Machine tool for processing workpieces

Patent metadata

Field	Value
Publication number	US-9561533-B2
Application number	US-201314088757-A
Country	US
Kind code	B2
Filing date	Nov 25, 2013
Priority date	May 26, 2011
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A machine tool for processing workpieces comprises a stroke drive device with a pressing tool, with a motorized drive including two motorized drive units which are controlled independently and wedge gear elements between the motorized drive and the pressing tool. The wedge gear elements comprise two drive-side wedge gear elements, each one being associated with a motorized drive unit, and two output-side wedge gear elements attached to the pressing tool, with each output-side wedge gear element opposite to an associated respective drive-side wedge gear element and forming a gear element pair. The wedge gear elements of each gear element pair are opposite each other inclined at a wedge angle with respect to a positioning axis and inclined in opposing directions with respect to the positioning axis. The motorized drive is configured to move the pressing tool along a stroke axis and position the stroke drive device along the positioning axis.

First claim

The invention claimed is:

1. A machine tool for processing workpieces comprising:
a stroke drive device configured to move a pressing tool along a stroke axis towards a workpiece and being positionable along a positioning axis which extends perpendicular to the stroke axis;
a motorized drive including two motorized drive units which are controlled independently of each other; and
wedge gear elements between the motorized drive and the pressing tool, the wedge gear elements comprising:
two drive-side wedge gear elements, each drive-side wedge gear element being associated with a motorized drive unit,
two output-side wedge gear elements attached to the pressing tool, each output-side wedge gear element being opposite to an associated respective drive-side wedge gear element and forming together with the associated drive-side wedge gear element a gear element pair, thus forming two gear element pairs,

wherein the drive-side wedge gear element and the output-side wedge gear element of each of the two gear element pairs are opposite each other at wedge faces inclined at a wedge angle with respect to the positioning axis,
wherein the wedge faces of the two gear element pairs are inclined in opposing directions with respect to the positioning axis, and
wherein the motorized drive units are configured to a) move the drive-side wedge gear element of at least one of the two gear element pairs relative to its associated output-side wedge gear element along the positioning axis in order to move the pressing tool along the stroke axis, and b) position the stroke drive device including the two gear element pairs along the positioning axis by moving both gear element pairs including the drive-side wedge gear elements and the associated respective output-side wedge gear elements simultaneously in the same direction along the positioning axis of the stroke drive device.

2. The machine tool of claim 1 , wherein the motorized drive units are configured to simultaneously move the drive-side wedge gear element of at least one of the two gear element pairs relative to its associated output-side wedge gear element along the positioning axis and both gear element pairs including the drive-side wedge gear elements and the associated output-side wedge gear elements simultaneously in the same direction along the positioning axis of the stroke drive device.

3. The machine tool of claim 1 , wherein the motorized drive units are configured to simultaneously move the drive-side wedge gear elements of both gear element pairs relative to the associated output-side wedge gear element along the positioning axis in order to move the pressing tool along the stroke axis.

4. The machine tool of claim 1 , wherein the motorized drive units are configured to move the drive-side wedge gear elements relative to the associated output-side wedge gear elements along the positioning axis in order to move the pressing tool in the stroke direction and/or carry the output-side wedge gear elements along the positioning axis to position the stroke drive device along the positioning axis.

5. The machine tool of claim 1 , wherein one of the motorized drive units is configured to move the drive-side wedge gear element of the at least one of the two gear element pairs relative to its associated output-side wedge gear element along the positioning axis in order to move the pressing tool along the stroke axis, while the other of the motorized drive units is configured to move both gear element pairs including the drive-side wedge gear elements and the respective associated output-side wedge gear elements simultaneously in the same direction along the positioning axis of the stroke drive device in order to position the stroke drive device along the positioning axis, resulting in a move of the pressing tool along the stroke axis and along the positioning axis.

6. The machine tool of claim 1 , wherein the drive-side wedge gear element of a first of the gear element pairs has two gear element portions separated by an intermediate space and which are offset relative to each other perpendicular to a movement plane defined by the stroke axis and the positioning axis, and which are opposite the associated output-side wedge gear element on the respective wedge face.

7. The machine tool of claim 6 , wherein the drive-side wedge gear element of a second of the gear element pairs is arranged at the intermediate space of the drive-side wedge gear element of the first gear element pair, and wherein during a movement of one or both of the drive-side wedge gear elements along the positioning axis, the drive-side wedge gear element of the second gear element pair is received in the intermediate space of the drive-side wedge gear element of the first gear element pair.

8. The machine tool of claim 6 , wherein the drive-side wedge gear element of the first gear element pair is U-shaped with two legs which form the gear element portions and are orientated parallel with the movement plane.

9. The machine tool of claim 1 , wherein the output-side wedge gear elements are connected to a ram which is movably guided along the stroke axis and which moves the pressing tool along the stroke axis.

10. The machine tool of claim 9 , wherein the output-side wedge gear elements attached to the ram guide the ram along the stroke axis.

11. The machine tool of claim 9 , wherein the ram has a tool receiving member for the pressing tool and a rotary drive device by which the tool receiving member can be rotated about the stroke axis.

12. The machine tool of claim 1 , wherein the motorized drive units each have a gear-side drive device which is moved together with one of the drive-side wedge gear elements along the positioning axis and wherein the gear-side drive devices cooperate with a carrier-structure-side drive device which is attached to a carrier structure of the machine tool and which is common to the two motorized drive units.

13. The machine tool of claim 1 , wherein at least one of the motorized drive units comprises a spindle drive.

14. The machine tool of claim 12 , wherein the motorized drive units each comprise a spindle drive, wherein each of the spindle drives comprises a spindle nut of a gear-side drive device and wherein the spindle drives comprise a common drive spindle of a carrier-structure-side drive device which extends along the positioning axis of the stroke drive device and on which the spindle nuts of the spindle drives are positioned.

15. The machine tool of claim 14 , wherein at least one of the spindle drives comprises a drive motor which drives the associated spindle nut along the drive spindle.

16. The machine of claim 15 , wherein the drive motor of the at least one of the spindle drives is, together with the associated spindle nut, included in the gear-side drive device.

17. The machine tool of claim 1 , wherein at least one of the motorized drive units is a linear motor.

18. The machine tool of claim 17 , wherein the linear motor has as a gear-side drive device, a primary part, and a common carrier-structure-side drive device in the form of a common secondary part which extends along the positioning axis of the stroke drive device.

19. The machine tool of claim 1 , wherein the machine tool has a carrier structure in the form of an O-shaped machine frame which encloses an inner frame space and wherein the stroke drive device is arranged in the inner frame space and is guided on the O-shaped machine frame to be positioned along the positioning axis which extends in the peripheral direction of the O-shaped mach

Assignees

• Trumpf Werkzeugmaschinen Gmbh Co Kg

Inventors

• Schmauder Frank
• Wruck Jochen
• Breitling Detlef

Classifications

• B21D28/002 Primary

  Drive of the tools (B21D28/007 and B21D28/20 take precedence) · CPC title

• B30B1/40 Primary

  by wedge means · CPC title

• Y10T83/8841

  Tool driver movable relative to tool support · CPC title

• B21D28/20 Primary

  Applications of drives {for reducing noise or wear} · CPC title

• B21D28/02

  Punching blanks or articles with or without obtaining scrap (cutting nails or pins from strips or sheet material B21G3/26); Notching · CPC title