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Burnishing One Blade Adjustable Reamer
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INTRODUCTION
New machining techniques require
new Tools, which in turn lead to new machining methods.
This constant interaction is the driving force which
ultimately leads to progress. It is this very factor
that leads to continuous development of tools and machine
tools.
Numerical Control of machine tools represents a milestone
in production methods. However, the increase in operating
speed now possible, together with higher precision and
production automation, also places new demands on the
tools.
'Burnishing One Blade Adjustable Reamer' (BOBAR) manufactured
by SUPER SURFACE TOOLS CO., BOMBAY, INDIA, may be a
solution to these new requirements.
Since the beginning of cutting technology for fine machining
of bores, the reaming method has proved indispensable.
One of the main reasons lies in the broad spectrum of
application for which this process can be used - on
all machines with either rotating or stationary tools.
The original HSS multi-blade reamers were replaced by
carbide Tipped blade reamers. Carbide tipped adjustable
floating, pair of blades in a holder (SAMAR & KOYEMANN)
gave fine finish. Now single blade reamers with clamped,
precision adjustable blade and guide pads have put a
step forward.
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The increasing
use of NC-Controlled machines, particularly machining
centres, have brought a further need for tool development
which will allow new methods of increasing performance
to full advantage. This need is now met by BOBAR manufactured
by SUPER SURFACE TOOLS COMPANY, BOMBAY, INDIA.
The cutting process is by means of a precision adjustable,
rigidly clamped blade. Atleast two guide pads placed on
the circumference of the head provide support and guide.
In automatic production, it is vital that the chips removed
do not affect the results. BOBARs have been provided enough
chip clearance space between blade and the two guide pads.
Copious coolant supply will also prevent chips affecting
the results. |
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HIGHLIGHTS
| a) |
Blade with appropriate
cutting edge geometry. The guide pads are positioned to
absorb and utilize the radial and tangential force. Hence,
overall effect is an efficient material removal and size-control
of the bore. |
| b) |
Axial parallelism and
ovality is within 1 to 3 Micron and is maintained over
the entire bore length. Same accuracy is obtained and
broken and interrupted bores with extended guide pads. |
| c) |
Minimum surface irregularity
is achieved by providing 3° finishing lead angle on
blades. |
| d) |
Guide pads while controlling
the cutting edge, burnish the whole surface by exerting
a counter force to the cutting action. |
| e) |
The only wearing part
in 'BOBAR' is the Blade. This blade can be used from the
both sides, Resharpened & Replaced. |
| f) |
The guide pads require
a constant lubricant film for longer life. Any commercial
coolant emulsion (1:9 mixture) serves the purpose. |
| g) |
Stock removal: 'BOBAR'
reams in a straight line and does not follow the pre-machined
bore. For good allround finish, stock removal should be
0.15 mm i.e. 0.3 mm on dia. |
| h) |
Cutting Speed: Standard
speed 12-25 m/min. (Surface speed). Trials with different
RPM, feed and rake angle of the blade should be carried
out for achieving required finish, accuracy and 'production. |
| j) |
The adjustment
is only within the tolerance. The range given is to inform
the Morse-Taper and reaming length available.
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One blade & guide pads positioned
at favourable points.
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Replaceable blade,
clamping
screw and two adjusting
screws. |
Adjusting screw
and
adjusting edge enables
fine adjustment. |
Clamping plate and
clamping screw |
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BOBAR BLADES
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Burnishing One Blade Adjustable Reamer (BOBAR) with
replaceable blades offer fine machining of bores in
deep hole boring process.
The high performance is obtained by precision ground
blade, which is clamped rigidly in the tool body and
provided with fine adjustment.
Cost reduction in BOBAR operation is achieved by providing
it with double ended replaceble blade.
The Diameter of BOBAR is adjustable within a limited
tolarance of about 8 to 10 Micron. Hence it is possible
to set exact tool diameter as per the material being
machined.
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Next
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[ Self Aligning
Machine Adjustable Reamers ] [ Super
Spade Drills ]
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