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volume 18 - issue 1 - Finn-Power International, Inc.

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TECH TIPS<br />

<strong>Finn</strong>-<strong>Power</strong> Part Removal Options<br />

There are many different part removal options for <strong>Finn</strong>-<strong>Power</strong>’s family<br />

of turret punch presses, combination machines, and lasers. These<br />

options need to be selected carefully. You should determine your<br />

need for machine time availability versus part sorting and stacking<br />

requirements to ensure the most efficient use of your equipment. Remember,<br />

one operation directly affects the other. For example, overall cycle time is<br />

increased when the machine is sorting and stacking parts, depending on the<br />

operation and the availability of a buffering option. Depending upon part size<br />

and hole and feature intensity, the machine may be able to produce parts<br />

faster than the machine can buffer, sort, and stack them.<br />

Depending upon the machine or system, the options begin with simple<br />

manual part removal and range from fully-automated flat stacking on pallets<br />

to automated storage systems.<br />

Machine Part Removal Options<br />

Manual removal and micro-jointed parts in full sheets – An example of<br />

efficiency improvement, which is dependent upon your part removal options,<br />

is removing parts as individual pre-cut blanks compared to nesting multiple<br />

parts on a sheet. The result is that the unload time is for one sheet of 10<br />

micro-jointed parts rather than 10 individual single part unloads.<br />

Easy-Snap microjointing<br />

– The use of<br />

scrap-less part<br />

retension or Easi-Snap<br />

tools further enhance<br />

micro-jointed part<br />

removal by jointing<br />

the scrap to the parts<br />

rather than breaking<br />

them out of the<br />

skeleton. Nested<br />

micro-jointed parts<br />

can be stored and<br />

broken out later outside of the machine cycle.<br />

Common-line, micro-jointed nests save even more<br />

time and give better material utilization.<br />

Trap door to bin removal of individual part sizes<br />

500 mm (19.5" ) square – Another part removal<br />

option available is that of a trap door. The current size<br />

takes a 19.5" (500 mm sq) blank. This part removal<br />

option allows for the automatic removal of parts from<br />

the material skeleton into a box after the last punch hit or laser cut often via<br />

conveyor without operator intervention. Again, you must balance the<br />

trapdoor unload time off against the extra machine cycle time that it takes up.<br />

As an option with the <strong>Finn</strong>-<strong>Power</strong> NC Express software, the trap door can be<br />

automatically programmed with a variable delay to stay open for all or some<br />

parts, thereby significantly reducing the trap door cycle time. Part pickup and<br />

The FINN-ISH LINE is a publication distributed to <strong>Finn</strong>-<strong>Power</strong> customers,<br />

prospective customers, employees, dealers, suppliers, and friends. The staff of the<br />

FINN-ISH LINE requests article ideas and letters for future publication.<br />

Editor Robert J. Kolcz rjk@finnpower.com<br />

Associate Editor Tiina Ayaydin tiina@finnpower.com<br />

Technical Editor Lutz Ehrlich lehrlich@finnpower.com<br />

Contributing Editor Andrew McCarlie mccarlie@finnpower.com<br />

Senior Correspondent Timo Laurinen timo.laurinen@finn-power.com<br />

All registered trademarks in this publication are property of their respective owners.<br />

2<br />

by Andrew McCarlie, Applications Engineer<br />

placement is not significantly affected by forms and holes on the part<br />

profile and to a lesser degree material flatness.<br />

Pick and place robots removing parts<br />

from the sheet skeleton during part<br />

processing and stacking on pallets.<br />

LSR/PSR/LST – This is an option that is<br />

typically used on punch presses and<br />

laser/punch combination machines. The<br />

part-picking robot typically picks a part<br />

out of the sheet skeleton after the last<br />

punch hit frees it from the sheet. It is then<br />

stacked onto a pallet which can then be<br />

feed into an automated storage system if<br />

required. Much larger parts can be<br />

extracted from the sheet using this option.<br />

The time required for the robot /<br />

unloader to extract the parts from the<br />

sheet must be taken into account in the<br />

overall part cycle time. Also part pickup<br />

and placement is dependent upon the<br />

number of cutouts and forms present on<br />

the part profile as well as material flatness.<br />

Pick and place robots stacking<br />

skeleton free finished parts from a buffer<br />

to a pallet. SGR/SBR – This unload<br />

option can function while the machine<br />

SG/SB is still processing parts until the<br />

buffer is full. The parts are cut completely<br />

from the skeleton which is cut up<br />

allowing a truly skeleton free operation.<br />

The finished parts are then stacked onto a<br />

pallet which can be off-loaded manually<br />

or attached to an automatic storage<br />

retrieval system.<br />

Skeleton unloader systems that<br />

unload a full skeleton of micro-jointed<br />

parts to a pallet such as on the Compact<br />

Express, SG/SB/LP and Laser machines –<br />

These unloading systems can be used as<br />

the single main parts removal option on a<br />

machine such as a compact express or as an extra unload option as part<br />

of an SG or LP system. The parts can be broken out of the skeleton<br />

outside of the machine cycle. This method of unloading is less sensitive<br />

to material variation and part profiles.<br />

Stacking/sorting/bin systems that stack skeleton free parts to a<br />

pallet or bin. SG/SB STS systems – These two types of part removal<br />

systems allow for removal of complete parts up to a certain size in the<br />

case of the sorting bins. Both systems take time up from the processing<br />

time to sort and stack the parts. The bin system has the advantage of<br />

being quicker but is limited in size to 30" x59" . Scrap is tabbed to the<br />

parts to provide for quick release and to avoid extra scrap punch hits<br />

thereby speeding up the process cycle time. The finished part goes<br />

directly to the next operation with no micro-joint removal.<br />

Punch part removal using the punching slug chute – This<br />

method can be used on all punching machines and involves using a<br />

large rectangle (1" x3" – 25 mm x 75 mm) as a mini right angle shear<br />

to free parts that fit inside the size of the punch. This is done by<br />

sequencing this large rectangle to be the last hit in the punching<br />

sequence. The freed part goes through the die down the slug chute and<br />

out the slug conveyor. The operator diverts these slugs which are small<br />

parts from the slug conveyor into a separate container as they fall out.

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