Composite vibration diffusion welding method

Abstract

The invention provides a composite vibration diffusion welding method which comprises the following steps that a first to-be-welded part and a second to-be-welded part are prepared, the first to-be-welded part is provided with a first to-be-welded end, and the second to-be-welded part is provided with a second to-be-welded end; the first to-be-welded part and the second to-be-welded part are clamped and fixed to vibration welding equipment, so that the first to-be-welded end abuts against the second to-be-welded end and is aligned with the second to-be-welded end, and the first to-be-welded end and / or the second to-be-welded end are / is heated through a heating assembly; and when the first to-be-welded end and / or the second to-be-welded end are / is heated to the preset temperature, vibration welding equipment is started, vibration diffusion welding is conducted on the first to-be-welded part and the second to-be-welded part, and a welded joint is obtained. According to the method, the machining cost of the parts can be reduced, and the machining process can be simplified.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and more specifically to a composite vibration diffusion welding method. Background Art

[0002] Components that are currently welded using traditional diffusion welding require acid and alkali washing before diffusion welding to remove impurities or oxides on the end faces of the diffusion welded components. There are also strict requirements on the machining accuracy of the welding surface, and there are high requirements on the equipment of the diffusion furnace and the vacuum degree of the welding process.

[0003] In summary, the existing diffusion welding technology has high requirements for components, processes and equipment, which increases the cost of processing parts and increases the complexity of the process. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The technical problem to be solved by the present invention is that the existing diffusion welding technology has the problems of high parts processing cost and relatively complicated process.

[0006] (II) Technical solution

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] The present invention provides a composite vibration diffusion welding method, comprising the following steps:

[0009] Prepare a first workpiece to be welded and a second workpiece to be welded, wherein the first workpiece to be welded has a first end portion to be welded, and the second workpiece to be welded has a second end portion to be welded;

[0010] The first workpiece to be welded and the second workpiece to be welded are clamped and fixed on a vibration welding device so that the first end to be welded abuts against and is aligned with the second end to be welded, and the first end to be welded and / or the second end to be welded are heated by a heating assembly;

[0011] When the first end to be welded and / or the second end to be welded is heated to a preset temperature, the vibration welding equipment is started to perform vibration diffusion welding on the first workpiece to be welded and the second workpiece to be welded to obtain a welded joint.

[0012] Preferably, the first end to be welded and the second end to be welded have a mutually contacting welding interface, the heating component is an induction heating coil, and the middle position of the induction heating coil coincides with the welding interface.

[0013] Preferably, performing vibration diffusion welding on the first workpiece to be welded and the second workpiece to be welded to obtain a welded joint comprises the following steps:

[0014] The heating component heats the first end to be welded and / or the second end to be welded to a preset temperature and maintains the temperature for a first preset time;

[0015] driving the first workpiece to be welded to vibrate back and forth along a first direction so as to cause relative friction between the first workpiece to be welded and the second workpiece to be welded;

[0016] After the first workpiece to be welded has reciprocated and vibrated a preset number of times, an upsetting force is applied to the second workpiece to be welded along a second direction and maintained for a second preset time to obtain the weld joint, wherein the second direction is perpendicular to the end face to be welded of the first workpiece to be welded, and the second direction is perpendicular to the first direction.

[0017] Preferably, the first preset time is 5-8s.

[0018] Preferably, the preset number of times is 5-15 times.

[0019] Preferably, the first part to be welded is a first material, the second part to be welded is a second material, the first material is different from the second material, and the stiffness of the first material is greater than that of the second material. Before performing vibration diffusion welding, only the first end to be welded is heated to soften the first end to be welded so that the stiffness of the first end to be welded matches the stiffness of the second end to be welded.

[0020] Preferably, the first workpiece to be welded and the second workpiece to be welded are made of the same material, and before performing vibration diffusion welding, a heating component heats the first end portion to be welded and the second end portion to be welded simultaneously.

[0021] Preferably, the first workpiece to be welded and the second workpiece to be welded are both made of titanium alloy material, and the preset temperature is 800°C-1200°C.

[0022] (III) Beneficial effects

[0023] The above technical solution of the present invention has at least the following advantages:

[0024] 1. Compared with the traditional diffusion welding technology, this technology can soften the material by heating the first end to be welded and the second end to be welded before vibration diffusion welding, reduce the friction coefficient of the material end surface, and thus reduce the machining accuracy requirements of the surface roughness of the parts before welding, so as to reduce the processing cost of the parts; welding can be carried out in the air without the need for a vacuum furnace, which can reduce equipment requirements and can heat the parts locally without damaging the performance of the parent material.

