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

Abstract

The application discloses a titanium alloy welding reverse deformation and gas protection integrated device and method, and belongs to the technical field of welding equipment. The device comprises a servo electric control cabinet, a supporting tread, an inert gas protection drag cover, an inert gas protection drag cover joint, an inner supporting movable mechanism, a transmission shaft, an auxiliary supporting component, a device base and a tread vernier. The inner supporting movable mechanism is mainly composed of a supporting arm, a radial sliding arm, a positioning block, an axial mounting plate, a tread framework and an end face supporting disc. When welding, the inner wall of the annular radiator is clamped by using an inner expansion tightening mode, a protection gas drag cover is arranged at a position to be welded, protection gas is continuously introduced into the protection gas drag cover under the condition that the expansion tightening force is unchanged, then welding is implemented, the protection gas is stopped from being introduced after the welding is completed and the annular radiator is cooled to normal temperature, and the annular radiator is disassembled. The application can complete gas protection and reverse shrinkage deformation at one time, and finally realizes a stable welding process and quality control.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of welding process, in particular to a welding method for titanium alloy products and a device for controlling workpiece deformation and protecting the front and back of the weld seam using inert gas during the welding process. BACKGROUND

[0002] Titanium and titanium alloy have the characteristics of small density, high specific strength, strong corrosion resistance, etc., and have been widely used in the field of aerospace. The raw material of the annular radiator is titanium alloy, and the whole is a cylindrical rotary cavity structure. The product is mainly connected by welding process of various sheet metal parts and machined parts. Since titanium and titanium alloy are more active at high temperature, the base material starts to absorb hydrogen at 200℃, oxygen at 400℃, and nitrogen at 600℃ without protection during the welding of various titanium and titanium alloy components. The presence of hydrogen, oxygen and nitrogen will make the weld brittle, so inert gas protection must be used during the welding process of the product. In addition, each component of the annular radiator is a thin-walled part, and the product is a cavity structure after assembly, so it cannot be directly shaped, and therefore the following problems exist during the welding of the current titanium alloy annular radiator:

[0003] 1) It is difficult to implement gas protection, and a dedicated person is needed to blow gas protection during welding. The annular radiator is a cylindrical structure, and a special gas cover needs to be made to protect the back of the weld from the inside of the cylinder. Since the welding area is large, a dedicated person needs to hold the gas protection cover to implement protection, that is, the front welding gun needs to be moved to where the back hand-held cover needs to be moved to that place. Since it needs to be controlled manually, it has the problems of high labor intensity, unstable weld protection effect, etc.

[0004] 2) Large deformation after welding, affecting the assembly of the next process part. Since the annular radiator is a thin-walled cavity structure, there is no effective support inside during the welding process, and the shrinkage after welding causes the cylinder area to deform and bulge to varying degrees, so the next process part cannot be directly assembled. Titanium alloy has high specific strength and low plasticity at room temperature, which makes it difficult to directly shape the product. Only through heat treatment can the product be shaped, and when the welding deformation depth exceeds 8mm, two rounds of heat setting are needed to eliminate the deformation, which directly increases the product manufacturing cycle and processing cost, and the same set of products after multiple heating and setting will cause the mechanical properties of the product base material to decrease.

[0005] In summary, in order to ensure the quality of gas protection of the front and back of the weld seam during the welding of titanium alloy products, replace manual gas blowing protection, control the shrinkage deformation during the welding process, and avoid affecting the assembly of subsequent parts, more efficient and more stable semi-automatic integrated devices and welding measures need to be taken. SUMMARY

[0006] The application aims to provide a titanium alloy welding reverse deformation and gas protection integrated device and method, which can realize the protection of the front and back surfaces of the weld when the titanium alloy annular radiator is welded, has the function of supporting the annular radiator profile to control the welding deformation, and thus realizes the stable welding process and quality control.

[0007] To achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0008] A titanium alloy welding reverse deformation and gas protection integrated device comprises:

[0009] A device base;

[0010] A transmission shaft, which is a ball screw, has at least two ball nuts installed thereon, and has a first end connected with an output end of a servo motor, and the servo motor is fixed on the device base;

