Laser impact warm forming method with uniform heat and constant pressure functions and device

Abstract

The invention discloses a laser impact warm forming method with uniform heat and constant pressure functions and a device. According to the invention, a heating coil is adopted for increasing the temperature of a system, an oil pump is used for sucking cold liquid to lower the temperature of the system, so as to ensure that the temperature of the system is controlled within a pre-set temperature range; an overflow value is used for setting system pressure, the oil pump is used for sucking liquid into the cavity of a die so as to reach an appointed pressure; and laser induced impact wave is used as a power source for warm forming and enhancing to panel veneer. According to the invention, the advantages of both warm forming technique and laser impacting technique are combined, liquid is adopted for heating the panel veneer, the heating temperature is uniform and easy to control; the pressure control device is guaranteed to produce continuous back pressure so as to enable the stress to the panel veneer to be balanced. The method provided by the invention improves the forming performance of the panel veneer during laser impact forming process, and provides a novel concept to the formation of the panel veneer; and while the panel veneer is formed, the service life and stress and corrosion resisting performance of the panel veneer are improved.

Description

technical field [0001] The invention belongs to the field of laser processing, in particular to a method and device for preheating and laser shock warm forming of a sheet, and is especially suitable for forming difficult-to-form metal sheets. Background technique [0002] Laser shock forming has the characteristics of ultra-high pressure, high energy, and high strain rate. It is a composite forming technology that integrates material modification, strengthening and forming. It is especially suitable for sheets that require fatigue resistance and stress corrosion resistance. Due to the thermal barrier protection of the absorbing layer and the constraining layer, the laser will not cause thermal damage to the metal sheet; due to the precise and controllable parameters of the laser pulse energy, spot size, pulse width, and laser energy, the numerical control system can realize the control of the sheet metal. Precise control of forming. However, for some difficult-to-form she...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the temperature of laser heating is high, which is easy to cause thermal damage to the plate; the heating is uneven, the stress distribution is difficult to control, and harmful residual tensile stress will be formed on the surface of the plate; it is also impossible to achieve precise control of the system temperature , for some specific difficult-to-form materials, such as magnesium alloys, the temperature of warm forming is within a certain range, and the forming effect cannot be guaranteed by this method

The disadvantage of this method is that it is not easy to control the uniformity of the heating of the plate, and it is impossible to accurately control the temperature of the system. For some difficult-to-form materials such as magnesium alloys, the temperature of warm forming is within a narrow range. Therefore, The method does not guarantee the effect of its forming

Its disadvantages are as follows: Due to the small amount of plastic deformation of the sheet metal each time, and the local deformation of the impact zone is too large, it is easy to cause cracks, especially for difficult-to-form materials, such as magnesium alloys

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