Anti-suffocation sprue cup sand core structure
By designing inner and outer ring sand cores, venting gaps and flow guiding cavities are formed, solving the problem that gas cannot be discharged in time during the pouring process, thus improving the fluidity of the molten metal and the qualification rate of castings.
Patent Information
- Application Number
- CN202520196184.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-02-08
AI Technical Summary
If the gas generated during the pouring process cannot be discharged in time, the molten metal will not flow smoothly, resulting in porosity and incomplete pouring, which will affect the qualification rate of the casting.
The structure adopts an inner and outer sand core design. The inner sand core forms a cavity that communicates with the mold cavity. The outer sand core and the inner sand core form an exhaust gap and a guide cavity. The guide cavity is narrow at the top and wide at the bottom. The outer wall of the inner sand core is provided with an exhaust groove to ensure that the gas can be discharged in time through the exhaust gap.
It effectively solves the problem of gas trapping at the inverted position, improves the fluidity and filling effect of molten metal, reduces porosity and incomplete filling defects, and improves the qualification rate of castings.
Smart Images
Figure CN223748492U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to foundry sand core technical field especially a gate cup sand core structure of preventing air lock. BACKGROUND
[0002] The gate cup sand core refers to the sand core part located inside the gate cup, which plays a crucial role in the pouring process of the metal liquid. The main function of the gate cup is to moderate the impact force of the metal liquid pouring and separate the slag, ensuring that the metal liquid can flow smoothly and uniformly into the mold. The sand core is used to form the cavity or complex structure inside the casting, and at the same time, it withstands the impact of high-temperature metal liquid.
[0003] The gate cup sand core will generate gas during the pouring process, mainly because the binder, moisture and other additives in the sand core material will decompose or evaporate when heated, generating gas. Impurities in the sand core, such as small clay clumps and paper clumps, will also release gas when heated. During the solidification process of the metal liquid, if the gas generated by the sand core cannot be discharged in time, air bubbles will be formed and remain in the casting, resulting in air holes. In addition, some products have shaped parts with reverse-docking shape, and the metal liquid will close the gas channels of these parts during the pouring process. The gas in the reverse-docking shape part is more difficult to discharge, and the metal liquid flow is not smooth, which cannot be fully filled, resulting in the defect of insufficient pouring. SUMMARY
[0004] In view of the deficiencies of the prior art, the utility model provides a gate cup sand core structure for preventing air lock, which aims to discharge the gas generated by the sand core in time, promote the flow and filling of the metal liquid, and improve the product yield.
[0005] The technical scheme adopted by the utility model is as follows:
[0006] A gate cup sand core structure for preventing air lock, comprising an inner ring sand core and an outer ring sand core, the inner ring sand core is assembled in the outer ring sand core;
[0007] A cavity is formed in the inner ring sand core and communicates with the mold cavity;
[0008] An exhaust gap is formed between the outer wall of the inner ring sand core and the inner wall of the outer ring sand core, the upper end of the exhaust gap is used for communicating with the external environment, a flow guide cavity is formed between the lower part of the outer wall of the inner ring sand core and the lower part of the inner wall of the outer ring sand core, the flow guide cavity is part of the mold cavity and communicates with the lower end of the exhaust gap.
[0009] Further technical scheme:
[0010] The flow guide cavity has a structure of being narrow at the top and wide at the bottom.
[0011] The lower end of the exhaust gap is located at the narrowest part of the flow guide cavity.
[0012] At least one exhaust groove is arranged on the outer wall of the inner core sand, each of the exhaust grooves extends along the generatrix direction of the outer wall, and at least a part of each of the exhaust grooves is located in the exhaust gap.
[0013] The plurality of exhaust grooves are uniformly distributed along the outer wall of the inner core sand.
[0014] The inner core sand and the outer core sand are matched through a stepped surface.
[0015] Corresponding positioning parts matched with each other are arranged on the upper part of the inner core sand and the upper part of the outer core sand, and are used for limiting the circumferential position between the inner core sand and the outer core sand.
[0016] The positioning parts matched with each other include a positioning protrusion arranged on the outer wall of the inner core sand and a positioning groove arranged on the outer core sand.
[0017] An ear part is arranged on the upper end of the outer core sand and is spaced along the circumferential direction, and the positioning groove is arranged on the inner wall of the ear part.
[0018] The upper end of the inner core sand is higher than the upper end of the outer core sand.
