The International Independent Centre of Excellence for Spring Technology

Spring Material Selection & Basic Spring Design PDF Print E-mail
2010 COURSE DATES: 21st, 22nd & 23rd September
ATTEND EITHER OR BOTH COURSES
DAY ONE & TWO - MATERIAL SELECTION
Providing considerable information about the properties of spring materials and the logic behind the criteria for their selection to ensure suitability for an intended purpose.
Covering all the common spring materials together with some of the more specialised “exotic” grades, providing information on chemical composition, static and dynamic performance, heat treatment requirements and other properties appropriate to spring applications.
Suited both to newcomers into the spring industry and those seeking a ‘refresher’ that will help them to make optimum selection of spring materials. The course is also valuable to material suppliers enabling them to advise their customers about correct material selection for specific applications.  Some important aspects of basic metallurgy will be covered in the course, since this will assist with a more complete understanding of the principles of spring materials selection.
Drawing heavily upon our in-house data bank of information on spring materials and their properties, as well as our knowledge of the development of spring materials around the world.
DAY THREE - BASIC SPRING DESIGN
Providing a programme that looks at the basic elements of material selection and spring design. This course will incorporate a large amount of practical exercises where delegates will be able to design a spring with the assistance of the course tutor and experience first hand the pit falls of spring design. Other practical exercises will involve using our range of spring testing machines to determine the load and rate values of a number of springs.
Learning how to establish which material is best for which spring type and why, and how each spring parameter (wire size, active coils, spring diameter etc), influences a springs load at length.
Ideally suited for the machine setters and operators by providing them with a basic understanding of spring design.
More advanced Spring Designing Training Courses are offered by the Institute. Delegates do the Basic Spring Design in isolation or then go on to complete the more advanced courses.
COSTS (Excluding VAT):
  • ONE DAY £225.00 Member / £300.00 Non Member - Basic Spring Design Only
  • TWO DAYS £400.00 Member / £525.00 Non Member - Material Selection Only
  • ALL THREE DAYS £550.00 Member / £700.00 Non Member - Material Selection & Basic Spring Design
DAY ONE & TWO - MATERIAL SELECTION
DAY ONE DAY TWO

10:15 Coffee & Registration

10:30 General Properties of Spring Materials

  • Hooke's Law
  • Strength and elastic limit
  • Tensile test demonstration
  • Resistance to: relaxation, fatigue, corrosion

12:00 Introduction to IST's spring material database

  • Wire, strip and bar spring materials

12:30 Lunch

13:30 Basic Ferrous Metallurgy

  • FE-C and TTT diagrams
  • Cold work
  • Heat treatment

14:30 Optical metallurgy demonstration

  • Showing the appearance of pearlite, bainite, tempered martensite and drawn austenitic microstructures, and some of the faults that may occur

15:30 Material selection for static applications

  • Safe design stresses
  • Moduli, E and G
  • Prestressing
  • Formability
  • Formability and bend radii

16:30 Coilability

  • Fracmat for wire

 

 

09:00 Springmaking processes and Residual Stress

  • Coiling/bending
  • Stress relief
  • Grinding
  • Shot peening
  • Prestressing

09.30 Material Selection for long term or high temperature applications

  • Relaxation

10:00 Material Selection for dynamic applications

  • Fatigue

11:00 Material selection for springs in corrosive conditions

  • Theory
  • Practice - salt spray, humidity testing
  • Corrosion protection vs selection of corrosion resistance materials

12:00 Special properties

  • Electrical, constant modulus, density

12:30 Lunch

13:30 Spring materials and their specifications

  • Carbon steels
  • Low alloy steels
  • Stainless steels
  • Copper alloys
  • Nickel alloys
  • Titanium alloys
  • Newly developed materials

14:30 Information needed to select the optimum spring material

15:00 Practical exercises in material selection

  • Use of specifications
  • Use of IST's database

16:15 Course recap
DAY THREE - BASIC SPRING DESIGN
DAY THREE DAY THREE Continued...

09:15 Coffee & Registration

09:30 Introduction to the course

09:35 Static properties of spring materials

  • Tensile strength and hardness
  • Elastic modulii
  • Allowable static stresses
  • Prestressing

Relaxation performance of spring materials

  • Elevated temperature operation
  • Stress vs time vs temperature
  • Maximum allowable temperature
  • Hot prestressing / hot setting

Fatigue properties of spring materials

  • Fatigue mechanism
  • Factors influencing fatigue
  • Shot peening
  • Design data for fatigue

Corrosion properties

  • Intrinsic properties
  • Coatings

Spring materials specifications

  • Available range of materials
  • Common specifications

 

11:00 Compression spring design

  • Standards
  • Spring end type
  • Number of coils relationship
  • Solid length
  • Design formulae for spring rate
  • Theoretical vs actual load/deflection line
  • Residual range

12:30 Lunch

13:30 Compression spring design cont.

  • Design formula for stress
  • Curvature correction factor
  • Allowable design stresses and prestressing

13:00 Extension spring design

  • Initial tension
  • Load/deflection characteristics
  • Hook types
  • Standards
  • Design formulae for rate and stress
  • Effect of LTHT

15:30 Torsion spring design

  • Leg forms
  • Method of operation
  • Dimensional changes
  • Specification of angular relationship of legs
  • Design formulae for rate and stress
  • Allowable stresses

16:45 Conclusion