A welding forming tool

Abstract

This utility model discloses a welding forming fixture. The fixture includes: a fixture body on which a workpiece to be welded is placed; positioning blocks welded to the front and rear ends of the fixture body, with the positioning blocks abutting against the end face of the workpiece to be welded; a gantry frame, in an inverted U-shape, spanning the left and right ends of the fixture body and movable along the front and back of the fixture body; a hydraulic device located at the bottom center of the gantry frame, used to apply pressure to the workpiece to be welded, pressing it firmly against the fixture body; and a welding device to weld and fix the workpiece pressed against the fixture body to the fixture body, thus obtaining a formed workpiece. This fixture achieves high-precision curvature fitting through a customized fixture body, avoiding the high cost and long cycle of molding, and solving the problem of rolling irregular curved surfaces; the hydraulic device applies controllable stress to ensure stable fitting and avoids stress concentration caused by traditional bending and pressing.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and more specifically, to a welding forming tooling. Background Technology

[0002] In the field of mechanical manufacturing, the forming and machining of thin-walled curved surfaces is an important technological process. Currently, for regular arc-shaped curved surfaces, rolling mills are commonly used for manufacturing, a mature and efficient process. However, for irregular curved surfaces, due to the significant differences in curvature between each segment, traditional rolling methods cannot be used, posing a considerable challenge to manufacturing.

[0003] In existing technologies, there are two main methods for forming irregular curved surfaces: one is the molding method, which involves manufacturing a mold through casting and then molding. While this method can guarantee forming accuracy, the mold processing is complex, time-consuming, and costly, making it uneconomical for large workpieces produced in small batches, thus limiting its application in actual production. The other method is the bending method, which calculates and divides the bending points of thin-walled parts, using a bending machine to perform bending every 1-5mm to complete the forming. Although this method can achieve the forming of irregular curved surfaces, it is time-consuming and labor-intensive, only suitable for processing single curved surfaces, and the formed surface is extremely rough, making it difficult to meet high precision requirements.

[0004] Especially in the manufacture of large, thin-walled pressure-resistant shells, both of the above methods have significant shortcomings. The molding method is unsuitable due to the high cost of the molds; the bending method struggles to guarantee forming quality and precision. Therefore, there is an urgent need to develop a new tooling and process for welding and forming large, irregular curved surfaces to solve the problems existing in the current technology. Utility Model Content

[0005] This utility model provides a welding forming fixture to solve the problems of high mold cost in the molding method and low forming quality and precision in the bending method in the prior art.

[0006] To achieve the above objectives, this utility model provides a welding forming fixture, which includes: a fixture body on which a workpiece to be welded is placed; positioning blocks welded to the front and rear ends of the fixture body, and the positioning blocks abutting against the end face of the workpiece to be welded; a gantry frame with an inverted U-shaped structure, spanning the left and right ends of the fixture body, and movable along the front and back of the fixture body; a hydraulic device disposed at the bottom middle of the gantry frame, used to apply pressure to the workpiece to be welded to press it against the fixture body; and a welding device for welding and fixing the workpiece pressed against the fixture body to the fixture body to obtain a formed workpiece.

[0007] Optionally, the tooling body includes: positioning plates and reinforcing ribs; multiple positioning plates are provided, all of which are equally spaced, and the workpiece to be welded is placed on the positioning plates; multiple reinforcing ribs are provided to fix all the positioning plates together along an arrangement direction perpendicular to the positioning plates.

[0008] Optionally, the positioning blocks are welded to the front and rear positioning plates of the tooling body; multiple positioning blocks are welded to the front end of the front positioning plate of the tooling body, all of the positioning blocks are spaced apart, and all of the positioning blocks abut against the front end face of the workpiece to be welded; multiple positioning blocks are welded to the rear end of the rear positioning plate of the tooling body, all of the positioning blocks are spaced apart, and all of the positioning blocks abut against the rear end face of the workpiece to be welded.

[0009] Optionally, a positioning nut is welded onto each of the positioning blocks to allow the locking bolt to pass through and press against the workpiece to be welded, so that the workpiece to be welded is pressed tightly against the positioning plate.

[0010] Optionally, it may also include: a support plate, placed on the molded workpiece, for pressing the molded workpiece to shape it.

[0011] Optionally, the gantry includes: a first support beam, a crossbeam, and a second support beam connected in sequence; the length of the crossbeam is greater than the length of the positioning plate; and the height of the first support beam and the second support beam is greater than the height of the positioning plate.

[0012] Optionally, the hydraulic device is located at the bottom end of the crossbeam, and multiple hydraulic devices are provided, with all of the hydraulic devices spaced apart along the bottom end of the crossbeam.

[0013] Optionally, the top surface of the positioning plate has an arc-shaped structure.

[0014] Optionally, at least two gantry frames are provided.

