Extrusion die heating protection cover

Abstract

The utility model provides an extrusion die heating protective cover, which relates to the technical field of extrusion die heating, and solves the problem that the extrusion die is easily oxidized during the heating process. The extrusion die heating protective cover comprises a steel shell, a side wall of the steel shell is provided with a die inlet and outlet, the die inlet and outlet are configured to allow the extrusion die to pass through, and the steel shell can also be detachably connected to a steel door. It can reduce the oxidation of the extrusion die during the heating process.

Description

Technical Field

[0001] The utility model relates to the technical field of extrusion die heating, in particular to an extrusion die heating protective cover. Background Art

[0002] The extrusion die made of H13 steel will produce black oxide scale on the working surface after being heated. The existence of oxide scale has little effect on the extrusion process in a short time. However, if the heating time is long, the surface oxide scale will become thicker and then the oxide scale may peel off, thus changing the morphology of the die surface, such as forming stripes, which can easily cause scratches and stripes on the profile surface, and in severe cases directly lead to profile scraping. Utility Model Content

[0003] The first purpose of the utility model is to provide an extrusion die heating protection cover to solve the technical problem that the existing extrusion die is easily oxidized during the heating process.

[0004] The utility model provides an extrusion die heating protection cover, which comprises a steel shell. A side wall of the steel shell is provided with a die inlet and outlet, the die inlet and outlet are configured to allow the extrusion die to pass through, and the steel shell can also be detachably connected to a steel door.

[0005] The beneficial effects of the extrusion die heating protection cover of the utility model are:

[0006] By providing a steel shell, the extrusion die can be placed in the steel shell when the extrusion die is heated, and the die inlet and outlet of the steel shell are closed by a steel door detachably connected to the steel shell, thereby isolating the space inside the steel shell from the air to reduce oxidation when the extrusion die is heated. The die inlet and outlet can facilitate the removal of the extrusion die from the steel shell.

[0007] In a preferred technical solution, an air inlet is provided on the steel housing, and an air inlet valve is provided in the air inlet.

[0008] In a preferred technical solution, the air inlet is a nitrogen inlet, and the air inlet is located at the top of the steel shell.

[0009] In the preferred technical solution, the air intake valve includes an air intake steel pipe and an air intake steel cap, the end of the air intake steel pipe exposed from the steel shell is provided with an external thread, the air intake steel cap is provided with an internal thread, and the air intake steel pipe is threadedly connected to the air intake steel cap.

[0010] In a preferred technical solution, the steel shell is provided with an air outlet, and the air outlet is provided with an air outlet valve.

[0011] In a preferred technical solution, the air outlet is located at the lower part of the steel shell.

[0012] In the preferred technical solution, the air outlet valve includes an air outlet steel pipe and an air outlet steel cap, the air outlet steel pipe is provided with an external thread at one end exposed from the steel outer shell, the air outlet steel cap is provided with an internal thread, and the air outlet steel pipe is threadedly connected to the air outlet steel cap.

[0013] In the preferred technical solution, the steel shell includes a circular end face portion, a peripheral face portion and an annular end face portion, the peripheral face portion is integrally formed and connected with the circular end face portion and the annular end face portion, the air inlet is arranged at the top of the peripheral face portion, and the mold inlet and outlet are arranged on the annular end face portion.

[0014] In a preferred technical solution, the extrusion die heating protection cover further includes a lifting ear, and the lifting ear is arranged on the top of the peripheral surface portion.

[0015] In a preferred technical solution, the steel door is fixed to the annular end surface portion by two fastening bolts, one of the fastening bolts is located at the top of the steel door, and the other fastening bolt is located at the bottom of the steel door. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments or background technologies of the present invention, the drawings required for use in the embodiments or background technology descriptions are briefly introduced below. Obviously, the drawings described below are merely embodiments of the present invention, and ordinary technicians in this field can obtain other drawings based on the provided drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of the structure of the heating protection cover of the extrusion die provided in an embodiment of the utility model;

[0018] Figure 2 for Figure 1 Left view of

[0019] Figure 3 for Figure 1 Right view of .

