Engine exhaust pipe forming device

Abstract

The utility model discloses an engine exhaust pipe forming device, and relates to the technical field of exhaust pipe machining. The engine exhaust pipe forming device comprises a base. A lower die fixed to the base; the upper die can slide relative to the lower die along a guide column fixed to the lower die, and the upper die and the lower die jointly define a forming die cavity; a fixed plate fixed to the upper mold; the auxiliary pipe is arranged in the forming mold cavity and extends along the mold cavity; a first pneumatic mechanism at a first end of the auxiliary tube; and a second pneumatic mechanism at a second end of the auxiliary tube opposite the first end. According to the utility model, a deformed blank is extruded and rounded through pressurization, so that the drawing size requirement is met, and the forming processing of the exhaust pipe can be quickly realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to exhaust pipe processing technical field, specifically is a engine exhaust pipe forming device. BACKGROUND

[0002] When the gasoline engine is running, gasoline and air after mixing combustion cannot be completely converted into CO2 and water, but contain a certain amount of pollutants, generally carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOX), particulate matter (PM / PN, particulate matter) and the like. In order to protect the environment and meet the requirements of national automobile exhaust emission, gasoline engine for vehicle needs to be equipped with exhaust purification device, wherein, three-way catalyst (TWC, three-way catalytic converter) is responsible for the conversion of HC, CO, NOX, and the particulate trap (GPF, gasoline particulate filter) removes carbon particles in the exhaust.

[0003] The traditional processing technology of engine exhaust pipe is to first bend the steel plate to form a bent pipe, then weld the forming, then cut the pipe, then artificially shape the exhaust pipe, and finally punch the exhaust pipe.

[0004] The traditional engine exhaust pipe processing method is very low in efficiency, and the labor intensity is large, and the traditional process has the problem of poor angle when bending the pipe on the pipe bender, and the exhaust pipe forming efficiency is low.

[0005] Therefore, a device for shaping the bent pipe is needed. UTILITY MODEL CONTENT

[0006] The utility model discloses a kind of engine exhaust pipe forming devices, and pipe material blank is extruded into shape by mould (profile structure, refers to die cavity is not vertical passage).To solve the technical problems proposed in the above background technology.

[0007] To achieve the above object, the utility model provides the following technical scheme:

[0008] A kind of engine exhaust pipe forming device, the engine exhaust pipe forming device includes: base;Fixed to the lower die of base;Upper die, the upper die can be slid relative to the lower die along the guide column fixed to the lower die, and the upper die and the lower die jointly define forming die cavity;Fixed plate fixed to the upper die;Auxiliary pipe arranged in the forming die cavity and along die cavity extends;First pneumatic mechanism at the first end of auxiliary pipe;And second pneumatic mechanism at the second end opposite to the first end of auxiliary pipe.

[0009] In some embodiments, the fixed plate is positioned to the upper die by one or more keys.

[0010] In some embodiments, the engine exhaust pipe forming device includes at least two locking pieces configured to lock the upper die and the lower die in contact with each other.

[0011] In some embodiments, the at least two locking pieces include locking pieces arranged at a third side and a fourth side of the engine exhaust pipe forming device, respectively, wherein the third side and the fourth side of the engine exhaust pipe forming device are opposite to each other and are both adjacent to the first end and the second end of the auxiliary pipe.

[0012] In some embodiments, the first gas pressure mechanism includes a main body including a gas inlet and a gas outlet, and a transmission pipe detachably connected to the main body, the transmission pipe being in fluid communication with the gas outlet at one end and being in fluid communication with the auxiliary pipe at the other end when connected to the auxiliary pipe.

[0013] In some embodiments, the second gas pressure mechanism includes a main body including a gas inlet and a gas outlet, and a transmission pipe detachably connected to the main body, the transmission pipe being in fluid communication with the gas outlet at one end and being in fluid communication with the auxiliary pipe at the other end when connected to the auxiliary pipe.

[0014] In some embodiments, the transmission pipe of the first gas pressure mechanism or the second gas pressure mechanism is threadedly connected to the auxiliary pipe.

