Manual

Chapter
1
1-1
Overview of the Clamp and Eject Mode
This chapter presents an overview of the 1771-QDC Plastic Molding
Module’s Clamp and Eject Mode. A summary of clamp and eject features
is followed by sample applications of the QDC Module in Clamp and Eject
Mode.
Important: This manual assumes you have already read your Plastic
Molding Module Application Guide (pub. no. 1771-4.10) and have chosen
Clamp and Eject as your QDC module’s mode of operation.
When you select the Clamp and Eject mode of operation, you can use the
following phases:
Table 1.A
Glossary
of Clamp and Eject Mode
Clamp Phase: Description:
1st Close
2nd Close
3rd Close
You can program a singlestep clampclose profile and not use a second or third profile. Or, you can program up to
three clampclose profiles that let you do the following at up to three different points in the clampclose phase:
• pick up a third mold plate
• set cores
• pick up or drop out pumps to change clamp speed or pressure
Low Pressure
Close
To guard against damaging the mold when the two mold surfaces make contact and to detect part obstructions, you
close the mold slowly with low pressure in closedloop or openloop control. Low Pressure Close can only be
controlled through a pressure vs. position profile.
1st Open
2nd Open
3rd Open
You can program a singlestep clampopen profile and not use a second or third profile. Or, you can program up to
three clampopen profiles that let you do the following at up to three different points in the clampopen phase:
• drop out a third mold plate
• pull cores
• drop out or pick up pumps to change clamp speed or pressure
Open Slow
To decelerate the moving platen to accurately position it before ejecting of the part.
Eject Phase: Description:
Ejector Advance You advance the ejector in a singlestep or in multiple steps using closedloop or openloop control. Multiple strokes
may be programmed.
Ejector Retract You retract the ejector in a singlestep or in multiple steps using closedloop or openloop control. Multiple strokes
may be programmed.
Tip Strokes You can shake the part off the ejector tip by programming rapid singlestroke interim ejector cycles starting after the
first advance stroke and ending before the last retract stroke.
Forward Dwell You can pause after the first advance stroke or before the last retract stroke to let a robot remove the part when the
ejectors are extended.
Chapter Objectives
Clamp and Eject Mode
Operation