Method for producing a sintered component with a toothing

Patent metadata

Field	Value
Publication number	US-12013022-B2
Application number	US-202217740558-A
Country	US
Kind code	B2
Filing date	May 10, 2022
Priority date	Jun 8, 2021
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

A method for producing a sintered component, in particular an annular sintered component, with a toothing, having teeth with tooth roots, tooth tips and tooth flanks, includes the steps of pressing a powder to form a green compact, sintering the green compact, and hardening the sintered component, wherein after sintering, the tooth flanks and possibly the tooth tips are post-compacted and subsequently undergo post-processing by machining, and wherein a transition region between the tooth flanks and the tooth roots has an undercut design, and post-compaction of the tooth flanks is carried out only up to this transition region.

First claim

What is claimed is:

1. A method for producing a sintered component, with a toothing, having teeth with tooth roots, tooth tips and tooth flanks, comprising the steps of
pressing a powder to form a green compact,
sintering the green compact, and
hardening the sintered component once the green compact has been sintered,
wherein after sintering, the tooth flanks are post-compacted and subsequently undergo post-processing by machining,
wherein a transition region between the tooth flanks and the tooth roots has an undercut design, and
wherein post-compaction of the tooth flanks is carried out only up to the transition region.

2. The method according to claim 1 , wherein post-compaction is carried out only up to a region separate from the transition region and defined by the usable root diameter plus 10% of the usable root diameter.

3. The method according to claim 1 , wherein the tooth roots are produced without an excess of material during the pressing of the powder.

4. The method according to claim 1 , wherein the post-processing by machining of the tooth flanks is carried out maximally up to a region, the radius of which deviates from the tooth root circle radius by 0.08% to 12%.

5. The method according to claim 1 , wherein the powder has the following composition:
0.1 wt. % to 5 wt. % chromium
0.1 wt. % to 0.8 wt. % carbon
0 wt. % to 2 wt. % molybdenum
0 wt. % to 2 wt. % nickel
remainder iron.

6. The method according to claim 1 , wherein the tooth roots are formed in a rounded manner, wherein a fillet radius is selected from a range between 0.2 mm and 8 mm.

7. The method according to claim 1 , wherein hardening is carried out by plasma nitriding or plasma nitrocarburizing.

8. The method according to claim 1 , wherein the toothing is produced with a module from a range of 0.3 mm to 3 mm.

9. The method according to claim 1 , wherein the sintered component is produced as an internal gear.

10. A sintered component produced by the method according to claim 1 , the sintered component comprising a toothing having teeth with tooth roots, tooth tips and tooth flanks, wherein the tooth flanks are post-compacted and subsequently undergo post-processing by machining, wherein a transition region between the tooth flanks and the tooth roots has an undercut design, and wherein post-compaction of the tooth flanks is carried out only up to the transition region.

11. The method according to claim 1 , wherein after sintering, the tooth tips are post-compacted.

Assignees

• Miba Sinter Austria Gmbh

Inventors

• Roessler Horst
• Ohler Martin
• Aichinger Helmut
• Mueller Alexander

Classifications

• F16H2055/176

  Ring gears with inner teeth · CPC title

• F16H55/08

  Profiling · CPC title

• F16H55/06

  Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties · CPC title

• C23C8/38

  Treatment of ferrous surfaces · CPC title

• C23C8/32

  of ferrous surfaces · CPC title