FEC AFC1200 User Manual
Page 12
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w Integrated Yield Method Fastening
P After presetting the fastening sequence (Section 7.5 SET SEQUENCE) to perform
the desired number of steps, the System fastening parameters (Section 7.1
PARAMETER SET) must be configured according to the Engineered fastening
specification.
P Multiple-step fastening will be performed according to the Torque and Angle
Control method procedures. Integrated Yield control will begin when the fasteners
have attained or exceeded CROSSOVER RATE 2 (TORQUE or ANGLE). No
incremental steps may be performed which will occur after the commencement of
the Integrated Yield control (CROSSOVER RATE 2). It is therefore highly
recommended that Yield control operations be restricted to no more than two (2)
steps.
P For a standard two-step operation the System will fasten to 1ST TORQUE/ANGLE
during the specified 1ST STEP time. Once either SPEED CHANGE TORQUE or
1ST TORQUE/ANGLE is reached, the System will switch to the specified TORQUE
SPEED (SECTION 6.3). When all fasteners have reached 1ST TORQUE/ANGLE,
the spindles will synchronize and then fasten simultaneously until the desired bolt
stretch has been reached, within the specified FINAL STEP time. Once
CROSSOVER RATE 2 is attained or exceeded, the actual torque rate (for a period
equal to the preset elongation angle [ANGLE]), is compared to the preset YIELD
RATE. When the actual torque rate is equal to or less than the preset YIELD
RATE, then the proper bolt stretch has been obtained.
NOTES: Setup for Torque and Angle Control items are detailed in their respective
sections.
Yield control method cannot be configured properly without first performing
extensive testing on the joint.
Start point of integrated yield method. Set based
upon extensive testing
CROSSOVER RATE 2 (TORQUE/ANGLE)
Compensation factor for calculated bolt stretch. Set
based upon extensive testing
CONSTANT
Expectant torque rate of fastener when proper bolt
stretch has been obtained. Set based upon
extensive testing
YIELD RATE
Engineered fastener rotation into yield specification.
Automatically set when "LENGTH" is set
ANGLE
Engineered fastener permanent elongation
specification. Automatically set when "ANGLE" is set
LENGTH
Fastener specification
SCREW PITCH
RECOMMENDATION
FUNCTION
Chapter 6: Fastening Instructions
Page 6-12