Thesis-2004-Hynek.pdf (5.98 MB)
Wood surface form improvement by real time displacement of tool trajectory
thesis
posted on 2014-02-04, 14:08 authored by Pavel HynekPlaning and moulding operations carried out within the woodworking industry make an
extensive use of rotary machining. Cuttermarks are produced on the timber surface,
which are generally accepted as unavoidable. More noticeable surface defects may be
produced by such factors as cutterhead imbalance, and until recently most research has
concentrated on removing these defects. When a high quality finish is required, a further
machining operation, such as sanding, is often required to remove cuttermarks. What is
required is a modified machining process, which combines a surface closer to the ideal
fixed knife finish, while retaining the flexibility, practicality and cost effectiveness of
rotary machining.
It has been theorized that the surface finish of planed and moulded timber products may
be improved by introducing vertical cutterhead pulses. This thesis concerns the progress
made towards the modification of the rotary machining process to improve surface form
for planed timber components. Thus simulation of the rotary machining process is
described, allowing an evaluation of the surface form quality produced by the modified
machining process, and allowing a comparison to be made between the effectiveness of
new machining process and conventional rotary machining.
In order to verify the effectiveness of the proposed machining method, a small-scale
planer with an actuation system using piezoelectric actuators to control the spindle
movement was designed. An electrical model of the piezoelectric actuators was
combined with a finite element model of the spindle to create an overall model used for
simulation. The modelling technique used represents significant progress in the field of
mechatronic system modelling, and a useful tool for designing active spindle systems.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Publisher
© Pavel HynekPublication date
2004Notes
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.Language
- en