Designing Plastic Parts for Assembly

April 28 & 29, 2011.
The Raintree Hotel
120 St. Mary's Road
Chennai, India- 600 018

Seminar Hours: 8:30 a.m. - 4:30 p.m. (registration first day at 8:00 a.m.)

ETS Corp & Indus USA present a two day in-depth assembly seminar that will provide information on material selection, design procedures, processing techniques, and the assembly methods required when designing with plastics.

Upon the completion of this course you will have learned:
º Advanced concepts for plastic system and component design
º How to define and use safety factors
º Determine the optimum assembly method
º Utilize commercially available software for plastic part design
º How to select materials
º Behavior of plastic resins

To attend, click HERE

About the Instructor - Paul A. Tres

This course will make material selection, design procedures and methodologies, processing techniques, and assembly methods easier to use. It will increase your understanding of what to expect from a plastic resin. It will provide a detailed discussion of methods and a step-by-step methodology used to make the design process as easy as possible.

Designing for assembly and manufacturing has always been an important task for designers, engineers and all other involved in product development. A new emphasis has been placed on design over the last few years as designing for manufacturing and assembly (DFMA) has become a significant manufacturing trend around the world. Yet, until now, no system of design for plastics has been developed specifically for the DFMA process. This course fills that void by showing how plastics parts and systems can be designed to incorporate the benefits of DFMA.

Ideal Learner
The content of this course is intended to provide a design process that optimizes today's plastic materials for modern manufacturing systems.

The seminar is presented in two major sections. The first reviews the physical and mechanical properties of polymers, how to select the best resin for a given application. The important area of safety factors is discussed. The second section deals with specific assembly and design techniques.

Special emphasis is given to the examination of welding and bonding methods, press-fitting assemblies, reduction of components by integrating them by means of living hinges and snap-fitting assemblies.

Plan to attend and come prepared with questions to ask or experiences to share.

