Pipe end forming tool for automobile exhaust pipe fitting

Abstract

The utility model discloses a pipe end forming tool for an automobile exhaust pipe fitting, which relates to the technical field of automobile exhaust pipe fitting forming and comprises a movable forming part and a fixed forming part. The movable forming part comprises a core penetrating base, a core penetrating body, an inner male die fixing module, a male die adjusting module and a male die body. The fixed forming part comprises a female die fixing module and an outer female die adjusting module; according to the pipe end forming tool for the automobile exhaust pipe fitting, one-time clamping and one-time forming can be achieved, and in the pipe end forming process, a traditional device for segmented operation of pre-expansion and opening expansion is changed into a structural module of an expansion and shrinkage integrated mold; therefore, the comprehensive problems of high labor intensity, low efficiency and high cost caused by frequent replacement of devices for processing in the prior art are solved; and a simple and rapid technological process is realized, so that the labor intensity is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive exhaust pipe forming, and specifically relates to a tube end forming tooling for automotive exhaust pipes. Background Art

[0002] After the welded pipe fittings of the automotive exhaust system are welded, the tube ends of the pipe fittings need to be hydraulically formed before they can be connected and used with other pipe fittings; for the original processing process route of the tube end forming of the pipe fittings: first pre-expand the tube end and then expand the mouth. During the process of expanding the mouth, use an expanding device to first pre-expand the tube end of the pipe fitting to be processed and then process and form it, and it is necessary to replace the device and expand the mouth again to complete the processing operation; during the pre-expansion and mouth-expanding processing of the tube end of the pipe fitting, there will be multiple discontinuous processing modes, and the device needs to be replaced for the first pre-expansion and the second mouth-expansion, and the pipe fitting keeps falling to the ground; however, such a processing method will cause waste of costs such as equipment, personnel, and working hours, and the processing efficiency of the pipe fitting is low. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a tube end forming tooling for automotive exhaust pipes, so as to solve the problems of waste of costs such as equipment, personnel, and working hours in the existing tube end forming processing method of pipe fittings, and the low processing efficiency of pipe fittings as mentioned in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A tube end forming tooling for automotive exhaust pipes, including a core-through base and a core-through main body on its top surface. An inner punch fixing module is sleeved on the upper part of the core-through main body. A punch adjusting module and a punch main body above it are sleeved outside the inner punch fixing module. A circular die fixing module fixedly arranged through a fixing bracket is sleeved outside the punch main body. An outer die adjusting module is arranged on the inner side wall of the die fixing module.

[0005] Preferably, the core-through base is cylindrically arranged and connected to the movable hydraulic main shaft of a hydraulic press; a through stepped axial center through hole is arranged at the axial center of the core-through base, and a plurality of stepped through holes on the same circumference outside it; an inwardly concave core-through screw hole is arranged at the axial center of the bottom surface of the core-through main body.

[0006] Preferably, the core-through main body is conically arranged, and eight bevel forming surfaces with the same specifications and opposite to each other in pairs are arranged on the outer side surface of the cone, and an inner punch fixing module that can slide along its surface is arranged through the matching of the eight bevel forming surfaces.

[0007] Preferably, a multi-sided conical through-hole that matches the vertebral body of the core-piercing main body is provided at the axis center of the inner punch fixing module. A ring-shaped stopper that protrudes radially outward is provided near the bottom on the outer side wall of the inner punch fixing module. A ring-shaped groove is provided in the middle of the vertical height of the outer side wall of the ring-shaped stopper, and a ring-shaped locking stopper ring is installed and clamped therein. The outer side wall of the inner punch fixing module is sleeved with a ring-shaped punch adjusting module and the punch main body above it near the upper part of the ring-shaped stopper.

[0008] Preferably, a ring-shaped clamping plate that protrudes radially outward is provided at the outermost edge of the punch adjusting module. The die fixing module is provided with a ring-shaped guiding groove that matches it at the corresponding position of the ring-shaped clamping plate.

[0009] Preferably, the punch main body is arranged in a cylindrical shape sleeved on the outer side of the inner punch fixing module. The lower part thereof is provided with a multi-stage pipe end expansion forming surface that protrudes radially outward and the pipe diameters of which increase in sequence. The variable-diameter corners of the multi-stage pipe end expansion forming surface are all arranged in an arc shape.

[0010] Preferably, the die fixing module is arranged in a circular ring shape, and a multi-stage forming concave surface that matches the shape of the multi-stage pipe end expansion forming surface is provided near the bottom on its inner wall.

[0011] Preferably, the pipe wall shape of the outer die adjusting module matches the inner wall shape of the die fixing module.

