scholarly journals Calculating the gravity-free shape of sheet metal parts

2021 ◽  
Author(s):  
Felix Claus ◽  
Hans Hagen ◽  
Bernd Hamann
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Sheet Metal ◽  
Optical Measurement ◽  
Aerospace Industry ◽  
Normal Direction ◽  
Cad Model ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Stress Free State

AbstractThis paper presents an iterative finite element (FE)–based method to calculate the gravity-free shape of nonrigid parts from an optical measurement performed on a non-over-constrained fixture. Measuring these kinds of parts in a stress-free state is almost impossible because deflections caused by their weight occur. To solve this problem, a simulation model of the measurement is created using available methods of reverse engineering. Then, an iterative algorithm calculates the gravity-free shape. The approach does not require a CAD model of the measured part, implying the whole part can be fully scanned. The application of this method mainly addresses thin, unstable sheet metal parts, like those commonly used in the automotive or aerospace industry. To show the performance of the proposed method, validations with simulation and experimental data are presented. The shown results meet the predefined quality goal to predict shapes within a tolerance of ± 0.05 mm measured in surface normal direction.

Simplifying the Development and Usage of Fixtures for Sheet Metal and Composite Aircraft Parts

1998 ◽  
Vol 122 (2) ◽  
pp. 370-373
Author(s):  
Daniel F. Walczyk ◽  
Vinay Raju
Keyword(s):  
Sheet Metal ◽  
Practical Implementation ◽  
Cad Model ◽  
Cnc Machine ◽  
Inexpensive Method ◽  
Actual Case ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Simplified Method

Based on a survey of small- to medium-sized companies that supply sheet metal parts to the major aircraft manufacturers, there is a need for a more simplified, flexible and inexpensive method to design, fabricate and register part fixtures used for CNC post forming operations (e.g., trimming, drilling). Consequently, a method has been developed that bases fixture development completely on the CAD model, eliminates the need for datum surfaces and registration features on the CNC machine workbed, and makes fixture fabrication as easy and inexpensive as possible while still maintaining high geometrical accuracy. Practical implementation of this simplified method and an actual case study are discussed. [S1087-1357(00)00102-7]

Web-Based Application for Algorithm Based Product Development Process of Integral Bifurcated Sheet Metal Parts

2016 ◽  
Author(s):  
Thiago Weber Martins ◽  
Christian Steinmetz ◽  
Katharina Albrecht ◽  
Reiner Anderl
Keyword(s):  
Product Development ◽  
Sheet Metal ◽  
Information Exchange ◽  
Development Process ◽  
Heterogeneous Data ◽  
Product Development Process ◽  
Cad Model ◽  
Web Based ◽  
Metal Parts ◽  
Sheet Metal Parts

Within the Collaborative Research Center 666 the algorithm based product development process has been established. It is based on state of the art product development methodologies and enhanced in order to optimize the product development process of integral bifurcated sheet metal parts. Algorithms based on mathematical optimization approaches as well as the initial product requirements and constraints information are applied to obtain an optimized design as CAD-Model. Regarding this methodology there are still some challenges to be solved, such as reduction of iterations steps to elaborate final product design as CAD-model, use of heterogeneous data as well as software and enhancement of information exchange. Therefore, this paper introduces a concept for a web-based application to support the algorithmic product development methodology and CAD modeling in CRC 666. It enables the development and adaptation of integral bifurcated parts based on the initial optimization data provided by XML-files. Besides the description of use cases and use scenarios, the concept is implemented as a web-based application for validation purposes. Based on the validation, advantages and limitations of the presented approach are discussed.

A Predictive Model for Tolerance Verification of Bent Sheet Metal Parts

2011 ◽  
Vol 473 ◽  
pp. 516-523
Author(s):  
Thi Hong Minh Nguyen ◽  
Joost R. Duflou ◽  
Jean Pierre Kruth
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Predictive Model ◽  
Sheet Metal ◽  
Dimensional Accuracy ◽  
Complete Model ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Tolerance Verification ◽  
Specific Part

This paper presents a complete model including method and result for tolerance verification of bent sheet metal parts. The method uses a mathematical model to take into account aspects influencing the dimensional accuracy of linear and angular dimensions of bent parts. The model was implemented using a set of experimental data to estimate the dimensional accuracy for dimensions of interest of a specific part. Comparing the prediction data with the measured results allowed validation of the model.

Experimental Researches Regarding Strain Measurement of Incrementally Formed Sheet Metal Parts Done Using an Industrial Robot

2014 ◽  
Vol 555 ◽  
pp. 300-305
Author(s):  
Ionut Chera ◽  
Octavian Bologa ◽  
Gabriel Racz ◽  
Radu Breaz
Keyword(s):  
Sheet Metal ◽  
Strain Measurement ◽  
Optical Measurement ◽  
Incremental Forming ◽  
Industrial Robot ◽  
Program Code ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Steel Sheets ◽  
Experimental Researches

This paper aims to provide results regarding the measurement of the strains in the material of sheet metal parts which have been incrementally formed. The incremental forming of the steel sheets has been performed with the aid of a KUKA KR 6 industrial robot on a specially constructed stand, and the measurement of the strains has been done using ARAMIS optical measurement system. The trajectory of the forming punch which is attached to the robot was designed using CATIA V5 and the movements of the robot were designed and simulated in DELMIA software. DELMIA generated the program code needed for the robot to execute the desired movements in order to form the sheet metal parts.

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