pasted on the improvement of the efficiency of pcb assembly process
Name: pasted on the improvement of the efficiency
From the definition of IPC we can see that influence the efficiency of the pasted on the main factors are the denominator, SMT time, send plate time, as well as molecular; Each PCB (veneer or makeup), the common denominator is smaller, the greater the molecules, the pasted on the higher efficiency. Figure 1 shows the definition of IPC9850.
Figure 1 total pasted on the working time
From figure 2 can see, send plate time consists of two parts, the first part contains a single PCB into to the pasted on time and in mounted area holding fixed time used; The first working section contains a loosen the PCB when asked and will send pasted on the PCB OuDeShi asked. Pasted on the time means that from time to time to board the end to the last element mounted between the end of the time, including the PCB datum point identification, suction nozzle replacement and all components mounted time used.
Figure 2 safety lock light a detailed map
Mounted on the efficiency of the test, the actual production, according to the original equipment manufacturer and equipment company, the application of actual measurement methods are different, the following are introduced.
1. To original equipment manufacturer
In the equipment production test is usually IPC9850 defined as reference, based on the single equipment quality and production efficiency test for each table mounted equipment mounted efficiency factory value. With the universal instruments (UIC) in Advantis series multifunctional machine used in the production of the Chip material mounted efficiency (speed) testing method as an example, brief introduction is as follows:
(1) set up the test conditions
AC - 72, single-beam, single FJ07 head (7 shaft, with camera OTHL), single send plate institutions (each time only one PCB in SMT position) seven Feeder (Feeder) with 0603 coil resistance element, the standard test using special PCB PCB (IPC9850 requirements according to the size, IPC9850 recommend glass plate glass, but fragile, and the cost is higher, therefore adopt special PCB), the group suction material (Gang Pick, a draw seven makings) mode, use only FJ07 head OTHL camera, in the whole speed tests don't change the suction nozzle.
Figure 3 is AC - 72, equipped with FJ07 head.
Figure 3 AC - 72 with FJ07 head
(2) the calculation standard
In the continuous four PCB dam 刂 try, don't allow any cast material/draw a fault in the back of the meter, only three plate actual mounted time to calculate the average pasted on the Chip material efficiency (speed), as the factory to provide reference value.
It should be pointed out that, it is used to compare different set the performance is very useful, represents a particular type of highest capacity, for example, universal AC - 72 multi-function machine, this equipment nominal output for not less than 500 and CPH, about 0.19 sc/chip, this is according to the above in particular ideal conditions that the best chip material data, and the actual production environment is likely to be worse than the efficiency of the data summary is low, such as, the feeder doesn't work properly, coil zone and element out-of-tolerance, suction material is not normal, and set the improper maintenance factors, so in selecting multi-function unit should take it as the important parameters, and at the same time, also should consider it in the big components and special element mounted ability.
2. The application of equipment business
Usually use time unit PCB (veneer or concatenated plate) as measured by the number of production, of course, equipment manufacturers will also use this method to evaluate, type of SMT time and send plate unit of time for seconds. The actual can use stopwatch record continuous production 4 PCB time to calculation, figure 4 is PC9850-3-2 definition.
Figure 4 IPC9850-3-2
In figure 4 send plate time and pasted on the definition of time with IPC9850-3 - l the definition. In addition, SMT equipment are usually equipped with special database to record the actual production in each of the PCB exact SMT time, to facilitate the use of equipment business for the production efficiency of the statistical work in practical production, also can use it for reference.