Sheet laser micro-drawing forming method and device with synchro heating

Abstract

The invention discloses a plate micro deep drawing forming method by virtue of pulsed laser and with a synchronous heating function and a special device for realizing the method. The plate is clamped between a micro deep drawing die and a clamping ring, the edge zone of the plate is heated by a circular laser beam which passes through the transparent die, meanwhile, the plate is irradiated by short pulsed laser with the energy density greater than the ignition threshold of material and is shocked by plasma shock wave produced by the interaction between the laser and the material, which leads to the plastic deforming of the board and obtains a deep drawn part tallying with the shape of the die. The method is of rapid forming, can form materials which are hard to be deformed at a normal temperature and can obviously improve the performances of material such as intensity, abrasion resistance, corrosion resistance and fatigue resistance; the method is especially suitable for the deep drawing forming of micro cylinder-shaped parts made from ultrathin materials or bulge forming of miniature spherical parts made from ultrathin materials, and can be used for manufacturing structural parts of a micro electromechanical system.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing, and in particular relates to a pulse laser micro-drawing forming method with synchronous heating for ultra-thin plates and a device for realizing the method. Background technique [0002] Deep drawing is a common sheet metal forming process, which is usually completed by means of punches, dies and blank holders. However, there are many disadvantages when the traditional deep drawing method of macro parts is applied to the manufacture of micro parts. For example, the manufacture of the micro-punch is very difficult, the centering of the punch and the die and the gap guarantee are not easy, and the stroke of the punch is also difficult to control. In addition, this kind of mechanical forming by means of the relative movement of the punch and the die belongs to the quasi-static forming method, and the forming efficiency is low. Furthermore, when the material is at the micro scale, due to the ...

AI Technical Summary

Problems solved by technology

Its technical defects are as follows: 1) plate preheating and laser shock are carried out separately, and the work efficiency is low; 2) preheating is carried out after the constrained layer is applied, and for ultra-thin metal plates, heat will quickly flow to the constrained layer and concave 3) It is inconvenient to use water as the constraining layer, otherwise it will be vaporized due to preheating of the sheet; 4) For deep drawing, the process requires the edge area of ​​the sheet to be heated and softened so that it can flow into the die, and the sheet The central part of the plate should be kept cold to ensure sufficient strength without cracking, but when the patented technology preheats the plate through laser scanning, the heat will quickly flow to the central area of ​​the plate (especially for micro parts), The area that should not be heated is heated and softened, which can easily lead to the rupture of micro-drawn parts and cannot obtain a large amount of deformation; 5) It is inconvenient to use blank holders, and the sheet is easy to wrinkle during deep drawing, which affects the quality of parts

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