[0011] An inner support movable mechanism, which comprises a support arm, a radial sliding arm, a positioning block, an axial mounting plate, a tread skeleton and an end face support disc, wherein two end face support discs are spaced apart and installed on the ball screw and all the ball nuts are located between the two end face support discs, the first ends of a plurality of support arms are hingedly connected to the circumferential surface of the ball nut at equal intervals, the second ends of the support arms are hingedly connected to the first ends of the radial sliding arm, the axial mounting plate is arranged parallel to the ball screw, the two ends of the axial mounting plate are connected to the two end face support discs, respectively, and every two axial mounting plates form a group, the two axial mounting plates in the group are arranged in parallel and at intervals, a plurality of positioning blocks are installed in parallel and at intervals in the interval between the two axial mounting plates in the group, and every two positioning blocks form a group, the radial sliding arm is slidingly 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 skeleton, and the tread skeleton is a cylindrical frame;

[0012] A support tread, the inner surface of which is installed on the outer surface of the tread skeleton;

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

[0014] A tread vernier, which is fixed on the tread skeleton near one end of the auxiliary support member, is used for reading the outer diameter of the current support tread, and the surface of the end face support disc closest to the tread vernier is provided with an outer diameter scale;

[0015] An inert gas protection drag cover, which is installed on the outer surface of the tread skeleton corresponding to the position of the weld on the to-be-welded part, is a cavity shell, the surface of the shell corresponding to the weld of the to-be-welded part is uniformly provided with air holes, the cavity of the shell is filled with steel wool, and the shell is further provided with an inert gas protection drag cover connector.

[0016] Further, the device base lower end is provided with a height adjustment foot.

[0017] Further, the height adjustment foot comprises a foot pad, a screw rod and a rotating handle, wherein the screw rod is threadedly connected with the device base, and the upper and lower ends of the screw rod are connected with the rotating handle and the foot pad respectively.

[0018] As an option:

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

[0020] The two ends of the axial mounting plate are connected with the connecting plates of the two end face support discs respectively.

[0021] The radial sliding arm is T-shaped, wherein the vertical side of the T-shaped slidingly connects between the two positioning blocks in the same group, and the horizontal side of the T-shaped is connected with the inner surface of the tread skeleton as the second end of the radial sliding arm.

[0022] As an option, a plurality of mounting holes with different spacings are arranged along the length direction of the axial mounting plate, and the positioning blocks are mounted at different mounting holes. This option can adjust the connection position between the radial sliding arm and the tread skeleton. 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 position of the positioning block is moved or the number of positioning blocks is increased to achieve the adjustment.

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

[0024] As an option, the auxiliary support member comprises a threaded sleeve and two screw rods connected with the two ends of the threaded sleeve respectively, and the length adjustment of the auxiliary support member is realized through the cooperation of the screw rods and the threaded sleeve.

[0025] A titanium alloy welding reverse deformation and gas protection integrated method, comprising: clamping the inner wall of the annular radiator in an inner tensioning manner, setting a protective gas drag cover at the position to be welded, continuously introducing protective gas into the protective gas drag cover while keeping the tensioning force unchanged, then performing welding, stopping the introduction of protective gas after the welding is completed and the annular radiator is cooled to room temperature, and disassembling the annular radiator.

[0026] As an alternative, the inner tensioning is carried out by means of the aforementioned device, first, the auxiliary support member first end and the ball screw second end are disconnected, the inner wall of the annular radiator is sleeved on the support tread, the servo motor is started to drive the transmission shaft to rotate, then the axial linear motion of the ball nut is driven, and the axial linear motion is converted into the radial sliding of the radial sliding arm through the support arm, finally the tread framework is pushed and the support tread and the inert gas protection drag cover are moved to the inner wall of the annular radiator, and the inert gas protection drag cover connector is connected to the inert gas protection drag cover to input the protective gas.

[0027] Compared with the prior art, the titanium alloy welding reverse deformation and gas protection integrated device and method solve the problems of large difficulty in implementing protective gas during welding of the titanium alloy annular radiator, large deformation after welding, multiple heat setting leading to mechanical property decline, and large manufacturing cycle and cost.

[0028] The device and method are used for welding the titanium alloy annular radiator, simple operation, one-time gas protection and reverse shrinkage deformation, no need for manual operation of the protective gas and no need for multiple heat setting treatment, and finally stable welding process and quality control are realized. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a front view of the titanium alloy welding reverse deformation and gas protection integrated device installed with the titanium alloy annular radiator.

[0030] Figure 2 It is a right view of the titanium alloy welding reverse deformation and gas protection integrated device. Figure 1

[0031] Figure 3 It is an axonometric view of the titanium alloy welding reverse deformation and gas protection integrated device.

[0032] Figure 4 It is another angle view of the titanium alloy welding reverse deformation and gas protection integrated device. Figure 3

[0033] Figure 5 It is a front view of the titanium alloy welding reverse deformation and gas protection integrated device.

