge portion, and first guide columns are respectively formed on both sides of the first mold cavity on the top surface of the first concave mold;

[0014] A first upper mold plate, arranged above the first concave mold;

[0015] The first punch is fixedly arranged on the bottom surface of the first upper mold plate, a first module is fixedly arranged on the bottom surface of the first punch corresponding to the first mold cavity, a bending block is fixedly arranged on the top of one side of the first module corresponding to the bending part, and is used to extrude the bending part of the cylindrical blank so that it is bent outward by 30°-60°, and a first guide hole is opened on the bottom surface of the first punch corresponding to the first guide column.

[0016] Furthermore, the bending die comprises:

[0017] The second template;

[0018] A second concave mold is fixedly arranged on the top surface of the second lower mold plate, a second mold cavity is formed on the top surface of the second concave mold, a sinking step is formed on the top surface of the second concave mold at one side of the second mold cavity, and a profile groove connected to the second mold cavity is formed on the top surface of the sinking step corresponding to the bent edge portion;

[0019] The second punch is fixed in the second mold cavity by screws, and a pressing edge is arranged on the outer periphery of the top end thereof, and an avoidance step is arranged on one side of the top end thereof corresponding to the molding surface groove.

[0020] Furthermore, the profiling mold comprises:

[0021] A third lower template has through holes formed from the bottom surface to the top surface;

[0022] A third concave die is fixedly arranged on the top surface of the third lower die plate and is located above the through hole. A third die cavity connected to the through hole is provided on the top surface of the third concave die. A profiling groove is provided on one side of the top of the third die cavity corresponding to the bent edge portion. Third guide columns are respectively provided on both sides of the top surface of the third concave die located at the third die cavity.

[0023] A material stripping block is slidably embedded in the through hole along a vertical direction;

[0024] A third upper mold plate, arranged above the third concave mold;

[0025] The third punch is fixedly arranged on the bottom surface of the third upper mold plate, a third module is fixedly arranged on the bottom surface of the third punch corresponding to the third mold cavity, a bending correction block is fixedly arranged on the top of one side of the third module corresponding to the bending part, and a third guide hole is opened on the bottom surface of the third punch corresponding to the third guide column.

[0026] Furthermore, the inner diameter of the through hole is larger than the inner diameter of the third mold cavity, the outer diameter of the material return block is clearance matched with the inner diameter of the third mold cavity, and a circle of limiting steps is provided on the outer periphery of the bottom end of the material return block, the outer diameter of the limiting step is larger than the inner diameter of the third mold cavity, and is clearance matched with the inner diameter of the through hole.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] The forming method of the present invention first opens notches on both sides of the bending part to separate it, so that only the bending part is bent later, and there is no need to fully bend the bottom end of the cylindrical blank; then the excess material at the bottom of the bending part is cut off to reduce the bending height; then the sharp edge of the bending part is rounded; after a series of pre-processing, the risk of cracking of the bending part is greatly reduced when bending; then the bending part is processed and formed by bending twice, further reducing the risk of bending and cracking; then the size of the cross-flame tube seat is guaranteed by calibration; finally, the remaining structural features are machined to obtain the cross-flame tube seat. The forming method of the present application effectively avoids the problem of cracking of the bending part, ensures the forming quality of the cross-flame tube seat, and effectively reduces the production cost.

[0029] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0031] Figure 1 It is a structural schematic diagram of a bending forming method of a cross-fire tube seat;

[0032] Figure 2 It is a structural schematic diagram of the cross-fire tube seat;

[0033] Figure 3 It is a structural schematic diagram of a cylindrical blank;

[0034] Figure 4 It is a schematic diagram of the cross-sectional structure of the preformed blank;

[0035] Figure 5 It is a structural schematic diagram of a preforming mold;

[0036] Figure 6 It is a schematic diagram of the explosion structure of the preforming mold;

[0037] Figure 7 It is a schematic diagram of the cross-sectional structure of the preforming mold;

[0038] Figure 8 It is a structural schematic diagram of the bending die;

[0039] Fig. 9 It is a schematic diagram of the exploded structure of the bending die;

[0040] Fig.10 Schematic diagram of the cross-sectional structure of the bending die;

[0041] Fig.11 It is a structural schematic diagram of the proofreading mold;

[0042] Fig.12 It is a schematic diagram of the cross-sectional structure of the proofreading die;

[0043] Fig.13 Schematic diagram of the explosion structure of the proofreading mold.

