An energy control method for reducing warpage in laser bending of thin metal plates

Abstract

The invention belongs to the technical field of metal sheet laser bending forming, and relates to an energy regulation and control method for reducing the bending amount of a metal sheet laser bendingforming. In the invention, a method combining three-stage variable speed with local energy compensation is adopted for correcting a warping deformation, and the energy coarse adjustment is carried out by adopting a three-section variable speed mode to adopt a low speed to ensure higher energy input at the section position with small bending angle and high bending angle adopting high speed to ensure lower energy input; the energy compensation method comprises the following steps of: carrying out energy compensation on a segment position with small bending angle by scanning a local area with small bending angle for lesser times after the local energy compensation mode is processed; and the combination of the two aspects can effectively reduce the bending amount in the laser bending processof the metal sheet and meet the technical requirements. The method can be applied to the field of metal sheet forming with high angle precision required by laser non-die bending processing.

Description

technical field

[0001] The invention belongs to the field of laser bending forming of thin metal plates, and relates to an energy control method for reducing the warping amount of laser bending forming of thin metal plates. Background technique

[0002] Compared with traditional mold processing methods, laser bending forming is a flexible, moldless, force-free and non-contact rapid prototyping technology, which is easy to automate. However, the warping deformation of the free end of the metal sheet during the laser linear scanning process seriously affects the forming quality. Although the warping amount is small, in some occasions that require high precision, this deformation amount may cause a very large impact. The current research believes that there are two main reasons for the warping phenomenon: one is the non-uniform temperature field along the scanning line generated by the laser energy input; the other is that the geometric constraints on different points on the sc...

Examples

Embodiment

[0024] Embodiment: Laser linear scanning of copper-steel laminated plate warpage correction sample.

[0025] (1) Production of uncorrected samples:

[0026] ① The material of the metal sheet 2 is copper-steel laminated board. Use a shearing machine to cut the copper-steel laminated board with a thickness of 1 mm into a rectangular sample with a width of 70 mm and a length of 100 mm. In order to increase the light absorption rate, use carbon black treatment;

[0027] ② Use the clamping plate 1 to clamp one end of the sample and place it on the laser processing workbench, adjust the laser power to 100w, the frequency to 40Hz, the pulse width to 2ms, the laser scanning speed to 400mm / min, and the defocus to 8mm; figure 2 As shown, the distance 13 between the scanning line and the free end is 25 mm. Here, reciprocating scanning 12 is performed from the position of the scanning starting point 9. In order to stabilize the laser light source during sample processing, a section of i...

technical field

[0001] The invention belongs to the field of laser bending forming of thin metal plates, and relates to an energy control method for reducing the warping amount of laser bending forming of thin metal plates. Background technique

[0002] Compared with traditional mold processing methods, laser bending forming is a flexible, moldless, force-free and non-contact rapid prototyping technology, which is easy to automate. However, the warping deformation of the free end of the metal sheet during the laser linear scanning process seriously affects the forming quality. Although the warping amount is small, in some occasions that require high precision, this deformation amount may cause a very large impact. The current research believes that there are two main reasons for the warping phenomenon: one is the non-uniform temperature field along the scanning line generated by the laser energy input; the other is that the geometric constraints on different points on the sc...

Examples

Embodiment

[0024] Embodiment: Laser linear scanning of copper-steel laminated plate warpage correction sample.

[0025] (1) Production of uncorrected samples:

[0026] ① The material of the metal sheet 2 is copper-steel laminated board. Use a shearing machine to cut the copper-steel laminated board with a thickness of 1 mm into a rectangular sample with a width of 70 mm and a length of 100 mm. In order to increase the light absorption rate, use carbon black treatment;

[0027] ② Use the clamping plate 1 to clamp one end of the sample and place it on the laser processing workbench, adjust the laser power to 100w, the frequency to 40Hz, the pulse width to 2ms, the laser scanning speed to 400mm / min, and the defocus to 8mm; figure 2 As shown, the distance 13 between the scanning line and the free end is 25 mm. Here, reciprocating scanning 12 is performed from the position of the scanning starting point 9. In order to stabilize the laser light source during sample processing, a section of i...

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