Plasma electrolytic polished diesel engine components

Patent metadata

Field	Value
Publication number	US-11982011-B2
Application number	US-201817053967-A
Country	US
Kind code	B2
Filing date	Nov 30, 2018
Priority date	May 22, 2018
Publication date	May 14, 2024
Grant date	May 14, 2024

Abstract

A method and system is provided for reducing surface roughness of a diesel engine component. The method and system may apply a voltage to a plasma electrolyte polishing cell. The plasma electrolyte polishing cell may include a diesel engine component and an aqueous electrolyte solution. The method and system may cause a plasma layer to form around a surface of the diesel engine component as a result of applying the voltage to the plasma electrolyte polishing cell. The method and system may terminate the voltage to the plasma electrolyte polishing cell. The method and system may apply a coating process to the diesel engine component.

First claim

What is claimed is:

1. A method for reducing surface roughness of a diesel engine component, comprising:
applying a voltage to a plasma electrolyte polishing cell provided in a plasma electrolyte polishing system, wherein the plasma electrolyte polishing cell includes the diesel engine component and an aqueous electrolytic solution;
monitoring a concentration of electrolytes within the aqueous electrolytic solution and a temperature of the aqueous electrolytic solution to transfer the aqueous electrolyte solution from the plasma electrolyte polishing cell through the plasma electrolyte polishing system;
controlling transfer of the aqueous electrolytic solution from the plasma electrolyte polishing cell through the plasma electrolyte polishing system in response to the concentration of electrolytes within the aqueous electrolytic solution and the temperature of the aqueous electrolytic solution;
causing a plasma layer to form around a surface of the diesel engine component as a result of applying the voltage to the plasma electrolyte polishing cell;
terminating the voltage to the plasma electrolyte polishing cell; and
after causing the plasma layer to form around the surface of the diesel engine component, applying a coating process to the diesel engine component.

2. The method of claim 1 , wherein the diesel engine component is at least one of a high-pressure fuel injector component, a valve seat, and an injector nozzle.

3. The method of claim 2 , wherein the diesel engine component is the injector nozzle, and wherein the applying the voltage to the plasma electrolyte polishing cell causes the injector nozzle to be cleaned.

4. The method of claim 1 , wherein the applying the voltage to the plasma electrolyte polishing cell comprises applying the voltage for a predetermined period of time.

5. The method of claim 1 , further comprising:
receiving, from a user interface, user input indicating a period of time to apply the voltage to the plasma electrolyte polishing cell, and
wherein the applying the voltage to the plasma electrolyte polishing cell comprises applying the voltage for the period of time indicated by the user input.

6. The method of claim 1 , wherein the applying the coating process to the diesel engine component causes the surface of the diesel engine component to achieve a physical vapor deposition (PVD) coating finish.

7. The method of claim 1 , wherein the applying the coating process to the diesel engine component causes the surface of the diesel engine component to achieve a plasma enhanced chemical vapor deposition (PECVD) coating finish.

8. The method of claim 1 , wherein, as a result of the method, the diesel engine component has a surface roughness that is less than or equal to one, and wherein the surface roughness includes at least one of a ten-point mean roughness (Rz) and an arithmetical mean roughness (Ra).

9. The method of claim 1 , wherein aqueous electrolyte solution is devoid of acidic chemicals and facilitates producing one or more substantially defect-free surfaces for the diesel engine component.

10. The method of claim 1 , further comprising at least one of:
monitoring a concentration of electrolytes within the aqueous electrolytic solution to form properties suitable to form a desired layer of plasma and
monitoring a temperature of the aqueous electrolytic solution to form properties suitable to form a desired layer of plasma.

11. The method of claim 10 , wherein the monitoring the temperature of the aqueous electrolytic solution to form properties suitable to form desired layer of plasma includes ensuring that the aqueous electrolytic solution does not violate a temperature threshold.

12. The method of claim 11 , wherein the temperature threshold includes at least one of not to fall below 20 degrees Celsius and not to exceed 90 degrees Celsius.

13. The method of claim 11 , further comprising at least one of:
adjusting the temperature of the aqueous electrolytic solution in response to the temperature threshold being violated, and
adjusting the concentration of the electrolytes within the aqueous electrolytic solution.

14. The method of claim 1 , wherein the controlling transfer of the aqueous electrolyte solution from the plasma electrolyte polishing cell through the plasma electrolyte polishing system includes at least one of a strainer and a heat exchanger.

15. The method of claim 1 , wherein terminating the voltage to the plasma electrolyte polishing cell after a predetermined time is in response to a desired surface of the diesel engine component.

16. A system for reducing surface roughness of a diesel engine component, comprising:
a plasma electrolyte polishing system comprising:
a plasma electrolyte polishing cell;
the diesel engine component, wherein the diesel engine component is submersed within the plasma electrolyte polishing cell, and wherein the plasma electrolyte polishing cell comprises an aqueous electrolytic solution;
a controller operatively coupled to the plasma electrolyte polishing cell, wherein the controller is configured to:
monitor a concentration of electrolytes within the aqueous electrolytic solution and a temperature of the aqueous electrolytic solution to transfer the aqueous electrolytic solution from the plasma electrolyte polishing cell through the plasma electrolyte polishing system;
control transfer of the aqueous electrolytic solution from the plasma electrolyte polishing cell through the plasma electrolyte polishing system in response to a concentration of electrolytes of the aqueous electrolytic solution and a temperature of the aqueous electrolytic solution;
apply a voltage to the plasma electrolyte polishing cell, thereby causing a plasma layer to form around a surface of the diesel engine component; and
terminate the voltage to the plasma electrolyte polishing cell; and
a coating system configured to apply a coating process to the diesel engine component.

17. The system of claim 16 , wherein the diesel engine component is at least one of a high-pressure fuel injector component, a valve seat; and an injector nozzle.

18. The system of claim 17 , wherein the diesel engine component is the injector nozzle, and wherein the controller is configured to applying the voltage to the plasma electrolyte polishing cell to cause the injector nozzle to be cleaned.

19. The system of claim 16 , wherein the controller is configured to apply the voltage for a pre-determined period of time, and wherein the plasma layer is formed around the surface of the diesel engine component based on the pre-determined period of time.

20. The system of claim 16 , wherein the controller is configured to:
receive a user input indicating a period of time to apply the voltage, and
wherein the controller is configured to apply the voltage to the plasma electrolyte polishing cell based on the period of time indicated by the user input.

21. The system of claim 16 , wherein the coating system is a physical vapor deposition (PVD) system, wherein the PVD system applies the coating process to the diesel engine component to cause the surface of the diesel engine component to achieve a PVD coating finish.

22. The system of claim 16 , wherein the coating system is a plasma enhanced chemical vapor deposition (PECVD) system, wherein the PECVD system applies the coating process to the diesel engine component to cause the surface of the diesel engine component to achieve a PECVD coating finish.

Assignees

• Cummins Inc

Inventors

• Thete Manoj M
• Edwards Romaine O

Classifications

• C25F3/16 Primary

  Polishing · CPC title

• C23C14/028

  Physical treatment to alter the texture of the substrate surface, e.g. grinding, polishing · CPC title

• C23C16/0254

  Physical treatment to alter the texture of the surface, e.g. scratching or polishing · CPC title

• C23C16/50

  using electric discharges {(generation and control of plasma in discharge tubes for surface treatment H01J37/32, H01J37/34)} · CPC title

• C25F7/00

  Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects (for both electrolytic coating and removal C25D); Servicing or operating · CPC title