RFID USAGE IN RECONFIGURATION OF MANUFACTURING PROCESSES. Research by : Farshad Tavallalinia Siavash Emami. Introduction. A production control system is used to plan and control a series of manufacturing processes to maintain the required quality level and delivery schedule.
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Research by :
A production control system is used to plan and control a series of manufacturing processes to maintain the required quality level and delivery schedule.
Most current production control systems include a centralized database for production information and production schedule information for relevant facilities, and these systems provide an optimal scheduling plan in a centralized way using this information.
An RFID-based control scheme for production control systems, one that solves these problems, has been created based on the concept of holon.
So, each component of a product as a holon has been considered , and this holonic component is controlled by the RFID tag attached to the component, efficiently works in the production control system.
Each RFID tag has the lifetime information necessary for the production written by the system, such as
R : RFID tag reader/writer
T1 , T2 , T3 : RFID Tags
1) A large piece of cloth with a single RFID tag is colored in the dyeing process .
2) It is transported to the cutting process, where it is sliced into pieces and where an RFID tag is attached to each piece of cloth.
3) Wire props, each with one RFID tag and a piece of cloth with a matching RFID tag, are processed into the final umbrella product .
4) RFID tag readers/writers are attached to the front and rear of production facilities to read RFID tags attached to the components .
5) When each process is completed, the RFID tag reader/writer in the rear side updates the current status in the tag. If the order changes, the RFID tag reader/writer in the front side modifies the status in the tag to indicate a cancellation or increase or decrease in the number of products.
Let us imagine that a truck is to be assembled. The customer usually specifies the engine, possibly the transmission, the tires, body paint and cabin accessories like the stereo.
Designers and customers would have the flexibility to change specifications midway through manufacturing with each part being RFID tagged. At any moment of time, the specifications written onto the tag could be modified and production could proceed normally. This would shorten response time because design and manufacturing periods would have overlaps. Moreover, designers and process engineers would be able to control the process changes using wireless signals to directly update the RFID tags, thus reducing paperwork and human interference and improving the efficiencies obtained through automation.
The computer-aided assembly line based on RFID will improve efficiency in many kinds:
By using RFID readers to read tag’s information, the amount and detailed information of parts can be rapidly collected and input into the computer. It can save lots of resources and time.
RFID readers are also fixed on the assembly line, the information of the parts which will be assembled on the assembly line could be read by the readers. So the mating arrangement can be checked and corrected by the computer. It can prevent the emergence of the wrong assembly.
Right now two car companies use RFID in their assembly line:
BMW has applied RFID to the assembly line
Customers can choose:
RF Transponder Trials began at Ford assembly facility in Mexico in 1987 and Results looked promisingbut initial technology failed :
Read rates at 50%
Tag occasionally “randomized” data
Tag failure: all tags were not
99 % Performance