A casting mold

Abstract

The present application discloses a casting mold, including a runner and a molding cavity, and also including: a riser bag connected to the runner for storing molten metal; a riser neck, wherein the first port of the riser neck is connected to the riser bag, the second port is connected to the molding cavity, and the second port is opened at the distal end of the molding casting in the molding cavity. The casting mold provided by the present invention can replenish molten metal at the distal end of the casting by adding a riser bag and a riser neck, which not only avoids the occurrence of shrinkage cavities, but also eliminates the need to set up chills, process cores or subsidies, thereby simplifying the casting process and improving the working effect of the casting process.

Description

Technical Field

[0001] The invention relates to the technical field of casting equipment, in particular to a casting mold. Background Art

[0002] When castings are cast using casting molds, shrinkage holes often occur on the castings. Shrinkage holes are a type of casting defect. The formation mechanism of shrinkage holes is as follows: the molten metal passes through the gate, runner and riser of the casting mold and enters the molding cavity of the casting mold. When the molten metal is cooled and molded in the molding cavity, the volume shrinks. If the casting is not replenished with molten metal in time during the shrinkage process, holes will form at the shrinkage position, namely shrinkage holes.

[0003] In the casting process, for the independent hot junctions of the castings that are far away from the runner and prone to shrinkage cavities, the methods to solve shrinkage cavities generally include: placing chills at the locations prone to shrinkage cavities; setting process cores at the locations prone to shrinkage cavities; adding subsidies at the locations prone to shrinkage cavities, and the thickness of the subsidies depends on the size of the castings and the size of the shrinkage cavities. However, the above three methods will increase the operation steps of removing chills or process cores and grinding excess subsidies, making the casting process more cumbersome and complicated, and will also increase production costs, affecting the working effect of the casting process.

[0004] Therefore, how to improve the working effect of the casting process while avoiding shrinkage cavities has become a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, the present invention provides a casting mold, which can avoid shrinkage holes on the casting by improving its structure, simplify the casting process, and improve the working effect of the casting process.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A casting mold, comprising a runner and a molding cavity, further comprising:

[0008] A riser bag communicated with the runner and used for storing liquid metal;

[0009] A riser neck, wherein a first port of the riser neck is communicated with the riser package, a second port of the riser neck is communicated with the molding cavity, and the second port is opened at a position of the molding casting distal end of the molding cavity.

[0010] Preferably, in the above casting mold, the riser neck is a thin-sheet riser neck with an inner cavity width of 4 mm to 8 mm.

[0011] Preferably, in the above-mentioned casting mold, the inner cavity of the riser neck is a gradually expanding cavity that gradually expands from the first port to the second port, and the width of the first port is 4mm~6mm, the width of the second port is 6.1mm~8mm, and the distance between the first port and the second port is 10mm~25mm.

[0012] Preferably, in the above casting mold, the connection trace between the edge of the second port and the inner wall of the molding cavity is a plurality of line segments connected in sequence, and the plurality of line segments are connected to form a step-like structure.

[0013] Preferably, in the above casting mold, the riser necks are multiple and are symmetrically arranged about the vertical center line of the riser package.

[0014] The casting mold provided by the present invention mainly includes a runner, a molding cavity, and an additional riser bag and a riser neck, wherein the riser bag is connected to the runner and can store molten metal, and the riser neck is mainly used to guide the molten metal in the riser bag, the first port of the riser neck is connected to the riser bag, and the second port is connected to the molding cavity, so that the molten metal in the riser bag can enter the molding cavity through the riser neck, and more importantly, the second port of the riser neck is opened at a position on the molding cavity, which is a position of the molding cavity used for molding the far end of the casting, and this far end refers to a position of the casting far away from the runner (and the position of the casting close to the runner is called the proximal end), that is, the riser neck is used to connect the runner and the far end of the casting, so that the independent heat junction located at the far end of the casting can be replenished with molten metal, thereby avoiding the formation of shrinkage holes at the far end of the casting. The casting mold provided by the present invention, by adding a riser bag and a riser neck, can replenish metal liquid to the distal end of the casting, which not only avoids the occurrence of shrinkage cavities, but also eliminates the need to set up cold iron, process cores or subsidies, thereby simplifying the casting process and improving the working effect of the casting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the structure of a casting mold provided by an embodiment of the present invention;

[0017] Figure 2 for Figure 1 Left view of .

[0018] exist Figure 1 and Figure 2 middle:

[0019] 1-sprue, 2-riser package, 3-riser neck, 4-step-like structure, 5-casting, 6-proximal riser. DETAILED DESCRIPTION

[0020] The present invention provides a casting mold, which can avoid shrinkage holes on the casting by improving its structure, simplify the casting process, and improve the working effect of the casting process.