[0015] In some embodiments, the second gas pressure mechanism includes a sealing element for sealing the auxiliary pipe.

[0016] In some embodiments, a guide sleeve is provided on the guide column.

[0017] Compared with the prior art, the engine exhaust pipe forming device has the following beneficial effects:

[0018] In use, the blank is first placed outside the auxiliary pipe in the mold cavity, and then the upper die and the lower die extrude the blank to form the shape of the exhaust pipe. At the same time or thereafter, the introduction of high-pressure gas by the gas pressure mechanism causes the exhaust pipe preform to be extruded outward by the auxiliary pipe, so that the deformed preform is extruded and rounded to meet the size profile requirements. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic view of the engine exhaust pipe forming device.

[0020] Figure 2 is a schematic view of the engine exhaust pipe forming device.

[0021] Figure 3 is another schematic view of the engine exhaust pipe forming device.

[0022] Figure 4 is an exploded side view of an engine exhaust pipe forming device.

[0023] Figure 5 is Figure 3 is a partial enlarged view of part A in figure 1. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be apparently and completely described in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those of ordinary skill in the art without any creative work fall within the scope of protection of the present application.

[0025] Please refer to Figures 1-5 In the embodiments of the present application, an engine exhaust pipe forming device comprises a base 1, a lower die 2 fixed to the base 1, an upper die 3 capable of sliding relative to the lower die 2 along a guide column 9 fixed to the lower die, and the upper die 3 and the lower die 2 jointly defining a forming cavity 11, a fixed plate 4 fixed to the upper die 3, an auxiliary pipe 18 arranged in the forming cavity 11 and extending along the cavity, a first pneumatic mechanism 6 at a first end of the auxiliary pipe 18, and a second pneumatic mechanism 7 at a second end of the auxiliary pipe 18 opposite the first end.

[0026] In some embodiments, the fixed plate 4 is positioned to the upper die through one or more keys 8 (for example, flat keys, Figure 4 only the side of the key 8 is shown in figure 1). The key 8 can function as accurate positioning, ensuring the alignment effect of the upper die 3 and the lower die 2, and preventing misalignment during installation. The upper die 3 is further fixed to the fixed plate 4 through bolts; and the fixed plate 4 is provided with threaded holes for facilitating the fixation of the bolts and the hydraulic machine.

[0027] In some embodiments, the engine exhaust pipe forming device comprises at least two locking pieces 5 configured to lock the upper die 3 and the lower die 2 in contact with each other.

[0028] In some embodiments, the at least two locking pieces 5 comprise locking pieces respectively arranged at a third side and a fourth side of the engine exhaust pipe forming device, wherein the third side and the fourth side of the engine exhaust pipe forming device are opposite to each other and adjacent to the first end and the second end of the auxiliary pipe (as best shown in Figure 1 The provision of the locking pieces 5 improves the locking effect of the lower die 2 and the upper die 3, and ensures the sealing property of the lower die 2 and the upper die 3 when high-pressure gas is introduced.

[0029] In some embodiments, the first gas pressure mechanism comprises: a main body 61 comprising a gas inlet 63 and a gas outlet (not shown); and a transfer pipe 62 detachably connected to the main body, which at one end is in fluid communication with the gas outlet and at the other end, when connected to the auxiliary pipe 18, is in fluid communication with the auxiliary pipe. During or after the extrusion of the blank by the upper die and the lower die, the high pressure gas introduced through the gas inlet and the gas outlet of the main body 61 and the transfer pipe is beneficial to the shaping of the deformed preform, preventing problems such as thinning of conventional elbow materials.

[0030] In some embodiments, similarly to the first gas pressure mechanism, the second gas pressure mechanism comprises: a main body comprising a gas inlet and a gas outlet; and a transfer pipe detachably connected to the main body, which at one end is in fluid communication with the gas outlet and at the other end, when connected to the auxiliary pipe, is in fluid communication with the auxiliary pipe.

[0031] In some embodiments, the transfer pipe of the first gas pressure mechanism or the second gas pressure mechanism is threadedly connected to the auxiliary pipe.

