Impeller evanescent mode mold

Abstract

The utility model discloses an impeller evanescent mode mould which comprises an upper mould and a lower mould, the upper surface of the lower mould is provided with a first limit groove used for assembling a first loose core, and the upper surface of the lower mould is provided with a plurality of groups of blade grooves which are uniformly arranged around the first limit groove. A first blade mold matched with the blade groove is movably assembled in each blade groove, an abutting space exists between the tail end face of each first blade mold and the corresponding inner wall of the blade groove, and a second limiting groove corresponding to the first limiting groove and assembled with a second core column is formed in the lower surface of the upper mold; the lower surface of the upper die is provided with second blade dies which are evenly arranged around the second limiting groove and matched with the first blade dies, and the lower surface of the upper die is provided with a plurality of sets of inclined pressing blocks abutting against the tails of the first blade dies. Product quality is effectively guaranteed, and the evanescent mode is not prone to deformation and damage.

Description

Technical Field

[0001] The utility model relates to the technical field of lost foam, in particular to an impeller lost foam mould. Background Art

[0002] With the continuous development of the aerospace industry, the requirements for impellers in aerospace are getting higher and higher. Since the blades of the impeller are spirally arranged on the periphery of the impeller without any fixed support, when using the mold to make the lost foam of the impeller, the position of the blades is prone to material shortage and deformation. In addition, for the existing molds for making impellers, the live block in the cavity must be taken out with the product, which is easy to cause damage to the lost foam during demoulding, especially the blade part. When taking out the product, there is a problem of taking out the live block from the cavity. The mold block is prone to collision. Taking out the live block and placing it again reduces production efficiency, making the parameters of the impeller finally produced unable to meet the design requirements. Utility Model Content

[0003] The utility model aims to provide an impeller lost foam mold to solve the problems raised in the above background technology.

[0004] To achieve the above purpose, the utility model is implemented by the following technical means:

[0005] A lost foam mold for an impeller comprises an upper mold and a lower mold which cooperate with each other and have a cavity, the upper surface of the lower mold is provided with a first limiting groove for assembling a first core pulling, the upper surface of the lower mold is provided with a plurality of groups of blade grooves which are evenly arranged around the first limiting groove, each of the blade grooves is movably provided with a first blade mold which cooperates with the blade groove, there is abutting space between the tail end face of the first blade mold and the corresponding inner wall of the blade groove, the lower surface of the upper mold is provided with a second limiting groove which corresponds to the first limiting groove and is provided with a second core column, the lower surface of the upper mold is provided with a second blade mold which is evenly arranged around the second limiting groove and cooperates with each first blade mold, the lower surface of the upper mold is provided with a plurality of groups of inclined pressure blocks which abut against the tail of each first blade mold, and the upper mold is also provided with a plurality of groups of feed ports distributed on the outside of the second blade mold.

[0006] Compared with the prior art, the utility model has the following beneficial effects:

[0007] When the utility model is used, the upper mold and the lower mold cooperate to form a mold cavity for casting the required impeller, and the first blade mold and the second blade mold cooperate to form the impeller blade. Under the action of the inclined pressure block, the first blade mold is relatively stably installed in the blade groove, and the first core column and the second core column installed on the first limiting groove and the second limiting groove can improve the overall forming strength of the lost mold. When the impeller lost mold is demolded, the upper mold is separated from the lower mold, and then the first blade mold is slid outward in the blade groove, so that the first blade mold only slides in the blade groove, and the first blade mold does not need to be taken out. When taking out the product, there is no problem of taking out the live block in the mold cavity when taking out the product, and the problem of the mold block bumping is avoided, so that the impeller lost mold will not bump, and because there is no problem of the live block, the operation is relatively simple, which saves the time of placing the live block again to prepare the mold block, saves time and labor, reduces the uncertainty of human intervention, effectively guarantees the product quality, and the lost mold is not easy to deform or break. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the product structure in the embodiment of the utility model;

[0009] Figure 2 This is a schematic diagram of the top view of the product structure in the embodiment of the utility model;

[0010] Figure 3 For the utility model embodiment along Figure 2 AA section structural diagram;

[0011] Figure 4 This is a schematic diagram of the structure of a part of the product in the embodiment of the utility model;

[0012] Figure 5 This is a schematic diagram of the structure of a part of the product in the embodiment of the utility model;

[0013] Figure 6 This is a schematic diagram of the structure of the lower mold part of the product in the embodiment of the utility model;

[0014] Figure 7 This is a schematic diagram of the structure of the lower mold part of the product in the embodiment of the utility model;

