Maintenance (Micron) workbook Iss07.pdf - 第69页

Issue 6, Nov 14 69 Squeegee Pressure Dek printers utilise a pressure monitoring and feed back system, which ensures that the pre ssure applied to the squeegees is the same as that whi ch is programmed. However, if differ…

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68 Issue 6, Nov 14
Cycle Time
Cycle time 1 (Left to Right/Right to Left) is time from board being received from Upline to same board being
released to Downline.
Cycle time 2 (Left to Left/Right to Right) is time from board arriving at board stop to board on next cycle
arriving at board stop.
Board Received by Machine
= C
y
cle Time starts
Board Exits Machine
= C
y
cle Time sto
p
s
CYCLE TIME 1
Board Received at Board Stop (1)
= Cycle Time 1 starts
Board Received at Board Stop (2)
= Cycle Time 1 stops and Cycle Time
2 starts
CYCLE TIME 2
Board
stop
CYCLE 1
CYCLE 2
Issue 6, Nov 14
69
Squeegee Pressure
Dek printers utilise a pressure monitoring and feedback system, which ensures that the pressure applied to
the squeegees is the same as that which is programmed. However, if different length squeegees are fitted or
the material hardness changes it may take one or two prints for the pressure to re-stabilize.
Average pressure across print stroke
SPC output
Programmed
Pressure + feedback
5Kg
Stroke 1
Stroke 2
Stroke 3
Stroke 4 etc.
Pressure Feedback
70 Issue 6, Nov 14
Objective BT2: Set up machine for benchmark test
Load the 265test1 product file and ensure that the following parameters are set
correctly:
• Front Print speed 25 mm/s
• Rear Print speed 25 mm/s
• Front Pressure 5kg
• Rear Pressure 5kg
• Separation Speed 1 mm/s
• Under Clearance 20mm
• No paste dispense or Screen Cleaner rate
• SPC Configuration :
¾ Data output rate = Every cycle
¾ Start Rate = 1
¾ Sample Rate = 0
¾ Start Rate Limit = 0
¾ SPC data mode = Disc
¾ SPC Format = Windows
¾ Update On Start = No
¾ Align Inspect mode = Post
Ensure that the following hardware is set-up correctly:
• 9 Tooling support pillars are used
• Squeegees fitted are of the correct length to suit board and heights calibrated
• DEK alignment test board (Part Number 137071) is used
• Screen loaded is the calibration/dry align screen
• Transport mode – No Transfer
Adjust machine parameters for benchmark test
• Transport Mode Left to Left (or Right to Right)
• Upline Protocol No FMI
• Downline Protocol No FMI
• Screen size 265