[0019] The beneficial effects of the utility model are as follows:
[0020] The utility model utilizes the splicing of the inner core sand and the outer core sand to form the reverse buckling part of the mold cavity, that is, the flow guide cavity, and exhausts through the exhaust gap formed by the splicing at the uppermost end of the flow guide cavity. The pouring filling will not be caused by the gas generated by the inner core sand and the gas generated by the reverse buckling structure and cannot be discharged in time, so that the filling is not full. The defects of the product corresponding to the reverse buckling position, such as the secondary air pipe end face air hole, air retention and insufficient pouring, are solved, the flowability and filling effect of the metal liquid are improved, and the qualified rate of the casting is effectively improved.
[0021] The utility model sets the exhaust groove on the outer wall of the inner core sand, which plays a flow guiding role on the one hand to ensure that the gas can be smoothly discharged, and increases the exhaust area on the other hand to improve the exhaust efficiency.
[0022] Other features and advantages of the utility model will be described in the subsequent description or can be understood by implementing the utility model. DRAWINGS
[0023] Figure 1 It is a three-dimensional structure schematic view of the utility model embodiment.
[0024] Figure 2 It is a top view. Figure 1
[0025] Figure 3 It is an enlarged view of A part in Figure 2 .
[0026] Figure 4 As Figure 2 B-B section view.
[0027] Figure 5 As Figure 4 C part enlarged view.
[0028] Figure 6 It is the principle schematic diagram of the utility model embodiment working state.
[0029] Figure 7 It is the structure schematic diagram of the utility model embodiment inner circle sand core, outer circle sand core.
[0030] In the figure: 1, inner circle sand core;2, outer circle sand core;3, exhaust groove;4, exhaust gap;5, flow guide chamber;6, positioning protrusion;7, positioning groove;8, ear;9, cavity;101, outer step surface;201, inner step surface. DETAILED DESCRIPTION
[0031] The specific implementation of the utility model is described below in combination with the drawings.
[0032] Referring to Figures 1 to 4 , the anti-airlock gate cup sand core structure of the embodiment includes inner circle sand core 1 and outer circle sand core 2, and the inner circle sand core 1 is assembled in the outer circle sand core 2.
[0033] The inner circle sand core 1 is formed with a cavity 9 communicating with the mold cavity.
[0034] The inner circle sand core 1 and the outer circle sand core 2 are formed with an exhaust gap 4, and the upper end of the exhaust gap 4 is used for communicating with the external environment, and the lower part of the outer wall of the inner circle sand core 1 and the lower part of the inner wall of the outer circle sand core 2 are formed with a flow guide chamber 5, which is part of the mold cavity and communicates with the lower end of the exhaust gap 4.
[0035] The gate cup sand core of the embodiment can discharge the gas in the mold cavity through the exhaust gap 4 in addition to the exhaust mechanism such as the exhaust plug, thereby improving the flowability and filling effect of the metal liquid and improving the product yield.
[0036] As a preferred mode, the flow guide chamber 5 has a structure of being narrow at the upper part and wide at the lower part, and the lower end of the exhaust gap 4 is located at the uppermost narrow part of the flow guide chamber 5.
[0037] Referring to Figure 6In the working process, the molten metal such as aluminum water fills the mold cavity along the path shown by the arrow in the drawing after passing through the cavity 9 of the inner ring sand core 1, and when the molten metal enters the upper-narrow-and-lower-wide flow guide cavity 5 (i.e. the reverse buckling part) formed between the inner ring sand core 1 and the outer ring sand core 2, air in the flow guide cavity 5 can be quickly discharged through the air gap 4, eliminating the filling negative pressure resistance, solving the defects of product secondary air pipe end face porosity, air retention, insufficient pouring and the like, and effectively improving the qualified rate of the casting.
[0038] The cavity 9 is provided with a step, and is preferably in an upper-wide-and-lower-narrow structure.
[0039] As a preferred mode, the inner ring sand core 1 and the outer ring sand core 2 are matched by the step surface. Specifically, as shown in Figure 4 and Figure 5 , the inner ring sand core 1 is matched with the outer ring sand core 2 by the inner step surface 201 on the inner wall of the outer ring sand core 2 and the outer step surface 101 on the outer wall of the inner ring sand core 1. It can be understood that the matching of the inner ring sand core 1 assembled in the outer ring sand core 2 belongs to clearance fit, thereby forming the air gap 4.
[0040] As a preferred mode, referring to Figure 1 and Figure 5 , the outer wall of the inner ring sand core 1 is provided with at least one air exhaust groove 3, each air exhaust groove 3 extends along the generatrix direction of the outer wall, and at least a part of each air exhaust groove 3 is located in the air gap 4.
