Among them, the time start rate reflects the time utilization rate of equipment; Performance startup rate reflects the performance of equipment; The product qualification rate reflects the effective working state of the equipment. The calculation formula of time startup rate is: time startup rate = startup time/load time, where startup time = load time-downtime-equipment adjustment initialization time.
The calculation formula of performance startup rate is: performance startup rate = net startup rate × speed startup rate, where net startup rate = machining quantity × actual machining cycle/startup time, and speed startup rate = theoretical machining cycle/actual machining cycle. The calculation formula of qualified product rate is: qualified product rate = qualified product quantity/processed quantity.
Overall equipment efficiency OEE is a simple and practical production management tool, which has been widely used in European and American manufacturing industries and multinational enterprises in China. The comprehensive efficiency index of equipment has become an important standard to measure the production efficiency of enterprises, and it is also one of the important means to implement TPM.
The first application of OEE can be traced back to 1960, which is used as the key measurement value of TPM. TPM is a factory improvement method, which mobilizes employees' autonomy by mobilizing their sense of ownership, thus improving the manufacturing process level continuously and rapidly.
Precautions:
1, OEE should be suitable for one machine (it can be regarded as the production line of a machine) instead of the whole production line or the whole factory, which is meaningful.
2.OEE should be regarded as a part of a series of comprehensive key performance indicators and cannot be used in isolation, otherwise it will lead to batch increase or product quality defects.
3.OEE must conform to the lean principle, and it is necessary to ensure that the calculation of OEE will not lead to rationalization and institutionalization of waste. For example, there must be no time to change lines.