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NX MULTI AXIS MACHINING
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© UGS Corp. 2004. All rights reserved.
Multi-Axis Machining Concept
2
Key Elements
Machine
Various type of configurations
Choose the right configuration for the right job
Controller
Most well-known controllers provide excellent features
Every contoller has its own strength in specific area
CAM System
Not every CAM system is equal
NX is among one of the best
Knowledgable and Experienced People
People make things different
3
Machine Type and Configuration
C Frame
Gantry
Dual Rotary Tables
Dual Swiveling Heads
Table Head
Non-Orthographics
Turn-Mill
Hexapods
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Kinematic Relative Spacing
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X
Z
C-Frame Table-Head Configuration
Work Piece Table
Light to medium weight work piece
Minimize work piece movement
Minimize axes stack up
Easy work piece setup
Good visiblility
Spindle Head
Extra X movement required when spindle swiveling about Y axis
The longer the tool, the more extra X movement required
Tool length matter
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Dual-Table
Rotary Tables
Lightweight work piece
Work piece stack up
Reduce stiffness
Extra linear movement on both X, Y, Z
Work piece setup consideration
Linear axis traverse limit
Collision between moving components
Tool axis always parallel to linear axis
Good for tool axis moving back and forth intensively operations, such as drilling and tapping
B
C
Non-OrthographicB 45° between Y and Z
Non-OrthographicB 45° between Y and Z
X
Z
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Dual-Head
Large size and heavy work piece
Easy work piece setup
Tool length matter
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Gantry Dual-Head 3 Spindles
Hugh size work piece, heavy duty
Machine three parts at the same time
Tool length matter
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Rotary Table
Flexible Rotary axis stack up on work table
Accurate installation and setup must be ensured every time
Beware of extra space needed for attached moving control unit
Rotary table manufacturer not necessary the machine manufacturer, need to understand how rotary axis synchronize with linear axis
10
Turn Mill
Eliminate multi-setup for turning and milling
Mainly for turning
Milling operation might not as efficient as milling machine
Might not suitable for part that has large percentage of milling operation
Turning TimeTurning Time
Setup TimeSetup Time
Milling TimeMilling Time
Small % of milling operationSmall % of milling operation
Large % of milling operationLarge % of milling operation
Turn MillTurn Mill
Turn + MillTurn + Mill
Turn MillTurn Mill
Turn + MillTurn + Mill
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Hexapods
6 DOF
Commercial acceptance has been slow, long way to go
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Right Tool for The Job
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Multi-Axis Machining
Fixed-Axis Machining means tool axis or workpiece orientation is fixed and will not change during the machine operation.
Multi-Axis Machining implies at least one rotary axis is involed, however …
Utilizing a multi-axis machine not necessarily mean the rotary axis must be moving simultaneously with other axis
In many cases the rotary axis position the part or tool axis to a fixed orientation, then perform a Fixed-Axis Machining
Most of machinery parts Engine housing, gear-box …
Choose the most appropiate machining strategy
Ask why one strategy is better than the other. For example: The main goal of rough cut is to remove large amout
of material in minimum time. We might ask why multi-axis for roughing is better than fixed-axis. If the answer doesn’t fit the goal, we might need to revise the strategy
14© UGS Corp. 2004. All rights reserved.
FA Machining with MA Machines
15
Plannar Milling
Specify tool axis orientation
Circular Output
Non-swivelling head usually has no problem handling circular interpolation
Swivelling head
Depends on controller and machine
Might need to output linear motion only
Post-processor handle the circular to linear conversion
Tolerance matter
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Drilling
Tool Axis Options
+ZM Axis
Specify Vector
Normal to Part Surface
Use Arc Axis
Canned Cycle
Non-Swivelling head usually has no problem handling canned cycle
Swivelling head
Depends on controller and machine
Might need to output point to point
Post-processor handle the canned cycle to points conversion process
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Define Working Plane with Heidenhain
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Define Working Plane with Siemens 840D
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Main MCS
Define Main MCS
Customize MCS object, add CS Purpose
Set CS Purpose as “Main”
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Local MCS
Create Local MCS under Main MCS
Customize Local MCS, add CS Purpose and Special Output, Set to Local and None
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MOM_set_csys Event
22© UGS Corp. 2004. All rights reserved.