[0015] Optionally, the gantry frame is a one-piece structure.

[0016] The beneficial effects of this utility model are:

[0017] This utility model provides a welding forming fixture that achieves high-precision curvature fitting through a customized fixture body, avoiding the high cost and long cycle of molding and solving the problem of irregular curved surfaces being unable to be rolled. Controllable stress is applied through a hydraulic device to ensure stable fitting and avoid stress concentration caused by traditional bending and pressing. The fixture body and hydraulic device can be repeatedly installed and used to adapt to workpieces of different sizes. Attached Figure Description

[0018] Figure 1 This is a front view of a welding forming fixture provided in an embodiment of this utility model;

[0019] Figure 2 This is a perspective view of a welding forming fixture provided in an embodiment of this utility model.

[0020] Symbol explanation:

[0021] Tooling body -1, positioning block -2, gantry frame -3, hydraulic device -4, positioning nut -5, locking bolt -6, support plate -7, workpiece to be welded -8, positioning plate -11, reinforcing rib -12, first support beam -31, crossbeam -32, second support beam -33. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. 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.

[0023] Figure 1 This is a front view of a welding forming fixture provided in an embodiment of this utility model; Figure 2 This is a perspective view of a welding forming fixture provided in an embodiment of this utility model; as shown. Figure 1 and Figure 2 As shown, the welding forming fixture includes:

[0024] 1. Tooling body 1, on which the workpiece 8 to be welded is placed;

[0025] The main body of the fixture 1 is an integral load-bearing platform, preferably using a welded frame structure made of thick steel plates, which has good flatness and rigidity, and is used to support and place the workpiece 8 to be welded (i.e., a large, irregular curved, thin-walled part). The top of the main body of the fixture 1 has a preset curvature to match the basic outline of the workpiece 8 to be welded, and can be designed as a replaceable structure according to actual production needs to adapt to workpieces 8 with different curvatures or sizes.

[0026] In an optional embodiment, the tooling body 1 includes: a positioning plate 11 and a reinforcing rib 12;

[0027] Multiple positioning plates 11 are provided, and all the positioning plates 11 are equally spaced. The workpiece 8 to be welded is placed on the positioning plate 11.

[0028] Multiple reinforcing ribs 12 are provided to fix all the positioning plates 11 together along an arrangement direction perpendicular to the positioning plates 11.

[0029] Specifically, multiple positioning plates 11 are provided, preferably more than five, with the specific number set according to the length of the workpiece 8 to be welded. All positioning plates 11 are arranged at equal intervals along the longitudinal direction of the tooling body 1 (i.e., consistent with the extension direction of the workpiece 8 to be welded), forming a regular support pitch to uniformly bear and restrict the curvature change of the workpiece 8 to be welded.

[0030] The top surface of each positioning plate 11 is an arc-shaped structure, and its surface contour is designed according to the irregular curved surface of the workpiece to be formed. The positioning plate 11 is machined or laser-cut to ensure that its arc-shaped curvature meets the required accuracy.

[0031] During actual assembly, the workpiece 8 to be welded is placed on the upper surface of all the positioning plates 11. The surface curvature of the positioning plate 11 is basically consistent with the bottom surface shape of the workpiece 8 to be welded, thereby achieving point-to-surface fit support and preventing local stress concentration and deformation.

[0032] Multiple reinforcing ribs 12 are provided, preferably eight, distributed along a direction perpendicular to the positioning plates 11 (i.e., along the transverse direction of the tooling body 1). The reinforcing ribs 12 penetrate the middle and lower parts of the multiple positioning plates 11, and are welded or screwed to each positioning plate 11 to form a frame-type integrated tooling body 1 structure. The reinforcing ribs 12 are made of high-rigidity materials such as rectangular steel pipes, channel steel, or H-beams, maintaining the structural stability of the entire tooling body 1 during use.

[0033] 2. Positioning block 2, welded to the front and rear ends of the tooling body 1, and the positioning block 2 abuts against the end face of the workpiece 8 to be welded;

[0034] In an optional embodiment, the positioning block 2 is welded to the front positioning plate 11 and the rear positioning plate 11 of the tooling body 1;

[0035] Multiple positioning blocks 2 are welded to the front end of the front end positioning plate 11 of the tooling body 1. All the positioning blocks 2 are spaced apart, and all the positioning blocks 2 abut against the front end face of the workpiece 8 to be welded.

[0036] Multiple positioning blocks 2 are welded to the rear end of the rear positioning plate 11 of the tooling body 1. All the positioning blocks 2 are spaced apart and all the positioning blocks 2 abut against the rear end face of the workpiece 8 to be welded.