[0044] Numbers in the figure: 1, flame tube seat; 2, preforming die; 3, bending die; 4, correction die; 11, bending part; 12, barrel blank; 13, notch; 14, preforming blank;

[0045] 21. first lower mold plate; 22. first concave mold; 23. first upper mold plate; 24. first convex mold; 25. first mold cavity; 26. avoidance groove; 27. first guide column; 28. first module; 29. ​​bending block; 210. first guide hole;

[0046] 31. Second lower mold plate; 32. Second concave mold; 33. Second convex mold; 34. Second mold cavity; 35. Sinking step; 36. Profile groove; 37. Screw; 38. Edge pressing; 39. Avoidance step;

[0047] 41. The third lower template; 42. The third concave mold; 43. The material withdrawal block; 44. The third upper template; 45. The third punch; 46. The through hole; 47. The third mold cavity; 48. The shaping groove; 49. The third guide column; 410. The third module; 411. The bending edge shaping block; 412. The third guide hole; 413. The limiting step. DETAILED DESCRIPTION

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0049] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] Please refer to Figures 1 to 13 The embodiment of the present invention provides a method for bending a cross-fire tube seat, comprising the following steps:

[0051] 1) Pre-processing: milling the cylindrical blank 12, opening a notch 13 on both sides of the curved edge 11; then wire cutting the bottom end of the curved edge 11 to remove the excess material; then pliers the curved edge 11 to round its sharp edge;

[0052] 2) Pre-bending: pre-bending the bending portion 11 of the cylindrical blank 12 by the preforming die 2, so that it is bent outward by 30°-60° to form a preformed blank 14, and the preformed blank 14 is subjected to stress relief heat treatment;

[0053] 3) Bending: the preformed blank 14 is clamped by the bending die 3, and the bending part 11 is manually bent to 90 degrees by a hot forming process to form a bending blank;

[0054] 4) Profiling: Profiling the bent edge blank by a profiling die 4 to meet the design dimensions of the cross-flame tube seat 1;

[0055] 5) Machining: machining the structural features of the bent edge blank to obtain the cross-flame tube seat 1.

[0056] In this embodiment, when the cross-fire tube seat 1 is processed and formed, notches 13 are firstly opened on both sides of the bent edge portion 11 to separate the bent edge portion 11 from the rest of the bottom end of the cylindrical blank 12, so that only the bent edge portion 11 needs to be bent later, and the bottom end of the cylindrical blank 12 does not need to be fully bent, thereby reducing the bending range and effectively reducing the risk of bending cracking;

[0057] Then, the excess material at the bottom of the bent edge 11 is cut off to reduce the height of the bent edge; and the sharp edge of the bent edge 11 is rounded to effectively reduce the risk of bending and cracking;

[0058] Then, the preforming die 2 is used to pre-bend the edge portion 11 of the cylindrical blank 12, and then a stress relief heat treatment is performed to eliminate the stress of the edge portion 11;

[0059] The preformed blank 14 is then clamped by the bending die 3, and then heated to the process temperature, a pad is placed on the bending portion 11, and the pad is hit by a hammer to manually bend the bending portion 11 to 90 degrees to form a bending blank; the bending portion 11 is formed by two bendings, which reduces the risk of bending cracking caused by excessive bending in one time;

[0060] Then, the size of the cross-fire tube seat 1 is ensured by calibration, and the remaining structural features are machined to obtain the cross-fire tube seat. The molding method of the present application effectively avoids the problem of cracking of the bent edge, ensures the molding quality of the cross-fire tube seat, and effectively reduces the production cost.

