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

Abstract

The present application relates to the technical field of automobile accessory processing, and specifically relates to a multi-station progressive forming device and forming method for the end of a differential pressure pipe of an automobile, comprising a clamping die assembly, a core die assembly and an auxiliary assembly; the core die assembly comprises a first core die component, a second core die component and a third core die component; the first core die component is used for flaring stamping of the differential pressure pipe of the automobile, the second core die component is used for arc stamping of the flared and stamped differential pressure pipe of the automobile, and the third core die component is used for inside flanging stamping of the arc stamped differential pressure pipe of the automobile. The adjustable structure of the upper clamping die component, the lower clamping die component and the auxiliary assembly can flexibly clamp pipes with different diameters, avoiding the limitations of traditional single molds. The first, second and third core die components are formed step by step instead of one-time stamping, and the three-stage progressive forming process is used for flaring, arc stamping and torch mouth shaping, avoiding size deviation caused by material stress concentration and making the formed profile more accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile accessory processing, in particular to a multi-station progressive forming device and forming method for the torch mouth of the end of an automobile differential pressure pipe. BACKGROUND

[0002] Differential pressure pipes are used to manage the working mode of particle traps. The working principle is that a particle trap is installed in the exhaust system, and the inlet and outlet are connected to a differential pressure sensor through a differential pressure pipe. The differential pressure sensor detects the exhaust pressure in the pipe and feeds back information to the engine control system to determine whether the particle trap needs to be regenerated. When the amount of particulate matter in the particle trap increases and the pressure difference between the inlet and outlet reaches a certain threshold, the control system starts the regeneration program to remove the particulate matter, keeping the particle trap in good working condition. In the fuel system, the differential pressure pipe is used to measure the pressure difference between the output end of the fuel pump and the input end of the engine fuel injection system, ensuring that the fuel is supplied to the engine at the appropriate pressure, ensuring normal injection and combustion of the fuel, thereby achieving the effect of reducing fuel consumption.

[0003] The end of the automobile differential pressure pipe often needs to be processed into a torch mouth shape (conical flared or special curved surface) to adapt to the sealing connection or gas flow guiding requirements. The traditional forming process of the end of the automobile differential pressure pipe has a series of problems. The previous processing method often has difficulty in ensuring the accuracy when forming the torch mouth at the end of the differential pressure pipe, and it is difficult to adapt to automobile differential pressure pipes of different diameters. SUMMARY

[0004] (I) Invention purpose

[0005] The purpose of the present application is to provide a multi-station progressive forming device and forming method for the torch mouth of the end of an automobile differential pressure pipe that can adapt to different pipe diameters and improve processing accuracy.

[0006] (II) Technical solution

[0007] To solve the above problems, the present application provides a multi-station progressive forming device for the torch mouth of the end of an automobile differential pressure pipe, comprising: a mold clamping assembly, a core mold assembly and an auxiliary assembly;

[0008] The mold clamping assembly includes an upper mold clamping part and a lower mold clamping part, and the upper mold clamping part and the lower mold clamping part clamp the automobile differential pressure pipe to be processed through the auxiliary assembly;

[0009] The core mold assembly includes a first core mold part, a second core mold part and a third core mold part;

[0010] The first core mold part, the second core mold part and the third core mold part sequentially stamp the automobile differential pressure pipe through the auxiliary assembly;

[0011] The first core die component is used for flaring stamping of the automobile differential pressure pipe, the second core die component is used for arc stamping of the automobile differential pressure pipe after flaring stamping, and the third core die component is used for inner flanging stamping of the automobile differential pressure pipe after arc stamping, so that the end of the automobile differential pressure pipe forms a torch mouth shape.

[0012] In another aspect of the present application, preferably, the first core die component comprises a first taper head, the first taper head comprises a first taper part, a connecting part and a second taper part, the first taper part and the second taper part are connected through the connecting part, the minimum diameter of the second taper part is greater than or equal to the maximum diameter of the first taper part, when the flaring taper head flares the automobile differential pressure pipe, the first taper part, the connecting part and the second taper part enter the automobile differential pressure pipe in turn, the first taper part is used for guiding, and the second taper part is used for flaring the front end of the automobile differential pressure pipe.

