HMT Mandrel Bending 101
Mandrel Bending 101
“The Basics”
• Machine
Bender Type and Condition
• Tooling
Design and Condition of tools
• Set-up
Proper Set-up and Adjustment
• Material
Material Type and Quality
• Lubrication
Proper Type and Amount
Tooling Terminology
Wiper Die
Bend Die
Mandrel
Pressure Die
Clamp Die
Master Collet and collet pads
Tooling Locations
Pressure Die
Mandrel
Collet
Clamp Die
Bend Die
Picture of HMT 5.0 Bender
Wiper Die
Bending Machine Terminology
PD Arm
Clamp Die
Holder
Y Axis Boost
Motor
Overhead
Tie Bars
Mandrel
Rod
Mandrel
Extractor
Pressure Die
Holder
Y Axis
Distance
DBB
C Axis
Bend Arm
DOB
Die Boss
Picture of HMT 5.0 Bender
Wiper Die
Holder
B Axis
Rotate
POB
Tube
Support
Principles:
Rotary Draw Mandrel Bending
Description:
“Tube forming process where the tube is drawn over a mandrel and formed around a radius die while supported on all surfaces ID and OD at the tangent point”
Principles:
Rotary Draw Mandrel Bending
“Main Concept”
• A balance of pressure must be achieved, so material can be put into a
“plastic” state and allow material to “flow” into the desired shape without undesired deformation.
Representative plastic strain distribution after bending
Principles:
Rotary Draw Mandrel Bending
“Two Laws”
1) The tube must be supported on all surfaces, ID and OD at tangent during bending.
Tangent Point
2) Tube must “Flow” over the mandrel. Principles:
Rotary Draw Mandrel Bending
1) The tube must be supported on all surfaces, ID and
OD at tangent during bending.
During bending, the tube is drawn over the mandrel while being supported on all sides.
This process induces high enough pressure to yield the material Mandrel supports tube on the ID
Bend Die supports tube on inside radius of tube OD and provides the radius forming size
Wiper Die supports tube on inside radius of Tube OD
Clamp Die supports tube on outside of
OD and locks tube into bend die
Pressure Die supports tube on the outside radius of tube OD
If
“The Basics”
• Machine
Bender Type and Condition
• Tooling
Design and Condition of tools
• Set-up
Proper Set-up and Adjustment
• Material
Material Type and Quality
• Lubrication
Proper Type and Amount
Tooling Terminology
Wiper Die
Bend Die
Mandrel
Pressure Die
Clamp Die
Master Collet and collet pads
Tooling Locations
Pressure Die
Mandrel
Collet
Clamp Die
Bend Die
Picture of HMT 5.0 Bender
Wiper Die
Bending Machine Terminology
PD Arm
Clamp Die
Holder
Y Axis Boost
Motor
Overhead
Tie Bars
Mandrel
Rod
Mandrel
Extractor
Pressure Die
Holder
Y Axis
Distance
DBB
C Axis
Bend Arm
DOB
Die Boss
Picture of HMT 5.0 Bender
Wiper Die
Holder
B Axis
Rotate
POB
Tube
Support
Principles:
Rotary Draw Mandrel Bending
Description:
“Tube forming process where the tube is drawn over a mandrel and formed around a radius die while supported on all surfaces ID and OD at the tangent point”
Principles:
Rotary Draw Mandrel Bending
“Main Concept”
• A balance of pressure must be achieved, so material can be put into a
“plastic” state and allow material to “flow” into the desired shape without undesired deformation.
Representative plastic strain distribution after bending
Principles:
Rotary Draw Mandrel Bending
“Two Laws”
1) The tube must be supported on all surfaces, ID and OD at tangent during bending.
Tangent Point
2) Tube must “Flow” over the mandrel. Principles:
Rotary Draw Mandrel Bending
1) The tube must be supported on all surfaces, ID and
OD at tangent during bending.
During bending, the tube is drawn over the mandrel while being supported on all sides.
This process induces high enough pressure to yield the material Mandrel supports tube on the ID
Bend Die supports tube on inside radius of tube OD and provides the radius forming size
Wiper Die supports tube on inside radius of Tube OD
Clamp Die supports tube on outside of
OD and locks tube into bend die
Pressure Die supports tube on the outside radius of tube OD
If