Method and device for laser pulse and electromagnetic pulse composite forming of metal sheet

Abstract

The invention discloses a method and device for laser pulse and electromagnetic pulse composite forming of a metal sheet and relates to the technical field of processing and manufacturing fastening holes. The head part of an energy absorption rod (10) is a conical surface; a high-power pulse laser outputs an annular laser pulse (8) by means of a light spot regulator (15); the annular laser pulse (8) accommodates the tip part of the conical surface on the head part of the energy absorption rod (10) in a hollow part of a laser beam, and meanwhile, the annular laser pulse (8) is acted on the conical surface on the head part of the energy absorption rod (10) to induce plasma (17) to explode and generate impact waves acted on the internal walls of the fastening holes, so that the fastening holes are strengthened. The method and the device are suitable for strengthening the fastening holes with small diameter; the hollow part of the annular laser pulse (8) keeps away from the tip part of the conical surface of the energy absorption rod (10), so that the energy absorption rod (10) is difficult to damage, which is beneficial to continuously working and achieving a good strengthening effect.

Description

technical field [0001] The invention relates to the technical field of sheet metal forming, in particular to a metal sheet laser shock wave and electromagnetic pulse compound forming method and device, which is suitable for high-efficiency, complex and precise forming of large sheet metal, and is also suitable for the fine structure of sheet metal Forming is especially suitable for forming materials that are difficult or impossible to form by conventional methods, such as titanium alloys and magnesium alloys. Background technique [0002] As the main method of sheet metal forming, plastic forming of sheet metal has occupied a very important position in the entire national economy and is widely used in aerospace, shipbuilding, automotive panels, electronics, instruments and other production industries. At present, there are many methods for plastic forming of metal sheets at home and abroad, including stamping, electromagnetic forming, explosive forming, shot peening, laser t...

AI Technical Summary

Problems solved by technology

However, electromagnetic forming still has the following disadvantages: (1) The equipment consumes a lot of energy

At present, the maximum energy storage of foreign equipment is 500kJ, while that of domestic equipment is 40kJ, but it is still far from meeting the needs of processing difficult-to-deform metals or large solid metal workpieces; (2) The energy utilization rate is very low, and energy waste is serious

The utilization rate of equipment energy storage is generally 10% to 20%, and the highest is no more than 40%, which is mainly wasted on magnetic flux leakage and heat generation; (3) The cost is still high and it is not easy to popularize; (4) There are certain limitations in the electromagnetic forming process. Limitation, there are certain requirements for the material and shape of the processed parts

The current electromagnetic sheet forming methods are mostly used for processing small shell-shaped parts. For forming large-scale automobile cover parts and complex curved surface shell-shaped parts, large-scale equipment with high voltage and high energy is required. In addition, the complex and fine structure of the parts is not easy. take shape

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