Soft connection structure of sand core of motorcycle engine cylinder head casting mold
By setting a sand core structure with a conical connecting groove and an elastic asbestos sleeve in the casting mold of the motorcycle engine cylinder head, the problem of poor venting at the sand core connection is solved, achieving smooth venting and reducing the entry of molten aluminum into burrs, thus improving the casting quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQINGZHICHENG MACHINERY CO LTD
- Filing Date
- 2025-07-17
- Publication Date
- 2026-07-07
AI Technical Summary
In existing motorcycle engine cylinder head casting molds, the sand core connection cannot simultaneously ensure a small connection gap to prevent water ingress and facilitate venting, resulting in poor gas generation from the sand core during the casting process.
A connecting groove is set at the connection between the water channel sand core and the oil chamber sand core. The connector is a conical structure. An interference fit is made of a water channel sand core head sleeve made of elastic compressible asbestos to ensure a clearance fit or transition fit of the sand core. The asbestos sleeve is used to eliminate the gap to facilitate air venting.
This allows the sand core to be smoothly discharged when heated and generating gas, preventing molten aluminum from entering and forming burrs, reducing sand core size fluctuations and contact scratches, and improving casting quality.
Smart Images
Figure CN224463645U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motorcycle engine cylinder head manufacturing technology, specifically to a soft connection structure for a sand core of a motorcycle engine cylinder head casting mold. Background Technology
[0002] In the production of motorcycle engine cylinder heads, the venting of gas from the heated sand core during the casting process is a crucial step. Currently, cylinder head casting molds utilize split sand cores to create different chambers. The connections between these sand cores must have small gaps to prevent water ingress and facilitate venting, while also ensuring the gaps don't interfere with or break the sand cores. Currently, split sand cores for cylinder heads include water channel sand cores and oil chamber sand cores. The upper end of the water channel sand core is directly inserted into the cavity of the oil chamber sand core, such as... Figure 1 As shown, this connection structure cannot meet the above requirements, and therefore cannot guarantee that the gas generated by the sand core during the casting process can be smoothly discharged.
[0003] Therefore, a sand core connection structure that can facilitate the smooth venting of the sand core is needed. Summary of the Invention
[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a flexible connection structure for the sand core of a motorcycle engine cylinder head casting mold. This flexible connection structure allows the sand core to smoothly discharge gas generated when heated.
[0005] The purpose of this utility model is achieved by the following solution: a flexible connection structure for a sand core of a motorcycle engine cylinder head casting mold, including a water channel sand core and an oil chamber sand core. A connecting groove is provided at the connection between the oil chamber sand core and the water channel sand core. The connector of the water channel sand core is installed in the connecting groove. The connector of the water channel sand core is a conical structure with an upper end face diameter smaller than the lower end face diameter. A water channel sand core head sleeve is provided above the connector. The inner cavity of the water channel sand core head sleeve is a conical inner cavity that cooperates with the connector. The outer side of the water channel sand core head sleeve is a conical structure with an upper end face diameter smaller than the lower end face diameter. The connecting groove is a conical groove with a bottom diameter smaller than the opening diameter. The connecting groove and the water channel sand core head sleeve are interference fit. The water channel sand core head sleeve is made of elastic compressible asbestos.
[0006] The connection between the core head sleeve and the core of the waterway sand is a clearance fit or a transition fit.
[0007] The waterway sand core is made of pearl sand, and the oil chamber sand core is made of coated sand.
[0008] The advantages of this utility model are: 1. The gap between the sand cores is eliminated by the asbestos sleeve to prevent aluminum liquid from entering and forming burrs that affect the air venting of the sand core head in the water channel.
[0009] 2. Use asbestos flexible connections to reduce the stress interference between sand cores caused by fluctuations in sand core dimensions, which could lead to sand core breakage.
[0010] 3. The water channel sand core head sleeve reduces the contact and scratches of the oil chamber sand core during the core setting process. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the background technology structure;
[0012] Figure 2 This is a schematic diagram of the structure of this utility model;
[0013] Figure 3 This is an enlarged view of point A. Detailed Implementation
[0014] like Figures 2 to 3 As shown, a flexible connection structure for a sand core in a motorcycle engine cylinder head casting mold includes a water channel sand core 1 and an oil chamber sand core 3. A connecting groove 4 is provided at the connection between the oil chamber sand core 3 and the water channel sand core 1. A connector 5 of the water channel sand core 1 is installed in the connecting groove 4. The connector 5 of the water channel sand core 1 is a conical structure with an upper end diameter smaller than the lower end diameter. A water channel sand core head sleeve 2 is provided above the connector 5. The inner cavity of the water channel sand core head sleeve 2 is a conical inner cavity that cooperates with the connector 5. The water channel sand core head sleeve 3 and the connector 5 of the water channel sand core 1 are in clearance fit or transition fit, which facilitates the manual installation of the water channel sand core head sleeve 2 on the connector 5 of the water channel sand core 1. The outer side of the water channel sand core head sleeve 2 is a conical structure with an upper end face diameter smaller than the lower end face diameter. The connecting groove 4 is a conical groove with a bottom diameter smaller than the opening diameter. The connecting groove 4 and the water channel sand core head sleeve 3 are interference fit. The water channel sand core head sleeve 3 is made of elastic compressible asbestos to eliminate the gap between the water channel sand core 1 and the oil chamber sand core 3. The water channel sand core 1 is made of abrasive sand, and the oil chamber sand core 3 is made of coated sand.
[0015] 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 made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.
Claims
1. A flexible connection structure for a casting mold sand core of a motorcycle engine cylinder head, comprising a water channel sand core (1) and an oil chamber sand core (3), wherein a connecting groove (4) is provided at the connection between the oil chamber sand core (3) and the water channel sand core (1), and the connector (5) of the water channel sand core (1) is installed in the connecting groove (4), characterized in that: The connector (5) of the water channel sand core (1) is a conical structure with an upper end face diameter smaller than the lower end face diameter. A water channel sand core head sleeve (2) is set above the connector (5). The inner cavity of the water channel sand core head sleeve (2) is a conical inner cavity that cooperates with the connector (5). The outer side of the water channel sand core head sleeve (2) is a conical structure with an upper end face diameter smaller than the lower end face diameter. The connecting groove (4) is a conical groove with a bottom diameter smaller than the opening diameter. The connecting groove (4) and the water channel sand core head sleeve (3) are interference fit. The water channel sand core head sleeve (3) is made of elastic compressible asbestos.
2. The flexible connection structure for the sand core of the motorcycle engine cylinder head casting mold according to claim 1, characterized in that: The connection (5) between the core head sleeve (3) of the water channel sand core and the water channel sand core (1) is a clearance fit or a transition fit.
3. The flexible connection structure for the sand core of the motorcycle engine cylinder head casting mold according to claim 1, characterized in that: The waterway sand core (1) is made of pearl sand, and the oil chamber sand core (3) is made of coated sand.