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Pin Project Part II

Strömberg, Carl-Johan and Johansson, Anders (2009) MMK820
Product Development
Abstract
The main purpose of the project has been to find the root cause to the failure of a machine component used to secure some vital parts (later on referred to as the pins) of a packing machine. It was already known that the failure had to do with fatigue, but the actual mechanisms were quite unknown. Measurements on the components did not indicate forces that should lead to failure.
The components of interest are mainly a filling pipe with an attached flange. The flange is secured to the pipe with two pins. The package is then formed around the flange, filled, formed to its final shape and finally sealed and cut off. Whenever the second forming stage takes place forming flaps are folded up, thus producing a mass movement within the fluid.... (More)
The main purpose of the project has been to find the root cause to the failure of a machine component used to secure some vital parts (later on referred to as the pins) of a packing machine. It was already known that the failure had to do with fatigue, but the actual mechanisms were quite unknown. Measurements on the components did not indicate forces that should lead to failure.
The components of interest are mainly a filling pipe with an attached flange. The flange is secured to the pipe with two pins. The package is then formed around the flange, filled, formed to its final shape and finally sealed and cut off. Whenever the second forming stage takes place forming flaps are folded up, thus producing a mass movement within the fluid. This energy is transferred to the flange and of course the pins.
The work was carried out in mainly three steps. First an investigation and compilation of known facts was done. The most significant result of this was the visible large wears and deformations on the used pins. Thereafter some brainstorming led to the development of a theory, or chain of events, that could lead to failure. The last step was to verify the theory with simulations with the help of FEM software. These simulations gave at hand that even a very small gap in the contact between the components could give rise to significant large stresses in the material, leading to a failure of the components.
The failure mechanism is depending upon the fact that all existing designs give rise of forces when in contact with the lower filling pipe, thus stressing the pins. Therefore an alternative pin design, eliminating this phenomenon, is presented as a replacement. The report also includes a CFD-analysis in order to get a better understanding of the forces acting on the flange during a normal machine cycle. The results from other FEM-analysis showed that dangerously high stresses arise already at small deformations with forces that are transferred from the fluid. (Less)
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author
Strömberg, Carl-Johan and Johansson, Anders
supervisor
organization
course
MMK820
year
type
H2 - Master's Degree (Two Years)
subject
keywords
fatigue, failure, pin, AISI 316L, filling machine, flange, FEM, root cause, mechanism, packaging system
language
English
id
1544519
date added to LUP
2010-02-11 15:20:32
date last changed
2010-02-11 15:20:32
@misc{1544519,
  abstract     = {The main purpose of the project has been to find the root cause to the failure of a machine component used to secure some vital parts (later on referred to as the pins) of a packing machine. It was already known that the failure had to do with fatigue, but the actual mechanisms were quite unknown. Measurements on the components did not indicate forces that should lead to failure.
The components of interest are mainly a filling pipe with an attached flange. The flange is secured to the pipe with two pins. The package is then formed around the flange, filled, formed to its final shape and finally sealed and cut off. Whenever the second forming stage takes place forming flaps are folded up, thus producing a mass movement within the fluid. This energy is transferred to the flange and of course the pins.
The work was carried out in mainly three steps. First an investigation and compilation of known facts was done. The most significant result of this was the visible large wears and deformations on the used pins. Thereafter some brainstorming led to the development of a theory, or chain of events, that could lead to failure. The last step was to verify the theory with simulations with the help of FEM software. These simulations gave at hand that even a very small gap in the contact between the components could give rise to significant large stresses in the material, leading to a failure of the components.
The failure mechanism is depending upon the fact that all existing designs give rise of forces when in contact with the lower filling pipe, thus stressing the pins. Therefore an alternative pin design, eliminating this phenomenon, is presented as a replacement. The report also includes a CFD-analysis in order to get a better understanding of the forces acting on the flange during a normal machine cycle. The results from other FEM-analysis showed that dangerously high stresses arise already at small deformations with forces that are transferred from the fluid.},
  author       = {Strömberg, Carl-Johan and Johansson, Anders},
  keyword      = {fatigue,failure,pin,AISI 316L,filling machine,flange,FEM,root cause,mechanism,packaging system},
  language     = {eng},
  note         = {Student Paper},
  title        = {Pin Project Part II},
  year         = {2009},
}