Multi-station progressive forming device and forming method for torch port at end part of automobile differential pressure pipe

Abstract

The invention relates to the technical field of automobile part machining, in particular to a multi-station progressive forming device and method for a torch opening in the end of an automobile differential pressure pipe, and the multi-station progressive forming device comprises a clamping die assembly, a core die assembly and an auxiliary assembly; the core mold assembly comprises a first core mold part, a second core mold part and a third core mold part; the first core die part is used for conducting flaring stamping on the automobile differential pressure pipe, the second core die part is used for conducting arc-shaped stamping on the automobile differential pressure pipe obtained after flaring stamping, and the third core die part is used for conducting inward flanging stamping on the automobile differential pressure pipe obtained after arc-shaped stamping. Through the adjustable structure that the upper clamping die part and the lower clamping die part are combined with the auxiliary assembly, pipes with different diameters can be flexibly clamped, and the limitation of a traditional single die is avoided. The first core mold part, the second core mold part and the third core mold part are formed step by step instead of one-time stamping, a three-stage progressive forming process, flaring, arc-shaped stamping and torch opening shaping are adopted, size deviation caused by material stress concentration is avoided, and the formed contour is more accurate.

Description

Technical Field

[0001] This invention relates to the field of automotive parts processing technology, specifically to a multi-station progressive forming device and method for the end flare port of an automotive differential pressure pipe. Background Technology

[0002] The differential pressure line is used to manage the operating mode of the particulate filter. Its working principle is as follows: A particulate filter is installed in the exhaust system. Its intake and exhaust ends are connected to a differential pressure sensor via a differential pressure line. The differential pressure sensor detects the exhaust pressure in the line through the differential pressure line and feeds this information back to the engine control system to determine whether the particulate filter needs regeneration. When the particulate matter in the particulate filter increases and the pressure difference between the inlet and outlet reaches a certain threshold, the control system initiates the regeneration program to remove the particulate matter, ensuring the particulate filter maintains good operating condition. In the fuel system, the differential pressure line measures the pressure difference between the fuel pump output and the engine fuel injection system input, ensuring that fuel is supplied to the engine at an appropriate pressure, guaranteeing normal fuel injection and combustion, thereby reducing fuel consumption.

[0003] The ends of automotive differential pressure hoses often need to be machined into a torch shape (conical flare or irregular curved surface) to accommodate sealing connections or gas flow requirements. Traditional automotive differential pressure hose end forming processes present a series of problems. Previous processing methods often struggled to guarantee precision when forming torch-shaped ends of differential pressure hoses, and were difficult to adapt to automotive differential pressure hoses of different diameters. Summary of the Invention

[0004] (a) Purpose of the invention The purpose of this invention is to provide a multi-station progressive forming device and method for automotive differential pressure pipe end flare ports that can be adapted to different pipe diameters and improve processing accuracy.

[0005] (II) Technical Solution To address the aforementioned problems, this invention provides a multi-station progressive forming device for the end torch port of an automotive differential pressure pipe, comprising: a clamping mold assembly, a core mold assembly, and auxiliary components; The clamping assembly includes an upper clamping component and a lower clamping component, which clamp the automotive differential pressure pipe to be processed through the auxiliary component; The core mold assembly includes a first core mold component, a second core mold component, and a third core mold component; The first core mold component, the second core mold component, and the third core mold component sequentially stamp the automotive differential pressure pipe through the auxiliary components; The first mandrel component is used to flare and stamp the automotive differential pressure pipe, the second mandrel component is used to flare and stamp the automotive differential pressure pipe into an arc shape, and the third mandrel component is used to flare and stamp the automotive differential pressure pipe into an inner flange shape, so that the end of the automotive differential pressure pipe forms a torch-shaped nozzle.

