Sheet micro-forming method and device

Abstract

The invention relates to a sheet micro-forming method and device and applies to the technical field of micro-forming of plates. The method includes: controlling an evacuating device to evacuate an upper cavity and a hole in a micro-die by a computer; controlling an electromagnetic coil to discharge by a controller; allowing electromagnetic force from discharging to drive a metal plate to drive an elastic medium above to move up; allowing the elastic medium moving up to squeeze a liquid medium which is incompressible and which is hermetically arranged above the elastic medium; allowing a workpiece to plastically deform when stressed between the liquid medium and the micro-die, so as to reproduce the shape of the micro-die; allowing the elastic medium to bounce back to drive the metal plate to its original place. The workpiece can be multiply repeatedly machined into shapes by changing the workpiece. The invention further discloses the sheet micro-forming device. The sheet micro-forming method and device is high in forming efficiency, good in forming quality and applicable to low-cost batch production of micro devices.

Description

technical field [0001] The invention relates to the technical field of micro-forming, in particular to a thin-plate micro-forming method and device. Background technique [0002] Hydroforming refers to a plastic processing technology that uses liquid as a force transmission medium or a mold to shape a workpiece, also known as hydroforming. As a forming method, hydroforming has the following advantages: First, only the die or punch is needed, and the liquid medium is used as the punch or die accordingly, which saves the general mold cost and processing time, and the liquid can be used as a punch to form a lot Complicated parts that cannot be formed by rigid molds; secondly, liquid as a force transmission medium has real-time controllability, and the hydraulic closed-loop servo system and computer control system can accurately control the pressure according to a given curve to ensure that the process parameters are within the set value. And it can be changed and adjusted at a...

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Problems solved by technology

For example, the patent CN2510196Y discloses a metal sheet hydroforming die device, which is suitable for the net shape production of complex thin sheet parts such as body panels of small batches and multiple models, and is also suitable for the net shape production of metal sheet parts, but the forming process requires convex Dies and dies increase production costs; patent CN1817501A discloses a hydroforming device and a hydroforming method, which can form thin plates into complex shapes and can effectively prevent wrinkles; patent CN102083565A proposes a hydroforming processing method and hydroforming processed products , the purpose is to hydraulically process the hydroformed product with a long expansion area without remaining buckling and wrinkles, and make the internal pressure reach a certain pressure value through three processes, so as to obtain the finished product. The process is relatively complicated, and the internal The pressure is not easy to control; the patent CN1559719A proposes a metal sheet hydroforming method and its mold device, which can be used to form parts with necks and sheet metal parts with complex shapes and large deformations. The liquid is hydraulic oil. The cost is relatively high, and it is only suitable for macroscopic forming; patent CN102740991A discloses a hydroforming method and a hydroforming device, by supplying forming liquid to the inside of the blank tube arranged in the mold to load the internal pressure, and load the compressive load along the direction of the tube axis , to obtain the hydroforming method and hydroforming device of hydroformed products, but it is only suitable for forming tubular parts

[0004] From the above, it can be seen that people have begun to apply hydraulic pressure to plastic forming, but it has not involved the use of hydroforming technology to replicate micro features on micro devices

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