Low-pressure casting pouring system for aluminum alloy cylinder cover

Abstract

The utility model discloses an aluminum alloy cylinder cover low-pressure casting pouring system which comprises a cylinder cover sand mold, a combustion chamber is arranged on a forming part of the cylinder cover sand mold, the cylinder cover sand mold is provided with a straight pouring gate and a transverse pouring gate, an inner pouring gate is arranged at the top of the combustion chamber of the cylinder cover sand mold, and a forming chilling block is embedded in the combustion chamber. According to the utility model, the advantages of low-pressure casting are fully utilized, and a good casting feeding effect is achieved under the pressure; meanwhile, the pouring system is used in cooperation with the embedded forming chilling block, sequential solidification of the casting is well achieved in the solidification process, and shrinkage porosity of the position of the combustion chamber is avoided.

Description

Technical Field

[0001] The utility model relates to a low-pressure casting pouring system for an aluminum alloy cylinder head, belonging to the field of casting technology. Background Art

[0002] With the continuous innovation and development of engine technology in the automotive industry, the supporting parts are also constantly updated. Especially for the cylinder head, which is a core part of the engine, the design of new cylinder head structures and functions is constantly changing. With the cost control of new products by vehicle manufacturers and the shortening of the development cycle, rapid prototyping 3D sand mold printing is selected to realize the development of new products.

[0003] In the low-pressure casting method, the filling of molten metal is relatively stable, and the formability of castings is good, which is beneficial to forming castings with clear contours and good surface finish. The castings are formed under pressure with dense structures and high mechanical properties, and have the advantages of simple equipment, low cost, and small investment.

[0004] However, in the prior art, when using 3D printing sand mold casting for cylinder head products, problems such as shrinkage porosity and leakage often occur in the combustion chamber, resulting in product scrapping, low yield, and affecting the delivery schedule.

[0005] Therefore, we propose a low-pressure casting pouring system for an aluminum alloy cylinder head. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a low-pressure casting pouring system for an aluminum alloy cylinder head, which fully utilizes the advantages of low-pressure casting, plays a good role in feeding the castings under pressure, and realizes sequential solidification to avoid the occurrence of shrinkage porosity at the combustion chamber position.

[0007] To solve the above technical problems, the utility model adopts the following technical scheme: a low-pressure casting pouring system for an aluminum alloy cylinder head, including a cylinder head sand mold. A combustion chamber is provided in the forming part of the cylinder head sand mold. The cylinder head sand mold is provided with a sprue and a runner. An ingate is arranged at the top of the cylinder head sand mold at the position of the combustion chamber, and a forming chill is embedded in the combustion chamber.

[0008] In the aforementioned low-pressure casting pouring system for an aluminum alloy cylinder head, the ingate extends from the top of the combustion chamber to the surface of the cylinder head sand mold.

[0009] In the aforementioned low-pressure casting pouring system for an aluminum alloy cylinder head, the forming chill includes a conical part and a frustum part. The tip of the conical part extends towards the center position of the combustion chamber. The platform end of the conical part is fixed at the small-diameter end of the frustum part, and the large-diameter end of the frustum part is embedded in the cylinder head sand mold.

[0010] In the aforementioned low-pressure casting pouring system for an aluminum alloy cylinder head, the taper of the frustum part is greater than the taper of the conical part.

[0011] For the aforementioned low-pressure casting gating system of an aluminum alloy cylinder head, a coating layer is provided on the surface of the conical portion of the shaped chill.

[0012] For the aforementioned low-pressure casting gating system of an aluminum alloy cylinder head, the coating layer is a zircon powder coating.

[0013] For the aforementioned low-pressure casting gating system of an aluminum alloy cylinder head, the shaped chill is made of low-carbon steel.

[0014] Compared with the prior art, the gating system of the present utility model makes full use of the advantages of low-pressure casting and plays a good role in feeding the casting under pressure; at the same time, by using the cooperation of the gating system and the inlaid shaped chill, the casting realizes sequential solidification well during the solidification process, avoiding the occurrence of shrinkage porosity at the combustion chamber position; the present utility model effectively reduces the possibility of product rejection and greatly improves the finished product rate. Brief Description of the Drawings

[0015] Figure 1 is a schematic diagram of the outer surface structure of the casting after being formed according to the present utility model;

[0016] Figure 2 is an internal sectional view of the present utility model;

[0017] Figure 3 is a three-dimensional view of the shaped chill of the present utility model.

[0018] Reference Numerals: 1 - cylinder head sand mold, 2 - combustion chamber, 3 - inner runner, 4 - shaped chill, 5 - conical portion, 6 - frustum portion, 7 - casting.

[0019] The following further describes the present utility model in conjunction with the drawings and specific embodiments. Specific Embodiments

[0020] Embodiment 1 of the present utility model: A low-pressure casting gating system for an aluminum alloy cylinder head includes a cylinder head sand mold 1. The forming portion of the cylinder head sand mold 1 is provided with a combustion chamber 2. The cylinder head sand mold 1 is provided with a sprue and a cross runner. An inner runner 3 is provided at the top of the cylinder head sand mold 1 at the position of the combustion chamber 2, and a shaped chill 4 is inlaid in the combustion chamber 2.

