Shaping tool used after pipe body drawing

Abstract

The utility model relates to a shaping tool used after drawing of a pipe body, which comprises two fixing rings positioned in the pipe body, a diameter expanding ring positioned between the two fixing rings, and a conical diameter expanding shaft penetrating through the diameter expanding ring, and the diameter expanding ring comprises a plurality of diameter expanding fan petals uniformly distributed along the circumferential direction. According to the utility model, pipe bodies are subjected to diameter-expanding shaping through the diameter-expanding shaft and the diameter-expanding fan petals, the device can be suitable for pre-welding shaping of different sizes by replacing the diameter-expanding fan petals, the problem of poor universality of a welding tool is solved to a certain extent, and meanwhile, due to the arrangement of the shaping tool, the coaxiality of the two pipe bodies is ensured, so that the dislocation phenomenon is avoided; through the arrangement of the long holes, the diameter-expanding fan petals are positioned in the axial direction, and meanwhile the diameter-expanding fan petals are guided to move in the radial direction. When the pipe body is welded, the shaping groove can support base metal melted during welding, so that welding holes are prevented from being formed, after welding is completed, the fixing ring and the diameter expanding ring are pushed to move in the axial direction of the pipe body, and therefore diameter expanding shaping of the whole pipe body is achieved.

Description

Technical Field

[0001] This utility model relates to the field of shaping and welding, and more particularly to the field of tube shaping and welding technology, specifically referring to a shaping tooling used after tube drawing. Background Technology

[0002] Aluminum alloys, due to their light weight, high specific strength, good plasticity, ease of processing, and corrosion resistance, are widely used in aerospace, power equipment, vehicle manufacturing, pressure vessels, and other fields. Welding is an important processing method for joining metals. Compared with iron, aluminum has strong oxidizing properties, a low melting point, rapid thermal conductivity, a large coefficient of linear expansion, and a large latent heat of fusion, which brings a series of difficulties to welding work. Welding is greatly affected by temperature and humidity, and is prone to welding defects such as burn-through, porosity, incomplete penetration, and undercut, resulting in a high rework rate. Therefore, pre-welding cleaning and shaping are particularly important.

[0003] Traditional weld seam shaping primarily involves manual shaping and tooling shaping. Manual shaping mainly uses methods such as heating and hammering, which is time-consuming, labor-intensive, noisy, and produces poor shaping results. Tooling shaping is suitable for parts with fixed shapes and sizes; when dimensions change, the tooling needs to be remade, resulting in poor versatility. In manual TIG welding, slight misalignments during pre-weld shaping can be corrected promptly by skilled personnel, preventing weld defects. However, in automated TIG welding, it is difficult for personnel to detect and correct misalignments in areas where shaping is inadequate in a timely manner, leading to frequent defects such as burn-through and high rework rates. Therefore, automated TIG welding places stricter requirements on shaping. To improve welding automation, adopting welding tooling to solve the weld seam shaping problem is urgently needed.

[0004] The tooling provided by this invention is applicable to pre-welding shaping of different sizes. It solves, to some extent, the problem of poor versatility of welding tooling. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a shaping fixture for tubes after drawing. It uses an expansion shaft and expansion fan to expand and shape the tube. By changing the expansion fan, it can be applied to pre-welding shaping of different sizes, which solves the problem of poor versatility of welding fixtures to a certain extent. At the same time, the shaping fixture ensures the coaxiality of the two tubes, thus preventing misalignment.

[0006] This utility model is achieved through the following technical solution: a shaping tool for tube body after drawing, including two fixing rings located inside the tube body, an expanding ring located between the two fixing rings, and an expanding shaft passing through the expanding ring and forming a cone shape, wherein the expanding ring includes a plurality of expanding fan-shaped segments evenly arranged in the circumferential direction.

[0007] In use, this solution involves moving the expanding shaft axially, which in turn drives the expanding fan blades radially, thereby shaping and expanding the diameter of the pipe body. Simultaneously, another pipe body is fitted onto the expanding ring, ensuring that the two pipe bodies are coaxially aligned and guaranteeing the coaxiality of the welding between them.

[0008] Preferably, the expanded diameter fan blade has a radially extending elongated hole, and a first screw extending axially along the expanded diameter ring is provided in the elongated hole. One end of the first screw is fixed to a fixed ring, and a positioning hole for the first screw to pass through is provided on the other fixed ring. A limiting bolt for restricting the axial movement of the expanded diameter fan blade is threaded onto the first screw.

[0009] This preferred solution uses elongated holes to provide axial positioning for the expanded fan blades, while also guiding their radial movement.

