Formwork for directional solidification through lifting method and mounting system

Abstract

The utility model discloses a mould shell and a mounting system for directional solidification by a lifting method, which are characterized in that the mould shell is improved and is matched with a crystallization disc with a special structure, so that the smooth connection of the mould shell and the crystallization disc is ensured, and the directional solidification by the lifting method is realized. Therefore, the mold shell and installation system comprises a mold shell, a crystallization disc and a lifting mechanism, the mold shell comprises a base plate mold shell, a plurality of blade mold shells and a sprue mold shell, the sprue mold shell is arranged in the center of the bottom of the base plate mold shell, and the blade mold shells are arranged around the sprue mold shell. The upper end of each blade mold shell is connected with the base plate mold shell through a seed crystal mold shell, the lower end of each blade mold shell is communicated with the sprue mold shell through a cross gate mold shell, seed crystals are stuffed into the seed crystal mold shells, the crystallization disc is fixedly installed on the top end face of the base plate mold shell through a bolt assembly, and a through hole is formed in the position, corresponding to the sprue mold shell, of the crystallization disc. And a sprue of the smelting crucible penetrates through the through hole and is inserted into the sprue mold shell.

Description

Technical Field

[0001] This utility model belongs to the field of directional solidification technology, and in particular relates to a mold shell and installation system for upward directional solidification. Background Technology

[0002] Currently, a downward-pull-down process is generally used to produce high-temperature alloy single-crystal blade castings. During production, a mold shell filled with molten alloy is lowered from the heating zone to the cooling zone, achieving sequential solidification of the casting from bottom to top. This process is widely used in production due to its simplicity and practicality. However, during solidification, elemental segregation causes density reversal, resulting in an unstable state where the upper part is heavier than the lower part within the paste-like region. This leads to strong liquid convection and dendrite breakage, forming vertically chain-like freckled grain defects, ultimately rendering the single-crystal product unusable. The upward-pull-up process, by changing the solidification direction, allows the liquid in the paste-like region to form a stable state where the upper part is lighter than the lower part, avoiding convection and freckle formation. However, when using the upward-pull-up process, how to connect the mold shell and the lifting mechanism is a key problem that urgently needs to be solved. Summary of the Invention

[0003] The main purpose of this invention is to provide a mold shell and installation system for directional solidification by lifting. By improving the mold shell and using a crystallization disc with a special structure, the mold shell and the crystallization disc are smoothly connected, thus achieving directional solidification by lifting.

[0004] To address this, the present invention provides a mold shell and installation system for upward solidification, comprising a mold shell, a crystallization disc, and a lifting mechanism. The lifting mechanism is connected to the crystallization disc. The mold shell includes a base mold shell, blade mold shells, and a sprue mold shell. The sprue mold shell is located at the bottom center of the base mold shell. Multiple blade mold shells are arranged around the sprue mold shell. The upper end of each blade mold shell is connected to the base mold shell through a seed crystal mold shell, and the lower end is connected to the sprue mold shell through a horizontal sprue mold shell. A seed crystal is inserted into the seed crystal mold shell. The crystallization disc is fixedly installed on the top surface of the base mold shell by a bolt assembly. A through hole is provided on the crystallization disc at the position corresponding to the sprue mold shell. The gate of the melting crucible passes through the through hole and is inserted into the sprue mold shell.

[0005] Specifically, the bolt assembly includes a bolt and a nut, and the mold shell and the crystallization disk are provided with a connecting hole through which the bolt passes.

[0006] Specifically, the crystallization disk is a water-cooled disk.

[0007] Specifically, the lifting mechanism adopts a screw mechanism driven by a motor.

[0008] Compared with the prior art, the present invention has the following advantages: the crystallization disc is connected to the base of the mold shell using a bolt assembly, and a sprue is provided on the mold shell. A through hole is opened at the corresponding position of the crystallization disc. The gate of the melting crucible passes through the through hole and is inserted into the sprue. During pouring, an induction coil is sleeved on the outside of the melting crucible to heat the alloy material inside. After the alloy liquid melts the alloy plug placed at the bottom of the melting crucible through heat transfer, the alloy liquid is injected into the mold shell through the gate at the bottom of the melting crucible to achieve filling. Then, the lifting mechanism starts to lift upward, pulling the mold shell out from above the heating chamber at a preset pulling speed. During the upward lifting process of the mold shell, a temperature gradient is formed from top to bottom, thereby achieving directional solidification from top to bottom. The present invention achieves directional solidification by lifting upward while ensuring a smooth connection between the mold shell and the crystallization disc. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the mold shell and installation system provided in an embodiment of this utility model;

