Titanium alloy welding reversible deformation and gas protection integrated device and method

Abstract

The invention discloses a titanium alloy welding reversible deformation and gas protection integrated device and method.The device comprises a servo electric control cabinet, a supporting tread, an inert gas protection dragging cover, an inert gas protection dragging cover connector, an inner supporting movable mechanism, a transmission shaft, an auxiliary supporting component, a device base and a tread vernier scale; wherein the inner support moving mechanism mainly comprises a support arm, a radial sliding arm, a positioning block, an axial mounting plate, a tread framework and an end face support disc. During welding, the inner wall of the annular radiator is clamped in an internal tensioning mode, a protective gas dragging cover is arranged at the position to be welded, protective gas is continuously introduced into the protective gas dragging cover under the condition that the tensioning force is kept unchanged, then welding is carried out, introduction of the protective gas is stopped after welding is completed and the annular radiator is cooled to the normal temperature, and welding is completed. And disassembling the annular radiator. Gas protection and anti-shrinkage deformation can be completed at a time, and finally the stable welding process and quality control are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of welding technology, in particular to a welding method for titanium alloy products and a device for controlling workpiece deformation during welding and protecting the front and back sides of a weld with inert gas. Background Art

[0002] Titanium and titanium alloys have the characteristics of low density, high specific strength, and strong corrosion resistance, and have been widely used in the aerospace field. The raw material of the annular radiator is titanium alloy, and the overall structure is a cylindrical rotating body cavity. The product is mainly connected by various sheet metal parts and machined parts using welding technology. Since titanium and titanium alloys are more active in the hot state, when the various titanium and titanium alloy components are welded without protection, the parent material begins to absorb hydrogen at 200°C, oxygen at 400°C, and nitrogen at 600°C. The presence of elements such as hydrogen, oxygen, and nitrogen will make the weld brittle, so inert gas protection must be used during the product welding process. In addition, the various components that make up the annular radiator are all thin-walled parts, and the product has a cavity structure after assembly welding, and the product cannot be directly calibrated. Therefore, the current titanium alloy annular radiator welding mainly has the following problems:

[0003] 1) It is difficult to implement gas protection, and a dedicated person is required to blow gas for protection during welding. The annular radiator is a cylindrical structure as a whole. During welding, a special gas hood is required to protect the back of the weld from the inside of the cylinder. Due to the large welding area, a dedicated person needs to hold the gas protection hood for protection. That is, the handheld hood on the back needs to move to where the front welding gun moves. Since manual control is required, there are problems such as high labor intensity and unstable weld protection effect.

[0004] 2) Large deformation after welding affects the assembly of parts in the next process. Since the annular radiator is a thin-walled cavity structure, there is no effective support inside the welding process. The shrinkage after welding causes the cylinder area to show different degrees of deformation and bulging. The parts of the next process cannot be directly assembled. In addition, titanium alloy has high specific strength and low plasticity at room temperature, which makes it impossible to directly correct the shape of the product. It can only be finalized through heat treatment. When the welding deformation depth exceeds 8mm, two rounds of heat setting are required to eliminate the deformation, which directly increases the product manufacturing cycle and processing cost. In addition, after the same set of products are heat-set multiple times, the mechanical properties of the product base material will decrease.

[0005] In summary, in order to ensure the quality of gas protection on both sides of the weld when welding titanium alloy products, replace manual air blowing protection, and control the shrinkage and deformation during the welding process to avoid affecting the subsequent parts assembly, more efficient and stable semi-automatic integrated devices and welding measures are needed. Summary of the invention

[0006] The present invention aims to provide an integrated device and method for titanium alloy welding anti-deformation and gas protection, which can realize the protection of the front and back sides of the weld when welding a titanium alloy annular radiator, and at the same time has the function of supporting the annular radiator surface to control welding deformation, thereby realizing a stable welding process and quality control.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A titanium alloy welding anti-deformation and gas protection integrated device, comprising:

[0009] Device base;

