SIPLACE 80 F4_EN - 第33页

32 Description Despite the hi ghly st able ma chine frame, slight distortions of the gentry axes cannot alway s be avoided. With the aid of the ma p- ping process the high placement accuracy of the machin e is pre- serve…

Description

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Aside from correct positioning,

placement reliability also means a

gentle handling of the compo-

nents, so that these can be sol-

dered well later. Rework is mini-

mized or eliminated as a result.

On the SIPLACE 80 F

among

others this is ensured through a

number of control functions, e.g.,

the vacuum checks and compo-

nent vision test during the revolver

head sequence.

Unsuitable components are re-

jected, placed on the repair list and

automatically processed during a

repair cycle. An offset in the posi-

tion of the PCB relative to the con-

veyor system (PCB vision) and an

offset of the X-axis, Y-axis or rota-

tion of the component relative to

the midpoint of the nozzle (com-

ponent vision) trigger an immedi-

ate correction and thus placement

accuracy.

Thanks to the motionless PCB the

components remain in the exact

position they were placed. The

stationary component table pro-

tects, for example, the compo-

nents in Bulk Cases against dam-

age such as may occur due to

vibrations which are inevitable with

other placement concepts. Op-

tional add-on products ensure fur-

ther reliability: With the aid of the

component bar code scanner, the

correct placement program is

automatically sent to the station.

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All errors which occur between the

time the component is picked up

and the time it is placed on the

PCB are pick-up errors. They in-

clude:

No component in the tape

Component cannot be removed

from the tape.

Vacuum error

Vision error due to faulty com-

ponent

Vision error due to unrecognized

component

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Errors which occur after the com-

ponent has been placed on the

PCB. They include:

Rotation error

Too many components on PCB

X/Y-offset

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When used alone on the SIPLACE

80 F

the 12-nozzle revolver head

achieves a benchmark placement

rate of 10,000 components per

hour (cph). The Pick & Place head

places at a max. speed of 1,800

cph. These benchmark rates can

be verified on the demonstration

PCB at Siemens.

Factors such as PCB size, number

of components per board and their

layout have a certain effect on the

speed in actual practice. The

placement speed in practice can

be predicted using a calculation

program.

Machine Criteria:

Placement Reliability and Placement Speed

Placement Principle SIPLACE 80 F

Pick & Place Head

PCB Transport

Direction

Revolver Head

X/Y-Gantry

System

Fixed PCB

Fixed Component

Description

Despite the highly stable machine

frame, slight distortions of the

gentry axes cannot always be

avoided. With the aid of the map-

ping process the high placement

accuracy of the machine is pre-

served throughout its entire serv-

ice life.

With this calibrating procedure,

which can be conducted quickly

and easily, the PCB camera recog-

nizes the fiducials on a mapping

calibration plate placed in its oper-

ating area. Any distortions are re-

vealed by comparing the nominal

grid on the glass plate with the ac-

tual grid “drawn” by placement

head. These distortions are taken

into account during all further posi-

tioning of X-/Y-axes and thus com-

pensated for.

Machine Criteria:

Mapping (Option)

Technical Data

Dimensions of the mapping

test plate

520 x 460 mm (for single conveyor)

520 x 215 mm (for dual conveyor)

Number of measurement

points

13 x 11 (standard resolution)

26 x 21 (high resolution)

Ambient temperature during

calibration + 20° ± 3°C

Components of the option

Test plate (special glass)

Calculation data (disk)

Case for secure storage

Nominal Grid of Mapping Plate and Actual Grid with

Deviations Due to Gantry

Corrected

Position

Description

The control software is coordi-

nated with the modular architec-

ture of the SIPLACE production

line. It is based on a high-level real-

time multitasking operating sys-

tem which is optimally suited for

the control of time-critical proc-

esses in the placement machine.

Window technology and Touch-

Screen operator interface facilitate

handling with the line and station

computers which cooperate

closely in dividing the tasks to be

performed. The context-sensitive

on-line information and help sys-

tem comments on current events

in writing and graphics, for exam-

ple, and offers short information

about button in the toolbar or in

menu entries.

The UNIX multitasking operating

system of the line computer

makes it possible to perform more

than one work sequence at a time.

While the population of a PCB is in

process, for example, it is already

possible to determine the opti-

mized layout of the feeders for the

next PCB type (set-up optimiza-

tion). It is also possible to edit in

several windows or to look into the

MDA/PDA data without affecting

the placement speed. When pro-

duction planning is physically and

organizationally separate from the

production department, it is advis-

able to use a second line computer

as an off-line programming

system.

SIPLACE Software Architecture:

System Architecture

Technical Data

Operating system:

Line computer

Station computer

Machine controller

SCO UNIX

Microsoft

Windows with Touch Screen

RMOS

Realtime Multitasking Operating System

Support On-line information and help system

Graphic Operator Environment