西门子SIPLACE S25 HM-设备性能参数_EN - 第28页

26 Description Various factors contribute to the placement accur acy of the SIPLACE S-25 HM machine, e.g., the stationar y PCB during the placement process. As no accel- erations are acti ng on the placed components, the…

Description

The standard component vision

module is directly integrated into

the Collect & Place Head. While

the component is cycling into the

next station of the Collect & Place

Head, the recorded image is eva-

luated by the central vision sys-

tem. The component rotation is

then corrected by the appropriate

angle based on the position off-

sets determined with vision in-

spection.

Vision Sensor Technology:

Standard Component Vision Modules for 12- and 6-Nozzle

Collect & Place Head

Standard Component Vision Module for the 12-Nozzle C & P Head

Maximum component size 18.7 x 18.7 mm

Component Range See table on page 6

Camera’s field of view 24 x 24 mm

Illumination Front lighting

(3 freely programmable planes)

Standard Component Vision Module for the 6-Nozzle C & P Head

Maximum component size 32 x 32 mm

Component Range See table on page 6

Camera’s field of view 39 x 39 mm

Illumination Front light

(2 freely programmable planes)

Description

Various factors contribute to the

placement accuracy of the

SIPLACE S-25 HM machine, e.g.,

the stationary PCB during the

placement process. As no accel-

erations are acting on the placed

components, their position contin-

ues unchanged. The PCB moves in

and out at a coordinated speed

which is automatically reduced just

before the nominal position is

reached.

A further guarantee for long-term

high placement accuracy is the

position recognition of the axes of

the gantry and placement head by

means of optical scanning by in-

cremental encoders. Revolving

star and segments of the Collect

& Place Head are positioned by

means of high-resolution glass in-

cremental panels. The X- and Y-

axes are positioned with the help

of the metal scales on each gantry

axis.

To determine the placement accu-

racy on SIPLACE machines, highly

precision glass components with

mounted structures are placed on

a dimensionally accurate glass

mapping plate. The results are sta-

tistically evaluated and presented

as a Gaussian standard distribu-

tion. In the case of the 6-Nozzle

Collect & Place Head at the

SIPLACE S-25 HM the placement

accuracy is ± 80 µm at a statistical

reliability of 4 sigma. In other

words, of one million placed com-

ponents, 60 are outside the speci-

fied tolerance (= 60 dpm). If the

accuracy value ± 80 µm is divided

by the sigma value 4, the result is

the standard deviation S of 1

sigma = ± 20 µm.

A machine capability analysis is

conducted for each machine ac-

ceptance test.

Machine Criteria:

Placement Accuracy

Technical Data Gantry

Drive Brushless AC Temperature

Controlled Motor

Position measuring system

(X/Y)

Linear scales

Resolution of X-/Y-axis 2.5 µm

Speed of X-axis max. 2.5 m/s

Speed of Y-axis max. 2.5 m/s

Placement Accuracy see table on page 6

Standard Deviation - dpm

-4

-3

-2

2700 dpm

60 dpm

P Point o

lection

Description

In addition to correct positioning,

placement reliability is important.

On the SIPLACE S-25 HM this is

ensured through a number of con-

trol functions, such as vacuum

checks and component vision

testing during the placement se-

quence.

Out of tolerance components are

rejected, placed on the repair list

and automatically processed dur-

ing a repair cycle. An offset in the

position of the PCB relative to the

conveyor system (PCB vision) and

an offset of the X-axis, Y-axis or ro-

tation of the component relative to

the midpoint of the nozzle (com-

ponent vision) trigger an immedi-

ate correction to ensure placement

accuracy.

Since the PCB is fixed, the com-

ponents remain in the exact posi-

tion they are placed. The stationary

component table ensures a pre-

cise pick up. Options, such as the

component bar code scanner, can

be added to further enhance reli-

ability.

Placement errors

Placement errorsPlacement errors

Placement errors

Errors that occur after the compo-

nent has been placed on the PCB.

They include:

§ Component is missed on PCB

§ Too many components on PCB

§ Components not placed prop-

erly on PCB

§ Components placed while

standing on edge

Machine Criteria:

Placement Reliability

Placement Principle of SIPLACE S-25

➀ 6-Nozzle or 12-Nozzle

Collect & Place Head

➁ X-/Y-Gantry System

➂ Fixed Component Supply

➃ Fixed PCB