Optimal process planning for laser forming of doubly curved shapes

2002 ◽  
Author(s):  
Chao Liu ◽  
Y. Lawrence Yao ◽  
Vijay Srinivasan
Keyword(s):  
Process Planning ◽  
Laser Forming ◽  
Optimal Process ◽  
Doubly Curved

Optimal Process Planning for Laser Forming of Doubly Curved Shapes

2004 ◽  
Vol 126 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Chao Liu ◽  
Y. Lawrence Yao ◽  
Vijay Srinivasan
Keyword(s):  
Process Planning ◽  
Laser Scanning ◽  
Industrial Applications ◽  
Laser Forming ◽  
Field Calculation ◽  
Heating Condition ◽  
Scanning Velocity ◽  
Optimal Approach ◽  
Doubly Curved ◽  
Practical Constraints

There has been a considerable amount of work carried out on two-dimensional laser forming. In order to advance the process further for industrial applications, however, it is necessary to consider more general cases and especially their process planning aspect. This paper presents an optimal approach to laser scanning paths and heating condition determination for laser forming of doubly curved shapes. Important features of the approach include the strain field calculation based on principal curvature formulation and minimal strain optimization, and scanning paths and heating condition (laser power and scanning velocity) determination by combining analytical and practical constraints. The overall methodology is presented first, followed by more detailed descriptions of each step of the approach. Two distinctive types of doubly curved shape, pillow and saddle shapes are focused on and the effectiveness of the proposed approach is validated by forming experiments.

A Numerical and Experimental Study of Sheet Metal Bending by Pulsed Nd:Yag Laser with DOE Method

2009 ◽  
Vol 83-86 ◽  
pp. 1076-1083 ◽  
Author(s):  
M. Hosseinpour Gollo ◽  
Hassan Moslemi Naeini ◽  
G.H. Liaghat ◽  
S. Jelvani ◽  
M.J. Torkamany
Keyword(s):  
Experimental Study ◽  
Sheet Metal ◽  
Nd:Yag Laser ◽  
Metal Forming ◽  
Flexible Manufacturing ◽  
Three Dimensional ◽  
Laser Source ◽  
Laser Forming ◽  
Beam Diameter ◽  
Doubly Curved

Metal forming by a laser source is an efficient and economical method for forming sheet metal into straight bend and doubly curved shape. It can be most useful in the automation of sheet metal forming. This paper presents an FEM model for three dimensional thermo-mechanical simulation of the laser forming. The aim of this simulation and experimental study is to identify the response related to deformation and characterize the effects of process parameters such as laser power, beam diameter, scans velocity and pulse duration, in terms of bending angle for a square sheet part. Extensive experimentation, including a design of experiments, is performed to address the above-mentioned aims. From these experiments it has been determined that laser forming using Nd:YAG laser is a flexible manufacturing process for steel sheet bending.

Study on Processing Strategy of Complicated Doubly Curved Surface in Laser Forming

2010 ◽  
Vol 37 (2) ◽  
pp. 586-592
Author(s):  
石永军 Shi Yongjun ◽  
刘衍聪 Liu Yancong ◽  
姚振强 Yao Zhenqiang ◽  
胡俊 Hu Jun
Keyword(s):  
Curved Surface ◽  
Laser Forming ◽  
Processing Strategy ◽  
Doubly Curved

Generation of Optimal Process Plan Alternatives for Manufacturing Mechanical Components

2010 ◽  
Vol 165 ◽  
pp. 250-255 ◽  
Author(s):  
Mariusz Deja ◽  
Mieczyslaw Siemiatkowski
Keyword(s):  
Process Planning ◽  
Real Life ◽  
Optimal Process ◽  
Design Data ◽  
Process Plan ◽  
Computer Aided Process Planning ◽  
Methodical Approach ◽  
Planning Problems ◽  
Process Constraints

The focus of this paper is on computer-aided process planning (CAPP) for parts manufacture in systems of definite processing capabilities, involving multi-axis machining centers. A methodical approach is developed to optimally solve for process planning problems, which consists in the identification of process alternatives and sequencing working steps. The approach involves the use of the branch and bound (B&B) concept from the field of artificial intelligence (AI). A conceptual scheme for generation of alternative process plans in the form of a network is developed, based on part design data modeling in terms of machining features. A relevant algorithm is proposed for creating such a network and searching for the optimal process plan solution from the viewpoint of its operational performance, under formulated process constraints. The use of the approach is studied numerically with regard to a real life case study and diverse machine tools with relevant tooling are considered. Generated process alternatives for complex machining with given systems are studied using models programmed in the Matlab environment.

scholarly journals Goal Driven Optimization of Process Parameters for Maximum Efficiency in Laser Bending of Advanced High Strength Steels

2015 ◽  
Vol 639 ◽  
pp. 115-122 ◽  
Author(s):  
Jonathan Griffiths ◽  
Mike J.W. Riley ◽  
Ghazal Sheikholeslami ◽  
Stuart P. Edwardson ◽  
Geoff Dearden
Keyword(s):  
Process Parameters ◽  
High Strength Steels ◽  
High Strength ◽  
Accurate Method ◽  
Maximum Efficiency ◽  
Laser Forming ◽  
Optimal Process ◽  
Laser Bending ◽  
Advanced High Strength Steels ◽  
Optimization Of Process Parameters

Laser forming or bending is fast becoming an attractive option for the forming of advanced high strength steels (AHSS), due primarily to the reduced formability of AHSS when compared with conventional steels in traditional contact-based forming processes. An inherently iterative process, laser forming must be optimized for efficiency in order to compete with contact based forming processes; as such, a robust and accurate method of optimal process parameter prediction is required. In this paper, goal driven optimization is conducted, utilizing numerical simulations as the basis for the prediction of optimal process parameters for the laser bending of DP 1000 steel. A key consideration of the optimization process is the requirement for minimal micro-structural transformation in automotive grade high strength steels such as DP 1000.

Process Design of Laser Forming for Three-Dimensional Thin Plates

2004 ◽  
Vol 126 (2) ◽  
pp. 217-225 ◽  
Author(s):  
Jin Cheng ◽  
Y. Lawrence Yao
Keyword(s):  
Process Design ◽  
Laser Scanning ◽  
Three Dimensional ◽  
Thin Plates ◽  
Laser Forming ◽  
Heat Condition ◽  
Bending Strain ◽  
Doubly Curved ◽  
Made In

Extensive efforts have been made in analyzing and predicting laser forming processes of sheet metal. Process design, on the other hand, is concerned with determination of laser scanning paths and laser heat condition given a desired shape. This paper presents an approach for process design of laser forming of thin plates with doubly curved shapes. The important feature of this method is that it first calculates the strain field required to form the shape. Scanning paths are decided based on the concept of in-plane strain, bending strain, principal minimal strain and temperature gradient mechanism of laser forming. Heating condition is determined by a lumped method. Effectiveness of the approach is numerically and experimentally validated through two different doubly curved shapes.

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