INSIDE-COOLED DISC VALVE AND A SEMI-FINISHED PRODUCT AND METHOD FOR ITS PRODUCTION

Abstract

A method for the production for a semi-finished valve product (4), includes casting, forging, deep-drawing, pressing and/or drop-welding of one or several metal material into a semi-finished valve product (4) that corresponds to a circle segment of a valve cut open in the axial direction. A valve is produced by welding together at least two semi-finished valve products (4) into an internally cooled valve, with the weld running in the axial direction of the valve.

Claims

1. A method for the production of a semi-finished valve product (4), comprising partially folding a sheet, wherein the folded part (8) of the sheet being forge-welded in forging of drop-welding, forging, deep-drawing, pressing and/or drop-forging of said folding over sheet into a semi-finished valve produce (4) that corresponds to a circle segment of a valve cut open in the axial direction; wherein the folded part forming a segment of a valve head (12) after forming.

2. The method for the production of a semi-finished valve product (4) according to claim 1, with the circle segment corresponding to a semi-circle and therefore the semi-finished valve product (4) to a half shell, or with the circle segment at least corresponding to a third-circle and thus the semi-finished valve product (4) at least to a third-shell.

3. A semi-finished valve product (4), in the form of a circle segment of a valve cut open in the axial direction, produced according to one of the method of claim 1.

4. The semi-finished valve product (4) according to claim 3, with the circle segment corresponding to a semi-circle and thus the semi-finished valve product (4) to a half shell, or with the circle segment at least corresponding to a third-circle and thus the semi-finished valve product (4) at least to a third-shell.

5. The method for the production of a valve of at least two semi-finished valve products (4) according to claim 3, with the method comprising provision of at least two semi-finished valve products (4) according to one of claims 3 or 4, and further arrangement of the at least two semi-finished valve products (4) being intended in a valve (2), with the semi-finished valve products (4) surrounding a cavity, followed by welding together of the arranged at least two semi-finished valve products (4) into a valve.

6. A method for the production of a valve of at least two semi-finished valve products (4) wherein said semi-finished valve product (4), are manufactured by a method comprising casting, forging, deep=drawing, pressing and/or drop-forging of one or several metal materials into a semi-finished valve product (4) that corresponds to a circle segment of a valve cut open in the axial direction, said method for the production of a valve of at least two semi-finished valve products (4) further comprising providing at least two semi-finished valve products (4) being intended tin a valve (2), with the semi-finished valve products (4) surrounding a cavity, followed by welding together of the arranged at least two semi-finished valve products (4) into a valve.

7. The method for the production of a valve according to claim 5, with the method further comprising provision of sodium (12) or any other low-melting alloy in the cavity, with the provision preferably being performed before welding together the semi-finished valve products (4).

8. The method for the production of a valve pursuant to claim 5, with the method further comprising machining post-processing of the valve (2).

9. The method for the production of a valve pursuant to claim 5, with the method further comprising coating (18) of an outer face of the valve.

10. A valve manufactured of at least two semi-finished valve products (4) according to claim 3, which are arranged in a valve (2) and welded together into a valve with a cavity, with the cavity preferably being filled with a coolant, which is preferably sodium (12).

11. The method for the production of a valve according to claim 6, with the method further comprising provision of sodium (12) or any other low-melting alloy in the cavity, with the provision preferably being performed before welding together the semi-finished valve products (4).

12. The method for the production of a valve pursuant to claim 6, with the method further comprising machining post-processing of the valve (2).

13. The method for the production of a valve pursuant to claims 6, with the method further comprising coating (18) of an outer face of the valve.

14. A valve manufactured of at least two semi-finished valve products (4) according to claim 4, which are arranged in a valve (2) and welded together into a valve with a cavity, with the cavity preferably being filled with a coolant, which is preferably sodium (12).

Description

[0014] Hereinafter, this invention is illustrated based on exemplary embodiments that are presented as schematics in the figures.