[0041] The plurality of air exhaust grooves 3 are preferably uniformly distributed along the outer wall of the inner ring sand core 1.
[0042] Each air exhaust groove 3 is preferably in a concave arc shape.
[0043] The air exhaust groove 3 has a guiding effect on the airflow, and at the same time increases the flow cross-sectional area of the gas in the air gap 4, thereby improving the exhaust speed.
[0044] As a preferred mode, the air exhaust groove 3 extends from one end to the other end along the generatrix direction of the outer wall of the inner ring sand core 1, and the air exhaust groove 3 is also provided on the outer step surface 101.
[0045] As a preferred mode, the upper end of the inner ring sand core 1 is higher than the upper end of the outer ring sand core 2. Correspondingly, the air exhaust groove 3 also extends to the outside of the outer ring sand core 2, thereby quickly guiding the gas in the air gap 4 out.
[0046] As a preferred mode, the upper part of the inner ring sand core 1 and the upper part of the outer ring sand core 2 are correspondingly provided with a positioning part matched with each other, which is used to limit the circumferential position between the inner ring sand core 1 and the outer ring sand core 2.
[0047] Referring to Figure 7 , Figure 7The structure of the inner ring sand core 1 and the outer ring sand core 2 is shown in (a) and (b) respectively. The mutually matched positioning portions include a positioning protrusion 6 arranged on the outer wall of the inner ring sand core 1 and a positioning groove 7 arranged on the outer ring sand core 2.
[0048] As a preferred mode, the outer ring sand core 2 is provided with ear portions 8 distributed along the circumferential direction at intervals at the upper end, and the positioning groove 7 is arranged on the inner wall of the ear portion 8.
[0049] Those skilled in the art can understand that the above description is only preferred embodiments of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, and for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified or some technical features can be replaced equivalently. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A venting gate cup sand core structure, characterized by, The inner ring sand core (1) is assembled in the outer ring sand core (2); A cavity (9) is formed in the inner ring sand core (1) and communicates with a mold cavity; An exhaust gap (4) is formed between the outer wall of the inner ring sand core (1) and the inner wall of the outer ring sand core (2), the upper end of the exhaust gap (4) is used for communicating with the external environment, and a flow guide cavity (5) is formed between the lower part of the outer wall of the inner ring sand core (1) and the lower part of the inner wall of the outer ring sand core (2), the flow guide cavity (5) is used as a part of the mold cavity and communicates with the lower end of the exhaust gap (4).
2. The anti-choke gating gate cup sand core structure of claim 1, wherein, The flow guide cavity (5) has a structure of being narrow at the upper end and wide at the lower end.
3. The anti-choke gating gate cup sand core structure of claim 2, wherein, The lower end of the exhaust gap (4) is located at the narrowest part of the flow guide cavity (5).
4. The anti-choke gating gate cup sand core structure of claim 1, wherein, At least one exhaust groove (3) is arranged on the outer wall of the inner ring sand core (1), each exhaust groove (3) extends along the generatrix direction of the outer wall, and at least a part of each exhaust groove (3) is located in the exhaust gap (4).
5. The anti-choke gating gate cup sand core structure of claim 4, wherein, A plurality of exhaust grooves (3) are uniformly distributed along the outer wall of the inner ring sand core (1).
6. The anti-choke gating gate cup sand core structure of claim 1, wherein, The inner ring sand core (1) and the outer ring sand core (2) are matched through a stepped surface.
7. The anti-choke gating gate cup sand core structure of claim 1, wherein, A corresponding positioning part is arranged on the upper part of the inner ring sand core (1) and the upper part of the outer ring sand core (2) to limit the circumferential position between the inner ring sand core (1) and the outer ring sand core (2).
8. The anti-choke gating gate cup sand core structure of claim 7, wherein, The corresponding positioning part includes a positioning protrusion (6) arranged on the outer wall of the inner ring sand core (1) and a positioning groove (7) arranged on the outer ring sand core (2).
9. The anti-choke gating gate cup sand core structure of claim 8, wherein, The outer ring sand core (2) is provided with an ear part (8) distributed along the circumferential direction at intervals at the upper end, and the positioning groove (7) is arranged on the inner wall of the ear part (8).
10. The anti-choke gating gate cup sand core structure of claim 1, wherein, The upper end of the inner ring sand core (1) is higher than the upper end of the outer ring sand core (2).