[0010] A transmission shaft, wherein the transmission shaft is a ball screw, and at least two ball nuts are installed on the ball screw. The first end of the ball screw is connected to the output end of the servo motor, and the servo motor is fixed on the base of the device;

[0011] The inner supporting movable mechanism comprises a support arm, a radial sliding arm, a positioning block, an axial mounting plate, a tread frame and an end support plate, wherein two end support plates are installed at intervals on the ball screw and all ball nuts are located between the two end support plates, the first ends of the plurality of support arms are hinged at equal intervals on the circumferential surface of the ball nut, the second ends of the support arms are hinged to the first ends of the radial sliding arms, the axial mounting plate is arranged parallel to the ball screw, and its two ends are respectively connected to the two end support plates, and each two axial mounting plates are in a group, the two axial mounting plates in the group are arranged parallel and spaced, a plurality of positioning blocks are installed in parallel and spaced in the interval between the two axial mounting plates in the group, and each two positioning blocks are in a group, the radial sliding arm is slidably connected between the two positioning blocks in the same group, the second end of the radial sliding arm is connected to the inner surface of the tread frame, and the tread frame is a cylindrical frame;

[0012] A supporting tread, the inner surface of the supporting tread being mounted on the outer surface of the tread frame;

[0013] an auxiliary support member, wherein a first end of the auxiliary support member is connected to a second end of the ball screw, and a second end of the auxiliary support member is connected to a device base;

[0014] A tread vernier ruler, which is fixed on one end of the tread frame close to the auxiliary support member, and is used to read the outer diameter of the currently supported tread. The surface of the end support disc closest to the tread vernier ruler is provided with an outer diameter scale;

[0015] An inert gas protection hood is installed on the outer surface of the tread frame at a position corresponding to the weld on the part to be welded. The inert gas protection hood is a cavity shell. Ventilation holes are evenly opened on the surface of the shell corresponding to the weld of the part to be welded. The cavity of the shell is filled with steel wool. An inert gas protection hood joint is also provided on the shell.

[0016] Furthermore, a height-adjusting support foot is installed at the lower end of the device base.

[0017] Furthermore, the height adjustment support foot includes a foot pad, a screw and a rotating handle, wherein the screw is threadedly connected to the device base, and the upper and lower ends of the screw are respectively connected to the rotating handle and the foot pad.

[0018] As a solution:

[0019] The end surface support plate comprises a plate body and four radially extending connecting plates evenly distributed on the circumferential surface of the plate body;

[0020] The two ends of the axial mounting plate are respectively connected to the connecting plates of the two end surface support plates;

[0021] The radial sliding arm is T-shaped, wherein the vertical side corresponding to the T-shape is slidably connected between two positioning blocks in the same group, and the horizontal side corresponding to the T-shape is connected to the inner surface of the tread frame as the second end of the radial sliding arm.

[0022] As an option, a plurality of mounting holes with different spacings are provided along the length direction of the axial mounting plate, and the positioning blocks are installed at different mounting holes. This solution can adjust the connection position between the radial sliding arm and the tread frame. When the axial size of the annular radiator changes and the position of the radial sliding arm needs to be adjusted, or when the number of radial sliding arms needs to be increased, the adjustment is achieved by moving the position of the positioning block or increasing the number of positioning blocks.

[0023] Furthermore, the first end of the auxiliary support member is connected to the second end of the ball screw through a bearing.

[0024] As an option, the auxiliary support member includes a threaded sleeve and two screw rods respectively connected to two ends of the threaded sleeve, and the length of the auxiliary support member can be adjusted by the cooperation between the screw rod and the threaded sleeve.

[0025] A titanium alloy welding anti-deformation and gas protection integrated method comprises: clamping the inner wall of an annular radiator by an internal tensioning method, setting a protective gas hood at a position to be welded, continuously introducing protective gas into the protective gas hood while keeping the tensioning force unchanged, then welding is performed, and after the welding is completed and the annular radiator is cooled to room temperature, the introduction of protective gas is stopped, and the annular radiator is disassembled.