[0011] Among them: 1. Mold shell; 101. Base mold shell; 102. Blade mold shell; 103. Straight sprue mold shell; 104. Horizontal sprue mold shell; 105. Seed crystal mold shell; 2. Crystallization plate; 3. Lifting mechanism; 4. Bolt assembly; 5. Through hole; 6. Melting crucible; 7. Gate; 8. Heating chamber; 9. Pure nickel alloy plug; 10. Seed crystal. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0014] See Figure 1 A mold shell and installation system for upward solidification includes a mold shell 1, a crystallizing disc 2, and a lifting mechanism 3. The lifting mechanism 3 is connected to the crystallizing disc 2. The mold shell 1 includes a base mold shell 101, blade mold shells 102, and a sprue mold shell 103. The sprue mold shell 103 is located at the center of the bottom of the base mold shell 101, and its top end penetrates through the base mold shell 101. Multiple blade mold shells 102 are arranged around the sprue mold shell 103. Each blade mold... The upper end of shell 102 is connected to base mold shell 101 through seed crystal mold shell 105, and the lower end is connected to sprue mold shell 103 through horizontal sprue mold shell 104. Seed crystal 10 is inserted into seed crystal mold shell 105. Crystallization disk 2 is fixedly installed on the top surface of base mold shell 101 by bolt assembly 4. A through hole 5 is provided on crystallization disk 2 at the position corresponding to sprue mold shell 103. The gate 7 of melting crucible 6 passes through the through hole 5 and is inserted into sprue mold shell 103.

[0015] This invention utilizes a bolt assembly 4 to connect the crystallizing disc 2 to the base of the mold shell 1. A sprue is provided on the mold shell 1, and a through hole 5 is opened at the corresponding position on the crystallizing disc 2. The gate 7 of the melting crucible 6 passes through this through hole 5 and is inserted into the sprue mold shell 103. During casting, the seed crystal 10 is inserted from the top of the base mold shell 101 into the seed crystal mold shell 105. An induction coil is fitted around the outside of the melting crucible 6 to heat the alloy material inside. After the molten alloy melts the pure nickel alloy plug 9 pre-placed at the bottom of the melting crucible 6 through heat transfer, the molten alloy is injected into the sprue through the gate 7 at the bottom of the melting crucible and then poured horizontally. The mold enters each blade cavity, and then the lifting mechanism 3 begins to lift it upwards, pulling the mold shell 1 out from above the heating chamber 8 at a preset pulling speed. During the upward lifting process of the mold shell 1, a temperature gradient is formed from top to bottom, thereby achieving directional solidification from top to bottom. This invention achieves directional solidification by lifting upwards while ensuring a smooth connection between the mold shell 1 and the crystallizing plate 2. At the same time, the melting crucible 6 and the mold shell 1 are connected by a plug-in connection. After the directional solidification is completed, the melting crucible 6 is pulled out from the top of the mold shell 1, and the melting crucible 6 can be used for the casting of the next mold shell. The melting crucible 6 can be reused.

[0016] See Figure 1 Specifically, the bolt assembly 4 includes bolts and nuts. The mold shell 1 and the crystallization disk 2 have connecting holes for the bolts to pass through. The bolts pass through the connecting holes and connect with the nuts, thereby firmly fixing the mold shell 1 to the crystallization disk 2. The bolts and nuts can be made of high-temperature resistant carbon fiber. To ensure the reliability of the connection, multiple bolt assemblies 4 can be provided. The cooling medium for the crystallization disk 2 can be water, or other commonly used cooling media. The lifting mechanism 3 uses a motor-driven screw mechanism. The specific structure of the screw mechanism is existing technology and will not be described in detail here.

[0017] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Anyone skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of the invention. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this invention.

[0018] Meanwhile, if the present invention discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by casting) (except where it is obviously impossible to use an integral forming process).

[0019] Furthermore, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model include states or shapes that are similar to, analogous to, or close to those states or shapes. Any component provided by this utility model can be assembled from multiple individual components or can be a single component manufactured using a one-piece molding process.

[0020] The above embodiments are merely illustrative examples to clearly illustrate the present invention, and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A mold shell and mounting system for lifting directional solidification, comprising a mold shell, a crystallizing disc, and a lifting mechanism, wherein the lifting mechanism is connected to the crystallizing disc, characterized in that: The mold shell includes a base mold shell, a blade mold shell, and a sprue mold shell. The sprue mold shell is located at the bottom center of the base mold shell. Multiple blade mold shells are arranged around the sprue mold shell. The upper end of each blade mold shell is connected to the base mold shell through a seed crystal mold shell, and the lower end is connected to the sprue mold shell through a horizontal sprue mold shell. A seed crystal is inserted into the seed crystal mold shell. The crystallization disk is fixedly installed on the top surface of the base mold shell by a bolt assembly. The crystallization disk has a through hole corresponding to the position of the sprue mold shell. The gate of the melting crucible passes through the through hole and is inserted into the sprue mold shell.

2. The mold and mounting system according to claim 1, characterized in that: The bolt assembly includes Bolts and nuts are provided, and the mold shell and the crystallization plate are provided with connecting holes through which the bolts pass.

3. The mold and mounting system according to claim 1, characterized in that: The crystallization disk is a water-cooled disk.

4. The mold and mounting system according to claim 1, characterized in that: The lifting mechanism is a screw mechanism driven by a motor.

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