In the SMT production line, the bosses of SMT patch processing factories are often concerned about how to control production costs and improve production efficiency.
This involves the problem of the throwing rate of the placement machine. The high throwing rate of SMT placement machine seriously affects the production efficiency
of SMT. If it is within the range of normal values, it is a normal problem. If the specific gravity of the throwing rate is relatively high, then there is a problem. Then the production
line engineer or operator should immediately stop the line to check the cause of the throwing, so as not to Waste of electronic materials and affect production capacity, today
the editor of Xinling Industry will discuss with you
1. Problems with the electronic material itself
If the electronic material itself is ignored in the PMC inspection, and the electronic material flows to the production line for use, it may lead to increased throwing, because some
electronic materials may be squeezed and deformed during transportation or handling, or they may be deformed when they leave the factory. There are problems with electronic
materials due to production reasons, so this needs to be solved in coordination with the electronic material supplier, and new materials will be issued and passed the inspection
before they can be used on the production line.
2. Wrong position of feeder material
Some production lines work in two shifts, and some operators may be fatigued or negligent and cause the feeder station to be wrong. Then the placement machine will throw a large
amount of material and alarm. At this time, the operator needs to check quickly and replace the feeder. material station.
3. The reason for the pick-up position of the placement machine
The placement of the placement machine depends on the suction nozzle on the placement head to sequentially absorb the corresponding materials for placement. Some throwing materials
are caused by the trolley or the feeder and the materials are not at the position of the suction nozzle or have not reached the suction height. The placement machine will falsely pick up and
mount, and there will be a large number of empty stickers. In this case, it is necessary to perform feeder calibration or adjust the suction height of the suction nozzle.
4. Problems with the nozzle of the placement machine
Some placement machines run efficiently and quickly for a long time, and the suction nozzle will be worn out, which will cause the material to fall or fail to absorb, and a large amount of material
will be thrown. In this case, the placement machine needs to be maintained in time. Change the nozzle frequently.
5. Negative pressure problem of placement machine
The placement machine can absorb and mount components, mainly relying on the internal vacuum to generate negative pressure for suction and placement. If the vacuum pump or air pipe is
damaged or blocked, the air pressure value will be too small or insufficient, so that the components cannot be absorbed Or it falls during the movement of the placement head. In this case, the
throwing material will also increase. In this case, the air pipe or vacuum pump needs to be replaced.
6. The image visual recognition error of the placement machine
The placement machine can mount the specified component to the specified pad position, mainly due to the visual recognition system of the placement machine. The visual identification system
of the placement machine recognizes the material number, size, and size of the component, and then passes through the placement machine. Machine algorithm, mount the component on the
specified PCB pad, if there is dust or dust on the vision, or if it is damaged, there will be a recognition error, which will lead to an error in picking up the material, resulting in an increase in the throwing
of the material. In this case, the vision needs to be replaced recognition system.
To sum up, there are several common reasons for the throwing of placement machines. If there is an increase in throwing in your factory, you need to check accordingly to find the root cause. You
can first ask the on-site personnel, through the description, and then directly find the problem based on observation and analysis, so that you can find out the problem more effectively, solve it, and
improve production efficiency.
