automotive light weighting - tntdpctntdpc.com/automotive-2017/sundararajan t.pdf · a challenge to...
TRANSCRIPT
AUTOMOTIVE LIGHT WEIGHTINGa journey and not a destination
Dr. T. SundararajanHead , R&DWheels India Limited CII, Chennai. 9th March 2017
% Automotive Materials
Mild SteelHSLA Steel
Other Steel
CopperRubber
Aluminium
Powder MetalGlass
Plastics / CompositesStainless Steel
Lead
43.7%
1.4%
8.2%
1.5%
Cast Iron 13%
7.8%
5.6%
4.3%
2.8%
1.4%
0.8%
0.8%
Die Cast Zinc 0.5%
Fluids / Lubes 6%
Others 2.2%
CARBON FIBRE IN AUTOMOBILES
An European OEM has considered extensive usage of Carbon fibre in their vehicles for weight reduction to asignificant level. The photograph below shows the Roll Cage of the vehicle being lifted only by two personnel as aresult of extended light weighting
0 20 40 60 80 100
Carbon Fibre
Aluminium
Plastics
HSS
Steel
MATERIAL WEIGHT (% OF STEEL)
0 100 200 300 400 500 600
Carbon Fibre
Aluminium
Plastics
HSS
Steel
MATERIAL COST (% OF STEEL)
ALUMINIUM IN AUTOMOBILES
Engine Block Transmission Housing Bonnet
Radiator Passenger Car Wheel Truck Wheel
MAGNESIUM IN AUTOMOBILES
The Ford F 150 stands to speak out the extensiveusage of magnesium in its parts for light weightingoptions without incurring the cost sway of HSS andfibre reinforced plastics
STEEL
ALUMINIUM
MAGNESIUM
50 % Lighter than Steel
30 % Lighter than Aluminium
Magnesium manifold in vehicle made by die casting technique
Advantageous over Aluminium in a way that it can bepressure die casted with ease resulting from itspeculiar property
Solidifies faster giving it excellent casting properties
MAGNESIUM BRACKETS
MAGNESIUM MANIFOLDS MAGNESIUM CLUTCH HOUSING
Crashworthiness
• Steels and Stainless Steels being highly strain rate sensitive.
• Faster the loading is applied the more the material will resist deformation.
• Steels and Stainless Steel has the capability to collapse progressively in a controlled and predetermined manner.
CRASHWORTHINESS AND SUBSEQUENT SAFETY REQUIREMENTS HAS ALWAYS BEEN
A CHALLENGE TO AUTOMOTIVE LIGHT WEIGHTING
Futuristic Automotive Materials
Power Train
Chassis
Exteriors
Interiors
Power Train
Chassis
Exteriors
Interiors
Iron, Steel, Aluminium
Steel, HSS
Steel, Aluminium, Plastic
Steel, Plastic, Composite
Aluminium, HSS, AHSS
HSS, AHSS, Composite
Steel, Aluminium, HSS, AHSS, Plastic
Steel, Plastic
CURRENT MAJOR OCCUPANTS FUTURISTIC OPTIONS
WHEEL : STEEL Vs ALUMINUM
No weight Saving in the passenger car segment for wheels.
Only Aesthetical.
12 Kg
11.6 Kg
6.8 Kg
7.03Kg
6.5 J x 16 5.5J x 15
Strength RatioCASTING DEFECTS
Pores and Dendrites
REASON FOR THE DEAD LOCK
High Strength Steel
Fatigue strength is 25% of UTS; Steel 50%50 X
ALUMINIUM IN AUTOMOBILES
INCREASE IN FUEL EFFICIENY = 2 – 3 %
TIRE LIFE INCREASE – 25 % COOLER RUNNING
Light weight by 55%LESS MAINTANCE COST
LIFE OF MATING PARTS INCREASES –BRAKE LINING AND
WHEEL BEARING
UNIFORM TIRE WEAR
WIL FORGED ALUMINUM WHEELS FOR AUTOMOTIVE APPLICATION
Development of Tubed Al wheel
Aluminum wheels are by default tubeless
Indian market is ruled by tubed wheels
Tubed wheels in commercial segment are 2piece/3piece construction
Required extra piece with springiness
Steel is the choice and can worn out the mating surface
Big safety issue if the flanges comes out
Tubeless wheel
Tubed wheel
Crash Worthiness
CAN STEEL BE RULED ALL THE TIME
?
ADI
CAST STEEL BEING REPLACED WITH AUSTEMPERED DUCTILE IRON IN TRUCK SUSPENSION
SUPPORT
ADI with hardness magnitude ofup to 550 BHN were producedand employed where high wearresistance in of importance inautomotive engineering.
Softer ADI (275 – 325 BHN) cantransform in to martensitewhen subjected to physicalstrain, hence in applicationsuch as transmission gearsworn out regions can befreshly replaced by strainhardened ADI therebyincreasing product life
Emerging Material: TWIP Steel
Twinning Induced Plasticity (TWIP) Steel
C850 SS
High Strength Steel
HIGH ENERGY ABSORBING AND STRENGTH STEEL WITH EXCELLENT FORMABILITY
Appliication 2
High Strength Steel Wheel
High Strength and High energy absorbing Steels
High Strength Steel Wheel
THE WIL MADE HIGH STRENGTH STEEL
6.0J x 16
900 MPa Strength
Excellent in Crashworthiness
Light Weight Conference
Frugal Methods
OTHER FRUGAL METHODS AND STATE OF THE ART MANUFACTURING TECHNIQUES FOR
AUTOMOTIVE LIGHT WEIGHTING
HIGHLIGHTS ON AUTOMOTIVE WHEEL MAKING
1. Reducing the Parts with Better Efficiency
2. Light Weighting in Raw Material
3. Facilitating Efficiency of Other Parts
REDUCING THE PARTS
ALTERNATIVE FOR DUAL MOUNTING WITH ONE
BETTER PACKAGING SPACE AND CLEARANCE FOR OTHER AXLE PARTS
UPTO 71 % WEIGHT SAVING IN ALUMINUM WHEEL USAGE
UPTO 50 % WEIGHT SAVING IN STEEL WHEEL USAGE
UPTO 33 % COST SAVING IN STEEL WHEEL USAGE
UPTO 12 % COST SAVING IN ALUMINUM WHEEL USAGE
NO ISSUE OF TIRE BURST OR LOSS OF CONTROL PROBLEM
NO CHANCE IN DUAL TRACK WIDTH OR OTHER PACKAGING
DESIGN APPROVED FROM ROAD TRANSPORT AUTHORITY OF STATE
INTRODUCING : SUPER SINGLE WHEELS FOR TRAILER APPLICATION
Introduction to Wheels
Lock Ring Rim BaseDisc
Flange
Disc Lock Ring Flange Rim Base
INTRODUCTION TO WHEELS
Flow formed / Hoop discTHE FLOW FORMED DISC STEEL WHEELS
Conventional Disc Making Process
Flow Formed Hoop Disc
(a) Conventional Press Formed Disc – Having uniformthickness throughout
(b) The Flow formed / Hoop Disc – An innovative methodwhich allows variable thickness across the cross section ofthe disc thereby allowing significant weight saving
The Disc Gutter WheelThe Disc Gutter Wheel for LCV’s and ICV’s
Regular LCV / ICV wheel Disc Gutter LCV / ICV wheel