00198521-01_UM_LDU_E_EN.pdf - 第17页
3 Function description and structure 3.1 Function description User Manual SIPLACE Linear Dipping Unit E 12/2018 17 3 Function description and structure 3.1 Function description The LDU is set up on a changeover table in …
2 Operational safety
2.4 ESD guidelines
16 User Manual SIPLACE Linear Dipping Unit E 12/2018
3 Function description and structure
3.1 Function description
User Manual SIPLACE Linear Dipping Unit E 12/2018 17
3 Function description and structure
3.1 Function description
The LDU is set up on a changeover table in the same way as any other feeder module. The line
software (SIPLACE Pro) can be used to select components for dipping and to set the relevant
parameters. The LDU makes the flux available in a certain area, in the pre-defined amount (layer
thickness). The layer of flux is always renewed by automatically performed application runs. This
ensures that the components are dipped in a fresh layer of flux and that consistent process condi-
tions are maintained.
The LDU can be roughly divided into a mechanical section - an application unit - and an electrical
section - the so-called control unit.
Control unit
The control unit contains the electrical parts, such as the power supply, interfaces, the control sys-
tem and the operating unit.
Application unit
The application unit has two movement axes. The squeegee axis moves a slide unit back and forth.
The lift axis moves the lift unit up and down. Both of these axes are driven by electrical motors and
a spindle system. A rotary encoder on the motor shaft determines the current position of the
spindle. Both axes have sensors which indicate when the axis reaches its end position.
The application unit of the LDU consists of the
following main parts:
1. Flux tank
2. Park plate
3. Drip tray
4. Dip plate
5. Flux
6. Interface
7. Flux in the drip tray
8. Cavity
3 Function description and structure
3.1 Function description
18 User Manual SIPLACE Linear Dipping Unit E 12/2018
Application process
1. The application unit is in its basic position.
The flux tank is over the park plate, in the
park position. The tank has been filled with
new flux, which is now spreading over the
"base" of the flux tank. The dip plate is in
the application position.
2. The application begins. The slide unit with
the flux tank moves forward in the direction
of the dip plate. The flux in the tank forms
a roll, depending on its viscosity.
3. The flux tank reaches the dip plate cavity.
The flux is distributed in the cavity and
wiped off by the bottom edge of the flux
tank.
4. The slide unit moves to its reverse position
at the end of the dip plate. The whole cav-
ity is now filled with flux.
5. The slide unit moves back.
6. The flux roll now forms on the other side of
the flux tank. The edge strips off the layer
of flux applied to ensure that the flux layer
height remains constant.
7. The slide unit reaches the starting position
above the park plate. Any flux which may
have run into the gap in the interface area
will be caught by the drip tray.
8. The lift unit moves the dip plate out of the
application position and into the dip posi-
tion. The placement head can now dip the
components into the flux.
For the next application process the lift unit
moves the dip plate back in the application posi-
tion, then steps 1 to 8 will be repeated.