[0013] In another aspect of the present application, preferably, the second core die component comprises a second taper head, the second taper head comprises a third taper part and an arc-shaped baffle, the arc-shaped baffle is arranged at one end of the third taper part with a larger diameter, and the end face of the third taper part connected with the arc-shaped baffle is an arc-shaped concave structure, when the second taper head performs arc stamping on the automobile differential pressure pipe, the third taper part enters the automobile differential pressure pipe after flaring, and the arc-shaped baffle stamps the front end of the automobile differential pressure pipe into the arc of the arc-shaped baffle.

[0014] In another aspect of the present application, preferably, the third core die component comprises a third taper head, the third taper head comprises a fourth taper part, the fourth taper part enters the automobile differential pressure pipe after arc stamping, and the front end of the automobile differential pressure pipe is stamped into the automobile differential pressure pipe to form a torch mouth shape.

[0015] In another aspect of the present application, preferably, the first core die component further comprises a first core part and a first limiting piece, the first core part is internally provided with a first channel, the first channel comprises a larger diameter part and a smaller diameter part, one end of the first taper head away from the first taper part is provided with a first nail head part, the diameter of the first nail head part is greater than the maximum diameter of the second taper part and greater than the diameter of the smaller diameter part of the first channel;

[0016] One end of the first nail head part is clamped outside the smaller diameter part, the other end of the first nail head part is abutted by the first limiting piece at the larger diameter part, and the first limiting piece is locked with the first core part.

[0017] In another aspect of the present application, preferably, the first core die component further comprises a first base and a first locking piece, the first core part is arranged at one end inside the first base, and the first base is locked with the first core part through the first locking piece.

[0018] The first locking member comprises a first screw and a first nut, the threads of the first screw and the first nut are adapted, the first nut is connected with the outer wall of the first base, the first base is provided with a first through hole in the axial direction of the first nut, and the first screw is locked against the first core through the first nut and the first through hole.

[0019] In another aspect of the present application, preferably, the first core is provided with a pair of first grooves, the groove bottom of the first groove is inclined, and the first screw is locked against the groove bottom of the first groove through the first nut and the first through hole.

[0020] In another aspect of the present application, preferably, the second core mold component further comprises a second core, one end of the arc-shaped baffle away from the third taper part is connected with the second core, and the second core is integrally formed with the arc-shaped baffle.

[0021] In another aspect of the present application, preferably, the third core mold component further comprises a third core, the third taper head further comprises a transition part, the third taper head is connected with the third core through the transition part, the outer diameter of the transition part is smaller than the outer diameter of the third core, and the outer diameter of the transition part is equal to the maximum diameter of the fourth taper part.

[0022] In another aspect of the present application, preferably, a forming method of a multi-station progressive forming device for an automobile differential pressure pipe end torch mouth, the forming method is suitable for the multi-station progressive forming device for an automobile differential pressure pipe end torch mouth as described above, and the forming method comprises:

[0023] Clamping the automobile differential pressure pipe to be processed by using the upper clamp mold component and the lower clamp mold component;

[0024] Moving the core mold assembly, aligning the position of the first core mold component with the automobile differential pressure pipe, and flaring the automobile differential pressure pipe by using the first core mold component after alignment;

[0025] Moving the core mold assembly, aligning the position of the second core mold component with the automobile differential pressure pipe, and arc stamping the flared automobile differential pressure pipe by using the second core mold component;

[0026] Moving the core mold assembly, aligning the position of the third core mold component with the automobile differential pressure pipe, and inner flanging the arc-shaped automobile differential pressure pipe by using the third core mold component.