[0037] Specifically, multiple positioning blocks 2 are welded to the front end face of the front positioning plate 11 of the main fixture 1 in the transverse direction (i.e., perpendicular to the length direction of the workpiece 8 to be welded). These positioning blocks 2 maintain a preset interval distance (e.g., 500mm, which can be adjusted according to the workpiece size) to form a uniformly distributed limiting array. Each positioning block 2 is oriented perpendicular to the end face of the workpiece 8 to be welded, and it is in direct contact with the front end face of the workpiece 8 to be welded, used to restrict its forward movement when the workpiece 8 is placed, ensuring that the workpiece 8 to be welded is fixed at the longitudinal zero point position.

[0038] On the rear end face of the rear end positioning plate 11 of the tooling body 1, multiple positioning blocks 2 are also welded in the transverse direction, and their arrangement is the same as that of the front end positioning blocks 2. The rear end positioning blocks 2 are in contact with the rear end face of the workpiece 8 to be welded, thereby providing reverse limiting on the other side of the longitudinal direction of the workpiece 8 to be welded, preventing the workpiece 8 to be welded from moving backward.

[0039] Furthermore, the upper end face of the positioning block 2 is higher than the upper surface of the workpiece 8 to be welded, which can effectively limit the longitudinal displacement of the workpiece 8 to be welded and prevent slippage.

[0040] 3. The gantry frame 3 has an inverted U-shaped structure, spans the left and right ends of the tooling body 1, and can move back and forth along the tooling body 1; it is used to perform clamping operations on the workpiece 8 to be welded at different positions.

[0041] In an optional embodiment, the gantry 3 includes: a first support beam 31, a crossbeam 32, and a second support beam 33 connected in sequence;

[0042] The length of the crossbeam 32 is greater than the length of the positioning plate 11; the height of the first support beam 31 and the second support beam 33 is greater than the height of the positioning plate 11.

[0043] Specifically, the first support beam 31 and the second support beam 33 are located on the left and right sides of the main body of the tooling 1, respectively, and are arranged vertically to support the crossbeam 32. The crossbeam 32 connects the top ends of the first support beam 31 and the second support beam 33, forming the top span beam structure of the gantry 3. The first support beam 31, the crossbeam 32, and the second support beam 33 are all made of high-strength profiles such as rectangular steel pipes, H-beams, or channel steel to ensure overall rigidity and safety.

[0044] The gantry 3 can be moved manually or by being equipped with an electric drive mechanism.

[0045] Furthermore, to accommodate the forming and welding requirements of large or extra-long workpieces 8, at least two gantry frames 3 can be arranged longitudinally along the main body of the tooling 1. Each gantry frame 3 is an integral structure, that is, the first support beam 31, the crossbeam 32, and the second support beam 33 form a rigid frame through welding or integral processing, which cannot be separated.

[0046] In an optional embodiment, a positioning nut 5 is welded to each of the positioning blocks 2 to allow the locking bolt 6 to pass through and press against the workpiece 8 to be welded, so that the workpiece 8 to be welded is pressed against the positioning plate 11.

[0047] Specifically, such as Figure 2 As shown, a positioning nut 5 is welded to the inner side of each positioning block 2 (near the workpiece 8 to be welded); the central axis of the positioning nut 5 is perpendicular to the central axis of the locking bolt 6 in the direction of the workpiece 8 to be welded. In use, the locking bolt 6 is inserted from above the positioning nut 5 and pushed down until the end of the locking bolt 6 contacts the workpiece 8 to be welded. The locking bolt 6 is then tightened, and the thread drive converts the axial force into a clamping force on the workpiece 8 to be welded, so that the workpiece 8 to be welded is firmly attached to the positioning plate 11.

[0048] 4. A hydraulic device 4 is located at the bottom middle part of the gantry frame 3 and is used to apply pressure to the workpiece 8 to be welded so as to press it against the tooling body 1.

[0049] In an optional embodiment, the hydraulic device 4 is disposed at the bottom end of the crossbeam 32, and multiple hydraulic devices 4 are disposed, with all of the hydraulic devices 4 spaced apart along the bottom end of the crossbeam 32.

[0050] Specifically, the hydraulic devices 4 are multiple (preferably 3 to 6) and arranged at intervals along the bottom end of the crossbeam 32. This arrangement allows the hydraulic devices 4 to act simultaneously on multiple lateral positions of the workpiece 8 to be welded, achieving multi-point synchronous clamping and avoiding local warping or deformation caused by single-point pressure. The interval between the hydraulic devices 4 can be set according to the width and rigidity of the workpiece 8 to be welded, typically 300 mm. The interval arrangement ensures that the clamping force is evenly distributed along the width direction of the workpiece 8 during the pressure application process, thereby effectively improving the overall bonding quality.

[0051] Furthermore, during the pressure application process, the hydraulic device 4 extends the piston rod to press the workpiece 8 to be welded against the positioning plate 11.