[0012] Preferably, and multiple types of the outer die adjusting modules are provided according to different thicknesses.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] The tube end forming tooling for automobile exhaust pipe parts provided by the present utility model can achieve one-time clamping and one-time forming. During the tube end forming process, the device for traditional segmented operations of pre-expansion and expansion is changed into a structural module of a combined expansion and contraction die, thereby solving the comprehensive problems of high labor intensity, low efficiency, and high cost caused by frequent replacement of devices in traditional processing; realizing a simple and fast process, thereby reducing the labor intensity and improving the production efficiency. Description of the Drawings

[0015] Figure 1 is an axonometric view;

[0016] Figure 2 is an axonometric view;

[0017] Figure 3 is a front view;

[0018] Figure 4 is Figure 3Cross-sectional view taken along A-A;

[0019] Figure 5 is Figure 4 structural schematic diagram of;

[0020] Figure 6 is Figure 5 enlarged view of B in;

[0021] In the figure: core-through base - 1, stepped axial through-hole - 11, stepped through-hole - 12, core-through main body - 2, core-through threaded hole - 21, inner punch fixing module - 3, multi-sided tapered through-hole - 31, annular stop - 32, annular locking stop ring - 33, punch adjusting module - 4, annular clamping plate - 41, punch main body - 5, multi-stage pipe-end expansion forming surface - 51, die fixing module - 6, annular guiding groove - 61, multi-stage forming concave surface - 61, outer die adjusting module - 7. Specific embodiments

[0022] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Please refer to Figures 1-6 , Figure 1 is an axonometric view; Figure 2 is an axonometric view; Figure 3 is a front view; Figure 4 is Figure 3 cross-sectional view taken along A-A in; Figure 5 is Figure 4 structural schematic diagram of; Figure 6 is Figure 5 enlarged view of B in.

[0024] The present invention provides a tube-end forming tooling for automotive exhaust pipe fittings, which is used for the hydroforming of welded pipe fittings in an automotive exhaust system; it includes a cylindrically arranged core-through base 1 connected to the movable hydraulic main shaft of a hydraulic press. A conical core-through main body 2 is arranged on the top surface of the core-through base 1. An inner punch fixing module 3 is sleeved on the upper part of the cone of the core-through main body 2. An annular punch adjusting module 4 and an annular punch main body 5 above it are sleeved outside the inner punch fixing module 3. An annular die fixing module 6 fixedly arranged through a fixing bracket is sleeved outside the punch main body 5. An outer die adjusting module 7 is arranged on the inner side wall of the die fixing module 6.

[0025] A penetrating stepped axial through hole 11 is provided at the axial center of the through-core base 1; an inwardly concave through-core screw hole 21 is provided at the axial center of the bottom surface of the through-core body 2, and the through-core base 1 is connected and fixed to the through-core body 2 through the stepped axial through hole 11 and the through-core screw hole 21, and moves synchronously with them; a plurality of stepped through holes 12 are provided on the same circumference of the outer side of the stepped axial through hole 11, which are used to connect and fix the through-core base 1 to the movable hydraulic spindle of the hydraulic press with bolts, and move synchronously with them.

[0026] The outer side surface of the cone body of the core-penetrating body 2 is provided with eight inclined molding surfaces of the same specification and opposite to each other, and the eight inclined molding surfaces are matched with an inner punch fixing module 3 that can slide along the surface.

[0027] A polygonal conical through hole 31 that matches the vertebral body of the core-penetrating body 2 is provided at the axis center of the inner punch fixing module 3, so that the inner punch fixing module 3 can be sleeved on the upper part of the core-penetrating body 2 and can slide along its outer side surface; an annular stopper 32 extending radially outward is provided on the outer wall of the inner punch fixing module 3 near its bottom, and an annular groove is provided in the middle of the vertical height of the outer wall of the annular stopper 32, and an annular locking ring 33 is clamped therein, and the radial outward movement limit of the inner punch fixing module 3 can be limited by the annular locking ring 33; the outer wall of the inner punch fixing module 3 is sleeved with an annular punch adjustment module 4 and a punch body 5 above it, close to the annular stopper 32.

[0028] The outermost edge of the punch adjustment module 4 is provided with an annular clamping plate 41 extending radially outward, and the die fixing module 6 is provided with an annular guide groove 61 matching the annular clamping plate 41 at a position corresponding to the annular clamping plate 41, thereby ensuring that no axial movement occurs between the punch adjustment module 4 and the die fixing module 6, thereby affecting the forming operation of the pipe end.

[0029] The punch body 5 is cylindrical and is sleeved on the outside of the inner punch fixing module 3. The lower part of the punch body 5 is provided with a multi-stage tube end expansion forming surface 51 which protrudes radially outward and has successively increasing tube diameters, and the diameter-changing corners of the multi-stage tube end expansion forming surface 51 are all arc-shaped. Therefore, in the process of forming the tube end of the pipe fitting, the tube end of the pipe fitting will move along the multi-stage tube end expansion forming surface 51 under the action of pressure, thereby completing the tube end forming operation.

[0030] The die fixing module 6 is arranged in a circular ring shape and has a multi-stage forming concave surface 62 on its inner wall near the bottom, which matches the shape of the multi-stage tube end expansion forming surface 51 , so that the tube end of the pipe fitting can be formed together with the multi-stage tube end expansion forming surface 51 .

