Titanium alloy welding reversible deformation and gas protection integrated device

Abstract

The utility model discloses a titanium alloy welding reversible deformation and gas protection integrated device which 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 the stable welding process and quality control are finally achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to welding process technical field, especially be used for titanium alloy product welding process to work piece deformation control and use inert gas protection weld front and back device. 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 aerospace field. 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 each sheet metal part and machined part. Because titanium and titanium alloy are more active in hot state, when each titanium and titanium alloy component is welded without protection, the base material starts to absorb hydrogen at 200 DEG C, starts to absorb oxygen at 400 DEG C, and starts to absorb nitrogen at 600 DEG C. The existence of hydrogen, oxygen and nitrogen will make the weld brittle, so inert gas protection must be used during product welding. In addition, each component of the annular radiator is a thin-walled part, and the product is a cavity structure after assembly welding, so it is impossible to directly shape the product. Therefore, the following problems exist when the titanium alloy annular radiator is welded at present:

[0003] 1) It is difficult to implement gas protection, and a person needs 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. Because the welding area is large, a person needs to hold the gas protection cover to implement protection. That is, the front welding gun moves to where, and the back hand-held cover also needs to move to that place. Because it needs to be controlled manually, there are problems such as high labor intensity and unstable weld protection effect.

[0004] 2) Large deformation after welding, affecting the assembly of the next process part. Because 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 different degrees. The next process part cannot be directly assembled, and the specific strength of titanium alloy is high, and the plasticity is low at room temperature, which causes the product to be unable to be directly shaped, but only through heat treatment to 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 gas protection quality of the weld front and back of the titanium alloy product during welding, replace the manual blowing protection, control the shrinkage deformation during the welding process, and avoid affecting the assembly of the subsequent parts, a more efficient and stable semi-automatic integrated device and welding measures need to be taken. SUMMARY

[0006] The utility model aims at providing a titanium alloy welding reverse deformation and gas protection integrated device, can realize the protection of the front and back of the weld when the titanium alloy annular radiator is welded, has the function of supporting the annular radiator profile control welding deformation, thereby realizes the stable welding process and quality control.

[0007] In order to achieve the above object, the utility model adopts the following technical scheme:

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

[0009] Device base;

[0010] Transmission shaft, the transmission shaft is ball screw, at least two ball nuts are installed on the ball screw, the first end of the ball screw is connected with the output end of the servo motor, and the servo motor is fixed on the device base;

[0011] Inner support movable mechanism, the inner support movable mechanism includes support arm, radial sliding arm, locating block, axial mounting plate, tread skeleton and end face support disc, wherein two end face support discs are spaced apart and installed on the ball screw and make all ball nuts be located between the two end face support discs, the first end of a plurality of support arms is hingedly connected to the circumferential surface of the ball nut, the second end of the support arm is hingedly connected to the first end of the radial sliding arm, the axial mounting plate is arranged in parallel to the ball screw, both ends thereof 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 spaced apart, a plurality of locating blocks are installed in parallel and spaced apart in the interval between the two axial mounting plates in the group, and every two locating blocks form a group, the radial sliding arm is slidingly connected between the two locating 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] Support tread, the inner surface of the support tread is installed on the outer surface of the tread skeleton;

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

[0014] Tread vernier caliper, the tread vernier caliper is fixed on the tread skeleton and close to one end of the auxiliary support member, the tread vernier caliper 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 caliper is provided with an outer diameter scale;

[0015] Inert gas protection drag cover, the inert gas protection drag cover is installed on the outer surface of the tread skeleton and corresponds to the position of the weld on the to-be-welded part, the inert gas protection drag cover 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 aforementioned device is used to implement internal tensioning. First, the connection between the first end of the auxiliary support component and the second end of the ball screw is disconnected. The inner wall of the annular radiator is then fitted onto the support tread. The servo motor is started to drive the transmission shaft to rotate, which in turn drives the ball nut to make axial linear motion. The axial linear motion is then converted into radial sliding of the radial sliding arm through the support arm. Finally, the tread skeleton is pushed and the support tread and the inert gas protective cover are moved to fit the inner wall of the annular radiator. Then, protective gas is introduced into the inert gas protective cover through the inert gas protective cover connector.