[0052] 5. Welding device: The workpiece 8 to be welded, which is pressed against the tooling body 1, is welded and fixed onto the tooling body 1 to obtain a shaped workpiece.

[0053] In an optional embodiment, the workpiece 8 to be welded, which is pressed against the tooling body 1, is spot welded to the tooling body 1 to obtain a shaped workpiece.

[0054] Specifically, when the workpiece 8 to be welded is longitudinally limited by the front and rear positioning blocks 2 and the locking bolts 6, and is pressed onto the positioning plate 11 of the tooling body 1 by the hydraulic device 4, the workpiece 8 to be welded can be fixed onto the positioning plate 11 of the tooling body 1 by spot welding, thereby forming a stable forming state.

[0055] In an optional embodiment, the welding forming fixture further includes a support plate 7 placed on the forming workpiece for pressing the forming workpiece to shape it.

[0056] Specifically, after the workpiece 8 to be welded completes the initial forming of the irregular curved surface through steps such as hydraulic pressing and spot welding, a support plate 7 is placed on the formed workpiece. The formed workpiece is kept in a fixed state with the support plate 7 attached and left to stand (preferably for 12 to 24 hours) to further stabilize the shape of the workpiece and reduce residual internal stress, thereby achieving high-precision curved surface forming.

[0057] The beneficial effects of this utility model are:

[0058] This utility model provides a welding forming fixture. The fixture achieves high-precision curvature fitting through a customized fixture body 1, avoiding the high cost and long cycle of molding and solving the problem of irregular curved surfaces being unable to be rolled. Longitudinal limiting and endoscopic clamping are achieved using front and rear positioning blocks 2, locking bolts 6, and positioning nuts 5, ensuring the stability of the workpiece 8 during the forming process and significantly improving the surface forming accuracy. Controllable stress is applied through a hydraulic device 4 to further ensure stable fitting and avoid stress concentration caused by traditional bending and pressing. The fixture body 1 and hydraulic device 4 can be repeatedly installed and used to adapt to workpieces of different sizes. A static support plate 7 is adopted to avoid the springback effect after hydraulic release, ensuring the final shape is accurate and stable.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A welding forming tooling, characterized in that, include: The main body of the tooling, on which the workpiece to be welded is placed; The positioning blocks are welded to the front and rear ends of the tooling body, and the positioning blocks abut against the end face of the workpiece to be welded. The gantry frame, in the shape of an inverted U, spans the left and right ends of the main body of the tooling and can move back and forth along the main body of the tooling; A hydraulic device is located at the bottom middle of the gantry frame and is used to apply pressure to the workpiece to be welded so that it fits and presses against the tooling body. The welding device welds and fixes the workpiece to be welded, which is pressed against the main body of the tooling, to the main body of the tooling to obtain a shaped workpiece.

2. The welding forming fixture according to claim 1, characterized in that: The tooling body includes: a positioning plate and reinforcing ribs; Multiple positioning plates are provided, and all the positioning plates are equally spaced. The workpiece to be welded is placed on the positioning plate. Multiple reinforcing ribs are provided to fix all the positioning plates together along an arrangement direction perpendicular to the positioning plates.

3. The welding forming fixture according to claim 2, characterized in that: The positioning block is welded to the front positioning plate and the rear positioning plate of the tooling body; Multiple positioning blocks are welded to the front end of the front positioning plate of the tooling body. All the positioning blocks are spaced apart and all the positioning blocks abut against the front end face of the workpiece to be welded. Multiple positioning blocks are welded to the rear end of the rear positioning plate of the tooling body. All the positioning blocks are spaced apart and all the positioning blocks abut against the rear end face of the workpiece to be welded.

4. The welding forming fixture according to claim 3, characterized in that: A positioning nut is welded onto each of the positioning blocks to allow the locking bolt to pass through and press against the workpiece to be welded, so that the workpiece to be welded is pressed tightly against the positioning plate.

5. The welding forming fixture according to claim 1, characterized in that, Also includes: A support plate is placed on the molded workpiece to press the workpiece into shape.

6. The welding forming fixture according to claim 2, characterized in that: The gantry frame includes: a first support beam, a crossbeam, and a second support beam connected in sequence; The length of the crossbeam is greater than the length of the positioning plate; the height of the first support beam and the second support beam is greater than the height of the positioning plate.

7. The welding forming fixture according to claim 6, characterized in that: The hydraulic device is located at the bottom end of the crossbeam, and there are multiple hydraulic devices, all of which are spaced apart along the bottom end of the crossbeam.

8. The welding forming fixture according to claim 2, characterized in that: The top surface of the positioning plate has an arc-shaped structure.

9. The welding forming fixture according to claim 1, characterized in that: At least two gantry frames are provided.

10. The welding forming fixture according to claim 6, characterized in that: The gantry frame is a one-piece structure.

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