[0020] Description of reference numerals:

[0021] 10- steel shell; 11- mold inlet and outlet; 12- circular end surface; 13- peripheral surface; 14- circular end surface; 15- lifting ear;

[0022] 20-intake valve; 21-intake steel pipe; 22-intake steel cap;

[0023] 30-air outlet valve; 31-air outlet steel pipe; 32-air outlet steel cap;

[0024] 41-Steel door; 42-Fastening bolt;

[0025] 50-Extrusion die. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0027] Embodiment 1:

[0028] Figure 1 A schematic diagram of the structure of the heating protection cover of the extrusion die provided in an embodiment of the utility model; Figure 2 for Figure 1 The left view of Figure 1 and Figure 2 As shown, the extrusion die heating protection cover provided in the first embodiment of the utility model includes a steel shell 10, and a mold inlet and outlet 11 is provided on one side wall of the steel shell 10. The mold inlet and outlet 11 is configured to allow the extrusion die 50 to pass through. The steel shell 10 can also be detachably connected to the steel door 41.

[0029] By providing the steel housing 10, when the extrusion die 50 is heated, the extrusion die 50 can be placed in the steel housing 10, and the steel door 41 detachably connected to the steel housing 10 is used to close the die inlet and outlet 11 of the steel housing 10, thereby isolating the space inside the steel housing 10 from the air to reduce oxidation when the extrusion die 50 is heated. The die inlet and outlet 11 can facilitate the extrusion die 50 to be taken out of the steel housing 10.

[0030] like Figure 1 and Figure 2 As shown, preferably, an air inlet is provided on the steel housing 10, and an air inlet valve 20 is provided in the air inlet.

[0031] By setting an air inlet in the steel shell 10 and setting an air inlet valve 20 in the air inlet, external protective gas can be delivered into the steel shell 10. Specifically, the protective gas can be nitrogen, carbon dioxide, hydrogen or helium, etc., which do not react with the extrusion die 50 made of H13 material.

[0032] like Figure 1 and Figure 2 As shown, preferably, the air inlet is a nitrogen inlet, and the air inlet is located at the top of the steel housing 10 .

[0033] Since the density of nitrogen is lower than that of air, the air inlet for introducing nitrogen is set at the top of the steel shell 10, so that the air in the steel shell 10 can be squeezed from top to bottom. This is conducive to reducing the volume occupied by air. Moreover, for the extrusion die 50, it is not a thin-skinned die. Generally speaking, the central part of the extrusion die 50, that is, the area for the extruded material to flow, is the key protected part. It can be said that in order to prevent this area from being oxidized, it is not necessary to exhaust all the air in the steel shell 10, that is, most of the tasks of preventing oxidation are completed. Therefore, setting the air inlet at the top of the steel shell 10 is conducive to ensuring that the key areas of the extrusion die 50 are not oxidized.

[0034] like Figure 1 and Figure 2 As shown, preferably, the air intake valve 20 includes an air intake steel pipe 21 and an air intake steel cap 22, the end of the air intake steel pipe 21 exposed from the steel housing 10 is provided with an external thread, the air intake steel cap 22 is provided with an internal thread, and the air intake steel pipe 21 is threadedly connected to the air intake steel cap 22.

[0035] Specifically, the air intake steel pipe 21 can be fixedly connected to the steel housing 10 by welding.

[0036] By providing the air inlet steel pipe 21 with external threads and the steel air inlet cap with internal threads, the steel air inlet cap can be unscrewed when it is necessary to introduce protective gas into the steel housing 10. When the ventilation process is completed, before the extrusion die heating protective cover is placed in the heating furnace, the steel air inlet cap can be tightened to prevent the protective gas from leaking from the air inlet steel pipe 21.

[0037] like Figure 1 and Figure 2 As shown, preferably, an air outlet is provided on the steel housing 10, and an air outlet valve 30 is provided in the air outlet.