[0015] Figure 8 This is a schematic diagram of the structure of a part of the product in the embodiment of the utility model;

[0016] Fig. 9 This is a schematic diagram of the structure of the first blade mold in the embodiment of the utility model;

[0017] Fig.10 This is a schematic diagram of the structure of a part of the product in the embodiment of the utility model;

[0018] Fig.11This is a schematic diagram of the second blade mold structure in an embodiment of the utility model;

[0019] Fig.12 It is a schematic diagram of the structure of the oblique pressure block in the embodiment of the utility model. DETAILED DESCRIPTION

[0020] The following is a detailed description of the embodiments of the technical solution of the present application in conjunction with the accompanying drawings. The following embodiments and drawings are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application. The accompanying drawings only schematically show the parts related to the technical solution of the present application, and they do not represent the actual structure of the product.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0022] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0023] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0025] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0026] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0027] With the continuous development of the aerospace industry, the requirements for impellers in aerospace are getting higher and higher. Since the blades of the impeller are spirally arranged on the periphery of the impeller without any fixed support, when the lost foam of the impeller is made using a mold, the position of the blades is prone to material shortage and deformation. In addition, the existing mold for making impellers is prone to damage to the lost foam during demoulding, especially the blade position, so that the parameters of the impeller finally produced cannot meet the design requirements.

[0028] In the present embodiment, an impeller lost foam mold comprises an upper mold 1 and a lower mold 2 which cooperate with each other and have a cavity, the upper surface of the lower mold 2 is provided with a first limiting groove 4 for assembling a first core pulling 3, the upper surface of the lower mold 2 is provided with a plurality of groups of blade grooves 5 evenly arranged around the first limiting groove 4, each of the blade grooves 5 is movably equipped with a first blade mold 6 that cooperates with the blade groove 5, and there is a resisting space 7 between the tail end face of the first blade mold 6 and the corresponding inner wall of the blade groove 5, the lower surface of the upper mold 1 is provided with a second limiting groove 9 corresponding to the first limiting groove 4 and equipped with a second core column 8, the lower surface of the upper mold 1 is provided with a second blade mold 10 evenly arranged around the second limiting groove 9 and cooperating with each first blade mold 6, and the lower surface of the upper mold 1 is provided with a plurality of groups of inclined pressure blocks 11 that resist the tail of each first blade mold 6; when the utility model is used, the upper mold 1 and the lower mold 2 cooperate to form the cavity for casting the impeller, that is, the above-mentioned first limiting groove The casting cavity of the impeller lost mold is formed between the groove 4 and the second limiting groove 9, and is configured into an impeller blade through the cooperation of the first blade mold 6 and the second blade mold 10. The first blade mold 6 is relatively stably installed in the blade groove 5 under the action of the inclined pressure block 11, and the first core column and the second core column 8 installed on the first limiting groove 4 and the second limiting groove 9 can improve the overall molding strength of the lost mold, and one or more of the first core column and the second core column 8 can be provided with an injection port to inject material into the casting cavity. When the impeller lost mold is demolded, the upper mold 1 is separated from the lower mold 2, and then the first blade mold 6 is slid outward in the blade groove 5, so that the first blade mold 6 only slides in the blade groove 5, and the first blade mold 6 does not need to be taken out, so that the impeller lost mold will not be bumped, the operation is simple, time-saving and labor-saving, and the product quality is effectively guaranteed. The lost mold is not easy to deform or damage; in the embodiment of the utility model, only the corresponding injection port is provided on the second core column 8 of the upper mold 1.

[0029] In a possible embodiment of the utility model, in this embodiment, the structure of each component in the utility model will be described in conjunction with the accompanying drawings. The shapes of the upper mold 1 and the lower mold 2 are various. In this embodiment, a structure of the upper mold 1 and the lower mold 2 is disclosed. Referring to the accompanying drawings, the lower mold 2 includes a polygonal frame bottom 101, and the upper part of the polygonal frame bottom 101 extends upward along the inner edge of the frame edge to be provided with a plurality of groups of vertical side panels 102 connected in sequence on both sides, and the top of each vertical side is connected with a top plate 103, so as to form a convex structure with a cavity inside. The polygonal frame bottom 101, the vertical side panels 102, and the top plate 103 are The one-piece molding structure is easy to assemble. The joints of each vertical side panel 102 are chamfered and rounded. As shown in the attached drawings of the present invention, the lower mold 2 adopts a quadrilateral frame bottom, and the quadrilateral frame bottom is connected with four groups of vertical side panels 102 extending upward. The two opposite sides of each adjacent vertical side panel 102 are connected and then chamfered and rounded. The top plate 103 structure is compatible with the structure formed by each vertical side panel 102; in other embodiments, an upper mold structure composed of a pentagonal frame bottom, a hexagonal frame bottom, an octagonal frame bottom, etc. can be adopted. Accordingly, a polygonal groove is provided at the bottom of the polygonal frame bottom 101, which is convenient for positioning the lower mold on the mounting base.

