00198763-02_VD_SIPLACE_Pro_17.1_R20-1_EN_DE.pdf - 第21页
SIPLACE Pro 17.1 (R 20-1) / Versi on Description 05/2020 Edition 21 Figure 4-5: Setting tolerances for critical pairs Additionally, in the Preced ences tab of the Board Editor, you can sp ecify as of which hei ght differ…
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4.4 Handling of Critical Pairs in High Density Placement
When placing components with minimal gaps in between (High Density Placement), specific
placement problems may arise. For example, it might be possible that there are minor height
variations in component heights that could be caused due to their manufacturing process or differ
between batches. These minor component height variations can cause nozzle collision as shown in
the figure below:
Figure 4-3: Example for a nozzle collision caused by height variations
It might also occur that components shift on the nozzle during placement, causing placement error
due to the minimal space between the components as shown in the figure below:
Figure 4-4: Example for placement errors
Adjacent components that might cause such problems are referenced to as “critical pairs”.
To better support high density placement and the handling of such critical pairs, the Precedence
Finder module in the SIPLACE Pro Optimizer has been extended by a “Critical Pair Finder”
functionality. This Critical Pair Finder checks if components are considered critical pairs based on
tolerance values that have been defined for the gap distance between components and their
component height. The tolerance values can be specified in the Critical Placement Pairs tab that
has been newly added to the Settings menu.
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Figure 4-5: Setting tolerances for critical pairs
Additionally, in the Precedences tab of the Board Editor, you can specify as of which height
difference between components the station should heed the placement sequence specified by
SIPLACE Pro Optimizer. This value can be specified and saved individually for each board side.
Figure 4-6: Setting height value for when to check preferences
NOTICE
The placement sequence for critical pairs is decided at the station, and therefore is not
simulated during optimization.
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4.5 Selecting Accuracy Per Component Placement Position
It is now possible to select individual accuracy values per placement position. With this feature, you
can define which components need to be placed with a different accuracy than defined in the
component shape definition, e.g. for high density placement.
In the toolbar of each placement list a new cross hairs icon has been added. In the placement
list a new “accuracy settings” column has been added. The header of this new column also
contains the cross hairs icon from the toolbar. By clicking the new icon in the toolbar or by checking
at least one item in the new “accuracy settings” column, the three columns Accuracy Mode,
Accuracy and Deviation, which are also related to placement accuracy, are made visible and
highlighted in color in the placement list. By default, these accuracy related columns are hidden.
Figure 4-7: New “accuracy settings” columns in placement list
NOTICE
In order to change any accuracy values, you need to activate the Expert Mode under
Tools – Settings – User Options.
4.6 Configuring Settings for Sensitivity of Nozzle Verification
It is now possible to configure in how much detail nozzles are scrutinized during nozzle check. This
new feature can be used, for example, to adjust the nozzle check according to your specific quality
requirements for nozzles. It can also be used to better identify contamination of the nozzle – like
solder contamination – even if just the tip of the nozzle is contaminated.
The sensitivity level of the nozzle check can only be adjusted for a whole production line. To select
a sensitivity level, use the Nozzle Inspection Sensitivity list in the Setup editor of SIPLACE Pro
Desk.
Figure 4-8: Settings for sensitivity level of nozzle check in SIPLACE Pro