FEC AFC3000 - Torque Rate Check

Chapter 7 Fastening Instructions
PAGE 7-32
7-3-2 Torque Rate Check
The AFC3000 System is capable of performing 3 torque rate calculations. The Point-to-Point torque rate
method performs the calculation based upon completing a step of the process and then calculating the
rate for the full duration of that step. If the calculated rate falls outside of the high / low rate limits for that
step, the fastening operation will end and a REJECT output.
The chart below identifies the different areas that torque rate can be calculated. Each Torque Rate is
calculated by dividing the change in torque during the specific period by the change in angle.
Example: 25Nm / 100deg. = 0.25 Nm/Deg. (rate)
NOTE: Setting any of the Torque Rate START POINTS above the FASTENING END TORQUE will
eliminate the torque rate calculation for that stage.
Torque Rate Calculation Areas (Typical for 1 or 2 step)
(3rd Rate Start and End Torque set above FASTENING END TORQUE )
STAGE
START POINT
STOP POINT
1ST TORQUE RATE 1ST RATE START TORQUE 1ST RATE END TORQUE
2ND TORQUE RATE 2ND RATE START TORQUE 2ND RATE END TORQUE
Torque Rate Calculation Areas (Typical for 3 step, however can be used on 1 or 2 step)
STAGE
START POINT
STOP POINT
1ST TORQUE RATE 1ST RATE START TORQUE 1ST RATE END TORQUE
2ND TORQUE RATE 2ND RATE START TORQUE 2ND RATE END TORQUE
3RD TORQUE RATE 3RD RATE START TORQUE 3RD RATE END TORQUE
For all control operations, the High and Low Torque Rate limits are set by determining the
acceptable limits from a study of known good and bad assemblies.
・
・・
・ If the 1
st
～
～～
～ 3
rd
Rate Start Torque is not detected during the fastening, the rate
judgment will not be performed.
・
・・
・ If the 1
st
～
～～
～ 3
rd
Rate End Torque is not detected during the fastening, the
torque value which is detected when the fastening ends is judged as 1
st
～
～～
～ 3
rd
Rate End Torque.