The lean aims to reduce any types of waste (muda). It categorize
the waste in the following 7 types: the waste from over manufacturing, waste
from long lead time, waste from moving parts, waste from manufacturing itself,
waste from inventory, waste from unnecessary actions and waste from mal-quality.
The lean provides a set of tools to eliminate those waste in
the manufacturing process. We are going to look at 3 types of control methods.
Kanban Control, CONWIP control and Hybrid control.
The Kanban control
The blue shows the movements of parts, the red shows the
circulation of Kanban, circle represents machines and triangle represents
buffer. In this way, once the part is manufactured and moved to the buffer, the
Kanban card will go upstream to give signal for another manufacturing. This
reduces the waste from over manufacturing.
CONWIP control
CONWIP means Constant Wok-In-Process. This type of control
strategy controls the total incoming parts to the manufacturing system. As we
can see from the below chart, only the finished goods have been “pulled” by
customer demand, new parts will be allowed to enter the manufacturing process.
Hybrid control
The combination of Kanban control and CONWIP control, this
is particularly useful when the system is heavily utilized. The CONWIP will
help to control the overall input and Kanban controls the internal buffer
level.
The three types of lean manufacturing control have similar
but different ideas, how should you choose your control methods? What are the
bases of choosing the control method?
Resource:
http://www.fastcompany.com/51967/living-dell-time
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