[0031] An outer female die adjusting module 7 may also be provided inside the female die fixing module 6. The shape of the tube wall of the outer female die adjusting module 7 conforms to the shape of the inner wall of the female die fixing module 6, and a variety of the outer female die adjusting modules 7 are provided according to different thicknesses, so as to be used for the tube end forming operation of pipe fittings with different wall thicknesses.

[0032] During use, the tube end of the welded pipe fitting of the automobile exhaust system that needs to be subjected to tube end forming is loaded into the inside of the female die fixing module, and then the punch main body and the female die fixing module clamp and fix the pipe fitting. After that, the core penetrating main body gradually moves upward steadily. During the upward movement, the forming surface of the punch main body drives the tube end of the pipe fitting to expand outward steadily, so that the pipe fitting is shaped during the expansion process until one side of the joint surface of the punch main body and the female die fixing module is clamped with each other, completing the tube end forming operation of the pipe fitting. After that, the core penetrating main body and the punch main body fall and return to the initial origin, getting out of the working state and obtaining qualified products.

[0033] The tube end forming tooling for automobile exhaust pipe fittings provided by the present utility model can achieve one-time clamping and one-time forming. During the tube end forming process, the device for traditional segmented operations of pre-expansion and flaring is changed into a structural module of a combined expansion and contraction die, thereby solving the comprehensive problems of high labor intensity, low efficiency, and high cost caused by the traditional frequent replacement of devices for processing; realizing a simple and fast process, thereby reducing the labor intensity and improving the production efficiency.

[0034] Although the embodiments of the present utility model have been shown and described, obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, for those of ordinary skill in the art, it can be understood that without departing from the principle and spirit of the present utility model, all other embodiments obtained by making various changes, modifications, substitutions, and variations to these embodiments without creative work belong to the protection scope of the present utility model.

Claims

1. An end forming tooling for an automotive exhaust pipe component, characterized in that: The invention comprises a core-through base (1) and a core-through body (2) on its top surface, wherein an inner punch fixing module (3) is sleeved on the upper part of the core-through body (2), a punch adjustment module (4) and a punch body (5) above the inner punch fixing module (3) are sleeved on the outer side of the inner punch fixing module (3), a ring-shaped die fixing module (6) fixed by a fixing bracket is sleeved on the outer side of the die body (5), and an outer die adjustment module (7) is arranged on the inner side wall of the die fixing module (6).

2. The tube end forming tooling for automobile exhaust pipe parts according to claim 1, characterized in that: The through-core base (1) is cylindrical and connected to the movable hydraulic main shaft of the hydraulic press; a stepped axial through hole (11) is provided at the axis of the through-core base (1) and a plurality of stepped through holes (12) on the same circumference of its outer side; and a concave through-core screw hole (21) is provided at the axis of the bottom surface of the through-core body (2).

3. The automotive exhaust pipe end forming tooling according to claim 2, characterized in that: The core-penetrating body (2) is arranged in a cone shape, and eight inclined molding surfaces of the same specification and opposite to each other are arranged on the outer side surface of the cone body, and an inner punch fixing module (3) that can slide along the surface of the eight inclined molding surfaces is matched and arranged.

4. The forming tool for the pipe end of the automobile exhaust pipe part according to claim 3, characterized in that: A polygonal conical through hole (31) matching the vertebral body of the core-penetrating body (2) is provided at the axis center of the inner punch fixing module (3); an annular stopper (32) extending radially outward is provided on the outer wall of the inner punch fixing module (3) near its bottom; an annular groove is provided in the middle of the vertical height of the outer wall of the annular stopper (32) and an annular locking stopper ring (33) is clamped therein; the outer wall of the inner punch fixing module (3) is sleeved with an annular punch adjustment module (4) and a punch body (5) above it, close to the annular stopper (32).

5. The forming tool for the pipe end of the automobile exhaust pipe part according to claim 4, characterized in that: The outermost edge of the male die adjustment module (4) is provided with an annular clamping plate (41) extending radially outward, and the female die fixing module (6) is provided with an annular guide groove (61) matching the annular clamping plate (41) at a position corresponding to the annular clamping plate (41).

6. The forming tool for the pipe end of the automobile exhaust pipe part according to claim 5, characterized in that: The punch body (5) is a cylindrical arrangement sleeved on the outside of the inner punch fixing module (3), and its lower part is provided with a multi-stage tube end expansion forming surface (51) which protrudes radially outward and has a tube diameter that increases successively, and the diameter-changing corners of the multi-stage tube end expansion forming surface (51) are all arc-shaped.

7. The tube end forming tooling for the automobile exhaust pipe part according to claim 6, wherein: The die fixing module (6) is arranged in a circular ring shape and has a multi-stage forming concave surface (62) on its inner wall near the bottom, which matches the shape of the multi-stage tube end expansion forming surface (51).

8. The automotive exhaust pipe end forming tooling according to claim 7, wherein: The tube wall shape of the outer die adjustment module (7) matches the inner wall shape of the die fixing module (6).

9. The tube end forming tooling for automotive exhaust pipe parts according to any one of claims 1-8, characterized in that: Furthermore, the outer die adjustment module (7) is provided in a variety of ways according to different thicknesses.

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