[0025] 2. Compared with linear friction welding technology, linear friction welding does not require high frequencies (generally 25-50Hz) during welding. It only needs to rub against each other 5-15 times after heating is completed, which can reduce the vibration frequency to a few hertz, and can improve the alignment accuracy of the parts to be welded to a certain extent. The first and second parts to be welded are externally heated by the heating assembly, and the heat input of the entire welding system is increased by external heating, which can reduce the heat generation of the original welding system. The original method of connecting parts that required high-frequency vibration heat generation can be changed to several low-frequency vibrations to achieve effective connection of parts. In addition, due to auxiliary heating, the applied forging force can be reduced. In turn, the requirements for equipment can be reduced, and the procurement cost of equipment can be reduced.

[0026] 3. After the composite vibration diffusion welding method provided by the present invention is used for welding, the heating component can be directly used to perform local heat treatment of the joint online after welding, thereby simplifying the manufacturing process of the parts.

[0027] 4. When this method is used for welding and connecting dissimilar materials, the material with higher rigidity is heated and softened by the heating component to reduce the rigidity of the material. During welding, the rigidity of the two dissimilar materials is not much different, which helps to achieve effective connection between the dissimilar materials. At the same time, the strength of the two dissimilar materials is matched, and the extrusion of the material with lower rigidity is reduced, which can reduce the generation of flash during welding and improve material utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the process of the composite vibration diffusion welding method provided in an embodiment of the present invention.

[0030] Figure 2 It is a schematic structural diagram of a first workpiece to be welded, a second workpiece to be welded, and a heating assembly provided in an embodiment of the present invention.

[0031] The reference numerals in the figures are:

[0032] 1. First workpiece to be welded; 2. Second workpiece to be welded; 3. Heating assembly; 11. First end portion to be welded; 21. Second end portion to be welded. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly located on the other element or indirectly located on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0035] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention, and do not indicate that a device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating relative importance or indicating the number of technical features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The specific implementation of the present invention is described in more detail below in conjunction with specific embodiments:

[0037] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a composite vibration diffusion welding method, comprising the following steps:

[0038] Prepare a first workpiece 1 to be welded and a second workpiece 2 to be welded, wherein the first workpiece 1 to be welded has a first end portion 11 to be welded, and the second workpiece 2 to be welded has a second end portion 21 to be welded;

[0039] The first workpiece 1 to be welded and the second workpiece 2 to be welded are clamped and fixed on the vibration welding equipment, so that the first end 11 to be welded is abutted against the second end 21 to be welded, and the first end 11 to be welded is aligned with the second end 21 to be welded, and the first end 11 to be welded and / or the second end 21 to be welded are heated by the heating component 3; the first end 11 to be welded and the second end 21 to be welded are heated by the heating component 3, so that the material strength of the first end 11 to be welded and the second end 21 to be welded can be softened, thereby reducing the initial friction coefficient of vibration diffusion welding, making it easier to connect the first end 11 to be welded and the second end 21 to be welded, and at the same time, the processing accuracy requirement of the surface roughness of the parts before welding can be reduced.

[0040] When the first end portion 11 to be welded and / or the second end portion 21 to be welded is heated to a preset temperature, the vibration welding equipment is started to perform vibration diffusion welding on the first workpiece 1 to be welded and the second workpiece 2 to be welded to obtain a welded joint.

[0041] Preferably, the first end portion 11 to be welded and the second end portion 12 to be welded have a mutually contacting interface to be welded, and the heating component 3 is an induction heating coil, and the middle position of the induction heating coil coincides with the interface to be welded.

[0042] Preferably, performing vibration diffusion welding on the first workpiece 1 and the second workpiece 2 to be welded to obtain a welded joint comprises the following steps:

[0043] The heating component heats the first end portion to be welded 11 and / or the second end portion to be welded 21 to a preset temperature and maintains the temperature for a first preset time;

[0044] Driving the first workpiece to be welded 1 to vibrate back and forth along a first direction so as to cause relative friction between the first workpiece to be welded 1 and the second workpiece to be welded 2;

[0045] After the first workpiece to be welded 1 vibrates back and forth for a preset number of times, an upsetting force is applied to the second workpiece to be welded 1 along a second direction and maintained for a second preset time to obtain a welded joint, wherein the second direction is perpendicular to the end face to be welded of the first workpiece to be welded, and the second direction is perpendicular to the first direction.

[0046] Preferably, the first preset time is 5-8s.

[0047] Preferably, the preset number of times is 5-15 times. Compared with conventional linear friction welding, since the present embodiment performs external heating on the first workpiece 1 / the second workpiece 2 through a heating assembly, the heat input of the entire welding system is increased by external heating, thereby reducing the self-heating of the original welding system, so that the original method of connecting parts by high-frequency vibration heat generation can be changed to a method of effectively connecting parts by several low-frequency vibrations. In addition, the requirements for equipment can be reduced (generating high-frequency vibrations has high requirements for equipment), thereby reducing the procurement cost of equipment.

