Frame vertical position welding clamp

Abstract

The utility model relates to the technical field of friction welding clamps, in particular to a frame vertical position welding clamp which comprises a clamp support, a positioning strip, a supporting strip and a fastening device, the clamp support is installed on an operation platform of friction welding equipment, the positioning strip is vertically installed on the clamp support and limits the transverse position of a frame workpiece, and the supporting strip is installed on the clamping support. The supporting strip is transversely installed on the clamp support and used for limiting and supporting the frame workpiece in the vertical direction. The fastening device is installed on the clamp support, and the driving end of the fastening device abuts against the frame workpiece, so that the frame workpiece is detachably fixed to the preset position of the clamp support, and friction welding operation is facilitated. In conclusion, through multi-directional rigid fixing, a modularized clamping mechanism and optimized structural design, the problems that a traditional clamp is insufficient in rigidity, low in positioning precision and the like in the frame workpiece welding process are solved, the welding stability and the technological adaptability are remarkably improved, and the welding clamp is particularly suitable for friction stir welding and other welding scenes with the high clamping rigidity requirement.

Description

Technical Field

[0001] This utility model relates to the technical field of friction welding fixtures, and in particular to a frame-type vertical welding fixture. Background Technology

[0002] Friction welding is a solid-state joining technology that utilizes the heat generated by friction between the contact surfaces of workpieces as a heat source, causing plastic deformation of the materials under pressure to achieve welding. Among these, friction stir welding (FSW) is widely used in aerospace, rail transportation, and automotive manufacturing due to its advantages such as high weld quality, minimal deformation, and suitability for joining dissimilar materials. This process involves a high-speed rotating stirring head moving along the joint of the workpieces to be welded, plasticizing the material and forming a dense weld under upsetting pressure.

[0003] However, when welding small frame-shaped workpieces (such as aluminum alloy frames, box structures, etc.), traditional fixing methods have the following problems:

[0004] Insufficient rigidity of vacuum adsorption fixation: Although traditional vacuum negative pressure adsorption fixtures are convenient for quick clamping, during the welding process, due to the small force-bearing area and poor rigidity of the frame workpiece, it is easy to displace under the upsetting pressure or friction of the stirring head, resulting in welding misalignment or reduced weld quality.

[0005] Low workpiece positioning accuracy: Frame workpieces usually require the welding of strip workpieces (such as reinforcing ribs, connecting plates, etc.) on the side of their frame. However, existing fixtures mostly use single-point clamping or planar support, which makes it difficult to ensure stable fixation in the horizontal, vertical and lateral directions at the same time, affecting the welding accuracy.

[0006] Poor weldability: During friction stir welding, the workpiece needs to withstand large axial pressure and torque. Traditional fixtures lack targeted rigid reinforcement structures, which can easily lead to loosening or deformation of the workpiece and affect the consistency of welding.

[0007] Therefore, there is an urgent need for a fixture device that can be rigidly fixed in multiple directions and adapted to the characteristics of friction stir welding process, so as to improve welding quality and production efficiency. Utility Model Content

[0008] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0009] This utility model provides a frame vertical welding fixture, including a fixture bracket, a positioning bar, a support bar, and a fastening device. The fixture bracket is installed on the working platform of the friction welding equipment. The positioning bar and the support bar are respectively installed on the same side of the fixture bracket, with the positioning bar vertically installed on the fixture bracket to limit the lateral position of the frame workpiece. The support bar is horizontally installed on the fixture bracket to limit and support the frame workpiece vertically, keeping the part of the frame workpiece to be welded in a vertical upward state, which is convenient for friction welding. The fastening device is installed on the fixture bracket, and its driving end abuts against the frame workpiece, so that the frame workpiece can be detachably fixed in a preset position on the fixture bracket, which is convenient for friction welding operation.

[0010] Furthermore: the fastening device is provided with a first device, which is installed at the end of the clamp bracket away from the positioning strip. Its driving end abuts against the frame of the workpiece away from the positioning strip, so that the positioning strip and the first device cooperate with each other to rigidly fix the two ends of the frame of the workpiece respectively.

