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In the SMT patch production process, as long as the physical activity of the material is changed, the value can be added in the production process. For example, welding, assembly, etc. add value, inventory, handling, inspection, etc. do not add value. Activities that do not add value but add cost are wasteful. Production companies generally think that profit = price-cost, the current SMT production price is basically fixed, and the cost can be manipulated, enterprises must improve profits as long as the cost is reduced, and the main cost reduction is to eliminate waste in production.
The waste that exists in SMT production is generally：
1.The waste of SMT equipment includes the operation rate of the placement machine, and the utilization rate is low. If there is no 24-hour non-stop operation, there are equipments that are accelerated due to poor maintenance, equipment is idle, equipment failures form downtime and repair costs are all equipment waste.
2. material waste, including the throwing machine's throwing, chip, small components lost, damaged, PCB board damage, invalid, solder paste, the use of solder paste components are not accurately calculated, resulting in wasted waste, poor storage Form deterioration, invalidation, etc.
3. waste of repair and maintenance, refers to the time, manpower, material waste, and related losses caused by the disposal of defective products in production. Such waste specifically includes: loss of materials, defective products become waste; loss of equipment, personnel and working hours; loss of additional corrections, discrimination, and additional inspections.
4. human waste, refers to activities that do not add value in production, too many processes, the production line has unreasonable, unbalanced, uneconomic, not a stream of work, there are bottleneck processes exist to form product backlog, personnel idle, personnel arrangements are not In place, the loss of key personnel.
5. the waste of working methods, unbalanced work and improper production planning, waiting for reasons such as waiting, no operating procedures, no standard work, process confusion, work has not reached optimization.
6.Other aspects, such as production management personnel, production support staff costs, office fees, air conditioning, water and electricity lighting fees.
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