[0006] In another aspect of the present invention, preferably, the first core mold component includes a first cone head, the first cone head includes a first cone portion, a connecting portion and a second cone portion, the first cone portion and the second cone portion are connected by the connecting portion, the minimum diameter of the second cone portion is greater than or equal to the maximum diameter of the first cone portion, when the flaring cone head performs flaring stamping on the automotive differential pressure pipe, the first cone portion, the connecting portion and the second cone portion sequentially enter the automotive differential pressure pipe, the first cone portion is used for guidance, and the second cone portion is used for flaring the front end of the automotive differential pressure pipe.

[0007] In another aspect of the present invention, preferably, the second core mold component includes a second cone head, the second cone head includes a third cone portion and an arc-shaped baffle, the arc-shaped baffle is disposed at the end of the third cone portion with a larger diameter, the end face of the arc-shaped baffle connected to the third cone portion has an arc-shaped concave structure, when the second cone head performs arc-shaped stamping on the automotive differential pressure pipe, the third cone portion enters the flared automotive differential pressure pipe, and the arc-shaped baffle stamps the front end of the automotive differential pressure pipe into the arc shape of the arc-shaped baffle.

[0008] In another aspect of the present invention, preferably, the third core mold component includes a third cone head, the third cone head includes a fourth cone portion, the fourth cone portion enters the automobile differential pressure tube after arc-shaped stamping, and stamps the front end portion of the automobile differential pressure tube into the automobile differential pressure tube to form a torch-shaped nozzle.

[0009] In another aspect of the present invention, preferably, the first core mold component further includes a first core and a first limiting member. The first core is provided with a first channel, which includes a larger diameter portion and a smaller diameter portion. A first nail head is provided at the end of the first cone away from the first cone. The diameter of the first nail head is larger than the largest diameter portion of the second cone and larger than the diameter of the smaller diameter portion of the first channel. One end of the first nail head is engaged with the outside of the smaller diameter portion, and the first limiting member abuts against the other end of the first nail head in the larger diameter portion, and the first limiting member is locked with the first core.

[0010] In another aspect of the present invention, preferably, the first core mold component further includes a first base and a first locking member, the first core is disposed at one end inside the first base, and the first base is locked to the first core by the first locking member; The first locking component includes a first screw and a first nut, the threads of the first screw and the first nut are adapted to each other, the first nut is connected to the outer wall of the first base, the first base is provided with a first through hole along the axial direction of the first nut, and the first screw is locked to the first core by abutting against the first nut and the first through hole.

[0011] In another aspect of the present invention, preferably, the first core is provided with a pair of first grooves, the bottom of the first grooves is inclined, and the first screw is locked to the bottom of the first grooves by the first nut and the first through hole.

[0012] In another aspect of the present invention, preferably, the second core mold component further includes a second core portion, and one end of the arc-shaped baffle away from the third cone portion is connected to the second core portion, wherein the second core portion and the arc-shaped baffle are integrally formed.

[0013] In another aspect of the present invention, preferably, the third core mold component further includes a third core portion, and the third cone head further includes a transition portion. The third cone head is connected to the third core portion through the transition portion. The outer diameter of the transition portion is smaller than the outer diameter of the third core portion, and the outer diameter of the transition portion is equal to the maximum diameter of the fourth cone portion.

[0014] In another aspect, preferably, a forming method for a multi-station progressive forming apparatus for an automotive differential pressure pipe end flare port is provided. The forming method is applicable to the multi-station progressive forming apparatus for an automotive differential pressure pipe end flare port as described above. The forming method includes: The automotive differential pressure pipe to be processed is clamped using the upper clamping mold component and the lower clamping mold component; Move the core mold assembly to align the position of the first core mold component with the automotive differential pressure pipe. After alignment, use the first core mold component to flare and punch the automotive differential pressure pipe. Move the core mold assembly to align the position of the second core mold component with the automotive differential pressure pipe, and use the second core mold component to perform arc stamping on the flared and stamped automotive differential pressure pipe. Move the core mold assembly to align the position of the third core mold component with the automotive differential pressure pipe, and use the third core mold component to perform inward flanging stamping on the arc-shaped stamped automotive differential pressure pipe.