[0027] (Three) beneficial effects

[0028] The above technical solutions of the present application have the following beneficial technical effects:

[0029] The present application can flexibly clamp pipe materials with different diameters by modular design and multi-process step-by-step stamping, upper and lower split design of the clamp assembly, adjustable structure of the upper clamp component combined with the lower clamp component and auxiliary assembly, avoiding the limitation of traditional single mold. The first, second and third core mold components are formed by step-by-step forming instead of one-time stamping, reducing the pipe deformation resistance and the sensitivity to mold size, thereby being compatible with a wider range of pipe diameters. The three-stage progressive forming process, flaring, arc stamping and torch mouth shaping, decomposes the complex shape into ordered steps, only processing specific deformation areas at each step, avoiding size deviation caused by material stress concentration, and the formed profile is more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic structural view of a clamp assembly and a core mold assembly of an embodiment of the present application;

[0031] Figure 2 is a sectional view of a clamp assembly and a first core mold component structure of an embodiment of the present application;

[0032] Figure 3 is a schematic view of a first taper head structure of an embodiment of the present application;

[0033] Figure 4 is a schematic view of a first taper head stamping state of an embodiment of the present application;

[0034] Figure 5 is a sectional view of a second core mold component structure of an embodiment of the present application;

[0035] Figure 6 is a schematic view of a second taper head structure of an embodiment of the present application;

[0036] Figure 7 is a schematic view of a second taper head stamping state of an embodiment of the present application;

[0037] Figure 8 is a sectional view of a third core mold component structure of an embodiment of the present application;

[0038] Figure 9 is a schematic view of a third taper head structure of an embodiment of the present application;

[0039] Figure 10 is a schematic view of a third taper head stamping state of an embodiment of the present application;

[0040] REFERENCE NUMERALS:

[0041] 1: clamp assembly, 110: upper clamp component, 120: lower clamp component,

[0042] 2: core mold assembly, 210: first core mold part, 211: first taper head, 212 first taper part, 213: connecting part, 214: second taper part, 215: first core part, 2151: first groove, 216: first limiting piece, 217: first peg head, 218: first base, 219: first locking piece, 2191: first screw, 2192: first nut,

[0043] 220: second core mold part, 221: second taper head, 222: third taper part, 223: arc-shaped baffle, 224: second core part,

[0044] 230: third core mold part, 231: third taper head, 232: fourth taper part, 233: third core part, 234: transition part. DETAILED DESCRIPTION

[0045] To make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application with reference to the specific embodiments and the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of the well-known structures and technologies will be omitted to avoid unnecessary confusion of the concept of the present application.

[0046] The structural schematic diagrams according to the embodiments of the present application are shown in the accompanying drawings. These drawings are not drawn to scale, in which some details are enlarged for the purpose of clarity and some details can be omitted. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are only exemplary, and in practice, they can be deviated due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0047] Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

[0048] In the description of the present application, it should be noted that the terms "first", "second", "third" are only for the purpose of description, and cannot be understood or implied as indicating or suggesting relative importance.

[0049] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0050] The present application will be described in more detail with reference to the accompanying drawings. In each of the drawings, the same elements are denoted by like reference numerals for the purpose of clarity. Each part in the drawings is not drawn to scale.

[0051] Example 1

[0052] 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;

[0053] 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.

[0054] 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;

[0055] 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;

[0056] 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.

[0057] 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 4A schematic view of a first cone head in a stamping state of one embodiment of the present application is shown in FIG. 1. Figure 2 、 Figure 3 and Figure 4 In this embodiment, the first core component 210 includes a first cone head 211 responsible for the pipe end flaring forming, the first cone head 211 includes a first taper portion 212, a connecting portion 213 and a second taper portion 214, the first taper portion 212 and the second taper portion 214 are connected through the connecting portion 213, the minimum diameter of the second taper portion 214 is greater than or equal to the maximum diameter of the first taper portion 212, when the first cone head 211 is used for flaring stamping of the automobile differential pressure pipe, the first taper portion 212, the connecting portion 213 and the second taper portion 214 enter the automobile differential pressure pipe in turn, the first taper portion 212 is used for guiding to ensure that the cone head smoothly enters the pipe end and avoids deflection, the first taper portion 212 is nonlinear from the smallest diameter to the largest diameter, and the shape is a small angle taper such as 15°~30°, which is convenient for initial centering, the diameter of the front end of the first taper portion 212 is almost equivalent to the inner diameter of the automobile differential pressure pipe, and the diameter of the rear end of the first taper portion 212 is greater than the inner diameter of the automobile differential pressure pipe; the connecting portion 213 connects the first taper portion 212 and the second taper portion 214, and can be cylindrical or slightly tapered to ensure smooth transition, in this embodiment, the connecting portion 213 is cylindrical, the diameter of the connecting portion 213 is equal to the maximum diameter of the first taper portion 212, and through the transition of the connecting portion 213, stress concentration leading to pipe wall cracking is avoided; the second taper portion 214 is used for flaring the front end of the automobile differential pressure pipe, the second taper portion 214 is nonlinear from the smallest diameter to the largest diameter, the second taper portion 214 enters the pipe end to force the material to expand radially to form a preliminary horn, and the taper angle of the second taper portion is determined according to the flaring angle and material flow uniformity.

