A pipe fitting roundness correcting device

Abstract

The utility model relates to pipe fitting machining technical field, concretely is a kind of pipe fitting roundness correction device, it includes press, the middle part of press is equipped with pipe fitting roundness correction mould, one side of press is equipped with the support device for the movable fixing pipe fitting to be corrected, the top of support device is equipped with the positioning rod of horizontal direction, positioning rod is installed with winding coil, when using state, winding coil is placed in pipe fitting roundness correction mould, the inner surface of pipe fitting roundness correction mould and the outer surface between winding coil are movably fixed and equipped with the pipe fitting to be corrected;Winding coil is cylindrical coil, winding coil is connected with power supply through power cord and switch and power supply.The utility model is contacted with pipe fitting inside without in the whole process of correction process device, reduces the wear and tear of pipe fitting internal surface, and electromagnetic roundness correction speed is fast, improves the efficiency of correction shape.

Description

Technical Field

[0001] This utility model relates to the field of pipe fitting processing technology, specifically to a pipe fitting rounding device. Background Technology

[0002] Currently, in the commonly used mechanical rounding method, friction between the rounding device and the inner wall of the workpiece can cause damage to the inner surface of the workpiece, especially when using a pusher extrusion method. Meanwhile, methods such as internal high-pressure rounding are complex and costly, and their efficiency decreases significantly and costs increase rapidly as the size of the fittings increases. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings in the aforementioned background technology by providing a pipe rounding device, which reduces the contact between the device and the pipe during the rounding process, reduces wear on the inner surface of the pipe, and improves the rounding efficiency.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a pipe fitting rounding device, including a press, a pipe fitting rounding mold in the middle of the press, and a support device for movably fixing the pipe fitting to be rounded on one side of the press. The support device has the following structural features: a horizontal positioning rod is provided at the top of the support device, and a wound coil is installed on the positioning rod. In use, the wound coil is placed inside the pipe fitting rounding mold, and the pipe fitting to be rounded is movably fixed between the inner surface of the pipe fitting rounding mold and the outer surface of the wound coil. The wound coil is a cylindrical coil, and the wound coil is connected to a power source via a power cord and a switch.

[0005] Furthermore, the support device includes a mold frame and a sliding sleeve, guide rail, fixing clamp, positioning baffle and positioning rod fixedly installed on the top of the mold frame.

[0006] Furthermore, the wound coil includes a mandrel, on the outer surface of which a wire is wound and fixed, and the outer surface of the wire is provided with an insulating layer. The wire is connected to a power source through a power line and a switch.

[0007] Furthermore, the mandrel is cylindrical, and a groove is formed radially on the outer surface of the mandrel.

[0008] Furthermore, the depth of the groove is 2-3 times the thickness of the wire. This facilitates the winding and fixing of the wire and the application of the insulation layer.

[0009] Furthermore, the cross-sectional shape of the conductor is rectangular, with an aspect ratio ≥ 3.5. A larger aspect ratio ensures that the width of a single-turn conductor is large enough, increasing the effective range of each coil turn, while ensuring that the cross-section of the conductor is small enough, effectively reducing heat generation and inter-turn arcing, and facilitating the subsequent coating of the insulation layer.

[0010] Furthermore, a first positioning rod hole is formed through the radial center of the mandrel, and a second positioning rod hole is formed in the radial middle of the mandrel; the outer diameter of the mandrel is D, the diameter of the first positioning rod hole is D1, the diameter of the second positioning rod hole is D2, and the distance between the center of the second positioning rod hole and the center of the mandrel is D3, where D1≥0.1D; D2≥0.1D; 1 / 3D≤D3≤1 / 2D. This ensures that the positioning rod can better withstand the reaction force during discharge.

[0011] Furthermore, the conductor is a copper conductor.

[0012] Furthermore, the number of positioning rods is two or more.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: (i) This utility model utilizes the principle of electromagnetic induction to achieve non-contact processing. The rounding process has no direct physical contact with the inner wall of the pipe, effectively avoiding friction and wear on the inner wall of the pipe caused by the traditional mechanical rounding method.

[0014] (ii) Compared with traditional mechanical and internal high-pressure rounding technology, this utility model has higher precision, and the roundness of the pipe after rounding is better than that of traditional methods. It is not limited by the length of the pipe and has a wider range of adaptability to diameter. Compared with the traditional electromagnetic flanging forming process, the coil winding method used in this rounding method is different, which can greatly improve the range of electromagnetic force and the uniformity of electromagnetic force.