[0015] (III) Beneficial Effects The above-described technical solution of the present invention has the following beneficial technical effects: This invention utilizes a modular design and multi-stage step-by-step stamping process. The upper and lower clamping die components are designed as separate units, and the adjustable structure of the upper and lower clamping die components, combined with auxiliary components, allows for flexible clamping of pipes of different diameters, avoiding the limitations of traditional single-die systems. The first, second, and third core die components are formed gradually rather than in a single stamping process, reducing the pipe's deformation resistance and decreasing sensitivity to die dimensions, thus enabling compatibility with a wider range of pipe diameters. The three-stage progressive forming process—flaring, arc stamping, and torch nozzle shaping—decomposes complex shapes into ordered steps, with each step addressing only specific deformation areas, avoiding dimensional deviations caused by material stress concentration, resulting in more precise forming contours. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the clamping mold assembly and core mold assembly according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of the clamping mold assembly and the first core mold component according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the first cone head structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the first cone head stamping state according to an embodiment of the present invention; Figure 5 This is a cross-sectional view of the structure of the second core mold component according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the second cone head structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the second cone head stamping state according to an embodiment of the present invention; Figure 8 This is a cross-sectional view of the third core mold component structure according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the third cone head structure according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the third cone head stamping state according to an embodiment of the present invention; Figure label: 1: Clamping assembly; 110: Upper clamping component; 120: Lower clamping component. 2: Core mold assembly; 210: First core mold component; 211: First cone head; 212: First cone portion; 213: Connecting portion; 214: Second cone portion; 215: First core portion; 2151: First groove; 216: First limiting member; 217: First nail head; 218: First base; 219: First locking member; 2191: First screw; 2192: First nut. 220: Second core mold component; 221: Second cone head; 222: Third cone section; 223: Arc-shaped baffle; 224: Second core section. 230: Third core mold component; 231: Third cone head; 232: Fourth cone part; 233: Third core part; 234: Transition part. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0018] The accompanying drawings show structural schematic diagrams according to embodiments of the present invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0019] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] The invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0023] Example 1 A multi-station progressive forming device for the end flare port of an automotive differential pressure pipe. Figure 1 A schematic diagram of the clamping mold assembly and core mold assembly according to an embodiment of the present invention is shown, as follows: Figure 1 As shown, it includes: a clamping mold assembly 1, a core mold assembly 2, and auxiliary components; the specific content of the auxiliary components is not limited here. In this embodiment, the auxiliary components include at least a clamping mold driving component, a core mold stamping driving component, a core mold moving component, a core mold moving driving component, and a support frame; The clamping mold assembly 1 includes an upper clamping mold component 110 and a lower clamping mold component 120. The upper clamping mold component 110 and the lower clamping mold component 120 clamp the automotive differential pressure pipe to be processed through the auxiliary component. In this embodiment, the clamping mold driving component is hydraulically driven. By driving the upper clamping mold component 110 to move downward and cooperate with the lower clamping mold component 120 to clamp the automotive differential pressure pipe to be processed, during demolding, the upper clamping mold component 110 contracts radially through hydraulic drive to avoid the finished product getting stuck. The inner cavity of the upper clamping mold component 110 is designed as a stepped compression surface, which, together with the arc-shaped support platform of the lower clamping mold component 120, forms a progressive material flow path and reduces stress concentration. Furthermore, in this embodiment, the upper clamping mold component 110 includes an upper inner mold and an upper outer mold, and the lower clamping mold component 120 includes a lower inner mold and a lower outer mold. By setting the upper inner mold and the lower inner mold in a shape that is compatible with the automotive differential pressure pipe to be processed, and then clamping the upper inner mold and the lower inner mold by the upper outer mold and the lower outer mold, when the diameter or shape of the automotive differential pressure pipe needs to be changed, only the upper inner mold and the lower inner mold need to be replaced, without replacing the entire clamping mold assembly 1, thus achieving higher adaptability.

