LCR7000 & RHEOSIGHTS P/N: 974194 |
Rev: A
|
ECO: 52468
www.dynisco.com
From lab to production,
providing a window into the process
-86-
•
The pressure reservoir is clean
•
The pressure transducer is mounted in barrel and snug
(100 in-LB torque)
•
The cross head is at the Park position (Up and away from plunger)
•
The rheometer is "locked in" at test temperature
•
The PT is an active sensing device, Press R-CAL on panel
Check the die by doing the following:
Perform a quick visual inspection of the die. The die bore and finish of the bore are critical.
There should be no visible tool marks. Top and bottom surfaces should be flat and smooth.
Clean the die. The die should be extremely clean. Clean the
cold
die with drill bits and solvent if
needed. (Any die that has been in use will need it!). Do not clean the die with the Go No-Go pins!
Select the Go No-Go pin needed. For example, for a nominally 0.030" die choose the ASTM
0.030" pin set. If you have a 1.0 mm die choose the ISO 1.0 mm Go, No-GO gage. The
Indexer checking pins should be 0.0823" (GREEN) and 0.0827" (RED) in diameter.
Carefully attempt to put the green side of the gage into the top end of the die. The pins are
hardened steel but can be worn down. They are made to 0.0010 mm tolerance. Do not
wear them down by forcing them into a die. The pin should go
all the way through
the die
without
being forced. Remove the pin and enter through the bottom side of the die as well.
If the pin will not go
all the way through
either end of the die, it fails to meet the
specifications. Verify you have the correct nominal dimension and reject the die if it does
not pass. (DO NOT USE THIS DIE). CHECK BOTH ENDS OF THE DIE WITH THE PIN!
If the green side of the gage goes through both ends of the die then attempt to put the red
side pin into the die. Be sure to check both ends. If the RED pin enters more than 1 mm into
the die on either end the die is rejected. Verify you have the correct nominal dimension and
reject the die if it does not pass this test. (DO NOT USE THIS DIE). Getting to this point
without rejecting the die means is has passed ASTM specifications listed in ASTM
D3835-90 for capillary rheometer dies or D1238 specs for melt indexers.
The die may also be good enough to meet the ISO specifications. This check can be made
using the ISO equivalent Go No-Go pin. (For a nominal die dimension of 0.030" the ISO
0.03" gage would be used). Check to be sure the green side goes through both ends as
before and the red side goes in less than 1 mm on each end. If it passes, the die is a valuable
commodity and should be marked as meeting ISO specs. If it has not passed the ISO pins
but passed the ASTM pins it should be marked as meeting ASTM specs.
6.
Dimensional Verification
7.
Die Diameter