[0058] Further, in the embodiment, the first core mold part 210 further comprises a first core part 215 and a first limiting part 216, the first core part 215 supports the first taper head and realizes locking and fixing, the first limiting part 216 limits the axial movement of the taper head, the first core part 215 is internally provided with a first channel, the first channel comprises a larger diameter part and a smaller diameter part, the first taper head 211 is provided with a first nail head part 217 at one end away from the first taper part 212, the diameter of the first nail head part 217 is greater than the maximum diameter of the second taper part 214 and is greater than the diameter of the smaller diameter part of the first channel; one end of the first nail head part 217 is clamped outside the smaller diameter part, the larger diameter part accommodates the first nail head part 217, part or all of the first taper part 212, the connecting part 213 and the second taper part 214 pass through the first channel and are located outside the first core part 215, the smaller diameter part limits the first nail head part 217 to achieve the purpose of limiting the axial displacement of the first taper head 211, and the axial displacement limited by this part is forward displacement. The other end of the first nail head part 217 abuts against the larger diameter part of the first limiting part 216, the first limiting part 216 is locked with the first core part 215, the first limiting part 216 limits the axial displacement as backward displacement, further, the first limiting part 216 can be a column, which is threadedly connected in the channel of the first core part 215 and directly screwed to press the first nail head part 217, or the column has a clamping part matched with the channel of the first core part 215. Further, the first core part 215 is provided with a limiting groove at one end close to the first taper part 212, the limiting groove is through the first channel, the diameter of the limiting groove is greater than the diameter of the smaller diameter part of the first channel, which is used to provide space for accommodating the automobile differential pressure pipe when flaring and is also used to limit the maximum diameter of the automobile differential pressure pipe when flaring.

[0059] Further, the first core mold part 210 further comprises a first base 218 and a first locking part 219, the first core part 215 is arranged at one end inside the first base 218, the first base 218 is locked with the first core part 215 through the first locking part 219; the first locking part 219 comprises a first screw 2191 and a first nut 2192, the first screw 2191 and the first nut 2192 are threadedly matched, the first nut 2192 is connected with 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 axial through hole is centered with the axis of the nut, the first screw 2191 is locked with the first core part 215 through the first nut 2192 and the first through hole, which ensures that the first core part 215 does not displace or loosen during stamping, and the first core part 215 is conveniently replaced through thread matching, the inside of the first base 218 is provided with a stepped cavity, the front end of which accommodates the first core part 215, the first core part 215 is provided with a pair of first grooves 2151, the groove bottom of the first grooves 2151 is inclined, and the first screw 2191 is locked with the groove bottom of the first grooves 2151 through the first nut 2192 and the first through hole. The groove bottom of the first grooves 2151 is perpendicular to the axial direction of the first through hole and the first nut 2192.

[0060] Figure 5 The second core mold part structure sectional view of one embodiment of the application is shown; Figure 6 The second cone head structure schematic diagram of one embodiment of the application is shown; Figure 7 The second cone head stamping state schematic diagram of one embodiment of the application is shown; Figure 5 、 Figure 6 and Figure 7As shown, further, in this embodiment, the second core mold part 220 comprises a second taper head 221, which comprises a third taper part 222 and an arc-shaped baffle 223, the arc-shaped baffle 223 is arranged at the end of the third taper part 222 with a larger diameter, the end face of the arc-shaped baffle 223 connected with the third taper part 222 is an arc-shaped concave structure, when the second taper head 221 performs arc-shaped stamping on the automobile differential pressure pipe, the third taper part 222 enters the automobile differential pressure pipe after flaring, and the third taper part 222 ensures the inner diameter of the automobile differential pressure pipe during mutual stamping, and the arc-shaped baffle 223 stamps the front end of the automobile differential pressure pipe into the arc of the arc-shaped baffle 223. The second core mold part 220 further comprises a second core part 224, one end of the arc-shaped baffle 223 away from the third taper part 222 is connected with the second core part 224, and the second core part 224 is integrally formed with the arc-shaped baffle 223. The limiting structure of the axial advancement and retreat of the second taper head 221 in the second core part 224 is the same as the limiting structure of the first taper head 211 in the first core part.

