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Modeller för styrning av roterande spänndon : skärande bearbetning

Walter, Mats (1993)
Abstract
The chuck has for a long time been considered the weakest link of a lathe. This is mainly due to its twofold connection, to the machine spindle on the one hand and to the work-piece on the other. An additional limitation of the chuck lies in the incomplete knowledge one has of the load it is exposed to during operation, which usually leads to a less than optimal machining process. Unless our understanding of the properties of clamping devices and of the effects of external loads is improved, the risk is great that this deficiency in our knowledge will be a limiting factor in the continuing development of machine tools.<br>

The aim of this thesis has been to isolate and to investigate the factors that influence the machining... (More)
The chuck has for a long time been considered the weakest link of a lathe. This is mainly due to its twofold connection, to the machine spindle on the one hand and to the work-piece on the other. An additional limitation of the chuck lies in the incomplete knowledge one has of the load it is exposed to during operation, which usually leads to a less than optimal machining process. Unless our understanding of the properties of clamping devices and of the effects of external loads is improved, the risk is great that this deficiency in our knowledge will be a limiting factor in the continuing development of machine tools.<br>

The aim of this thesis has been to isolate and to investigate the factors that influence the machining result when using jaw chucks for clamping. An extensive model development has been carried out towards a better understanding of the problem. The models thus developed have been analyzed as to their validity using the FEM and also through extensive experimental studies. The present study has been limited to the processing of ring-shaped, weak work-pieces. This limitation has been introduced because tolerance problems are significant when working on ring-shaped work-pieces and also because rings are well suited to study the influence of other factors. Among these factors, the influence of cutting forces on required clamping-forces and effect of mass forces on the jaws can be mentioned.<br>

The results presented here are intended to form the basis for future adaptive control of the machining process with respect to clamping security.<br>

Subsequent research should focus on an extension of the models presented, a thorough investigation of the conditions of friction and contact-stiffness between jaws and work piece, the development of measuring methods for registration of chuck-stifnesses, the analysis of other work-piece geometries, and finally also study alternative principles for clamping. Hereby a deeper understanding can be gained in the areas discussed in the present thesis in order to improve our knowledge of the influence clamping devices have on productivity. (Less)
Please use this url to cite or link to this publication:
author
opponent
  • unknown], [unknown
publishing date
type
Thesis
publication status
published
subject
pages
184 pages
publisher
Institutionen för mekanisk teknologi och verktygsmaskiner, Lund
defense location
Lund
defense date
1993-01-01 10:15
external identifiers
  • other:CODEN: LUTMDN/(TMMV-1080)/1-184/(1993
language
Swedish
LU publication?
no
id
d50306a6-0741-47f0-884a-e42ad9cea7b4 (old id 1512712)
date added to LUP
2009-12-01 13:00:01
date last changed
2016-09-19 08:45:09
@phdthesis{d50306a6-0741-47f0-884a-e42ad9cea7b4,
  abstract     = {The chuck has for a long time been considered the weakest link of a lathe. This is mainly due to its twofold connection, to the machine spindle on the one hand and to the work-piece on the other. An additional limitation of the chuck lies in the incomplete knowledge one has of the load it is exposed to during operation, which usually leads to a less than optimal machining process. Unless our understanding of the properties of clamping devices and of the effects of external loads is improved, the risk is great that this deficiency in our knowledge will be a limiting factor in the continuing development of machine tools.&lt;br&gt;<br/><br>
The aim of this thesis has been to isolate and to investigate the factors that influence the machining result when using jaw chucks for clamping. An extensive model development has been carried out towards a better understanding of the problem. The models thus developed have been analyzed as to their validity using the FEM and also through extensive experimental studies. The present study has been limited to the processing of ring-shaped, weak work-pieces. This limitation has been introduced because tolerance problems are significant when working on ring-shaped work-pieces and also because rings are well suited to study the influence of other factors. Among these factors, the influence of cutting forces on required clamping-forces and effect of mass forces on the jaws can be mentioned.&lt;br&gt;<br/><br>
The results presented here are intended to form the basis for future adaptive control of the machining process with respect to clamping security.&lt;br&gt;<br/><br>
Subsequent research should focus on an extension of the models presented, a thorough investigation of the conditions of friction and contact-stiffness between jaws and work piece, the development of measuring methods for registration of chuck-stifnesses, the analysis of other work-piece geometries, and finally also study alternative principles for clamping. Hereby a deeper understanding can be gained in the areas discussed in the present thesis in order to improve our knowledge of the influence clamping devices have on productivity.},
  author       = {Walter, Mats},
  language     = {swe},
  pages        = {184},
  publisher    = {Institutionen för mekanisk teknologi och verktygsmaskiner, Lund},
  title        = {Modeller för styrning av roterande spänndon : skärande bearbetning},
  year         = {1993},
}