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Electromagnetic field assisted thick plate laser cutting device

A laser cutting, electromagnetic field technology, applied in auxiliary devices, auxiliary welding equipment, laser welding equipment, etc., can solve problems such as automatic change, processing and manufacturing, and non-adjustment.

Pending Publication Date: 2022-07-26
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The range of the magnetic field produced by the disclosed single magnetic field or electromagnetic field-assisted laser manufacturing device is fixed and non-adjustable, and the same set of devices cannot be used to process and manufacture parts of different sizes
It can only be applied to a small workbench, and the application of the gantry laser cutting machine is not considered, and the generated magnetic field or electric field is a stable electromagnetic field, which cannot automatically change over time

Method used

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  • Electromagnetic field assisted thick plate laser cutting device
  • Electromagnetic field assisted thick plate laser cutting device
  • Electromagnetic field assisted thick plate laser cutting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Refer to the attached figure 1 , this example is a conventional plate cutting example (cutting plane plate), in this example, the thickness of the workpiece is selected 5mm, first place the workpiece 104 on the stage 105, turn on the power supply, pass in direct current, adjust the current size to generate a magnetic field of 5T, Adjust the rotation angular speed to 5rad / min, generate a magnetic field, open the pneumatic device, and automatically adjust the stroke to 1800mm through the pressure sensor. Select the appropriate laser process parameters, turn on the laser, and pass in the coaxial auxiliary gas. Finally, the laser and power supply are turned off, and the workpiece cutting is completed.

Embodiment 2

[0050] Refer to the attached figure 1 , the device of this example is the same as that of Example 1. The difference between this example and Example 1 is that the thickness of the workpiece is 60mm, the current is adjusted so that the magnetic field is 20T, the angular speed of gear rotation is adjusted to 10rad / min, and the stroke is automatically adjusted to 500mm by the pressure sensor.

[0051] The invention realizes the control of the size of the magnetic field by adjusting the current size and the structural design during rotation, adjusts the threshold value of the inductor, and adapts to the size of the workpiece to be cut, thereby realizing the electromagnetic field-assisted laser cutting required for the processing of workpieces of different sizes, and improving the overall quality of cutting. , The purpose of reducing cracks in the heat affected zone and reducing the amount of slag. The invention has the characteristics of being flexible and adjustable, simple and ...

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Abstract

A thick plate laser cutting device assisted by an electromagnetic field comprises a laser head arranged on a portal frame of a gantry type cutting machine in a sliding mode, an objective table is arranged below the laser head, and a workpiece is placed on the objective table; electric field generating devices are symmetrically arranged at the two ends of the workpiece, and each electric field generating device comprises a pressure sensor, a pneumatic device, an electrode, a spring and a conductive core which are sequentially arranged in the transverse direction; magnetic field generating devices are arranged on two sides of the laser head, each magnetic field generating device comprises two planetary gear mechanisms, a large coil and four small coils are arranged between the two planetary gear mechanisms, the large coils are fixed on a large magnetic core shaft, and the small coils are fixed on a small magnetic core shaft; the two ends of the large magnetic core shaft are fixedly connected with sun gears of the corresponding planetary gear mechanisms, and the two ends of the small magnetic core shaft are fixedly connected with planetary gears of the corresponding planetary gear mechanisms. According to the invention, opposite rotation of the large and small coils is adopted to control the intensity change of the magnetic field at the plate, thereby generating different lorentz forces and realizing the sinusoidal homodromous magnetic field.

Description

technical field [0001] The invention relates to an electromagnetic field assisted thick plate laser cutting device. Background technique [0002] Laser cutting technology has the advantages of high precision, high economic efficiency and strong controllability, and is widely used in cutting workpieces. During the laser cutting process, the molten pool undergoes a process of rapid cooling and rapid heating. At the same time, due to the increase in the thickness of the plate, the cutting area is prone to cracks and other defects. In response to the above-mentioned problems in laser processing, some scholars have proposed a method of applying an external electromagnetic field to assist laser cutting. By applying the required electromagnetic field in the molten pool, the corresponding Lorentz force is formed in the molten pool to control the flow of the molten pool. Reduces cracking defects in the heat-affected zone and reduces dross during cutting. [0003] In the prior art, ...

Claims

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Application Information

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IPC IPC(8): B23K26/12B23K26/38B23K26/70B23K37/04
CPCB23K26/702B23K26/38B23K26/12B23K37/0408
Inventor 姚建华吴让大张亚周张群莉陈智君葛鸿浩郑亚风李银华
Owner ZHEJIANG UNIV OF TECH