[0011] Furthermore, the fastening device is also provided with a second device, which is installed on the side of the fixture bracket where the support bar is located. Its driving end abuts against the side of the frame workpiece away from the fixture bracket, so that the frame workpiece is rigidly fixed to the fixture bracket.

[0012] Furthermore, it also includes a pressing device, which is installed on the fixture bracket, and its driving end abuts against the frame of the frame workpiece from top to bottom, so that the frame workpiece is rigidly fixed to the fixture bracket.

[0013] Furthermore: the fixture bracket is provided with a bracket base plate, a bracket vertical plate and a bracket horizontal plate. The bracket base plate is installed on the working platform of the friction welding equipment, the bracket vertical plate is fixed to the bracket base plate in the vertical direction, and the bracket horizontal plate is fixed to the bracket vertical plate in the horizontal direction.

[0014] Furthermore, the clamp bracket is also provided with diagonal bracing plates, the two sides of which intersect each other are fixed to the bracket base plate and the bracket vertical plate respectively, to reinforce the bracket vertical plate.

[0015] Furthermore, the support vertical plate is provided with a clearance notch at the position of the part to be welded on the frame workpiece. The strip workpiece can be placed in the clearance notch and form an abutment with the frame workpiece to facilitate friction welding.

[0016] Furthermore, the support vertical plate is provided with an auxiliary abutment corresponding to the position of the clearance notch. The auxiliary abutment is installed on the other side of the support vertical plate where the support bar is not installed, and the auxiliary abutment is provided with a clearance groove so that the clearance groove and the clearance notch cooperate with each other to form a receiving space for placing the strip workpiece.

[0017] Furthermore: The fastening device is equipped with a fastening frame, an active slider, a passive slider, and a fastening cylinder. The fastening frame and the fastening cylinder are respectively mounted on the fixture bracket. The active slider is slidably connected to the fastening frame along the axial direction of the piston rod of the fastening cylinder. The passive slider is slidably connected to the fastening frame along the axial direction perpendicular to the piston rod of the fastening cylinder. One end of the active slider is driven to the piston end of the fastening cylinder, and the other end is driven to the passive slider through the inclined guide groove and the inclined guide rail.

[0018] Furthermore: the pressing device is equipped with a pressing cylinder, a pressing bolt and a pressing bar. The pressing cylinder is installed on the fixture bracket. One end of the pressing bolt is fixed to the piston rod of the pressing cylinder, and the other end is fixed to the pressing bar, so that the pressing cylinder drives the pressing bar to abut against the frame of the workpiece.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. Multi-directional rigid fixation improves welding stability.

[0021] Lateral limiting: The vertically installed positioning strips abut against both ends of the frame workpiece with the first device to limit its lateral displacement.

[0022] Vertical support: Horizontally installed support bars hold the frame of the workpiece, providing stable support and ensuring that the part to be welded remains vertically upward.

[0023] Lateral reinforcement: A second device is added to abut against the frame from the side to prevent the workpiece from shifting laterally during welding, which is especially suitable for the stable fixing of workpieces with narrow frames.

[0024] Axial clamping: The top clamping device applies pressure from top to bottom, forming a two-way clamping with the support bar, effectively resisting the upsetting force of friction stir welding and preventing the workpiece from warping or loosening.

[0025] 2. Modular clamping mechanism to adapt to different welding needs

[0026] The first device works in conjunction with the positioning bar to achieve rigid fixation at both ends of the frame workpiece, which is suitable for stable clamping of the frame workpiece.

[0027] The second device adopts a wedge transmission mechanism (active slider + passive slider), which is driven by a cylinder to achieve automatic clamping, improves clamping efficiency, and can be set in multiple groups to enhance the lateral fixing effect.

[0028] The top-pressing device adopts an adjustable top-pressing bolt + top-pressing bar structure to adapt to the pressing requirements of workpieces of different thicknesses and ensure uniform pressure distribution during the welding process.

