Page 40 - MMI-SeptOct2021 SM upload

Source: Sandvik Coromant

The Coro-
Drill® 863-O
has been mogenous, and the appearance of So, the CVD grade is preferable chined with a 863-O drill with a
designed any new material on a production where hole count is high and cutting diameter (DC) of 6.37 mm
with a focus run presents unique challenges; higher productivity is required. (0.25 inch). Secondly, with a DC of
on industries its own thickness, type of compo- 4.85 mm (0.191 inch).
that make sition and so on. The CD863-O’s In both sets and with all tools,
wide use of Well-equipped robots and
composite superior features are designed to field testing the CD863-O showed excellent
materials tackle any material. The wider CoroDrill 863 family is results. 400 holes were drilled in
and demand Then there is the issue of grade. already benefitting manufactur- the carbon fiber at a DC of 6.37
more feet Carbide drills are well suited to ers’ automated production setups mm (0.25 inch) and 560 holes at
of materi- machining aerospace compo- — both in CNCs and robots on the 4.85 mm (0.191 inch), even still at
al drilled
per tool nents because carbide strength- production line. Because it’s avail- an early stage in their tool life the
— like the ens the tool through the cutting able in carbide, polycrystalline results matched laboratory test-
Aerospace geometry and the shank. This diamond (PCD) and CVD coated ing remarkably well.
industry, optimizes the cutting action and options, the drill can be left to ma- Using Sandvik Coromant’s Ca-
which uses maximizes clearance and materi- chine all kinds of difficult materi- pacity Data Management system,
composite
materials for al evacuation. However, because al types — composites, aluminum, which is a system for predicting
manufactur- of the abrasive nature of compos- titanium, heat resistant super al- and forecasting tool life for our
ing aircraft ites, carbide also wears quickly. loys and stainless steels — in un- customers, we accurately esti-
frames and This is problematic, especially in manned or lights-out processes. mated a safe tool life. Overall, this
other parts. automated production setups. Once out of the laboratory, the demonstrates the product’s capa-
To overcome this, the CD863-O performance of the CD863-O was bilities in providing excellent tool
has Chemical Vapor Deposi- put to the test by drilling holes life, reduced tool changes, and re-
tion (CVD) technology. CVD is into a carbon fiber workpiece. peatable and reliable performance
a very hard tool material that is Carbon fiber is a popular choice of in composite machining. Impor-
ideal for machining composites material in aerospace applications tantly, all of the holes had low lev-
and stacked materials. Applying as engineers look to make lighter els of delamination upon entry, or
CVD layers across the entire cut- aircraft structures, thanks to the exit, throughout both test runs.
ting edge can give much longer material’s superior strength-to- So, it’s clear that dedicated cut-
tool life and, due to CVD’s low weight ratio. ting tools are critical to achieving
coefficient of friction and high A component with an average success in holemaking — espe-
conductivity of heat, the tool’s thickness of 0.25 inches was sub- cially in components made from
cutting edges are less susceptible jected to two sets of drilling with composite or stacked materials.
to built-up edge (BUE). Since CVD a CD863-O geometry, which uses Tools like the CD863-O drill can
remains sharp, this removes heat our own variant of CVD called also play a crucial role in helping
and has low friction and mini- O1AD for improved wear resis- companies fully automate their
mizes the tendency for problems tance in composite materials. processes, even when machining
in holes. First, the workpiece was ma- tough composite materials.

40 | September-October 2021 Modern Manufacturing India