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Design of injection molded plastic parts /

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This book creates a new perspective on the design of plastic parts. In many books there is a strong focus on the material, the material properties, and the calculation or dimensioning. What is often not taken into account is that very many plastic components only have to withstand low loads; in very...

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Bibliographic Details
Main Author: Jaroschek, Christoph, 1959- (Author)
Corporate Author: ScienceDirect (Online service)
Format: eBook
Language:English
Published: Munich, Germany : Carl Hanser Verlag, [2022]
Subjects:
Injection molding of plastics.
Plastics > Molding.
Industrial design.
Matières plastiques > Moulage par injection.
Design.
injection molding.
TECHNOLOGY & ENGINEERING.
Industrial design
Injection molding of plastics
Plastics > Molding
Electronic books.
Online Access:Connect to the full text of this electronic book
Table of Contents:
  • Intro
  • The Author
  • Preface
  • Contents
  • 1 Plastic Parts
  • 1.1 General Information
  • 1.1.1 Comparison of Designs (Conventional vs. Plastic)
  • 1.1.2 Special Features of Plastics
  • 1.1.2.1 Comparison of the Properties of Plastics and Metals
  • 1.1.2.2 Special Mechanical Behavior
  • 1.1.3 Reasons for Using Plastics
  • 1.2 Design Rules
  • 1.2.1 Special Design Features of Injection Molded Parts
  • 1.2.1.1 Demoldability
  • 1.2.1.2 Flow Path to Wall Thickness Ratio
  • 1.2.1.3 Sprue Position
  • 1.2.1.4 Avoiding Material Accumulation, Thin Wall Thickness
  • 1.2.1.5 Stiffeners
  • 1.2.1.6 Dimensional Change due to Temperature Fluctuations
  • 1.3 Dimensional Deviations between CAD and Injection Molded Part
  • 1.3.1 Shrinkage
  • 1.3.2 Warpage
  • 1.3.3 Corrective Measures for Dimensional Deviations
  • 1.4 Design of Connections
  • 1.4.1 Screw Fasteners
  • 1.4.2 Snap-Fit Connections
  • 1.4.3 Bonding and Welding of Seams
  • 1.4.3.1 Adhesive-Bonded Joints
  • 1.4.3.2 Welded Joints
  • 1.4.3.3 Film Hinges
  • 1.5 Tolerances and Dimensions
  • 1.6 Sizing
  • 2 The Injection Molding Manufacturing Process
  • 2.1 The Process and What the Designer Should Know
  • 2.1.1 Flow Path Lengths Are Limited
  • 2.1.2 Molded Part Area Determines Machine Size
  • 2.1.3 Wall Thicknesses Determine the Cooling Time
  • 2.1.4 Plastic Shrinks as It Cools
  • 2.2 Influence of the Process on Component Properties
  • 2.2.1 Weld Lines, Meld Lines
  • 2.2.2 Surface Quality
  • 2.3 Fiber Orientations Influence the Component Dimensions
  • 2.4 Forward-Looking Quality Assurance
  • 2.4.1 Sink Marks
  • 2.4.2 Jetting
  • 2.4.3 Diesel Effect
  • 2.4.4 Incomplete Filling, Burr Formation, and Deformation during Demolding
  • 2.5 Special Injection Molding Techniques
  • 2.5.1 Multi-Component Technology
  • 2.5.1.1 General Procedure
  • 2.5.1.2 Molding Techniques
  • 2.5.1.3 Component Design
  • 2.5.2 Fluid Injection Technology (FIT)
  • 2.5.2.1 Processes
  • 2.5.2.2 Component Design
  • 3 Molds
  • 3.1 General Tasks and Functions
  • 3.2 Manufacture and Costs
  • 3.2.1 General Machining
  • 3.2.2 Surfaces
  • 3.2.2.1 EDM
  • Electrical Discharge Machining
  • 3.2.2.2 Etching
  • 3.2.2.3 Laser Texturing
  • 3.2.2.4 Ceramic Surfaces
  • 3.2.3 Steels
  • 3.3 Standard Elements
  • 3.4 Melt Feed
  • 3.4.1 Cold Runners
  • 3.4.1.1 Cavity Layout
  • 3.4.1.2 Gating to Cavities
  • 3.4.1.3 Demolding of the Runner System
  • 3.4.2 Mold with Pre-Chamber Nozzle
  • 3.4.3 Insulating Channels
  • 3.4.4 Hot Runners
  • 3.4.4.1 Internally Heated Systems
  • 3.4.4.2 Externally Heated Systems
  • 3.4.4.3 Hot Runner Nozzles
  • 3.4.4.4 Cascade Technology
  • 3.5 Temperature Control
  • 3.5.1 Concepts for Temperature Control
  • 3.5.1.1 Continuous Flow Temperature Control
  • 3.5.1.2 Pulse Cooling/Discontinuous Temperature Control
  • 3.5.1.3 Variothermal or Intermittent Temperature Control
  • 3.5.2 Implementation
  • 3.6 Demolding