Processing system, display system, processing apparatus, processing method, and record medium that determines process period and sampling frequency for AD converter for cutting tool

Patent metadata

Field	Value
Publication number	US-12285834-B2
Application number	US-202018265262-A
Country	US
Kind code	B2
Filing date	Dec 10, 2020
Priority date	Dec 10, 2020
Publication date	Apr 29, 2025
Grant date	Apr 29, 2025

Abstract

A processing system includes a cutting tool, a sensor attached to the cutting tool, an analog-to-digital (AD) converter configured to perform sampling on an analog signal output from the sensor to generate a digital signal, and a processing unit. The processing unit is configured to, based on a rotation rate [rpm] of a rotor; an upper-limit period that is an upper-limit value of a process period; and an upper-limit pitch that is an upper-limit value of an angle pitch [degree], determine the process period and a sampling frequency with which the AD converter performs sampling such that a set value of the angle pitch is equal to the upper-limit pitch or less in a time period taken by the rotor to rotate N times with the process period that is equal to the upper-limit period or shorter.

First claim

The invention claimed is:

1. A processing system comprising:
a cutting tool;
a sensor attached to the cutting tool;
an AD (analog-to-digital) converter configured to perform sampling on an analog signal output from the sensor to generate a digital signal; and
a processor,
the processor being configured to determine a process period and a sampling frequency with which the AD converter performs sampling, based on (1) a rotation rate [rpm] of a rotor that rotates about a rotation axis, (2) an upper-limit period that is an upper-limit value of the process period, and (3) an upper-limit pitch that is an upper-limit value of an angle pitch [degree], the process period being a period with which a predetermined process is performed using the digital signal generated by the AD converter, the angle pitch being a rotation angle between two adjacent sampling time points in a coordinate system representing a phase at a time point of sampling performed by the AD converter in a rotation circle that is a path of a point that rotates about the rotation axis as the rotor rotates, wherein the processor is configured to determine the process period and the sampling frequency with which the AD converter performs sampling such that a set value of the angle pitch is equal to the upper-limit pitch or less in a time period taken by the rotor to rotate N times with the process period that is equal to the upper-limit period or shorter, wherein
N and (360/ps) are integers of 2 or greater and are relatively prime, where ps denotes the set value, and
wherein the processor being configured to determine the sampling frequency and the process period such that N×ps<180 is satisfied.

2. The processing system according to claim 1 , wherein the processor is configured to acquire an upper-limit frequency that is an upper-limit value in the AD converter, and determine the sampling frequency that is equal to the acquired upper-limit frequency or lower.

3. The processing system according to claim 2 , wherein the processor is configured to determine a value of N that satisfies Expressions (1) to (4), and determine the sampling frequency and the process period, based on the determined value of N, the Expressions (1) to (4) being
F =(6× S )/( N×ps )  (1),

T =(60× N )/ S   (2),

T≤T max  (3), and

F≤F max  (4),

where S denotes the rotation rate, F denotes the sampling frequency, Fmax denotes the upper-limit frequency, T denotes the process period, and Tmax denotes the upper-limit period.

4. The processing system according to claim 1 , wherein the processor is configured to determine, as the process period, a smallest value among values selectable as the process period.

5. The processing system according to claim 1 ,
wherein the processor is configured to perform, as the predetermined process, a judgment process related to an abnormality in cutting processing in which the cutting tool is used by using the digital signal generated by the AD converter at a timing according to the process period determined by the processor.

6. The processing system according to claim 1 ,
wherein the processor is configured to perform a process of generating two-dimensional data at each sampling time, based on the digital signal generated by the AD converter, the two-dimensional data relating to loads which the cutting tool receives in two directions, and perform, as the predetermined process, an update process of updating the two-dimensional data at a timing according to the process period determined by the processor.

7. The processing system according to claim 6 , the processor is configured to interpolate the digital signal, based on the generated two-dimensional data.

8. The processing system according to claim 1 , wherein
the rotor is the cutting tool, and
the cutting tool is a milling tool.

9. The processing system according to claim 1 , wherein
the rotor is a workpiece subjected to cutting, and
the cutting tool is a turning tool.

10. A processing apparatus comprising:
a processor configured to
acquire a rotation rate [rpm] of a rotor that rotates about a rotation axis,
acquire an upper-limit period that is an upper-limit value of a process period that is a period with which a predetermined process is performed using a digital signal generated by an AD converter, the AD converter being configured to perform sampling on an analog signal output from a sensor attached to a cutting tool,
acquire an upper-limit pitch that is an upper-limit value of an angle pitch [degree] that is a rotation angle between two adjacent sampling time points in a coordinate system representing a phase at a time point of sampling performed by the AD converter in a rotation circle that is a path of a point that rotates about the rotation axis as the rotor rotates,
based on the rotation rate, the upper-limit period, and the upper-limit pitch, determine the process period and a sampling frequency with which the AD converter performs sampling such that a set value of the angle pitch is equal to the upper-limit pitch or less in a time period taken by the rotor to rotate N times with the process period that is equal to the upper-limit period or shorter, and
control the AD converter based on the process period and the sampling frequency, wherein
N and (360/ps) are integers of 2 or greater and are relatively prime, where ps denotes the set value, and
determine the sampling frequency and the process period such that N×ps<180 is satisfied.

11. A processing method in a processing apparatus, comprising:
acquiring a rotation rate [rpm] of a rotor that rotates about a rotation axis;
acquiring an upper-limit period that is an upper-limit value of a process period that is a period with which a predetermined process is performed using a digital signal generated by an AD converter, the AD converter being configured to perform sampling on an analog signal output from a sensor attached to a cutting tool;
acquiring an upper-limit pitch that is an upper-limit value of an angle pitch [degree] that is a rotation angle between two adjacent sampling time points in a coordinate system representing a phase at a time point of sampling performed by the AD converter in a rotation circle that is a path of a point that rotates about the rotation axis as the rotor rotates;
based on the acquired rotation rate, the acquired upper-limit period, and the acquired upper-limit pitch, determining the process period and a sampling frequency with which the AD converter performs sampling such that a set value of the angle pitch is equal to the upper-limit pitch or less in a time period taken by the rotor to rotate N times with the process period that is equal to the upper-limit period or shorter, and
control the AD converter based on the process period and the sampling frequency, wherein
N and (360/ps) are integers of 2 or greater and are relatively prime, where ps denotes the set value, and
determining the process period and the sampling frequency such that N×ps<180 is satisfied.

12. A non-transitory computer readable medium including executable instructions, which when executed by a computer cause the computer to:
acquire a rotation rate [rpm] of a rotor that rotates about a rotation axis,
acquire an upper-limit period that is an upper-limit value of a process period that is a period with which a predetermined process is performed using a digital signal generated by an AD converter, the AD converter being configured to perform sampling on an analog signal output from a sensor attached to a cutting tool,
acquire an upper-limit pitch that is an upper-limit value of an angle pitch [degree] that is a rotation angle between two adjacent sampling tim

Assignees

• Sumitomo Electric Industries

Inventors

• Koike Yusuke

Classifications

• G01L5/16

  for measuring several components of force · CPC title

• G01L5/0076

  Force sensors associated with manufacturing machines (G01L5/0066, G01L5/0071 and B23Q17/09 take precedence; for the specific machine or operation involved see relevant class, e.g. B21 - B42) · CPC title

• G01L5/1627

  of strain gauges (using piezoresistors G01L5/162) · CPC title

• B23Q17/0952 Primary

  during machining · CPC title

• B23Q17/0966 Primary

  by measuring a force on parts of the machine other than a motor · CPC title