Machining Unit for a Machine Tool and Machine Tool Having Such a Machining Unit

• US 20170248190A1
• Filed: 02/24/2017
• Published: 08/31/2017
• Est. Priority Date: 02/26/2016
• Status: Abandoned Application

• Current Assignee: Deckel MAHO Pfronten GmbH (Dmg Mori Co., Ltd.)
• Original Assignee: Deckel MAHO Pfronten GmbH (Dmg Mori Co., Ltd.)
• Inventors: Gnssle-Klenk, Frank
• Application Number:
  US15/442,477
• Publication Number:
  US 20170248190A1
• Time in Patent Office: Days
• CPC Class Codes: B23C 1/12 with spindle adjustable to different angles, e.g. either horizontal or vertical
• CPC Class Codes: B23Q 1/0036 one of those parts being a tool
• CPC Class Codes: B23Q 1/54 two rotating pairs only
• CPC Class Codes: 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
• CPC Class Codes: B23Q 11/0032 Arrangements for preventing or isolating vibrations in parts of the machine B23B29/022, B23D47/005 take precedence; means for damping or suppressing vibrations, in general F16F
• CPC Class Codes: B23Q 11/14 Methods or arrangements for maintaining a constant temperature in parts of machine tools
• CPC Class Codes: B23Q 2220/006 Spindle heads
• CPC Class Codes: F16F 15/02 Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems F16F15/005 takes precedence ; layered products B32B; suppression of vibration in ships B63; relieving load on bearings, using magnetic means F16C39/06
• CPC Class Codes: F16F 7/1005 characterised by active control of the mass
• CPC Class Codes: F16F 7/104 the inertia member being resiliently mounted F16F7/1022 takes precedence
• CPC Class Codes: Y10T 409/303976 with means to control temperature or lubricate
• CPC Class Codes: Y10T 409/304312 with means to dampen vibration
• CPC Class Codes: Y10T 409/307672 Angularly adjustable cutter head
• CPC Class Codes: Y10T 409/309744 including means to compensate for deformation

Abstract

A machining unit for a machine tool includes a carrier head base, which on its rear side includes a carriage. The carriage can be coupled to axis guides and is longitudinally displaceable. The machining unit further includes a spindle carrier head held pivotably on the carrier head base. The spindle carrier head has a spindle with a tool holder. The carrier head base is provided with a damping unit. The disclosed machining unit provides increased precision of a machine tool. The machining unit may be incorporated in a machine tool.

Claims

1. A machining unit for a machine tool, comprising

a carrier head base, and

a spindle carrier head holding a tool-carrying work spindle,

characterized in that said machining unit is provided with a damping unit for damping oscillations occurring during the machining of a workpiece on said machine tool.

2. The machining unit according to claim 1, wherein said carrier head base is provided with said damping unit, and/or said spindle carrier head is provided with said damping unit.

3. The machining unit according to claim 1, wherein said damping unit is arranged on an outer side of a housing of said carrier head base and/or on an outer side of said housing of said spindle carrier head.

4. The machining unit according to claim 1, wherein said damping unit is provided as a separate element, which can be mounted or demounted.

5. The machining unit according to claim 1, wherein said damping unit provides a uniaxial damping and is, in particular, configured to dampen oscillations in a main damping effect direction.

6. The machining unit according to claim 1, wherein a plurality of damping units with respective uniaxial damping are provided, the main damping effect directions thereof being oriented in different directions of said machining unit.

7. The machining unit according to claim 1, wherein said damping unit includes at least one of the following types of damping:

a viscoelastic damping element, a piezoelectric damping element, an electrodynamic damping element and a squeeze film damping element.

8. The machining unit according to claim 1, wherein said damping unit comprises a fluidic damping mechanism with a mass-spring system, in particular on the basis of squeeze-film damping and/or on the basis of throttle flow damping.

9. The machining unit according to claim 1, wherein said damping unit includes a mass element, which is biased by means of springs and which is mounted on guides so as to be capable of oscillating in a main damping effect direction.

10. The machining unit according to claim 1, wherein said mass element is mounted in a fluid-sealed interior space of said damping unit for oscillating movement, and chamber regions of said interior space are at least partially filled with a liquid, in particular with an oil.

11. The machining unit according to claim 1, wherein said damping unit is configured to replace a mass element of the mass-spring system, to insert, remove or replace spring elements of the mass-spring system, and/or to change a fluid of the fluidic damping mechanism.

12. The machining unit according to claim 1, wherein said damping unit comprises a housing including an interior space, in which a mass element supported on a spring element is mounted in an oscillating manner, wherein in said chamber a liquid is provided, which, when said mass element is oscillating, is transferable from a first chamber region formed between said mass element and a chamber wall into a second chamber region formed between said mass element and a chamber wall.

13. The machining unit according to claim 12, wherein said interior space has a cylindrical shape in the circumferential direction thereof and is bounded on the upper and lower sides by planar walls;

said mass element having a cylindrical shape in the circumferential direction thereof and being bounded on the upper and lower sides by planar walls;

wherein a transfer chamber region is arranged between the opposing circumferential walls, and upper side or lower side chamber regions are arranged between the respective upper and lower side planar walls, said chamber regions having a variable receiving volume due to the oscillation of said mass element.

14. The machining unit according to claim 12, wherein said mass element is supported at the upper side and at the lower side by at least one spring element.

15. The machining unit according to claim 12, wherein a plurality of mutually opposite spring elements are provided along the circumferential wall, which support said mass element on the upper side and on the lower side.

16. The machining unit according to claim 12, wherein said at least one spring element is received in a receiving bore on an upper side or lower side wall of said mass element and is fastened to the respective opposite wall of said interior space.

17. The machining unit according to claim 12, wherein guides extending between the upper side of the interior space and the lower side of said interior space are provided such that said mass element is mounted for oscillating movement in a guided manner in the direction of said guides.

18. The machining unit according to claim 12, wherein said guides are formed by rods which protrude through openings extending between the upper side and the lower side surfaces of said mass element.

19. The machining unit according to claim 18, wherein said openings, through which said rods protrude, are provided at equal intervals along the circumference of said mass element.

20. The machining unit according to claim 18, wherein a spring element is provided adjacent to each opening.

21. The machining unit according to claim 20, wherein said housing is temperature-controlled.

22. The machining unit according to claim 21, wherein the temperature of said housing is adjustable.

23. The machining unit according to claim 22, wherein a temperature controller for adjusting the temperature of said housing includes a vibration sensor, a vibration sensor signal of which is supplied to said temperature controller for controlling the temperature of said housing.

24. The machining unit according to claim 1, wherein said housing includes a bottom surface which is mounted on a damping device stand, which is mounted on an outer wall of said machining unit.

25. The machining unit according to claim 24, wherein said damping device stand includes a base surface for said housing and a fastening surface for fastening to said carrier head base, said base surface being oriented perpendicularly to the movement direction of said carrier head base, and said fastening surface being oriented substantially in parallel to a pivot axis of said spindle carrier head.

26. A machine tool comprising a machining unit according to claim 1.