design and fabrication of cylindrical rollers (2)
TRANSCRIPT
DESIGN AND FABRICATION OF CYLINDRICAL ROLLERS FOR
SHEET STRAIGHTENING MACHINE
AUTONOMOUS COLLEGE UNDER VISVESVARAYA TECHNOLOGICAL UNIVERSITYBELGAUM
A Preliminary Project Report on DESIGN AND FABRICATION OF ROLLERS Submitted in partial
fulfillment of the requirements for the award of Degree ofBACHELOR OF ENGINEERING in MECHANICAL ENGINEERING
ByGOKULRAGHUNANDAN 1BM07ME036
RAKESH.R 1BMO7ME092 VIVEK.S.U 1BM07ME124
Under the guidance of
MAHENDRAN. RAssociate Professor
Department Of Mechanical EngineeringB.M.S College Of Engineering
Bengaluru – 560 019
BMS COLLEGE OF ENGINEERINGBENGALURU – 560 019
DEPARTMENT OF MECHANICAL ENGINEERING(Accredited by NBA 2008-20110
DECEMBER 2011
CARRIED OUT ATBharat Earth Movers Ltd (BEML)
CONTENTS INTRODUCTION APPLICATIONS REQUREMENT DESIGN DETAILS OF MACINE SPECIFICATIONS OF MACHINE CAD MODELS FABRICATION CONCLUSION AND FUTURE WORK.
INTRODUCTION Cylindrical rollers are used in bearings
where the majority load is in the radial direction. Although mostly cylindrical in shape, some specialist bearings have convex barrel shapes or concave profiles depending on the application type and conditions.
Pure cylindrical roller bearings cannot support any load in an axial direction. If axial support is required a separate bearing arrangement will be required.
APPLICATIONS Cylindrical rollers are used in various
applications. They can carry huge loads. They have high radial load capacity and
are suited for high speed applications. It offers low noise, low heat generation ,
and for more adorous applications.
REQUIREMENT The cylindrical rollers had to be designed
for use in a sheet straightening machine. The existing rollers on the machine were
faulty hindering the smooth motion of the workpiece.
The straightened workpieces were deforming while exiting the machine due to the faulty rollers.
The height adjustment mechanism was faulty and time consuming to use.
DESIGN Steel was selected as the material for
fabricating the rollers for high strength and durability.
Shielded single row deep groove ball bearings were selected for ease of lubrication.
Bearings of bore dia 20mm and outer dia 52mm were used as the were capable of handling the specified load.
Details of the machineName : Sheet straightening
machine. Manufacturer : Holl Mohn(GERMANY)
Type : UPN-160
Equipment no. : RA3-0002
Work centre code: 513
Specifications of the machine
Horizontal (hydraulic straightening machine)
Capacity : 160 tonsStroke of ram : 300 mmArea of ram(H*W) : 350*400 mm
Throat : Min. distance between table and ram:
330mmMax. distance between table and ram:
680mm
CAD MODELSROLLER
Dimensions of roller
Bearing specificationsBearing Type Shielded Single Row Deep Groove BALL BEARINGBore Dia (d) 20.0000 mmOuter Dia (D) 52.0000mmWidth (B) 15.0000 mmDynamic Load Rating 15900 NStatic Load Rating 7850 NMax Speed (Grease) 14000 r.p.mBall Qty. 7Ball dia 9.520mmWeight 144 gm
Bearing
Bearing diameter
Bearing width
Bearing housing
Bearing Housing Step Widths
Bearing Housing Width
Bearing Housing Diameters
Bearing Housing Covering Plate
Plate Width
Plate Diameter
FABRICATION For the roller we first cut steel rods of
diameter 50mm into rods of length 200 mm each.
Turning operation was performed on these rods for a length of 20mm on either side to give 20mm resultant diameter to achieve a push fit for the bearings.
The edges were chamfered.
ROLLER
The bearing housing circular discs were cut out from a metal plate of thickness 22mm using a CNC oxy-fuel cutter.
The resultant part was machined in the lathe to get the required dimensions to house the bearing.
Chamfering was done where required.
BEARING HOUSING
•For the housing covering we used sheet metal of thickness 5mm.•A disc of diameter 70mm was cut from this using a CNC oxy-flame cutter.
BEARING HOUSING COVER
CONCLUSION AND FUTURE WORK
The design and fabrication of height adjustment arm.
Design and fabrication of height adjustment mechanism at the base.
Provision for lubrication (oil holes, greasing).
Assembly
Bibliography www.bearings.machinedesign.com catalog.astbearings.com