Method for producing a water-hydraulic machine

Patent metadata

Field	Value
Publication number	US-12584470-B2
Application number	US-202017030497-A
Country	US
Kind code	B2
Filing date	Sep 24, 2020
Priority date	Sep 25, 2019
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

Abstract

A method for producing a water-hydraulic machine having a first member ( 1 ) and a second member ( 2 ) in sliding contact with a contact surface ( 3 ) of the first member ( 1 ), wherein the second member ( 2 ) comprises a surface made of a friction reducing plastic material and the contact surface ( 3 ) is a metallic surface, is disclosed. The machine should have a low risk of damages. To this end, the method includes the steps of using a first member ( 1 ) comprising a first part ( 4 ) having the contact surface ( 3 ) and a second part ( 5 ), using a high temperature hardening process at a temperature of at least 1000° C. to give a deep surface hardening of the contact surface ( 3 ) of the first part ( 4 ), machining of the first part ( 4 ) to the desired geometry, assembling the first part ( 4 ) and the second part ( 5 ) to form the first member.

First claim

What is claimed is:

1 . A method for producing a water-hydraulic machine, the method comprising the steps of:
providing a first part having a contact surface and a second part, using a high temperature hardening process at a temperature of at least 1000° C. to give a deep surface hardening of the contact surface of the first part, machining of the first part to a desired geometry, assembling the first part and the second part to form a first member, providing a second member in sliding contact with the contact surface of the first member, thereby forming the water-hydraulic machine, wherein the second member comprises a surface made of a friction reducing plastic material and the contact surface is a metallic surface.

2 . The method according to claim 1 , wherein the high temperature hardening process is carried out in a presence of nitrogen.

3 . The method according to claim 2 , wherein a low temperature hardening process at a temperature of 550° C. or lower is used to give a final super hard contact surface of the first part.

4 . The method according to claim 2 , wherein at least the contact surface is polished.

5 . The method according to claim 2 , wherein the first part is chosen to have a smaller thickness than the second part.

6 . The method according to claim 2 , wherein the first part is chosen to be symmetric with respect to an axis located in the contact surface.

7 . The method according to claim 1 , wherein after the machining of the first part to the desired geometry, a low temperature hardening process at a temperature of 550° C. or lower is used to give a final super hard contact surface of the first part.

8 . The method according to claim 7 , wherein at least the contact surface is polished.

9 . The method according to claim 7 , wherein the first part is chosen to have a smaller thickness than the second part.

10 . The method according to claim 7 , wherein the first part is chosen to be symmetric with respect to an axis located in the contact surface.

11 . The method according to claim 1 , wherein at least the contact surface is polished.

12 . The method according to claim 11 , wherein the first part is chosen to have a smaller thickness than the second part.

13 . The method according to claim 11 , wherein the first part is chosen to be symmetric with respect to an axis located in the contact surface.

14 . The method according to claim 1 , wherein the first part is chosen to have a smaller thickness than the second part.

15 . The method according to claim 14 , wherein the thickness of the first part is equal to or smaller than 10 mm.

16 . The method according to claim 1 , wherein the first part is chosen to be symmetric with respect to an axis located in the contact surface.

17 . The method according to claim 16 , wherein the first part is chosen to be symmetric with respect to a second axis located in the contact surface and being orthogonal to the first axis.

18 . The method according to claim 1 , wherein the first part is chosen to be of stainless steel.

19 . The method according to claim 18 , wherein the first part is chosen to be duplex steel or super duplex steel or 316 steel.

20 . The method according to claim 1 , wherein the machining of the first part occurs after using the high temperature hardening process, and wherein the machining of the first part comprises removing some of the hardened contact surface.

Assignees

• Danfoss As

Inventors

• Enevoldsen Georg
• Andersen Stig Kildegaard
• Iversen Frank Holm

Classifications

• Y10T29/49236

  Fluid pump or compressor making · CPC title

• B23P15/00

  Making specific metal objects by operations not covered by a single other subclass or a group in this subclass · CPC title

• F05C2253/24

  Heat treatment · CPC title

• F05C2201/046

  Stainless steel or inox, e.g. 18-8 · CPC title

• F05C2251/10

  Hardness · CPC title