[0015] FIGS. 1A to 1E represent the production method according to the invention for an internally cooled valve based on individual steps.

[0016] FIGS. 2A and 2B show another option of producing an internally cooled valve according to the inventions.

[0017] FIGS. 3A to 3C show an option of forging or drawing a semi-finished valve product from one sheet.

[0018] Below, same or similar reference signs are used in the descriptions and the figures to refer to same or similar elements or components.

[0019] FIG. 1A shows two semi-finished valve products 4 that are designed as valve half shells here. The valve half shells 4 essentially correspond to an internally cooled valve that has been cut open in the axial direction. The semi-finished valve products 4 comprise a valve stem 10 and a valve head 12. The semi-finished valve products essentially have an even wall thickness. However, it is also possible to use semi-finished valve products with a wall thickness that is larger than the wall thickness of the stem, e.g., in the head area.

[0020] In FIG. 1B, a sodium rod 14 is placed between the two semi-finished valve products 4, to serve as coolant. It is also possible to choose a shape for the sodium rod 14 that permits even distance from an inner surface of the respective valve half shells.

[0021] In FIG. 1C, the sodium rod 14 is inserted in one of the semi-finished valve products 4.

[0022] FIG. 1D shows the joined semi-finished valve products 4 connected with a weld 18. The finished internally cooled valve 2 may be subjected to machining in order to smooth the surface of the weld 18 in the longitudinal direction.

[0023] FIG. 1E can be considered a complete internally cooled valve 2 in which the longitudinal weld 18 from FIG. 1D has been levelled by final processing. The illustrated internally cooled valve has additionally been applied with a surface coating, so that the longitudinal weld is no longer visible in the coated valve 20.

[0024] FIG. 2A shows a semi-finished valve product 24 in the form of a quarter circle segment of a valve. Such a semi-finished valve product 24 can be produced with much less forming, which causes much lower tension in the semi-finished valve product 24. It is also imaginable to produce semi-finished valve products in the form of a third-circle segment, fifth-circle segment, sixth-circle segment or higher parts of a circle. In a sufficiently narrow segment, the semi-finished valve product 24 can only be produced by canting, since the share of the deformation in circumferential direction is negligible.

[0025] FIG. 2B presents a semi-finished valve product 4 in the form of a valve-half shell that is welded together out of two quarter-circle-segment semi-finished valve products 24 along the weld 18. This semi-finished valve product 4 can be used for production according to FIGS. 1A to 1 1E.

[0026] FIG. 3A shows a sheet that can be used as a semi-finished product for production of a semi-finished valve product 4. A semi-finished valve product 4 can be formed directly from a sheet by forging, drop-forging, pressing or deep-drawing.

[0027] FIG. 3B shows the sheet from FIG. 1, folded over on one end to produce a sheet with a higher material thickness. The folded part 8 of the sheet produces a larger material thickness of the sheet in the area of the later valve head 12.

[0028] FIG. 3C shows the sheet from FIG. 3B after drop forging, with the folded part 8 of the sheet connected to the remaining part of the sheet by welding or forge welding along the weld 18. Forming expands the part of the sheet that will later form the valve head in two directions, which would reduce the material thickness of the formed sheet. By using a semi-finished product with a higher material thickness in the area of the later valve head already, a valve can be produced easily with a wall thickness that is increased at the valve head or valve bottom as compared to the material thickness of the valve stem.

[0029] The semi-finished valve products produced according to FIGS. 3A to 3C can be used in the method presented in FIGS. 1A to 1E.

REFERENCE LIST

[0030] 2 Internally cooled valve [0031] 4 Semi-finished valve product, or valve-half shell [0032] 6 Sheet [0033] 8 Folded part of a sheet [0034] 10 Valve stem [0035] 12 Valve head [0036] 14 Coolant sodium [0037] 16 Coating [0038] 18 Weld [0039] 20 Coated valve [0040] 22 Semi-finished valve product, or valve quarter-shell