[0010] Preferably, a spring is provided inside the elongated hole, located between the first bolt and the expanding shaft. This preferred solution, through the spring, provides a buffering effect while also facilitating the repositioning of the expanding fan-shaped segments.

[0011] Preferably, an arc-shaped support groove is formed on the circumferential surface of the expanded diameter fan blade. The support groove is coaxial with the expanded diameter ring, and several support grooves are connected end to end to form a shaping groove formed on the circumferential surface of the expanded diameter ring and closed in the circumferential direction.

[0012] In this preferred embodiment, the shaping groove supports the molten base material during welding, thereby preventing the formation of weld holes. After welding is completed, the fixing ring and the expanding ring are pushed to move along the axial direction of the pipe body, thereby achieving overall diameter expansion and shaping of the pipe body.

[0013] Preferably, the circumferential surface of the expansion shaft is provided with a guide groove that corresponds to the expansion fan lobes and extends along its axial direction.

[0014] This preferred solution provides a guiding function by setting a guide groove.

[0015] Preferably, a slider is provided between the guide groove and the expanded diameter fan-shaped segment, and the width of the guide groove is adapted to the width of the slider.

[0016] This preferred solution uses a slider to prevent friction between the expanding fan blades and the expanding shaft, thus providing lubrication.

[0017] Preferably, the front and rear faces of the expanded diameter fan blades are provided with pads that contact the corresponding fixing plates.

[0018] This preferred solution reduces the friction area and lowers the friction force by setting up pads.

[0019] Preferably, the expanded diameter fan petal is further provided with a gasket that covers the circumference of the expanded diameter fan petal. This preferred solution, by providing a gasket, prevents the weld from being penetrated during welding if the welding current is not properly controlled. In such cases, the expanded diameter fan petal will also be damaged by the weld penetration. Using a detachable molded gasket, only the damaged gasket needs to be replaced; the rest does not need to be replaced, reducing maintenance time, cost, and efficiency.

[0020] Preferably, the expanded diameter fan blade has weight-reducing holes.

[0021] A shaping method using a shaping fixture after tube drawing includes the following steps:

[0022] After the drawing process, the inner diameter is too small and the cross-section may be elliptical or other non-circular. That is, the radius of curvature of the tube is significantly reduced and the workpiece is elliptical. Therefore, the tube needs to be shaped and expanded during welding. The shaping fixture is placed at the welding point of the tube, and then the expansion shaft is driven to move along its axial direction, so that the expansion fan moves radially outward, thereby expanding and shaping the tube at the welding point. Then, another tube is inserted into the expansion ring so that the connection between the two tubes corresponds exactly to the shaping groove, and then welding is performed. The shaping groove will support the molten base material during welding, thereby avoiding the formation of weld holes. After welding is completed, the fixing ring and the expansion ring are pushed to move along the axial direction of the tube, thereby achieving the overall expansion and shaping of the tube.

[0023] The beneficial effects of this utility model are as follows: the pipe body is expanded and shaped by the expansion shaft and expansion fan blades. By replacing the expansion fan blades, it can be applied to pre-welding shaping of different sizes, which solves the problem of poor versatility of welding fixtures to a certain extent. At the same time, the setting of the shaping fixture ensures the coaxiality of the two pipe bodies, so that misalignment will not occur. The setting of the elongated hole provides axial positioning for the expansion fan blades, and also provides radial guidance. The shaping groove supports the molten base material during welding, thereby avoiding the formation of weld holes. After welding is completed, the fixing ring and the expansion ring are pushed to move along the axial direction of the pipe body, thereby realizing the overall expansion and shaping of the pipe body. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a side view of the expanded diameter ring structure;

[0026] Figure 3 This is a schematic diagram of the expanded diameter fan-shaped structure;

[0027] As shown in the figure:

[0028] 1. Expanding fan blade, 2. Expanding shaft, 3. Slider, 4. Spring, 5. First screw, 6. Pad, 7. Weight reduction hole, 8. Long hole, 9. Shaping groove, 10. Fixing ring, 11. Guide groove. Detailed Implementation

[0029] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0030] See attached document Figure 1-3 This utility model discloses a shaping fixture for tube body after drawing. The shaping fixture includes two fixing rings 10 located inside the tube body, an expanding ring located between the two fixing rings 10, and an expanding shaft 2 that passes through the expanding ring and is conical. The expanding ring includes a plurality of expanding fan lobes 1 evenly arranged in the circumferential direction. The number of expanding fan lobes 1 can be selected according to the actual situation.

