Preventing deviations and missing parts for part placements | Causes of unstable placement quality and solutions
Home > Solutions > Preventing deviations and missing parts for part placements | Causes of unstable placement quality and solutions
Why do placement defects persist even though the pick and place machine is highly accurate?
Have you experienced placement deviations and raised parts even though the placement accuracy should be fine?
In actuality, placement defects are not only caused by the accuracy of a pick and place machine.
For example, all of the following factors affect the placement quality.
- Slight deviations in the pickup position or pickup height
- Over pushing parts or scattering caused by panel warpage
- Use of parts with defective shapes or have an expired floor life
- Incorrect placement due to setup mistakes or parts with the wrong electrical properties
- Failure to detect quality degradation
Therefore, it is difficult to eliminate defects entirely through improvements in the specifications of the pick and place machines alone. This makes it is crucial to effectively manage changes in parts, panels, equipment, and work processes.
In recent years in particular, due to the increasing use of very small parts such as 0402 (01005") parts, and high density placement on panels, even slight pickup issues or changes in placement force frequently lead to deviations, part damage, or solder bridges.
In addition, quality control that does not depend on the experience of the operator is also an important issue in workplaces where labor shortages are increasing.
What measures are necessary to reduce placement defects?
Various multifaceted measures such as the following are necessary in order to ensure consistent placement quality.
- Detecting and eliminating pickup defects
- Managing placement loads based on the panel warpage
- Preventing use of parts with defective shapes and incorrect parts
- Checking quality immediately after placement
- Detecting signs of dropping quality trends and performing prevention management
Concrete measures for improving placement quality
In the materials, "For improving placement quality", there are easy to understand explanations for the following concrete measures.
- Preventing position deviations, parts tombstoning, and missing parts
- Preventing defects due to panel warpage
- Preventing part damage and solder bridging
- Preventing incorrect placements and operation mistakes
- Maintaining quality through linking with AOIs and detecting trends
If you are facing challenges such as wanting to reduce placement defects, wanting to stabilize quality, or wanting quality control that does not depend on people, take a look at these materials.