[0026] As an option, the aforementioned device is used to implement internal tensioning. First, the connection between the first end of the auxiliary support member and the second end of the ball screw is released, the inner wall of the annular radiator is sleeved on the supporting tread, and the servo motor is started to drive the transmission shaft to rotate, thereby driving the ball nut to perform axial linear motion, and the axial linear motion is converted into radial sliding of the radial sliding arm through the support arm, and finally the tread frame is pushed and the supporting tread and the inert gas protection hood are moved to fit the inner wall of the annular radiator, and then the protective gas is introduced into the inert gas protection hood through the inert gas protection hood joint.

[0027] Compared with the prior art, the titanium alloy welding anti-deformation and gas protection integrated device and method of the present invention solves the problems of difficulty in implementing protective gas during the current titanium alloy annular radiator welding, large deformation after welding and multiple heat setting required, resulting in decreased mechanical properties, and long manufacturing cycle and cost.

[0028] The device and method of the present invention are simple to operate when welding a titanium alloy annular radiator, and gas protection and anti-shrinkage deformation are completed at one time. Manual operation of protective gas and multiple heat setting treatments are no longer required, and a stable welding process and quality control are ultimately achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The front view of the titanium alloy welding anti-deformation and gas protection integrated device with a titanium alloy annular radiator installed;

[0030] Figure 2 for Figure 1 Right view of;

[0031] Figure 3 This is the axonometric diagram of the integrated device for anti-deformation and gas protection for titanium alloy welding;

[0032] Figure 4 for Figure 3 Another angle view of;

[0033] Figure 5 This is the front view of the integrated device for anti-deformation and gas protection for titanium alloy welding;

[0034] Figure 6 for Figure 5 Right view of;

[0035] Figure 7 It is the parts diagram of the inert gas protection drag hood;

[0036] Figure 8 This is the structural diagram of the internal support activity mechanism;

[0037] Fig. 9 This is the exploded diagram of the inner support movable mechanism;

[0038] In the figure: 1-servo electric control cabinet, 2-support tread, 3-inert gas protection hood, 4-inert gas protection hood joint, 5-inner support movable mechanism, 51-support arm, 52-radial sliding arm, 53-positioning block, 54-axial mounting plate, 55-tread frame, 56-end support plate, 6-transmission shaft, 7-auxiliary support member, 8-device base, 9-tread vernier scale. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0040] like Figures 2 to 9 As shown, the titanium alloy welding anti-deformation and gas protection integrated device designed for the present invention includes a servo electric control cabinet 1, a supporting tread 2, an inert gas protection hood 3, an inert gas protection hood joint 4, an inner supporting movable mechanism 5, a transmission shaft 6, an auxiliary supporting member 7, a device base 8 and a tread vernier 9, wherein the inner supporting movable mechanism 5 is mainly composed of a support arm 51, a radial sliding arm 52, a positioning block 53, an axial mounting plate 54, a tread frame 55 and an end support plate 56.

[0041] A height adjustment foot is installed at the lower end of the device base 8, and the height adjustment foot includes a foot pad, a screw and a rotating handle, wherein the screw is threadedly connected to the device base 8, and the upper and lower ends of the screw are respectively connected to the rotating handle and the foot pad.

[0042] The transmission shaft 6 is a ball screw, on which two ball nuts are installed. The first end of the ball screw is connected to the output end of the servo motor. The servo motor is fixed on the device base 8 and integrated with the servo electric control cabinet 1.

