OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
VTM01 is 1526 sec. Due to variation in cycle time of both the machines; the component from the VTM 01 machine
gets bottled up in the buffer station due to shorter operation time of the VTL machine From the existing line
balancing chart it is clear that there is higher cycle time (918 sec) at second operation VTM 02 compared to customer
takt time of 699 sec. To balance the line for customer takt time at VTM 02 machine two operations namely ID
roughing and ID finishing are shifted to Horizontal Machining Centre A81 machine. The cycle time of each operation
is given in the Table 1.
From this change the cycle time at VTM 02 is brought down from 918 seconds to 676 seconds, which gets balanced
with customer takt time of 699 seconds which is shown in fig 2.
After shifting two operations from VTM 02 to HMC A81 the cycle time at HMC A81 gets increased to 863 seconds
which is more than the takt time of 699 seconds.
1000
918
Cycle Time (seconds)
800
600
400
200
719
621
475
Takt Time= 699
0
1st 2nd 3rd 4th
Operation
Figure 1 Line Balancing Chart of OIB Axle Housing for Existing State
Takt Time= 699
Cycle Time (seconds)
Operation
Figure 2 Modified Line Balancing Chart for OIB Axle Housing
To balance the cycle time of HMC A81 machine with takt time four operations namely Dia 80 rough milling, Dia 63
fine milling, Dia 8 drilling and 3/8 turning operations are shifted to HMC A51 machine.
After shifting these four operations to the HMC A51 machine the cycle time of machine HMC A81 comes down to
677 seconds which get balanced with customer takt time of 699 seconds. With these improvements waiting time for
the material at HMC A51 machine gets reduced. Process inspection is performed at the end of machining work and
time taken for process inspection is 60 seconds.
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