[0029] 3. Structural optimization improves welding operability

[0030] Clearance notch design: Clearance notches are set on the vertical plate of the support to facilitate the placement and alignment of strip workpieces and ensure accurate weld position.

[0031] Auxiliary anti-block positioning: By cooperating with the avoidance groove and avoidance notch, a stable space for accommodating the strip workpiece is formed, improving welding accuracy.

[0032] Diagonal bracing plate enhances rigidity: Diagonal bracing plate is added between the vertical plate and the bottom plate of the support to enhance the overall structural strength and prevent welding vibration from causing fixture deformation.

[0033] 4. Improve production efficiency and welding quality

[0034] The cylinder-driven clamping mechanism enables rapid clamping and release, reducing auxiliary time and improving production efficiency. Multi-directional rigid fixing effectively reduces welding deformation, ensuring consistent weld formation and increasing product qualification rate.

[0035] Therefore, through the above improvements, this patent solves the problems of insufficient rigidity and low positioning accuracy of traditional fixtures in the welding of frame workpieces by means of multi-directional rigid fixing, modular clamping mechanism and optimized structural design, which significantly improves welding stability and process adaptability, and is especially suitable for welding scenarios with high requirements for clamping rigidity, such as friction stir welding.

[0036] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a structural schematic diagram of the clamp bracket and fastening device of this utility model;

[0039] Figure 2 This is a structural schematic diagram of the clamp bracket and the frame workpiece of this utility model;

[0040] Figure 3 This is a structural schematic diagram of the fastening device of this utility model in the open state;

[0041] Figure 4 This is a schematic diagram of the top-pressing device of this utility model in the open state;

[0042] Figure 5This is a structural schematic diagram of the bracket cross plate and support strip of this utility model;

[0043] Figure 6 This is a schematic diagram of the active slider and the passive slider of this utility model.

[0044] The reference numerals and names in the figure are as follows:

[0045] 10. Fixture bracket; 11. Bracket base plate; 12. Bracket horizontal plate; 13. Diagonal brace plate; 14. Positioning strip; 15. Support strip; 16. Bracket vertical plate; 17. Clearance notch; 18. Auxiliary stop block; 19. Clearance groove; 20. Fastening device; 21. Fastening cylinder; 22. Fastening frame; 23. Active slider; 24. Passive slider; 25. Diagonal guide groove; 26. Diagonal guide rail; 27. First device; 28. Second device; 30. Top pressing device; 31. Top pressing cylinder; 32. Top pressing bolt; 33. Top pressing strip; 40. Frame workpiece; 41. Strip workpiece. Detailed Implementation

[0046] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0047] Please see Figures 1 to 6 In this embodiment of the present invention, a frame vertical welding fixture includes a fixture bracket 10, a positioning bar 14, a support bar 15, and a fastening device 20. The fixture bracket 10 is installed on the working platform of the friction welding equipment. The positioning bar 14 and the support bar 15 are respectively installed on the same side of the fixture bracket 10. The positioning bar 14 is installed vertically on the fixture bracket 10 to limit the lateral position of the frame workpiece 40. The support bar 15 is installed horizontally on the fixture bracket 10 to limit and support the frame workpiece 40 in the vertical direction, so that the part of the frame workpiece 40 to be welded is kept in a vertically upward state, which is convenient for friction welding. The fastening device 20 is installed on the fixture bracket 10, and its driving end abuts against the frame workpiece 40, so that the frame workpiece 40 is detachably fixed in a preset position of the fixture bracket 10, which is convenient for friction welding operation.

[0048] Specifically, friction welding refers to a welding method that utilizes the heat generated by friction between the contact surfaces of workpieces as a heat source, causing the workpieces to undergo plastic deformation under pressure. Under pressure, with constant or increasing pressure and torque, the relative motion between the welding contact surfaces generates frictional heat and plastic deformation heat in the friction surface and its vicinity, raising the temperature in the vicinity to a range close to but generally below the melting point. This reduces the material's resistance to deformation, increases its plasticity, and breaks down the oxide film at the interface. Under the action of upsetting pressure, the material undergoes plastic deformation and flow, achieving solid-state welding through molecular diffusion and recrystallization at the interface. Friction stir welding, on the other hand, utilizes the heat generated by the friction between a high-speed rotating welding tool and the workpiece to cause plastic deformation and flow in the welded material. As the welding tool moves forward along the welding interface, the plasticized material flows from the front to the rear of the welding tool under the rotational friction force of the tool, forming a dense solid-phase weld under the pressure of the tool.

