Data processing: generic control systems or specific application – Specific application – apparatus or process – Product assembly or manufacturing
Reexamination Certificate
2000-03-29
2003-04-08
Picard, Leo (Department: 2125)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Product assembly or manufacturing
C700S105000, C700S117000, C118S696000
Reexamination Certificate
active
06546301
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to assembly processes and, more particularly, to a method for reinsertion in a reduced retooling cost assembly process.
BACKGROUND ART
In order to remain successful, many industries that produce consumer goods must produce these goods in approximately the sequence in which they were ordered. If the actual or perceived time to receive a product is higher than customer expectations, then the customer will find alternative, faster producers of a similar product. Therefore, it is in the best interests of producers of consumer goods to constantly strive to produce these goods in approximately the sequence in which they were ordered.
Unfortunately, producing goods in ordered sequence usually results in increased retooling costs. Most producers of large consumer goods have a limited amount of assembly lines available for each product. Generally, there are more versions of a product than there are assembly lines to produce that product. The result is that each time a different version of a product is required, the assembly line tooling must be changed.
One example of this is the painting process in an assembly plant where the process is capable of producing a multitude of different colored vehicles on one assembly line. As different customers order these vehicles, the probability of having multiple vehicles that need to be painted the same color is low. Unfortunately, each time a new color is required, the system needs to be retooled, i.e., the current colored paint in the paint guns needs to be drained and each gun needs to be flushed with paint solvent before the new color can be used. This results in increased retooling material cost because of paint and solvent lost during the purge cycle. Hazardous material cost for disposal of paint and solvent is increased.
Additionally, because of the sensitivity of the painting process to defects caused by contaminants, the presence of some colors of paint will cause defects in subsequently used paint of different colors due to over spray carried onto the next color. Obviously, the more often a new color is required, the more paint and solvent needs to be purged from the spray guns and the more defects occur. This can result in an increase in repairs and the associated waste of solvent and paint to correct the defects. The increase of repairs results in higher costs and can have an impact on the emission of volatile organic compounds (VOC's) to the environment.
One known technique to improve the paint mix is to prioritize the vehicle colors as they were ordered. As each vehicle was ordered, it would be given a special priority in order to increase the number of vehicles built together with the same color. Unfortunately, this “national mix” resulted in negligible success because of small block sizes (i.e. less than 2). Additionally, when a vehicle needs to be repaired or inspected in the body shop it is pulled out of sequence and reinserted after the repair or inspection is complete. This act of reinsertion drastically reduces block size.
The disadvantages associated with conventional reinsertion techniques have made it apparent that a new technique for reinsertion in a reduced retooling cost system is needed. The new technique should be able to reinsert an unpainted body back into the assembly sequence while maximizing existing block size and reduce VOC's released into the atmosphere.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved and reliable means for reinsertion in a reduced retooling cost system, particularly in the painting process for consumer products. Another object of the invention is to reinsert an unpainted body back into the assembly sequence while maximizing existing paint block size and reduce volatile organic compounds (VOC) released into the atmosphere.
In accordance with the objects of this invention, a method for reinsertion in a reduced retooling cost system is provided. In one aspect of the invention, a method for reinsertion in a reduced retooling cost system begins by analyzing vehicle orders in a product order sequence to determine the number of different colored vehicles present. The vehicle orders are sorted by color to generate an optimized product order sequence having all like-colored vehicles grouped together. If a vehicle body is damaged or needs to be inspected it is removed from the optimized product order sequence and repaired or inspected. Upon completion of the repair or inspection, the vehicle body is reinserted back into the optimized product sequence. Each group of vehicles is then painted in the order determined by the optimized product sequence. Only between each different color group does a paint purging process occur. After the vehicles are painted, they are resorted back into the original product order sequence so that they may be produced in approximately the sequence in which they were ordered.
The present invention achieves an improved and reliable means for reinsertion in a reduced retooling cost system. Also, the present invention is advantageous in that it reduces the number of defects caused by changing paint colors. In addition, reduces the VOC's released into the atmosphere and lowers hazardous material disposal costs.
REFERENCES:
patent: 4770122 (1988-09-01), Ichihashi et al.
patent: 4931944 (1990-06-01), Richter et al.
patent: 5347463 (1994-09-01), Nakamura et al.
Hollenbeck Ronald W.
Walkowiak Robert G.
Ford Motor Company
Garland Steven R.
Picard Leo
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