Page 31 - MetalForming January 2016

the virtual axes of the press and trans- fer must be electronically geared through proportional-integral-deriva- tive (PID) controller loop timing.
In contrast, if the press cannot pro- vide a virtual feedback, the transfer must follow the press via a series of gearing/ungearing sequences to avoid points of discontinuity in the profile. This type of control is not desirable— a means for virtual-axis feedback is preferred.
Choosing the Best Transfer Configuration
Before deciding on the type of servo technology needed, start by under- standing each system’s capabilities and limitations. What is your best choice, a front-and-back-mounted system or a through-the-window-style transfer?
A through-the-window transfer sys- tem often requires transfer hardware to be mounted on each end of the press. This solution can cause trouble for stampers using progressive dies, par- ticularly because their presses have press feeds positioned at the press, which would interfere with the transfer mounting, transfer bars and tools used to move parts.
To use a through-the-window trans- fer, the stamper would have to relo- cate the press feed, which increases the production footprint and could disrupt production workflow. Here, front-and-back transfers are a better solution—the module placement would not interfere with the press feed, keeping the current press-feed line intact.
Another factor: Based on the type of application, coil width can directly impact which servo-transfer solution to employ. With a front-and-back transfer, the modules take up far less real estate than an upright or through-the-win- dow transfer. The tooling bar travels the length of the through-the-window press with the size of the tooling bar often dictated by the left-to-right dimension of the press, with a longer length requiring a larger tooling bar. This leaves reduced space for coil width. A lack of proper coil-width space
reduces the range of automation capa- bilities on a press.
While both systems allow die access, a through-the-window transfer system is ideal if frequent access to the die is required. Transfer-drive mechanisms on both ends and the ability to uncou- ple the tooling bar ease access.
Front-and-back transfers are posi- tioned in front of or behind the die so that the module can be run and parked
in a full-up position for die access. However, when additional access is needed, longer transfer-mounting frames can be supplied, allowing the transfer module to be shifted laterally away from the press bed and parked in the offline position.
Systems Deliver Flexibility for Future Work
Full-servo through-the-window and
WHY WASTE PRECIOUS FLOOR SPACE?
Compact Heavy Duty Design Coil Thicknesses up to .470˝ Coil Widths up to 74˝
Auto Coil Loading System
Auto Straightening Correction
7–11 Rolls Design for Precision
Head Opening for Roll Cleaning Access
Designed for HSLA Steel Requirements
TP-CCS Control Interface offers:
– Centralized management data processing
– Programming, Change Over, Operation, Maintenance Modes
– Stable loop control positioning
– Fully automated system preset by part number
– ECO release, auto control of pneumatic cylinder pressure reducing energy
– Programmable punch gaging and feed length
ORIIMEC CORPORATION OF AMERICA
1840 Airport Exchange, Erlanger, KY 41018
Contact us: (888) 746-3320
For complete line of products and services visit: www.oriimec.com
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