Exhaust pipe forming process and forming equipment thereof

Abstract

The invention belongs to the technical field of metal pipe stretching equipment, and provides an exhaust pipe forming technology and forming equipment thereof.The exhaust pipe forming equipment comprises a rack, and a reverse stretching mold part is arranged in the rack and used for conducting reverse stretching forming on an exhaust pipe; the feeding assembly comprises a discharging plate, a baffle mechanism is arranged in the discharging plate, and the baffle mechanism is used for controlling the blank to fall at intervals; and the demolding assembly comprises a baffle arranged in the rack, the baffle is arranged in a sliding mode in the moving direction of the reverse stretching mold part, a through hole is formed in the baffle, and the through hole is used for blocking the exhaust pipe to achieve automatic blanking when the reverse stretching mold part is reset. According to the invention, the exhaust pipe with a complex structure can be integrally formed efficiently and stably.

Description

Technical Field

[0001] This invention belongs to the technical field of metal tube stretching equipment, and particularly relates to an exhaust pipe forming process and its forming equipment. Background Technology

[0002] Existing microwave oven exhaust pipe forming processes generally employ a split-processing method, where different parts of the exhaust pipe are formed separately and then welded together as a whole. This process has significant drawbacks: not only is the production process cumbersome and costly, but the welded structural components also have a large surface roughness, affecting the product's appearance and performance.

[0003] To address these issues, the industry has gradually explored the use of cold heading forming technology to achieve integrated manufacturing of exhaust pipes. However, traditional cold heading technology often faces technical bottlenecks when integrally forming complex irregular structures (such as exhaust pipes with multi-directional tensile characteristics), such as uneven material flow, high forming difficulty, and easy cracking, making it difficult to guarantee the integrity and consistency of parts.

[0004] In recent years, the cold heading biaxial stretching process, especially the one-sided biaxial reverse stretching method, has provided a new technical approach for the integral cold heading of complex irregular structures. This process effectively suppresses crack formation during the forming process by optimizing the material flow path and stress distribution, thereby improving forming accuracy and part quality. Nevertheless, dedicated forming equipment suitable for this process is still relatively scarce. Existing equipment often struggles to balance reverse control of biaxial stretching with forming efficiency, hindering the large-scale application of this process in exhaust pipe manufacturing. Summary of the Invention

[0005] The purpose of this invention is to provide an exhaust pipe forming process and forming equipment to solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention provides the following solution: an exhaust pipe forming apparatus, comprising: A frame, wherein a reverse stretching mold is provided inside the frame, the reverse stretching mold is used to reverse stretch and form the exhaust pipe, and an exhaust mechanism is provided inside the reverse stretching mold. The feeding assembly includes a feeding plate, which is inclined and its bottom end corresponds to the reverse stretching mold component. A baffle mechanism is provided inside the feeding plate to control the interval falling of the blank. The demolding assembly includes a baffle plate disposed within the frame. The baffle plate is slidably disposed along the moving direction of the reverse stretching mold component. A through hole is provided in the baffle plate. The through hole is used to block the exhaust pipe when the reverse stretching mold component is reset, so that the exhaust pipe falls into the material discharge groove within the frame.

[0007] Preferably, the baffle mechanism includes two sets of first baffles and two sets of second baffles rotatably connected to the feed plate. The two second baffles are disposed below the two first baffles. A transmission member is provided between the first baffles, the second baffles and the feed plate. The transmission member is used to control the tops of the two second baffles to move closer to each other synchronously when the bottoms of the two first baffles move closer, or the tops of the two second baffles to move further apart synchronously when the bottoms of the two first baffles move further apart.

[0008] Preferably, the end of the feeding plate away from the frame is connected to a feeding hopper, the feeding hopper is used to store raw materials, and a vibrator is fixedly connected to the side wall of the feeding hopper.

[0009] Preferably, a moving drive component is provided between the upper die in the reverse stretching die component and the frame. The moving drive component includes a connecting block slidably connected in the frame. A connecting rod is fixedly connected to the side wall of the connecting block along the sliding direction of the connecting block. A rotating wheel is rotatably connected in the frame. The rotating shaft of the rotating wheel is horizontally arranged. A drive motor is transmitted between the rotating wheel and the frame. One end of a swing arm is hinged to the edge of the rotating wheel. The other end of the swing arm is hinged to the end of the connecting rod away from the connecting block. A sliding block is fixedly connected to the top of the connecting block. Punch bars are fixedly connected to the sliding block.

