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Analys av vävmaskin

Nilsson, Tomas (2006) MMK820
Product Development
Abstract
Texo AB is a private company which is specialized on development of looms for
production of paper machine clothing. The company is located to Älmhult in southern
Sweden and today employs about 90 persons.
The calculation job treats 4 independent tasks, of which 3 is dealing with the same
type of machine which is almost at the prototype state at the moment.
The new machine TC 74 is a cam controlled loom with up to 15 meters weaving
width and is supplied by two AC motors which are able to be speed controlled by
changing the power frequency. The machine speed of today is up to 100 shots/min.
The main task of this thesis was to decide the power needed to drive the new loom.
The design on the parts of the loom are almost finished and... (More)
Texo AB is a private company which is specialized on development of looms for
production of paper machine clothing. The company is located to Älmhult in southern
Sweden and today employs about 90 persons.
The calculation job treats 4 independent tasks, of which 3 is dealing with the same
type of machine which is almost at the prototype state at the moment.
The new machine TC 74 is a cam controlled loom with up to 15 meters weaving
width and is supplied by two AC motors which are able to be speed controlled by
changing the power frequency. The machine speed of today is up to 100 shots/min.
The main task of this thesis was to decide the power needed to drive the new loom.
The design on the parts of the loom are almost finished and are therefore available for
use in the power calculation. It is however truly that details and minor changes must
be done further on when the first prototype is under construction. Therefore, it is
expressed from the design department of the company, that the power analysis of the
new loom is carried out as an Excel file where it is possible to adjust different
parameters and directly see how these effect the power needed.
Since the new loom is cam controlled, it´s cam profiles have to be dimensioned
against the contact pressure that occures between cam and roll follower. When this
maximal pressure has been calculated for all cams, material, hardening depths
required and way of hardening can be decided. To verify the theoretical calculated
values of contact pressure and shape of contact zone, a finite element analysis is
performed.
The next construction to analyse is a 23,3 meter long warp beam. This beam is
located to the intake side of the loom and consists of a number of joint pipe modules.
The task of the warp beam is to carry up and brake the bobines which the warp is
reeled upon. To keep the warp in correct tension during the reeling of from the
bobines, the beam must be braked with a moment at one of the ends. Shorter beams
has earlier been constructed with the same pipe modules as now thought to be used,
but never 23,3 meters long. Therefore it is now suitable that the structural behavior of
the warp beam is analysed. This is of great importance especially when the beam is
extra loaded at the time for bobine exchange.
The last machine component being analysed is a broken excenter shaft that fractured
after a short time operating. This shaft is a part of Texo HiLo which itself is mounted
on a looms to compensate for different shed geometries. The excenter shaft is
exposed by both torsion and a great radial load which has been decided according to
Texo. To prescribe the design change which has to be done, a careful analysis with
both elementary cases and finite elements is performed on the shaft. Theese two
analysis are pointing in the same direction, the material stress of the excenter shaft is
far higher than what can be accepted for a component excerting dynamical load. (Less)
Please use this url to cite or link to this publication:
author
Nilsson, Tomas
supervisor
organization
course
MMK820
year
type
H2 - Master's Degree (Two Years)
subject
language
Swedish
id
1510899
date added to LUP
2009-11-25 15:40:32
date last changed
2010-02-01 14:40:06
@misc{1510899,
  abstract     = {Texo AB is a private company which is specialized on development of looms for
production of paper machine clothing. The company is located to Älmhult in southern
Sweden and today employs about 90 persons.
The calculation job treats 4 independent tasks, of which 3 is dealing with the same
type of machine which is almost at the prototype state at the moment.
The new machine TC 74 is a cam controlled loom with up to 15 meters weaving
width and is supplied by two AC motors which are able to be speed controlled by
changing the power frequency. The machine speed of today is up to 100 shots/min.
The main task of this thesis was to decide the power needed to drive the new loom.
The design on the parts of the loom are almost finished and are therefore available for
use in the power calculation. It is however truly that details and minor changes must
be done further on when the first prototype is under construction. Therefore, it is
expressed from the design department of the company, that the power analysis of the
new loom is carried out as an Excel file where it is possible to adjust different
parameters and directly see how these effect the power needed.
Since the new loom is cam controlled, it´s cam profiles have to be dimensioned
against the contact pressure that occures between cam and roll follower. When this
maximal pressure has been calculated for all cams, material, hardening depths
required and way of hardening can be decided. To verify the theoretical calculated
values of contact pressure and shape of contact zone, a finite element analysis is
performed.
The next construction to analyse is a 23,3 meter long warp beam. This beam is
located to the intake side of the loom and consists of a number of joint pipe modules.
The task of the warp beam is to carry up and brake the bobines which the warp is
reeled upon. To keep the warp in correct tension during the reeling of from the
bobines, the beam must be braked with a moment at one of the ends. Shorter beams
has earlier been constructed with the same pipe modules as now thought to be used,
but never 23,3 meters long. Therefore it is now suitable that the structural behavior of
the warp beam is analysed. This is of great importance especially when the beam is
extra loaded at the time for bobine exchange.
The last machine component being analysed is a broken excenter shaft that fractured
after a short time operating. This shaft is a part of Texo HiLo which itself is mounted
on a looms to compensate for different shed geometries. The excenter shaft is
exposed by both torsion and a great radial load which has been decided according to
Texo. To prescribe the design change which has to be done, a careful analysis with
both elementary cases and finite elements is performed on the shaft. Theese two
analysis are pointing in the same direction, the material stress of the excenter shaft is
far higher than what can be accepted for a component excerting dynamical load.},
  author       = {Nilsson, Tomas},
  language     = {swe},
  note         = {Student Paper},
  title        = {Analys av vävmaskin},
  year         = {2006},
}