[0049] Therefore, during the welding process, the workpieces to be welded need to be rigidly fixed on the fixture support 10, while the welding head rotates at high speed and moves relative to each other along the joint between the two workpieces. In the welding operation of the relatively small frame workpiece 40, since the workpiece to be welded is square in shape, when other strip-shaped workpieces need to be welded to the side end of its frame, the frame workpiece 40 first needs to be erected, and then the frame workpiece 40 needs to be kept in an upright state and rigidly fixed on the fixture support 10.

[0050] Traditional vacuum negative pressure adsorption fixation methods, while convenient for securing workpieces, lack rigidity and may lead to displacement during welding, affecting weld quality. This is particularly problematic when the frame of the vertically positioned workpiece 40 has a small stress-bearing area, and when welding a strip-shaped workpiece 41, the negative pressure adsorption area is too small, resulting in poor fixation. Therefore, improvements are necessary.

[0051] Therefore, this patent provides both a positioning strip 14 and a support strip 15 on one side of the fixture bracket 10. The vertical installation of the positioning strip 14 can limit the lateral position of the frame workpiece 40, while the lateral installation of the support strip 15 can limit the frame of the frame workpiece 40 and provide support for the frame of the frame workpiece 40. This allows the frame workpiece 40 to be hung on the support strip 15, facilitating the welding operation of the strip workpiece 41 on its side.

[0052] Secondly, a fastening device 20 is also provided on the fixture bracket 10, which is fixed to the fixture bracket 10, so that the driving end of the fastening device 20 can abut against the frame workpiece 40, so that the frame workpiece 40 is rigidly fixed on the fixture bracket 10, which facilitates the subsequent friction stir welding operation.

[0053] like Figures 1 to 3 As shown, preferably, the fastening device 20 is provided with a first device 27, which is installed at the end of the clamp bracket 10 away from the positioning strip 14. Its driving end abuts against the frame of the frame workpiece 40 away from the positioning strip 14, so that the positioning strip 14 and the first device 27 cooperate with each other to rigidly fix the two ends of the frame workpiece 40 respectively.

[0054] Specifically, since the positioning bar 14 has already limited one end of the frame workpiece 40, it is only necessary to set the first device 27 at the position of the fixture bracket 10 corresponding to the other end of the frame workpiece 40 so that the driving end of the first device 27 can abut against the frame of the frame workpiece 40, thereby realizing a separable rigid fixed connection operation.

[0055] like Figures 1 to 2 As shown, preferably, the fastening device 20 is further provided with a second device 28. The second device 28 is installed on the side of the clamp bracket 10 where the support bar 15 is provided, and its driving end abuts against the side of the frame workpiece 40 away from the clamp bracket 10, so that the frame workpiece 40 is rigidly fixed to the clamp bracket 10.

[0056] Specifically, although the upsetting pressure is mainly applied from top to bottom when performing friction stir welding on the frame workpiece 40 and the strip workpiece 41, and only the support bar 15 is needed to support the frame of the frame workpiece 40, the frame is narrow and is prone to displacement when subjected to upsetting pressure, which affects the welding effect. Therefore, a second device 28 can be set on the side of the fixture bracket 10 to abut against the side of the frame workpiece 40, so that it can be firmly and rigidly fixed on the fixture bracket 10 from the side.

[0057] Secondly, since the frame of the workpiece 40 is relatively long, multiple sets of second devices 28 are provided to further improve its stability, and these devices abut against the sides of the frame of the workpiece 40. For example, three sets of second devices 28 are provided, abutting against the two ends and the middle of the frame, respectively, to maximize the rigid fixation of the sides of the frame.

