Course detail

CNC Machining Strategies

FSI-GSCAcad. year: 2024/2025

Programming for the production and evaluation of the quality of the workpieces according to the selected machining strategies:

- workshop-oriented NC programming according to the drawing from CAD (Sinumerik),

- ISO NC programming according to drawings from CAD (with cycles and parametric - Sinumerik, Datron NEXT etc.),

- programming in CAM according to 3D models (Inventor CAD/CAM or SolidWorks CAD/CAM),

- programming of the measuring profile projector via dxf files (SOL 311 / InSpec),

- programming templates for automating the evaluation of surface texture parameters (TH CCI / TalyProfile),

- CMM programming (Eclipse 1000 / Calypso).

The course is designed as a combination of knowledge of the basics of machine tool design, production on CNC machining centers and measurement of workpiece parameters.

The basics of design performed in CAD software are applied to simple examples of workpiece parts. Increased emphasis is placed on the technological design with respect to machining in NC/CAM software. Differences in usable strategies and procedures in machining are evaluated in terms of the integrity of machined surfaces and the overall quality of products.

Language of instruction

Czech

Number of ECTS credits

4

Mode of study

Not applicable.

Guarantor

Ing. Aleš Polzer, Ph.D.

Department

Institute of Production Machines, Systems and Robotics (ÚVSSR)

Entry knowledge

Basics of technical drawing.

Rules for evaluation and completion of the course

A graded credit will be awarded on the basis of the achieved results of independently performed tasks (eg: design, NC programming, measurement) in exercises / laboratories.

The final exam will test theoretical and practical knowledge of the subject matter: in the form of a brief test (5-10 questions) and individual work (30-60 min) in CAD, CAM, CMM or Sinumerik control system of the machine tool.


Student participation in exercises and laboratories is mandatory and checked regularly. Missed exercises / laboratories can be replaced by processing, for example, a brief search on a given topic (details consulted with the teacher in advance). A maximum of four unexcused / unreplaced absences per semester are allowed.

Aims

The main goal of the course is to deepen practical knowledge and experience in controlling selected CAD and CAM software, control system (Sinumerik, Datron Next etc.) CNC machines and specialized contact CMM or optical measuring instruments controlled by their specialized software (eg: CCI optical roughness tester from Taylor Hobson, optical SOL 311 profilometer from Micro-Vu, contact 3D coordinate measuring machine Eclipse 1000 from Zeiss).

 

The graduate's ability to appropriately choose machining strategies on CNC machines with regard to machine design (performance parameters, machine kinematics, etc.) and with regard to the quality of the resulting workpiece (integrity of the machined surface, etc.).

Study aids

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

CNC4you: CNC practical knowledge for production, job shop and production planning. CNC4you [online]. Germany: Siemens, 2022 [cit. 2022-01-03]. Dostupné z: https://new.siemens.com/global/en/markets/machinebuilding/machine-tools/cnc4you.html (EN)
MAREK, Jiří. Konstrukce CNC obráběcích strojů IV.0. Praha: MM publishing, 2018. MM speciál. ISBN 978-80-906310-8-3. (CS)
PETR, Karel. Geometrické tolerance dle ISO GPS. Praha: Verlag Dashöfer, 2019. ISBN 978-80-7635-019-9. (CS)

Recommended reading

Not applicable.

Classification of course in study plans

  • Programme N-VSR-P Master's 1 year of study, summer semester, compulsory-optional

  • Programme C-AKR-P Lifelong learning

    specialization CLS , 1 year of study, summer semester, elective

Type of course unit

 

Laboratory exercise

26 hod., compulsory

Teacher / Lecturer

Ing. Aleš Polzer, Ph.D.

Syllabus

  1. Basic technological calculations of cutting forces, application to a CNC machine tool.
  2. Basic technological calculations of cutting forces, application to a CNC machine tool.
  3. Machining tools.
  4. Determination of cutting conditions for machining.
  5. Cutting forces, machinability and deformation of workpieces.
  6. Programming the machining/measurement of a specific part. (SW: Inventor, Sinumerik, InSpec, Calypso)
  7. Programming the machining/measurement of a specific part. (SW: Inventor, Sinumerik, InSpec, Calypso)
  8. Programming the machining/measurement of a specific part. (SW: Inventor, Sinumerik, InSpec, Calypso)
  9. Programming the machining/measurement of a specific part. (SW: Inventor, Sinumerik, InSpec, Calypso)
  10. Programming the machining/measurement of a specific part. (SW: Inventor, Sinumerik, InSpec, Calypso)
  11. Workpiece surface integrity. (Surftronic / TalyProfile)
  12. Workpiece surface integrity. (TH CCI / TalyProfile)
  13. Machining/measuring demonstration. 

Exercise

26 hod., compulsory

Teacher / Lecturer

Ing. Aleš Polzer, Ph.D.

Syllabus

  1. Distribution of machined and cutting materials, machinability, workpiece quality and its measurability (ISO GPS matrix).
  2. Cutting forces for individual chip machining operations, their analytical calculation, the flow of forces through the machine tool and the effect of the force action of the cutting tool on the quality of the workpieces.
  3. Ways of clamping tools and workpieces on CNC machine tools, principles and influence on the loading of machines / workpieces.
  4. The occurrence of self-excited oscillation during machining, technological methods of limiting its occurrence.
  5. Production strategy when machining non-rotating workpieces on milling machining centers with a vertical spindle axis.
  6. Machining strategies for machining non-rotating workpieces on milling machining centers with a horizontal spindle axis.
  7. Machining strategies for machining non-rotating workpieces on portal machining centers.
  8. Machining strategies for machining workpieces on milling multifunctional machining centers.
  9. Machining strategies for machining rotary workpieces on turning centers with horizontal and vertical spindle axis.
  10. Machining strategies for machining rotary workpieces on multifunctional turning machining centers.
  11. Machining strategies on horizontal boring machines.
  12. Machining strategies on grinding machines.
  13. Heavy workpiece machining/measuring strategy.