[0043] like Figure 8 and Fig. 9As shown, the inner support movable mechanism 5 includes 8 support arms 51, 8 radial sliding arms 52, 16 positioning blocks 53, 8 axial mounting plates 54, 4 tread skeletons 55 and two end surface support plates 56, wherein the two end surface support plates 56 are installed on the ball screw at intervals and all the ball nuts are located between the two end surface support plates 56, the first end of each support arm 51 is hinged to the circumferential surface of the ball nut at equal intervals, the second end of the support arm 51 is hinged to the first end of the radial sliding arm 52, the axial mounting plate 54 is arranged parallel to the ball screw, and its two ends are respectively connected to the two end surface support plates 56, and every two axial mounting plates 54 are grouped together, the two axial mounting plates 54 in the group are arranged in parallel and at intervals, and the four positioning blocks 53 are installed in parallel and at intervals between the two axial mounting plates 54 in the group. The radial sliding arm 52 is slidably connected between the two positioning blocks 53 in the same group, and the second end of the radial sliding arm 52 is connected to the inner surface of the tread skeleton 55, which is a cylindrical frame; the end support plate 56 includes a plate body and four radially extending connecting plates evenly distributed on the circumferential surface of the plate body; the two ends of the axial mounting plate 54 are respectively connected to the connecting plates of the two end support plates 56; the radial sliding arm 52 is T-shaped, wherein the vertical side corresponding to the T-shape is slidably connected between the two positioning blocks 53 in the same group, wherein the horizontal side corresponding to the T-shape is connected to the inner surface of the tread skeleton 55 as the second end of the radial sliding arm 52, and a plurality of mounting holes with different spacings are arranged along the length direction of the axial mounting plate 54, and the positioning blocks 53 are installed at different mounting holes.

[0044] like Figure 3 and Figure 4 There are four supporting treads 2, and the inner surface of each of them is mounted on the outer surface of the tread frame 55. Three inert gas protection hoods 3 are embedded in the area of ​​one supporting tread 2, and the shape and size of the inert gas protection hoods 3 are determined according to the shape of the weld.

[0045] like Figure 4 The first end of the auxiliary support member 7 is connected to the second end of the ball screw through a bearing, and the second end of the auxiliary support member 7 is connected to the device base 8; the auxiliary support member 7 includes a threaded sleeve and two screws respectively connected to the two ends of the threaded sleeve. The length adjustment of the auxiliary support member 7 is achieved through the cooperation (relative rotation) of the screw and the threaded sleeve. A handle is provided on the surface of the threaded sleeve to facilitate the rotation operation.

[0046] like Figure 3 and Figure 4, four tread vernier scales 9 are respectively fixed on one end of the tread frame 55 close to the auxiliary support member 7. The tread vernier scale 9 is used to indicate the diameter size of the supporting tread 2. Its first end is fixed on the tread frame 55, and the second end is parallel to the plate body of the end support disk 56. There is a scale on the connecting plate of the end support disk 56. The scale is read through the second end of the tread vernier scale 9 as the outer diameter size of the supporting tread 2 in the current state.

[0047] like Figure 1 , Figure 2 , Figure 4 and Figure 7 As shown, the inert gas protection hood 3 is installed on the outer surface of the tread frame 55 at the position corresponding to the weld on the part to be welded (i.e. Figure 1 The inert gas protection hood 3 is a cavity shell, and the surface of the shell corresponding to the weld of the parts to be welded is evenly provided with vent holes, the cavity of the shell is filled with steel wool, and an inert gas protection hood joint 4 is also provided on the shell.

[0048] The method for welding a titanium alloy annular radiator using a titanium alloy welding anti-deformation and gas protection integrated device is as follows:

[0049] 1) Assembly preparation. Open the auxiliary support member 7 and observe that the size indicated by the tread vernier scale 9 should be smaller than the inner diameter of the titanium alloy annular radiator. If it is larger than the inner diameter of the titanium alloy annular radiator, it is necessary to adjust the outer diameter of the support tread 2 to be smaller than the inner diameter of the titanium alloy annular radiator to ensure that the titanium alloy annular radiator can be normally installed. Figure 1 and Figure 2 , showing the titanium alloy ring radiator installed on the device;

[0050] 2) Assemble and weld the titanium alloy annular radiator. Assemble the titanium alloy annular radiator to the support tread 2, adjust the assembly position of the titanium alloy annular radiator to the left, right, front and back, ensure that the welding part of the titanium alloy annular radiator is completely placed in the inert gas protection hood 3 area, and reconnect the auxiliary support member 7 to the transmission shaft 6.

