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User manual SIPLAC E HF series 3 Technical data Software Vers ion SR.50x.xx 01/2006 US Edition 3.7 Placement heads 129 3.7.4.1 Descriptio n This sop histic ated placeme nt hea d consists o f two plac ement hea ds of the …

3 Technical data User manual SIPLACE HF series

3.7 Placement heads Software Version SR.50x.xx 01/2006 US Edition

128

3.7.4 SIPLACE TwinHead for high-precision IC placement

Fig. 3.7 - 9 TwinHead for high-precision IC placement

(1) Pick&Place module - the TwinHead consists of 2 Pick&Place modules

(2) DP axis

(3) Z axis drive

(4) Incremental distance measuring system for the Z axis

User manual SIPLACE HF series 3 Technical data

Software Version SR.50x.xx 01/2006 US Edition 3.7 Placement heads

129

3.7.4.1 Description

This sophisticated placement head consists of two placement heads of the same type coupled to-

gether (twin head). Both heads work using the Pick&Place principle. The TwinHead is suitable for

processing particularly difficult or large components. Two components are picked up by the place-

ment head, optically centered on the way to the placement position and rotated into the necessary

placement angle. They are then placed gently and accurately onto the PCB with a controlled blast

of air. 3

New nozzles (type 5xx) have been developed for the TwinHead. It is also possible to fit an adapter

and then use type 4 nozzles for the Pick&Place head and type 8xx and 9xx nozzles for the Col-

lect&Place heads. 3

Checking and self-learning functions 3

The TwinHead's reliability can be further increased with various checking and self-learning func-

tions. 3

– For example, vacuum checks at the nozzles indicate whether the component was picked up

or set down correctly.

– High-resolution, intelligent vision modules, such as the fine-pitch and flip-chip vision modules,

identify and correct minute deviations from the desired component position, thus guarantee-

ing a correct placement position. The component cameras are permanently fixed to the ma-

chine frame.

– The component package form is also checked, and the component is not placed if the geo-

metric data thus determined differs from the programmed data.

– A force sensor measures and monitors the specified component placement forces.

– If the compressed air or power fails, the vertical axis (Z axis) is raised to a safe position in

order to prevent a head crash.

3.7.4.2 Description of the functions

The TwinHead consists of two Pick&Place heads that are coupled to one another, but are con-

trolled independently. Each head has two axes - the Z and the DP axis (see Fig. 3.7 - 8

). 3

The traversing path of the Z axis is detected via a high-resolution, linear incremental measuring

system. The Z axis performs a vertical movement. A linear motor raises and lowers the Z axis,

and components are picked up from feeder modules or trays and lowered onto the PCB. The

Z axis is an "intelligent axis". It "notes" the pick-up height for feeder modules and trays and the

placement height for each component. This can speed up the placement process. The pro-

grammed placement force is measured and monitored by a force sensor. 3

3 Technical data User manual SIPLACE HF series

3.7 Placement heads Software Version SR.50x.xx 01/2006 US Edition

130

The DP axis rotates the optically centered component to the desired placement angle. The ro-

tation axis is driven by a stepping motor. The motor shaft is designed as a sleeve. At the top end

is the incremental disk for angle analysis, while the nozzle holding device is at the bottom end. 3

The sequences of movements of the rotation and translation axes are controlled by control cir-

cuits. Position and speed sensors send the actual values for the axis movement to the axis con-

trol. The setpoint and actual values are compared and used to determine the force and speed

parameters for the servo amplifier, and thus the axis movement to be performed. 3

The vacuum values at the nozzle are constantly checked throughout the entire pick-up and

placement process in order to keep the placement error rate as low as possible. 3

Fig. 3.7 - 10 Description of the functions