THREAD FORMER HAVING FLARING RIDGES

• US 20200130082A1
• Filed: 10/29/2019
• Published: 04/30/2020
• Est. Priority Date: 10/29/2018
• Status: Active Grant

• Current Assignee: Emuge-Werk Richard Glimpel GmbH & Company KG Fabrik FüR Prã¤Zisionswerkzeuge (KMV Verwaltungs GmbH)
• Original Assignee: Emuge-Werk Richard Glimpel GmbH & Company KG Fabrik FüR Prã¤Zisionswerkzeuge (KMV Verwaltungs GmbH)
• Inventors: Glimpel, Helmut, Fenzel, Jurgen
• Granted Patent: US 11,229,966 B2
• Time in Patent Office: Days
• CPC Class Codes: B23G 7/02 Tools for this purpose

Abstract

A tool and related method for the non-cutting production or reworking of a thread in/on a workpiece comprises a forming area which is rotatable about a tool axis (A), the forming area having a plurality of pressing lobes protruding or projecting radially outwards away from the tool axis (A) for producing or post-reworking the thread by pressing the pressing lobes into the workpiece surface. The pressing lobes are arranged in succession along a shaping curve which substantially spirally encircles the tool axis (A), and the pitch of the shaping curve corresponds substantially to the pitch of the thread to be produced or reworked. The pressing lobes form at least one pressing ridge, wherein adjacent to the at least one pressing ridge a flaring ridge with a lower height H_B than the height of the pressing ridge H_D is formed.

Claims

1. A tool for the non-cutting production or reworking of a thread in or on a workpiece, in particular a cold-forming tap or thread former, comprising:

at least one forming area which is rotatable or rotates about a tool axis (A) for the non-cutting production or reworking of the thread, in particular an internal thread;

wherein;

the forming area has a plurality of pressing lobes protruding or projecting radially outwards away from the tool axis (A) for producing or reworking the thread by pressing the pressing lobes into the workpiece surface;

the pressing lobes being arranged in succession along a shaping curve which substantially spirally encircles the tool axis (A);

the pitch of the shaping curve corresponds substantially to the pitch of the thread to be produced or reworked; and

the pressing lobes form at least one pressing ridge;

wherein, adjacent to the at least one pressing ridge, a flaring ridge with a lower height H_B than the height of the pressing ridge H_D is formed.

2. The tool according to claim 1, wherein:

the pressing lobes are arranged in at least two pressing ridges; and

the tool has at least two flaring ridges, which are each arranged between two pressing ridges.

3. The tool according to claim 1, wherein the flaring ridge has a height H_B which lies between half a core diameter of the tool H_K and the height of the pressing ridge H_D.

4. The tool according to claim 1, wherein the at least one pressing ridge and the at least one flaring ridge extend parallel to the tool axis (A).

5. The tool according to claim 1, wherein the at least two flaring ridges are arranged symmetrically with respect to the tool axis (A).

6. The tool according to claim 1, wherein a plurality of pressing ridges is arranged between two flaring ridges.

7. The tool according to claim 1, wherein a pitch angle between a pressing ridge and/or flaring ridge and the following pressing ridge and/or flaring ridge in the circumferential direction is substantially the same.

8. The tool according to claim 1, wherein one or more pressing lobes in one or more pressing ridges are reduced in size or removed.

9. The tool according to claim 1, wherein:

the flaring ridge extends along the entire length of the at least one pressing ridge and/or

the flaring ridge is formed from two or more partial flaring ridges, each partial flaring ridge being arranged on the shaping curve and preferably having a greater length in the direction of the tool axis (A) than the preceding pressing ridge on the shaping curve.

10. A method for producing an internal thread, having the following iteratively repeating steps:

pressing in a thread by means of one or more pressing lobes with a rotating tool, the rotating tool being in particular a tool for the non-cutting production or reworking of a thread in or on a workpiece, in particular a cold-forming tap or thread former, comprising;

at least one forming area which is rotatable or rotates about a tool axis (A) for the non-cutting production or reworking of the thread, in particular an internal thread;

wherein;

the forming area has a plurality of pressing lobes protruding or projecting radially outwards away from the tool axis (A) for producing or reworking the thread by pressing the pressing lobes into the workpiece surface;

the pressing lobes being arranged in succession along a shaping curve which substantially spirally encircles the tool axis (A);

the pitch of the shaping curve corresponds substantially to the pitch of the thread to be produced or reworked; and

the pressing lobes form at least one pressing ridge;

wherein, adjacent to the at least one pressing ridge, a flaring ridge with a lower height H_B than the height of the pressing ridge H_D is formed; and

subsequently forming the interspace between the threads with a flaring ridge.