STEP-NC for Milling and RP in Korea Presentation - ISO...STEP-NC for Milling and RP in Korea ERC-ACI...

STEP-NC for Milling and RP in Korea

ERC-ACI

Wonsuk Lee, Youngbobg Bang, Jacob Jee and Wook Hyun Kwon

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Contents

� Roles of Korean Region� ISO 14649 (STEP-NC)� Structure of STEP-NC in Korea

� Implementation of STEP-NC for milling � STEP-NC System for milling� Test of STEP-NC for milling

� Design and Development of STEP-NC for RP� Research Objectives� User Requirements� Data Model and Implementation

� Conclusions

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Roles of Korean Region

� Implementation of STEP-NC for milling

� Design and Development of STEP-NC for Rapid Prototyping Data Model

� Design and Development of STEP-NC Turning Data Model


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ISO 14649 : STEP-NC

� Composed of entity and attributes� Each entity has supertype and

subtype� The meaning of each attribute is

written in ISO14649 documents

Entity

Machining workingstep

Its id

Its secplane

Its feature

Its operation

Data typeString

Attributes of Entity

Data typeEntities

Machining workingstep

Touch probing

Rapid movementWorkingstep

Supertype Subtype


Data Structure of ISO14649

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ISO 14649 : STEP-NC

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� Writing data in EXPRESS format� Same form as C function� Each entity to function name,� Each attribute to variables of function� To analyze e-files, schema in ISO14649 is necessary


ISO14649 in e-file

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ISO 14649 : STEP-NC� Hard to recognize data structure

� Make tree structure by linking each line numbers� Do not have the sequential structure

� Hard to use and check attributes� No description of attributes in EXPRESS files� Necessity of Schema in ISO14649 documents

� Hard to use EXPRESS files in PC language� Necessity of development of new parsers for PC languages

Using XML


Weak point of Express

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Structure of STEP-NC in Korea

� Extensible Markup Language (XML)� Meta language – language to make e-document� Standard for exchange data in WEB environment� Structured data

� Easy to access and use data in XML file� Increase of file size


Why is XML

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� One element is composed of a tag, a comment and texts

� In the every end of element, </tag> is inserted to mark the end of one element

� Tree-structure is made by including child elements by the mother element

<Tag1 Comment1>

</Tag1>

<Tag2 Comment2>

</Tag2>

Text1

Text2


Structure of XML

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� E-file which is easier to understand that EXPRESS file� Supporting tree-structure in itself

� Writing e-document that has almost same structure as schema of ISO14649

� Writing document sequentially that is different from EXPRESS� Containing matter of ISO14649 documents in e-file in XML

� Tag -> attribute name� Comment -> entity name or value name of attribute� Text -> value of attribute


Why XML (1)

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� Most widely used and researched meta language� ebXML� Strong support of Microsoft

� Advantage to make software solutions� Many parsers for various OS and PC-language� Many applications and samples for for using XML� Many researches for development and application


Why XML (2)

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- <main_workplan name="WORKPLAN" id="#2"><its_id name="identifier">’MAIN WORKPLAN’</its_id> + <its_elements name="MACHINING_WORKINGSTEP" id="#10">

</its_elements>+ <its_elements name="MACHINING_WORKINGSTEP" id="#12">



</its_elements><its_channel name="channel" /> + <its_setup name="SETUP" id="#8">

</its_setup><its_effect name="in_process_geometry" />

</main_workplan>

Entity name EXPRESS line number

Attribute name


ISO14649 in XML

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STEP-NC System for Milling

CNC

ControllerController

S F PS F P

STEP-NCfile

XML file

XML Converter

STEP-NC Interpreter

Communication

Module

MachiningData

Tool Path

Tool pathGenerator

CommunicationModule

Status

Command

Status

Error List

TCP / IP

Motion Control

Signal

II

I

Implementation for Milling

STEP-NC milling

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STEPSTEP--NC Interpreter NC Interpreter

XMLProcesso

r

MainProcesso

r

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XML file

Motion ControlBoard

Tool PathGenerator

Error report


SFP

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PC

PCI-7212cMotor controller

Step motor driver

Step motor driver

Step motor driver Step motor

Step motor

Step motor

Tool path-Pulse-Frequency

Board statusBuffer status

•Tool path generation

•Buffer status monitoring

•Board status monitoring


Local Controller

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SFP system

Windows socket(Client)

Windows socket(Server)

PC-NC system( Turbo-tek )

TCP/IP moduleCommunicate between SFP and PC-based CNCTransmit tool-path and machine status

