Integrated Machine Tool Simulation & Verification Workshop

Machine Tool ResourcesApril 9-10, 2002

Cypress, California

Machine Tool Builder (MTB)

MTB is a new UG application Creation of the Kinematics Model Based on the Assembly Model Definition of the Kinematics Components in a tree structure Definition of Machine NC Axes, linear

and rotary Definition of Junctions for tool, device

change and for NC axis definition All kinematics components, axes and

junctions can be accessed by the machine

tool driver.

Machine Tool Model

The Assembly Model is created with the standard UG Modeling and Assembly applications.

The Kinematics Model is created with the new Machine Tool Builder application.

The Machine Model is represented by a UG partfile.

KinematicsModel

Machine Tool Model

AssemblyModel

Machine Tool Model – A tree structure of K-Components that define the machine tool geometric and kinematics models.

K-Component – A group of 0 or more assembly components that has kinematics or machining significance.

Junction – A classified coordinate system used for mounting, NC axis definition and reference from MTD driver.

NC Axis - The linear or rotational degree of freedom defined i.r.t one of the predefine junctions.

Objects in Machine Tool Model

Setting Up Machine Tool Resources

Build machine tool model Add new machine tool to library. Define cutting tools assembly (optional) Add cutting tools to library (optional) Add User Defined Events if required. Define machine tool driver.

Build Machine Tool Model – Step by Step

Prepare an assembly model of the machine tool. Define controlled geometry objects as assembly components.

Create new part and add machine tool assembly to it.

Create machine base component as a root of a K-Components tree. Classify K-Components if needed.

Define Machine Zero junction (MTCS).

Define junctions for mounting, NC axis and MTD references.

Define NC axes.

Define empty Workpiece component(s) and classify as such.

Library Managed Machine Model

The machine model partfile is managed by the external machine tool

library (ASCII, GENIUS, IMAN).

The actual partfile name must be identical to <libref>.prt.

For ASCII and GENIUS the environment variable

UGII_CAM_LIBRARY_MACHINE_GRAPHICS_PATH

points to the location of the machine model partfile.

The default setting for ASCII is

$UGII_BASE_DIR\mach\resource\library\machine\graphics

A subdirectory under ...\graphics must exist for every machine and

contain the machine model and all the component partfiles

Library Managed Cutting Tools

Cutting tools can be managed in external library

A partfile with the geometric model of the tool can be added

to the file management of the tool library.

The actual partfile name must be identical to <libref.prt>

For ASCII and GENIUS the environment variable

UGII_CAM_LIBRARY_TOOL_GRAPHICS_PATHpoints to the location of the tool partfile.

The default setting for ASCII is

$UGII_BASE_DIR\mach\resource\library\tool\graphics

Tool Mounting and Tool Tip Information

By default the tool mounting junction is identical to the absolute CSYS of the tool assembly part Use part attributes to specify adapter axis and noraml axis to define a mounting junctionADAPTER_AXIS=(1,0,0)NORMAL_AXIS=(0,0,1) Use part attributes to specify gage offsets CAM_TOOL_ATT_X(1)=-60CAM_TOOL_ATT_Y(1)=-80CAM_TOOL_ATT_Z(1)=0

X

Z

Y

CAM_TOOL_ATT_Z(1)

ADAPTER_AXIS=(0,0,1)

Tool Tip Junction

Tool Mount Junction

CAM_TOOL_ATT_Y(1)

CAM_TOOL_ATT_X(1)

Z

Y

X

ADAPTER_AXIS = (1,0,0)

NORMAL_AXIS = (0,0,1)

Tool Tip Junction

Tool Mount Junction

Tool Mounting (cont.)

During simulation the system automatically creates a Tool Tip

Junction and a Mounting Junction based on Part attributes.

Name of the junctions is SIM_TOOL_TIP, SIM_TOOL_MOUNT

The user can also create those junctions in the tool partfile by

means of MTB. Then part attributes will not be evaluated.

The X-Axis of the tool tip junction defines the rotation axis for

milling/drilling tools.