[0038] By providing the air outlet, the air in the steel housing 10 can be discharged to reduce the air content in the steel housing 10 as much as possible, and to minimize or even eliminate the oxidation of the extrusion die 50 by the air in the steel housing 10. When the exhaust process is completed, the air outlet valve 30 can be used to close the air outlet to prevent the protective gas in the steel housing 10 from leaking.

[0039] In another implementation, the steel housing 10 may not be provided with an air outlet. Even if there is no air outlet, the original gas in the steel housing 10 is not discharged. However, since the density of the input gas is different from the original air density, the input protective gas can also compress the space occupied by the original air, reduce the contact area between the air and the extrusion die 50, and reduce the oxidation of the extrusion die 50 by the air. If the gas is a gas with a density greater than that of air, such as carbon dioxide gas, the air can be squeezed to the upper area of ​​the internal space of the steel housing 10, and the oxygen in the air no longer contacts the extrusion die 50, which can also greatly reduce or even eliminate oxidation.

[0040] like Figure 1 and Figure 2 As shown, preferably, the air outlet is located at the lower part of the steel housing 10 .

[0041] In the present embodiment, nitrogen is selected as the protective gas, and the density of nitrogen is lower than that of air. Therefore, after the nitrogen is introduced, the air is concentrated in the lower part of the internal space of the steel shell 10. The air outlet is arranged at the lower part of the steel shell 10, which is conducive to discharging the air located at the lower part of the steel shell 10 to reduce the air inside the steel shell 10.

[0042] like Figure 1 As shown, preferably, the air outlet valve 30 includes an air outlet steel pipe 31 and an air outlet steel cap 32. The end of the air outlet steel pipe 31 exposed to the steel outer shell 10 is provided with an external thread, and the air outlet steel cap 32 is provided with an internal thread. The air outlet steel pipe 31 is threadedly connected to the air outlet steel cap 32.

[0043] Specifically, the gas outlet steel pipe 31 can be fixedly connected to the steel housing 10 by welding.

[0044] By providing the gas outlet steel pipe 31 with external threads and the steel gas outlet cap with internal threads, the steel gas outlet cap can be unscrewed when it is necessary to introduce protective gas into the steel housing 10 to exhaust air. When the exhaust process is completed, before the extrusion die heating protective cover is placed in the heating furnace, the steel gas outlet cap can be tightened to prevent the protective gas from leaking from the gas outlet steel pipe 31.

[0045] like Figure 1 and Figure 2 As shown, preferably, the steel shell 10 includes a circular end surface portion 12, a peripheral surface portion 13 and an annular end surface portion 14, the peripheral surface portion 13 is integrally connected with the circular end surface portion 12 and the annular end surface portion 14, the air inlet is arranged at the top of the peripheral surface portion 13, and the mold inlet and outlet 11 are arranged on the annular end surface portion 14.

[0046] Since the steel shell 10 has a circular end surface 12, a peripheral surface 13 and an annular end surface 14, the steel shell 10 is cylindrical as a whole. The steel shell 10 is cylindrical as a whole, which is conducive to reducing the pressure unevenness and stress concentration problems caused by the increase of the gas pressure inside the steel shell 10 due to the heat during the heating process, and preventing the steel shell 10 from being damaged under the action of the internal pressure, thereby helping to increase the service life of the extrusion die heating protection cover.

[0047] like Figure 1 and Figure 2 As shown, preferably, the extrusion die heating protection cover further includes a lifting ear 15 , and the lifting ear 15 is arranged on the top of the peripheral surface portion 13 .

[0048] Specifically, the lifting lug 15 may be an inverted U-shaped lifting lug 15. The ends of the two arms of the inverted U-shape are welded to the top of the peripheral surface portion 13.

[0049] By providing the lifting lug 15, the hook of the overhead crane in the workshop can be used to hang the lifting lug 15, and the extrusion die heating protection cover and the extrusion die 50 therein can be transferred into the die heating furnace for heating and heat preservation. When the die needs to be installed on the extruder for production, the hook of the overhead crane is used to hang the lifting lug 15, and the extrusion die 50 is lifted out of the heat preservation heating furnace.

