FEC AFC3000, Hardware Operation Manual

Page: 170 / 294

Chapter 7 Fastening Instructions
PAGE 7-3
7-2 Fastening Methods
The AFC3000 System is user programmable to select from two different fastening methods, referred to as
Torque Control and Angle Control methods. Each control method can be performed in 1 to 3 incremental
steps, which will successively secure the fastener to the specified torque or angle values.
NOTE: All setting recommendations are based upon common fastening applications. Applications
that experience high prevailing torque, excessive joint compression or other unique characteristics
must be set with these characteristics in mind.
7-2-1 Torque Control Method (Angle Monitoring)
In Torque Control method, fastening is performed based upon attaining a desired torque value within
one to three incremental steps, while monitoring the degrees of rotation (Angle) of the fastener and time.
Additional check items (limits, rate, time, etc.) can be set to enhance the systems ability to determine if
the fastener was properly secured (Section 7-3).
<Torque Control Method
・
・ ・
・
One-step Fastening>
P
One-step fastening will be used primarily for joints which have no requirement to synchronize with
another spindle during the final stage of the rundown. Examples: Pipe Plugs, Spark Plugs, single
spindle applications.
1. Once RAMP DOWN START TORQUE is reached or FREERUN REVOLUTIONS expires,
the system will switch from FREERUN SPEED to 1ST SPEED and continue to fasten to 1ST
TORQUE/ANGLE.
2. The system will fasten to the 1ST TORQUE/ANGLE value during the specified 1ST TIME.
1ST TORQUE/ANGLE must be reached within the 1ST TIME limits or a reject will occur.
3. Upon reaching 1ST TORQUE/ANGLE, 1ST TIME ends and 2ND TIME begins. 1ST
TORQUE/ANGLE is the shift point to 2ND SPEED.
4. Upon reaching 2ND TORQUE/ANGLE the system with shift to 3RD SPEED. The system will
then fasten to STANDARD TORQUE. STANDARD TORQUE must be reached within the
2ND TIME limits or a reject will occur.
Fastening Parameter
Function
Ramp Down
Start Torque Set this torque 10% of the Standard Torque or 30% of SNUG Torque.
Set the value right before fastener seating.
1
ST
Torque
1
ST
Angle
Set this torque 30% of the Standard Torque or 80% of SNUG Torque.
1
st
Time end point and 2
nd
Speed start point.
SNUG Torque
Used for angle measurement start point.
Set the value when the torque increase is stable (after fastener seating).
2
ND
Torque
2
ND
Angle
Set this torque 60% of the Standard Torque
Used for 3
rd
speed start point.
Standard Torque Engineered product fastening specification
1
ST
Time High Limit
1
ST
Time Low Limit
The high and low limits from starting the fastening to detecting 1
st
Torque
or 1
st
Angle.
2
ND
Time High Limit
2
ND
Time Low Limit
The high and low limits from detecting 1
st
Torque or 1
st
Angle to detecting
the Standard Torque.
One-step Fastening
Function
Starting Point Stop Point
Range of the duration of
fastening
1
st
Step Start of operation Standard Torque
1
st
Time Low Limit / High Limit
2
nd
Time Low Limit / High Limit
※
The synchronization between spindles at 1
st
torque or 1
st
angle is not available.