[0024] The core mold assembly 2 includes a first core mold component 210, a second core mold component 220, and a third core mold component 230; The first core mold component 210, the second core mold component 220 and the third core mold component 230 sequentially stamp the automotive differential pressure pipe through the auxiliary components; The first mandrel component 210 is used to flare and stamp the automotive differential pressure pipe, and the second mandrel component 220 is used to flare and stamp the automotive differential pressure pipe into an arc shape. The second mandrel component 220 is used to flare and stamp the automotive differential pressure pipe into an inner flange shape so that the end of the automotive differential pressure pipe forms a torch-shaped nozzle.

[0025] Figure 2 A cross-sectional view of the clamping mold assembly and the first core mold component according to an embodiment of the present invention is shown, as follows: Figure 2 As shown, Figure 3 A schematic diagram of a first cone head structure according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of the first cone head stamping state according to an embodiment of the present invention is shown; as follows: Figure 2 , Figure 3 and Figure 4As shown, in this embodiment, the first core mold component 210 includes a first cone 211, responsible for flaring the pipe end. The first cone 211 includes a first cone portion 212, a connecting portion 213, and a second cone portion 214. The first cone portion 212 and the second cone portion 214 are connected by the connecting portion 213. The minimum diameter of the second cone portion 214 is greater than or equal to the maximum diameter of the first cone portion 212. When the first cone 211 flares and punches the automotive differential pressure pipe, the first cone portion 212, the connecting portion 213, and the second cone portion 214 sequentially enter the automotive differential pressure pipe. The first cone portion 212 is used for guidance to ensure that the cone smoothly enters the pipe end and avoids deflection. The diameter of the first cone portion 212 is non-linear from the smallest to the largest, and its shape is a small-angle cone, such as 15°~30°. In the initial alignment, the diameter of the front end of the first cone 212 is almost equal to the inner diameter of the automotive differential pressure pipe, and the diameter of the rear end of the first cone 212 is greater than the inner diameter of the automotive differential pressure pipe. The connecting part 213 connects the first cone 212 and the second cone 214. It can be cylindrical or slightly tapered to ensure a smooth transition. In this embodiment, the connecting part 213 is cylindrical, and the diameter of the connecting part 213 is equal to the maximum diameter of the first cone 212. Through the transition of the connecting part 213, stress concentration is avoided, which leads to pipe wall cracking. The second cone 214 is used to flare the front end of the automotive differential pressure pipe. The diameter of the second cone 214 is non-linear from the smallest to the largest diameter. The second cone 214 enters the pipe end, forcing the material to expand radially and forming a preliminary flare. The cone angle of the second cone is determined according to the flare angle and the uniformity of material flow.

[0026] Furthermore, in this embodiment, the first core mold component 210 further includes a first core portion 215 and a first limiting member 216. The first core portion 215 supports the first cone head and achieves locking and fixation. The first limiting member 216 restricts the axial movement of the cone head. The first core portion 215 has a first channel inside, which includes a larger diameter portion and a smaller diameter portion. The end of the first cone head 211 away from the first cone portion 212 is provided with a first nail head 217. The diameter of the first nail head 217 is larger than the largest diameter portion of the second cone portion 214 and larger than the diameter of the smaller diameter portion of the first channel. One end of the first nail head 217 is engaged with the outside of the smaller diameter portion. The larger diameter portion accommodates the first nail head 217. Parts or all of the first cone portion 212, the connecting portion 213, and the second cone portion 214 pass through the first channel and are located outside the first core portion 215. The smaller diameter portion restricts the axial displacement of the first cone head 211 by restricting the first nail head 217. This restricted axial displacement is a forward displacement. The first limiting member 216 abuts against the other end of the larger diameter portion of the first nail head 217. The first limiting member 216 is locked to the first core 215. The axial displacement restricted by the first limiting member 216 is a backward displacement. Furthermore, the first limiting member 216 can be a cylinder, threadedly connected to the channel of the first core 215, directly screwed to press against the first nail head 217. Alternatively, it can be a cylinder with a snap-fit ​​component adapted to the channel of the first core 215. Further, a limiting groove is provided at the end of the first channel of the first core 215 near the first cone portion 212. The limiting groove communicates with the first channel, and its diameter is larger than the diameter of the smaller portion of the first channel. This provides space to accommodate the automotive differential pressure pipe during flaring and also limits the maximum diameter of the automotive differential pressure pipe during flaring.