[0030] In the embodiment of the utility model, the upper surface of the lower mold 2 is provided with a first limiting groove 4 for assembling the first core pulling 3, and the lower surface of the upper mold 1 is provided with a second limiting groove 9 corresponding to the first limiting groove 4 and assembling the second core column 8. The upper mold 1 and the lower mold 2 cooperate to form a cavity for casting the required impeller, wherein the first limiting groove 4 gradually extends and shrinks downward along its vertical center line, that is, the first limiting groove 4 is opened on the top plate 103 of the lower mold 2, extends downward and gradually shrinks and has a first convex nozzle structure that cooperates with the first core pulling 3, and the second limiting groove 9 corresponds to the first limiting groove 4, that is, the second limiting groove 9 is opened on the upper mold 1 and gradually extends downward and gradually shrinks. The second convex nozzle structure extends and contracts upward and cooperates with the first limiting groove 4, the vertical center line of the first limiting groove 4 and the vertical center line of the second limiting groove 9 are on the same straight line, and the top surface of the lower mold 2 is connected to the bottom surface of the upper mold 1, so that the first limiting groove 4 and the second limiting groove 9 can together form a cavity for casting the required impeller; as shown in the attached drawings of the utility model, according to the design requirements of the impeller, a plurality of groups of first grooves and second grooves (not marked in the figure) surrounding the first limiting groove 4 and the second limiting groove 8 can be respectively opened on the surfaces of the first limiting groove 4 and the second limiting groove 8, and the shape of the groove depends on the specific processing requirements of the impeller structure.

[0031] In a possible embodiment of the present invention, a plurality of reinforcing plates 1031 are provided on the lower surface of the top plate 103 to enhance the rigidity of the lower mold 2; accordingly, a plurality of positioning holes (not marked in the figure) corresponding to the upper mold 1 and a plurality of mounting holes (not marked in the figure) for assembling the lower mold 2 are also provided on the top plate 103.

[0032] In a possible embodiment of the utility model, the upper surface of the lower mold 2 is provided with a plurality of groups of blade grooves 5 evenly arranged around the first limiting groove 4. In this embodiment, the upper surface of the lower mold 2 is provided with 8 groups of blade grooves 5 evenly arranged around the first limiting groove 4. The 8 groups of blade grooves 5 are spirally connected with the first limiting groove 4. Along the vertical downward direction, each of the blade grooves 5 includes an assembly guide portion 51, a limiting portion 52, and an abutting portion 53. The head of the assembly guide portion 51 is in an arc shape, the inner arc edge of the assembly guide portion 51 is a gradually shrinking arc structure, and the outer arc edge of the assembly guide portion 51 is a gradually increasing arc structure. The inner arcuate edge of the positioning portion 52 is connected and matched with the assembly guide portion 51 and gradually shrinks, the outer side edge of the limiting portion 52 is a straight edge, the outer side edge of the abutting portion 53 is connected with the outer side edge of the limiting portion 52 and is on the same plane, the inner side edge of the abutting portion 53 is connected with the inner arcuate edge of the limiting portion 52 and is parallel to the outer side edge of the abutting portion 53, and the side edge of the abutting portion 53 is connected with the outer side edge and the inner side edge fillet, so that the first blade mold 6 is assembled and matched with the assembly guide portion 51 and the limiting portion 52 through the assembly guide portion 51, the limiting portion 52, and the abutting portion 53 of the blade groove 5, and the blade groove 5 provides the first blade mold 6 with assembly limit and activity space;

[0033] In this embodiment, the first blade mold 6 includes a slider 61 that cooperates with the assembly guide portion 51 and the limit portion 52 in the blade groove 5. The slider 61 includes a punch head 611, a punch middle portion 612, and a punch tail 613. The top surface of the punch tail 613 is on the same plane as the top surface of the lower mold 2. The punch tail 613 is higher than the punch head 611 and the punch middle portion 612. The top connection between the punch middle portion 612 and the punch tail 613 is in an arc shape. A pull-out hole 614 is provided on the upper surface of the tail of the first blade mold 6, which is convenient for the operator to slide the first blade mold 6 out of the blade groove 5 through the pull-out hole 614, so that when the impeller lost mold is taken out, it will not be scratched, thereby ensuring product quality.

