Induction brazing heat dissipation protection tool for small-pipe-diameter thin-walled pipe

Abstract

The invention relates to the technical field of tools, in particular to a small-pipe-diameter thin-walled pipe induction brazing heat dissipation protection tool which comprises a tool body, heat dissipation holes used for guiding out heat are formed in the upper portion of the tool body, and a protection head used for being inserted into a to-be-welded thin-walled pipe is arranged on the lower portion of the tool body. The outer wall face of the protection head abuts against the inner wall of a thin-walled pipe to be welded, a positioning part used for containing a pipe joint is arranged between the outer side wall of the protection head and the tool body, and the problems that in the induction brazing process of the small-pipe-diameter thin-walled pipe fitting, heat is concentrated, the oxidation color exceeds the standard, and spot corrosion is caused are solved. And the overall welding quality and efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of tooling, and in particular to a heat dissipation protection tooling for induction brazing of small-diameter thin-walled tubes. Background Art

[0002] Induction brazing is an efficient and stable brazing technology with many advantages such as high efficiency, stability, low consumption, environmental protection and easy automation. It can achieve effective welding of non-ferrous metals such as aluminum, magnesium, copper and their alloys, and is widely used in many industries such as aerospace, rail transportation, etc. The heat required for induction brazing mainly comes from the induced magnetic field generated by the workpiece to be welded and the high-frequency current in the induction coil, and then the induced current generated. The heat generated by the Joule effect after the workpiece to be welded is energized. The welding heat is directly related to the welding current and welding time, that is, "Q = I2RT". The welding nugget formed during the welding process first starts at the point-shaped contact point formed after the electrodes are pressed, and then expands to the entire electrode pressing and energizing area, and the welding process is completed quickly.

[0003] Since the welding heat generated instantaneously by induction brazing is concentrated and the heating rate is fast, the heat generated in a short time is relatively large, especially in the welding process of small-diameter thin-walled pipe fittings. The metal hose is made of a metal bellows as the inner tube. After the outer wall of the bellows is woven and fixed with a steel sleeve, it is connected together by induction brazing. Before induction brazing, the bellows and the joint are welded together by argon arc welding. After induction brazing, the superposition of welding heat causes the welding oxidation color of the pipe fittings to exceed the standard. In addition, the flux in the welding process is heated and splashed onto the pipe fittings, causing spot corrosion on the pipe fittings. Therefore, induction brazing has great process difficulty in the brazing of small-diameter thin-walled pipe fittings. Summary of the invention

[0004] The purpose of the present invention is to overcome the disadvantage of the prior art that the spot corrosion caused by the splash of flux during the brazing process of thin-walled pipes affects the product quality, and to provide a heat dissipation protection tool for induction brazing of small-diameter thin-walled pipes.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the present invention specifically adopts the following technical scheme: a small-diameter thin-walled tube induction brazing heat dissipation protection tooling, comprising a tooling body, the upper part of the tooling body is provided with heat dissipation holes for conducting heat, the lower part of the tooling body is provided with a protective head for being plugged into the inside of the thin-walled tube to be welded, the outer wall surface of the protective head abuts the inner wall of the thin-walled tube to be welded, and a positioning portion for accommodating a pipe joint is provided between the outer side wall of the protective head and the tooling body.

[0006] Furthermore, the tool body is cylindrical, and the middle position of the tool body is hollow.

[0007] Furthermore, the heat dissipation holes are arranged on the side walls of the tool body, and the heat dissipation holes are arranged transversely and pass through the middle position of the tool body.

[0008] Furthermore, the diameter of the positioning portion is smaller than the diameter of the tool body, and a chamfer for clamping the pipe joint is provided at the connection between the side wall of the tool body and the positioning portion.

[0009] Furthermore, a clamping ring protruding from the outer side surface is provided at the bottom of the pipe joint, and the distance between the clamping ring and the bottom of the pipe joint is 2-5 mm.