Tool pathSTEP-NC data

Machiningcommands


Remote controller With TCP/IP module

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Test of STEP-NC for milling

� SFP system test� Test using ready-made STEP-NC file� Machining by milling machine of local controller� Using the example 1 of ISO14649-11 document

� Test for applying of ISO14649 to machining� Storing every data of production to XML file by using

ISO14649 schema� Using a two5D geometry that is made of NURBS boundaries

and has two islands

� Remote controller test� Testing information transfer by TCP/IP� Machining simulation by TURBO-TEK controller


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� STEP-NC file including full information� Example 1 of ISO14649-11 F-dis version

� 5 workingsteps

� 3 two5D features

X

YZ

F1

F2

F3

x

y

z

P1

P2

P3

P4

R10

100120

50

Drill Holeø 22 Depth 30

20

25

50

30

80R1

30


1st case – SFP system

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� STEP-NC file including only geometry information� STEP-NC file directly made with only STEP file� 1 two5D feature including 2 bosses(islands)� Workingsteps and features for operations are generated by

SFP


2nd case – Integrated system

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� Sending data to remote controller by TCP/IP communication module� Performing machining simulation� Sending ISO14649 data� Sending tool path list

in the form of G-code


3rd case – Remote controller

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Design and Development of STEP-NC for RP

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Research Objectives

� Development of a data interface for “Rapid Prototyping” which are not yet part of ISO 14649 (for non-milling).� User requirements (Task 4.6)� Data model (Task 5.6)� Implementation (Task 6.6)

Design STEP-NC for RP

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User requirements

� Collection of user requirements which are specific to RP� The most appropriate treatment of component and assemblies� Process independent information generally applicable to all

processes.� Possibility of inhomogeneous/ non-isotropic material

distribution modeling


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User requirements

� 106 RP machines in Korea (2000)� 24 SLA (22.6%)� 16 FDM Genisys (15.1%)� 13 SLS (12.3%)� 12 FDM Quantum (11.3%)� 12 SPI (11.3%)� 11 Z-402 (10.4%)� 7 Thermojet (6.6%)� 7 LOM (6.6%)� 3 Kira (2.8%)� 1 SGC (0.9%)


Recent Report of RP

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User requirements

Information needed forordering RP services

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Order of RP Services

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User requirements

Information neededfor slicing

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Tolerance 41%


Information needed for Slicing

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User requirements

Information needed for executing RP process

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Information needed for process

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User requirements

Need to store/retrieve2D sliced layers?��

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Work preferences of STL files

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User requirements

Importedfile format

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Imported File Format

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User requirements

Part layout

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Decide part Orientation

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Data model and Implementation

� Devise functional data model supporting:� Information users� Information suppliers� Process/time & cost history


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Service consultant

CAD designerRP manufacturer

Heterogeneous user/supplier environment


Work Environments

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CAD designers

data model(STEP-NC for RP)

translator

Consulting

Service consultant

translatorCAD system translator preprocessor

manufacturers

RP machine


Work Configuration

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Model Configuration

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� Benefits of functional data model� Easy access, retrieval, and treatment of model data� Interactive information exchange in heterogeneous user/

supplier environment



Benefits of functional data model

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CAD designer RP manufacturer

machine_spec

Interfacecategory

User/Supplier

Service consultant

Design

categoryManufacturing

category


Applications of Data Model

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Organization of the data model classes for an application

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Manufacturing category

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Interface category

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Interface category


Configurations of Data Model

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Data model and Implementation� Data model case study for RP (43minutes $144 Z-402)

� Layer thickness� Tolerance/Surface finish

� Part location/orientation/quantity� Machine type


Part Example

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� Machine type: Object Quadra

5h 43min $518

(21,935mm3)

2h 52min $246

(17,729mm3)

2h 4min $179

(17,664mm3)

5h 31min $507

(70,953mm3)

6h 55min $573

2h 30min $210

2h 14min $188

4h 51min $425


Test Method

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Test Method

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Conclusions (for Milling)

� ISO14649� New commands for machine tools� Integrated database for entire production chain

� ISO14649 in XML form� Applying XML which is more widely used e-document standard to

ISO14649

� STEP-NC milling � Processing XML files� Generating tool paths and performing automatic machining� Remote controller with TCP/IP communication module and local

controller with step motors

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Conclusions (for RP)

� User requirements� Cooperative survey with other regions

� Data model� Refinement of functional data model

� Implementation� Construct test components (suites, method, tool)� Execute conformance testing

STEP-NC for Milling and RP in Korea Presentation - ISO...STEP-NC for Milling and RP in Korea ERC-ACI...

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