[0032] In some embodiments, the second gas pressure mechanism does not require a transfer pipe, but only comprises a sealing element, such as a sealing plug (not shown in the drawings), for closing the auxiliary pipe.

[0033] In some embodiments, a guide sleeve 10 is provided on the guide column 9.

[0034] By adopting the above technical solution, when in use, the blank 19 is first placed outside the auxiliary pipe 18 in the die cavity 11, and then the upper die 3 is lowered along the guide column 9 to extrude the blank 19 together with the lower die 2 to form the shape of the exhaust pipe.

[0035] In this embodiment, the lower die 2 is fixed on the base 1 by means of counterbore bolts; the base 1 is fixed on the workbench.

[0036] By adopting the above technical solution, the fixing of the exhaust pipe forming device and the press is facilitated.

[0037] As a further illustration of this embodiment, the shape of the die cavity allows multiple bending positions of the pipe blank 19 to be achieved in one forming.

[0038] In some embodiments, when the mold is closed, the mold will flatten the blank, resulting in insufficient roundness of the finally formed pipe, so the die cavity 11 is designed to be non-circular but slightly oval in shape, which can slightly compensate during forming to improve the roundness of the cross section of the product. The flattened pipe is lifted by high pressure to increase the roundness of the exhaust pipe.

[0039] Compared with the traditional elbow pipe, cutting pipe, shaping and punching machining process, the machining method is simple, greatly reduces the labor intensity, and improves the forming efficiency of the exhaust pipe.

[0040] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments should, therefore, be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalents of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the scope of the claims concerned.

[0041] Furthermore, it should be understood that although the present specification describes exemplary embodiments, the application is not limited to only one independent technical solution in each embodiment, and the specification is described in this way only for the sake of clarity. A person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. An engine exhaust pipe forming apparatus characterized by comprising: The engine exhaust pipe forming device comprises: a base; a lower die fixed to the base; an upper die capable of sliding relative to the lower die along a guide post fixed to the lower die, and the upper die and the lower die together defining a forming cavity; a fixing plate fixed to the upper die; an auxiliary pipe arranged in the forming cavity and extending along the cavity; a first pneumatic mechanism at a first end of the auxiliary pipe; and a second pneumatic mechanism at a second end of the auxiliary pipe opposite the first end.

2. The engine exhaust pipe forming apparatus according to claim 1, characterized by The fixing plate is positioned to the upper die by one or more keys.

3. The engine exhaust pipe forming apparatus according to claim 1, characterized by The engine exhaust pipe forming device comprises at least two locking pieces configured to lock the upper die and the lower die in contact with each other.

4. The engine exhaust pipe forming apparatus according to claim 3, wherein The at least two locking pieces comprise locking pieces arranged on a third side and a fourth side of the engine exhaust pipe forming device respectively, wherein the third side and the fourth side of the engine exhaust pipe forming device are opposite to each other and adjacent to the first end and the second end of the auxiliary pipe.

5. The engine exhaust pipe forming apparatus according to claim 1, wherein The first pneumatic mechanism comprises: a main body comprising an air inlet and an air outlet; and a transmission pipe detachably connected to the main body, the transmission pipe being in fluid communication with the air outlet at one end and in fluid communication with the auxiliary pipe at the other end when connected to the auxiliary pipe.

6. The engine exhaust pipe forming apparatus according to claim 5, wherein The second pneumatic mechanism comprises: a main body comprising an air inlet and an air outlet; and a transmission pipe detachably connected to the main body, the transmission pipe being in fluid communication with the air outlet at one end and in fluid communication with the auxiliary pipe at the other end when connected to the auxiliary pipe.

7. The engine exhaust pipe forming apparatus according to claim 5 or 6, characterized by, The transmission pipe of the first pneumatic mechanism or the second pneumatic mechanism is threadedly connected to the auxiliary pipe.

8. The engine exhaust pipe forming apparatus according to claim 5, wherein The second pneumatic mechanism comprises a sealing element for sealing the auxiliary pipe.

9. The engine exhaust pipe forming apparatus according to claim 1, wherein A guide sleeve is provided on the guide post.

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