[0010] The beneficial effects of the embodiments of the present invention are as follows: the middle position of the tool body is designed to be hollow, which reduces the weight of the tool body, is conducive to the rapid conduction and dissipation of heat, and is also convenient for conducting the heat and smoke generated during the brazing process, thereby ensuring the heat dissipation effect and reducing the effect of the scorching air on the inner wall of the thin-walled tube to be welded. The separately arranged protective head can be replaced according to thin-walled tubes of different diameters, thereby improving the applicability of the tool body. When in use, the outer wall surface of the protective head is tightly attached to the inner wall of the thin-walled tube to be welded, thereby playing a protective role, effectively improving the welding defects such as overheating of the joints, excessive welding oxidation color, and oxidation color spot corrosion on the inner wall of the weld during the induction brazing of small-diameter thin-walled pipe fittings, greatly reducing the time and workload of post-welding process processing in production applications, and being able to achieve stable and efficient induction brazing of small-diameter thin-walled tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0012] Figure 2 It is a schematic diagram of the position structure of the wire mesh sleeve pipe joint of the present invention;

[0013] Figure 3 It is a schematic diagram of the structure of the pipe sleeve during welding of the present invention;

[0014] In the figure: 1. tool body; 101. heat dissipation hole; 2. pipe joint; 3. protective head; 4. positioning part; 5. metal bellows; 501. wire mesh sleeve; 502. pipe sleeve. DETAILED DESCRIPTION

[0015] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0016] See also Figures 1 to 3The embodiment of the present invention discloses a heat dissipation protection tool for induction brazing of small-diameter thin-walled tubes, which mainly includes a tool body 1 and heat dissipation holes 101 arranged on the tool body 1, a protective head 3 and a positioning part 4. The tool body 1 is mainly used for positioning and heat extraction. The tool body 1 is designed to be cylindrical so as to match with standard small-diameter thin-walled pipe fittings. Correspondingly, a handle can be installed on the tool body 1 to facilitate positioning and operation during induction brazing. The middle position of the tool body 1 is designed to be hollow, which reduces the weight of the tool, is conducive to the rapid conduction and dissipation of heat, and is also convenient for extracting the heat and smoke generated during the brazing process, ensuring the heat dissipation effect, while reducing the effect of hot air on the inner wall of the thin-walled tube to be welded, thereby improving product quality.

[0017] A heat dissipation hole 101 is horizontally arranged on the side wall of the tool body 1. The heat dissipation hole 101 runs through the middle position of the tool body 1. There are multiple heat dissipation holes 101. During use, inert gas will be filled into the thin-walled tube to be processed. There are multiple heat dissipation holes 101, which can effectively conduct away the heat generated during the welding process, prevent excessive heat accumulation from causing excessive oxidation color of the pipe fittings, increase the heat conduction amount, and ensure that the heat can be quickly and evenly dissipated through the channel, thereby reducing the temperature of the pipe fittings and reducing the possibility of oxidation reactions.

[0018] In order to be applicable to the welding of thin-walled pipes, a protective head 3 for plugging into the inside of the thin-walled pipe is provided at the lower part of the tool body 1. The protective head 3 can be provided integrally with the tool body 1 or separately. The protective head 3 provided separately can be replaced according to thin-walled pipes of different diameters, thereby improving the applicable effect of the tool body 1. When in use, the outer wall surface of the protective head 3 closely fits the inner wall of the thin-walled pipe to be welded, thereby playing a protective role. Taking the welding of the metal bellows 5 as an example, the pipe joint 2 needs to be welded on the top of the metal bellows 5, the steel wire mesh sleeve 501 needs to be welded on the outside of the metal bellows 5, and the pipe sleeve 502 needs to be welded on the outside of the steel wire mesh sleeve 501. When in use, the protective head 3 is directly inserted into the inside of the metal bellows 5 and fits with the inner wall of the metal bellows 5. The protective head 3 separates the connection between the metal bellows 5 and the pipe joint 2, thereby effectively isolating the inner wall of the thin-walled pipe from external impurities and flux splashes, and also buffering the direct impact of welding heat on the inner wall of the pipe fitting to a certain extent, thereby reducing the risk of spot corrosion and improving the processing effect.

