Pipe bending machine for vehicle frame production

Abstract

This utility model discloses a tube bending machine for vehicle frame production, including a base platform and a support frame fixed on top of it. A first cylinder is mounted on the top of the support frame and is connected to a forming mold located below the support frame. The base platform has forming wheels that cooperate with the forming mold. It also includes a heating mechanism, a tube fixing mechanism, and a cooling mechanism. The heating mechanism includes a movable seat, a second cylinder, a guide rail, and an electromagnetic heating component. The movable seat is slidably mounted on the side of the base platform via the guide rail. The second cylinder drives the movable seat to move in a direction closer to and away from the tube fixing mechanism. The electromagnetic heating component is fixed on the movable seat. The movable electromagnetic heating mechanism locally heats and softens the part of the tube to be bent, reducing bending resistance. Combined with the cooling mechanism, it quickly shapes the tube, reducing material springback and surface cracks, significantly improving the bending accuracy and yield of high-hardness tubes. At the same time, the integrated process shortens the tube processing cycle.

Description

Technical Field

[0001] This utility model relates to the technical field of vehicle frame processing equipment, and in particular to a tube bending machine for vehicle frame production. Background Technology

[0002] In the field of modern bicycle frame manufacturing, the tube bending process is a core element that determines the structural strength, lightweighting, and assembly precision of the frame. Especially for vehicles such as children's bicycles and bicycles, the bending curvature of the frame tubes must strictly match the design dimensions to avoid stress concentration or assembly interference.

[0003] Pipe bending equipment often employs cold bending forming technology, using molds to press and bend or roll forming to achieve plastic deformation of the pipe. For example, patent CN 217369917 U discloses a pipe bending machine for processing children's bicycle frames, including a worktable, a hydraulically driven bending block and a rotating wheel cooperation structure. It also uses threaded rods and pressure plates to fix the pipe, reducing processing offset through mechanical clamping, thus improving the stability of pipe bending and material utilization.

[0004] However, the aforementioned pipe bending machine still has significant defects in practical applications. Cold bending forming relies on pure mechanical force extrusion, which can easily lead to excessive springback or surface cracks in high-hardness pipes (such as titanium alloys and high-carbon steel). Utility Model Content

[0005] Purpose of the invention: The purpose of this utility model is to provide a tube bending machine for vehicle frame production. It uses a movable electromagnetic heating mechanism to locally heat and soften the part of the tube to be bent, thereby reducing bending resistance. Combined with a cooling mechanism, it can quickly shape the tube, reduce material springback and surface cracks, significantly improve the bending accuracy and yield of high-hardness tubes, and shorten the tube processing cycle through an integrated process.

[0006] Technical solution:

[0007] A tube bending machine for vehicle frame production includes a base platform and a support frame fixed to its top. A first cylinder is mounted on the top of the support frame and is connected to a forming mold located below the support frame. The base platform has forming wheels that cooperate with the forming mold. The machine also includes a heating mechanism, a tube fixing mechanism, and a cooling mechanism. The heating mechanism includes a movable seat, a second cylinder, a guide rail, and an electromagnetic heating assembly. The movable seat is slidably mounted on the side of the base platform via the guide rail. The second cylinder drives the movable seat to move in a direction closer to and away from the tube fixing mechanism. The electromagnetic heating assembly is fixed to the movable seat.

[0008] Furthermore, the pipe fixing mechanism includes a support, a clamping plate, and a third cylinder for driving the clamping plate to move, and the support and the clamping plate form a clamping space for the pipe.

[0009] Furthermore, the top of the support is provided with multiple sets of positioning grooves in parallel, and the inner surface of the grooves is provided with anti-slip texture.

[0010] Furthermore, the cooling mechanism includes multiple air-cooled nozzles, which are connected to cooling air source pipelines.

[0011] Furthermore, the air-cooled nozzles are arranged at the lower end of the movable base.

[0012] Furthermore, the electromagnetic heating assembly includes an electromagnetic induction coil wound with a hollow copper tube and a power module. The inner diameter of the electromagnetic induction coil is 5-10 mm away from the tube to be processed, and the surface is covered with a ceramic fiber insulation layer. The number of electromagnetic induction coils is the same as that of the positioning groove.