[0051] 3) Internal support to tighten the titanium alloy annular radiator. Start the servo electric control cabinet 1, and the servo motor in the control cabinet drives the transmission shaft 6 to make linear motion. There are two ball nuts distributed on the transmission shaft 6, which will move forward and backward linearly with the rotation of the transmission shaft 6, thereby driving the internal support movable mechanism 5 to achieve external tension support or internal contraction separation, so as to increase or reduce the diameter of the support tread 2, where the size indicated by the tread vernier ruler 9 is the outer diameter size of the support tread 2. When in use, after adjusting the support tread to a predetermined size, the servo electric control cabinet 1 is powered off, the transmission shaft 6 stops moving, and the internal support movable member 5 immediately stops moving and remains fixed, so as to achieve internal tension support of the support tread 2 on the titanium alloy annular radiator;

[0052] 4) Connect the inert gas. Connect the inert gas hoses to the inert gas shield connectors 4. The shielding gas enters the inner cavity of the titanium alloy annular radiator through the inert gas shield 3 (the inert gas shield 3 has a porous plate or mesh, and there is steel wool inside to evenly disperse the shielding gas flow). Open the inert gas valve, and start welding after continuous ventilation for 5 minutes.

[0053] 5) Complete welding. For the titanium alloy annular radiator to be welded ( Figure 1 The welding is carried out with a central nozzle and a gas collecting hood. Inert protective gas is continuously introduced during the welding process. After the welding is completed, the base material of the weld and the heat-affected zone must continue to be supplied with inert protective gas in a hot state.

[0054] 6) Take out the titanium alloy annular radiator. After the welding is completed and the titanium alloy annular radiator is cooled to room temperature, turn off the inert protective gas. Start the servo electric control cabinet 1 to drive the transmission shaft 6 to make linear motion. At the same time, the inner supporting movable mechanism 5 shrinks following the transmission shaft 6 (the ball screw rotates, the ball nut moves axially linearly, the support arm 51 swings relative to the ball nut, the radial sliding arm 52 moves radially linearly, the tread skeleton 55 moves radially linearly, and the support tread 2 moves radially linearly), thereby reducing the outer diameter of the support tread 2. Observe the size indication of the tread vernier scale 9. After the support tread 2 reaches the predetermined size, the servo electric control cabinet 1 will be powered off and stop shrinking the support tread 2 inward. The outer diameter of the support tread 2 is smaller than the inner diameter of the titanium alloy annular radiator. Then the titanium alloy annular radiator can be directly taken out, and the welding operation is completed.

[0055] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A titanium alloy welding anti-deformation and gas protection integrated device, characterized in that: include: Device base (8); A transmission shaft (6), wherein the transmission shaft (6) is a ball screw, and at least two ball nuts are mounted on the ball screw, and a first end of the ball screw is connected to an output end of a servo motor, and the servo motor is fixed on a device base (8); An inner support movable mechanism (5), the inner support movable mechanism (5) comprising a support arm (51), a radial sliding arm (52), a positioning block (53), an axial mounting plate (54), a tread frame (55) and an end surface support plate (56), wherein two end surface support plates (56) are installed on the ball screw at intervals so that all ball nuts are located between the two end surface support plates (56), the first ends of a plurality of support arms (51) are hinged to the circumferential surface of the ball nut at equal intervals, the second ends of the support arms (51) are hinged to the first ends of the radial sliding arms (52), the axial mounting plate (54) is hinged to the first ends of the radial sliding arms (52), and the tread frame (55) is hinged to the end surface of the ball nut. ) is arranged parallel to the ball screw, and its two ends are respectively connected to two end surface support plates (56), and every two axial mounting plates (54) form a group, and the two axial mounting plates (54) in the group are arranged in parallel and spaced apart, and a plurality of positioning blocks (53) are installed in parallel and spaced apart in the interval between the two axial mounting plates (54) in the group, and every two positioning blocks (53) form a group, and a radial sliding arm (52) is slidably connected between the two positioning blocks (53) in the same group, and the second end of the radial sliding arm (52) is connected to the inner surface of the tread frame (55), and the tread frame (55) is a cylindrical frame; A supporting tread (2), wherein the inner surface of the supporting tread (2) is mounted on the outer surface of the tread frame (55); an auxiliary support member (7), wherein a first end of the auxiliary support member (7) is connected to a second end of the ball screw, and a second end of the auxiliary support member (7) is connected to a device base (8); A tread vernier ruler (9), the tread vernier ruler (9) being fixed to one end of the tread frame (55) close to the auxiliary support member (7), the tread vernier ruler (9) being used to read the outer diameter of the currently supported tread (2), and an outer diameter scale being arranged on the surface of an end surface support disc (56) closest to the tread vernier ruler (9); An inert gas protection hood (3) is installed on the outer surface of the tread frame (55) at a position corresponding to the weld seam on the part to be welded. The inert gas protection hood (3) is a cavity shell. Ventilation holes are evenly opened on the surface of the shell corresponding to the weld seam of the part to be welded. The cavity of the shell is filled with steel wool. An inert gas protection hood joint (4) is also provided on the shell.

