Electrically conductive heated end collet for metal tube gas expansion hot stamping

Abstract

The utility model provides a kind of electrically conductive heating end part chuck of metal pipe air expansion hot stamping forming, including sealing end, pivot, inner rising valve, conical nut and outer rising type sealing ring, wherein, the pivot rotation is set on the sealing end, for inserting in the middle position at the inner cavity of metal pipe type material;Inner rising valve rotation is set on the side of the sealing end, for inserting the metal pipe type material, the pivot is located the inside of the inner rising valve.By the pivot and inner rising valve are inserted into metal pipe type material inside simultaneously, and drive pivot rotation, complete the clamping processing of metal pipe type material, by the air pipe supply gas passing through air hole, complete the aeration processing of metal pipe type material, the chuck of the application can be adapted to the shape of metal pipe type material and be clamped, and after clamping, the inside of metal pipe type material can be sealed and inflated, facilitate the air expansion hot stamping forming processing of metal pipe type material.

Description

Technical Field

[0001] This utility model relates to the field of metal tube gas expansion hot stamping technology, and in particular to a conductive heating end clamp for metal tube gas expansion hot stamping. Background Technology

[0002] Metal tube hot stamping technology can be used to produce lightweight parts with high strength and continuously varying cross-sections, achieving a weight reduction effect of approximately 70% compared to traditional hot stamping. Furthermore, hot-formed parts can be created with complex cross-sectional shapes that vary along the longitudinal direction of the tube, thus contributing to improved strength and stiffness.

[0003] Thermal expansion requires that gas be introduced into the pipe fitting while both ends are sealed. To reduce deformation strength, the pipe blank needs to be heated to the austenitic state. Therefore, while sealing and clamping the ends of the pipe is required, gas also needs to be introduced and electrically heated.

[0004] The invention disclosed in CN104438541A ​​proposes a production equipment for air-expansion thermoforming of pipe fittings, including a press, a thermoforming die installed in the press, a high-pressure gas system, and an axial hydraulic system. The thermoforming die includes an upper die base and a lower die base. An upper die forming insert is installed on the lower surface of the upper die base, and a lower die forming insert is installed on the upper surface of the lower die base. The lower surface of the upper die forming insert and the upper surface of the lower die forming insert are the forming surfaces of the boron steel pipe workpiece. However, since the pipe parts formed during air-expansion thermoforming of pipe fittings often have complex cross-sectional shapes, existing pipe clamps cannot adapt to different pipe cross-sectional shapes for clamping and inflation. Therefore, this solution proposes a conductive heated end clamp for air-expansion thermoforming of pipe fittings to solve the above problems. Utility Model Content

[0005] In view of this, this utility model proposes a conductive heated end clamp for tubular gas expansion hot stamping forming. By simultaneously inserting a rotating shaft and an inner expansion valve into the interior of a metal tubular material, and driving the rotating shaft to rotate, the metal tubular material is clamped. When it is necessary to inflate the metal tubular material, air is supplied through an air pipe passing through an air hole. The supplied gas, under the action of the outer expansion sealing ring and the sealing end, remains inside the metal tubular material, thus completing the inflation process. The clamp of this application can adapt to the shape of the metal tubular material for clamping, and after clamping, it can seal and inflate the interior of the metal tubular material, facilitating the gas expansion hot stamping forming process.

[0006] The technical solution of this utility model is achieved as follows: This utility model provides a conductive heating end clamp formed by hot stamping of a metal tube through air expansion, including a sealing end, a rotating shaft, an inner expansion valve, a conical nut, and an outer expansion sealing ring, wherein,

[0007] The rotating shaft is rotatably mounted on the sealing end and is used to be inserted into the middle position of the inner cavity of the metal tubular material;

[0008] An inner expansion valve is rotatably disposed on one side of the sealing end for inserting the metal tubular material. The rotating shaft is located inside the inner expansion valve, and a deformable gap is formed on the inner expansion valve. The sealing end blocks the deformable gap on the inner expansion valve.

[0009] A conical nut is threaded onto the rotating shaft, and an air hole is provided on the conical nut for the air supply pipe to pass through. The inner sidewall of the inner expansion valve includes a fitting wall, and the conical nut fits into the fitting wall.

[0010] An externally expanding sealing ring is disposed on the periphery of the internally expanding valve and is used to seal against the inner wall of the metal tubular material.

[0011] Based on the above technical solutions, preferably, the rotating shaft has a left-hand thread and a right-hand thread, the number of the conical nuts is two, the two conical nuts are respectively threaded to the left-hand thread and the right-hand thread, and the inner expansion valve includes two fitting walls that fit with the two conical nuts.

