Selection of a technological block scheme for EH forming of various types of sheet metal parts

Zhexin Wang, Mykhaylo Taranenko, Nataliy Kobrina

Abstract


The work analyzes the range of typical large-sized sheet metal parts that are typical for sheet metal stamping production in China. These group of parts includes bottoms, box-shaped parts, stiffening panels. Such productions produce sheet metal bottoms with overall dimensions of more than 1.0 m and a thickness of 0.5…2.5 mm, which are used in the construction of aviation equipment, spacecraft for various purposes and special products. Due to the special conditions of their use, strict requirements are imposed on them regarding the accuracy of shape, dimensions and distribution of thinning deformations along the surface of the part. A complicating factor in their manufacture is the small batches of their release - from prototypes to small series.

A typical example of box-shaped parts are covers and pallets of electric batteries of various operating principles. A feature of their manufacturing processes is small batches of parts with frequent changes in configuration and dimensions.

Quite complex in shape and size are various stiffening panels, which are used in the aviation, automotive industries, as well as in the manufacture of machines and devices for food production.

Analysis of the technological features of their manufacture with the specified technical requirements allows us to conclude that it is necessary to use various stamping schemes for their shaping - stamping-extraction of the flange and stamping-forming. This allowed us to determine the main requirements for the design schemes of technological blocks.

The known and proposed designs of technological blocks of EH-presses were analyzed. A conclusion was made about the rationality of their architecture - vertical architecture with powerful hydraulic cylinders for carrying out stamping-extraction processes. At the same time, the possibility of equipping them with multi-electrode discharge blocks to control the place of the desired loading of the part was considered.

For stamping-forming operations, it is proposed to use designs that are similar to horizontal architecture presses with a short-stroke mechanism for pressing the part flanges. They should be equipped with multi-electrode discharge units that allow the realization of a large amount of stored energy (up to 2.5…3.0 MJ). Such installations allow the realization of simultaneous stamping of several parts. Examples of such processes are given.

In conclusion, reasonable conclusions are made.

Keywords


electrohydraulic forming, sheet metal parts, technological press blocks, multi-electrode discharge blocks

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References


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