[0015] (III) This utility model adopts an electromagnetic rounding method, which is pollution-free and waste-free in the processing. At the same time, the device is simple to operate and the core component coil has a long lifespan, which reduces long-term operation and maintenance costs and is in line with the concept of green manufacturing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the device of this utility model; Figure 2 This is a schematic diagram of electromagnetic circle alignment; Figure 3 This is a cross-sectional view of the mandrel; Figure 4 This is a side view of the mandrel; Figure 5 Side view of the coil being wound and the cylindrical fitting to be calibrated for electromagnetic induction. Figure 6This is a front view of the electromagnetic induction of the wound coil and the circular tube to be calibrated.

[0017] In the diagram: 1. Press; 2. Mold; 3. Winding coil; 301. Mandrel; 3011. First positioning rod hole; 3012. Second positioning rod hole; 302. Wire; 303. Insulation layer; 4. Round tube to be aligned; 5. Mold frame; 6. Sliding sleeve; 7. Guide rail; 8. Fixture; 9. Positioning baffle; 10. Positioning rod; D. Outer diameter of mandrel; D1. Diameter of first positioning rod hole; D2. Diameter of second positioning rod hole; D3. Distance between the center of second positioning rod hole and the center of mandrel. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0019] like Figure 1 As shown in Figure 6, a pipe fitting rounding device in this embodiment includes a press 1. A pipe fitting rounding mold 2 is provided in the middle of the press 1, and a support device for movably fixing the pipe fitting 4 to be rounded is provided on one side of the press 1. A horizontal positioning rod is provided at the top of the support device. In this embodiment, the number of positioning rods is two or more. A wound coil 3 is installed on the positioning rod. In use, the wound coil 3 is placed inside the pipe fitting rounding mold 2, and the pipe fitting 4 to be rounded is movably fixed between the inner surface of the pipe fitting rounding mold 2 and the outer surface of the wound coil 3. The wound coil 3 is a cylindrical coil, and the wound coil 3 is connected to a power source via a power cord and a switch.

[0020] like Figure 1 As shown, in this embodiment, the support device includes a mold frame 5 and a sliding sleeve 6, a guide rail 7, a fixing clamp 8, a positioning baffle 9, and a positioning rod 10 fixedly mounted on the top of the mold frame 5. The support device can basically adopt existing technology, and the connection relationship between its structures will not be described here.

[0021] like Figure 2 As shown, in this embodiment, the wound coil 3 includes a mandrel 301, and a wire 302 is wound and fixed on the outer surface of the mandrel 301. In this embodiment, the wire 302 is a copper wire, and an insulating layer 303 is provided on the outer surface of the wire 302. The wire 302 is connected to a power source through a power line and a switch.

[0022] like Figure 2As shown, in this embodiment, the mandrel 301 is cylindrical, and a groove is radially formed on its outer surface. The depth of the groove is 2-3 times the thickness of the wire 302. This facilitates the winding and fixing of the wire and the application of the insulating layer.

[0023] The conductor has a rectangular cross-section with an aspect ratio ≥ 3.5. This larger aspect ratio ensures a sufficiently large width for each turn of the conductor, increasing the effective range of each coil turn, while also ensuring a sufficiently small cross-section, effectively reducing heat generation and inter-turn arcing, and facilitating subsequent insulation coating.

[0024] like Figure 3 As shown, a first positioning rod hole 3011 is formed through the radial center of the mandrel 301, and a second positioning rod hole 3012 is formed in the radial middle of the mandrel 301. The outer diameter of the mandrel 301 is D, the diameter of the first positioning rod hole 3011 is D1, the diameter of the second positioning rod hole 3012 is D2, and the distance between the center of the second positioning rod hole 3012 and the center of the mandrel 301 is D3, where D1 ≥ 0.1D; D2 ≥ 0.1D; 1 / 3D ≤ D3 ≤ 1 / 2D. This ensures that the positioning rod can better withstand the reaction force during discharge.

[0025] Electromagnetic rounding is a method of rounding a pipe by passing a pulsed current through a coil, which induces eddy currents on the inner surface of the pipe through electromagnetic induction, thereby generating an electromagnetic force to rapidly expand the pipe's circle. The electromagnetic rounding process includes steps such as energizing, induction, and rounding. A single rounding operation takes an extremely short time, completed on the order of microseconds.