2. The titanium alloy welding anti-deformation and gas protection integrated device according to claim 1, characterized in that: A height adjustment foot is installed at the lower end of the device base (8).

3. The titanium alloy welding anti-deformation and gas protection integrated device according to claim 2, characterized in that: The height adjustment support foot comprises a foot pad, a screw rod and a rotating handle, wherein the screw rod is threadedly connected to the device base (8), and the upper and lower ends of the screw rod are respectively connected to the rotating handle and the foot pad.

4. The titanium alloy welding anti-deformation and gas protection integrated device according to claim 1, characterized in that: The end surface support disk (56) comprises a disk body and four radially extending connecting plates evenly distributed on the circumferential surface of the disk body; The two ends of the axial mounting plate (54) are respectively connected to the connecting plates of the two end surface supporting plates (56); The radial sliding arm (52) is T-shaped, wherein the vertical side corresponding to the T-shape is slidably connected between two positioning blocks (53) of the same group, and the horizontal side corresponding to the T-shape is connected to the inner surface of the tread frame (55) as the second end of the radial sliding arm (52).

5. The titanium alloy welding anti-deformation and gas protection integrated device according to claim 1, characterized in that: A plurality of mounting holes with different spacings are arranged along the length direction of the axial mounting plate (54), and the positioning blocks (53) are installed at different mounting holes.

6. The titanium alloy welding anti-deformation and gas protection integrated device according to claim 1, characterized in that: The first end of the auxiliary support member (7) is connected to the second end of the ball screw through a bearing.

7. The titanium alloy welding anti-deformation and gas protection integrated device according to claim 1, characterized in that: The auxiliary support member (7) comprises a threaded sleeve and two screw rods respectively connected to the two ends of the threaded sleeve, and the length of the auxiliary support member (7) can be adjusted by the cooperation between the screw rods and the threaded sleeve.

8. A titanium alloy welding anti-deformation and gas protection integrated method, characterized in that: include: The inner wall of the annular radiator is clamped by internal tensioning method, and a shielding gas hood is set at the welding position. Shielding gas is continuously introduced into the shielding gas hood while keeping the tensioning force unchanged, and then welding is carried out. After the welding is completed and the annular radiator is cooled to room temperature, the shielding gas is stopped and the annular radiator is disassembled.

9. The titanium alloy welding anti-deformation and gas protection integrated method according to claim 8, characterized in that: The internal tensioning is implemented by using the device described in claim 1. First, the connection between the first end of the auxiliary support member (7) and the second end of the ball screw is released, the inner wall of the annular radiator is sleeved on the support tread (2), the servo motor is started to drive the transmission shaft (6) to rotate, and then the ball nut is driven to make axial linear motion, and the axial linear motion is converted into radial sliding of the radial sliding arm (52) through the support arm (51), and finally the tread frame (55) is pushed and the support tread (2) and the inert gas protection hood (3) are moved to fit the inner wall of the annular radiator, and then the protective gas is introduced into the inert gas protection hood (3) through the inert gas protection hood joint (4).

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