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The 8th SEMI-DRY CUTTING INTRODUCTION CHAPTER 2Cutting fluid is indispensable,
but if we didn't need to use it,what merits may we find?
This article explains theadvantages provided bysemi-dry cutting in which
only a very small quantityof coolant is used, using
Bluebe's technology as an example.

Role of Cutting Fluid
The most widely believed role of coolant is as
the term itself implies cooling. However, recent
technological advancement has improved tool heat
resistance, and changed the nature of cutting due
to the use of near-net-shape technology whichallows the use of cold forged material with small
stock removal and small heat generation during
cutting. As a result, necessity of cooling becameless important. In addition, higher speed cutting
and faster feed rate are made possible thanks toadvancement of machine tools and cutting tools,
which inevitably increases stock removal amount
per unit time. Accordingly, the major role ofthe coolant has changed from cooling to chip
removal from the point of cutting, and chipflushing away from the table surface and fixtures.

Advantages of Semi-dry Cutting
Machine tools are required to be precise, powersaving and corrosion preventive but the fact thatthe inside of a machine tool is like a shower room
imposes burden to the machine itself. In addition,
circulating large amount of coolant consumes alarge amount of power. Cutting without coolant
can eliminate washing and wiping processes andallows collection of chips of valuable metals
such as copper without drying them. Among theadvantages the semi-dry cutting has, the mostnotable advantage will be it can keep the shop
environment clean to improve workability.

In the aluminum piston
casting factory, chips andscraps can be put into
the re-melting equipment
without drying them.

Paying Attention to Chip Disposal
The studies above draw one key factor for successful
introduction of semi-dry cutting: to use the machinewith good chip disposal. NC lathes in which chips
naturally fall into a chip bucket are examples ofsuch machines. To perform cutting with less heatgeneration on such machines, adoption of semi-dry
cutting is recommended. Since only a small amount of
oil is required, high-performance oil like synthetic
ester can be used, which extends tool life andimproves cutting accuracy. For cutting that requires
cooling due to large heat generation, a coolant mist
system that supplies mist of water-soluble coolant to
the point of cutting is suitable. Moderate cooling
effect can prevent thermal cracking often taking
place with the conventional cooling method.
Oil-bases coolant mist
supply equipment
Bluebe EB7

Bluebe coolant
mist equipment

Generates atomized mist andsupplies it to the tool nose
through the line in the machine.

Generates and sprays mistof water-soluble coolant.

Tools for Mist Coolant "EB-TOOL" (Bluebe)Compared with cutting using conventional coolant
systems, supplying large amount of coolant likea shower, semi-dry cutting is far more delicate.
In semi-dry cutting, invisibly small quantity of
coolant must be positively sprayed onto the toolnose. In the past, a spray nozzle was set very
close to the tool nose requiring tedious setup
procedure. However, appearance of a tool with amist hole, EB-TOOL, made this setup a simple
matter. An EB-TOOL is a turning tool holder withmist supply at the rear end and bottom to spraymist from the spray nozzle to the minor flankand face.

Clean shop floor without
oil spills thanks tosemi-dry cutting. Shop floor
soling is significantly
reduced and workability
is improved.

Bluebe is the product of Fuji BC Engineering Co., Ltd.