Jul 04 2009
With OEE wastefulness on the Trail
The Overall Equipment Efficiency index in practical use
One way to uncover waste and hidden reserve capacity to develop is the use of the indicator Overall Equipment Efficiency - OEE.
It is one of the main tasks of controlling production, the efficient use of resources in terms of material, personnel and capital to be continuously optimized. This means that all the potential to reduce unit costs, improve productivity and increase the capacity utilization of facilities in order to identify any kind of wastage should be avoided.
The indicator Overall Equipment Efficiency - OEE
The Overall Equipment Efficiency is a key indicator for calculating and analyzing the productivity of a manufacturing plant. The Overall Equipment Efficiency measures the ability of a system whose full theoretical potential to produce in the allotted time to produce products.
This is not solely a question of the actual utilization of a machine or plant in relation to its theoretically possible to set, but rather the identification of other factors, on the efficient deployment of a production machine work.
For optimal interpretation of the available capacity, it is primarily in the process industry, the OEE’s the individual process steps to an overall OEE the full production system should be aggregated.
Calculation of Overall Equipment Efficiency
The Overall Equipment Efficiency is derived from the product of equipment availability, performance rate and the quality of the produced quantity.
OEE = availability x performance x quality grade loss
with
Plant availability = (net operating time / planned time) x 100 (%)
Power level = ((actual output x cycle time) / net operating time) x 100 (%)
Quality Rate = (actual yield / potential yield without error) x 100 (%)
Thus, with a downtime of 30 percent in conjunction with a 80-percent plant utilization and a yield in the amount of 90 percent Overall Equipment Efficiency equal to 50 percent.
In not a few manufacturing plants, the OEE in less than 60 percent. This results, for example, the fact that when bottleneck machines quickly goes through additional investment to build additional capacity. A premature increase in capacity but the capital is deteriorating profitability in the company, since additional capital will be committed. In most cases, avoid hasty investment when knowledge of the hidden reserve capacity in the production has.
Strengths and weaknesses of the Overall Equipment Efficiency
The OEE Management is a holistic and durable scale optimization task by all direct and indirect manufacturing areas along the entire chain into account.
The Overall Equipment Efficiency is a useful indicator for monitoring the performance of individual plants or by aggregating the entire production unit. The strength of the OEE In particular, any investment losses systematically identify and analyze this in a concerted action plan to correct them.
For the practical implementation of the OEE mangement is to consider that the Overall Equipment Efficiency as a key figure is still relatively unknown and the manual Störgründen down from a high level of care and diligence required to ensure that the database is consistent personal finance software . Use of IT-based PDA systems can provide the necessary information but usually directly from the machine in a ready made software for this process. This saves resources both for the employee at the machine, as well as for the controller.