[0026] The device used in this embodiment includes the following steps: preliminary preparation, tooling assembly, positioning, and discharge calibration.

[0027] The electromagnetic rounding method implemented here differs from the traditional electromagnetic forming technology for pipe fittings, which uses a flat coil wound horizontally perpendicular to the pipe fitting's axis. Instead, it employs a cylindrical coil wound progressively along the pipe fitting's axial direction, with the conductor evenly wound on the mandrel. This ensures that the electromagnetic force is evenly distributed along the pipe fitting's axial direction, effectively avoiding the uneven distribution of electromagnetic force found in flat coils. Furthermore, it significantly increases the effective range of action when using conductors of equal quality, allowing the coil to generate sufficient electromagnetic force to deform the pipe fitting with only one or two layers of coil winding.

[0028] In use, first determine the diameter of the winding coil based on the inner diameter of the tube to be calibrated, and then assemble the coil, guide rail, mold stand, and die. Select a mold stand with a matching height, determine the position of the winding coil at the end of the tube to be calibrated, and perform discharge calibration. After discharge, move the tube to the next position and perform discharge calibration again, and so on, until the inner wall of the tube to be calibrated is complete. The wire is wound on the mandrel, and after winding, the entire coil is mounted on the positioning shaft, placing it at the center of the tube and keeping it coaxial with the tube. Use a press to apply sufficient pressure to the die to prevent the reaction force from displacing the die. Start the first discharge from one end of the tube, and then use a clamp to move the tube along the gap between the die and the coil to the next calibration position, and discharge again. Repeat this "movement-discharge" process until the entire tube is calibrated.

[0029] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0030] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A pipe fitting rounding device, comprising a press (1), wherein a pipe fitting rounding mold (2) is provided in the middle of the press (1), and a support device for movably fixing the pipe fitting (4) to be rounded is provided on one side of the press (1), characterized in that, The top of the support device is provided with a horizontal positioning rod (10), and a winding coil (3) is installed on the positioning rod (10). In use, the winding coil (3) is placed inside the pipe fitting rounding mold (2). The pipe fitting to be rounded (4) is movably and fixedly inserted between the inner surface of the pipe fitting rounding mold (2) and the outer surface of the winding coil (3). The winding coil (3) is a cylindrical coil, and the winding coil (3) is connected to the power supply through a power line and a switch.

2. The pipe fitting rounding device according to claim 1, characterized in that, The support device includes a mold frame (5) and a sliding sleeve (6), a guide rail (7), a fixing clamp (8), a positioning baffle (9), and a positioning rod (10) fixed on the top of the mold frame (5).

3. The pipe fitting rounding device according to claim 1, characterized in that, The wound coil (3) includes a spindle (301), and a wire (302) is wound and fixed on the outer surface of the spindle (301). An insulating layer (303) is provided on the outer surface of the wire (302). The wire (302) is connected to a power source through a power line and a switch.

4. The pipe fitting rounding device according to claim 3, characterized in that, The mandrel (301) is cylindrical, and the outer surface of the mandrel (301) has a groove along the radial direction.

5. A pipe fitting rounding device according to claim 4, characterized in that, The depth of the groove is 2-3 times the thickness of the wire (302).

6. A pipe fitting rounding device according to claim 3, characterized in that, The cross-sectional shape of the conductor (302) is rectangular, and the aspect ratio of the cross-section is ≥3.

5.

7. A pipe fitting rounding device according to claim 3, characterized in that, The spindle (301) has a first positioning rod hole (3011) through its radial center and a second positioning rod hole (3012) through its radial center. The outer diameter of the spindle (301) is D, the diameter of the first positioning rod hole (3011) is D1, the diameter of the second positioning rod hole (3012) is D2, and the distance between the center of the second positioning rod hole (3012) and the center of the spindle (301) is D3. D1≥0.1D; D2≥0.1D; 1 / 3D≤D3≤1 / 2D.

8. A pipe fitting rounding device according to claim 3, characterized in that, The conductor (302) is a copper conductor.

9. A pipe fitting rounding device according to any one of claims 1-8, characterized in that, The number of positioning rods (10) is two or more.

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