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Computer Applications in Near Net-Shape Operations

Overview

The process of producing components to final net-shapes is fast becoming a desirable goal for metal working industries. This is due to a combination of factors such as the development of new materials and escalating energy costs. Computer Applications in Near Net-Shape Operations addresses the design, analysis and simulation of near net-shape operations using some of the most advanced computer techniques and tools available. Topics covered include: Sheet metal forming operations: progressive stamping, fine ...
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Overview

The process of producing components to final net-shapes is fast becoming a desirable goal for metal working industries. This is due to a combination of factors such as the development of new materials and escalating energy costs. Computer Applications in Near Net-Shape Operations addresses the design, analysis and simulation of near net-shape operations using some of the most advanced computer techniques and tools available. Topics covered include: Sheet metal forming operations: progressive stamping, fine blanking, nesting, flat pattering, bending and nibbling; Die design, construction and NC programming of wire EDM; Bulk metal forming processes such as cold upsetting and close-die forging; Injection mould design, analysis and simulation; Computer-aided design of CNC machines for near net-shape operations; Intelligent progressive die design system IPD. This collection of the latest developments from leading experts in the field will be of interest to practising engineers, graduate students and researchers of metal forming, stamping, mould and die design.
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Product Details

  • ISBN-13: 9781447111597
  • Publisher: Springer London
  • Publication date: 4/30/2013
  • Series: Advanced Manufacturing Series
  • Edition description: Softcover reprint of the original 1st ed. 1999
  • Edition number: 1
  • Pages: 322
  • Product dimensions: 6.14 (w) x 9.21 (h) x 0.72 (d)