[0061] In a preferred embodiment, in step 2), the edge portion is bent outward by 45° to form a preformed blank 14, and the bending angle is equally divided into two bends, thereby reducing the risk of bending cracking caused by excessive bending angles in a single bend.

[0062] In a preferred embodiment, if Figure 5 to Figure 7 As shown, the preforming mold 2 includes:

[0063] A first lower template 21;

[0064] The first concave mold 22 is fixedly arranged on the top surface of the first lower mold plate 21. The top surface of the first concave mold 22 is provided with a first mold cavity 25. A side of the top of the first mold cavity 25 is provided with an avoidance groove 26 corresponding to the curved edge portion 11. The top surface of the first concave mold 22 is provided with first guide columns 27 on both sides of the first mold cavity 25.

[0065] A first upper mold plate 23 is disposed above the first concave mold 22;

[0066] The first punch 24 is fixedly arranged on the bottom surface of the first upper mold plate 23. A first module 28 is fixedly arranged on the bottom surface of the first punch 24 corresponding to the first mold cavity 25. A bending block 29 is fixedly arranged on the top of one side of the first module 28 corresponding to the bending part 11, which is used to extrude the bending part 11 of the cylindrical blank 12 so that it is bent outward by 30°-60°. A first guide hole 210 is opened on the bottom surface of the first punch 24 corresponding to the first guide column 27.

[0067] In this embodiment, when the cylindrical blank 12 is pre-bent after pre-processing, the cylindrical blank 12 is turned upside down so that the bend portion 11 faces upward, and is inserted into the first mold cavity 25; then the cylindrical blank 12 is rotated so that the bend portion 11 is aligned with the avoidance groove 26. At this time, the first upper mold plate 23 is slowly pressed down by the hydraulic equipment, and the first punch 24 is pressed down together with it, and the first guide column 27 is first inserted into the corresponding first guide hole 210; under the guiding action, the first module 28 is inserted into the cylindrical blank 12, and then the bend block 29 slowly squeezes the bend portion 11 of the cylindrical blank 12 to bend it outward, and the pre-bending is completed after the mold is closed. The pre-bending molding effect is good, ensuring the molding quality of the cross-fire tube seat 1.

[0068] In a preferred embodiment, if Figure 8 to Figure 10 As shown, the bending die 3 includes:

[0069] The second lower template 31;

[0070] The second die 32 is fixedly arranged on the top surface of the second lower mold plate 31, and a second die cavity 34 is formed on the top surface of the second die 32. A sinking step 35 is formed on the top surface of the second die 32 at one side of the second die cavity 34, and a profile groove 36 connected to the second die cavity 34 is formed on the top surface of the sinking step 35 corresponding to the bent edge portion 11;

[0071] The second punch 33 is fixed in the second mold cavity 34 by screws 37 , and a pressing edge 38 is provided on the outer periphery of the top end thereof, and an avoidance step 39 is provided on one side of the top end thereof corresponding to the profile groove 36 .

[0072] In this embodiment, when the curved edge portion 11 of the preformed blank 14 is bent, it is embedded in the second die cavity 34 so that the curved edge portion 11 is placed above the profile groove 36; then the second punch 33 is inserted into the preformed blank 14 so that the avoidance step 39 faces the curved edge portion 11; then the screw 37 is passed through the connecting through hole on the second punch 33 and is threadedly connected to the threaded hole at the bottom of the second die cavity 34, the screw 37 is tightened, and the edge pressing 38 presses and fixes the top of the preformed blank 14 to complete the clamping;

[0073] At this time, the preformed blank 14 and the bending mold 3 are placed in a heating device for heating. After being heated to the process temperature, a pad is placed on the bending part 11, and the pad is hit with a hammer until the bending part 11 fits on the profile groove 36, and the bending part 11 is manually bent to 90°; the bending forming effect is good, ensuring the forming quality of the cross-flame tube seat 1.