[0013] Furthermore, the two ends of the forming wheel are detachably connected to the base platform via threads.

[0014] Beneficial effects: The movable electromagnetic heating mechanism locally heats and softens the part of the pipe to be bent, reducing bending resistance. Combined with the cooling mechanism, it quickly shapes the pipe, reducing material springback and surface cracks. This significantly improves the bending accuracy and yield of high-hardness pipes, while the integrated process shortens the pipe processing cycle. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention;

[0016] Figure 2 This is a three-dimensional representation of the cross-section of this utility model. Figure 1 ;

[0017] Figure 3 This is a three-dimensional representation of the cross-section of this utility model. Figure 2 ;

[0018] Figure 4 This is a three-dimensional representation of the cross-section of this utility model. Figure 3 . Detailed Implementation

[0019] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example 1

[0021] like Figure 1-4As shown, a tube bending machine for vehicle frame production includes a base platform 1 and a top-fixed support frame 2. A first cylinder 3 is mounted on the top of the support frame 2, and the first cylinder 3 is connected to a forming mold 4 located below the support frame. The base platform 1 has forming wheels 5 that cooperate with the forming mold 4. The machine also includes a heating mechanism 6, a tube fixing mechanism 7, and a cooling mechanism 8. The heating mechanism 6 includes a movable seat 61, a second cylinder 62, a guide rail 63, and an electromagnetic heating assembly 64. The movable seat 61 is slidably mounted on the side of the base platform 1 via the guide rail 63. The second cylinder 62 drives the movable seat 61 to move towards and away from the tube fixing mechanism 7. The electromagnetic heating assembly 64 is fixed to the movable seat 61. The heating mechanism 6 achieves localized heating and softening of the tube before bending. The second cylinder 62 drives the movable seat 61 to move along the guide rail 63, aligning the electromagnetic heating assembly 64 with the part to be bent. The electromagnetic induction coil is made of hollow copper tube. When a high-frequency current (20-50kHz) is passed through it, an alternating magnetic field is generated, which forms eddy currents inside the tube and heats the tube. This significantly reduces the yield strength of the material, reduces the forming force required for bending, and avoids cracking and springback problems during cold bending.

[0022] Furthermore, the pipe fixing mechanism 7 includes a support 71, a clamping plate 72, and a third cylinder 73 for driving the clamping plate to move. A clamping space for the pipe is formed between the support 71 and the clamping plate 72. The third cylinder 73 drives the clamping plate 72 to move vertically, forming a rigid clamping effect on the pipe with the support 71. Uniform clamping force is provided through pneumatic control, ensuring no displacement of the pipe during heating and bending.

[0023] Furthermore, the top of the support 71 is provided with multiple sets of positioning grooves 711 in parallel, and the inner surface of the grooves is provided with anti-slip texture. The width and depth of the positioning grooves 711 are designed according to the pipe specifications, and the anti-slip texture adopts a cross grid structure, which increases the static friction coefficient between the pipe and the support 71 and effectively prevents the pipe from sliding during bending.

[0024] Furthermore, the cooling mechanism 8 includes a plurality of air-cooled nozzles 81, and the air-cooled nozzles 81 are connected to cooling air source pipelines.

[0025] Furthermore, the air-cooled nozzles 81 are arranged at the lower end of the movable base 61.

[0026] Furthermore, the electromagnetic heating assembly 64 includes an electromagnetic induction coil 641 wound around a hollow copper tube and a power module 642. The inner diameter of the electromagnetic induction coil is 5-10 mm away from the tube to be processed, and its surface is covered with a ceramic fiber insulation layer. The number of electromagnetic induction coils is the same as that of the positioning slots 711. Maintaining a uniform gap between the inner diameter of the electromagnetic induction coil and the tube ensures a uniform magnetic field distribution and controls the heating temperature difference within ±20℃. The ceramic fiber insulation layer (1-2 mm thick) is heat-resistant up to 1200℃, preventing short circuits between the coil and the high-temperature tube, while reducing heat radiation loss by more than 90% and improving heating efficiency. The multi-coil design allows for simultaneous heating of multiple tubes or complex-shaped tubes, meeting the needs of mass production.

