Improved casting core for a cast hollow component, method, and cast part

Abstract

The invention relates to a core (11) for producing hollow turbine blades, the core having an outer frame (4) which has bars (10) between an outer stabilization region (17) and an additional solid inner block (25), wherein open regions (7) are thereby provided between the bars (10), and a reinforcement (30, 31, 32) is provided in at least one hollow region (7) between two directly adjacent bars (10).

Description

[0001] 2024 PF00587

[0002] Improved casting core for a cast hollow component,

[0003] Process and casting

[0004] The invention relates to casting cores used to produce hollow components through them, a method and a casting.

[0005] Most turbine blade designs for gas turbines require an internal core during casting to model the internal cooling features. These designs become increasingly complex over time, particularly in the thin-walled area of ​​the trailing edge. This necessitates a core frame at the ends to stabilize the core against core breakage during manufacturing.

[0006] One challenge is core breakage during manufacturing. This affects the yield and the delivery time.

[0007] It is therefore the purpose of the invention to solve the problem mentioned above.

[0008] The problem is solved by a casting core according to claim 1 by a method according to claim 10 and a casting according to claim 11.

[0009] The subclaims list further advantageous measures which can be combined arbitrarily to achieve further advantages.

[0010] They show

[0011] Figure 1 shows a prior art core,

[0012] Figure 2, 3 improved cores,

[0013] Figure 4 shows another embodiment of the invention.

[0014] The figures and description represent only exemplary embodiments of the invention. 2024 PF00587

[0015] Figure 1 shows a prior art kernel 1 '.

[0016] Here, only a section of the end area of ​​a core 1 ' for turbine blades in the area of ​​a downstream edge is shown.

[0017] The core 1' has a closed frame 4 with an outer longitudinal edge 16. The longitudinal edge 16 serves for stabilization.

[0018] Line 13 represents the area of ​​the outflow edge of the component to be manufactured.

[0019] Between longitudinal edge 16 and line 13 there is a stabilization area 17 .

[0020] The core 1 ' has a massive block 25 which extends in radial direction 19 and longitudinal direction 22, forming a cavity in the turbine blade.

[0021] A radial direction 19 also represents the radial orientation of the turbine blades. The longitudinal direction or subsequent flow direction perpendicular to this is marked with 22.

[0022] Several beams 10 extend transversely to this in the longitudinal direction 22, representing the outlet openings or pockets in the area of ​​a downstream edge of a turbine blade.

[0023] The areas 7 between the beams 10 form the webs of a downstream edge of turbine blades .

[0024] The transition 14 (see Figure 2 for a better view) between the open areas 7 and the solid block 25 is preferably curved or circular, oval or parabolic in shape.

[0025] Other geometries are conceivable. 2024 PF00587

[0026] The beams 10 do have a certain thickness (perpendicular to the drawing plane), but these beams 10 in particular break very easily.

[0027] Figure 2 shows a core 1 according to the invention with a reinforcement 30 ' on the solid block 25 in the open area 7 between two directly adjacent beams 10.

[0028] The reinforcement 30 ' has a significantly thinner, in particular at least 40%, and most especially at least 60% thinner wall thickness (perpendicular to longitudinal direction 22 and radial direction 19) compared to the thickness of the beam 10 .

[0029] The reinforcement 30 has a similar shape in the longitudinal direction 22 at its end 37, and is therefore preferably curved or circular, oval or parabolic in shape.

[0030] The reinforcement 30 ' is preferably plate-shaped.

[0031] The reinforcement 30 ' is, viewed in the longitudinal direction 22, preferably symmetrically formed .

[0032] The reinforcement 30 ' extends directly from the massive block 25 in the longitudinal direction 22 over at least 5% and at most 30% of the length of the open area 7 .

[0033] This reinforcement 30 ' can preferably be present in some specifically selected areas 7 .

[0034] This reinforcement 30 ' can preferably be present in all areas 7 .

[0035] In particular, the reinforcement 30 ' is formed in the edge region 18 of the core 1 .