[0074] In a preferred embodiment, if Figure 11 to Figure 13 As shown, the profiling mold 4 includes:

[0075] The third lower template 41 has a through hole 46 formed from the bottom surface to the top surface;

[0076] The third die 42 is fixedly arranged on the top surface of the third lower die plate 41 and is located above the through hole 46. The third die 41 has a third die cavity 47 connected to the through hole 46 on the top surface. A profiling groove 48 is arranged on one side of the top of the third die cavity 47 corresponding to the curved edge portion 11. The third guide columns 49 are respectively arranged on both sides of the third die cavity 47 on the top surface of the third die 42.

[0077] The material stripping block 43 is slidably embedded in the through hole 46 along the vertical direction;

[0078] A third upper mold plate 44 is disposed above the third concave mold 42;

[0079] The third punch 45 is fixedly arranged on the bottom surface of the third upper mold plate 44, and a third module 410 is fixedly arranged on the bottom surface of the third punch 45 corresponding to the third mold cavity 47, a bending correction block 411 is fixedly arranged on the top of one side of the third module 410 corresponding to the bending part 11, and a third guide hole 412 is opened on the bottom surface of the third punch 45 corresponding to the third guide column 49.

[0080] In this embodiment, when the bent blank is calibrated, it is embedded in the third mold cavity 47, and the bent portion 11 is embedded in the calibration groove 48; then the third upper mold plate 44 is slowly pressed down by hydraulic equipment, and the third punch 45 is pressed down together with it, and the third guide column 49 is first inserted into the corresponding third guide hole 412; under the guiding action, the third module 410 is inserted into the bent blank, and cooperates with the third mold cavity 47 to calibrate the main part of the bent blank; the calibration block 411 is pressed on the bent portion 11, and cooperates with the calibration groove 48 to calibrate the bent portion 11 of the bent blank; the calibration is completed after the mold is closed, and the calibration effect is good, ensuring the molding quality of the flame tube seat 1.

[0081] In a preferred embodiment, if Fig.12 As shown, the inner diameter of the through hole 46 is larger than the inner diameter of the third mold cavity 47, the outer diameter of the material return block 43 is clearance matched with the inner diameter of the third mold cavity 47, and a circle of limiting steps 413 is provided on the outer periphery of the bottom end of the material return block 43, the outer diameter of the limiting step 413 is larger than the inner diameter of the third mold cavity 47, and is clearance matched with the inner diameter of the through hole 46.

[0082] In this embodiment, after the bending blank is shaped, the hydraulic device drives the third upper template 44 to lift up, and then pushes up the material stripping block 43, and the material stripping block 43 pushes up the bending blank to complete the automatic material stripping. After the limiting step 413 abuts against the bottom of the third die cavity 47, the material stripping block 43 cannot move up further, and the material stripping is just completed at this time. The structural design is reasonable and the material stripping is convenient.

[0083] In the description of this specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0084] In the description of this specification, the description of the terms "one embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation 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 one or more embodiments or examples in a suitable manner.

[0085] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for bending a cross-fire tube seat, characterized in that: The steps include: 1) Pre-processing, milling the cylindrical blank (12), opening a notch (13) on both sides of the curved edge portion (11); then wire cutting the bottom end of the curved edge portion (11) to remove excess material; then pliers the curved edge portion (11) to round its sharp edge; 2) pre-bending, pre-bending the bending portion (11) of the cylindrical blank (12) by means of a pre-forming die (2) so as to bend the bending portion (11) outward by 30°-60° to form a pre-formed blank (14), and performing stress relieving heat treatment on the pre-formed blank (14); 3) Bending, clamping the preformed blank (14) by a bending die (3), and manually bending the bending portion (11) to 90 degrees by a hot forming process to form a bending blank; 4) Profiling: Profiling the bent edge blank by means of a profiling die (4) so ​​as to meet the design dimensions of the cross-flame tube seat (1); 5) Machining: machining the structural features of the bent edge blank to obtain a cross-fire tube seat (1).

