	US 12,226,844 B2
	Methods and device for producing a thread, comprising a gear unit
Peter Liebald, Hilpolstein (DE); Dietmar Hechtle, Pegnitz (DE); and Thomas Funk, Pegnitz (DE)
Assigned to EMUGE-WERK RICHARD GLIMPEL GMBH & CO. KG FABRIK FUR PRAZISIONSWERKZEUGE, Lauf a.d. Pegnitz (DE)
Appl. No. 17/642,574
Filed by EMUGE-WERK RICHARD GLIMPEL GMBH & CO. KG FABRIK FUR PRAZISIONSWERKZEUGE, Lauf a.d. Pegnitz (DE)
PCT Filed Sep. 11, 2020, PCT No. PCT/EP2020/075523 § 371(c)(1), (2) Date Mar. 11, 2022, PCT Pub. No. WO2021/048389, PCT Pub. Date Mar. 18, 2021.
Claims priority of application No. 102019124707.1 (DE), filed on Sep. 13, 2019.
Prior Publication US 2022/0324044 A1, Oct. 13, 2022
Int. Cl. B23G 5/20 (2006.01); B23G 1/16 (2006.01)

CPC B23G 5/20 (2013.01) [B23G 1/16 (2013.01); B23G 2240/36 (2013.01); Y10T 408/03 (2015.01); Y10T 408/9048 (2015.01)]

20 Claims

1. A method for producing a thread with a predetermined thread pitch in a workpiece, wherein:

a) a tool is used to produce the thread,

a1) the tool comprises at least one threading region,

a2) the threading region runs around a tool axis extending through the tool with the predetermined thread pitch and a predetermined handedness of the thread to be produced,

b) the tool is moved into the workpiece in a working movement during a first working phase,

b1) the working movement of the tool comprises a rotational movement with a predetermined direction of rotation about the tool axis and further comprises an axial feed movement of the tool, in an axial forward direction axially with respect to the tool axis, the axial feed movement of the tool being synchronized with the rotational movement in accordance with the thread pitch of the threading region, in such a way that one complete revolution of the tool about the tool axis corresponds to an axial feed of the tool by the predetermined thread pitch,

b2) the threading region produces thread turns, running at the predetermined thread pitch, in the workpiece during the first working phase,

c) the tool is moved further into the workpiece as far as a reversal point in a deceleration movement during a second working phase following the first working phase,

c1) the axial feed of the tool, relative to one complete revolution at least during a part of the deceleration movement and, is smaller in amount than the thread pitch and is zero at the reversal point, and

c2) the threading region of the tool produces at least one peripheral groove in the workpiece during the deceleration movement,

d) during the working movement, a rotational speed of the rotational movement of the tool over time extends over a first plateau during which the rotational speed remains constant at a predetermined maximum rotational speed (n_max), and

e) during the deceleration movement, an actual rotational speed of the rotational movement of the tool over time extends over a second plateau during which the rotational speed remains constant at the same predetermined maximum rotational speed (n_max), and

f) the predetermined maximum rotational speed of the rotational movement of the tool is chosen to be at least large enough that a tool path feed rate at the threading region of at least 57 m/min is obtained, which for a thread diameter of 6 mm corresponds to a maximum rotational speed of at least 3000 rpm.