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PLASTIC INJECTION MOLDING DESIGN & MANUFACTURE OF PLASTIC PARTS

Course Introduction

Plastic parts are found in countless big and small products today, from computers,  household goods, control and  instrumentation equipment, road vehicles, sporting goods to biomedical instruments, just to name a few. The quality and finishing of the plastic products depend on the choice of plastic material, product design, mould  design and moulding process.

This is a course of continuing education specifically designed for people who are designing and manufacturing plastic parts.

 

Course objective

  1. Plastic material selection
  2. Plastic material characteristics
  3. Plastic material applications
  4. Plastic material limitations
  5. DFM for plastic parts
  6. Measurements in plastics
  7. How to process the various types of plastic resins

 

Course Content

1. Introduction to plastic injection molding

2. Overview of plastic materials

  1. Molecular structure
  2. Group of plastics
  3. Volume versus temperature behavior
  4. Semi-crystalline materials
  5. Amorphous materials
  6. Viscosity
  7. vii. PVT diagram
  8. viii. Fountain and skin effect
  9. Molecular orientation and relaxation
  10. Additives
  11. Shrinkage & warpage of injection molded parts
    – Part wall thickness variation
    – Cooling & solidification
  12. Material selection process
  13. Material characteristics
  14. Material applications
  15. Material limitations
  16. Activity : Material selection process

3. DFM for plastic parts

  1. Wall thickness
  2. Corner design
  3. Rib design
  4. Boss design
  5. Gusset
  6. Parting line considerations
  7. Part ejection
    – Draft angle
    – Undercut & holes
    – Esthetic considerations
  8. Mold filling considerations
    – Gating
    – Mold filling orientation
    – Mold filling pressure losses
    – Flow leaders and flow restrictors
  9. Weld lines
    – Types of weld lines
    – Material considerations
    – Improving weld performance and appearance
  10. Design for manufacturing & assembly
  11. Self tapping screw
  12. Design for mistake proofing

4. Molding & secondary processes

  1. Molding Process cycle
  2. Tampo printing
  3. iii. US welding
  4. Laser printing
  5. Heat staking
  6. Adhesive
  7. vii. Washing
  8. viii. Spray painting
  9. What design detailing required for processes above?

5. Injection mould

  1. Types of mould
  2. Two & three plate mould
  3. Sprue and runner
  4. Types of gates
  5. Gating and molding defects
  6. Venting
  7. Cam actions
  8. Ejection

6. Measurement of plastic

  1. Dimensions
    – Contact measurement system
    – Non-contact measurement systems
  2. Strength measurements
  3. Melt flow properties
  4. Flammability
  5. Fatigue
  6. Thermal properties

 

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