[0061] The second core part 224 is arranged at one end inside the second base, and the second base is locked with the second core part 224 through the second locking part; the second locking part comprises a second screw and a second nut, the second screw and the second nut are threadedly matched, the second nut is connected with the outer wall of the second base, the second base is provided with a second through hole in the axial direction of the second nut, the axial direction of the second through hole is centered with the axial line of the second nut, the second screw is locked with the second core part through the second nut and the second through hole, so that the second core part 224 does not displace or loosen during stamping, the second core part 224 is conveniently replaced through thread matching, the second base is internally provided with a stepped cavity, the front end of which accommodates the second core part 224, the second core part 224 is provided with a pair of second grooves, the groove bottom of the second groove is inclined, and the second screw is locked with the groove bottom of the second groove through the second nut and the second through hole. The groove bottom of the second groove is perpendicular to the axial direction of the second through hole and the second nut.

[0062] Figure 8 A third core mold part structure sectional view of one embodiment of the application is shown; Figure 9 A third taper head structure schematic view of one embodiment of the application is shown; Figure 10 A third taper head stamping state schematic view of one embodiment of the application is shown; Figure 8 、 Figure 9 and Figure 10Further, in this embodiment, the third core die component 230 includes a third taper head 231, the third taper head 231 includes a fourth taper part 232, the fourth taper part 232 enters the arc-shaped stamping automobile differential pipe, and the front end part of the automobile differential pipe is stamped into the automobile differential pipe to form a torch mouth shape. The third core die component 230 further includes a third core part 233, the third taper head 231 further includes a transition part 234, the third taper head 231 is connected with the third core part 233 through the transition part 234, the outer diameter of the transition part 234 is smaller than the outer diameter of the third core part 233, the outer diameter of the transition part 234 is equal to the maximum diameter of the fourth taper part 232, and the third taper head 231 is integrally formed with the third core part 233 through the transition part 234. The third core die component 230 further includes a third base and a third locking piece, and the third base and the third locking piece have the same structure as the first base and the first locking piece.

[0063] The third core part 233 is arranged at one end inside the third base, the third base is locked with the third core part 233 through the third locking piece, the third locking piece includes a third screw and a third nut, the third screw and the third nut are threadedly matched, the third nut is connected with the outer wall of the third base, the third base is provided with a third through hole in the axial direction of the third nut, the third through hole is axially aligned with the third nut, the third screw is locked with the third core part through the third nut and the third through hole, so that the third core part 233 does not displace or loosen during stamping, the third core part 233 is conveniently replaced through thread matching, a stepped cavity is arranged inside the third base, the front end accommodates the third core part 233, the third core part 233 is provided with a pair of third grooves, the groove bottom of the third groove is inclined, and the third screw is locked with the groove bottom of the third groove through the third nut and the third through hole. The groove bottom of the third groove is perpendicular to the axial direction of the third through hole and the third nut.

[0064] Further, the upper die component 110 and the lower die component 120 are provided with lubricating spraying units at positions, which can reduce friction and prevent material adhesion, lubricate the torch mouth formed at the end of the pipe, increase the smooth flow of the material, and reduce the friction of the mold on the surface of the material.

[0065] Embodiment two

[0066] A forming method of a multi-station progressive forming device for the torch mouth at the end of an automobile differential pipe, the forming method is suitable for the multi-station progressive forming device for the torch mouth at the end of an automobile differential pipe as described above, and the forming method comprises the following steps.

[0067] The upper die component 110 and the lower die component 120 are used to clamp the automobile differential pipe to be processed.