[0010] Preferably, the reverse stretching die includes a lower reverse stretching die fixedly connected to the frame and a punch fixedly connected to the end of the sliding block. The lower reverse stretching die has a die cavity opened inward on the side near the sliding block. The end of the die cavity near the punch is connected to a second cavity. The punch is correspondingly arranged with the inner side of the die cavity. A stamping ring is also fixedly connected to the end of the sliding block. The stamping ring is arranged on the outer side of the punch and coaxially with the punch. The stamping ring is correspondingly arranged with the inner side of the second cavity.

[0011] Preferably, a slide rail is fixedly connected between the baffle and the frame, and a slider is slidably connected on the slide rail along the sliding direction of the sliding block. The baffle is fixedly connected to the slider, and a spring is fixedly connected between the slider and the slide rail. The spring is used to pull the slider away from the reverse stretching lower die, and the punch extends through the through hole into the mold cavity.

[0012] Preferably, the venting mechanism includes a plurality of air holes, which are opened at the bottom of the second cavity, and the air holes are used to discharge the gas in the reverse stretching die during the extrusion process.

[0013] Preferably, the bottom of the second cavity is connected to the bottom of the mold cavity by an arc-shaped ligament.

[0014] An exhaust pipe forming process, comprising the following steps: The blank is fed into the reverse stretching die through the blanking plate for reverse stretching and extrusion. After reverse stretching and extrusion molding, the exhaust pipe is automatically dropped from the reverse stretching die part by the baffle and falls into the material discharge groove.

[0015] Compared with existing technologies, this invention has the following advantages and technical effects: The main function of the reverse stretching die is to stretch the blank to form an exhaust pipe structure; the main function of the baffle mechanism is to control the timing of the blank's descent, allowing it to fall in an orderly and spaced manner, thereby controlling the feed rate; the main function of the through hole is to allow the upper die punch in the reverse stretching die to pass through and insert into the lower die, preventing the baffle from affecting the stretching process; the main function of the baffle is to address the problem of increased friction and difficulty in demolding caused by the punch completely adhering to the die after reverse stretching, by blocking the exhaust pipe during the punch's reset process, allowing the exhaust pipe to automatically detach from the punch, thus achieving automatic material discharge. Overall, this invention, through reverse stretching of the blank, can efficiently and stably achieve the integrated molding of complex exhaust pipe structures, overcoming the problems of high cost, cumbersome processes, poor surface quality, and easy cracking in existing technologies. Simultaneously, the baffle mechanism enables orderly and spaced material discharge, and the baffle achieves automatic material discharge of the exhaust pipe, improving production efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the molding equipment of the present invention; Figure 2 for Figure 1 Enlarged view of part A in the image; Figure 3 This is a schematic diagram of the moving drive component of the present invention; Figure 4 This is a schematic diagram of the anti-stretching mold component of the present invention; Figure 5 This is a schematic diagram of the baffle mechanism of the present invention; The components are as follows: 1. Frame; 4. Sliding block; 5. Punch bar; 6. Opening; 7. Baffle; 8. Through hole; 9. Slider; 10. Spring; 11. Slide rail; 12. Connecting block; 13. Connecting rod; 14. Swing rod; 15. Rotary wheel; 16. Drop chute; 61. Air hole; 62. Arc-shaped ligament; 63. Reverse stretching lower die; 64. Second cavity; 65. Die cavity; 66. Stamping ring; 19. Feed hopper; 20. Discharge plate; 21. First baffle; 22. Second baffle; 23. Vibrator. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Reference Figures 1-5 The present invention provides an exhaust pipe forming device, comprising: The frame 1 is equipped with a reverse stretching mold component, which is used to reverse stretch and form the exhaust pipe. The reverse stretching mold component is equipped with an exhaust mechanism. The feeding assembly includes a feeding plate 20, which is inclined and has its bottom end corresponding to the anti-stretching mold. A baffle mechanism is provided inside the feeding plate 20 to control the interval falling of the blank. The demolding assembly includes a baffle 7 disposed within the frame 1. The baffle 7 is slidably disposed along the moving direction of the reverse stretching mold component. A through hole 8 is provided in the baffle 7. The through hole 8 is used to block the exhaust pipe when the reverse stretching mold component is reset, so that the exhaust pipe falls into the material drop trough 16 within the frame 1.