[0012] Based on the above technical solutions, preferably, the internal expansion valve includes a left pressing part and a right pressing part, and the two fitting walls are respectively formed at the connection between the left pressing part and the right pressing part.

[0013] Based on the above technical solutions, preferably, the conical nut has multiple air holes, and the multiple air holes are circumferentially equidistantly distributed.

[0014] Based on the above technical solutions, preferably, the sealing end has an air inlet through which the air supply pipe passes, and the sum of the diameters of the multiple air holes on the conical nut is smaller than the diameter of the air inlet.

[0015] Based on the above technical solutions, preferably, the number of the external expansion sealing rings is three, and the three external expansion sealing rings are arranged at equal intervals around the periphery of the internal expansion valve.

[0016] Based on the above technical solutions, preferably, the external expansion sealing ring is a metal sealing ring, and the three external expansion sealing rings are respectively located at both ends of the internal expansion valve and the middle of the internal expansion valve.

[0017] Based on the above technical solutions, preferably, the inner expansion valve has a mounting ring groove on its periphery, and the outer expansion sealing ring is disposed inside the mounting ring groove.

[0018] Based on the above technical solutions, a preferred embodiment also includes an external clamp, wherein...

[0019] The outer clamp is held on the periphery of the metal tubular material, and a cooling water channel is provided on the outer clamp.

[0020] Based on the above technical solutions, preferably, the outer clamp is further provided with interconnected water channels that communicate with the cooling water channels, and the interconnected water channels are distributed alternately with the cooling water channels.

[0021] The conductive heating end clamp formed by hot stamping of a metal tube using air expansion of this invention has the following advantages over the prior art:

[0022] (1) By simultaneously inserting the rotating shaft and the inner expansion valve into the interior of the metal tubular material and driving the rotating shaft to rotate, the clamping process of the metal tubular material is completed. The outer expansion sealing ring, located around the inner expansion valve, presses against the inner wall of the metal tubular material, thereby completing the sealing process between the inner expansion valve and the metal tubular material. The sealing end is sealed at the end of the inner expansion valve, thereby completing the sealing process at the end of the inner expansion valve. When it is necessary to inflate the metal tubular material, air is supplied through the air pipe passing through the air hole. At this time, the supplied gas is always located inside the metal tubular material under the action of the outer expansion sealing ring and the sealing end, thereby completing the inflation process of the metal tubular material. The clamp of this application can adapt to the shape of the metal tubular material for clamping, and after clamping, the interior of the metal tubular material can be sealed and inflated, which facilitates the gas expansion hot stamping forming process of the metal tubular material.

[0023] (2) By setting an external clamp for holding the outer wall of the metal tubular material, in specific implementation, the external clamp plays an auxiliary clamping role to increase the stability of the internal expansion valve holding the metal tubular material. At the same time, the external clamp also has a conductive heating device for conducting conductive heating treatment on the metal tubular material. By setting a cooling water channel on the external clamp, cooling water is circulated after the conductive heating treatment is completed to conduct rapid cooling treatment on the surface of the metal tubular material. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a front view of the conductive heating end clamp formed by hot stamping of a metal tube according to the present invention.

[0026] Figure 2 This is a cross-sectional view of the right portion of the conductive heating end clamp formed by hot stamping of a metal tube according to this utility model. Detailed Implementation

[0027] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0028] like Figures 1-2 As shown, the conductive heating end clamp formed by hot stamping of metal tube gas expansion according to this utility model includes a sealing end 1, a rotating shaft 2, an inner expansion valve 3, a conical nut 4, and an outer expansion sealing ring 5. The rotating shaft 2 is rotatably mounted on the sealing end 1 and is used to insert into the middle position of the inner cavity of the metal tube material 10. The inner expansion valve 3 is rotatably mounted on one side of the sealing end 1 and is used to insert into the metal tube material 10. The rotating shaft 2 is located inside the inner expansion valve 3, and a deformable gap is formed on the inner expansion valve 3. The sealing end 1 seals the deformable gap on the inner expansion valve 3. The conical nut 4 is threadedly connected to the rotating shaft 2, and an air hole 41 for the air supply pipe to pass through is opened on the conical nut 4. The inner side wall of the inner expansion valve 3 includes a fitting wall 33, and the conical nut 4 fits against the fitting wall 33. The outer expansion sealing ring 5 is disposed around the inner expansion valve 3 and is used to seal against the inner wall of the metal tube material 10.

