Method for producing a calibrated combination of parts

Patent metadata

Field	Value
Publication number	US-12472557-B2
Application number	US-202017770939-A
Country	US
Kind code	B2
Filing date	Oct 19, 2020
Priority date	Oct 21, 2019
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A calibrated combination of parts are produced according to a method. The combination of parts includes at least one first part with a first contact surface and a second part with a second contact surface. The parts contact each other via the contact surfaces in the combination of parts. The parts are designed to be free of an undercut at least with respect to an axial direction and can be moved relative to each other along the axial direction and thereby along the contact surfaces in the calibrated combination of parts. The method has at least the following steps: a) providing the parts in the form of green bodies, b) sintering the parts and at least forming bonded connections between the parts; c) arranging the combination of parts in a calibrating tool; d) moving the parts relative to each other; e) arranging the parts in order to form the combination of parts; and f) calibrating the combination of parts.

First claim

The invention claimed is:

1 . A method for producing a calibrated parts assembly, wherein the parts assembly comprises at least a first part having a first contact surface and a second part having a second contact surface, wherein, in the parts assembly, the parts contact one another via the contact surfaces; wherein the parts are embodied in an undercut-free manner at least in relation to an axial direction and, in the calibrated parts assembly, are displaceable relative to one another along the axial direction and along the contact surfaces; wherein the method comprises at least the following steps:
a) providing the first part and the second part in each case in the form of a green body, wherein a green body is produced from a pulverulent material by pressing; b) sintering the parts and at least forming materially bonded connections between the parts via the contact surfaces; c) arranging the parts assembly in a calibration tool; d) displacing the parts relative to one another along the axial direction in the calibration tool; e) arranging the parts, in order to form the parts assembly, with mutually contacting contact surfaces in the calibration tool, and f) calibrating the parts assembly by pressing and providing the calibrated parts assembly.

2 . The method as claimed in claim 1 , wherein prior to step a), in a step a0), in a common operation and in a common pressing tool, the parts are pressed from the pulverulent material to form a first green body and a second green body and are joined to one another in order to form the parts assembly, such that the parts contact one another via the contact surfaces; wherein the parts are provided in the form of a parts assembly in step a).

3 . The method as claimed in claim 2 , wherein, to form the respective green body, the first part is pressed in a first working space of the pressing tool and the second part is pressed in a second working space of the pressing tool; wherein at least one green body is displaced relative to the respectively other working space, along the axial direction, in order to form the parts assembly.

4 . The method as claimed in claim 3 , wherein both parts are present in the form of green bodies prior to the displacement for forming the parts assembly.

5 . The method as claimed in claim 3 , wherein the working spaces are arranged offset from one another along the axial direction, such that the parts do not contact one another during the pressing of at least the one part to form a green body.

6 . The method as claimed in claim 2 , wherein the green bodies are joined to one another in step a0) so as to form a press fit or a transition fit.

7 . The method as claimed in claim 2 , wherein, after the parts assembly has been formed in step a0), the parts are provided in the form of a parts assembly in step a) and are sintered in the form of a parts assembly in step b).

8 . The method as claimed in claim 1 , wherein the first part and the second part are produced from an identical pulverulent material.

9 . A parts assembly, produced by a method as claimed in claim 1 , wherein the calibrated parts assembly comprises at least a first part having a first contact surface and a second part having a second contact surface, wherein, in the parts assembly, the parts contact one another via the contact surfaces; wherein the parts are embodied in an undercut-free manner at least in relation to an axial direction and, in the calibrated parts assembly, are displaceable relative to one another at least along the axial direction and along the contact surfaces.

10 . The parts assembly as claimed in claim 9 , wherein, in order to produce the parts assembly, the parts are moved relative to one another exclusively along the axial direction.

11 . The parts assembly as claimed in claim 9 , wherein, in order to separate the parts assembly, the parts are moveable relative to one another exclusively along the axial direction.

12 . The parts assembly as claimed in claim 9 , wherein the parts assembly is ring-shaped, wherein each part forms a ring segment which extends along a circumferential direction.

13 . The parts assembly as claimed in claim 9 , wherein the parts are identical to one another in terms of their geometrical design.

Assignees

• Gkn Sinter Metals Engineering Gmbh

Inventors

• Schmitt Rainer
• Siebenmorgen Sebastian
• Schüller Niklas
• Tekines Hasim

Classifications

• B30B15/026

  Mounting of dies, platens or press rams · CPC title

• B30B15/022

  Moulds for compacting material in powder, granular of pasta form · CPC title

• B22F5/106

  Tube or ring forms · CPC title

• B22F3/164 Primary

  Partial deformation or calibration · CPC title

• B22F2003/033

  with multiple punches working in the same direction · CPC title