A mold for eliminating casting defects of a speed reducer case

Abstract

The application discloses a mold for eliminating casting defects of a speed reducer box, which comprises an upper core, a lower core, an upper mold outer shape, a lower mold outer shape and a pouring system; the upper core and the lower core are combined and arranged in the interiors of the upper mold outer shape and the lower mold outer shape and extend out from the first direction two sides of the upper mold outer shape and the lower mold outer shape; the pouring system is connected with the second direction two sides of the lower mold outer shape and is used for pouring molten iron into the interiors of the upper mold outer shape and the lower mold outer shape; a large shaft hole of the upper mold outer shape is internally provided with an upward extending feeding riser, and the interiors of the upper core and the lower core are upwardly led out with air guiding ropes to pass through the upper mold outer shape, the pouring system designed in the application can effectively block slag, avoids the risk of slag inclusion, the formed casting will not appear shrinkage holes through the setting of the feeding riser, and the formed casting will not appear air holes through the setting of the air guiding ropes and the air outlet rods, compared with the prior art, the defective product rate is greatly reduced, the production needs of enterprises can be met, and the mold has high use value.

Description

Technical Field

[0001] This utility model relates to the field of casting mold technology, and specifically discloses a mold for eliminating casting defects in gearboxes. Background Technology

[0002] Casting is a manufacturing process in which molten metal is poured into a mold and then cooled and solidified to obtain parts with the desired shape and properties. Casting is a commonly used manufacturing method and is widely used in automobile manufacturing, especially in the production of gearboxes.

[0003] Currently, the casting molds used for casting gearboxes in existing technologies cannot effectively prevent slag from entering the gating system, which poses a risk of slag inclusion. Furthermore, the resulting castings may have porosity or shrinkage cavities, resulting in a high defect rate and failing to meet the production needs of enterprises.

[0004] To address the aforementioned problems, this application discloses a mold for eliminating casting defects in gearboxes. Utility Model Content

[0005] To overcome the shortcomings of the existing technology, this utility model discloses a mold for eliminating casting defects in gearboxes.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a mold for eliminating casting defects in a gearbox, comprising an upper core, a lower core, an upper mold shape, a lower mold shape, and a gating system;

[0007] The upper and lower cores are combined and arranged inside the upper and lower mold shapes and extend out from both sides of the upper and lower mold shapes in a first direction;

[0008] The gating system is connected to the second direction sides of the lower mold shape for pouring molten iron into the interior of the upper mold shape and the lower mold shape;

[0009] The upper mold has an upward-extending feeding riser inside the large shaft hole. Air ducts extend upward from the upper and lower cores and pass through the upper mold. Several air vents extend from the upper mold.

[0010] More preferably, the outer periphery of the upper mold shape and the lower mold shape is provided with several first chills.

[0011] More preferably, the large shaft hole of the lower mold shape is provided with several second chills.

[0012] More preferably, the gating system includes a sprue, a U-shaped runner, and at least two ingates. The U-shaped runner surrounds the outside of the lower mold shape, the sprue is connected above the U-shaped runner, and the at least two ingates are respectively connected to the inside of the U-shaped runner on both sides and extend into the inside of the lower mold shape.

[0013] More preferably, the inner side of the U-shaped horizontal runner is connected to several ingates.

[0014] This utility model achieves the following beneficial effects:

[0015] The gating system designed in this application can effectively block slag, avoiding the risk of slag inclusion. Furthermore, by setting feeding risers, the resulting castings will not have shrinkage cavities, and by setting air wicking ropes and air venting rods, the finished castings will not have porosity. Compared with existing technologies, the defect rate is greatly reduced, which can meet the production needs of enterprises and has high application value.

[0016] Other features and advantages of this invention will be set forth in the following description and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the specification, serve to explain the principles of the disclosure.

[0018] Figure 1 This is a schematic diagram of the overall structure disclosed in this utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure disclosed in this utility model;

[0020] In the diagram: 10. Upper core; 20. Lower core; 30. Upper mold shape; 40. Lower mold shape; 50. Gating system; 51. Vertical sprue; 52. U-shaped horizontal sprue; 53. Ingate; 60. Shrinkage riser; 70. Air vent rope; 80. Air venting rod; 90. First chill; 100. Second chill. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements 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.