[0034] Figure 6 It is a right view of the titanium alloy welding reverse deformation and gas protection integrated device. Figure 5

[0035] Figure 7 It is a part drawing of the inert gas protection drag cover.

[0036] Figure 8 It is a structure drawing of the inner support movable mechanism.

[0037] Figure 9 It is an exploded view 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 with reference to the accompanying drawings and specific embodiments. However, 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 technical ideas of the present invention, various modifications, substitutions and changes made according to 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 by the present invention includes a servo electric control cabinet 1, a support tread 2, an inert gas protection hood 3, an inert gas protection hood joint 4, an internal support movable mechanism 5, a transmission shaft 6, an auxiliary support member 7, a device base 8 and a tread vernier 9, wherein the internal support 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 face 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 Figure 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 face support discs 56. The two end face support discs 56 are spaced apart mounted on the ball screw and all the ball nuts are located between the two end face support discs 56. The first end of each support arm 51 is equally spaced hinged to the circumferential surface of the ball nut, the second end of the support arm 51 is hinged to the first end of the radial sliding arm 52. The axial mounting plates 54 are arranged parallel to the ball screw, and the two ends of each axial mounting plate 54 are connected to the two end face support discs 56 respectively. 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. Four positioning blocks 53 are installed in parallel and spaced apart in the space between the two axial mounting plates 54 in the group, and two positioning blocks 53 form a group. The radial sliding arm 52 is slidingly connected between the two positioning blocks 53 in the same group. The second end of the radial sliding arm 52 is connected to the inner surface of the tread skeleton 55. The tread skeleton 55 is a cylindrical frame. The end face support disc 56 includes a disc body and four radially extending connecting plates evenly distributed on the circumferential surface of the disc body. The two ends of the axial mounting plate 54 are connected to the connecting plates of the two end face support discs 56 respectively. The radial sliding arm 52 is T-shaped, and the vertical side corresponding to the T shape is slidingly connected between the two positioning blocks 53 in the same group. 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. A plurality of mounting holes with different spacings are provided along the length direction of the axial mounting plate 54, and the positioning blocks 53 are installed at different mounting holes.

[0044] As shown in Figure 3 and Figure 4 , the four support treads 2 are installed on the outer surface of the tread skeleton 55. One area of the support tread 2 is embedded with three inert gas protection hoods 3. The shape and size of the inert gas protection hood 3 are determined according to the shape of the weld.

[0045] As shown in 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 screw rods connected to the two ends of the threaded sleeve respectively. The length adjustment of the auxiliary support member 7 is realized by the cooperation (relative rotation) of the screw rod and the threaded sleeve. A handle is provided on the surface of the threaded sleeve to facilitate rotation operation.

[0046] As shown in Figure 3 and Figure 4, 4 block of the tire tread vernier 9 is fixed on the tire tread skeleton 55 near the end of the auxiliary support member 7, the tire tread vernier 9 is used to indicate the diameter size of the support tire 2, its first end is fixed on the tire tread skeleton 55, and its second end is parallel to the disc body of the end face support disc 56, the connecting plate of the end face support disc 56 has a scale, and the scale is read through the second end of the tire tread vernier 9 as the outer diameter size of the support tire 2 in the current state.

[0047] As shown in Figure 1 , Figure 2 , Figure 4 and Figure 7 , the inert gas protection drag cover 3 is installed on the outer surface of the tire tread skeleton 55 at the position corresponding to the welding seam of the to-be-welded part (i.e. the position of the two nozzles of the annular radiator and the gas collecting cover in Figure 1 ), the inert gas protection drag cover 3 is a cavity shell, the surface of the shell corresponding to the welding seam of the to-be-welded part is uniformly provided with air holes, the cavity of the shell is filled with steel wool, and the shell is further provided with an inert gas protection drag cover connector 4.

[0048] The method for welding the titanium alloy annular radiator by using the titanium alloy welding reverse deformation and gas protection integrated device is as follows:

[0049] 1) Assembly work preparation. Open the auxiliary support member 7, and observe that the size indicated by the tire tread vernier 9 should be smaller than the inner diameter size of the titanium alloy annular radiator. If it is larger than the inner diameter size of the titanium alloy annular radiator, the outer diameter size of the support tire 2 needs to be adjusted to be smaller than the inner diameter of the titanium alloy annular radiator, so as to ensure that the titanium alloy annular radiator can be normally assembled, as shown in Figure 1 and Figure 2 , which show the state that the titanium alloy annular radiator is assembled on the device;