[0029] In specific implementation, two sealing ends 1 are provided. When it is necessary to clamp the metal tubular material 10, the two sealing ends 1 are located at both ends of the metal tubular material 10. The rotating shaft 2 and the inner expansion valve 3 are simultaneously inserted into the metal tubular material 10 and the rotating shaft 2 is driven to rotate. At this time, the conical nut 4 can only move laterally along the extension direction of the rotating shaft 2 due to the restriction of the air tube passing through it. The rotating shaft 2 drives the conical nut 4 to move under the action of the threaded connection. The conical nut 4 pushes the inner expansion valve 3 to expand outward through the fitting wall 33 that is in contact with its surface. The inner expansion valve 3 squeezes the inside of the metal tubular material 10, thereby completing the clamping process of the metal tubular material 10. At this time, the outer expansion sealing ring 5, located around the inner expansion valve 3, presses against the inner wall of the metal tubular material 10, thereby completing the sealing treatment between the inner expansion valve 3 and the metal tubular material 10. The sealing end 1 is sealed at the end of the inner expansion valve 3, thereby completing the sealing treatment at the end of the inner expansion valve 3. When it is necessary to inflate the metal tubular material 10, air is supplied through the air pipe passing through the air hole 41. At this time, the supplied gas is always located inside the metal tubular material 10 under the action of the outer expansion sealing ring 5 and the sealing end 1, thereby completing the inflation treatment of the metal tubular material 10. The clamp of this application can adapt to the shape of the metal tubular material 10 for clamping, and after clamping, the interior of the metal tubular material 10 can be sealed and inflated, which facilitates the gas expansion hot stamping forming process of the metal tubular material 10.

[0030] In a preferred embodiment, the rotating shaft 2 has a left-hand thread 21 and a right-hand thread 22, and there are two conical nuts 4. The two conical nuts 4 are threadedly connected to the left-hand thread 21 and the right-hand thread 22 respectively. The inner expansion valve 3 includes two fitting walls 33 that fit with the two conical nuts 4.

[0031] The internal expansion valve 3 includes a left pressing part 31 and a right pressing part 32, and two mating walls 33 are respectively formed at the connection between the left pressing part 31 and the right pressing part 32.

[0032] With this design, when the shaft 2 rotates, the shaft 2 can simultaneously adjust the two conical nuts 4 to move in opposite directions through the left-hand thread 21 and the right-hand thread 22. The two conical nuts 4 can symmetrically squeeze the inner expansion valve 3 so that by squeezing the two ends of the inner expansion valve 3, the inner expansion valve 3 can stably clamp the metal tubular material 10.

[0033] In a preferred embodiment, the tapered nut 4 has multiple air holes 41, and the multiple air holes 41 are circumferentially equidistant.

[0034] With this design, multiple circumferentially distributed air holes 41 can be used to insert multiple air tubes. These multiple air tubes are circumferentially equidistant, which can uniformly supply air to the metal tubular material 10.

[0035] In a preferred embodiment, the sealing end 1 has an air inlet 11 through which the air supply pipe passes, and the sum of the diameters of the multiple air holes 41 on the conical nut 4 is smaller than the diameter of the air inlet 11.

[0036] This design allows each air tube passing through multiple air holes 41 to pass through the air inlet 11.

[0037] In a preferred embodiment, there are three external expansion sealing rings 5, and the three external expansion sealing rings 5 ​​are arranged equidistantly on the periphery of the inner expansion valve 3.

[0038] The external expansion sealing ring 5 is a metal sealing ring, and the three external expansion sealing rings 5 ​​are located at both ends of the internal expansion valve 3 and the middle of the internal expansion valve 3, respectively.

[0039] This design, with multiple externally expanding sealing rings 5, can effectively increase the sealing performance of the connection between the internally expanding valve 3 and the metal tubular material 10.

[0040] In a preferred embodiment, the inner expansion valve 3 has a mounting ring groove 34 on its periphery, and the outer expansion sealing ring 5 is disposed inside the mounting ring groove 34.

[0041] This design, within the constraints of the mounting groove 34 wall, is used to increase the installation stability of the externally expanding sealing ring 5.

[0042] In a preferred embodiment, an outer clamp 6 is also included, wherein the outer clamp 6 is clamped around the periphery of the metal tubular material 10, and a cooling water channel 61 is provided on the outer clamp 6.

[0043] The outer clamp 6 is also provided with an interconnected water channel 62 that is connected to the cooling water channel 61. The interconnected water channel 62 and the cooling water channel 61 are distributed alternately.

[0044] By providing an outer clamp 6 for holding the outer wall of the metal tubular material 10, in specific implementation, the outer clamp 6 plays an auxiliary clamping role, increasing the stability of the inner expansion valve 3 in holding the metal tubular material 10. Simultaneously, the outer clamp 6 also has a conductive heating device for conductively heating the metal tubular material 10. By providing a cooling water channel 61 on the outer clamp 6, cooling water circulates after the conductive heating treatment, enabling rapid cooling of the surface of the metal tubular material 10.

