Automobile industry is one of the fastest growing and largest consumer product sector. Many of the automobile parts are made up of sheet metal. The press forming is the most feasible and cost effective method for manufacturing the automotive body panels and other sheet metal parts. Though many new techniques such as reconfigurable dies for forming, incremental sheet forming offering better flexibility are developed, none of these modern techniques is capable for mass production as required in the industries.
The production of new stamping tools get more troublesome, as the geometries get more complex and smaller tolerances on the dimensions are requested. The design of dies is the most critical and important step in obtaining a dimensionally accurate and defect free product. The project consist of simulation, die design, optimization and die manufacturing assistance for a 3 wheeler chassis Main Member. The major difficulties like springback, twisting of part, insufficient stretching, wrinkles, cracks, stress concentrations and dimensional accuracy were successfully overcome in this project work.
The software tools which were used during this project are PAM-STAMP 2G for simulation and feasibility analysis, UG-NX (Modelling, Sheet metal & manufacturing modules) for modelling and creating CNC programs and Auto CAD for drafting.
Table of Contents
1. Introduction
1.1 Overview
1.2 Objectives of project
1.3 Organization of the report
2. Literature review
3. Sheet metal forming
3.1 Sheet metal forming process
3.1.1 Hammering
3.1.2 Multipoint forming
3.1.3 Shot peen forming
3.1.4 Lase forming
3.1.5 Water jet forming
3.1.6 Spinning process
3.1.7 Incremental sheet forming
3.1.8 Stamping
3.1.9 Roll forming
3.1.10 Hydroforming
3.2 Sheet metal properties
3.2.1 Anisotropy
3.2.2 Strain hardening
3.2.3 Strain rate sensitivity
3.2.4 Young modulus
3.3 Forming limit diagram
3.4 Modes of deformation
4. Die face design and simulation
4.1 Methodology
4.2 Material
4.3 Die faced design
4.4 Inverse simulation
4.5 Forming simulation
4.5.1 Phases in sheet metal forming
4.5.2 Implicit and explicit solver
4.5.3 Setting up simulation
5. Results and discussion
5.1 Results of inverse simulation
5.2 Forming approaches
5.2.1 Develop a SPM
5.2.2 Use forming and restrike operation
5.2.3 Use top and bottom blank holder
5.2.4 Use draw operation
5.2.5 Roll forming
5.2.6 Increase the stroke
5.3 Solution adapted
5.4 Validation of results
6. Conclusions
Research Objectives and Focus Areas
The primary objective of this dissertation is to design a robust and defect-free press die for the manufacturing of a 3-wheeler chassis main member. The study focuses on integrating advanced FEA simulation techniques to predict and overcome common manufacturing challenges such as springback, wrinkling, and tearing, thereby optimizing the die face design and reducing the need for costly, time-consuming physical trial-and-error iterations.
- Simulation and optimization of the 3-wheeler chassis main member forming process.
- Comparative analysis of different forming approaches including special purpose machines, restrike operations, and draw operations.
- Implementation of die compensation algorithms for accurate springback prediction.
- Validation of simulation results using experimental data and 3D scanning.
Excerpt from the Dissertation
4.4 Inverse simulation
An inverse simulation allows the user to calculate the initial blank of the stamped part and to obtain preliminary information on the feasibility of the stamped part. The inverse simulation was carried out using PAM-STAMP inverse module.
The inverse algorithms in this software find the position of the nodes of the blank in its original, horizontal or curved surface. A displacement field is thus associated with the stamping operation considered. Inverse simulation seeks to impose the equilibrium of the final configuration of the stamped part. This is the most important simplifying assumption of the approach, which does not take into account the shapes of the blank at any other point of the stamping process. [21]
Since the process is carried out without any intermediate position, it is called one-step process. As a consequence, strain paths are assumed to be linear, and the effect of the history of deformation of the material is neglected as seen from figure 4.4. Thus we can say that this is static and nonlinear analysis. This algorithm is not suitable for parts with high undercuts.
Summary of Chapters
1. Introduction: Defines the scope, project objectives, and the organization of the research report.
2. Literature review: Provides a comprehensive overview of existing research on sheet metal forming, specifically addressing springback, wrinkling, and current simulation trends.
3. Sheet metal forming: Discusses various forming processes, fundamental sheet metal properties, and the mechanics of the Forming Limit Diagram (FLD).
4. Die face design and simulation: Details the methodologies used for die face design, including inverse simulation and setup of forming simulation phases.
5. Results and discussion: Evaluates various forming approaches for the chassis main member and presents the final simulation results and their experimental validation.
6. Conclusions: Summarizes the study's findings regarding tool design, simulation accuracy, and recommendations for future research in springback compensation.
Keywords
Sheet metal forming, Stamping, Die face design, Springback, Inverse simulation, PAM-STAMP, Wrinkling, Forming Limit Diagram, FEA, Chassis, Main member, Strain hardening, Optimization, 3-wheeler, Numerical simulation
Frequently Asked Questions
What is the core focus of this dissertation?
The thesis focuses on the simulation and design of a press die for a 3-wheeler chassis main member, aiming to minimize defects like springback and wrinkling through computer-aided engineering.
What are the primary technical challenges addressed in this research?
The main challenges identified are the S-rail shape complexity of the main member, high springback, material tearing, and wrinkling during the stamping process.
What is the main objective of the project?
The objective is to design a defect-free product by utilizing FEA simulation to optimize die face design, ensure dimensional accuracy, and reduce trial-and-error costs.
Which scientific methods and tools were employed?
The study utilizes finite element analysis (FEA) software, specifically PAM-STAMP for simulation and feasibility analysis, Siemens-NX for modeling, and portable 3D scanning for result validation.
What content does the main body cover?
The main body details the study of sheet metal forming processes, the design of die faces, the application of inverse simulation to optimize the blank, and the implementation of specific forming strategies.
What are the characterizing keywords of this study?
Key terms include Sheet metal forming, Stamping, Die face design, Springback, Inverse simulation, and 3-wheeler chassis manufacturing.
How was the springback compensation achieved?
Compensation was achieved using the PAM-STAMP die compensation module, applying a compensation factor of 0.7 in the reverse direction of the measured part deviation over several iterations.
What was the outcome of the simulation validation?
The final simulation results were validated by comparing the manufactured part deviation with simulation data using 3D scanning, which showed the results to be within an acceptable industrial range.
- Arbeit zitieren
- Amey Brahmagiri (Autor:in), 2015, Simulation and Design of Press Die for Three Wheeler Chassis Main Member, München, GRIN Verlag, https://www.grin.com/document/346502
