AVC COLLEGE OF ENGINEERINGMechanical Engineering

DESIGN OF DRILL PCD ADJUSTABLE MECHANISM AND RESPECT MODIFICATION OF MULTI

DRILLING MACHINE.

Guided By

Mr.P.Amith kishore , Asst. Prof/Mech.

Industrial GuideMr.A.Balakrishnan(DGM)

AXELS INDIA LTD, Sriperumbudur.

Submitted by

E.Krishna samy(80107144020)R.Sudhakar(80107144047)

V.Vasanthabharathi(80107144052)K.Veerapandian(80107144055)

PROBLEM DESCRIPTION

• In order to drill multi hole of the 60SH and 90SH diff case components in industries used a rigid fixture without any PCD (Pitch Circle Diameter) adjustments in nature.

• For That reason ,we have to work more for replacement of the rigid tool guide setup. But it practically gives more hard and work time delay.

• The conventional machine used for various type same ratio PCD drill components , but there is a need of adjustable tool guide is essential.

OBJECTIVES

• To simplify the tool position adjustments.

• To reduce the time of drill PCD adjustments by the movable tool holding set.

• To avoid replacing of the rigid tool guider. Here we use adjustable clamping of tool holder.

DRILLING COMPONENTS

• 60SHand 90SH they are components used in the differential case in bus and heavy trucks respectively.

• They have twelve holes in the same angle ratio and slightly differed in the diameter of drill.

• All aspects of the drilling of that components are same. Simply says , they are same ratio in all.

COMPONENT VIEW

MULTI DRILLING MACHINE

• Multi drilling machine is a heavy duty machine type it has high drill force and motor power. in this case drill will be twelve holes at the same time.

• This machine specification: Speed of drill machine: 1700rpm Torque of the motor: 48 Nm Power of the motor: 11 Kw Feed rate of the machine : 400mm/min Drill bit diameter: 15mm

MACHINE VIEW

METHODALOGY

MACHINE MODIFICATIONS

• Height variation provider.

• Plate dimensions changing with permissible limits.

• Minimum and maximum diameter of the drill PCD determination.

• Tool holder travel distance in the slot of the adjustable plate.

ADJUSTABLE PLATE• Adjustable plate consist of C shaped clamp with U bolts.

• Slots are formed in the plate for required size of the drill diameter.

• Then C shaped clamp with specified diameter, along with U bolts.

• This clamp diameter based on the diameter of the PCD of the component.

• U Bolt dimensions based on the clamp and tool holder diameter and it will be same for any type of C shaped clamp used here.

TOP VIEW OF THE PLATE

ADJUSTABLE PLATE DIMENSIONS

• Total length of the plate taken 700mm

• Travelling distance of the slider in slot simply it as triangle: 111.35 mm

• Distance travel of the slider with use of universal coupling: ((2*5.17)+111.35)=121.69mm

• Slot length up to out end: 2*distance travel)+2(slot circle diameter)+minimum diameter of the pcd: ((2*121.69)+(2*25)+164)=457.38mm

Contd…

• Position 1(Minimum)

Height =(2*universal joint 1st yoke height )+(2*Universal joint 2 nd yoke height)+Propeller shaft length)

=(2*20)+(2*15.32)+222.69

= 292.79mm

Horizontal travel initially =0mm

Contd….

• Position 2(maximum)

Height =(2*universal joint 1st yoke height )+(2*Universal joint 2 nd yoke height)+Propeller shaft length)

=(2*20)+(2*19.32)+280.12

=358.76mm

Horizontal travel length=(2*yoke length )+(travel of shaft without universal joint)

= ((2*5.17)+111.35)

= 121.69mm

Contd…

C shaped clamp dimensions:

For minimum diameter of drill pcd

Inner diameter =164+(2*12.5)=189mm

Outer diameter =10+inner diameter

U Bolt Dimensions:

U bolt wire diameter taken as 10mm

U bend diameter=10+slider diameter

=10+25

=35mm

Recommendation 1(Hydraulic height variation adjustment)

All dimensions are in mm

POSITION ANGLE(DEGREE)

HARIZONTAL TRAVEL

HEIGHT VARIATION

STATUS DRILL PCD DIAMETER

1

2

140

165

0

121.69

0 (292.79)

66.15(358.94)

Minimum

Maximum

164

386.7

Recommendation 2(Spline shaft adjustment )

All dimensions are in mm

Position Drill PCD Angle Travelling distance

Height variation Spline hub Inserting(%)

variation Spline in hub

1

2

164

386.7

140

165

0

121.69

0

66.15

100%Inserted

33.85%Inserted

100/100=1*100

66.15/100=0.3385*100

COMPONENTS USED

• Propeller shafts• Universal joints• Spline joint• Press fit bush• U bolts• C shaped clamp• Linear bearing• Stud bolts

Propeller shaft and universal joint

UNIVERSAL JOINT ANIMATION

MODEL AND MACHINE VIEW

3D VIEW OF TOOL GUIDE

3D VIEW

ADVANTAGES

• Easy to handle the adjustment clamps and U bolts while clamping.

• No need of fork lifts.

• No need to replace the tool guide components.

• Adjustment and clamping time will be very much less compare than formally used.

DISADVANTAGES

• Hydraulic system for height variation is excessive one.

• This components should be newly manufactured.

CONCLUSION• This project will give good effort and easy

use of machine.

• Easy implementation of the guide plate.

• This is feasible and possible to implement in that particular HMT multi drilling machine.

Thank you