[0068] Moving the core die assembly 2, the position of the first core die part 210 is aligned with the automobile pressure difference pipe, and after alignment, the automobile pressure difference pipe is flared and punched by the first core die part 210;

[0069] Moving the core die assembly 2, the position of the second core die part 220 is aligned with the automobile pressure difference pipe, and the flared and punched automobile pressure difference pipe is arc-shaped punched by the second core die part 220;

[0070] Moving the core die assembly 2, the position of the third core die part 230 is aligned with the automobile pressure difference pipe, and the arc-shaped punched automobile pressure difference pipe is inner flanged punched by the third core die part 230. Through multi-stage progressive punching forming, the upper and lower clamping die parts are used to fix the workpiece, and the three-stage core die assembly is used.

[0071] The present application can flexibly clamp pipe materials of different diameters by the modular design, multi-process step-by-step punching, upper and lower split design of the clamping die assembly, adjustable structure of the upper clamping die part and the lower clamping die part combined with the auxiliary assembly, and avoids the limitation of the traditional single die. The first, second and third core die parts are gradually formed instead of one-time punching, which reduces the pipe deformation resistance and the sensitivity to the size of the die, so as to be compatible with a wider range of pipe diameters. The three-stage progressive forming process, flaring, arc-shaped punching and torch mouth shaping, decomposes the complex shape into ordered steps, only processes a specific deformation area at each step, avoids size deviation caused by material stress concentration, and forms a more accurate profile.

[0072] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation on the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all variations and modifications falling within the scope and boundary of the appended claims, or the equivalent forms of such scope and boundary.

[0073] In the above description, the technical details of the patterning, etching, etc. of each layer are not described in detail. However, those skilled in the art should understand that the layers, regions, etc. of the required shape can be formed by various means in the prior art. In addition, those skilled in the art can also design methods that are not exactly the same as the methods described above in order to form the same structure.

[0074] The present application has been described above with reference to the embodiments of the present application. However, these embodiments are only for illustrative purposes, and are not intended to limit the scope of the present application. The scope of the present application is defined by the appended claims and their equivalents. Without departing from the scope of the present application, those skilled in the art can make various substitutions and modifications, which should fall within the scope of the present application.

[0075] Although the embodiments of the present application have been described in detail, it should be understood that various changes, substitutions and alterations can be made to the embodiments without departing from the spirit and scope of the present application.

[0076] Obviously, the above-described embodiments are only examples for clearly illustrating the present application and are not intended to limit the embodiments. Based on the above description, one of ordinary skill in the art can make other different forms of changes or modifications. Here, it is not necessary or possible to enumerate all the embodiments. The obvious changes or modifications derived from the above should be within the scope of the present application.

Claims

1. A multi-station progressive forming device for the end of a differential pressure pipe of an automobile, characterized in that, The utility model relates to a kind of automobile differential pressure pipe stamping device, including: Clamping die assembly (1), core die assembly (2) and auxiliary assembly; The clamping die assembly (1) includes upper clamping die part (110) and lower clamping die part (120), and the upper clamping die part (110) and lower clamping die part (120) are clamped to be processed automobile differential pressure pipe by the auxiliary assembly; The core die assembly (2) includes first core die part (210), second core die part (220) and third core die part (230); The first core die part (210), second core die part (220) and third core die part (230) are sequentially stamped to automobile differential pressure pipe by the auxiliary assembly; The first core die part (210) is used to expand the stamping of automobile differential pressure pipe, the second core die part (220) is used to arc stamping after the automobile differential pressure pipe of expanding stamping, and the third core die part (230) is used to inside flanging stamping after the automobile differential pressure pipe of arc stamping, so that automobile differential pressure pipe end forms torch mouth shape; The first core die part (210) includes first taper head (211), and the first taper head (211) includes first taper part (212), connecting part (213) and second taper part (214), the first taper part (212) and second taper part (214) are connected by the connecting part (213), and the minimum diameter of the second taper part (214) is greater than or equal to the maximum diameter of the first taper part (212), when the first taper head (211) expands the stamping of automobile differential pressure pipe, the first taper part (212), connecting part (213) and second taper part (214) sequentially enter automobile differential pressure pipe, and the first taper part (212) is used to guide, and the second taper part (214) is used to expand the front end of automobile differential pressure pipe; The second core die part (220) includes second taper head (221), and the second taper head (221) includes third taper part (222) and arc baffle (223), and the arc baffle (223) is arranged at the diameter larger end of the third taper part (222), and the end face that the arc baffle (223) is connected with the third taper part (222) is arc concave structure, when the second taper head (221) is arc stamped to automobile differential pressure pipe, the third taper part (222) enters the automobile differential pressure pipe after expanding, and the arc baffle (223) is stamped into the arc of the arc baffle (223) to the front end of automobile differential pressure pipe; The third core die part (230) includes third taper head (231), and the third taper head (231) includes fourth taper part (232), and the fourth taper part (232) enters the automobile differential pressure pipe after arc stamping, and the front end portion of automobile differential pressure pipe is stamped into automobile differential pressure pipe, to form inside flanging shape.