[0031] The expanded diameter fan 1 has a radially extending elongated hole 8, and a first screw 5 extending axially along the expanded diameter ring is provided in the elongated hole 8. One end of the first screw 5 is fixed on a fixing ring 10, and the other fixing ring 10 has a positioning hole for the first screw 5 to pass through. A limiting bolt is threaded onto the first screw 5 to restrict the axial movement of the expanded diameter fan 1.

[0032] A spring 4 is provided inside the elongated hole 8, located between the first bolt and the expanding shaft 2.

[0033] The circumferential surface of the expanded diameter fan 1 is provided with an arc-shaped support groove. The support groove is coaxial with the expanded diameter ring. Several support grooves are connected end to end to form a shaping groove 9 that is opened on the circumferential surface of the expanded diameter ring and is circumferentially closed.

[0034] The circumferential surface of the expanding shaft 2 is provided with a guide groove 11 corresponding to the expanding fan 1 and extending along its axial direction. A slider 3 is provided between the guide groove 11 and the expanding fan 1. The width of the guide groove 11 is adapted to the width of the slider 3. Since the expanding shaft 2 is tapered, the width of the slider 3 is fixed. The width of the guide groove 11 is adapted to the slider 3 by increasing the thickness of the groove wall.

[0035] Both the front and rear faces of the expanded diameter fan petal 1 are provided with pads 6 that contact the corresponding fixing plates. The expanded diameter fan petal 1 is also provided with a liner covering the circumference of the expanded diameter fan petal 1. The expanded diameter fan petal 1 is provided with weight reduction holes 7.

[0036] A method for shaping a tube after drawing includes the following steps:

[0037] After the drawing process, the inner diameter is too small and the cross-section may be elliptical or other non-circular. That is, the radius of curvature of the tube is significantly reduced and the workpiece is elliptical. Therefore, the tube needs to be shaped and expanded during welding. The shaping fixture is placed at the welding point of the tube, and then the expansion shaft 2 is driven to move along its axial direction, so that the expansion fan 1 moves radially outward, thereby expanding and shaping the tube at the welding point. Then, another tube is inserted into the expansion ring so that the connection between the two tubes corresponds exactly to the shaping groove 9. Then welding is performed. The shaping groove 9 will support the molten base material during welding, thereby avoiding the formation of weld holes. After welding is completed, the fixing ring 10 and the expansion ring are pushed to move along the axial direction of the tube, thereby achieving the overall expansion and shaping of the tube.

[0038] Of course, the above description is not limited to the examples above. Technical features not described in this utility model can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A shaping fixture for tubes after drawing, characterized in that: It includes two fixed rings (10) located inside the tube, an expansion ring located between the two fixed rings (10), and an expansion shaft (2) that passes through the expansion ring and is tapered. The expansion ring includes a plurality of expansion fan lobes (1) evenly arranged in the circumferential direction.

2. The shaping fixture for tube body after drawing according to claim 1, characterized in that: The expanded diameter fan (1) has a radially extending elongated hole (8), and a first screw (5) extending axially along the expanded diameter ring is provided in the elongated hole (8). One end of the first screw (5) is fixed on a fixing ring (10), and another fixing ring (10) has a positioning hole for the first screw (5) to pass through. A limiting bolt for restricting the axial movement of the expanded diameter fan (1) is threaded onto the first screw (5).

3. The shaping fixture for tube body after drawing according to claim 2, characterized in that: A spring (4) is provided inside the elongated hole (8) between the first bolt and the expanded diameter shaft (2).

4. The shaping fixture for tube body after drawing according to claim 3, characterized in that: The circumferential surface of the expanded diameter fan (1) is provided with an arc-shaped support groove. The support groove is coaxial with the expanded diameter ring. Several support grooves are connected end to end to form a shaping groove (9) that is opened on the circumferential surface of the expanded diameter ring and is circumferentially closed.

5. The shaping fixture for tube body after drawing according to claim 1, characterized in that: The circumferential surface of the expanded diameter shaft (2) is provided with a guide groove (11) that corresponds to the expanded diameter fan (1) and extends along its axial direction.

6. The shaping fixture for tube body after drawing according to claim 5, characterized in that: A slider (3) is provided between the guide groove (11) and the expanded diameter fan (1), and the width of the guide groove (11) is adapted to the width of the slider (3).

7. The shaping fixture for tube body after drawing according to claim 1, characterized in that: The front and rear faces of the expanded diameter fan (1) are provided with pads (6) that contact the corresponding fixing plates.

8. The shaping fixture for tube body after drawing according to claim 1, characterized in that: The expanded diameter fan petal (1) is also provided with a pad that covers the circumference of the expanded diameter fan petal (1).

9. The shaping fixture for tube body after drawing according to claim 1, characterized in that: The expanded diameter fan blade (1) has a weight reduction hole (7).

Images