[0034] In order to improve the sliding ability of the slider 61, a notch 615 is provided on the inner side of the punch head 611 of the slider 61, and a groove 511 is provided on the inner side of the head of the blade groove 5. The space formed by the groove 511 and the notch 615 is equipped with a mounting block 52 that cooperates with the blade groove 5 and the slider 61, and the top surface of the mounting block 52 is a curved surface that cooperates with the first blade mold 6.

[0035] In a possible embodiment of the utility model, the lower surface of the upper mold 1 is provided with a second limiting groove 9 corresponding to the first limiting groove 4 and equipped with the second core column 8, the lower surface of the upper mold 1 is provided with a second blade mold 10 evenly arranged around the second limiting groove 9 and matched with each first blade mold 6, and the lower surface of the upper mold 1 is provided with a plurality of groups of oblique pressure blocks 11 that abut against the tail of each first blade mold 6;

[0036] Among them, in this embodiment, the shape of the upper mold 1 is similar to the shape of the lower mold 2 in the aforementioned embodiment, which is a convex structure with a cavity inside. The second limiting groove 9 gradually extends and shrinks upward along its vertical center line, that is, the second limiting groove 9 is opened on the bottom plate of the upper mold 1, extends upward and gradually shrinks and has a second convex mouth structure that cooperates with the second core column 8. The bottom plate of the upper mold 1 is provided with 8 groups of arc-shaped limiting grooves 121 surrounding the second limiting groove 9 and used to install the second blade mold 10. Each arc-shaped limiting groove 121 is equipped with a second blade mold 10 that cooperates with the first blade mold 6. The lower surface of the bottom plate of the upper mold 1 is provided with 8 groups of vertical center lines surrounding the second limiting groove 9. The inclined pressing block 11 is evenly distributed and connected to the tail side of the first blade mold 6. The inclined pressing block 11 includes two symmetrical and downwardly inclined inclined side surfaces 111. The top of the inclined pressing block 11 is provided with a hole 112 that cooperates with the upper mold 1. Correspondingly, the tail side of the first blade mold 6 is an inclined surface parallel to the inclined side surface 111 of the inclined pressing block 11. In this way, during the cooperation between the upper mold 1 and the lower mold 2, the inclined pressing block 11 can resist the tail of the first blade mold 6, so that the first blade mold 6 is tightly and firmly installed in the corresponding blade groove 5; through the first blade mold 6 and the second blade mold 10, it is possible to prevent the impeller lost mold from being scratched when it is taken out, thereby ensuring product quality.

[0037] In a possible embodiment of the present utility model, in order to facilitate the injection of material into the cavity formed by the upper mold 1 and the lower mold 2, the second core column 8 is provided with a plurality of injection ports 81 that are evenly distributed and communicate with the cavity formed by the upper mold and the lower mold; the upper mold 1 is also provided with a plurality of groups of feed ports 12 distributed on the outside of the second blade mold 10, which cooperate with the lower mold 2 to cast other components; the specific embodiments disclosed in the present utility model fall within the scope of protection of the claims of the present utility model, and are the specific lower implementation scope of the characteristic part of the present utility model. The protection content of the specific embodiments is merely an explanation of the protection scope of the claims of the present utility model. The protection scope of the present utility model is not limited to the protection content of the specific embodiments, and the protection content of the specific embodiments should not be understood as a limitation on the protection scope of the claims of the present utility model.

Claims

1. An impeller lost foam mold, characterized in that: The invention comprises an upper die (1) and a lower die (2) which cooperate with each other and have a cavity. The upper surface of the lower die (2) is provided with a first limiting groove (4) for assembling a first core puller (3). The upper surface of the lower die (2) is provided with a plurality of blade grooves (5) which are evenly arranged around the first limiting groove (4). A first blade mold (6) which cooperates with the blade groove (5) is movably assembled in each blade groove (5). There is abutting space (7) between the tail end surface of the first blade mold (6) and the corresponding inner wall of the blade groove (5). The lower surface of the upper die (1) is provided with a second limiting groove (9) which corresponds to the first limiting groove (4) and is equipped with a second core column (8). The lower surface of the upper die (1) is provided with second blade molds (10) which are evenly arranged around the second limiting groove (9) and are matched with each first blade mold (6). The lower surface of the upper die (1) is provided with a plurality of inclined pressure blocks (11) which abut against the tail of each first blade mold (6).