2. The multi-station progressive forming device for the end of the pressure differential pipe of the automobile according to claim 1, characterized in that, The first core mold component (210) further comprises a first core (215) and a first limiting piece (216), the first core (215) is internally provided with a first channel, the first channel comprises a larger diameter part and a smaller diameter part, the first taper head (211) is provided with a first nail head (217) at one end away from the first taper (212), the diameter of the first nail head (217) is greater than the maximum diameter of the second taper (214) and is greater than the diameter of the smaller diameter part of the first channel; One end of the first nail head (217) is clamped outside the smaller diameter part, the other end of the first nail head (217) is abutted by the first limiting piece (216) at the larger diameter part, and the first limiting piece (216) is locked with the first core (215).

3. The multi-station progressive forming device for automobile differential pressure pipe end torch mouth according to claim 2, characterized in that, The first core mold component (210) further comprises a first base (218) and a first locking piece (219), the first core (215) is arranged at one end inside the first base (218), and the first base (218) is locked with the first core (215) through the first locking piece (219); The first locking piece (219) comprises a first screw (2191) and a first nut (2192), the threads of the first screw (2191) and the first nut (2192) are matched, the first nut (2192) is connected with the outer wall of the first base (218), the first base (218) is provided with a first through hole in the axial direction of the first nut (2192), and the first screw (2191) is locked in abutment with the first core (215) through the first nut (2192) and the first through hole.

4. The multi-station progressive forming device for automobile differential pressure pipe end torch mouth according to claim 3, characterized in that, The first core (215) is provided with a pair of first grooves (2151), the groove bottom of the first groove (2151) is inclined, and the first screw (2191) is locked in abutment with the groove bottom of the first groove (2151) through the first nut (2192) and the first through hole.

5. The multi-station progressive forming device for automobile differential pressure pipe end torch mouth according to claim 1, characterized in that, The second core mold component (220) further comprises a second core (224), one end of the arc-shaped baffle (223) away from the third taper (222) is connected with the second core (224), and the second core (224) is integrally formed with the arc-shaped baffle (223).

6. The multi-station progressive forming device for the end of the pressure differential pipe of the automobile flare according to claim 1, characterized in that, The third core mold component (230) further comprises a third core (233), the third taper head (231) further comprises a transition part (234), the third taper head (231) is connected with the third core (233) through the transition part (234), the outer diameter of the transition part (234) is smaller than the outer diameter of the third core (233), and the outer diameter of the transition part (234) is equal to the maximum diameter of the fourth taper (232).

7. 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 suitable for the automobile differential pressure pipe end torch mouth multi-station progressive forming device as claimed in any one of claims 1 to 6, and the forming method comprises: Clamping the automobile differential pressure pipe to be processed by using the upper clamp mold component (110) and the lower clamp mold component (120); Moving the core mold assembly (2), aligning the position of the first core mold part (210) with the automobile pressure difference pipe, and after alignment, flaring stamping the automobile pressure difference pipe by using the first core mold part (210); Moving the core mold assembly (2), aligning the position of the second core mold part (220) with the automobile pressure difference pipe, and arc stamping the flared and stamped automobile pressure difference pipe by using the second core mold part (220); Moving the core mold assembly (2), aligning the position of the third core mold part (230) with the automobile pressure difference pipe, and inside flanging stamping the arc stamped automobile pressure difference pipe by using the third core mold part (230).

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