Intelligent Fixtures for the Manufacturing of Low Rigidity Components by Hans Christian Moehring Petra Wiederkehr Oscar Gonzalo & Petr Kolar

Author:Hans Christian Moehring, Petra Wiederkehr, Oscar Gonzalo & Petr Kolar
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

5. Case Study 2.2: Clamping of Thin-Walled Curved Workpieces

Petr Kolar1 , Jiri Sveda1 and Jan Koubek1

(1)Research Center of Manufacturing Technology (RCMT), Czech Technical University in Prague, Prague, Czech Republic

Petr Kolar (Corresponding author)

Email: [email protected]

Jiri Sveda

Email: [email protected]

Jan Koubek

Email: [email protected]

Abstract

Thin-walled curved workpieces are typical for structural parts of airplanes. The issue in the workpiece clamping and subsequent machining is the changeable workpiece stiffness during material removal. The fixture forces and the cutting forces deform the workpiece with dependence on the part decreasing static stiffness that causes large local surface location errors of the part. As a result, the workpiece wall thickness is out of tolerance and consequently the part’s weight is also out of tolerance. The proposed solution is based on new fixtures with integrated support and clamping function. The workpiece is clamped using a vacuum. A suitable thickness measurement sensor was integrated into the machine tool. The new fixture elements are autonomous and plug-and-produce ready, with integrated safety by monitoring the minimal workpiece clamping force. The fixture control enables fully automated operation using the specific control software. The machining process was optimized in terms of tool path strategy and cutting conditions to avoid chatter during machining and shorten the production time. The proposed manufacturing process leads to a shortening of the production time with the requested surface quality. The presented manufacturing procedure is beneficial from the productivity and cost point of view. A group of fixtures, including the necessary harness and control, offers a universal possibility for replacing a set of six specific fixtures designed as a mould with part negative shape.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.