CMF334 Design of Tooling for Thermoplastics Syllabus:
CMF334 Design of Tooling for Thermoplastics Syllabus – Anna University Regulation 2021
COURSE OBJECTIVES:
At the end of this course the student should be able to understand
• To learn the design concepts for various mould elements.
• To learn the basic design aspects related to Injection Mould and Blow Mould
• To learn the basic design aspects related to Extrusion Dies.
• To learn the basic design aspects related to rotational moulds
• To learn the basic design aspects related to thermoforming dies
UNIT I INJECTION MOULD DESIGN
Introduction to Molding process and Moulds – Classification of moulds- Factors considered for Mould Design-Shot Capacity-Plasticizing Rate-Clamping Force- Injection Time – Cooling Time – Number of Cavities –Layout of Cavities. Classification – Cold Runner – Hot Runner – Hand – Semi Automatic – Automatic -Two plate – Three Plate – Moulds for Internal & External UndercutsElements of Injection Mould – Parting surface and its types , Core, Cavity , Bolsters ,Guide pillar, Guide bush, Sprue bush, Locating Ring -Standard Mould System – Mould alignment – Mould Assembly – Mould Clamping.
UNIT II DESIGN OF FEED SYSTEMS
Sprue – types of sprue – Runner – types of runner – cross section and size of runner –runner layout – balancing of runners – Gates – Gate location and balancing – types of gates – Mould Venting.
UNIT III DESIGN OF EJECTION SYSTEMS
Requirements – Elements of Ejection system – Ejector grid, Ejector plate assembly, Ejection techniques – Ejection from fixed half – Sprue Pullers- Ejection Force Calculation – Ejection Assembly Actuation
UNIT IV DESIGN OF MOULD TEMPERATURE CONTROL SYSTEM
Introduction – Heat Transfer Fluids- Chillers- Temperature Controllers- Factors affecting the Cooling Cycle -Cooling Efficiency – Mould Cooling Variables -Cooling Calculations -Cooling of Integer type mould plates – Cooling of Insert Bolster assembly -cooling of other mould partsconnections of cooling channels and seals.
UNIT V DESIGN OF OTHER MOULDS & DIES
Blow Mould Design: Introduction- Types of blow moulds – Blow ratio – Parison design –Pinch off design – parting line – Mould cooling – Mould alignment- Advantages, Disadvantages and Applications Rotational Mould Design: Introduction– Construction- Advantages, Disadvantages and Applications. Extrusion Die Design: Principles of extrusion – construction of die – die geometry – die swell – die land design – sizing die -Advantages, Disadvantages and Applications. Thermoforming: Principles of thermoforming- Mould Design & Layout- Applications.
TOTAL : 45 PERIODS
COURSE OUTCOMES:
Upon the completion of this course the students will be able to
• Apply the basics of Plastics mould design.
• Decide moulds for different processing techniques.
• Apply design aspects related to related to Injection Mould and Blow Mould
• Apply design aspects related to Extrusion and thermoforming Dies.
• Apply design aspects related to rotational moulds
TEXT BOOKS:
1. Peter Jones, The Mould Design Guide, Smithers Rapra Technology Limited, 2008, Shawbury, Shrewsbury, Shropshire, SY4 4NR, UK
2. Injection Mould Design for Thermoplastic – By Pye, R.G.W.,2000.
REFERENCES:
1. Glanvill & Denton, Injection Mould Design Fundamentals (Vol. I& II), Sors et al., Plastics Moulds & Dies , Second Edition
2. Sanjay K Nayak, Pratap Chandra Padhi and Y.Hidayathullah, Fundamentals of plastics mould design, 2012.
3. Gastrow., Injection Moulds 130 Proven Design 2006.
4. Dym J.B Injection Mould& Molding, A practical manual, Springer, Second Edition.