Feeding-free top pouring type pouring system for heavy-load engine cylinder cover

Abstract

The utility model relates to the field of pouring systems, in particular to a feeding-free top pouring type pouring system for a heavy-load engine cylinder cover. The casting device comprises a casting cavity and a pouring system arranged on the side edge of the casting cavity. The pouring system comprises a pouring cup arranged on the side edge of the casting cavity, a transverse pouring gate flowing towards the two sides along the bottom of the pouring cup, a vertical pouring gate arranged upwards along the transverse pouring gate and a transverse pouring gate communicated with the vertical pouring gate and arranged horizontally and transversely. The plurality of runners are communicated with the cross gate and are arranged above the casting cavity; and the flow gates are respectively communicated with the casting cavity. The pouring system has the beneficial effects that the special runner is arranged, molten iron flows to the lowest end from the height and then flows to the topmost end of a casting, and the pouring system automatically filters and purifies the molten iron in the flowing process of the molten iron, so that impurities, dirt and the like are prevented from entering a cavity, and the molten iron stably and slowly enters the cavity; and defects such as sand, slag holes and the like on any appearance are not caused.

Description

Technical Field

[0001] This invention relates to the field of casting systems, and particularly to a top-injection casting system for heavy-duty engine cylinder heads that does not require shrinkage compensation. Background Technology

[0002] Cylinder heads, with their complex structure and thin walls, have always been a challenging problem in engine production, especially for heavy-duty engines. Due to the high power output and harsh operating conditions of these engines, the requirements for materials and mechanical properties are extremely high.

[0003] The existing technology, CN202110474393.X, describes a gating system for anti-shrinkage holes in a high-grade vermicular graphite cast iron cylinder head. The existing cylinder head weighs 130kg and has an average wall thickness of 5mm. To meet the load requirements, the material is required to be HT300. The casting must not have internal or external defects such as shrinkage porosity or sand holes. Because the casting has a large weight and a relatively thin overall wall thickness, there are large isolated hot spots in the bolt holes and spark plug areas where the wall thickness is relatively thick, which can easily lead to shrinkage porosity and other problems.

[0004] Therefore, it is necessary to design a top-injection casting system for heavy-duty engine cylinder heads that does not require compensation to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a top-injection casting system for heavy-duty engine cylinder heads that does not require shrinkage compensation, in order to overcome the aforementioned shortcomings of the existing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A top-fill casting system for a heavy-duty engine cylinder head, comprising a casting cavity and a casting system disposed on the side of the casting cavity, characterized in that: the casting system includes a pouring cup disposed on the side of the casting cavity, a horizontal runner flowing from the bottom of the pouring cup to both sides, a vertical runner disposed upward along the horizontal runner, a horizontal runner connected to the vertical runner and disposed horizontally, a plurality of flow channels connected to the horizontal runner and disposed above the casting cavity, and an inner gate respectively connected to the flow channels and connected to the casting cavity, wherein the inner gate is vertically disposed above the casting cavity.

[0008] Preferably, the horizontal runner has a T-shaped structure, and the flow channel area of ​​the horizontal runner is larger than that of the vertical runner and the flow channel.

[0009] Preferably, the ingate is inverted conical in shape, and the draft angle of the inverted conical shape is 5 degrees.

[0010] Preferably, a number of overflow holes are provided at the top of the casting cavity.

[0011] The beneficial effects of this utility model are as follows: This technical solution, by setting up a special flow channel, allows molten iron to flow from the lowest point of the casting and then climb to the top of the casting. Ultimately, without the use of filters or other measures, the pouring system automatically filters and purifies the molten iron during its flow, preventing impurities and dirt from entering the mold cavity. This allows the molten iron to enter the cavity calmly and slowly, without causing any external defects such as holes or slag inclusions. The flow path directly passes over the riser, saving space while providing sufficient heat to the riser, ensuring that the riser can effectively feed the casting and thus avoiding internal defects such as shrinkage porosity. Ultimately, this results in a highly dense casting with uniform structure and properties. Attached Figure Description