2. The impeller lost foam mold according to claim 1, characterized in that: The lower mold (2) comprises a polygonal frame bottom (101), the upper part of the polygonal frame bottom (101) extending upward along the inner edge of the frame edge and provided with a plurality of groups of vertical side panels (102) whose two side portions are sequentially connected, the top of each vertical side edge is cooperatively connected with a top panel (103), the polygonal frame bottom (101), the vertical side panels (102) and the top panel (103) are an integrally formed structure, and the lower surface of the top panel (103) is provided with a plurality of groups of reinforcing panels (1031).

3. The impeller lost foam mold according to claim 1, characterized in that: The first limiting groove (4) is a first protruding mouth structure formed on the top plate (103) of the lower mold (2), extending downward and gradually shrinking, and having a first protruding mouth structure that cooperates with the first core pulling (3). The second limiting groove (9) corresponds to the first limiting groove (4), that is, the second limiting groove (9) is a second protruding mouth structure formed on the upper mold (1), extending upward and shrinking gradually, and cooperating with the first limiting groove (4). The vertical center line of the first limiting groove (4) and the vertical center line of the second limiting groove (9) are on the same straight line, and the top surface of the lower mold (2) is connected to the bottom surface of the upper mold (1).

4. The impeller lost foam mold according to claim 1, characterized in that: The upper surface of the lower mold (2) is provided with 8 groups of blade grooves (5) uniformly arranged around the first limiting groove (4); the 8 groups of blade grooves (5) are spirally connected to the first limiting groove (4); along the vertical downward direction, each of the blade grooves (5) includes an assembly guide portion (51), a limiting portion (52), and an abutting portion (53); the head of the assembly guide portion (51) is in an arc shape; the inner arc side of the assembly guide portion (51) is in a gradually shrinking arc structure; the outer side of the assembly guide portion (51) is in a gradually shrinking arc structure; The side arc-shaped edge is a gradually increasing arc-shaped structure, the inner arc-shaped edge of the limiting portion (52) is connected to and cooperates with the assembly guide portion (51) and gradually shrinks, the outer side edge of the limiting portion (52) is a straight edge, the outer side edge of the abutting portion (53) is connected to the outer side edge of the limiting portion (52) and is on the same plane, the inner side edge of the abutting portion (53) is connected to the inner arc-shaped edge of the limiting portion (52) and is parallel to the outer side edge of the abutting portion (53), and the side edge of the abutting portion (53) is connected to its outer side edge and inner side edge rounded corners.

5. The impeller lost foam mold according to claim 1, characterized in that: The first blade mold (6) includes a slider (61) that cooperates with the assembly guide portion (51) and the limit portion (52) in the blade groove (5); the slider (61) includes a punch head (611), a punch middle portion (612), and a punch tail portion (613); the top surface of the punch tail portion (613) and the top surface of the lower mold (2) are on the same plane; the punch tail portion (613) is higher than the punch head portion (611) and the punch middle portion (612); the top connection between the punch middle portion (612) and the punch tail portion (613) is in an arc shape; and a pull-out hole (614) is provided on the upper surface of the tail portion of the first blade mold (6).

6. The impeller lost foam mold according to claim 5, characterized in that: A notch (615) is provided on the inner side of the convex head (611) of the slider (61), and a clamping groove (511) is provided on the inner side of the head of the blade groove (5). A mounting block that cooperates with the blade groove (5) and the slider (61) is installed in the space formed by the clamping groove (511) and the notch (615), and the top surface of the mounting block is a curved surface that cooperates with the first blade mold (6).

7. The impeller lost foam mold according to claim 1, characterized in that: The bottom plate of the upper mold (1) is provided with 8 groups of arc-shaped limit grooves (121) surrounding the second limit groove (9) and used to install the second blade mold (10), and each arc-shaped limit groove (121) is equipped with a second blade mold (10) that matches the first blade mold (6). The lower surface of the bottom plate of the upper mold (1) is provided with 8 groups of inclined pressure blocks (11) that are evenly distributed around the vertical center line of the second limit groove (9) and connected to the tail side of the first blade mold (6), and the inclined pressure block (11) includes two symmetrical and downwardly inclined inclined side surfaces (111). The top of the inclined pressure block (11) is provided with a hole (112) that matches the upper mold (1), and the tail side of the first blade mold (6) is an inclined surface parallel to the inclined side surface (111) of the inclined pressure block (11).

8. The impeller lost foam mold according to claim 1, characterized in that: The second core column (8) is provided with a plurality of injection ports (81) evenly distributed and communicating with the cavity formed by the upper mold and the lower mold; the upper mold (1) is also provided with a plurality of groups of feed ports (12) distributed outside the second blade mold (10).

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