# US 10,369,673 B2 · Spindle device for a program-controlled machine tool > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,369,673 B2 - Document ID: US10369673B2 - Status: Granted - Kind: B2 - Application number: 15/548,276 - Filed: 2016-02-02 - Published: 2018-01-25 - Granted: 2019-08-06 - Earliest claimed: 2015-02-02 - Assignees: Deckel Maho Pfronten GmbH - Applicants: Deckel Maho Pfronten GmbH - Inventors: Hans Veittinger - Web page: https://patentgrep.com/patent/US10369673B2 ## CPC - B23Q 17/12: for indicating or measuring vibration - B23Q 1/70: Stationary or movable members for carrying working-spindles for attachment of tools or work {(B23Q1/01 takes precedence; designed to be moved by using particular mechanisms B23Q1/44)} - B23Q 3/12: for securing to a spindle in general (B23Q3/152 takes precedence; chucks B23B31/02) - B23Q 5/043: {Accessories for spindle drives} - B23Q 17/0971: {by measuring mechanical vibrations of parts of the machine (arrangements for measuring vibrations B23Q17/12)} - B23Q 17/2241: {Detection of contact between tool and workpiece} - B24B 41/04: Headstocks; Working-spindles; Features relating thereto - B24B 49/003: {involving acoustic means} - G01N 29/14: using acoustic emission techniques {(echo of particles G01N29/046; measuring mechanical vibrations or acoustic waves in solids in general G01H1/00)} - B23Q 2220/006: Spindle heads - B23Q 2717/00: Arrangements for indicating or measuring - 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 - B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) ## Abstract A machining unit for a program-controlled machine tool. In particular, a spindle device for a program-controlled machine tool including a spindle housing; a working spindle which is mounted in the spindle housing in a rotatable manner about a spindle axis and which includes a clamping device for clamping a tool interface that is inserted in a tool receiving section of the spindle device and is configured to hold a milling or boring tool; and a sensor device which is arranged on the spindle housing and which includes at least one structure-borne sound sensor configured to detect structure-borne sounds or vibrations occurring during grinding operations. ## Claims ### Claim 1 A spindle device for a program-controlled machine tool, comprising: a spindle housing, a working spindle rotatably mounted about a spindle axis in the spindle housing and comprising a clamping device for clamping a tool interface, which is inserted in a tool receiving portion of the spindle device and configured to hold a tool, and a sensor device arranged on the spindle housing at a front face of the working spindle and including at least one structure-borne sound sensor which is configured to detect structure-borne sound waves or vibrations occurring during grinding operations. ### Claim 2 (depends on 1) The spindle device according to claim 1, wherein the structure-borne sound sensor is configured as an annular structure-borne sound sensor. ### Claim 3 (depends on 2) The spindle device according to claim 2, wherein the annular structure-borne sound sensor comprises an annular rotor sensor portion and an annular stator sensor portion. ### Claim 4 (depends on 1) The spindle device according to claim 1, further comprising a first ring element and a second ring element, wherein the first ring element is fixedly connected to said spindle housing, and the second ring element is fixedly connected to the rotatably mounted working spindle, and at least a portion of the structure-borne sound sensor is arranged or held on or in at least one of the first and second ring elements. ### Claim 5 (depends on 4) The spindle device according to claim 4, wherein the annular rotor sensor portion is arranged or held in or on the second ring element, and/or the annular stator sensor portion is arranged or held in or on the first ring element. ### Claim 6 (depends on 4) The spindle device according to claim 4, wherein the second ring element is connected in a rotationally fixed manner to a spindle head shaft of the spindle device. ### Claim 7 (depends on 4) The spindle device according to claim 4, wherein an inner portion of the second ring element forms at least a part of the tool receiving portion of the spindle device. ### Claim 8 (depends on 7) The spindle device according to claim 7, wherein the inner portion of the second ring element is in contact with at least a portion of the tool interface when the tool interface is inserted in the tool receiving portion of the spindle device and is clamped by means of the clamping device. ### Claim 9 (depends on 4) The spindle device according to claim 4, wherein the first ring element is fastened to the spindle housing in a rotationally fixed manner. ### Claim 10 (depends on 1) The spindle device according to claim 1, further comprising a plurality of spindle bearings, wherein the structure-borne sound sensor is arranged on a side of the outermost spindle bearing of the plurality of spindle bearings which faces the outer side of the spindle device. ### Claim 11 (depends on 1) The spindle device according to claim 1, further comprising a plurality of spindle bearings, wherein the structure-borne sound sensor is positioned such that none of the spindle bearings is arranged in a direct propagation direction of structure-borne sound waves in the spindle device from the tool receiving portion toward the structure-borne sound sensor. ### Claim 12 (depends on 1) A method of grindingly machining a workpiece on a universally applicable machine tool with a spindle device according to claim 1, comprising: grindingly machining a workpiece clamped on a workpiece clamping means of the machine tool using a grinding tool which is held on a tool interface, which is clamped on the clamping device of the working spindle of the spindle device and is inserted in the tool receiving portion of the spindle device, and detecting the structure-borne sound waves or vibrations occurring during the grinding operations by means of the structure-borne sound sensor of the sensor device of the spindle device. ### Claim 13 (depends on 1) A method of dressing a grinding tool on a universally applicable machine tool with a spindle device according to claim 1, comprising: performing a dressing operation for a grinding tool, which is held on a tool interface, which is clamped on the clamping device of the working spindle of the spindle device and is inserted in the tool receiving portion of the spindle device, on a dressing piece while monitoring the dressing operation on the basis of a structure-borne sound signal of the structure-borne sound sensor of the sensor device of the spindle device. ### Claim 14 A spindle device for a program-controlled machine tool, comprising: a spindle housing, a working spindle rotatably mounted about a spindle axis in the spindle housing and comprising a clamping device for clamping a tool interface, which is inserted in a tool receiving portion of the spindle device and configured to hold a tool, and a sensor device arranged on the spindle housing and including at least one structure-borne sound sensor which is configured to detect structure-borne sound waves or vibrations occurring during grinding operations, and the structure-borne sound sensor is configured as an annular structure-borne sound sensor. ### Claim 15 A spindle device for a program-controlled machine tool, comprising: a spindle housing, a working spindle rotatably mounted about a spindle axis in the spindle housing and comprising a clamping device for clamping a tool interface, which is inserted in a tool receiving portion of the spindle device and configured to hold a tool, a sensor device arranged on the spindle housing and including at least one structure-borne sound sensor which is configured to detect structure-borne sound waves or vibrations occurring during grinding operations, and a first ring element and a second ring element, wherein the first ring element is fixedly connected to said spindle housing, the second ring element is fixedly connected to the rotatably mounted working spindle, and at least a portion of the structure-borne sound sensor is arranged or held on or in at least one of the first and second ring elements, and an inner portion of the second ring element forms at least a part of the tool receiving portion of the spindle device.