Method and device for forming plates through gradual approximation bending

Abstract

The invention discloses a method and a device for forming plates through gradual approximation bending on a three-dimensional numerical control plate bending machine (1). The method comprises the following steps of: performing targeted iteration gradual approximation bending by utilizing a resilience rule of a plate (5), comparing a shape of an actually formed curved surface B of the plate (5) subjected to pressing resilience with a shape of a theoretical target curved surface S through online measurement, and setting an approximation bending pressing curved surface C for limited approximation pressing according to an error offset value h after resilience. By the device, an online laser three-dimensional coordinate measuring instrument (4) connected with a computer is arranged on the three-dimensional numerical control plate bending machine (1). Complex mechanical calculation is not needed, the problem of bending resilience of a ship plate can be rapidly solved on line in real time, as long as the approximation bending pressing is performed for 1 to 3 times generally, the requirement on machining accuracy can be met, the problem of resilience of a numerically controlled bent plate is rapidly and effectively solved, the forming accuracy of a three-dimensional curved surface ship plate is guaranteed, and the method and the device have simple and rapid effects.

Description

1. Technical field: [0001] The present invention relates to a sheet metal forming method and device for gradually approaching bending, in particular to a sheet forming method for gradually approaching bending that is mainly used for sheet forming on a three-dimensional numerical control bending machine, and provides a matching device. 2. Background technology: [0002] With the rapid development of my country's economy, the shipbuilding industry is also developing rapidly. During shipbuilding, most of the hull's outer plate components are curved surfaces. The manufacture of three-dimensional curved plate parts is an important link. CNC bending machine is an important mechanical processing device. In the existing three-dimensional curved panel forming, although the precision and high quality of the workpiece stamped by the integral mold are only suitable for mass production, and the price is expensive; it can only be used for some small ships that are shaped. Therefore, the ...

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Problems solved by technology

[0004] Now some people are studying the problem of theoretical calculation and prediction of springback of three-dimensional bent plates. Not only is the calculation process lengthy and accurate calculation is difficult, but it is also difficult to meet the requirements of fast and real-time processing of ship plates.

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