[0019] A positioning portion 4 is designed between the outer wall of the protective head 3 and the tool body 1 for accurately clamping the pipe joint 2. The diameter of the positioning portion 4 is slightly smaller than the diameter of the tool body 1, ensuring that the pipe joint 2 can be firmly installed in the predetermined position. At the same time, a chamfer is provided at the connection between the side wall of the tool body 1 and the positioning portion 4, which facilitates the smooth clamping of the pipe joint 2, realizes accurate positioning of the lower part of the protective head 3 inside the thin-walled pipe, and improves the assembly efficiency and accuracy of the tool.

[0020] In order to further enhance the stability and reliability of the tooling, a clamping ring protruding from the outer side is designed at the bottom of the pipe joint 2, and the distance between the clamping ring and the bottom of the pipe joint 2 is 2-5mm. The gap between the bottom of the clamping ring and the wire mesh sleeve 501 provides space for welding to ensure the welding effect, and the protruding clamping ring abuts against the inner wall of the wire mesh sleeve 501, which fixes the positions of the pipe joint 2, the metal bellows 5 and the wire mesh sleeve 501 to a certain extent. The wire mesh sleeve 501 is flush with the pipe sleeve 502, and flux is placed on the upper part of the clamping ring. When induction brazing is performed, the welding equipment is started, and the high-frequency current and the induction magnetic field generated by the induction coil are used to generate the welding flux. The field excites the induced current inside the pipe fitting, generates the heat required for the Joule effect, and completes the welding synchronously, which not only ensures the close fit between the pipe joint 2 and the positioning part 4, but also avoids the damage of the pipe fitting caused by too tight clamping. After the welding is completed, the tool body 1 is pulled out from the inside to complete the welding of the entire component, which effectively improves the welding defects such as joint overheating, excessive welding oxidation color, and oxidation color spot corrosion on the inner wall of the weld during the induction brazing of small-diameter thin-walled pipe fittings. In production applications, the time and workload of post-welding process processing are greatly reduced, and stable and efficient induction brazing of small-diameter thin-walled pipes can be achieved, which is suitable for high-end manufacturing fields such as aerospace, rail transportation, etc.

[0021] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0022] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0024] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A heat dissipation protection tool for induction brazing of small-diameter thin-walled tubes, characterized in that: The tool body (1) comprises a tool body (1), the upper part of which is provided with a heat dissipation hole (101) for dissipating heat, the lower part of which is provided with a protective head (3) for being plugged into the inside of a thin-walled tube to be welded, the outer wall surface of the protective head (3) abuts against the inner wall of the thin-walled tube to be welded, and a positioning portion (4) for accommodating a pipe joint (2) is provided between the outer wall of the protective head (3) and the tool body (1).

2. The heat dissipation protection tool for induction brazing of small-diameter thin-walled tubes according to claim 1 is characterized by: The tool body (1) is cylindrical, and the middle portion of the tool body (1) is hollow.

3. The heat dissipation protection tool for induction brazing of small-diameter thin-walled tubes according to claim 2 is characterized in that: The heat dissipation hole (101) is arranged on the side wall of the tool body (1), and the heat dissipation hole (101) is arranged transversely and passes through the middle position of the tool body (1).

4. The heat dissipation protection tool for induction brazing of small-diameter thin-walled tubes according to claim 1 is characterized by: The diameter of the positioning portion (4) is smaller than the diameter of the tool body (1), and a chamfer for clamping the pipe joint (2) is provided at the connection between the side wall of the tool body (1) and the positioning portion (4).

5. The heat dissipation protection tool for induction brazing of small-diameter thin-walled tubes according to claim 1 is characterized in that: The bottom of the pipe joint (2) is provided with a clamping ring protruding from the outer side surface, and the distance between the clamping ring and the bottom of the pipe joint (2) is 2-5 mm.

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