
Strategic Development of New JIT ◾ 191
If the number of robots to be introduced to the body assembly line is 300 units,
the graph shows that the required MTBF is 30,000 h, so it is necessary to improve
the MTBF of 3000 h per robot by one order of magnitude.
7.4.4.2.2.2 Reliability Improvement for Robots — e author investigated
the total failure rate of the elements used for the robot controller and decided
to stop the use of elements with a high failure rate. At the same time, it was
attempted to reduce the element number from 1100 to 770 by integration of the
control circuit.
Furthermore, by studying the printed circuit boards with failed e ...