US 11,679,465 B2Granted

Machine tool adjustment method and system thereof

AssigneeIndustrial Technology Research Institute

InventorsChen-Hui Kuo, Tian-You Hou, Jia-Cheng Sun, Chen-Yu Kai, Yung-Chih Lin

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Abstract

This disclosure provides a machine tool adjustment method and system thereof. The machine tool adjustment method includes the following steps: enabling a machine tool to perform a circular test; obtaining a measured error value Em from a measuring instrument, and the measured error value Em is defined by the difference between the actual circular trajectory and the preset circular trajectory during the circular test; determining an error condition of the tool machine from the measured error value Em; determining whether the error condition is less than a predetermined criteria; if not, defining a compensation parameter according to the error condition and enabling the machine tool to perform another circular test according to the set compensation parameter until the error condition is less than the predetermined criteria; and if yes, ending the circular test and the machine tool adjustment is finished.

Claims12

Dependent claims

A machine tool adjustment method for adjusting a machine tool comprising a controller, comprising:

issuing a circular test instruction to enable the machine tool to perform a circular test;
obtaining a measured error value Em from a measuring instrument, wherein the measured error value Em is defined by a difference between an actual circular trajectory when the machine tool performs the circular test and a preset circular trajectory;
determining an error condition of the machine tool from the measured error value Em;
determining whether the error condition is less than a predetermined criteria;
if not, defining a compensation parameter according to the error condition, providing the compensation parameter to the controller to set the compensation parameter to enable the machine tool to perform another circular test according to the compensation parameter that is set, and repeating the above step until it is determined that the error condition is less than the predetermined criteria;
and
if it is determined that the error condition is less than the predetermined criteria, ending the circular test and completing adjustment of the machine tool;
wherein the step of determining the error condition of the machine tool from the measured error value Em comprises:
calculating a radius deviation Rd and an axial offset value Ad from the measured error value Em;
calculating a corrected axis coordinate value from the radius deviation Rd and the axial offset value Ad;
and
calculating a corrected error value Ec from the corrected axis coordinate value, wherein
the measured error value Em is defined by a difference between an actual radius ra of the actual circular trajectory when the machine tool performs the circular test and a preset radius rd of the preset circular trajectory that is set before the circular test is performed;
the radius deviation
R
d
=
∑
1
n
E
m
n
,
n is the number of times of obtaining the measured error value;
the axial offset value
A
d
=
∑
1
n
E
m
′
n
,
Em′ is uniaxial component of the measured error value Em;
the corrected axis coordinate value can be calculated through the following formula:
corrected 1st axis coordinate value x1′=−1st axial offset value Ad1+(the preset radius rd+the measured error value Em−the radius deviation Rd)×cos θ,
corrected 2nd axis coordinate value x2′=−2nd axial offset value Ad2+(the preset radius rd+the measured error value Em−the radius deviation Rd)×sin θ, and θ is between 0 and 360 degrees;
and
the corrected error value Ec can be calculated through the following formula:
corrected
⁢
error
⁢
value
⁢
⁢
E
c
=
(
corrected
⁢
l
⁢
st
⁢
axis
⁢
coordinate
⁢
value
⁢
x
1
′
)
2
+
(
corrected
⁢
2
⁢
nd
⁢
axis
⁢
coordinate
⁢
value
⁢
x
2
′
)
2
-
the
⁢
preset
⁢
radius
⁢
r
d
.

97 more elements

A machine tool adjustment method for adjusting a machine tool comprising a controller, comprising:

issuing a circular test instruction to enable the machine tool to perform multiple circular tests at multiple speeds, respectively;
obtaining multiple measured error values respectively by a measuring instrument, wherein the measured error values are defined by a difference between an actual circular trajectory when the machine tool performs each of the multiple circular test at the multiple speeds respectively and a preset circular trajectory respectively generated;
determining respective error conditions of the machine tool corresponding to the speeds in performing each of the multiple circular tests according to the measured error values Em;
defining multiple compensation parameters respectively corresponding to the speeds according to each of the error conditions;
defining a final compensation parameter according to the compensation parameters;
and
ending the multiple circular tests, and providing the final compensation parameter to the controller so that the controller completes adjustment of the machine tool according to the final compensation parameter;
wherein the step of determining respective error conditions of the machine tool corresponding to the speeds in performing the circular test comprises:
calculating a radius deviation Rd and an axial offset value Ad from the measured error value Em;
calculating a corrected axis coordinate value from the radius deviation Rd and the axial offset value Ad;
and
calculating a corrected error value Ec from the corrected axis coordinate value, wherein
the measured error value Em is defined by a difference between an actual radius ra of the actual circular trajectory when the machine tool performs the circular test and a preset radius rd of the preset circular trajectory that is set before the circular test is performed;
the radius deviation
R
d
=
∑
1
n
E
m
n
,
n is the number of times of obtaining the measured error value;
the axial offset value
A
d
=
∑
1
n
E
m
′
n
,
Em′ is uniaxial component of the measured error value Em;
the corrected axis coordinate value can be calculated through the following formula:
corrected 1st axis coordinate value x1′=−1st axial offset value Ad1+(the preset radius rd+the measured error value Em−the radius deviation Rd)×cos θ,
corrected 2nd axis coordinate value x2′=−2nd axial offset value Ad2+(the preset radius rd+the measured error value Em−the radius deviation Rd)×sin θ, and θ is between 0 and 360 degrees;
and
the corrected error value Ec can be calculated through the following formula:
corrected
⁢
error
⁢
value
⁢
⁢
E
c
=
(
corrected
⁢
l
⁢
st
⁢
axis
⁢
coordinate
⁢
value
⁢
x
1
′
)
2
+
(
corrected
⁢
2
⁢
nd
⁢
axis
⁢
coordinate
⁢
value
⁢
x
2
′
)
2
-
the
⁢
preset
⁢
radius
⁢
r
d
.

97 more elements

A machine tool adjustment system for adjusting a machine tool, comprising:

a memory configured to store an error analysis module and an error compensation module;
and
a processor coupled to the memory and configured to execute the error analysis module and the error compensation module, wherein the processor executes the error analysis module to perform the following steps:
obtaining a measured error value Em from a measuring instrument, wherein the measured error value Em is defined by a difference between an actual circular trajectory when the machine tool performs the circular test and a preset circular trajectory;
and
determining an error condition of the machine tool from the measured error value Em;
and
the processor executes the error compensation module to perform the following steps:
determining whether the error condition is less than a predetermined criteria;
if not, defining a compensation parameter according to the error condition, and providing the compensation parameter to a controller of the machine tool to set the compensation parameter so that the machine tool starts another circular test according to the set compensation parameter and repeats the above step until it is determined that the error condition is less than the predetermined criteria;
and
if it is determined that the error condition is less than the predetermined criteria, notifying the controller of the machine tool to end the circular test and complete adjustment of the machine tool;
wherein the processor executes the error analysis module to further perform the following steps:
calculating a radius deviation Rd and an axial offset value Ad from the measured error value Em;
calculating a corrected axis coordinate value from the radius deviation Rd and the axial offset value Ad;
and
calculating a corrected error value Ec from the corrected axis coordinate value, wherein
the measured error value Em is defined by a difference between an actual radius ra of the actual circular trajectory when the machine tool performs the circular test and a preset radius rd of the preset circular trajectory that is set before the circular test is performed;
the radius deviation
R
d
=
∑
1
n
E
m
n
,
n is the number of times of obtaining the measured error value;
the axial offset value
A
d
=
∑
1
n
E
m
′
n
,
Em′ is uniaxial component of the measured error value Em;
the corrected axis coordinate value can be calculated through the following formula:
corrected 1st axis coordinate value x1′=−1st axial offset value Ad1+(the preset radius rd+the measured error value Em−the radius deviation Rd)×cos θ,
corrected 2nd axis coordinate value x2′=−2nd axial offset value Ad2+(the preset radius rd+the measured error value Em−the radius deviation Rd)×sin θ, and θ is between 0 and 360 degrees;
and
the corrected error value Ec can be calculated through the following formula:
corrected
⁢
error
⁢
value
⁢
⁢
E
c
=
(
corrected
⁢
l
⁢
st
⁢
axis
⁢
coordinate
⁢
value
⁢
x
1
′
)
2
+
(
corrected
⁢
2
⁢
nd
⁢
axis
⁢
coordinate
⁢
value
⁢
x
2
′
)
2
-
the
⁢
preset
⁢
radius
⁢
r
d
.

102 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/823,348Filed 19 Mar 2020
Priority: TW 10910273530 Jan 2020
Published: US 2021/0237218 A15 Aug 2021
Granted: 20 Jun 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

B23Q 17/22
Arrangements for observing, indicating or measuring on machine tools: for indicating or measuring existing or desired position of tool or work
B23Q 17/2233
For indicating or measuring existing or desired position of tool or work: for adjusting the tool relative to the workpiece
B23Q 17/10
Arrangements for observing, indicating or measuring on machine tools: for indicating or measuring cutting speed or number of revolutions
G05B 19/401
Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to…