[0012] Figure 1 This is a system diagram of a heavy-duty engine cylinder head non-compensating top-injection casting system according to this utility model;

[0013] Figure 2 Top view of a top-injection casting system for a heavy-duty engine cylinder head that does not require shrinkage compensation;

[0014] In the diagram: 1. Sprue cup, 2. Horizontal runner, 3. Vertical runner, 4. Horizontal runner, 5. Flow path, 6. Casting cavity, 7. Overflow hole; 8. Ingate. Detailed Implementation

[0015] Reference Figure 1 and Figure 2 A heavy-duty engine cylinder head non-compensation top-injection gating system includes a casting cavity 6 and a gating system located on the side of the casting cavity 6;

[0016] The gating system includes a pouring cup 1 disposed on the side of the casting cavity 6, a horizontal runner 2 flowing from the bottom of the pouring cup 1 to both sides, a vertical runner 3 disposed upward along the horizontal runner 2, a horizontal runner 4 connected to the vertical runner 3 and disposed horizontally, a plurality of flow channels 5 connected to the horizontal runner 4 and positioned above the casting cavity 6, and an inner gate 8 that is connected to the flow channels and to the casting cavity 6.

[0017] The horizontal runner 4 has a T-shaped structure, which facilitates the connection of the runner 5 with the casting cavity 6 at different positions; and the horizontal runner 4 adopts a runner with a large volume and area, and is located in the bolt hole or spark plug hole with a large hot spot to realize the feeding of the gating system.

[0018] The ingate 8 is vertically positioned above the casting cavity 6 and is in the shape of an inverted cone with a draft angle of 5 degrees. The ingate 8 is located at the top of the casting, ensuring that the uppermost layer of molten iron remains at a high level during the final filling stage, preventing crust formation and allowing gases generated during sand core combustion to escape.

[0019] Several sets of overflow holes 7 are provided at the top of the casting cavity 6. The more overflow holes 7, the dirtier gas and slag in the molten iron are discharged, so as to avoid the formation of hole-like defects.

[0020] Molten iron rises to the top of the casting through the horizontal sprue 2, vertical sprue 3, horizontal sprue 4, and runner 5, reducing the kinetic energy of the molten iron as it flows down and preventing excessive impact that could damage the sand core and cause sand holes.

[0021] The advantages of this invention lie in its specially designed flow channel. Molten iron flows from the lowest point of the casting and then ascends to the top. Without the need for filters or similar measures, the gating system automatically filters and purifies the molten iron during its flow, preventing impurities and contaminants from entering the mold cavity. This allows the molten iron to enter the cavity calmly and slowly, preventing any visible defects such as pinholes or slag inclusions. The flow path directly passes over the riser, saving space while providing sufficient heat to ensure effective feeding of the casting and preventing internal defects such as shrinkage porosity. Ultimately, this results in a highly dense casting with uniform structure and properties.

[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A top-fill casting system for a heavy-duty engine cylinder head, comprising a casting cavity and a casting system disposed on the side of the casting cavity, characterized in that: The gating system includes a pouring cup disposed on the side of the casting cavity, a horizontal runner flowing from the bottom of the pouring cup to both sides, a vertical runner disposed upward along the horizontal runner, a horizontal runner connected to the vertical runner and disposed horizontally, a plurality of flow channels connected to the horizontal runner and disposed above the casting cavity, and an ingate that is connected to the flow channels and connected to the casting cavity, wherein the ingate is disposed vertically above the casting cavity.

2. The heavy-duty engine cylinder head non-feeding top-pouring casting system according to claim 1, characterized in that: The horizontal runner has a T-shaped structure, and the flow channel area of ​​the horizontal runner is larger than that of the vertical runner and the flow channel.

3. The heavy-duty engine cylinder head non-feeding top-pouring casting system according to claim 1, characterized in that: The ingate is inverted conical in shape, and the draft angle of the inverted conical shape is 5 degrees.

4. The heavy-duty engine cylinder head non-feeding top-pouring casting system according to claim 1, characterized in that: Several sets of overflow holes are provided at the top of the casting cavity.

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