Method for producing a sintered part with high radial precision, and set of parts comprising joining parts to be sintered

Patent metadata

Field	Value
Publication number	US-10413967-B2
Application number	US-201415023960-A
Country	US
Kind code	B2
Filing date	Sep 19, 2014
Priority date	Sep 23, 2013
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

The invention relates to a method for producing a sintered part with a high radial precision. The sintered part is made of at least one first joining part to be sintered and a second joining part to be sintered, and the method has at least the following steps: joining the first joining part with the second joining part, and bringing about the high radial precision, having a step of deforming at least one radial deformation element which is preferably positioned so as to adjoin a joint contact zone, wherein the deformation of the radial deformation element is caused at least by means of a calibration tool and is carried out at least substantially as a plastic deformation of the radial deformation element. The invention further relates to a set of parts for joining the joining parts to be sintered into a sintered part with a high radial precision.

First claim

The invention claimed is:

1. A method for producing a sintered part with highly accurate radial precision, wherein the sintered part is produced from at least a first sintered joining part and a second sintered joining part, the method comprising at least the following steps:
joining the first sintered joining part with the second sintered joining part,
imparting the highly accurate radial precision, having a step of deforming at least one radial deformation element, wherein the deformation of the radial deformation element is effected at least by way of a calibration tool and takes place at least substantially as a plastic deformation of the radial deformation element,
wherein an outer deformation part is, during the course of the joining process, positioned so as to at least partially encircle at least the first sintered joining part and the outer deformation part forms a radial deformation element in the form of an outer radial deformation element.

2. The method as claimed in claim 1 , wherein an inner deformation part is, during the course of the joining process, positioned
so as to at least partially cover at least a first inner joining surface of the first sintered joining part and/or
so as to at least partially cover at least a second inner joining surface of the second sintered joining part,
and the inner deformation part forms a radial deformation element in the form of an inner radial deformation element.

3. The method as claimed in claim 1 , wherein the outer deformation part is, during the joining process, connected in at least one of frictionally engaging, positively locking, non-positively locking and cohesive fashion to at least one of the sintered joining parts, and/or wherein the outer deformation part is, during the imparting of the highly accurate radial precision, connected in at least one of frictionally engaging, positively locking, non-positively locking and cohesive fashion to at least one of the sintered joining parts.

4. The method as claimed in claim 1 , wherein the imparting of the highly accurate radial precision is performed at least partially at the same time as the joining of the first sintered joining part and of the second sintered joining part.

5. The method as claimed in claim 1 , wherein
for the joining, at least one first process step is performed by way of at least one joining tool, and/or,
for the imparting of the highly accurate radial precision, at least one second process step is performed by way of a calibration tool in the form of a separate calibration tool and/or by way of a calibration tool in the form of a calibration region of a progressive tool.

6. The method as claimed in claim 1 , wherein after the imparting of the highly accurate radial precision, the sintered part is removed from the calibration tool as a sintered part with highly accurate radial precision.

7. The method as claimed in claim 1 , wherein for the production of the sintered part, a first joining surface of the first sintered joining part and a second joining surface of the second sintered joining part are pressed against one another under the action of an axial pressing force exerted by way of a pressing tool, wherein
the first sintered joining part has at least one first deformation element arranged on the first joining surface and/or the second sintered joining part has at least one second deformation element arranged on the second joining surface, and a deformation of at least one of the deformation elements is effected by way of the pressing against one another.

8. The method as claimed in claim 1 , wherein the at least one radial deformation element is positioned adjacent to a joining contact zone.

9. The method as claimed in claim 1 , wherein at least 75% of a change in total volume of the sintered parts and the at least one radial deformation element by way of the deforming is realized as a change in volume of the at least one radial deformation element.

10. A method for producing a sintered part with highly accurate radial precision, wherein the sintered part is produced from at least a first sintered joining part and a second sintered joining part, the method comprising at least the following steps:
joining the first sintered joining part with the second sintered joining part,
imparting the highly accurate radial precision, having a step of deforming at least one radial deformation element, wherein the deformation of the radial deformation element is effected at least by way of a calibration tool and takes place at least substantially as a plastic deformation of the radial deformation element,
wherein at least one region of at least one inner joining surface of the first sintered joining part has at least one radial elevation which forms a radial deformation element in the form of an inner radial deformation element.

Assignees

• Gkn Sinter Metals Engineering Gmbh

Inventors

• Tausend Alexander
• Ziegler Kerstin

Classifications

• B22F5/10

  of articles with cavities or holes, not otherwise provided for in the preceding subgroups · CPC title

• B22F5/08 Primary

  of toothed articles, e.g. gear wheels; of cam discs · CPC title

• B22F7/062

  involving the connection or repairing of preformed parts · CPC title

• B21K1/06

  axles or shafts · CPC title

• B21K31/00

  Control devices specially adapted for positioning tool carriers · CPC title