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

[0051] 3) Tighten the titanium alloy annular radiator by the inner support. Start the servo electric control cabinet 1, the servo motor in the control cabinet drives the transmission shaft 6 to move linearly, two ball nuts are distributed on the transmission shaft 6, and move linearly forward and backward with the rotation of the transmission shaft 6, and then drive the inner support movable mechanism 5 to realize the outer expansion support or the inner contraction separation, so as to realize the increase or decrease of the diameter of the support tire 2, wherein the size indicated by the tire tread vernier 9 is the outer diameter size of the support tire 2. When the support tire is adjusted to the predetermined size, the servo electric control cabinet 1 is powered off, the transmission shaft 6 stops moving, and the inner support movable mechanism 5 stops moving and remains fixed, so as to realize the inner expansion support of the support tire 2 to the titanium alloy annular radiator.

[0052] 4) Connect the inert shielding gas. Connect the inert gas hoses to the inert gas shielding hood connectors 4. The shielding gas enters the inner cavity of the titanium alloy annular radiator through the inert gas shielding hood 3 (the inert gas shielding hood 3 has a porous plate or mesh with steel wool inside to evenly disperse the shielding gas flow). Open the inert shielding gas valve and continue ventilation for 5 minutes before starting welding.

[0053] 5) Complete welding. For the titanium alloy annular radiator to be welded ( Figure 1 The welding is carried out with the middle nozzle and gas collecting hood. Inert shielding gas is continuously introduced during the welding process. After the welding is completed, the weld and the base material of the heat-affected zone must continue to be supplied with inert shielding 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, drive the transmission shaft 6 to make linear motion, and at the same time, the inner support 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 achieving a smaller outer diameter of the support tread 2, observing the size indication of the tread vernier caliper 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, and then the titanium alloy annular radiator can be directly taken out, and the welding operation is completed.

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

Claims

1. A titanium alloy welding reverse deformation and gas protection integrated device, characterized in that, The device base (8) is provided with a transmission shaft (6) which is a ball screw provided with at least two ball nuts, a first end of the ball screw being connected with an output end of a servo motor fixed on the device base (8). The inner support movable mechanism (5) comprises a support arm (51), a radial sliding arm (52), a positioning block (53), an axial mounting plate (54), a tread skeleton (55) and an end face support disc (56). The support tread (2) is arranged on the outer surface of the tread skeleton (55). The auxiliary support member (7) is connected with a second end of the ball screw and a second end of the device base (8). The tread vernier (9) is fixed on the tread skeleton (55) near the auxiliary support member (7) and is used for reading the outer diameter of the support tread (2). The inert gas protection drag cover (3) is arranged on the outer surface of the tread skeleton (55) corresponding to the position of the weld seam of the to-be-welded part. The device base (8) is provided with a height adjusting leg at a lower end. The height adjusting leg comprises a foot pad, a screw rod and a rotating handle.

2. The titanium alloy welding reverse deformation and gas protection integrated device according to claim 1, characterized in that:

4. The titanium alloy welding reverse deformation and gas protection integrated device according to claim 1 is characterized in that:

3. The titanium alloy welding strain-reversal and gas shielding integrated device of claim 2, wherein, The end face support disc (56) comprises a disc body and four radial extension connecting plates arranged on the circumferential surface of the disc body. The two ends of the axial mounting plate (54) are connected with the connecting plates of the two end face support discs (56). ​ ​ The radial sliding arm (52) is T-shaped, wherein the vertical side of the T shape is slidingly connected between two positioning blocks (53) in the same group, and the horizontal side of the T shape is connected to the inner surface of the tread skeleton (55) as the second end of the radial sliding arm (52).

5. The titanium alloy welding strain-reversal and gas shielding integrated device of claim 1, wherein: 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 mounted at different mounting holes.

6. The titanium alloy welding strain-reversal and gas shielding integrated device of claim 1, wherein: 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 strain-reversal and gas shielding integrated device of claim 1, wherein: The auxiliary support member (7) comprises a threaded sleeve and two screw rods connected to the two ends of the threaded sleeve, respectively, and the length adjustment of the auxiliary support member (7) is realized through the cooperation of the screw rods and the threaded sleeve.

8. A titanium alloy welding reverse deformation and gas protection integrated method, characterized in that: The device of claim 1 is used to implement internal tensioning. 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, thereby driving the ball nut to move axially in a straight line, and the axial linear motion is converted into radial sliding of the radial sliding arm (52) through the support arm (51), finally the tread skeleton (55) is pushed and the support tread (2) and the inert gas protection trailer (3) are moved to fit the inner wall of the annular radiator, and then the inert gas protection trailer joint (4) is used to introduce the protective gas into the inert gas protection trailer (3).

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