A Survey on the Experimental Procedures used in Investigations about

Chatter Phenomenon using Boring Bars

Ahmed A.Barakat 23/05/2013

1. Shaban A., "Effect of Some Design Factors on The Dynamic Performance of Boring

Bars"-1984

a. Static Stiffness

Load : Calibrated loading device

Response: Dial indicator

b. Impulse test of boring bars

Load: In same direction of the resultant cutting force. The Exciting force was

measured using a piezoelectric force transducer screwed on the hammer.

Response: Piezoelectric accelerometer fixed on the dummy tool in direction of

variation of the undeformed chip thickness.

Data Processing: 2-channel oscilloscope,HP-87 computer.

Reference: Sampling procedure (1)

c. Uniform flank wear land

Objective: attain a flank wear land of about 0.1 mm, to reach the range of uniform

gradual wear

Cutting Conditions: 40 m/min cutting speed, 0.08 mm/rev feed

Cutting time: 1 minute.

d. Limiting Width of Cut

Objective: Determine the limiting width of cut

Response: Piezoelectric accelerometer fixed on the dummy tool in direction of

variation of the undeformed chip thickness.

Detection of the onset of chatter : Chatter Detector (2)

Tool Overhang: 11mm

Tool replacement: 5 tests at low speeds(40 m/min), 2 tests at higher speeds

Tool holder : clamped with a torque of 80 N.m

Cutting Conditions: Width of cut 0.1 to 1.8 mm, Cutting speed 35 m/min, Feed 0.16

mm/rev.

Bar back tension: 3500N

2. Abu-Aesh M.A, "An Investigation into the self excited vibrations of boring bars on a

centre lathe"-1982

a. Determination of dynamic characteristics of boring bars

Free Vibration Test: using logarithmic decrement

Harmonic Excitation: Sine sweep excitation frequency, using electrodynamic

vibration exciter driven by fn generator. Response is measured using piezoelectric

accelerometer.

b. Boring bars : 20 mm to 38 mm, overhang : 90 to 267 mm

c. Excitation frequencies: 1.5 N from 60 hz to 900 hz

d. Cutting conditions: Cutting speeds (10,80,100 m/min) , feeds (0.08 to 0.035

mm/rev), width of cut (0.1 to 1.15 mm)

e. overhang of inserted cutting tool : 5 to 30 mm

f. plan approach angle : 45 ,60,70,90 degrees

3. Kuchma L.K, " Boring Bars with Improved Resistance to Vibration"-1956

a. Cutting Conditions: v=40m/min, s=0.3mm/rev, a=3mm

4. Andren, Hakansson, "Active Vibration Control of Boring Bar Vibrations"-2004

a. Cutting Conditions : v(80-150 m/min) , a(0.5-1.5 mm), s(0.2-0.3 mm/rev)

5. Andren, Hakansson, "Identification of dynamic properties of boring bar vibrations in a

continuous boring operation" -2002

a. v(50-300 m/min), s (0.1-0.3 mm/rev), a(2 mm)