Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 02222249 1998-02-04
Speci fication
This invention relates to the parting tool used on lathes to separate the
finished product
from the excess material.
It is common on lathes to use a parting tool blade that is clamped into a
solid holder.
which is then clamped onto the tool post. The parting tool blade is adjustable
for
shallow or deep cuts, but once adjusted, the unit is stiff. The problem with
this design is
that the stiffness causes vibration, and as it happens quite often, breaks the
parting tool.
The depth of the cut is also very limited when compared to the width of the
blade, e.g. a
3 mm wide parting tool only allows a 25 mm deep cut.
I have found that these disadvantages may be overcome by using specially
positioned
slots in the holder in order to make it flexible. This flexibility eliminates
the vibration
and dampens any excess pressure applied to the parting tool. This also lets
you extend
the parting tool for a much deeper cut since the blade is much less prone to
breaking.
The holder must be flexible enough to prevent breaking, but must be stiff
enough to cut
the material.
In drawings which illustrate embodiments of the invention. Figure 1 is a top
view of
one embodiment including a parting tool body (body) # I . washers #2, bolts #3
and an
inserted parting tool blade #4 with inserted carbide insert #5, Figure 2 is a
side view of
this embodiment, Figure 3 is a frontal view of this embodiment, Figure 4 is a
top view
of this embodiment without the parting tool blade, washers and bolts, Figure 5
is a
section of the line A-A of Figure 4, Figure 6 is a left side view of this
embodiment
(body # 1 ), Figure 7 is a frontal view of this embodiment (body # I ), Figure
8 is a bottom
view of this embodiment (body # 1 ), Figure 9 is left side view of this
embodiment (body
# 1 ), Figure I 0 is a section of the line B-B of Figure 9, Figure I I is a
rear view of this
embodiment (body # 1 ), Figure 12 is a top view of a component (washer #2) of
this
embodiment, Figure 13 is a side view of this component (washer #2), Figure 14
and I 5
illustrate the claims.
Figures 4 to 11 illustrate different views and sections of the embodiment
(body # I ). It is
constructed out of a single piece and the most important aspect is the unique
shape, as
illustrated by these drawings, which divides it into two main functions
sections. Section
K, shown in Figures 4 and S above the line A-A, is the portion which attaches
to the
tool post of the lathe via a clamping mechanism. Section K also contains a
slot F which
extends upward from the bottom of the unit. Section N in Figure 4 is where two
washers #2, as shown in Figures 1, 2. 3, I 2, and 13, clamp the parting tool
blades to the
unit. There are two counterbore holes which keep the washers #2 in the proper
position.
The washers #2 are then fastened to the unit with two regular socket head
bolts #3.
Sections K and N are connected to each other in only one location, as shown by
the
hatched area in Figure 4. The slot F in section K of Figure 5 is what gives
section N its
flexibility. The height of slot F and the thickness of the material above it
determine the
flexibility.
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