Pouring system for producing annular nodular cast iron blanks through precoated sand horizontal parting
By introducing a tangential ingate and stepped runner design into the gating system for producing ring-shaped ductile iron billets using horizontal parting with coated sand, and combining it with a vacuum negative pressure device, the problem of turbulent air entrapment during the casting process was solved, achieving stable flow of molten metal and high-quality forming.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU JINDING PRECISION CASTING
- Filing Date
- 2025-07-04
- Publication Date
- 2026-05-12
AI Technical Summary
The existing gating system for producing ring-shaped ductile iron billets using coated sand horizontal parting is prone to generating turbulent air entrapment and unstable molten metal flow during casting, resulting in bubbles that affect the casting formation.
The design employs a tangential ingate and a stepped runner, combined with a vacuum negative pressure device. The molten metal flows into the molding die in a swirling state through the filter plate and the feeding pipe to exhaust the air. Gravity and swirling flow are used to reduce turbulence and ensure uniform flow of the molten metal.
It effectively reduces turbulent air entrapment during the pouring process, ensures stable flow of molten metal and molding quality, and improves the molding effect of castings.
Smart Images
Figure CN224222676U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of casting device technology, specifically a casting system for horizontal parting production of ring-shaped ductile iron billets using coated sand. Background Technology
[0002] The gating system refers to a series of devices and channels used in the casting process to transport molten metal from the casting equipment to the mold. It is a crucial part of the casting process, ensuring that the metal flows smoothly and evenly into the mold to form the desired casting. Existing gating systems for horizontal parting production of ring-shaped ductile iron billets using coated sand still have certain shortcomings in use, such as:
[0003] In existing gating systems used for horizontal parting production of ring-shaped ductile iron billets with coated sand, the gate entering the mold is usually perpendicular to the cavity inside the mold. During the pouring process, a large amount of turbulent air entrapment is generated, which easily produces air bubbles and affects the molding of the casting. In addition, the pouring channel is usually horizontal, and air in the molten metal will flow into the mold along with the molten metal, resulting in unstable molten metal flow. Utility Model Content
[0004] The purpose of this invention is to provide a casting system for horizontal parting production of ring-shaped ductile iron billets using coated sand, in order to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a casting system for horizontal parting production of ring-shaped ductile iron billets using coated sand, comprising a pouring cup for feeding, a filter box connected above the pouring cup, and a filter plate for filtering impurities in the molten metal connected to the inner wall of the filter box.
[0006] One side of the filter box is connected to a DC guide plate for conveying molten metal, and the DC guide plate has stepped channels for smooth transition of the molten metal.
[0007] Preferably, the inner wall of the stepped passage is provided with a through hole for venting.
[0008] Preferably, the stepped channel has outlets at both the front and rear for conveying molten metal.
[0009] Preferably, a shunt platform for support is connected to the outer side of the DC runner plate, and a feed tube for replenishing molten metal is threadedly connected above the shunt platform through a threaded hole. The feed tube is positioned above the through hole.
[0010] Preferably, the front and rear of the distribution platform are both connected to distribution pipes for conveying molten metal, and the end of the distribution pipe away from the distribution platform is connected to a forming mold for forming molten metal.
[0011] Preferably, the inner wall of the forming mold near the manifold is provided with a tangential ingate for swirling filling of molten metal.
[0012] Preferably, an exhaust pipe for venting is threadedly connected to the top of the molding die via a threaded hole. Compared with the prior art, the beneficial effects of this utility model are:
[0013] 1. When molten metal flows into the mold through a tangential ingate, the molten metal forms a swirling flow, reducing turbulence and air entrapment;
[0014] 2. By using a stepped channel, the molten metal is affected by gravity and flows out of the outlet evenly, allowing the molten metal to transition smoothly. Attached Figure Description
[0015] Figure 1 This is a three-dimensional structural diagram of the pouring cup of this utility model;
[0016] Figure 2 This is a schematic diagram of the three-dimensional structure of the flow divider of this utility model;
[0017] Figure 3 This is a schematic diagram of the three-dimensional cross-sectional structure of the DC guide plate of this utility model;
[0018] Figure 4 This is a schematic diagram of the main cross-sectional structure of the DC channel plate of this utility model;
[0019] Figure 5 This is a schematic diagram of the three-dimensional cross-sectional structure of the flow divider of this utility model;
[0020] Figure 6 This is a three-dimensional structural diagram of the diversion pipe fitting of this utility model;
[0021] Figure 7 This is a schematic diagram of the three-dimensional cross-sectional structure of the tangential ingate of this utility model.