[0027] Furthermore, the first core mold component 210 also includes a first base 218 and a first locking member 219. The first core portion 215 is disposed at one end inside the first base 218, and the first base 218 is locked to the first core portion 215 by the first locking member 219. The first locking member 219 includes a first screw 2191 and a first nut 2192, the threads of the first screw 2191 and the first nut 2192 are adapted to each other, the first nut 2192 is connected to the outer wall of the first base 218, and the first base 218 is provided with a first through hole along the axial direction of the first nut 2192, the axial through hole being connected to the nut axis. In the thread pair, the first screw 2191 abuts and locks against the first core 215 through the first nut 2192 and the first through hole, ensuring that the first core 215 does not shift or loosen during the stamping process. The threaded engagement allows for convenient replacement of the first core 215. The first base 218 has a stepped cavity inside, with the front end accommodating the first core 215. The first core 215 has a pair of first grooves 2151, the bottom of which is inclined. The first screw 2191 abuts and locks against the bottom of the first grooves 2151 through the first nut 2192 and the first through hole. The bottom of the first groove 2151 is perpendicular to the axial direction of the first through hole and the first nut 2192.

[0028] Figure 5 A cross-sectional view of the structure of a second core mold component according to an embodiment of the present invention is shown; Figure 6 A schematic diagram of the second cone head structure according to an embodiment of the present invention is shown; Figure 7 A schematic diagram of the second cone head stamping state according to an embodiment of the present invention is shown; as follows: Figure 5 , Figure 6 and Figure 7As shown, further in this embodiment, the second mandrel component 220 includes a second cone head 221, which includes a third cone portion 222 and an arc-shaped baffle 223. The arc-shaped baffle 223 is disposed at the end of the third cone portion 222 with a larger diameter. The end face of the arc-shaped baffle 223 connected to the third cone portion 222 has an arc-shaped concave structure. When the second cone head 221 performs arc-shaped stamping on the automotive differential pressure pipe, the third cone portion 222 enters the flared automotive differential pressure pipe. The third cone portion 222 ensures the inner diameter of the automotive differential pressure pipe during mutual stamping. The arc-shaped baffle 223 stamps the front end of the automotive differential pressure pipe into the arc shape of the arc-shaped baffle 223. The second mandrel component 220 also includes a second core portion 224. The end of the arc-shaped baffle 223 away from the third cone portion 222 is connected to the second core portion 224. The second core portion 224 and the arc-shaped baffle 223 are integrally formed. The axial forward and backward limiting structure of the second cone 221 within the second core 224 is the same as the limiting structure of the first cone 211 within the first core. The second core mold component 220 also includes a second base and a second locking member, the second base and the second locking member having the same structure as the first base and the first locking member.