[0058] like Figure 1 and Figure 3 As shown, preferably, it also includes a pressing device 30, which is installed on the fixture bracket 10. Its driving end abuts against the frame of the frame workpiece 40 from top to bottom, so that the frame workpiece 40 is rigidly fixed to the fixture bracket 10.

[0059] Specifically, since the frame of the workpiece 40 is relatively narrow, when the edge is subjected to friction stir welding, even if the second device 28 is set to abut against its side, the relative position relationship may still be deviated to a certain extent. Therefore, a top pressing device 30 can be set on the fixture bracket 10 so that its driving end can abut against the frame from top to bottom, so that the frame can be better fixed on the support bar 15.

[0060] Secondly, since the driving end of the pressing device 30 abuts from above, its installation position can be set on the same side of the fixture bracket 10 where the second device 28 is installed, or it can be set on the other side of the fixture bracket 10. It is only necessary to release the abutment operation on the frame workpiece 40 to facilitate the picking and placing of the frame workpiece 40.

[0061] like Figures 3 to 5 As shown, preferably, the fixture bracket 10 is provided with a bracket base plate 11, a bracket vertical plate 16 and a bracket horizontal plate 12. The bracket base plate 11 is installed on the working platform of the friction welding equipment, the bracket vertical plate 16 is fixed to the bracket base plate 11 in the vertical direction, and the bracket horizontal plate 12 is fixed to the bracket vertical plate 16 in the horizontal direction.

[0062] Specifically, to facilitate the installation of the fixture, a fixture base plate can be provided to form a base for installation on the external friction welding equipment. In order to better hold the frame of the workpiece 40, it is preferable to install the support vertical plate 16 vertically on the support base plate 11, and to install the support horizontal plate 12, positioning strip 14 and support strip 15 on the same side of the support vertical plate 16. The support horizontal plate 12 is used to support and install the second device 28 or the top pressing device 30.

[0063] like Figure 3 As shown, preferably, the clamp bracket 10 is also provided with a diagonal brace 13, the two sides of the diagonal brace 13 that intersect each other are respectively fixed to the bracket base plate 11 and the bracket vertical plate 16 to reinforce the bracket vertical plate 16.

[0064] Specifically, since the vertical support plate 16 is installed vertically on the base plate 11, the contact area between the two is relatively small. To enhance its structural strength, it is preferable to provide a diagonal brace plate 13. The two intersecting side walls of the diagonal brace plate 13 abut against the base plate 11 and the vertical support plate 16 respectively, forming a reinforced support and strengthening effect. Since one side of the vertical support plate 16 needs to be equipped with a positioning strip 14, a support strip 15, a horizontal support plate 12, a fastening device 20, etc., the diagonal brace plate 13 is preferably located on the other side of the vertical support plate 16 where the support strip 15 is not installed.

[0065] like Figure 3As shown, preferably, the support vertical plate 16 is provided with an avoidance notch 17 at the position of the part to be welded on the frame workpiece 40. The strip workpiece 41 can be placed in the avoidance notch 17 and form an abutment with the frame workpiece 40 to facilitate friction welding.

[0066] Specifically, since the side of the frame workpiece 40 needs to be welded with strip workpiece 41, a corresponding clearance notch 17 needs to be set at the corresponding position of the bracket vertical plate 16 so that the strip workpiece 41 can be placed.

[0067] like Figure 3 and Figure 5 As shown, preferably, the support vertical plate 16 is provided with an auxiliary abutment 18 corresponding to the position of the avoidance notch 17. The auxiliary abutment 18 is installed on the other side of the support vertical plate 16 where the support bar 15 is not installed, and the auxiliary abutment 18 is provided with an avoidance groove 19, so that the avoidance groove 19 and the avoidance notch 17 cooperate with each other to form a receiving space for placing the strip workpiece 41.

[0068] Specifically, since the strip workpiece 41 has a certain length, in order to make the strip workpiece 41 and the frame workpiece 40 fit together tightly, it is preferable to also fix an auxiliary block 18 on the other side of the support vertical plate 16, and provide a corresponding clearance groove 19 on the auxiliary block 18 so that the strip workpiece 41 can be placed into the receiving space formed by the combination of the clearance groove 19 and the clearance notch 17.

