NEW PRODUCTCompact Cylindrical Grinding Machine with CBN Wheels
CBN wheels are superior in hardness and heat
conduction and enable high peripheral speed from thestructural side of grinding wheels, so that they bring agreat effect for improvement of the productivity and thereduction of tool cost.
Due to the larger size of the supplementary equipment
including motor for power, main body of equipment andcoolant tanks as a grinder, CBN wheels were used mostly
for such works with high unit price as camshaft andcrankshaft.
On the other hand, as for transmission parts and smallsized accessory parts, conventional normal grinding
wheels were commonly used for grinding, and expensive
CBN wheels were not used so much. Under thesecircumstances, based on CBN grinding technology andautomation technology of truing which HOUKO has
cultivated over many years in the field of grinder, wedeveloped a compact cylindrical grinding machine with
CBN wheels for the grinding of transmission parts andsmall-sized accessory parts.

Purpose of Development
With the concept of "small, light and beautiful," this product has higher superiority to cylindrical grinder withspecifications of normal grinding wheels in energy saving, space saving and low running cost.

Features
The equal processing ability with a conventional type is maintained by adopting CBN wheels, and this machine size ismore compact than a conventional one.
R&D items

Viewpoint/Measures

Contents

Adoption of CBN wheels

Extension of dressing interval
Shortening of non-processing time

510mm normal grinding wheels⇒350mm CBN wheels

Downsizing of control panel

Downsizing of electrical equipment
Wiring-saving

Control panel volume3
30.4 m ⇒0.33 mDownsizing of grinding wheels
and motor

Wheel spindle by smaller diameter ofgrinding wheels
Downsizing of motor

Motor capacity
5.5kW⇒3.7kW

Downsizing of hydraulic unit

Minimization of tank capacity

Tank volume
20 L⇒10 L

Downsizing of coolant pump

Optimization of coolant discharge

Pump motor capacity
0.4kW⇒0.18kW

Lower position of center height

Improvement of work eﬃciency (No stool)

Center height
1 080mm⇒1 000mm

HOUKO CO., LTD.
JTEKT Engineering Journal English Edition No. 1004E (2008)143

NEW PRODUCTComposition
Optimization of peripheral devices and the ability withsmaller equipment in size

●Low cost ●Energy saving ●Space saving●●●Downsizing of grindingwheels and motor●●Adoption of CBN wheels●●●Downsizing of
coolant pump

●Low center height●●Downsizing ofcontrol panel
Universal cylindrical grinder
GL3P-25SⅡ●●●Downsizing of
hydraulic unit

Performance
▲40%

100

Cost ratio1) Reduction of running cost
· Dressing interval: 10 pieces per dress⇒600 pieces per dress (60times)· Grinding wheel switching cost: 1 month per time⇒15 months pertime (1/15)· Cost reduction of quality confirmation by wheel diameter change· Largely decreased quantity of abrasive grain mixtures into coolanttank⇒Reduction of maintenance cost

60

Conventional(Normal grindingwheels)

Newly developed(CBN wheels)

40% reduction of running cost

Electricity
consumption ratio2) Energy saving
Downsizing of equipment is made possible by adoption of CBNwheels.
· Lower capacity of wheel spindle motor: 5.5kW⇒3.7kW· Lower capacity of coolant discharge motor: 0.4kW⇒0.18kW

10072

Conventional(Normal grindingwheels)

28% reduction of electricity consumption▲28%

Newly developed(CBN wheels)3) Space saving
Example of grinding line of drive unit parts
OP.2

OP.3
OP.2

OP.3

2.4 m

2.4 m

2.5 m

4m

OP.1

2.4 m

1.9 m

8.5 m
Conventional (Normal grinding wheels)

1.9 m

1.9 m

7m
Newly developed (CBN wheels)

Floor space ratio

OP.1

100

Conventional(Normal grindingwheels)▲40%60

Newly developed(CBN wheels)

40% reduction of floor space

HOUKO CO., LTD.
144

JTEKT Engineering Journal English Edition No. 1004E (2008)