[0036] Figure 3 shows a further embodiment of a core 11 in which reinforcements 30, 31, 32 are formed only in two or three open areas 7', 7'', 7'''' at the edge 18 of the core 11. 2024 PF00587

[0037] The extension of the reinforcements 30, 31, 32 in the longitudinal direction 22 to the edge region 18 is preferably longer.

[0038] Figure 4 shows another variant in which the reinforcements 41, 42, 42 in the areas 7 ', 7 '', . . have a different shape and essentially form a continuous, rising, curved line.

[0039] As a result, the reinforcements 41, 42, 43 are asymmetrically formed.

[0040] The extension of the reinforcements 41, 42, 43 in longitudinal direction 22 also increases towards the edge area 18.

[0041] The outer edge of the reinforcement 41 is slightly concave. The first reinforcement 41 rises from the ground at a certain height. The second, directly adjacent reinforcement 42 preferably begins below it at the height of the first reinforcement 42 and rises to a second endpoint within the region 13. Then, in the third or final region 43, the reinforcement also begins there, having ended in the second region 42, and also rises to a third endpoint.

[0042] The following positive effects are to be expected:

[0043] • Reduced delivery time.

[0044] • Increased yield rates.

[0045] • Reduced manufacturing costs.

[0046] • No negative effects on engine performance and component lifespan.

[0047] • Applicable for buckets and guide wheels as well as for various frames.

[0048] • Quick and easy tool customization for existing designs

Claims

2024 PF00587 Patent claims 1. kernel ( 1 , 11 , 111 ) for the manufacture of hollow turbine blades, which has an outer frame ( 4 ), the beam ( 10 ) between an outer stabilizing area ( 17 ) and a more internal solid block ( 25 ) has , whereupon open areas (7) are given between the beams (10), characterized by the fact that ss in at least one hollow area ( 7 ) between two directly adjacent beams ( 10 ) a reinforcement ( 30 ' , 30 , 31 , 32 , 41 , 42 , 43 ) is formed .

2. Core according to claim 1, in which several reinforcements ( 30 ' , 30 , 31 , 32 , 41 , 42 , 43 ) are formed only in a radial ( 19 ) edge region ( 18 ) of the core ( 1 , 11 , 111 ).

3. Core according to claim 1 or 2 , where the reinforcements ( 30 ' , 30 , 31 , 32 , 41 , 42 , 43 ) extend in the longitudinal direction ( 22 ) at least 5% and in particular at most 30% of the length of the hollow area ( 7 ).

4. Core according to one or more of the preceding claims, wherein the reinforcements ( 30 ' , 30 , 31 , 32 , 41 , 42 , 43 ) constitute at most 60%, in particular at most 40% , the thickness of the adjacent beams ( 10 ) exhibit .

5. Core according to one or more of the preceding claims, which has reinforcements (30', 30, 31, 32, 41, 42, 43) in several open areas (7).

6. Core according to one or more of the preceding claims, wherein one end (37) of a reinforcement (30', 30, 31, 32, 41, 42, 43) is concavely bent, circular, oval, or 2024 PF00587 is parabolic in shape.

7. Core according to one or more of the preceding claims, which has reinforcements (30, 31, 32, 41, 42, 43) in several open areas (7). whose length in the longitudinal direction ( 22 ) towards the edge area ( 18 ) becomes longer .

8. Core according to one or more of the preceding claims 1 to 6 , in which the reinforcements ( 30 , 31 , 32 ) are of equal length.

9. Core according to one or more of the preceding claims, wherein the reinforcements ( 41 , 42 , 43 ) are asymmetrically formed and become longer in their extent in the longitudinal direction ( 22 ) towards the edge region ( 18 ).

10. Casting methods, wherein a core ( 1 , 11 , 111 ) is used according to one or more of the preceding claims .

11. Casting steeply manufactured with a core ( 1 , 11 , 111 ) according to one or more of the preceding claims .

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