Cutting-downs shaping on sheet parts employing a movable clamp

Аuthors

Mironenko V. V.

Irkutsk National Research Technical University, 83, Lermontov str., Irkutsk, 664074, Russia

e-mail: mironenko_vv@istu.edu

Abstract

The possibility of the defect of an «incomplete stamping» type is demonstrated on the example of the part with the standard cutting-down. This part has a standard cutting-down, and according to the regulatory document OST 1.52468-80 should be shaped without defects. Such defects occurrence leads to the manual refinement, and, hence, to the part cost value increase. The author proposes a scheme of shaping with the movable clamp application, allowing avoid the above said defect. The article demonstrates this scheme application for producing the parts with non-standard cutting-downs. It demonstrates also the scheme of shaping with the movable clamp, and describes the route of the part shaping to obtain the maximum effect from the suggested technology application. The author shows on the model parts that only the movable clamp application allows avoid the defects of “incomplete stamping” and “corrugation forming” type. The model parts were selected from the regulatory document OST 1.52468-80 zones, in which the part should come out with the defects. However, a movable clamp application for shaping allowed avoid defects such as “incomplete stamping” and “corrugation forming”.

For all three parts, a finite element analysis was performed with the PAM-STAMP 2G simulation program of the French ESI Group company. Actual tests with the INRTU experimental installation and the QFC1.2×3 industrial press were performed according to the simulation results.

The purpose of the article consists in improving the conventional technological process of producing the parts with the cutting-down element. The article solves the following tasks:

replacing the unstable forming method with a newer one:

• elimination of «incomplete stamping» and «corrugation forming» defects while the cutting-downs formation;

• expanding the possibilities of parts manufacturing with the cutting-downs through the non-standard cutting-downs application;

• ensuring the cutting-down formation with specified sizes that do not require manual finishing.

As a result, a technology for cutting-downs shaping with a movable clamp has been found that allows stably producing of the flawless parts with both standard cutting-downs, and cutting-downs that go beyond the normative documentation recommendations. The technology is universal, and it can be employed at various aircraft-and machine building enterprises.

Keywords:

elastic forming, sheet-metal forming, cutting-down

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