■Ball Screw
|
| Features of Ball Screws |
（1）High
Reliability |
| HSKhas very stringent quality control
standards covering every production process.With proper lubrication
and use,trouble-free operation for an extended period of time is
possible. |
|
|
|
|
Lead Angle (Degrees) |
| |
|
|
| |
Normal usage (to
convert rotary motion to linear motion) |
| |
（μ：friction coefficient） |
| |
|
|
| |
|
T=Torque Kgf·cm |
P=Force Kgf |
l=Lead cm |
η1=Efficiency |
（2）Smooth
Operation |
The high
efficiency of ball screws is vastly superior to conventional screws
as shown in Fig.1.1.The torque required is less than 30%.Linear
motion can be easily changed from rotary motion. |
逆
效
率
(%) |
 |
Lead Angle (Degrees) |
| |
| Special usage(to convert linear motion
to rotary motion) |
| （μ：friction coefficient） |
| |
| |
 |
T=Torque Kgf·cm |
| P=Force Kgf |
| l=Lead cm |
| η2=Efficiency |
（3）High
Rigidity and Preload |
When
axial play is minimized in conventional screw-nut assemblies,the
actuating torque becomes excessive and the operation is not smooth.The
axial play in TBI precision ball screws may be reduced to zero
by preloading and a light smooth operation is still possible.Therefore,both
low torque and high rigidity can be obtained simultaneously.
HSK ball screws have gothic arch groove profiles (Fig.1.2)which
allow these conditions to be achieved. |
 |
| Fig.1.2 Groove
Shape of BSK Precision Ball Screw |
（4）Circulation
Method |
Fig.1.3
is ball return tube method.(T type、E type)
Fig.1.4 is ball defelector method.(Itype、K type)
|
 |
 |
| Fig.1.3 Ball Return Tube
method |
Fig.1.4 Ball Deflector method |
（5）High
Durability |
Rigidly
selected materials,intensive heat treating and processing techniques,backed
by years of experience,have resulted in the most durable ball
screws manufactured.(As show Table 1.1 and Fig.1.5) |
| Table 1.1 Material and Heat Treatment |
| ITEM |
MATERIAL |
HEAT TREATMENT |
HARDNESS |
| SCREW |
SCM450
S55C |
INDUCTION HEATING HARDENING |
HRC58°～62° |
| NUT |
SCM415 |
CARBONIZING HARDENING |
HRC58°～62° |
| STELL BALL |
SUJ2 |
|
HRC60° UP |
|
 |
| Fig.1.5 Heat Treatment |
