Novel molten iron feeding structure with overhead riser of cylinder cover
By designing a top riser structure for molten iron inlet in the cylinder head, the problems of shrinkage and porosity in cylinder head production were solved, improving feeding efficiency and yield, and reducing processing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LAIYANG DACHAI AUTOMOBILE CYLINDER HEAD CO LTD
- Filing Date
- 2025-05-14
- Publication Date
- 2026-04-28
AI Technical Summary
The existing side-pouring or bottom-pouring process in cylinder head production easily leads to shrinkage cavities and porosity at hot joints, resulting in large riser volumes and low molten iron utilization, and the process is complex and increases processing costs.
A novel cylinder head top riser molten iron inlet structure is adopted, including the design of top molten iron inlet riser, connecting channel, horizontal runner and vertical runner, forming a composite flow path, reducing riser volume and compensating for hot spots through top molten iron inlet riser.
It effectively reduces shrinkage defects, improves feeding efficiency, reduces riser volume by 50%-60%, increases yield, and reduces processing costs.
Smart Images
Figure CN224168688U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cylinder head manufacturing technology, and in particular to a novel cylinder head top riser inlet molten iron structure. Background Technology
[0002] Existing side-pouring or bottom-pouring processes have long feeding paths, which easily lead to shrinkage cavities and porosity at hot spots. The risers are large, resulting in low molten iron utilization; in traditional processes, risers account for 30%-40% of the molten iron. The process is complex, requiring additional process holes and increasing manufacturing costs. Therefore, a novel cylinder head top-mounted riser molten iron inlet structure is needed to solve these problems. Utility Model Content
[0003] The purpose of this utility model embodiment is to provide a novel cylinder head top riser molten iron inlet structure, which is suitable for casting production of materials such as gray cast iron, vermicular graphite cast iron, and ductile iron.
[0004] This utility model embodiment is implemented as follows: a novel cylinder head top riser molten iron inlet structure includes: a cylinder head casting, the cylinder head casting having a cavity for cylinder head forming; a top molten iron inlet riser, which is fixedly installed on the cylinder head casting, the molten iron outlet end of the top molten iron inlet riser being connected to a connecting channel, the connecting channel being connected to a horizontal sprue installed on the cylinder head casting, the horizontal sprue communicating with the cavity; and a sprue, which is installed on the cylinder head casting and communicates with the top molten iron inlet riser, the cavity communicating with the sprue.
[0005] Preferably, the cross-sectional shape of the top molten iron riser is trapezoidal.
[0006] The novel cylinder head top riser molten iron inlet structure provided by this utility model can compensate for the shrinkage of hot sections, reduce shrinkage defects, improve the feeding efficiency, reduce the riser volume by 50%-60%, improve the yield, and is highly practical. Attached Figure Description
[0007] Figure 1 This is a schematic diagram of a new type of cylinder head with a top riser for molten iron inlet.
[0008] In the attached diagram: 1-Cylinder head casting, 2-Cavity, 3-Top molten iron inlet riser, 4-Connecting channel, 5-Horizontal sprue, 6-Vertical sprue. Detailed Implementation
[0009] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and do not limit the present utility model.
[0010] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.
[0011] Please see Figure 1 This utility model provides a novel cylinder head top riser molten iron inlet structure, which includes:
[0012] A cylinder head casting 1, wherein the cylinder head casting 1 is provided with a cavity 2 for forming the cylinder head; a top molten iron inlet riser 3, which is fixedly installed on the cylinder head casting 1, and the molten iron outlet end of the top molten iron inlet riser is connected to a connecting channel 4, and a horizontal sprue 5 installed on the cylinder head casting 1 is connected to the connecting channel 4, the horizontal sprue 5 is connected to the cavity 2; and a sprue 6, which is installed on the cylinder head casting 1 and connected to the top molten iron inlet riser 3, and the cavity 2 is connected to the sprue 6.
[0013] like Figure 1 As shown in the preferred embodiment of this utility model, the cross-sectional shape of the top molten iron inlet riser 3 is trapezoidal.
[0014] The top-mounted molten iron riser 3 is integrated with the gating system. The top-mounted molten iron riser 3 is vertically positioned in the hot spot area at the top of the cylinder head casting 1. The cross-section of the top-mounted molten iron riser 3 adopts a trapezoidal structure (e.g., 25*50*175mm). The top-mounted molten iron riser 3 is connected to the horizontal runner 5 through the connecting channel 4. The horizontal runner 5 is connected to the mold cavity. It supplements heat throughout the pouring process and prolongs the solidification time. After pouring is completed, the connecting channel between the horizontal runner 5 and the top-mounted molten iron riser 3 solidifies first. The molten iron channel of the horizontal runner 5 is then closed. Then, the hot spot is directly fed through the top-mounted molten iron riser 3, which reduces shrinkage defects, improves feeding efficiency, and reduces the riser volume by 50%-60%.
[0015] In addition, the molten iron pouring temperature is controlled at 1410-1430℃, and the filling tangential speed is <1.2m / s to avoid turbulence and oxidation. The horizontal parting mold is adopted, and the design of the straight sprue 6 and the horizontal sprue 5 connected with the top molten iron riser 3 forms a "top pouring-side filling" composite flow path, which improves the feeding efficiency.
[0016] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A novel cylinder head top riser inlet molten iron structure, comprising a cylinder head casting, characterized in that, The cylinder head casting has a cavity for forming the cylinder head; A top molten iron inlet riser is fixedly installed on the cylinder head casting. The molten iron outlet end of the top molten iron inlet riser is connected to a connecting channel. A horizontal sprue installed on the cylinder head casting is connected to the connecting channel. The horizontal sprue communicates with the mold cavity. The sprue is installed on the cylinder head casting and is connected to the top molten iron riser. The mold cavity is connected to the sprue.
2. The novel cylinder head top riser inlet molten iron structure according to claim 1, characterized in that, The cross-sectional shape of the top molten iron riser is trapezoidal.