2. The method for bending the cross-fire tube seat according to claim 1, characterized in that: In the step 2), the edge portion (11) is bent outwards by 45° to form the preformed blank (14).

3. The method for bending the cross-fire tube seat according to claim 1, characterized in that: The preforming mold (2) comprises: The first lower template (21); A first concave mold (22) is fixedly arranged on the top surface of the first lower mold plate (21), a first mold cavity (25) is formed on the top surface of the first concave mold (22), a avoidance groove (26) is formed on one side of the top end of the first mold cavity (25) corresponding to the curved edge portion (11), and first guide columns (27) are respectively formed on both sides of the top surface of the first concave mold (22) located at the first mold cavity (25); A first upper mold plate (23) disposed above the first concave mold (25); A first punch (24) is fixedly arranged on the bottom surface of the first upper mold plate (23); a first module (28) is fixedly arranged on the bottom surface of the first punch (24) corresponding to the first mold cavity (25); a bending block (29) is fixedly arranged on the top of one side of the first module (28) corresponding to the bending portion (11), and is used to extrude the bending portion (11) of the cylindrical blank (12) so that it is bent outward by 30°-60°; a first guide hole (210) is opened on the bottom surface of the first punch (24) corresponding to the first guide column (2).

4. The method for bending the cross-fire tube seat according to claim 1, characterized in that: The edge bending die (3) comprises: The second lower template (31); A second concave mold (32) is fixedly arranged on the top surface of the second lower mold plate (31), a second mold cavity (34) is formed on the top surface of the second concave mold (32), a sinking step (35) is formed on the top surface of the second concave mold (32) at one side of the second mold cavity (34), and a molding groove (36) connected to the second mold cavity (34) is formed on the top surface of the sinking step (35) corresponding to the bent edge portion (11); The second punch (33) is fixed in the second mold cavity (34) by means of screws (37), a pressing edge (38) is arranged on the outer periphery of the top end thereof, and an avoidance step (39) is arranged on one side of the top end thereof corresponding to the molding surface groove (36).

5. The method for bending the cross-fire tube seat according to claim 1, characterized in that: The shaping mold (4) comprises: A third lower template (41) has a through hole (46) formed from the bottom surface to the top surface; A third die (42) is fixedly arranged on the top surface of the third lower mold plate (41) and is located above the through hole (46); a third die cavity (47) connected to the through hole (46) is provided on the top surface of the third die cavity (42); a correction groove (48) is provided on one side of the top end of the third die cavity (47) corresponding to the bent edge portion (11); and third guide columns (49) are respectively provided on both sides of the top surface of the third die cavity (47); A material stripping block (43) is slidably embedded in the through hole (46) along a vertical direction; A third upper mold plate (44) is disposed above the third concave mold (42); The third punch (45) is fixedly arranged on the bottom surface of the third upper mold plate (41); a third module (410) is fixedly arranged on the bottom surface of the third punch (45) corresponding to the third mold cavity (47); a bending correction block (411) is fixedly arranged on the top of one side of the third module (410) corresponding to the bending part (11); and a third guide hole (412) is opened on the bottom surface of the third punch (45) corresponding to the third guide column (49).

6. The method for bending the cross-fire tube seat according to claim 5, characterized in that: The inner diameter of the through hole (46) is larger than the inner diameter of the third mold cavity (47), the outer diameter of the material return block (43) is clearance matched with the inner diameter of the third mold cavity (47), and a circle of limiting steps (413) is arranged on the outer periphery of the bottom end of the material return block (43), the outer diameter of the limiting step (413) is larger than the inner diameter of the third mold cavity (47), and is clearance matched with the inner diameter of the through hole (46).

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