[0048] Preferably, the first workpiece 1 to be welded is a first material, and the second workpiece 2 to be welded is a second material. The first material is different from the second material, and the first material has a greater stiffness than the second material. Before performing vibration diffusion welding, only the first end 11 to be welded is heated and softened to make the stiffness of the first end 11 to be welded match the stiffness of the second end 21 to be welded. That is, the first workpiece 1 to be welded and the second workpiece 2 to be welded are dissimilar materials. When the method is used to weld dissimilar materials, the material with higher stiffness is heated and softened by the heating component to reduce the stiffness of the material. During welding, the stiffness of the two dissimilar materials is not much different, which helps to achieve effective connection between the dissimilar materials. At the same time, the strength of the two dissimilar materials is matched, and the extrusion of the material on the side with lower stiffness is reduced, which can reduce the generation of flash during welding and improve material utilization.

[0049] Preferably, the first workpiece to be welded 1 and the second workpiece to be welded 2 are made of the same material. Before performing the vibration diffusion welding, the heating assembly 3 heats the first end portion 11 to be welded and the second end portion 21 to be welded simultaneously.

[0050] Preferably, the first workpiece to be welded 1 and the second workpiece to be welded 2 are both made of titanium alloy material, and the preset temperature is 800°C-1200°C.

[0051] Taking a simplified hanging structure manufacturing method as an example, the composite vibration diffusion welding method includes the following steps:

[0052] 1) Pre-welding processing: processing the first workpiece 1 and the second workpiece 2 respectively;

[0053] 2) preparing an induction heating coil;

[0054] 3) The first workpiece to be welded 1 and the second workpiece to be welded 2 are respectively loaded into the fixture of the equipment (vibration welding equipment) with vibration upsetting function;

[0055] 4) fixing the induction heating coil at the interface between the first workpiece 1 and the second workpiece 2, with the middle position of the induction heating coil corresponding to the interface;

[0056] 5) Heat the first workpiece 1 and the second workpiece 2 to a set temperature and maintain the temperature for 5-8 seconds;

[0057] 6) The first workpiece to be welded 1 and the second workpiece to be welded 2 are rubbed against each other for 5-15 times, and a top forging force is applied at the same time, and maintained for a certain period of time;

[0058] 7) The pressure holding is completed and welding is completed.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite vibration diffusion welding method, characterized in that: The following steps are involved: Prepare a first workpiece to be welded and a second workpiece to be welded, wherein the first workpiece to be welded has a first end portion to be welded, and the second workpiece to be welded has a second end portion to be welded; The first workpiece to be welded and the second workpiece to be welded are clamped and fixed on a vibration welding device so that the first end to be welded abuts against and is aligned with the second end to be welded, and the first end to be welded and / or the second end to be welded are heated by a heating assembly; When the first end to be welded and / or the second end to be welded is heated to a preset temperature, the vibration welding equipment is started to perform vibration diffusion welding on the first workpiece to be welded and the second workpiece to be welded to obtain a welded joint.

2. The composite vibration diffusion welding method according to claim 1, characterized in that: The first end to be welded and the second end to be welded have a mutually contacting interface to be welded, and the heating component is an induction heating coil, and the middle position of the induction heating coil coincides with the interface to be welded.

3. The composite vibration diffusion welding method according to claim 1, characterized in that: Performing vibration diffusion welding on the first workpiece to be welded and the second workpiece to be welded to obtain a welded joint comprises the following steps: The heating component heats the first end to be welded and / or the second end to be welded to a preset temperature and maintains the temperature for a first preset time; driving the first workpiece to be welded to vibrate back and forth along a first direction so as to cause relative friction between the first workpiece to be welded and the second workpiece to be welded; After the first workpiece to be welded has reciprocated and vibrated a preset number of times, an upsetting force is applied to the second workpiece to be welded along a second direction and maintained for a second preset time to obtain the weld joint, wherein the second direction is perpendicular to the end face to be welded of the first workpiece to be welded, and the second direction is perpendicular to the first direction.

4. The composite vibration diffusion welding method according to claim 3, characterized in that: The first preset time is 5-8s.

5. The composite vibration diffusion welding method according to claim 3, characterized in that: The preset number of times is 5-15 times.

6. The composite vibration diffusion welding method according to claim 1, characterized in that: The first part to be welded is made of a first material, and the second part to be welded is made of a second material. The first material is different from the second material, and the first material has a stiffness greater than that of the second material. Before performing vibration diffusion welding, only the first end to be welded is heated to soften the first end to be welded so that the stiffness of the first end to be welded matches the stiffness of the second end to be welded.

7. The composite vibration diffusion welding method according to claim 1, characterized in that: The first workpiece to be welded and the second workpiece to be welded are made of the same material. Before performing vibration diffusion welding, a heating component heats the first end portion to be welded and the second end portion to be welded simultaneously.

8. The composite vibration diffusion welding method according to claim 1, characterized in that: The first workpiece to be welded and the second workpiece to be welded are both made of titanium alloy material, and the preset temperature is 800°C-1200°C.

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