SIPLACE Vision Customer_en.pdf - 第115页

Component Shapes SIPLACE Vision Flux Inspection – on ly in 605 SW New SIPLACE Vision Functions for 605 and 701 Station SW S tudent Guide SIPLACE Vision (Customer) Edition 12/2008 EN Component Shapes 11 5 These ar e numbe…

Component Shapes

New SIPLACE Vision Functions for 605 and 701 Station SW SIPLACE Vision Flux Inspection – only in 605 SW

Student Guide SIPLACE Vision (Customer)

Component Shapes Edition 12/2008 EN

114

5-19: The result diagram shows the calculated characterisitcs per ball.

 The ball numbers are given along the X axis (128 in this example). The calculated characteristic per

ball is given along the Y axis.

 The horizontal line in turquoise represents the threshold being set.

 All balls whose characteristics are below the threshold are shown in green in the result image (see

above).

 All balls whose characteristics are above the threshold are shown in red in the result image (see

above).

Parameterization

The parameterization is carried out on the station during shape component teaching using the algorithm

parameters in the programming area labeled

Flux inspection

Selection of the Analyzing Procedure

Initially, 2 procedures (brightness and homogeneity analysis) are provided as described.

Both procedures return a characteristic value per ball that is compared to a threshold. If the characteristic

exceeds the threshold, that is to be set here, the ball is characterized as insufficiently coated.

The procedures differ in the anlysis area.

Analysis is either carried out on the entire circular area, defined by means of DonutOuter (see 0 setting

of the evaluation area), or on the area of the circular ring (Donut), defined by means of DonutOuter and

DonutInner. Thus 4 different analysis variants are offered in total.

Component Shapes

SIPLACE Vision Flux Inspection – only in 605 SW New SIPLACE Vision Functions for 605 and 701 Station SW

Student Guide SIPLACE Vision (Customer)

Edition 12/2008 EN Component Shapes

115

These are numbered from 1 to 4 as follows

 Analysis of homogeneity on the circular area

 Analysis of homogeneity on the circular ring

 Analysis of brightness on the circular area

 Analysis of brightness on the circular ring

Choose the procedure, whose ball characteristics comply with the following requirements:

 The characteristics for dipped and un-dipped balls differ to a great extent.

 The characteristics for dipped and un-dipped balls differ to a small extent.

Setting of the Evaluation Area

2 parameters, refering to the ball diameter, are available for setting the evaluation area.

 DonutOuter defines the diameter of the circular area if the entire area is to be analyzed, or the outer

diameter of the circular ring is determined if only the ring is to be analyzed.

 DonutInner defines the inner diameter of the circular ring if this ring is to be analyzed. Otherwise it

has no meaning.

Both parameters are entered as the factor for the ball diameter.

Range of values:

 DonutInner: 0.1 to 1.0

 DonutOuter: 0.4 to 1.3 and > DonutInner + 0.1

Default Settings of the Parameters

Parameterization procedure

Parameterization is carried out during component shape teaching:

X Preparation in SIPLACE Pro:

Activate dipping for the component and flux inspection for the component shape. (Flux inspection

can also be activated in the component shape editor of the station. Dipping, however, can only be

activated in SIPLACE Pro.)

X Select the recipe.

X Switch to the station and launch

Teach Component Shapes.

Analysis procedure = 3 Analysis of homogeneity on the circular ring

Threshold = 35

DonutOuter = 0.8 0.8 * ball diameter

DonutInner = 0.4 0.4 * ball diameter

Component Shapes

New SIPLACE Vision Functions for 605 and 701 Station SW SIPLACE Vision Flux Inspection – only in 605 SW

Student Guide SIPLACE Vision (Customer)

Component Shapes Edition 12/2008 EN

116

X In a next step check the parameter settings for an undipped component. Switch back to the form

editor and re-activate dipping.

X Get the component and switch to the

Monitoring

Vision view.

If the position of the component cannot be detected because the component is too dark, the

illumination must be brightened up until the position can be reliably determined. Please brighten up

only to such an extent, that is absolutely necessary to detect the component.

X Select the

Flux diagram

view (see above).

In this view you have to check if the selected areas really show the greatest modifications through

dipping. Again, the differences between the characteristics should be as small as possible. The

threshold should be above all characteristics now (if they were set as described).

If this is not the case, either the parameterization has to be checked or it has to be checked if the flux

or solder paste is suitable.

If the threshold is comfortably above the characteristics it can be reduced to a value that enables

insufficiently coated balls to be detected earlier. The selected threshold depends on the conditions

and the process requirements at the customer's site.

X If the correct parameterization has been found, save it.

X Based on the existing patterns the distance of the characteristics between dipped and un-dipped

component should be at least 20 pixel for the contrast procedure and at least 40 for the brightness

procedure.

X The values for the characteristics and their differences between dipped and un-dipped depend on:

the properties of the flux, the surface properties of the balls, the height of the flux or solder paste in

the dipping unit, the dipping time, the selected analysis areas (via DonutInner and DonutOuter) and

the selected illumination.

5-20: Flux diagram

X Deactivate dipping in order to calculate the

characteristics for un-dipped balls.

Get the component and switch to the

Monitoring

Vision view. Select the

Flux

diagram

view (see the figure).

X This diagram shows the characteristics of all

balls and the differentiation threshold.

The selected detection procedure and the

parameterization of the evaluation areas

(DonutOuter and DonutInner) have an effect

on the characteristics.

It is the aim to find a setting that includes the

areas with the greatest modifications as a

result of the dipping. At the same time the

differences between the characteristics should

be as small as possible.

X Set the threshold to a value that is a bit lower

than all characteristics of the balls. Thus all

balls will be characterized as insufficiently

coated.

NOTE:

If the illumination is too bright the differentiation becomes worse because pixel on un-coated

balls may be overexposed. Overexposed pixel always have a gray value of 255 independent of

the extent of the overexposure. If the previously dark pixel also become very bright after

brightening the illumination, e. g. if a gray value of 40 augments to 200, the differentiation gets

correspondingly worse.