[0021] During the casting process, the combustion chamber 2 is thick and large in size and cools and solidifies slowly. An inner runner 3 is added at the position of the combustion chamber 2. The diameter of the inner runner 3 can be designed by the hot spot circle method, so as to ensure that the combustion chamber 2 is fully fed under the pressure of the inner runner 3 during the solidification process of the casting 7; at the same time, by using the cooperation with the inlaid shaped chill 4, the casting 7 realizes sequential solidification well during the solidification process, avoiding the occurrence of shrinkage porosity at the combustion chamber position.

[0022] Embodiment 2 of the present utility model: A low-pressure casting pouring system for an aluminum alloy cylinder head, comprising a cylinder head sand mold 1, wherein a forming portion of the cylinder head sand mold 1 is provided with a combustion chamber 2, wherein the cylinder head sand mold 1 is provided with a straight runner and a cross runner, wherein an endocastor 3 is provided at the top of the cylinder head sand mold 1 at the combustion chamber 2, wherein the endocastor 3 extends from the top of the combustion chamber 2 to the surface of the cylinder head sand mold 1 to facilitate casting, wherein a molded chill 4 is inlaid in the combustion chamber 2.

[0023] Among them, the formed cold iron 4 includes a conical portion 5 and a truncated cone portion 6. The tip of the conical portion 5 extends toward the center of the combustion chamber 2. The platform end of the conical portion 5 is fixed to the small diameter end of the truncated cone portion 6. The large diameter end of the truncated cone portion 6 is embedded in the cylinder head sand mold 1. The truncated cone portion 6 is convenient for embedding and installation. The conical portion 5 plays a chilling role to improve the casting quality.

[0024] Embodiment 3 of the present utility model: A low-pressure casting pouring system for an aluminum alloy cylinder head, comprising a cylinder head sand mold 1, wherein the forming portion of the cylinder head sand mold 1 is provided with a combustion chamber 2, the cylinder head sand mold 1 is provided with a straight runner and a cross runner, the cylinder head sand mold 1 is provided with an endocastor 3 at the top of the combustion chamber 2, the endocastor 3 extends from the top of the combustion chamber 2 to the surface of the cylinder head sand mold 1 to facilitate casting, and the combustion chamber 2 is inlaid with a molded chill 4.

[0025] Among them, the molded chill 4 includes a conical portion 5 and a truncated cone portion 6, the tip of the conical portion 5 extends toward the center of the combustion chamber 2, the platform end of the conical portion 5 is fixed to the small diameter end of the truncated cone portion 6, and the large diameter end of the truncated cone portion 6 is embedded in the cylinder head sand mold 1. The taper of the truncated cone portion 5 is greater than the taper of the conical portion 5, and the truncated cone portion 6 is convenient for embedding and installation. The conical portion 5 plays a chilling role to improve the casting quality. The surface of the conical portion 5 of the molded chill 4 is provided with a coating layer, and the coating layer is a zircon powder coating, which can effectively prevent the casting 7 from sticking to the conical portion 5, thereby causing great difficulty in subsequent cleaning. The molded chill 4 is made of low carbon steel.

[0026] The working principle of an embodiment of the utility model: during the casting process of the utility model, since the combustion chamber 2 is thick and the cooling and solidification are slow, an endogate 3 is added at the combustion chamber 2. The diameter of the endogate 3 can be designed by the hot pitch circle method, so that the endogate 3 can ensure that the combustion chamber 2 is fully compensated for shrinkage under the action of pressure during the solidification of the casting 7; at the same time, when used in conjunction with the inlaid molding cold iron 4, the casting 7 achieves a good sequential solidification during the solidification process, avoiding the shrinkage of the combustion chamber.

Claims

1. A low-pressure casting gating system for an aluminum alloy cylinder head, comprising a cylinder head sand mold (1), a combustion chamber (2) is provided in the forming part of the cylinder head sand mold (1), the cylinder head sand mold (1) is provided with a sprue and a runner, and it is characterized in that, At the top of the cylinder head sand mold (1) at the combustion chamber (2), there is a sprue (3), and a formed chill (4) is embedded in the combustion chamber (2).

2. The low-pressure casting gating system for an aluminum alloy cylinder head according to claim 1, characterized in that, The sprue (3) extends from the top of the combustion chamber (2) to the surface of the cylinder head sand mold (1).

3. The low-pressure casting gating system for an aluminum alloy cylinder head according to claim 2, wherein, The formed chill (4) includes a conical part (5) and a frustum part (6). The tip of the conical part (5) extends towards the center position of the combustion chamber (2). The platform end of the conical part (5) is fixed to the small-diameter end of the frustum part (6), and the large-diameter end of the frustum part (6) is embedded in the cylinder head sand mold (1).

4. The low-pressure casting gating system for an aluminum alloy cylinder head according to claim 3, wherein, The taper of the frustum part (6) is greater than the taper of the conical part (5).

5. A low-pressure casting gating system for an aluminum alloy cylinder head according to claim 4, characterized in that A coating layer is provided on the surface of the conical part (5) of the formed chill (4).

6. The low-pressure casting gating system for an aluminum alloy cylinder head according to claim 5, wherein, The coating layer is a zircon powder coating.

7. A low-pressure casting gating system for an aluminum alloy cylinder head according to claim 1 or 6, characterized in that, The formed chill (4) is made of low-carbon steel.

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