[0021] The main function of the reverse stretching die is to stretch the blank, forming an exhaust pipe structure. The main function of the baffle mechanism is to control the timing of the blank's descent, ensuring orderly and spaced descent to control the feed rate. The main function of the through hole 8 is to allow the upper die punch in the reverse stretching die to pass through and insert into the lower die, preventing the baffle 7 from affecting the stretching process. The main function of the baffle 7 is to address the problem of increased friction and difficulty in demolding caused by the punch completely adhering to the die after reverse stretching. During the punch resetting process, the baffle blocks the exhaust pipe, allowing it to automatically detach from the punch and achieve automatic unloading. Overall, this invention achieves efficient and stable one-piece molding of the complex exhaust pipe structure by reverse stretching the blank, overcoming the problems of high cost, cumbersome process, poor surface quality, and easy cracking in existing technologies. Simultaneously, the baffle mechanism enables orderly and spaced feeding, and the baffle facilitates automatic unloading of the exhaust pipe, improving production efficiency.

[0022] The scheme is further optimized. The baffle mechanism includes two sets of first baffles 21 and two sets of second baffles 22 rotatably connected to the feed plate 20. The two second baffles 22 are located below the two first baffles 21. A transmission component is provided between the first baffles 21, the second baffles 22 and the feed plate 20. The transmission component is used to control the tops of the two second baffles 22 to move closer to each other synchronously when the bottoms of the two first baffles 21 are close together, or the tops of the two second baffles 22 to move further away from each other synchronously when the bottoms of the two first baffles 21 are far apart.

[0023] like Figure 5 As shown, when the tops of the first baffles 21 approach each other, the bottoms of the second baffles 22 approach each other. At this time, a blank is enclosed between the two sets of first baffles 21 and the two sets of second baffles 22, while the blank above the feed plate 20 is blocked by the two sets of first baffles 21. Then, driven by the transmission component, the first baffles 21 and the second baffles 22 rotate relative to each other, causing the blank between the first baffles 21 and the second baffles 22 to fall between the two second baffles 22. Simultaneously, another blank on the feed plate 20 enters between the two sets of first baffles 21. Then, driven by the transmission component, the first baffles 21 and the second baffles 22 reset and deflect, placing the blank between the first baffles 21 and the second baffles 22. Driven by the transmission component, the first baffles 21 and the second baffles 22 repeat the above reciprocating deflection, achieving the intermittent feeding of blanks.

[0024] The transmission component consists of a motor and connecting rods, enabling the linkage of the two sets of first baffles 21 and second baffles 22. Alternatively, four motors can drive the two sets of first baffles 21 and second baffles 22 to rotate respectively. The specific structure of the transmission component will not be described in detail here.

[0025] In a further optimized design, the end of the feed plate 20 away from the frame 1 is connected to a feed hopper 19, which is used to store raw materials. A vibrator 23 is fixedly connected to the side wall of the feed hopper 19.

[0026] like Figure 5 As shown, the main function of the vibrator 23 is to make the blank in the feed hopper 19 fall smoothly onto the feed plate 20.

[0027] Further optimizing the design, a moving drive component is installed between the upper die and the frame 1 within the reverse stretching die component. This moving drive component includes a connecting block 12 slidably connected within the frame 1. A connecting rod 13 is fixedly connected to the side wall of the connecting block 12 along its sliding direction. A rotating wheel 15 is rotatably connected within the frame 1, with its shaft horizontally positioned. A drive motor is connected between the rotating wheel 15 and the frame 1. One end of a swing rod 14 is hinged to the edge of the rotating wheel 15, and the other end of the swing rod 14 is hinged to the end of the connecting rod 13 furthest from the connecting block 12. A sliding block 4 is fixedly connected to the top of the connecting block 12, and punches 5 are fixedly connected to the sliding block 4.

