# US 2024/0201044 A1 · Abnormality detection device, abnormality detection system, abnormality detection method, and computer readable medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0201044 A1 - Document ID: US20240201044A1 - Status: Published application - Kind: A1 - Application number: 18/596,751 - Filed: 2024-03-06 - Published: 2024-06-20 - Earliest claimed: 2021-12-24 - Assignees: Denso Corporation - Applicants: Denso Corporation - Inventors: TAKESHI MORINAGA; JUNKI KAWAGUCHI; YUJI KOYAMA; TETSUTO KAWAI - Web page: https://patentgrep.com/patent/US20240201044A1 ## CPC - G01M 7/025: {Measuring arrangements} - B23Q 17/09: for indicating or measuring cutting pressure or {for determining} cutting-tool condition, e.g. cutting ability, load on tool (arrangements preventing overload of tools B23Q11/04; devices for indicating failure of drills during boring B23B49/00) - B23Q 17/24: using optics {or electromagnetic waves} - G01B 11/24: for measuring contours or curvatures - G01M 99/00: Subject matter not provided for in other groups of this subclass - G05B 19/18: Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of program data in numerical form (G05B19/418 takes precedence) - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR - B23Q: DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING (tools of the kind used in lathes or boring machines B23B27/00); MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS - G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G) ## Abstract An abnormality detection system acquires a frequency component of sound generated by cutting by a cutting machine. A calculation section calculates a value obtained by smoothing a value related to an intensity corresponding to a frequency in a predetermined range including a frequency at which wear occurs due to working of the machine in the frequency component. The abnormality detection device determines that the tool is abnormal when the smoothed value is outside the range between the damage threshold and the wear threshold. ## Claims ### Claim 1 An abnormality detection device, comprising: an analysis section configured to acquire a frequency component of physical quantity generated by working by a machine; a calculation section configured to calculate a value obtained by smoothing a value related to an intensity corresponding to a frequency in a predetermined range including a frequency at which wear occurs due to working of the machine in the frequency component; and a determination section configured to determine that the machine is abnormal when the value smoothed by the calculation section is outside a range between a damage threshold and a wear threshold. ### Claim 2 (depends on 1) The abnormality detection device according to claim 1, wherein the value related to the intensity corresponding to the frequency in the predetermined range is a value obtained by subtracting the value related to the intensity corresponding to the frequency included in the predetermined range among the frequencies caused by a rotation of a tool of the machine from the value related to the intensity corresponding to the frequency in the predetermined range, and the calculation section calculates a value obtained by smoothing the subtracted value. ### Claim 3 (depends on 1) The abnormality detection device according to claim 1, wherein the value related to the intensity corresponding to the frequency in the predetermined range is a value obtained by subtracting the value related to the intensity corresponding to the frequency included in the predetermined range among the frequencies of the physical quantity that occurs when the machine idles from the value related to the intensity corresponding to the frequency in the predetermined range, the calculation section calculates a value obtained by smoothing the subtracted value. ### Claim 4 (depends on 1) The abnormality detection device according to claim 1, wherein the calculation section calculates a peak value that is larger than a peak value related to wear due to working of the machine that is included in the frequency in the predetermined range. ### Claim 5 (depends on 1) The abnormality detection device according to claim 1, wherein the determination section determines that the tool of the machine is abnormal due to wear when the value smoothed by the calculation section is equal to or greater than the wear threshold. ### Claim 6 (depends on 1) The abnormality detection device according to claim 1, wherein the damage threshold is smaller than the wear threshold, and the determination section determines that a tool of the machine is damaged when the value smoothed by the calculation section changes from equal to or higher than the wear threshold to lower than the damage threshold. ### Claim 7 (depends on 5) The abnormality detection device according to claim 5, wherein the determination section determines that the tool is abnormal due to wear when an integrated value of the values smoothed by the calculation section is equal to or greater than a threshold value. ### Claim 8 (depends on 1) The abnormality detection device according to claim 1, wherein the analysis section acquires a frequency component of the physical quantity detected by a plurality of sensors. ### Claim 9 (depends on 1) The abnormality detection device according to claim 1, wherein the abnormality detection device is connected to a network and communicates with the machine via the network. ### Claim 10 (depends on 1) The abnormality detection device according to claim 1, further comprising: a notification section that causes an alarm device to notify that the machine is abnormal when the determination section determines that the machine is abnormal. ### Claim 11 (depends on 1) The abnormality detection device according to claim 1, further comprising: an exchange section that causes a tool changer to automatically exchange the tool of the machine when the determination section determines that the machine is abnormal. ### Claim 12 (depends on 1) The abnormality detection device according to claim 1, further comprising: a measuring section that causes a measuring instrument that measures a shape of a tool of the machine to measure the shape of the tool, when the determination section determines that the machine is abnormal, and a degree calculation section that calculates a degree of abnormality of the tool by calculating a change in shape of the tool. ### Claim 13 An abnormality detection system, comprising: a sensor configured to detect a physical quantity generated by working by a machine; an abnormality detection device including an analysis section configured to acquire a frequency component of the physical quantity, a calculation section configured to calculate a value obtained by smoothing a value related to an intensity corresponding to a frequency in a predetermined range including a frequency at which wear occurs due to working of the machine in the frequency component, and a determination section configured to determine that the machine is abnormal when the value smoothed by the calculation section is outside a range between a damage threshold and a wear threshold. ### Claim 14 A method for detecting an abnormality, comprising: acquiring a frequency component of physical quantity generated by working by a machine; calculating a value obtained by smoothing a value related to an intensity corresponding to a frequency in a predetermined range including a frequency at which wear occurs due to working of the machine in the frequency component; and determining that the machine is abnormal when the smoothed value is outside a range between a damage threshold and a wear threshold. ### Claim 15 A computer readable medium, comprising: an abnormality detection program configured to cause an abnormality detection device to function as an analysis section configured to acquire a frequency component of physical quantity generated by working by a machine; a calculation section configured to calculate a value obtained by smoothing a value related to an intensity corresponding to a frequency in a predetermined range including a frequency at which wear occurs due to working of the machine in the frequency component, and a determination section configured to determine that the machine is abnormal when the value smoothed by the calculation section is outside a range between a damage threshold and a wear threshold.