Pouring system for controlling shrinkage porosity defect of gearbox casing casting

Abstract

The utility model discloses a gating system for controlling the shrinkage porosity defect of a gearbox casing casting, which comprises a casting cavity, a sprue cup cross gate and two sprues, the cross gate is positioned above the casting cavity, the bottom of the sprue cup is connected with the middle part of the upper surface of the cross gate, the number of the sprues is two, and the sprues are communicated with the sprue cup. The two straight pouring gates are located on the two sides between the casting cavity and the transverse pouring gate, the bottom of the transverse pouring gate is communicated with the casting cavity through a vertical type vertical pouring gate, and the straight pouring gates are communicated with the casting cavity through the vertical type transverse pouring gate. According to the utility model, by arranging the composite pouring system, the complex part of the casting cavity is filled and fed, so that the generation of an isolated liquid phase region in the casting cavity is avoided, and the formation of a loose defect is effectively controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of gear box casting, and in particular relates to a casting system for controlling shrinkage defects of gear box castings. Background Art

[0002] The gear box is the basic part that supports and fixes the shaft system components, ensures the normal meshing of the transmission parts, and ensures good lubrication and sealing. It has high strength and rigidity. The commonly used integral casting box has compact size, light weight, and is easy to ensure the good assembly of various parts. Therefore, the casting requirements for castings are high, and casting defects such as looseness, pores, slag inclusions, and cold shuts are not allowed.

[0003] At present, the existing pouring scheme is bottom pouring or top pouring. It is difficult to ensure a low porosity for castings with many hot nodes and uneven wall thickness. Therefore, it is necessary to improve the existing pouring system to ensure that the pouring system covers multiple nodes of the casting, ensure that the casting can obtain the shrinkage of the molten metal when solidifying, and avoid the appearance of isolated liquid phase areas inside the casting cavity. Utility Model Content

[0004] The utility model aims to provide a pouring system for controlling the shrinkage defects of a gear box casting, so as to solve the technical problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the specific technical scheme of the utility model is as follows: a casting system for controlling shrinkage defects of a gear box casting, comprising a casting cavity, a pouring cup cross runner and a straight runner, the cross runner is located above the casting cavity, the bottom of the pouring cup is connected to the middle part of the upper surface of the cross runner, two straight runners are provided, and the two straight runners are located on both sides between the casting cavity and the cross runner, the bottom of the cross runner is connected to the casting cavity through a vertical vertical runner, the straight runner is connected to the casting cavity through a vertical cross runner, and ventilation rods are provided between the two sides of the upper surface of the cross runner and the two side walls of the pouring cup.

[0006] Preferably, the casting cavity is formed according to the contour of the gear box casting, presenting a hollow circle, a rectangular bracket and a side bracket from top to bottom.

[0007] Preferably, three vertical pouring channels are provided.

[0008] Preferably, three vertical runners are provided, wherein two vertical runners are provided on the left side wall of the casting cavity, and another vertical runner is provided on the right side wall of the casting cavity.

[0009] Preferably, the width of the horizontal runner is greater than that of the vertical runner and the straight runner.

[0010] Preferably, the top end of the sprue is connected to the end of the runner.

[0011] The utility model provides a pouring system for controlling shrinkage defects of a gear box casting, which has the following advantages:

[0012] The utility model provides a composite pouring system to fill and compensate for the complex parts of the casting cavity, thereby preventing the generation of isolated liquid phase areas in the casting cavity and effectively controlling the formation of porosity defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a connection diagram of the sprue and the runner in the utility model;

[0016] Explanation of markings in the figure: 1. Casting cavity; 2. Pouring cup; 3. Ventilation rod; 4. Horizontal runner; 5. Straight runner; 6. Vertical vertical runner; 7. Vertical horizontal runner. DETAILED DESCRIPTION

[0017] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0018] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", 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 the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0020] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, 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 utility model can be understood according to specific circumstances.

[0021] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0022] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of a pouring system for controlling shrinkage defects of a gear box casting of the utility model in conjunction with the accompanying drawings.

