Chapter 7 Fastening Instructions
PAGE 7-7
<Torque Control Method・
・・
・Three-step Fastening>
P
Three-step fastening will be used primarily for joints that have a requirement to synchronize with
another spindle during the incremental stages of the rundown to crush/compress a gasket or
grommet or for special joint conditioning. Examples: valve cover, oil pan, or body assembly.
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 and the synchronization point prior to
commencing the next step.
4. The system will fasten to 2ND TORQUE/ANGLE, synchronize with other spindles, shift to
3RD SPEED and 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, 2
nd
Speed start point
and synchronization point for the
2
nd
step.
SNUG Torque
Used for angle measurement start point.
Set the value when the torque increase gets stable after fastener seating.
2
Torque
2
ND
Angle
Set this torque 60% of the Standard Torque
3
rd
Speed start point and synchronization point for the 3
rd
step.
Standard Torque Engineered product fastening specification
1
1
ST
Time Low Limit
The high and low limits from starting the fastening to detecting 1
or 1
st
Angle.
2
2
ND
Time Low Limit
The high and low limits from detecting 1
Torque or 1
the Standard Torque.
Three-step Fastening
Function
Start Point Halt Point
fastening
1
Step Start of operation 1
Torque / 1
Angle 1
Time Low Limit / High Limit
2
Step 1
Torque / 1
Angle 2
Torque / 2
Angle
2
nd
Time Low Limit / High Limit
3
Step 2
Torque / 2
Angle
Standard Torque
※
Stop temporarily when 1
st
Torque or 1
st
Angle is detected and when 2
nd
Torque or 2
nd
A
detected. Enable to set to synchronize with other spindles. 2
nd
step and 3
rd
step of three-
fastening are done within the same range of time duration (2
nd
Time).
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