[0069] like Figure 6 As shown, preferably, the fastening device 20 includes a fastening frame 22, an active slider 23, a passive slider 24, and a fastening cylinder 21. The fastening frame 22 and the fastening cylinder 21 are respectively mounted on the clamp bracket 10. The active slider 23 is slidably connected to the fastening frame 22 along the axial direction of the piston rod of the fastening cylinder 21. The passive slider 24 is slidably connected to the fastening frame 22 along the axial direction perpendicular to the piston rod of the fastening cylinder 21. One end of the active slider 23 is driven to the piston end of the fastening cylinder 21, and the other end is driven to the passive slider 24 through the inclined guide groove 25 and the inclined guide rail 26.

[0070] Specifically, the fastening frame 22 and the fastening cylinder 21 can be respectively mounted and fixed to the clamp bracket 10. For example, the fastening frame 22 and the fastening cylinder 21 of the first device 27 can be mounted on the vertical plate 16 of the bracket, while the fastening frame 22 and the fastening cylinder 21 of the second device 28 can be mounted on the horizontal plate 12 of the bracket. The active slider 23 is slidably connected to the fastening frame 22 along the piston rod axis of the fastening cylinder 21, and the passive slider 24 is slidably connected to the fastening frame 22 along an axis perpendicular to the piston rod of the fastening cylinder 21.

[0071] Secondly, the inclined guide groove 25 and the inclined guide rail 26 cooperate to form an inclined wedge mechanism. One end of the active slider 23 is connected to the piston end of the fastening cylinder 21. Its vertical movement is transformed into the horizontal movement of the passive slider 24 through the inclined guide groove 25 and the inclined guide rail 26. This allows the outward extension of the passive slider 24 to change its distance relative to the fastening frame 22, achieving a certain degree of telescopic movement, which abuts against the frame of the frame workpiece 40 to form a rigid fixation.

[0072] like Figure 4 As shown, preferably, the top pressing device 30 is provided with a top pressing cylinder 31, a top pressing bolt 32 and a top pressing strip 33. The top pressing cylinder 31 is installed on the fixture bracket 10. One end of the top pressing bolt 32 is fixed to the piston rod of the top pressing cylinder 31, and the other end is fixed to the top pressing strip 33, so that the top pressing cylinder 31 drives the top pressing strip 33 to abut against the frame of the frame workpiece 40.

[0073] Specifically, in order to abut against the frame of the workpiece 40 from top to bottom, it is preferable to set up a top-pressing cylinder 31 and use a top-pressing bolt 32 to extend a certain length of the fixed top-pressing strip 33. The top-pressing strip 33 can move vertically at its free end to press against the frame, thereby improving its stability and strengthening its rigid fixation.

[0074] Secondly, the installation position of the top-pressing cylinder 31 can be optimized according to the overall size of the frame workpiece 40 and the installation position of the fastening device 20. It can be installed on the horizontal plate 12 of the bracket, or a separate horizontal plate can be set on the other side of the vertical plate 16 of the bracket for installation, to ensure that the top-pressing device 30 and the fastening device 20 will not interfere with each other during operation.

[0075] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A frame standing welding jig characterized by comprising: The utility model provides a friction welding fixture, which comprises a clamp support (10), a positioning strip (14), a supporting strip (15) and a fastening device (20), the clamp support (10) is installed on the operation platform of a friction welding device, the positioning strip (14) and the supporting strip (15) are installed on the same side of the clamp support (10) respectively, the positioning strip (14) is installed vertically on the clamp support (10), and the transverse position of a frame workpiece (40) is limited; the supporting strip (15) is installed transversely on the clamp support (10), and the frame workpiece (40) is limited and supported in the vertical direction, so that the part to be welded of the frame workpiece (40) is kept in an upright upward state, and the friction welding is facilitated; the fastening device (20) is installed on the clamp support (10), and the driving end of the fastening device (20) abuts against the frame workpiece (40), so that the frame workpiece (40) is fixed at a preset position of the clamp support (10) in a detachable mode, and the friction welding operation is facilitated.

