Method for producing a hollow valve

Patent metadata

Field	Value
Publication number	US-11247284-B2
Application number	US-201515534965-A
Country	US
Kind code	B2
Filing date	Dec 7, 2015
Priority date	Dec 11, 2014
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

A method for producing at least one hollow valve for gas exchange may include introducing a bore into a valve shaft and into a valve head to form the at least one hollow valve, measuring a depth of the bore, washing the at least one hollow valve at least once, providing the at least one hollow valve in a retaining device, orienting the retaining device together with the at least one hollow valve with respect to an associated electrode, moving the associated electrode in relation to the at least one hollow valve, inserting the associated electrode into the bore of the at least one hollow valve, enlarging the bore in a region of the valve head by electromechanical machining processes, removing the associated electrode from the at least one hollow valve, rinsing and/or preserving the at least one hollow valve, and measuring a wall thickness of a valve bottom.

First claim

The invention claimed is:

1. A method comprising:
introducing a bore into a valve shaft and into a valve head to form at least one hollow valve;
measuring a depth of the bore;
washing the at least one hollow valve at least once;
providing the at least one hollow valve in a retaining device;
orienting the retaining device together with the at least one hollow valve with respect to an associated electrode via a gripper that orientates the bore of the at least one hollow valve in relation to an insertion chamfer of the electrode to enable a concentric orientation of a distal end of the insertion chamfer in relation to the bore, the insertion chamfer forming an acute angle with respect to a wall of the electrode;
moving the associated electrode in relation to the at least one hollow valve;
inserting the associated electrode into the bore of the at least one hollow valve;
enlarging the bore in a region of the valve head by electrochemical machining processes;
removing the associated electrode from the at least one hollow valve;
at least one of rinsing and preserving the at least one hollow valve; and
measuring a wall thickness of a valve bottom.

2. The method according to claim 1 , wherein measuring the depth of the bore is performed at least one of in a tactile manner and by one of an ultrasound and a laser.

3. The method according to claim 1 , wherein measuring the wall thickness of the valve bottom is performed at least one of in a tactile manner and by one of an ultrasound and a laser.

4. The method according to claim 1 , wherein the retaining device together with the at least one hollow valve is provided continuously.

5. The method according to claim 1 , wherein the at least one hollow valve is held head first and in a centred manner in a mount of the retaining device constructed in a complementary manner thereto.

6. The method according to claim 1 , further comprising:
mounting at least one of the retaining device together with the at least one hollow valve and the associated electrode in a floating manner; and
fixing the at least one of the floating bearing of the retaining device together with the at least one of hollow valve and the associated electrode.

7. The method according to claim 1 , further comprising:
drying the at least one hollow valve after at least one of rinsing and preserving the at least one hollow valve;
and filling the bore of the at least one hollow valve with coolant after measuring the wall thickness; and
closing the bore.

8. The method according to claim 7 , wherein closing the bore includes placing a shaft end on the at least one hollow valve.

9. The method according to claim 1 , wherein providing the at least one hollow valve includes simultaneously providing at least two hollow valves.

10. The method according to claim 2 , wherein measuring at least one of the bore depth and the wall thickness of the valve bottom is performed in a tactile manner.

11. The method according to claim 2 , wherein the retaining device together with the at least one hollow valve is provided continuously.

12. The method according to claim 3 , wherein the retaining device together with the at least one hollow valve is provided continuously.

13. The method according to claim 2 , wherein the at least one hollow valve is held head first and in a centred manner in a mount of the retaining device constructed in a complementary manner thereto.

14. The method according to claim 2 , further comprising:
mounting at least one of the retaining device together with the at least one hollow valve and the associated electrode in a floating manner; and
fixing the at least one of the floating bearing of the retaining device together with the at least one of hollow valve and the associated electrode.

15. The method according to claim 2 , further comprising:
drying the at least one hollow valve after at least one of rinsing and preserving the at least one hollow valve;
filling the bore of the at least one hollow valve with coolant after measuring the wall thickness; and
closing the bore.

16. The method according to claim 15 , wherein closing the bore includes placing a shaft end on the at least one hollow valve.

17. A method comprising:
introducing a bore into a valve shaft and into a valve head to form at least one hollow valve;
measuring a depth of the bore;
washing the at least one hollow valve at least once;
providing the at least one hollow valve in a retaining device;
orienting the retaining device together with the at least one hollow valve with respect to an associated electrode via a gripper that orientates the bore of the at least one hollow valve in relation to an insertion chamfer of the electrode to enable a concentric orientation of a distal end of the insertion chamfer in relation to the bore, the insertion chamfer forming an acute angle with respect to a wall of the electrode;
moving the associated electrode in relation to the at least one hollow valve;
inserting the associated electrode into the bore of the at least one hollow valve;
enlarging the bore in a region of the valve head by electrochemical machining processes;
removing the associated electrode from the at least one hollow valve;
at least one of rinsing and preserving the at least one hollow valve;
drying the at least one hollow valve after at least one of rinsing and preserving the at least one hollow valve;
measuring a wall thickness of a valve bottom;
filling the bore of the at least one hollow valve with coolant; and
placing a shaft end on the at least one hollow valve to close the bore.

18. The method according to claim 17 , wherein the coolant is sodium.

Assignees

• Mahle Int Gmbh

Inventors

• Kroos Peter
• Luven Christoph

Classifications

• B23H9/14 Primary

  Making holes · CPC title

• F01L3/14 Primary

  by means of a liquid or solid coolant, e.g. sodium, in a closed chamber in a valve · CPC title

• B23H3/00

  Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte · CPC title

• F01L2303/01

  Tools for producing, mounting or adjusting, e.g. some part of the distribution · CPC title

• G01B21/18

  for measuring depth · CPC title