[0023] like Figure 1-2As shown, a pouring system for controlling shrinkage defects of a gear box casting of the utility model comprises a casting cavity 1, a pouring cup 2, a runner 4 and a straight runner 5. The casting cavity 1 is formed according to the contour of the gear box casting, and presents a hollow circle, a rectangular bracket and a side bracket from top to bottom. The casting cavity 1 is made of a mullite shell. After the molten metal is injected into the casting cavity 1 and cooled, it becomes a gear box casting. The runner 4 is located above the casting cavity 1, the bottom of the pouring cup 2 is connected to the middle part of the upper surface of the runner 4, two straight runners 5 are provided, and the two straight runners 5 are located on both sides between the casting cavity 1 and the runner 4, the top of the runner 5 is connected to the end of the runner 4, the bottom of the runner 4 is connected to the casting cavity 1 through a vertical vertical runner 6, three vertical vertical runners 6 are provided, the runner 5 is connected to the casting cavity 1 through a vertical horizontal runner 7, three vertical horizontal runners 7 are provided, two of which are provided at the casting cavity On the left side wall of cavity 1, another vertical cross runner 7 is arranged on the right side wall of casting cavity 1. Through the coordination between cross runner 4, straight runner 5, vertical vertical runner 6 and vertical cross runner 7, it is ensured that molten metal fills and shrinks the casting from multiple positions, avoids the formation of isolated liquid phase area in casting cavity 1, and reduces the occurrence of loose defects. The width of cross runner 4 is greater than that of vertical vertical runner 6 and straight runner 5. Ventilation rods 3 are arranged between the upper surfaces of cross runner 4 and the two side walls of pouring cup 2. Ventilation rods 3 ensure that more molten metal enters cross runner 4 at the same time.

[0024] When in use, the molten metal is poured into the pouring cup 2, and the metal liquid enters the cross runner 4 through the pouring cup 2 and the vent rod 3. Part of the metal liquid flows from the cross runner 4 into the vertical vertical runner 6, and then is injected into the casting cavity 1 from the top; part of the metal liquid flows into the straight runner 5 through the cross runner 4, and is injected into the casting cavity 1 from the side through the vertical cross runner 7. The casting cavity 1 is filled and compensated for shrinkage through the pouring system, thereby avoiding the formation of isolated liquid phase areas in the casting cavity when the casting solidifies.

[0025] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A pouring system for controlling shrinkage defects of gear box castings, characterized in that: It comprises a casting cavity (1), a pouring cup (2), a runner (4) and a sprue (5), wherein the runner (4) is located above the casting cavity (1), the bottom of the pouring cup (2) is connected to the middle part of the upper surface of the runner (4), two sprues (5) are provided, and the two sprues (5) are located on both sides between the casting cavity (1) and the runner (4), the bottom of the runner (4) is connected to the casting cavity (1) via a vertical vertical runner (6), the sprue (5) is connected to the casting cavity (1) via a vertical runner (7), and ventilation rods (3) are provided between the upper surfaces of the runner (4) and the two side walls of the pouring cup (2).

2. A gating system for controlling shrinkage defects of gear box castings according to claim 1, characterized in that: The casting cavity (1) is formed according to the outline of the gear box casting, and presents a hollow circle, a rectangular bracket and a side bracket from top to bottom.

3. A gating system for controlling shrinkage defects of gear housing castings according to claim 1, characterized in that: The vertical pouring channels (6) are provided in three numbers.

4. A gating system for controlling shrinkage defects of gear housing castings according to claim 1, characterized in that: The vertical runners (7) are provided in three numbers, two of which are provided on the left side wall of the casting cavity (1), and the other vertical runner (7) is provided on the right side wall of the casting cavity (1).

5. A gating system for controlling shrinkage defects of gear box castings according to claim 1, characterized in that: The width of the horizontal runner (4) is greater than that of the vertical vertical runner (6) and the straight runner (5).

6. A gating system for controlling shrinkage defects of gear housing castings according to claim 1, characterized in that: The top end of the sprue (5) is connected to the end of the runner (4).

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