Foto del docente

Dario Croccolo

Full Professor

Department of Industrial Engineering

Academic discipline: ING-IND/14 Mechanical Design and Machine Construction

Head of Interdepartmental Centre for Industrial Research in Advanced Mechanical Engineering Applications and Materials Technology

Teaching

Dissertation topics suggested by the teacher.

Important company in the Automotive sector is looking for profiles of undergraduates and master's degree graduates on LCA vehicle. For further information contact me via email.

Attitude to self-loosening of screws due to vibrations

Define guidelines to avoid/reduce vibration related to loosening

Mainly EXPERIMENTAL activity

- identify an experimental test to evaluate the aptitude to the self-loosening

- evaluate the influence of untightening for:

1 geometry of the connection (screw length, screw stiffness, type of washer ...)

3 different preload levels with the same geometry

3 possible screw coatings (lubrication, phosphating, ...)

- identify possible countermeasures and define improvements


Head cover tightening

EXPERIMENTAL part 

- Identify the best torque + angle tightening strategy to minimize tightening dispersion

- Measurement of the experimental pre-load:

1 Direct measurement with strain gauges

2 Indirect measurement using the stiffness / elongation relationship

3 Validation of the indirect measure

NUMERICAL part:

- how to define the stiffness of the connection (screw and plates) numerically

- define a numerical / analytical model for estimating the initial load knowing experimental frictions


Timing cover tightening

Define better tightening strategy to minimize assembly dispersion on a large timing cover

- influence of the pattern / tightening order on the residual torques

- influence of the sealing paste on the tightening

- identify the best tightening pattern (cross, clockwise, second closing turn, ..)

 

Proactive approach to process checks on tightening

Work program and macro issues to be addressed:

1. Knowledge and in-depth study of the tightening strategies used on production cars

2. Benchmark and comparison on technical solutions of bolted joints both in terms of product and in terms of process

3. Deepening of the D - FMEA and examples of reverse engineering on tightening

4. Proposals for improvement and feasibility study on technical solutions on tightening both in terms of product and in terms of process

Theses with internship in collaboration with important companies in the Automotive sector located near Modena

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