[0050] Figure 3 yes Figure 1 The right view of Figure 1 and Figure 3 As shown, preferably, the steel door 41 is fixed to the annular end surface portion 14 by two fastening bolts 42 , one fastening bolt 42 is located at the top of the steel door 41 , and the other fastening bolt 42 is located at the bottom of the steel door 41 .

[0051] The top and bottom of the steel door 41 are fixed to the annular end surface 14 by fastening bolts 42, respectively, so that the steel door 41 can be detachably connected and firmly connected. When the extrusion die 50 needs to be placed in or removed from the extrusion die heating protection cover, the fastening bolts 42 can be unscrewed from the threaded holes on the annular end surface 14, and the steel door 41 can be removed to open the die inlet and outlet 11. After the extrusion die 50 is placed in the extrusion die heating protection cover, the steel door 41 can be placed in the die inlet and outlet 11, and the fastening bolts 42 are aligned with the corresponding threaded holes, and the fastening bolts 42 are tightened to firmly fix the steel door 41 to the annular end surface 14.

[0052] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

[0053] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0054] In the above embodiments, the descriptions of directions such as “upper” and “lower” are all based on the drawings.

[0055] The above description of the disclosed embodiments enables professionals in the field to implement or use the utility model. Various modifications to these embodiments will be apparent to professionals in the field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model.

[0056] Therefore, the present invention will not be limited to the embodiments shown herein but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An extrusion die heating protective cover, characterized in that: The invention comprises a steel shell (10), a side wall of which is provided with a mold inlet and outlet (11), the mold inlet and outlet (11) being configured to allow an extrusion mold (50) to pass through, and the steel shell (10) can also be detachably connected to a steel door (41).

2. The extrusion die heating protective cover according to claim 1, characterized in that: The steel housing (10) is provided with an air inlet, and an air inlet valve (20) is provided in the air inlet.

3. The extrusion die heating protective cover according to claim 2, characterized in that: The air inlet is a nitrogen air inlet, and the air inlet is located at the top of the steel housing (10).

4. The extrusion die heating protective cover according to claim 3, characterized in that: The air intake valve (20) comprises an air intake steel pipe (21) and an air intake steel cap (22); one end of the air intake steel pipe (21) exposed outside the steel housing (10) is provided with an external thread, and the air intake steel cap (22) is provided with an internal thread; the air intake steel pipe (21) and the air intake steel cap (22) are threadedly connected.

5. The extrusion die heating protective cover according to claim 3, characterized in that: The steel housing (10) is provided with an air outlet, and an air outlet valve (30) is provided in the air outlet.

6. The extrusion die heating protective cover according to claim 5, characterized in that: The air outlet is located at the lower part of the steel housing (10).

7. The extrusion die heating protective cover according to claim 6, characterized in that: The gas outlet valve (30) comprises a gas outlet steel pipe (31) and a gas outlet steel cap (32); one end of the gas outlet steel pipe (31) exposed outside the steel housing (10) is provided with an external thread, and the gas outlet steel cap (32) is provided with an internal thread; the gas outlet steel pipe (31) and the gas outlet steel cap (32) are threadedly connected.

8. The extrusion die heating protective cover according to any one of claims 2 to 7, characterized in that: The steel housing (10) comprises a circular end surface portion (12), a peripheral surface portion (13) and an annular end surface portion (14); the peripheral surface portion (13) is integrally formed and connected with the circular end surface portion (12) and the annular end surface portion (14); the air inlet is arranged at the top of the peripheral surface portion (13); and the mold inlet and outlet (11) are arranged at the annular end surface portion (14).

9. The extrusion die heating protective cover according to claim 8, characterized in that: The extrusion die heating protection cover also includes a lifting ear (15), and the lifting ear (15) is arranged on the top of the peripheral surface portion (13).

10. The extrusion die heating protective cover according to claim 8, characterized in that: The steel door (41) is fixed to the annular end surface portion (14) by two fastening bolts (42), one of the fastening bolts (42) is located at the top of the steel door (41), and the other fastening bolt (42) is located at the bottom of the steel door (41).

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