Table of Contents

1 Introduction to near net-shape operations.- 1.1 Introduction.- 1.2 Classification of near net-shape operations.- 1.2.1 Sheet metal forming.- 1.2.2 Massive (bulk) metal forming processes.- 1.2.3 Injection moulding.- 1.2.4 Machines for near net-shape operations.- 1.3 Near net-shape operations: past, present and future.- 2 CAD/CAM for sheet metal forming and related processes.- 2.1 Introduction and basic techniques.- 2.1.1 Feature modelling of stampings.- 2.1.2 Application of expert systems to stamping die design.- 2.2 Optimisation of blank layout.- 2.2.1 Mathematical description of blank layout.- 2.2.2 The polygon method.- 2.2.3 The height function method.- 2.3 Fine blanking.- 2.3.1 Characteristics of the fine blanking process.- 2.3.2 Application of the fine blanking process.- 2.3.3 CAD/CAM of fine blanking dies.- 2.4 Progressive stamping.- 2.4.1 Software architecture of the system.- 2.4.2 Strip layout.- 2.4.3 Construction design of progressive dies.- 2.5 An overview of a flat patterning and bending simulation system.- 2.5.1 Design input module.- 2.5.2 Flat pattern development module.- 2.5.3 Bending simulation module.- 2.5.4 System details.- 2.5.5 Implementation of bending simulation module.- 2.6 CNC punching and nibbling.- 2.6.1 Computer-based system for CNC nibbling.- 2.6.2 Punch libraries.- 2.6.3 Profile classification.- 2.6.4 Punch selection and optimisation.- 2.6.5 An approach to automatic tool selection.- 2.6.6 A case study.- 2.7 Die construction design.- 2.7.1 Design of die and punch.- 2.7.2 Layout of ejectors.- 2.8 NC programming of wire EDM.- 2.8.1 Process consideration for NC programming of wire EDM.- 2.8.2 Geometric computation.- 2.8.3 NC programming procedure for wire EDM.- References.- 3 CAD/CAM for massive (bulk) metal forming.- 3.1 Introduction.- 3.2 Cold upsetting.- 3.2.1 Determination of operations and sequences.- 3.2.2 Calculation of process parameters.- 3.2.3 Design of dies cavities, general parts and combined dies.- 3.2.4 The BNC CAD system.- 3.3 Closed-die forging.- 3.3.1 Selection and calculation of bars.- 3.3.2 Determination of operations and sequences.- 3.3.3 Calculation of forging load and stress.- 3.3.4 Design of dies.- 3.3.5 Program flowchart and description.- References.- 4 CAD/CAE/CAM for injection moulding.- 4.1 Introduction.- 4.1.1 Brief history of development.- 4.1.2 Technological characteristics.- 4.2 Graphic input and geometry construction of injection moulded products.- 4.2.1 Wire-frame modelling.- 4.2.2 Surface modelling.- 4.2.3 Solid modelling.- 4.3 CAD for construction design of plastic injection moulds.- 4.3.1 Program flowchart.- 4.3.2 Standard mould base design.- 4.3.3 Cavity and core design.- 4.3.4 Runner bar design.- 4.4 Flow simulation of plastic injection moulding.- 4.4.1 One-dimensional flow analysis.- 4.4.2 Two-dimensional flow analysis.- 4.4.3 Three-dimensional flow analysis.- 4.5 Cooling simulation of plastic injection moulding.- 4.5.1 One-dimensional cooling analysis.- 4.5.2 Two-dimensional cooling analysis.- 4.5.3 Three-dimensional cooling analysis.- 4.6 CAM for plastic injection moulds.- 4.6.1 Integrated CAD/CAM system.- 4.6.2 Information transfer from CAD to CAM.- 4.6.3 Tool path generation in 2-D NC.- 4.6.4 Manufacturing for 3-D core and cavity.- 4.7 CAD/CAE/CAM system for plastic injection moulding.- 4.7.1 System configuration.- 4.7.2 CAD software functions.- 4.7.3 CAE software functions.- 4.7.4 CAM software functions.- 5 FEM applications in near net-shape operations.- 5.1 Introduction.- 5.2 FEM applications and developments in near net-shape operations.- 5.2.1 New algorithms for automatic triangular mesh generation.- 5.2.2 New algorithms for mesh rezoning in FEM simulation.- 5.2.3 Algorithms for generating isogram in FEM.- 5.2.4 Calculation of rigid regions using rigid-plastic FEM.- 5.3 FEM applications in massive (bulk) metal forming processes.- 5.3.1 Simulation of rigid-plastic finite element of radial extrusion process.- 5.3.2 Rigid-plastic finite element simulation of the upsetting-backward extrusion process.- 5.3.3 Simulation of forward extrusion and upsetting-backward extrusion process.- 5.4 FEM application in die design.- 5.4.1 Basic equations for FEM analysis of combined die and mathematical modelling of pre-stressing force.- 5.4.2 FEM solution and program flowchart.- 5.4.3 FEM analysis for combined backward extrusion die.- 5.4.4 FEM analysis for combined forward extrusion die.- 5.4.5 FEM analysis for precision forging die for blades.- 5.4.6 Optimisation design of combined dies.- 5.5 FEM application in analysis of hydraulic presses.- 5.5.1 Finite element analysis of fluid transients.- 5.5.2 Non-symmetrical frontal solution method for fluid FEM 240 References.- 6 CAE/CNC of machines for near net-shape operations.- 6.1 Introduction.- 6.2 Universal CNC systems for near net-shape operations.- 6.2.1 Composition of universal CNC control system.- 6.2.2 Intelligent control module board.- 6.2.3 Module of control software.- 6.2.4 Communication in an integrated-distributed CNC system.- 6.3 CNC for sheet metal forming machines.- 6.3.1 CNC system for shearing machines.- 6.3.2 CNC system for press brakes.- 6.4 FMC for sheet metal bending.- 6.4.1 CNC and automatic generation of system software.- 6.4.2 Bending design based on features.- 6.4.3 Manufacturability criteria for sheet metal bending FMC.- 7 IMOLD®: an intelligent mould design and assembly system.- 7.1 Introduction.- 7.2 Injection moulding.- 7.3 Computer applications in injection mould design.- 7.4 IMOLD®.- 7.4.1 IMOLD® functional modules.- 7.4.2 Design information management in IMOLD®: assembly tree.- 7.5 An example.- 7.6 Conclusions.- References.- 8 Computer applications in intelligent progressive dies design (IPD).- 8.1 Introduction.- 8.2 Overview of the computer architecture.- 8.3 Advanced knowledge-based techniques for the modelling and generation of progressive dies.- 8.3.1 A model-based reasoning (MBR) approach for die design.- 8.3.2 Shape representation and spatial reasoning techniques.- 8.3.3 A function-spatial language for the configuration of a die.- 8.4 An industrial case study.- 8.4.1 Introduction.- 8.4.2 Description of stamping.- 8.4.3 Features of the part.- 8.4.4 Modelling the part.- 8.4.5 The flat pattern.- 8.4.6 The strip layout.- 8.4.7 3-D strip layout.- 8.4.8 Configuration of the progressive die.- 8.4.9 Technical data generated by the system.- 8.5 Conclusions.
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