[0028] like Figure 3 As shown, during operation, the drive motor drives the rotating wheel 15 to rotate, which causes the swing arm 14 to drive the connecting rod 13 to move back and forth in the horizontal direction. This, in turn, drives the connecting block 12 to move several sliding blocks 4 back and forth, thereby realizing the reciprocating movement of the punch 5 relative to the lower die in the first stretching die, the second stretching die, several shaping die and reverse stretching die, and thus stretching and extruding the tube.

[0029] Further optimization of the scheme: the reverse stretching die component includes a reverse stretching lower die 63 fixedly connected in the frame 1 and a punch 5 fixedly connected to the end of the sliding block 4. The reverse stretching lower die 63 has a die cavity 65 opened inward on the side near the sliding block 4. The end of the die cavity 65 near the punch 5 is connected to a second cavity 64. The punch 5 is correspondingly arranged inside the die cavity 65. The end of the sliding block 4 is also fixedly connected to a stamping ring 66. The stamping ring 66 is arranged outside the punch 5 and coaxially with the punch 5. The stamping ring 66 is correspondingly arranged inside the second cavity 64.

[0030] like Figure 5 As shown, after the blank is placed in the second cavity 64, the punch 5 squeezes the blank and moves it into the mold cavity 65, and performs reverse stretching and extrusion on the exhaust pipe. Finally, the exhaust pipe is formed and fitted onto the punch 5.

[0031] In a further optimized design, a slide rail 11 is fixedly connected between the baffle 7 and the frame 1. A slider 9 is slidably connected to the slide rail 11 along the sliding direction of the sliding block 4. The baffle 7 is fixedly connected to the slider 9. A spring 10 is fixedly connected between the slider 9 and the slide rail 11. The spring 10 is used to pull the slider 9 away from the reverse stretching lower die 63. The punch 5 extends into the mold cavity 65 through the through hole 8.

[0032] like Figure 2As shown, during the reverse stretching and extrusion, the punch 5 penetrates the through hole 8 and enters the mold cavity 65. After processing, as the sliding block 4 moves backward, the baffle 7, due to its contact with the sliding block 4, moves backward synchronously along the slide rail 11 under the tension of the spring 10. After moving to the rear end of the slide rail 11, the baffle 7 stops moving, and the punch 5 continues to move backward with the sliding block 4. Since the exhaust pipe on the punch 5 abuts against the side wall of the baffle 7, the exhaust pipe automatically detaches from the punch 5 and automatically falls into the material drop trough 16, completing the processing of the exhaust pipe.

[0033] Further optimization of the scheme: the exhaust mechanism includes several air holes 61, which are opened at the bottom of the second cavity 64. The air holes 61 are used to discharge the gas in the reverse stretching lower die 63 during the extrusion process.

[0034] like Figure 4 As shown, in this embodiment, a total of 6 sets of air holes 61 are provided to release the pressure in the reverse stretching die 63 during the extrusion molding process, which can effectively avoid the problem of product cracking and explosion, and improve the surface smoothness of the product.

[0035] In a further optimized design, the bottom of the second cavity 64 is connected to the bottom of the mold cavity 65 by an arc-shaped ligament 62.

[0036] In a further optimized embodiment, the radius of the arcuate ligament 62 is 0.2mm to 0.3mm.

[0037] An exhaust pipe forming process, comprising the following steps: The blank is fed into the reverse stretching die through the blanking plate 20 for reverse stretching and extrusion; after the blank falls into the second cavity 64, the punch 5 is inserted into the die cavity 65 to realize the reverse stretching processing of the exhaust pipe.

[0038] After reverse stretching and extrusion molding, the exhaust pipe is automatically dropped from the reverse stretching die part by the baffle 7 and falls into the material discharge groove 16.

[0039] After processing, the exhaust pipe moves backward with the punch 5. When the exhaust pipe comes into contact with the baffle 7, it is blocked by the baffle 7, and the exhaust pipe falls off the punch 5 and automatically falls into the material chute 16.