[0029] The second core 224 is disposed at one end inside the second base. The second base is locked to the second core 224 by a second locking member. The second locking member includes a second screw and a second nut, the threads of which are adapted to each other. The second nut is connected to the outer wall of the second base. The second base is provided with a second through hole along the axial direction of the second nut, the axial direction of which is aligned with the axis of the second nut. The second screw abuts against the second core through the second nut and the second through hole to lock it in place, ensuring that the second core 224 does not shift or loosen during the stamping process. The threaded engagement allows for convenient replacement of the second core 224. The second base has a stepped cavity inside, the front end of which accommodates the second core 224. The second core 224 is provided with a pair of second grooves, the bottom of which is inclined. The second screw abuts against the bottom of the second groove through the second nut and the second through hole to lock it in place. The bottom of the second groove is perpendicular to the axial direction of the second through hole and the second nut.

[0030] Figure 8 A cross-sectional view of the third core mold component structure according to an embodiment of the present invention is shown; Figure 9 A schematic diagram of the third cone head structure according to an embodiment of the present invention is shown; Figure 10 A schematic diagram of the third cone head stamping state according to an embodiment of the present invention is shown; as follows: Figure 8 , Figure 9 and Figure 10As shown, further in this embodiment, the third core mold component 230 includes a third cone head 231, which includes a fourth cone portion 232. The fourth cone portion 232 enters the arc-shaped stamped automotive differential pressure pipe, stamping the front end of the automotive differential pressure pipe into the automotive differential pressure pipe to form a torch-shaped nozzle. The third core mold component 230 also includes a third core portion 233, and the third cone head 231 also includes a transition portion 234. The third cone head 231 is connected to the third core portion 233 through the transition portion 234. The outer diameter of the transition portion 234 is smaller than the outer diameter of the third core portion 233, and the outer diameter of the transition portion 234 is equal to the maximum diameter of the fourth cone portion 232. The third cone head 231 is integrally formed with the third core portion 233 through the transition portion 234. The third core mold component 230 also includes a third base and a third locking member, which have the same structure as the first base and the first locking member.

[0031] The third core 233 is disposed at one end inside the third base. The third base is locked to the third core 233 by a third locking member. The third locking member includes a third screw and a third nut, the threads of which are adapted to each other. The third nut is connected to the outer wall of the third base. The third base has a third through hole along the axial direction of the third nut, and the axial direction of the third through hole is aligned with the axis of the third nut. The third screw abuts against the third core through the third nut and the third through hole to lock it in place, ensuring that the third core 233 does not shift or loosen during the stamping process. The threaded engagement allows for convenient replacement of the third core 233. The third base has a stepped cavity inside, with the front end accommodating the third core 233. The third core 233 has a pair of third grooves, the bottom of which is inclined. The third screw abuts against the bottom of the third groove through the third nut and the third through hole to lock it in place. The bottom of the third groove is perpendicular to the axial direction of the third through hole and the third nut.

[0032] Furthermore, lubrication spraying units are provided at the positions of the upper clamping mold component 110 and the lower clamping mold component 120 to reduce friction and prevent material adhesion, thereby lubricating the forming of the torch nozzle at the end of the pipe fitting, increasing the smoothness of material flow, and reducing the friction between the mold and the material surface.

[0033] Example 2 A forming method for a multi-station progressive forming device for the end flare port of an automotive differential pressure pipe, the forming method being applicable to the multi-station progressive forming device for the end flare port of an automotive differential pressure pipe as described above, the forming method comprising: The automotive differential pressure pipe to be processed is clamped using the upper clamping mold component 110 and the lower clamping mold component 120. Move the core mold assembly 2 to align the position of the first core mold component 210 with the vehicle differential pressure pipe. After alignment, use the first core mold component 210 to flare and punch the vehicle differential pressure pipe. Move the core mold assembly 2 and align the position of the second core mold component 220 with the automotive differential pressure pipe. Use the second core mold component 220 to perform arc stamping on the flared and stamped automotive differential pressure pipe. The core mold assembly 2 is moved to align the position of the third core mold component 230 with the automotive differential pressure pipe. The third core mold component 230 is then used to perform inward flanging stamping on the arc-shaped stamped automotive differential pressure pipe. Multi-stage progressive stamping is employed, using upper / lower clamping mold components to fix the workpiece, in conjunction with the three-stage core mold assembly.

