Advanced

Variable timing of cutting rollers

Vestermark, Christer LU (2015) In Examensarbete MME820 20151
Machine Elements
Abstract
In this thesis a mechanical concept for variable relative rotation, here called timing, between two cutting rollers has been designed. This concept has then been compared to a concept using one servo motor per shaft.
The clients would like to use rotary cutters to cut cardboard, but have had problems with the anvil wearing out on similar solutions. Therefore a solution where the timing between the rollers could be varied a few degrees and thereby spread the wear on the anvil, was desired.
Different concepts and functional principles for variable timing were investigated during the product development process. Of the mechanical alternatives, a concept using axial displacement of a helical gear to achieve the timing adjustment was chosen.
... (More)
In this thesis a mechanical concept for variable relative rotation, here called timing, between two cutting rollers has been designed. This concept has then been compared to a concept using one servo motor per shaft.
The clients would like to use rotary cutters to cut cardboard, but have had problems with the anvil wearing out on similar solutions. Therefore a solution where the timing between the rollers could be varied a few degrees and thereby spread the wear on the anvil, was desired.
Different concepts and functional principles for variable timing were investigated during the product development process. Of the mechanical alternatives, a concept using axial displacement of a helical gear to achieve the timing adjustment was chosen.
The mechanical concept was compared to the dual servo solution with respect to cost, energy consumption and other criteria that were desired for the machine. With a slightly higher investment cost, but lower energy consumption and better fulfilment of the other criteria, it was found that a dual servo solution would be the better choice in this case.
A problem that arose during the project was that the rollers were to be pressed together with a high force and the timing could therefore not be adjusted straight away. To solve this, a concept using a combination of a cam and a roller bearing wheel is proposed. There is however some concerns regarding this solution and as it was primarily developed for the helical gear concept. Therefore it should be revised before usage with a dual servo solution. (Less)
Please use this url to cite or link to this publication:
author
Vestermark, Christer LU
supervisor
organization
course
MME820 20151
year
type
H2 - Master's Degree (Two Years)
subject
publication/series
Examensarbete
report number
ISRN: LUTMDN/TMME—5006—SE
ISSN
ISRN
language
English
id
7374354
date added to LUP
2015-06-24 09:21:46
date last changed
2015-06-24 09:21:46
@misc{7374354,
  abstract     = {In this thesis a mechanical concept for variable relative rotation, here called timing, between two cutting rollers has been designed. This concept has then been compared to a concept using one servo motor per shaft.
The clients would like to use rotary cutters to cut cardboard, but have had problems with the anvil wearing out on similar solutions. Therefore a solution where the timing between the rollers could be varied a few degrees and thereby spread the wear on the anvil, was desired.
Different concepts and functional principles for variable timing were investigated during the product development process. Of the mechanical alternatives, a concept using axial displacement of a helical gear to achieve the timing adjustment was chosen.
The mechanical concept was compared to the dual servo solution with respect to cost, energy consumption and other criteria that were desired for the machine. With a slightly higher investment cost, but lower energy consumption and better fulfilment of the other criteria, it was found that a dual servo solution would be the better choice in this case.
A problem that arose during the project was that the rollers were to be pressed together with a high force and the timing could therefore not be adjusted straight away. To solve this, a concept using a combination of a cam and a roller bearing wheel is proposed. There is however some concerns regarding this solution and as it was primarily developed for the helical gear concept. Therefore it should be revised before usage with a dual servo solution.},
  author       = {Vestermark, Christer},
  issn         = {ISRN},
  language     = {eng},
  note         = {Student Paper},
  series       = {Examensarbete},
  title        = {Variable timing of cutting rollers},
  year         = {2015},
}