NEW PRODUCTHigh Cleanliness Coolant System
JTEKT has developed a high cleanliness coolant
system that dramatically improves the cleanliness ofcoolant used within grinders. The development of thissystem was achieved through a secondary filtering unit
using a magnet separator with high magnetic force anda cyclone with high collecting ability. A tertiary filtering
unit was necessary to obtain the same level of cleanlinessof 5 ppm as the conventional system. Additionally,
the filtering unit employs adsorption using magneticforce as well as a centrifugal separation system. Thiseliminates the need for periodic filter replacement due
to performance degradation, reduces running cost, andlessens the environmental burden.
Grinding with high cleanliness coolant improves
roundness and surface quality by reducing scratches.

(1) Coolant system with 5 ppm cleanliness throughsecondary filtering(2) Simple structure that saves 52% more space(3) Maintenance-free structure enabling lower runningcost

2. Filtering performance/cleanliness
2. 1
The two newly developed types of filtering units enable
the collection of fine chips and abrasive grains. The
performance of these units exceeds 90% in capturing finechips with a particle diameter of u5 μm or greater.

Collection rate, %100
CCX series,
secondaryfiltering
cyclone8070MX series,
primary filtering
magnet separator

0123456789 10 11 12

Operation period, months

Transition in cleanliness3. Structure

MF series,
conventional
product

60
50

87654
32
103. 1The structure is a simple secondary filtering systemwith a compact appearance.

5 µm/90% collection

902. 2The system is able to maintain cleanliness of 5 ppm
over long periods without the need for maintenance.
Cleanliness, ppm

1. Features

Newly developed
Secondary filtering
cyclone filter
Newly developed

0510 2050 100 200 300 400 500

Particle diameter, µm

Primary filtering
magnet separator

Filtering performance

Coolant unit

JTEKT CORPORATIONJTEKT ENGINEERING JOURNAL English Edition No. 1012E (2015)107

GrinderSecondary filtering
cyclone filter

Temperature
regulator for coolant

Primary filtering
magnetseparator

Pump

Pump

Pump

0.50Current product◆ The high level of cleanliness prevents coolant decayand lengthens the period between each coolantreplacement

Main tank

Coolant replacement frequency, ratio

4. Results
4. 1 Improved accuracy◆ Resolves roundness defects by preventing chipbiting
Example: Bearing component outer diameter grinding
Conventional productNew product

Dressing frequency

Filtration flow

Roundness, index

11

1.5

Example: Tri-port outer diameter grinding/
rack shaft outer diameter grinding

544

Good

Recovery tank

32

1

10

Current productNew product

Coolant replacement frequency

New product

3.0Standard

5. Specifications/Dimension diagram

2.0

5. 1 Specifications

1.000

1 000

2 000

3 0004 0005 000Roundness◆ Resolves roundness defects due to wheel surface
clogging
Example: Rack shaft outer diameter grinding
10GoodNumber of defects, number/month

1.5

Clean tank
Dirty tank

1210864
20

Example: Rack shaft outer diameter grinding

2GoodDressing frequency, rate

NEW PRODUCT

Model

Maximum
treatment amount［L/min］

Magnetseparator

CycloneReservoir
capacity
［L］

K100

100

MX-120A

CCX-100
1 pc.

370 L

K200

200

MX-240A

CCX-100
2 pcs.

700 L

Model

A [mm]

B [mm]

C [mm]

D [mm]

K100

1 775

1 192

500

530K2002 145

1 392

650680Roundness defect

5. 2 Dimension diagram
0.5

Current product

Main tank

New productRoundness defect

Recovery tank
To main tankDB

4. 2 Reduction of running cost
◆ Reduces the amount of chips adhered to the wheel
surface, maintains wheel cutting quality over long
periods, and extends wheel service life

FromgrinderC

From recovery tank A
Dirty tank

Clean tank

(Machine Tools Development Dept., Machine Tools & Mechatronics Operations Headquarters)

JTEKT CORPORATION108

JTEKT ENGINEERING JOURNAL English Edition No. 1012E (2015)