[0034] This invention utilizes a modular design and multi-stage step-by-step stamping process. The upper and lower clamping die components are designed as separate units, and the adjustable structure of the upper and lower clamping die components, combined with auxiliary components, allows for flexible clamping of pipes of different diameters, avoiding the limitations of traditional single-die systems. The first, second, and third core die components are formed gradually rather than in a single stamping process, reducing the pipe's deformation resistance and decreasing sensitivity to die dimensions, thus enabling compatibility with a wider range of pipe diameters. The three-stage progressive forming process—flaring, arc stamping, and torch nozzle shaping—decomposes complex shapes into ordered steps, with each step addressing only specific deformation areas, avoiding dimensional deviations caused by material stress concentration, resulting in more precise forming contours.

[0035] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

[0036] The above description does not provide detailed explanations of the technical aspects of each layer's patterning and etching. However, those skilled in the art should understand that various methods existing in the prior art can be used to form layers and regions of the desired shape. Furthermore, to form the same structure, those skilled in the art can also design methods that are not entirely identical to those described above.

[0037] The present invention has been described above with reference to embodiments thereof. However, these embodiments are merely illustrative and not intended to limit the scope of the invention. The scope of the invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the invention, and all such substitutions and modifications should fall within the scope of the invention.

[0038] Although embodiments of the present invention have been described in detail, it should be understood that various changes, substitutions, and modifications can be made to the embodiments of the present invention without departing from the spirit and scope of the invention.

[0039] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A multi-station progressive forming device for the end flare port of an automotive differential pressure pipe, characterized in that, include: Clamping mold assembly (1), core mold assembly (2), and auxiliary components; The clamping assembly (1) includes an upper clamping component (110) and a lower clamping component (120), which clamp the automotive differential pressure pipe to be processed through the auxiliary assembly; The core mold assembly (2) includes a first core mold component (210), a second core mold component (220), and a third core mold component (230). The first core mold component (210), the second core mold component (220), and the third core mold component (230) sequentially stamp the automotive differential pressure pipe through the auxiliary components; The first mandrel component (210) is used to flare and stamp the differential pressure tube of the vehicle, the second mandrel component (220) is used to flare and stamp the differential pressure tube of the vehicle after flaring and stamping, and the third mandrel component (230) is used to flare and stamp the differential pressure tube of the vehicle after flaring and stamping, so that the end of the differential pressure tube of the vehicle forms a torch-shaped nozzle.

2. The multi-station progressive forming device for the end flare port of the automotive differential pressure pipe according to claim 1, characterized in that, The first core mold component (210) includes a first cone (211), which includes a first cone (212), a connecting part (213), and a second cone (214). The first cone (212) and the second cone (214) are connected by the connecting part (213). The minimum diameter of the second cone (214) is greater than or equal to the maximum diameter of the first cone (212). When the first cone (211) performs flaring and stamping on the differential pressure pipe of the vehicle, the first cone (212), the connecting part (213), and the second cone (214) enter the differential pressure pipe of the vehicle in sequence. The first cone (212) is used for guidance, and the second cone (214) is used for flaring the front end of the differential pressure pipe of the vehicle.

3. The multi-station progressive forming device for the end flare port of the automotive differential pressure pipe according to claim 1, characterized in that, The second core mold component (220) includes a second cone head (221), the second cone head (221) includes a third cone portion (222) and an arc-shaped baffle (223), the arc-shaped baffle (223) is disposed at the end of the third cone portion (222) with a larger diameter, the end face of the arc-shaped baffle (223) connected to the third cone portion (222) is an arc-shaped concave structure, when the second cone head (221) performs arc-shaped stamping on the automotive differential pressure pipe, the third cone portion (222) enters the flared automotive differential pressure pipe, and the arc-shaped baffle (223) stamps the front end of the automotive differential pressure pipe into the arc of the arc-shaped baffle (223).

