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STEP-NC Closed Loop Machining

Learn about STEP-NC, an ISO standard for CNC data, and its benefits in improving process control, monitoring, and flexibility in manufacturing. Explore how it interfaces with CAD, CAM, CNC, and PLM systems, defines an object model for working steps, operations, features, and tooling, and enables better process control and monitoring.

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STEP-NC Closed Loop Machining

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  1. STEP-NCClosed Loop Machining Martin Hardwick David Loffredo info@steptools.com STEP-NC Manufacturing Center Watervliet Arsenal, Building 20 Metal Processing Manufacturing Division Watervliet, New York 12189 (518) 687-2848 / (518) 687-4420 fax http://www.steptools.com

  2. STEP-NC AP-238 • What is AP-238? • An ISO Standard for CNC data • Interfaces with CAD, CAM, CNC and PLM systems • How does it operate? • Defines an object model for: • Workingsteps – e.g. WS 1, WS2 etc • Operations – e.g WS1 is Rough milling • Features and tolerances – e.g. Pocket being rough milled • Tooling – e.g. Required attributes for rough pocket milling • Toolpath – e.g. Path, speeds and feeds to mill the pocket

  3. STEP-NC Functionality Benefit Other Models EDM Contouring Inspection Robotics Parametric Operations Feature parameters Probing Workingsteps Feature tolerances Geometric Tolerances Advanced Geometry Operation parameters Program Organization Conditional Operations Path geometry Better Process Control Better Process Monitoring Flexible Manufacturing Functionality

  4. Applications • Smart Process Control • Operator needs to change a speed for all pocketing operations • CNC identifies all pocketing workingsteps that use this feed. • Smart Process Monitoring • Motion control records maximum Z tool tip position for Hole 1 • Customer checks hole feature has required depth. • Smart Manufacturing • CNC measures in-process part • CAM generates modified tool paths

  5. Production testing “4 CAM’s – 2 Controls – 0 Postprocessors” STEP-NC Boeing NIST GDLS P&W Caterpillar GM Lockheed Army BC Table Tilt AB Tool Tilt

  6. “Traditional CNC” Closed-Loop Machining Post Processor Machine Data Converter CAM Process Modification Post Processor Machine Data Converter Machine-Dependent: Non-Portable Machine-Independent: Portable

  7. “Smart CNC” Closed-Loop Machining Machine CAM Process Modification Machine Machine-Dependent: Non-Portable Machine-Independent: Portable

  8. Current Status • Can machine any part • CDS NAS 979 part with a five axis cone • Path geometry, machining functions, technology parameters • Software Dll’s ready for production testing • Stage 1 – replace RS274D but keep same procedures • Stage 2 – optimize procedures using new intelligent data • Implement by • Add STEP-NC export to the CAM • Add STEP-NC converter to control

  9. Conclusion • STEP-NC delivers rich data to the control • The benefits are well known • More accurate machining • Design anywhere, build anywhere • Fewer operational errors • Faster set-up and more flexible manufacturing • The Post was in the way • STEP-NC eliminates the post • Rich data from the CAM into the control and back again • Enabling closed loop machining

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