Spindle device for a program-controlled machine tool

Patent metadata

Field	Value
Publication number	US-10369673-B2
Application number	US-201615548276-A
Country	US
Kind code	B2
Filing date	Feb 2, 2016
Priority date	Feb 2, 2015
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

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.

First claim

The invention claimed is:

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.

2. The spindle device according to claim 1 , wherein
the structure-borne sound sensor is configured as an annular structure-borne sound sensor.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. The spindle device according to claim 4 , wherein
the first ring element is fastened to the spindle housing in a rotationally fixed manner.

10. 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.

11. 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.

12. 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.

13. 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.

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.

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.

Assignees

• Deckel Maho Pfronten Gmbh

Inventors

• Veittinger Hans

Classifications

• G01N29/14

  using acoustic emission techniques {(echo of particles G01N29/046; measuring mechanical vibrations or acoustic waves in solids in general G01H1/00)} · CPC title

• B24B49/003

  involving acoustic means · CPC title

• B24B41/04

  Headstocks; Working-spindles; Features relating thereto · CPC title

• B23Q17/2241

  Detection of contact between tool and workpiece · CPC title

• B23Q17/12 Primary

  for indicating or measuring vibration · CPC title