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