US 7,925,373 B2Granted

Machine tool and control method thereof

AssigneeFoxnum Technology Co., Ltd.

InventorsWei-Ming Hsu, Jhy-Hau Chiu

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Abstract

An acceleration/deceleration control method of a CNC machine tool includes receiving an acceleration/deceleration timing signal and a velocity signal. The acceleration/deceleration timing signal is calculated to acquire a plurality of different first weight values and different second weight values by a first formula and a second formula. A velocity variation of the velocity signal is determined to be zero, positive or negative. The velocity signal is acquired, if the velocity variation is zero. A plurality of acceleration signals are acquired by the velocity signal multiplying each of the first weight values, if the velocity variable is positive. A plurality of deceleration signals are acquired by the velocity signal multiplying each of the second weight values, if the velocity variation is negative. The velocity signal, the acceleration signal and the deceleration signal are converted into a first driving signal, a second driving signal and a third driving signal.

Claims16

Dependent claims

An acceleration/deceleration control method of a computerized numerical control machine tool, the method comprising:

receiving an acceleration/deceleration timing signal;
receiving a velocity signal;
calculating the acceleration/deceleration timing signal to acquire a plurality of different first weight values and a plurality of different second weight values respectively by a first formula and a second formula, respectively, wherein the first formula is:
f
⁡
(
w
⁢
⁢
1
)
=
0.5
⁡
[
sin
⁡
(
θ
⁢
⁢
1
+
3
⁢
π
2
)
+
1
]
where f(w1) is the first weight value, θ1 is from 0 to π/2, and the second formula is:
f
⁡
(
w
⁢
⁢
2
)
=
0.5
⁡
[
sin
⁡
(
θ
⁢
⁢
2
+
π
2
)
+
1
]
where f(w2) is the second weight value, θ2 is from 0 to π/2, θ1 and θ2 correspond to a value of the acceleration/deceleration timing signal;
determining whether a velocity variation of the velocity signal is zero, positive or negative, wherein the velocity variation is a difference between the velocity signal and a preceding velocity signal;
if the velocity variation is zero, outputting the velocity signal;
if the velocity variable is positive, acquiring a plurality of acceleration signals by the velocity signal multiplying each of the first weight values;
if the velocity variation is negative, acquiring a plurality of deceleration signals by the velocity signal multiplying each of the second weight values;
and
converting and transmitting the velocity signal, the acceleration signal and the deceleration signal into a first driving signal, a second driving signal and a third driving signal, respectively.

62 more elements

A computerized numerical control machine tool, comprising:

an input unit capable of receiving and transmitting an acceleration/deceleration timing signal and a velocity signal;
a control unit coupled with the input unit and comprising a first formula module and a second formula module, the two formula modules being capable of calculating the acceleration/deceleration timing signal to acquire a plurality of different first weight values and a plurality of different second weight values by the first formula and the second formula, acquiring a plurality of acceleration signals by the velocity signal multiplying the first weight values, and acquiring a plurality of deceleration signals by the velocity signal multiplying the second weight values, the control unit being further capable of determining whether velocity variation of the velocity signal is zero, positive or negative, wherein the velocity variation is a difference between the present velocity signal and the preceding velocity signal, where the first formula is:
f
⁡
(
w
⁢
⁢
1
)
=
0.5
⁡
[
sin
⁡
(
θ
⁢
⁢
1
+
3
⁢
π
2
)
+
1
]
where f(w1) is the first weight value, θ1 is from 0 to π/2, and the second formula is:
f
⁡
(
w
⁢
⁢
2
)
=
0.5
⁡
[
sin
⁡
(
θ
⁢
⁢
2
+
π
2
)
⁢
1
]
where f(w2) is the second weight value, θ2 is from 0 to π/2, and a θ1 and θ2 respectively correspond to a value of the acceleration/deceleration timing signal;
a drive unit coupled with the control unit and capable of converting the velocity signal, a acceleration signal and a deceleration signal to a first driving signal, a second driving signal and a third driving signal;
and
a motor coupled with the drive unit, the drive unit according to the first driving signal, the second driving signal and the third driving signal being capable of controlling a direction and a rotation speed of the motor.

58 more elements

Dependencies are inferred from the claim text.