Seminar Outline - click on a topic to expand

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Plastics Resins
- Thermoplastics & Thermosets
- Structures: Crystalline, Amorphous, Liquid Crystal Polymer
- New Polymer Technologies
- Reinforcements & Fillers
- Additives
- Physical Properties: Density, Specific Gravity, Elasticity & Plasticity
- Notch Sensitivity, Isotropic & Anisotropic, Water Absorption
- Mold Shrinkage
- Mechanical Properties: Stress, Strain, Stress-Strain Curve
- Thermal Expansion
- Creep, Creep Curves, Creep Modulus
- Stress Relaxation
Safety Factors
- What Is a Safety Factor?, Design Safety Factors, Design Static Safety Factor
- Design Dynamic Safety Factor, Design Time Related Safety Factor
- Material Properties Safety Factor, Processing Safety Factor
- Operating Condition Safety Factor
Plastic Part Design
- Tensile, Compressive, Shear & Torsion Stresses
- Tensile, Compressive, Shear Strains
- Proper Part Design: Boss Design, Minimum Hole Distance, Ribbing
- Rib Dimensions, Ribbed Example
- Wall Stock, Thin Wall, Minimum Injection Pressure, Cavity Pressure Vs. Clamping Force,
- Knockout Design, Draft Angles, Texturing
- Poisson's Ratio, Modulus of Elasticity: Young's, Tangent, Secant & Flexural
- Apparent (Creep) Modulus, Shear Modulus, Use of Various Moduli
Non-Linear Properties
- Material Considerations, Linear & Non-Linear Material
- Geometry Considerations, Linear & Non-Linear Geometry
- Finite Element Analysis, FEM Method Application, Using FEM Method
- Most Common FEA Codes
- Case History: Bullet Plastic Jacket
- Design Tools: iSight, BMX (Behavioral Modeling), TRIZ (Altshuller)
Ultrasonic Assembly Techniques
- Welding, Ultrasonic Equipment, Process, Types of Vibrations, Cycle
- Control Methods: Constant Time & Constant Energy, Constant Travel (Partial)
- Constant Travel (Total), Horn Materials, Far-Near Field
- Fixtures, Case History: Pall Precipitate Filter
- Joint Design: Shear Joint Design, Variations of Shear Joint Design
- Flash Traps Designs, Energy Director or Tongue & Groove Design, Step Joint Design,
- Variations of Butt Joint Design, Heat Staking Assembly Techniques
- Case History: Capsela - PlayJour International
- Ultrasonic Staking Design: Standard, Flush, Spherical, Hollow & Knurled Design
- Ultrasonic Swaging, Ultrasonic Stud Welding
- Joint Design: Round Solid Post, Round Hollow Post, Cross Post, Angled Post
Spin Welding
- Equipment, Methods: Pivot & Inertia, Spin Welding Process
- Joint Design: Thin Walls Joint Design & Medium Walls Joint Design
- Plug Design for Spin Welding, Taper/Tongue & Groove, Shear/Flat Shear,
- Reverse/Vertical, Double Vertical/Vertical Curved, Horizontal/Step with
- Flash Trap, Step/Step with Energy Director
Hot Plate Welding
- Process, Parameters & Features, Advantages & Disadvantages
- Joint Design: Butt Joint Design, Recessed Joint with Flash Trap
- Butt Joint Design with Flash Traps, Case History: Washer Fluid
- Bottle Mercedes-Benz M-Class, Hot Plate Welding: Strength Capability
Vibration Welding
- Equipment, Process, Advantages & Disadvantages
- Vibration Welding Phases, Cross-Thickness Vibration Welding
- Applied Pressure, Friction Force, Joint Design for Vibration Welding
- Classical Joint Design, Bench Flash Trap/Straight Bench, Ridged Double
- Grooved Bench, Double L Flash Traps/Dovetai
Electromagnetic Welding
- Equipment, Process, Induction Coil Types Materials, Bonding Agent
- Joint Design: Tongue Groove, Step Joint, Joint Design Formula, Double Joint
- Groove Joint, Tongue and Groove Variation
- Case History: Mitsubishi - Power Steering Fluid Reservoir,
- Step Joint Variation , 3-Piece Joint, Advantages & Disadvantages
Laser Welding
- Equipment, Process: Surface Heating, Through Transmission Staking,
- Single Movement Mode, Double Movement Mode, Scanning Localized Heating,
- Continuous Illumination, Staking, Mask Welding, Examples
Bonding
- Failure Theories, Drafting Symbols, Substrate Wettability Tests
- Contact Angle Test, Surface Energy, Cleaning the Substrate
- Abrasive Methods, Substrate Chemical Treatment
- Corona Treatment & Schematic, Portable Corona Unit
- Plasma Treatment, Flame Treatment, Treatment Selection Criteria
- Bonding Stresses, Case History: Chrysler Concept Vehicle
- Joint Design: Joggle Lap, Double Scarf Joint, Butt Scarf Lap
- Tongue and Groove, Simple Lap, 3-Plate Tongue and Groove
- Stress Cracking, Polymer Behavior, Designs for Stress Cracking
Press Fits
- Material Properties, Geometric Definitions, Safety Factors, Creep Loads,
- Press Fit Theory, Design Algorithm
- Case History: Cassette Deck, Resin Properties Shaft: Stress-Strain
- Curve @ 73F & 200F, Creep Curves @ 73F & 200F, Resin Properties Pulley:
- Stress-Strain Curve @ 73F & 200F, Creep Curves @ 73F & 200F
- Solution: Case A, B, C & D
- Case History: Chrysler 300M - High Output 3.5L 60 degree V-6 Engine
- Fusible Core Injection Molding, Process, UIM Background, Design Requirements,
- Press Fit Detail, CAMPUS Database, Material Properties:
- PA66, 35%GR - DAM & 50%RH, T = -40C, +23C, & +120C at time = 0 hrs
- Algorithm, Interference Necessary, Interference Available @ 120C
- Interference @ -40C, Stress @ -40C, +23C & +120C at time=5,000 hrs
- Case History: Indeflator
Living Hinges
- Design for PP, PE, Common Designs, Design for Engineering Plastics
- Elastic Strain Due to Bending, Geometry, Hinge Closing Angle
- Hinge Bending Radius, Plastic Strain Due to Pure Bending
- Strain Due to Bending, Plastic Strain Due to Bending & Tension
- Tension Strain, Tension Bending Strain, Neutral Axis Position
- Hinge Length, Elastic Portion of Hinge Thickness
- Case History: World Class Connector, Initial Material (PA6)
- Proper Assembly Motion, Improper Handling, Production Material (PET),
- Proper Assembly Motion, Improper Handling, Yield Criteria
- Case History: Ignition Cable Bracket, Molding Hinges, Sequential Gates
- Processing Issues, Coined Hinges, Coining Process
- Case History: Gun Holster, Oil Can Principle, Exercise: Crib - Living Hinge Design
Snap Fits
- Material Design Consideration, Assembly Positioning, Datum Lines
- Safety Factors, Cantilever Snap-Fits: One-way & Two-way
- Analysis Types for Cantilever Snap-Fits, Snap Fit Theory, Geometric Relations
- Stress Strain Curve Formulae, Instantaneous Moment of Inertia
- Angle of Deflection, Equation of Deflection
- Case History: HP Notebook
- Maximum Deflection, Self-Locking Angle, Case History: Material Properties,
- FEA Model, Magnitude of Error, Annular Snap-Fit, Shallow Groove, Deep Groove,
- Angle of Assembly, Torsional Snap-Fits, Round Solid, Round Hollow , Square Solid,
- Triangular, Case History: Formulas, Material Properties, Locators/Restrictors,
- Orienting Guides, Crash Ribs, Darts, Limiters, Spring Rate, Over-deflection,
- Bridge Design, Angled Tab Design, Tab Design, Springs
- Disassembly Symbols, Thumb Depression, Recycling Symbols Convention,
- Disassembly Assists, Hidden Features
- Case History: Medication Dispensing Bottle
- Tooling for Snap Fits, Issues with Snap Fitting
- Snap Fit Software
Plastic Part Design on the World Wide Web
Free review of attendees' projects
- Individual Consulting Services --- Seminars attendees can sign up for individual consulting sessions with the instructor. The sessions are free and allow the attendee to ask questions and discuss details that cannot be handled in a larger group. Consulting sessions are 20 minutes long and are handled on a first-come-first-served basis. You can sign up for a consulting session after you register for the seminar by calling 888-300-9595 or during the seminar by contacting the instructor.