2. The frame welding fixture according to claim 1, wherein The fastening device (20) is provided with a first device (27), the first device (27) is installed on one end of the clamp support (10) away from the positioning strip (14), the driving end of the first device (27) abuts against the frame workpiece (40) away from the positioning strip (14), the positioning strip (14) and the first device (27) are matched with each other, and the two end frames of the frame workpiece (40) are rigidly fixed respectively.

3. The frame welding fixture of claim 1, wherein The fastening device (20) is also provided with a second device (28), the second device (28) is installed on one side of the clamp support (10) provided with the supporting strip (15), and the driving end of the second device (28) abuts against the side of the frame workpiece (40) away from the clamp support (10), so that the frame workpiece (40) is rigidly fixed to the clamp support (10).

4. The frame welding fixture of claim 1, wherein The utility model also comprises a pressing device (30), the pressing device (30) is installed on the clamp support (10), and the driving end of the pressing device (30) abuts against the frame workpiece (40) from top to bottom, so that the frame workpiece (40) is rigidly fixed to the clamp support (10).

5. The frame welding fixture of claim 1, wherein The clamp support (10) is provided with a support bottom plate (11), a support vertical plate (16) and a support horizontal plate (12), the support bottom plate (11) is installed on the operation platform of a friction welding device, the support vertical plate (16) is fixedly connected to the support bottom plate (11) in the vertical direction, and the support horizontal plate (12) is fixedly connected to the support vertical plate (16) in the horizontal direction.

6. A frame welding fixture according to claim 5, wherein The clamp support (10) is also provided with inclined support plates (13), the two sides of the inclined support plates (13) intersecting with each other are fixedly connected to the support bottom plate (11) and the support vertical plate (16) respectively, and the support vertical plate (16) is reinforced.

7. The frame welding fixture of claim 5, wherein The support vertical plate (16) is also provided with an avoiding notch (17) corresponding to the position of the part to be welded of the frame workpiece (40), and a strip-shaped workpiece (41) can be placed in the avoiding notch (17) and abut against the frame workpiece (40), so that the friction welding treatment is facilitated.

8. The frame welding fixture of claim 7, wherein The support vertical plate (16) is provided with an auxiliary abutting block (18) corresponding to the position of the avoiding gap (17), the auxiliary abutting block (18) is installed on the other side of the support vertical plate (16) without the support strip (15), and the auxiliary abutting block (18) is provided with an avoiding groove (19), so that the avoiding groove (19) and the avoiding gap (17) are matched with each other to form a containing space for placing the strip-shaped workpiece (41).

9. The frame welding fixture of claim 1, wherein, The fastening device (20) is provided with a fastening frame (22), a driving sliding block (23), a passive sliding block (24) and a fastening cylinder (21), the fastening frame (22) and the fastening cylinder (21) are respectively installed on the clamp support (10), the driving sliding block (23) is slidably connected to the fastening frame (22) along the axial direction of the piston rod of the fastening cylinder (21), the passive sliding block (24) is slidably connected to the fastening frame (22) along the axial direction perpendicular to the piston rod of the fastening cylinder (21), one end of the driving sliding block (23) is drivingly connected to the piston end of the fastening cylinder (21), and the other end of the driving sliding block (23) is drivingly connected to the passive sliding block (24) through the oblique guide groove (25) and the oblique guide rail (26).

10. The frame welding fixture of claim 4, wherein The top pressing device (30) is provided with a top pressing cylinder (31), a top pressing bolt (32) and a top pressing strip (33), the top pressing cylinder (31) is installed on the clamp support (10), one end of the top pressing bolt (32) is fixedly connected to the piston rod of the top pressing cylinder (31), and the other end of the top pressing bolt (32) is fixedly connected to the top pressing strip (33), so that the top pressing cylinder (31) drives the top pressing strip (33) to abut against the frame of the frame-shaped workpiece (40).

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