4. The multi-station progressive forming device for the end flare port of the automotive differential pressure pipe according to claim 1, characterized in that, The third core mold component (230) includes a third cone (231), the third cone (231) includes a fourth cone (232), the fourth cone (232) enters the automobile differential pressure tube after arc stamping, and stamps the front end of the automobile differential pressure tube into the automobile differential pressure tube to form an inwardly flanged shape.

5. The multi-station progressive forming device for the end flare port of the automotive differential pressure pipe according to claim 2, characterized in that, The first core mold component (210) further includes a first core (215) and a first limiting member (216). The first core (215) has a first channel inside, which includes a larger diameter portion and a smaller diameter portion. The end of the first cone (211) away from the first cone (212) is provided with a first nail head (217). The diameter of the first nail head (217) is larger than the largest diameter portion of the second cone (214) and larger than the diameter of the smaller diameter portion of the first channel. One end of the first nail head (217) is engaged with the smaller diameter portion, and the first limiting member (216) abuts against the other end of the larger diameter portion of the first nail head (217). The first limiting member (216) is locked with the first core (215).

6. The multi-station progressive forming device for the end flare port of the automotive differential pressure pipe according to claim 5, characterized in that, The first core mold component (210) further includes a first base (218) and a first locking member (219). The first core (215) is disposed at one end inside the first base (218), and the first base (218) is locked to the first core (215) by the first locking member (219). The first locking member (219) includes a first screw (2191) and a first nut (2192). The threads of the first screw (2191) and the first nut (2192) are adapted to each other. The first nut (2192) is connected to the outer wall of the first base (218). The first base (218) is provided with a first through hole along the axial direction of the first nut (2192). The first screw (2191) is locked to the first core (215) by abutting through the first nut (2192) and the first through hole.

7. The multi-station progressive forming device for the end flare port of the automotive differential pressure pipe according to claim 6, characterized in that, The first core (215) is provided with a pair of first grooves (2151), the bottom of the first groove (2151) is inclined, and the first screw (2191) is locked to the bottom of the first groove (2151) by the first nut (2192) and the first through hole.

8. The multi-station progressive forming device for the end flare port of the automotive differential pressure pipe according to claim 3, characterized in that, The second core mold component (220) also includes a second core (224), and the end of the arc-shaped baffle (223) away from the third cone (222) is connected to the second core (224), and the second core (224) and the arc-shaped baffle (223) are integrally formed.

9. The multi-station progressive forming device for the end flare port of the automotive differential pressure pipe according to claim 4, characterized in that, The third core mold component (230) further includes a third core (233), and the third cone (231) further includes a transition portion (234). The third cone (231) is connected to the third core (233) through the transition portion (234). The outer diameter of the transition portion (234) is smaller than the outer diameter of the third core (233), and the outer diameter of the transition portion (234) is equal to the maximum diameter of the fourth cone (232).

10. A forming method for a multi-station progressive forming device for the end flare port of an automotive differential pressure pipe, characterized in that, The forming method is applicable to the multi-station progressive forming device for the end flare port of an automotive differential pressure pipe as described in any one of claims 1 to 9. The forming method includes: The automotive differential pressure pipe to be processed is clamped using the upper clamping mold component (110) and the lower clamping mold component (120); Move the core mold assembly (2) to align the position of the first core mold component (210) with the vehicle differential pressure pipe. After alignment, use the first core mold component (210) to flare and punch the vehicle differential pressure pipe. Move the core mold assembly (2) to align the position of the second core mold component (220) with the automotive differential pressure tube, and use the second core mold component (220) to perform arc stamping on the flared and stamped automotive differential pressure tube; Move the core mold assembly (2) and align the position of the third core mold component (230) with the automotive differential pressure tube. Use the third core mold component (230) to perform internal flanging stamping on the arc-shaped stamped automotive differential pressure tube.

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