[0040] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0041] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An exhaust pipe forming device, characterized in that, include: A frame (1) is provided with a reverse stretching mold component, which is used to reverse stretch and form the exhaust pipe, and an exhaust mechanism is provided in the reverse stretching mold component. The feeding assembly includes a feeding plate (20), which is inclined and has its bottom end corresponding to the reverse stretching mold. A baffle mechanism is provided inside the feeding plate (20) to control the interval drop of the blank. The demolding assembly includes a baffle (7) disposed in the frame (1). The baffle (7) is slidably disposed along the moving direction of the reverse stretching mold. A through hole (8) is provided in the baffle (7). The through hole (8) is used to block the exhaust pipe when the reverse stretching mold is reset, so that the exhaust pipe falls into the material drop groove (16) in the frame (1).

2. The exhaust pipe forming equipment according to claim 1, characterized in that: The baffle mechanism includes two sets of first baffles (21) and two sets of second baffles (22) rotatably connected to the feed plate (20). The two second baffles (22) are disposed below the two first baffles (21). A transmission component is provided between the first baffles (21), the second baffles (22) and the feed plate (20). The transmission component is used to control the tops of the two second baffles (22) to move closer to each other synchronously when the bottoms of the two first baffles (21) are close together, or the tops of the two second baffles (22) to move further away from each other synchronously when the bottoms of the two first baffles (21) are far apart.

3. The exhaust pipe forming equipment according to claim 1, characterized in that: The end of the feed plate (20) away from the frame (1) is connected to the feed hopper (19), which is used to store the blank material. A vibrator (23) is fixedly connected to the side wall of the feed hopper (19).

4. The exhaust pipe forming equipment according to claim 1, characterized in that: A moving drive component is provided between the upper mold in the anti-stretching mold component and the frame (1). The moving drive component includes a connecting block (12) slidably connected in the frame (1). A connecting rod (13) is fixedly connected to the side wall of the connecting block (12) along the sliding direction of the connecting block (12). A rotating wheel (15) is rotatably connected in the frame (1). The rotating shaft of the rotating wheel (15) is horizontally set. A drive motor is connected between the rotating wheel (15) and the frame (1). One end of a swing rod (14) is hinged to the side of the rotating wheel (15). The other end of the swing rod (14) is hinged to the end of the connecting rod (13) away from the connecting block (12). A sliding block (4) is fixedly connected to the top of the connecting block (12). Punch bars (5) are fixedly connected to the sliding block (4).

5. The exhaust pipe forming equipment according to claim 4, characterized in that: The reverse stretching die includes a reverse stretching lower die (63) fixedly connected to the frame (1) and a punch (5) fixedly connected to the end of the sliding block (4). The reverse stretching lower die (63) has a die cavity (65) opened inward on the side near the sliding block (4). The end of the die cavity (65) near the punch (5) is connected to a second cavity (64). The punch (5) is correspondingly arranged inside the die cavity (65). A stamping ring (66) is also fixedly connected to the end of the sliding block (4). The stamping ring (66) is arranged outside the punch (5) and coaxially with the punch (5). The stamping ring (66) is correspondingly arranged inside the second cavity (64).

6. The exhaust pipe forming equipment according to claim 5, characterized in that: A slide rail (11) is fixedly connected between the baffle (7) and the frame (1). A slider (9) is slidably connected on the slide rail (11) along the sliding direction of the sliding block (4). The baffle (7) is fixedly connected to the slider (9). A spring (10) is fixedly connected between the slider (9) and the slide rail (11). The spring (10) is used to pull the slider (9) away from the reverse stretching lower die (63). The punch (5) extends into the mold cavity (65) through the through hole (8).

7. The exhaust pipe forming equipment according to claim 5, characterized in that: The exhaust mechanism includes a plurality of air holes (61), which are located at the bottom of the second cavity (64). The air holes (61) are used to discharge the gas in the reverse stretching die (63) during the extrusion process.

8. The exhaust pipe forming equipment according to claim 7, characterized in that: The bottom of the second cavity (64) is connected to the bottom of the mold cavity (65) by an arc-shaped ligament (62).

9. An exhaust pipe forming process, based on the exhaust pipe forming equipment according to claim 1, characterized in that, The operating steps include: The blank is fed into the reverse stretching die through the blanking plate (20) for reverse stretching extrusion; After reverse stretching and extrusion molding, the exhaust pipe is automatically dropped from the reverse stretching mold part and into the material drop groove (16) by the baffle (7).

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