[0023] Example

[0024] To address the problems in existing molds used for casting gearbox housings, such as the inability of the gating system to effectively prevent slag inclusions, leading to porosity or shrinkage cavities in the resulting castings and a high defect rate, this paper refers to... Figure 1 and Figure 2 As shown, this application discloses a mold for eliminating casting defects in a gearbox, including an upper core 10, a lower core 20, an upper mold shape 30, a lower mold shape 40, and a gating system 50;

[0025] The upper core 10 and the lower core 20 are combined and arranged inside the upper mold shape 30 and the lower mold shape 40 and extend out from both sides of the upper mold shape 30 and the lower mold shape 40 in the first direction;

[0026] The gating system is connected to the second direction sides of the lower mold outer shape 40 for pouring molten iron into the interior of the upper mold outer shape 30 and the lower mold outer shape 40;

[0027] The upper mold outer shape 30 has an upwardly extending feeding riser 60 inside the large shaft hole. The upper core 10 and the lower core 20 have air-guiding ropes 70 extending upward through the upper mold outer shape 30. Several air-venting rods 80 are provided on the upper mold outer shape 30.

[0028] In practice, the upper core 10 and lower core 20 are combined and placed inside the upper mold 30 and lower mold 40 and then closed. The feeding riser 60, several venting ropes 70, and several venting rods 80 are placed in the designated positions. Then, molten iron is poured from both sides of the lower mold 40 through the gating system until the set amount is poured. During this process, the feeding riser 60 feeds the large shaft hole to prevent shrinkage cavities in the casting. The venting ropes 70 vent the upper core 10 and lower core 20 respectively, and the several venting rods 80 vent the casting itself. In this way, the casting will not have shrinkage cavities or porosity. After the casting is formed, the upper mold 30 is opened and the upper core 10 and lower core 20 are removed.

[0029] To ensure the quality of the final casting, this application provides several first chills 90 around the outer periphery of the upper mold outer shape 30 and the lower mold outer shape 40. To ensure that the shaft hole at the lower mold outer shape 40 does not shrink, this application also provides several second chills 100 inside the large shaft hole of the lower mold outer shape 40.

[0030] In one embodiment, the gating system of this application includes a sprue, a U-shaped horizontal sprue 52, and at least two ingates 53. The U-shaped horizontal sprue 52 surrounds the exterior of the lower mold 40, the sprue is connected above the U-shaped horizontal sprue 52, and the at least two ingates 53 are respectively connected to the inner sides of the U-shaped horizontal sprue 52 and extend into the interior of the lower mold 40. In specific implementation, molten iron enters the U-shaped horizontal sprue 52 through the vertical sprue 51 and enters the interior of the lower mold 40 and the upper mold 30 through the ingates 53 on both sides of the U-shaped horizontal sprue 52, and then cooperates with the upper core 10 and the lower core 20 to form a casting.

[0031] To improve the pouring speed, this application has several ingates 53 connected to the inner side of the U-shaped horizontal runner 52.

[0032] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A mold for eliminating casting defects in a gearbox, characterized in that, It includes an upper core (10), a lower core (20), an upper mold shape (30), a lower mold shape (40), and a gating system (50); The upper core (10) and lower core (20) are combined and arranged inside the upper mold outer shape (30) and the lower mold outer shape (40) and extend out from both sides of the upper mold outer shape (30) and the lower mold outer shape (40) in a first direction; The gating system is connected to the second direction sides of the lower mold outer shape (40) for pouring molten iron into the interior of the upper mold outer shape (30) and the lower mold outer shape (40); The upper mold outer shape (30) has an upwardly extending feed riser (60) inside the large shaft hole. The upper core (10) and lower core (20) have air-guiding ropes (70) extending upward through the upper mold outer shape (30). Several air-venting rods (80) are provided on the upper mold outer shape (30).

2. The mold for eliminating casting defects in a gearbox according to claim 1, characterized in that, Several first chills (90) are provided on the outer periphery of the upper mold shape (30) and the lower mold shape (40).

3. The mold for eliminating casting defects in a gearbox according to claim 1, characterized in that, Several second chills (100) are provided inside the large shaft hole of the lower mold outer shape (40).

4. The mold for eliminating casting defects in a gearbox according to claim 1, characterized in that, The gating system includes a sprue, a U-shaped runner (52), and at least two ingates (53). The U-shaped runner (52) surrounds the outside of the lower mold shape (40). The sprue is connected above the U-shaped runner (52). The at least two ingates (53) are respectively connected to the inside sides of the U-shaped runner (52) and extend into the inside of the lower mold shape (40).

5. The mold for eliminating casting defects in a gearbox according to claim 4, characterized in that, Several ingates (53) are connected to the inner side of the U-shaped horizontal runner (52).

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