STMT at RWTH Aachen

Flashcards and summaries for STMT at the RWTH Aachen

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Study with flashcards and summaries for the course STMT at the RWTH Aachen

Exemplary flashcards for STMT at the RWTH Aachen on StudySmarter:

What is suitable material for a piezoelectric sensor?

Exemplary flashcards for STMT at the RWTH Aachen on StudySmarter:

What are advantages of a strain gauge?

Exemplary flashcards for STMT at the RWTH Aachen on StudySmarter:

What are disadvantages of a strain gauge?

Exemplary flashcards for STMT at the RWTH Aachen on StudySmarter:

Which are relevant process quantities which can be measured during a cutting process to validate a cutting simulation in the end?

Exemplary flashcards for STMT at the RWTH Aachen on StudySmarter:

How is the lack of material properties getting  compensated?

Exemplary flashcards for STMT at the RWTH Aachen on StudySmarter:

What are typical characteristics of a grinding process when it comes to cutting speed, temperatures and froming speeds and how do they influence the grinding simualtions?

Exemplary flashcards for STMT at the RWTH Aachen on StudySmarter:

What's the difference between profiling and sharpening (part of dressing)?

Exemplary flashcards for STMT at the RWTH Aachen on StudySmarter:

What are typical steps in the procedure of measuring values with sensors?

Exemplary flashcards for STMT at the RWTH Aachen on StudySmarter:

What is typical for grinding compared to cutting, when it comes to cutting edges?

Exemplary flashcards for STMT at the RWTH Aachen on StudySmarter:

Which empirical tool wear models are exisiting?

Exemplary flashcards for STMT at the RWTH Aachen on StudySmarter:

Which wear mechanisms are influencing the tool cutting edge during sliding?


Exemplary flashcards for STMT at the RWTH Aachen on StudySmarter:

Which material damage mechanisms are occuring during cutting? And which are the fitting models?

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Exemplary flashcards for STMT at the RWTH Aachen on StudySmarter:

STMT

What is suitable material for a piezoelectric sensor?

Quartz

Tourmaline

Ferroelectric Ceramics

STMT

What are advantages of a strain gauge?

  • Universally and easily applicable
  • Small / Low Mass
  • Wide Frequency Range (0… > 50kHz)
  • High stability over a long usage
  • Low Cost
  • ….

STMT

What are disadvantages of a strain gauge?

  • Relative change in resistance is very low (electrical bridge circuit is always used)
  • Temperature Limits
  • Can not be reused
  • Precautions (Humidity, Temperatures, magnetic Field)

STMT

Which are relevant process quantities which can be measured during a cutting process to validate a cutting simulation in the end?

  • Force
  • Torque
  • Active Power
  • Temperature
  • Acceleration
  • Mechanical Vibration (AE)

STMT

How is the lack of material properties getting  compensated?

extrapolation of strain rate, because it is hard to measure it with experiments (very high speed necessary); afterwards is a validation necessary

STMT

What are typical characteristics of a grinding process when it comes to cutting speed, temperatures and froming speeds and how do they influence the grinding simualtions?

Cutting speeds:
vc ≈ 15 – 200 m/s

Temperatures:
peaks above 1200°C

Temperature gradients:
10^6 °C/s / 10^3 °C/mm

Forming speeds:
phi_dot ≈ up to 10^7 1/s

-> Many material properties are not known within these ranges

STMT

What's the difference between profiling and sharpening (part of dressing)?

Profiling – generate the geometry of the grinding wheel

Sharpening – removing the bond of the grinding wheel to set the grinding grains free

STMT

What are typical steps in the procedure of measuring values with sensors?

  • Sensor selection & application
  • Measuring signal & processing
  • Process related signals

STMT

What is typical for grinding compared to cutting, when it comes to cutting edges?

In grinding, we have …

  • 10^3 to 10^4 times more cutting edges (smaller chips)
  • geometrically undefined cutting edges (different chip formation processes)
  • statistic distribution of the cutting edges (different chip thicknesses)
  • cutting edges which do not all have the same distance from the rotation axes (different chip thicknesses)
  • cutting edges which do not come into contact with the workpiece (static, kinematic cutting edges)

STMT

Which empirical tool wear models are exisiting?

Archard (Adhesion/ Abrasion)

Usui (Adhesion)

Takeyama (Abrasion/ Diffusion)

STMT

Which wear mechanisms are influencing the tool cutting edge during sliding?


  • Abrasion
  • Adhesion
  • Delamination

STMT

Which material damage mechanisms are occuring during cutting? And which are the fitting models?

  • Shear loading – Shear localisation model (Imperfection theory)
  • Tensile loading – Void growth model (Hancock-Mackenzie)

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Qualitätsmerkmale -- Planen, Realisieren, Erfassen

Industrielle Montagesysteme

Anlaufmanagement in produzierenden Unternehmen

Industrielle Montagesysteme

Herstellung elektrischer Energiespeicher

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