[0027] Compared with existing technologies, the integrated device for anti-deformation and gas protection in titanium alloy welding of this utility model solves the problems of difficult implementation of protective gas during the welding of titanium alloy ring radiators, large deformation after welding requiring multiple heat setting leading to decreased mechanical properties, and high manufacturing cycle and cost.

[0028] The device of this invention is simple to operate for welding titanium alloy ring heat sinks. It completes gas protection and reverse shrinkage deformation in one go, eliminating the need for manual operation of protective gas and multiple heat setting treatments, thus achieving a stable welding process and quality control. Attached Figure Description

[0029] Figure 1 Main view of an integrated titanium alloy welding anti-deformation and gas protection device with a titanium alloy annular radiator installed.

[0030] Figure 2 for Figure 1 The right view;

[0031] Figure 3 Isometric drawing of an integrated device for anti-deformation and gas protection in titanium alloy welding;

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

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

[0034] Figure 6 for Figure 5 AA section view;

[0035] Figure 7 Drawing of inert gas protective shield components;

[0036] Figure 8 This is a structural diagram of the internal support mechanism.

[0037] Figure 9 Exploded view of the internal support mechanism;

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

[0039] The utility model will be further explained in connection with the drawings and specific embodiments, but should not be understood as the scope of the subject matter described in the utility model is limited to the following examples, without departing from the above technical ideas of the utility model, all kinds of modifications, replacements and changes made according to the ordinary technical knowledge and conventional means in the art are included in the scope of the utility model.

[0040] As Figures 2 to 9 The titanium alloy welding reverse deformation and gas protection integrated device designed by the utility model, including servo electric control cabinet 1, support tread 2, inert gas protection drag cover 3, inert gas protection drag cover joint 4, inner support movable mechanism 5, transmission shaft 6, auxiliary support member 7, device base 8 and tread vernier 9, wherein the inner support movable mechanism 5 is mainly composed of support arm 51, radial sliding arm 52, positioning block 53, axial mounting plate 54, tread skeleton 55 and end face support disc 56.

[0041] The device base 8 is provided with height adjusting legs at the lower end, and the height adjusting legs include foot pads, screw rods and rotating handles, wherein the screw rods are threadedly connected with the device base 8, and the upper and lower ends of the screw rods are connected with the rotating handles and the foot pads respectively.

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

[0043] As 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 plate 54 is arranged parallel to the ball screw, and the two ends thereof are respectively connected to the two end face support discs 56. Each 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 each 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 uniformly distributed on the circumferential surface of the disc body. The two ends of the axial mounting plate 54 are respectively connected to the connecting plates of the two end face support discs 56. The radial sliding arm 52 is T-shaped, wherein the vertical side corresponding to the T shape is slidingly connected between the two positioning blocks 53 in the same group, and 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 arranged along the length direction of the axial mounting plate 54, and the positioning block 53 is 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 through the cooperation (relative rotation) of the screw rod and the threaded sleeve. A handle is arranged 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 gas. Connect the inert gas hose to the inert gas protective cover connector 4. The protective gas enters the inner cavity of the titanium alloy annular radiator through the inert gas protective cover 3 (the inert gas protective cover 3 has a perforated plate or mesh and steel wool inside, which plays a role in evenly dispersing the protective gas flow). Open the inert gas valve and continue to ventilate for 5 minutes before starting the welding work.

[0053] 5) Complete welding. For the areas of the titanium alloy annular radiator to be welded (… Figure 1 Welding is performed on the nozzle and gas collection hood. Inert protective gas is continuously introduced during the welding process. After welding, the base material of the weld and heat-affected zone must be continuously supplied with inert protective gas in a hot state.

[0054] 6) Remove the titanium alloy annular radiator. After welding is completed and the titanium alloy annular radiator has cooled to room temperature, shut off the inert protective gas. Start the servo electric control cabinet 1, driving the drive shaft 6 to move linearly. At the same time, the inner support movable mechanism 5 retracts with the drive 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 supporting tread 2 moves radially linearly), thereby reducing the outer diameter of the supporting tread 2. Observe the size indication on the tread vernier caliper 9. After the supporting tread 2 reaches the predetermined size, the servo electric control cabinet 1 will be de-energized, stopping the inward retraction of the supporting tread 2. The outer diameter of the supporting tread 2 is smaller than the inner diameter of the titanium alloy annular radiator. Then, simply remove the titanium alloy annular radiator. The welding operation is complete.

[0055] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope 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 rod and the threaded sleeve.

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