[0027] Furthermore, the two ends of the forming wheel 5 are detachably connected to the base platform 1 by threads.

[0028] Working principle:

[0029] Pipe positioning and clamping: The pipe is placed in the positioning groove 711 of the support 71, and the third cylinder 73 drives the clamping pressure plate 72 to descend, clamping the pipe to the set pressure.

[0030] Heating preparation: The control system calls the preset heating parameters (temperature, power, time) according to the material of the pipe (such as aluminum alloy, carbon steel). The second cylinder 62 drives the moving seat 61 to move along the guide rail 63, so that the electromagnetic induction coil is aligned with the part to be bent.

[0031] Local heating: The power module inputs a high-frequency current to the electromagnetic induction coil, and the pipe is rapidly heated to the target temperature in the alternating magnetic field and held for 2-5 seconds until thermal equilibrium is reached.

[0032] Rapid bending: After heating is completed, the moving seat 61 returns to the standby position, the first cylinder 3 drives the forming mold 4 to press down, and the tube is bent under the action of the forming mold 4 and the forming wheel 5.

[0033] Cooling and shaping: The second cylinder 62 drives the moving seat 61 to move along the guide rail 63, and the air cooling nozzle 81 is activated simultaneously. The high-speed airflow forces the bending part to cool it down, and the temperature drops rapidly within 2-3 seconds, reducing springback and increasing the material strength.

[0034] Unloading and resetting: The forming mold 4 rises, the clamping plate 72 is released, the workpiece is removed, and the equipment is reset to prepare for the next cycle.

[0035] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A tube bending machine for vehicle frame production, comprising a base platform (1) and a support frame (2) fixed to its top, wherein a first cylinder (3) is mounted on the top of the support frame (2), the first cylinder (3) is connected to a forming mold (4) located below the support frame, and a forming wheel (5) cooperating with the forming mold (4) is provided inside the base platform (1), characterized in that, It also includes a heating mechanism (6), a pipe fixing mechanism (7), and a cooling mechanism (8). The heating mechanism (6) includes a movable seat (61), a second cylinder (62), a guide rail (63), and an electromagnetic heating component (64). The movable seat (61) is slidably mounted on the side of the base platform (1) via the guide rail (63). The second cylinder (62) drives the movable seat (61) to move in the direction closer to and away from the pipe fixing mechanism (7). The electromagnetic heating component (64) is fixed on the movable seat (61).

2. The tube bending machine for vehicle frame production according to claim 1, characterized in that, The pipe fixing mechanism (7) includes a support (71), a clamping plate (72), and a third cylinder (73) for driving the clamping plate to move. The support (71) and the clamping plate (72) form a clamping space for the pipe.

3. A tube bending machine for vehicle frame production according to claim 2, characterized in that, The top of the support (71) is provided with multiple sets of positioning grooves (711), and the inner surface of the grooves is provided with anti-slip texture.

4. A tube bending machine for vehicle frame production according to claim 1, characterized in that, The cooling mechanism (8) includes a plurality of air-cooled nozzles (81), and the air-cooled nozzles (81) are connected to cooling air source pipes.

5. A tube bending machine for vehicle frame production according to claim 4, characterized in that, The air-cooled nozzles (81) are arranged at the lower end of the movable base (61).

6. A tube bending machine for vehicle frame production according to claim 1, characterized in that, The electromagnetic heating assembly (64) includes an electromagnetic induction coil wound with a hollow copper tube and a power supply module. The inner diameter of the electromagnetic induction coil is 5-10 mm away from the tube to be processed. The surface is covered with a ceramic fiber insulation layer. The number of electromagnetic induction coils is the same as that of the positioning groove (711).

7. A tube bending machine for vehicle frame production according to claim 1, characterized in that, The two ends of the forming wheel (5) are detachably connected to the base platform (1) by threads.

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