[0045] The working principle of this utility model is described below:

[0046] Equipped with two end clamps as described in this application, when clamping the metal tubular material 10, the two sealed ends 1 are respectively located at both ends of the metal tubular material 10. The rotating shaft 2 and the inner expansion valve 3 are simultaneously inserted into the metal tubular material 10, and the rotating shaft 2 is driven to rotate, completing the clamping process of the metal tubular material 10. Then, by supplying air to each air pipe passing through the air inlet 11 and the air hole 41, the metal tubular material 10 is inflated. At the same time, the outer clamp 6 clamps the outer wall of the metal tubular material 10, increasing the clamping effect. By energizing the conductive heating device equipped on the outer clamp 6, the metal tubular material 10 is electrically heated. After the conductive heating process is completed, cooling water is circulated in the cooling water channel 61 for rapid cooling of the surface of the metal tubular material 10.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A conductive heating end clamp formed by hot stamping of a metal tube by gas expansion, characterized in that: It includes a sealing end (1), a rotating shaft (2), an inner expansion valve (3), a conical nut (4), and an outer expansion sealing ring (5), wherein, The rotating shaft (2) is rotatably mounted on the sealing end (1) and is used to be inserted into the middle position of the inner cavity of the metal tubular material (10); An inner expansion valve (3) is rotatably disposed on one side of the sealing end (1) for inserting the metal tubular material (10). The rotating shaft (2) is located inside the inner expansion valve (3), and a deformable gap is formed on the inner expansion valve (3). The sealing end (1) blocks the deformable gap on the inner expansion valve (3). A conical nut (4) is threaded onto the rotating shaft (2), and an air hole (41) through which an air supply pipe passes is provided on the conical nut (4). The inner wall of the inner expansion valve (3) includes a fitting wall (33), and the conical nut (4) fits against the fitting wall (33). An external expansion sealing ring (5) is disposed on the periphery of the internal expansion valve (3) for sealing and fitting against the inner wall of the metal tubular material (10).

2. The conductive heating end clamp formed by hot stamping of a metal tube by gas expansion as described in claim 1, characterized in that: The rotating shaft (2) has a left-hand thread (21) and a right-hand thread (22). There are two conical nuts (4). The two conical nuts (4) are threadedly connected to the left-hand thread (21) and the right-hand thread (22) respectively. The inner expansion valve (3) includes two fitting walls (33) that fit with the two conical nuts (4).

3. The conductive heating end clamp formed by hot stamping of a metal tube by gas expansion as described in claim 2, characterized in that: The internal expansion valve (3) includes a left pressing part (31) and a right pressing part (32), and the two fitting walls (33) are respectively formed at the connection between the left pressing part (31) and the right pressing part (32).

4. The conductive heating end clamp formed by hot stamping of a metal tube as described in claim 1, characterized in that: The conical nut (4) has multiple air holes (41) and the multiple air holes (41) are circumferentially equidistant.

5. The conductive heating end clamp formed by hot stamping of a metal tube as described in claim 4, characterized in that: The sealing end (1) has an air inlet (11) through which the air supply pipe passes, and the sum of the diameters of the multiple air holes (41) on the conical nut (4) is smaller than the diameter of the air inlet (11).

6. The conductive heating end clamp formed by hot stamping of a metal tube by gas expansion as described in claim 1, characterized in that: The number of the external expansion sealing rings (5) is three, and the three external expansion sealing rings (5) are arranged at equal intervals on the periphery of the internal expansion valve (3).

7. The conductive heating end clamp formed by hot stamping of a metal tube as described in claim 6, characterized in that: The external expansion sealing ring (5) is a metal sealing ring, and the three external expansion sealing rings (5) are located at both ends of the internal expansion valve (3) and the middle of the internal expansion valve (3), respectively.

8. The conductive heating end clamp formed by hot stamping of a metal tube by gas expansion as described in claim 1, characterized in that: The inner expansion valve (3) has a mounting ring groove (34) on its periphery, and the outer expansion sealing ring (5) is disposed inside the mounting ring groove (34).

9. The conductive heating end clamp formed by hot stamping of a metal tube as described in claim 1, characterized in that: It also includes an external clamp (6), wherein, The outer clamp (6) is clamped around the periphery of the metal tubular material (10), and a cooling water channel (61) is provided on the outer clamp (6).

10. The conductive heating end clamp formed by hot stamping of a metal tube as described in claim 9, characterized in that: The outer clamp (6) is also provided with an interconnected water channel (62) that communicates with the cooling water channel (61), and the interconnected water channel (62) and the cooling water channel (61) are distributed alternately.

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