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1 and Figure 2 As shown in the figure, the arrow indicates the flow direction of the metal liquid. The casting mold provided by the embodiment of the present invention includes a runner 1 and a molding cavity. Of course, a proximal riser 6 can also be set at the position close to the runner 1. This proximal riser 6 is the existing riser for shrinkage compensation of the proximal part of the casting 5 close to the runner 1. However, the present application is mainly aimed at the independent hot junction part of the casting 5 far away from the runner 1 and prone to shrinkage holes. A distal riser consisting of a riser bag 2 and a riser neck 3 is added to the casting mold. Among them, the riser bag 2 is a structure of the distal riser that is connected to the runner 1 and is used to temporarily store the metal liquid, and the riser neck 3 is a structure of the distal riser that guides the metal liquid to the distal end of the casting 5. Specifically, the first port of the riser neck 3 is connected to the riser bag 2, and the second port is connected to the molding cavity, and the second port is opened at the distal end of the molding casting 5 in the molding cavity. This distal end is relative to the proximal end, and the proximal end refers to the part of the casting 5 close to the runner 1.

[0023] The casting mold of the above structure can effectively compensate for the shrinkage of the part of the casting 5 far away from the runner 1 that is prone to shrinkage without changing the original casting process and without increasing additional production costs and operating procedures. Specifically, by adding a riser bag 2 and a riser neck 3, it is possible to replenish the metal liquid for the part at the far end of the casting 5, thereby forming a temperature gradient at the part at the far end of the casting 5 that is prone to shrinkage. The casting 5 solidifies sequentially during the solidification process, which not only avoids the occurrence of shrinkage holes, but also eliminates the need to set up chills, process cores or subsidies. At the same time, the cleaning process is simple, without adding additional processes, which simplifies the casting process and improves the working effect of the casting process.

[0024] In order to further optimize the technical solution, in the casting mold provided in this embodiment, the riser neck 3 is a thin-sheet riser neck 3 with an inner cavity width of 4 mm to 8 mm. The thin-sheet riser neck 3 means that the inner cavity structure of the riser neck 3 is similar to the shape of a thin sheet, that is, the cross-sectional shape of the inner cavity is a rectangle, and the numerical values ​​of the length and width of the rectangle are greatly different, so as to facilitate the removal and grinding of the excess part after the casting 5 is formed. Specifically, the length of the rectangle (that is, the width of the inner cavity) is preferably 4 mm to 8 mm.

[0025] Preferably, the inner cavity of the riser neck 3 is a gradually expanding cavity that gradually expands from the first port to the second port, and the width of the first port is 4mm to 6mm, the width of the second port is 6.1mm to 8mm, and the distance between the first port and the second port is 10mm to 25mm. The selection of the above structure and numerical range is the preferred scheme of this embodiment, which is more conducive to improving the practicality of the entire casting process. While avoiding the occurrence of shrinkage cavities, it can also reduce the workload of removing and grinding the redundant parts of the casting 5 in the subsequent process, thereby improving the working effect of the casting process. More preferably, the inner cavity is a gradually expanding cavity with a trapezoidal (or approximately trapezoidal) cross-section. Under the premise of not including the step-shaped structure 4 mentioned later, the entire inner cavity can be considered to be a trapezoidal inner cavity with a more prominent working effect. The upper base of the trapezoid is the width of the first port, the lower base is the width of the second port, and the height is the distance between the first port and the second port.

[0026] More preferably, the connection trace between the edge of the second port and the inner wall of the molding cavity is a plurality of line segments connected in sequence, and the plurality of line segments are connected to form a step-like structure 4, such as Figure 2 In this embodiment, the reason why the connection trace between the second port and the inner wall of the molding cavity is preferably a plurality of line segments connected to form a stepped structure 4 is that compared with a linear connection trace, it can more effectively avoid the generation of redundant seams at the edge of the riser (this riser refers to the distal riser composed of the riser package 2 and the riser neck 3), so that the riser is easy to remove from the casting 5, and the workload of additional cleaning and grinding is not increased or only increased in a small amount.

[0027] Furthermore, there are multiple riser necks 3, which are symmetrically arranged about the vertical center line of the riser package 2, such as Figure 1 In this embodiment, one riser package 2 is connected to multiple (preferably two in this embodiment) riser necks 3 at the same time, which can maximize the number of riser necks 3, so that metal liquid can be added to the shrinkage cavities generated by more independent heat junctions at the far end of the casting 5 at the same time, significantly improving the casting quality and making the working effect of the casting mold more prominent.

[0028] In this specification, each part of the structure is described in a progressive manner, and the structure of each part focuses on the differences from the existing structure. The overall and partial structures of the casting mold can be obtained by combining the structures of the above multiple parts.

[0029] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A casting mold, comprising a runner and a molding cavity, characterized in that: It also includes a proximal riser close to the runner and a distal riser away from the runner; the distal riser includes a riser bag and a riser neck; The riser bag is in communication with the runner and is used for storing liquid metal; The first port of the riser neck is in communication with the riser package, the second port is in communication with the molding cavity, and the second port is opened at a position at the distal end of the molding casting of the molding cavity; The riser neck is a thin-sheet riser neck with an inner cavity width of 4 mm to 8 mm; The inner cavity of the riser neck is a gradually expanding cavity that gradually expands from the first port to the second port, and the width of the first port is 4 mm to 6 mm, the width of the second port is 6.1 mm to 8 mm, and the distance between the first port and the second port is 10 mm to 25 mm; The connection traces between the edge of the second port and the inner wall of the molding cavity are multiple line segments connected in sequence, and the multiple line segments are connected to form a step-like structure; There are multiple riser necks, which are symmetrically arranged about the vertical center line of the riser package.

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