Multiple stroke slotting of planar workpieces

Patent metadata

Field	Value
Publication number	US-11325176-B2
Application number	US-201916363166-A
Country	US
Kind code	B2
Filing date	Mar 25, 2019
Priority date	Sep 26, 2016
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A method for multiple-stroke slotting of planar workpieces includes positioning a workpiece relative to a slotting tool having a punch and a die, moving the punch and the die relative to one another, moving the slotting tool and the workpiece relative to one another, slotting a workpiece by a slot length during a sectioning slot stroke and at least one subsequent slotting stroke in a sectioning phase, and performing strokes in form of slotting strokes and at least one trimming stroke during the relative movement of the punch and the die in a working phase. The subsequent slotting stroke is performed prior to the trimming stroke, and the slot length exceeds a maximum attainable slot length during the trimming stroke. The workpiece and the slotting tool are moved relative to one another by at least one feed movement between the strokes.

First claim

What is claimed is:

1. A method of multiple-stroke slotting of planar workpieces by a slotting tool, the method comprising:
positioning a workpiece relative to the slotting tool, the workpiece being a planar workpiece, wherein the slotting tool comprises a punch and a die between which the workpiece is positioned for machining,
wherein the punch comprises:
two punch longitudinal cutting edges running in a slot direction and
front and rear punch transverse cutting edges running transversely to the slot direction at longitudinal ends of the punch longitudinal cutting edges and between the punch longitudinal cutting edges,

wherein the punch longitudinal cutting edges of the punch rise up on the punch, relative to the workpiece, in the slot direction, and the front punch transverse cutting edge of the punch is higher than the rear punch transverse cutting edge of the punch, and
wherein the die comprises:
two die longitudinal cutting edges running in the slot direction and
front and rear die transverse cutting edges running transversely to the slot direction at longitudinal ends of the die longitudinal cutting edges and between the die longitudinal cutting edges;

moving the punch and the die relative to one another to achieve a relative movement of the punch and the die;
moving the slotting tool and the workpiece relative to one another in a feed direction;
in a sectioning phase, slotting the workpiece by a slot length during a sectioning slot stroke and at least one subsequent slotting stroke, the sectioning phase comprising:
creating a section on a workpiece edge or at a distance from the workpiece edge during the sectioning slot stroke, and
performing the at least one subsequent slotting stroke after the sectioning slot stroke; and

in a working phase, performing working strokes during the relative movement of the punch and the die, the working strokes comprising working slotting strokes and at least one trimming stroke, the working phase comprising:
during the working slotting strokes, cutting a material strip to be partially free by the punch and the die, the material strip having a connection to a remaining portion of the workpiece located in the slot direction, and
during the at least one trimming stroke, trimming the connection to separate the material strip from the remaining portion of the workpiece by the punch and the die,
wherein, in the working phase, at least one of the punch and the die is controlled in a superposed manner by a working stroke movement along a stroke axis and a further traversing movement along a movement axis, the further traversing movement being different from the working stroke movement,

wherein the at least one subsequent slotting stroke is performed prior to the at least one trimming stroke, and the slot length during the sectioning slot stroke and the at least one subsequent slotting stroke exceeds an attainable slot length during the at least one trimming stroke, and
wherein the workpiece and the slotting tool are moved relative to one another in the feed direction, by at least one feed movement, between the working strokes during the relative movement of the punch and the die.

2. The method of claim 1 , wherein a position of the workpiece relative to at least one of the punch and the die is maintained during the working phase.

3. The method of claim 1 , wherein the working strokes comprise a return working stroke, and the slotting tool is controlled in the return working stroke, and wherein, during the return working stroke, the material strip is cut in one of the working slotting strokes and is separated from the remaining portion of the workpiece in the at least one trimming stroke subsequent to the one of the working slotting strokes.

4. The method of claim 1 , wherein a working stroke of the working strokes within the working phase is divided into a plurality of stroke phases, and the working stroke is controlled in a first stroke phase of the plurality of stroke phases by a single-axis stroke movement in which the punch and the die are moved towards one another, the working stroke being one of the working slotting strokes for cutting the material strip, and
wherein at least one second stroke phase of the plurality of stroke phases is initiated after the material strip has been cut, wherein the further traversing movement is superposed on the working stroke movement in the at least one second stroke phase, and wherein a position axis of the punch and a position axis of the die are changed relative to one another by the further traversing movement.

5. The method of claim 4 , wherein the first stroke phase of the working stroke is ended when the front punch transverse cutting edge of the punch is transferred to a height of the front die transverse cutting edge of the die or is positioned relative to the die to be at a distance from a material thickness of the workpiece.

6. The method of claim 4 , wherein at least one of a traversing movement of the punch and a traversing movement of the die in the second stroke phase of the working stroke is ended when the front punch transverse cutting edge of the punch is located opposite an inner trimming edge in the die that is located deeper than the front die transverse cutting edge of the die, and
wherein the at least one of the traversing movement of the punch and the traversing movement of the die comprises the further traversing movement.

7. The method of claim 4 , wherein a third stroke phase following the second stroke phase of the working stroke is controlled by at least one of a punch stroke movement of the punch and a die stroke movement of the die, such that the material strip is separated from the remaining portion of the workpiece at an inner trimming edge in the die, and
wherein the at least one of the punch stroke movement of the punch and the die stroke movement of the die comprises the working stroke movement along the stroke axis.

8. The method of claim 4 , wherein the sectioning phase comprises a first working stroke, during which the material strip is cut,
wherein the single-axis stroke movement of the punch relative to the die is restricted, such that only part of the punch longitudinal cutting edges of the punch enters an opening of the die, and
wherein the first working stroke is different from the working strokes in the working phase.

9. The method of claim 8 , wherein the plurality of stroke phases of the working stroke in the working phase follow the first working stroke of the sectioning phase.

10. The method of claim 1 , further comprising:
performing an end phase after the working phase has been performed, the end phase comprising:
rotating the slotting tool by 180° about a position axis, while maintaining a position of the workpiece, and
subsequently performing an end stroke, during which a part of the material strip is cut free from a solid material of the workpiece.

Assignees

• Trumpf Werkzeugmaschinen Gmbh Co Kg

Inventors

• Wilhelm Markus
• Hank Rainer
• Klinkhammer Marc
• Schindewolf Leonard
• Ockenfuss Simon
• Kappes Jens
• Traenklein Dennis
• Tatarczyk Alexander
• Neupert Joerg
• Bitto Dominik
• Maatz Markus
• Jakisch Christian

Classifications

• B21D28/34 Primary

  Perforating tools; Die holders · CPC title

• B26F1/14

  Punching tools; Punching dies · CPC title

• B23D27/00

  Machines or devices for cutting by a nibbling action · CPC title

• B21D28/14

  Dies (ejecting or stripping-off devices arranged in punching machines or tools B21D45/00) · CPC title