[0022] In the diagram: 1. Sprue cup; 2. Filter box; 3. Straight runner; 4. Diverter; 5. Shrink tube; 6. Diverter fitting; 7. Molding mold; 8. Exhaust pipe; 9. Filter plate; 10. Stepped runner; 11. Outlet; 12. Tangential ingate; 13. Through hole. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0024] Please see Figure 1 and Figure 2 This utility model provides a technical solution: a casting system for horizontal parting production of ring-shaped ductile iron billets using coated sand, including a pouring cup 1 for feeding, a filter box 2 connected above the pouring cup 1, a DC guide plate 3 for conveying molten metal connected to one side of the filter box 2, a distribution platform 4 for support connected to the outside of the DC guide plate 3, and a feeding pipe 5 for replenishing molten metal connected to the top of the distribution platform 4 through a threaded hole.
[0025] This gating system for horizontal parting production of ring-shaped ductile iron billets using coated sand has a U-shaped channel in the pouring cup 1, which is connected to the filter box 2. When molten metal is poured into the pouring cup 1, it flows from the U-shaped channel into the filter box 2 and then into the DC runner plate 3. Multiple flow dividers 4 are evenly arranged to support the DC runner plate 3. At the same time, the flow dividers 4 can also divide the molten metal in the DC runner plate 3 and discharge the air in the DC runner plate 3 through the feeding pipe 5. In addition, molten metal can be added through the feeding pipe 5 to fill the cavity generated by the air discharge of the flow dividers 4.
[0026] exist Figures 1-3 and Figure 6 In the middle, the front and rear of the distribution platform 4 are connected to the distribution pipe fittings 6 for conveying molten metal. The end of the distribution pipe fitting 6 away from the distribution platform 4 is connected to the forming mold 7 for forming molten metal. The top of the forming mold 7 is connected to the exhaust pipe 8 for exhausting through the threaded hole.
[0027] This casting system is used for horizontal parting production of ring-shaped ductile iron billets with coated sand. The molten metal flows from the distribution table 4 into the distribution pipe 6, and then into the forming mold 7. It is cooled and shaped in the cavity of the forming mold 7. The air rises and is discharged from the exhaust pipe 8. A vacuum negative pressure device is connected above the exhaust pipe 8 to assist in the discharge of gas.
[0028] exist Figure 3 and Figure 4 In the middle, the inner wall of the filter box 2 is connected to a filter plate 9 for filtering impurities in the molten metal.
[0029] This casting system, used for horizontal parting production of ring-shaped ductile iron billets with coated sand, has molten metal entering the filter box 2, where it is filtered by the filter plate 9 to remove impurities, and then flows into the direct current channel plate 3.
[0030] exist Figure 3 and Figure 4 In the middle, a stepped channel 10 is provided in the DC channel plate 3 for smooth transition of molten metal.
[0031] This gating system, used for horizontal parting production of ring-shaped ductile iron billets with coated sand, has a three-tiered stepped structure with each tier having a height difference of 1.2-1.5 times the thickness of the casting. This allows air in the molten metal to rise and the molten metal to fall, expelling air bubbles and ensuring a smooth transition of the molten iron.
[0032] exist Figure 3 and Figure 4 In the middle, the front and rear of the stepped channel 10 are provided with liquid outlets 11 for conveying molten metal.
[0033] The casting system used for horizontal parting production of ring-shaped ductile iron billets with coated sand has an outlet 11 located at the bottom of the stepped channel 10. The molten metal flows from the filter box 2 into the stepped channel 10, then through the outlet 11 into the distribution platform 4, and then from the distribution platform 4 into the distribution pipe 6 for distribution.
[0034] exist Figure 7 In the middle, a tangential ingate 12 for swirling filling of molten metal is provided on the inner wall of the forming mold 7 near the manifold 6.
[0035] The gating system used for horizontal parting production of ring-shaped ductile iron billets with coated sand has a tangential ingate 12 with a tangential angle of 20°-35° to the ring wall of the forming mold 7. When the molten metal flows from the distribution pipe 6 into the forming mold 7 through the tangential ingate 12, the molten metal forms a swirling state, reducing turbulent air entrapment.
[0036] exist Figure 5 In the middle, a through hole 13 for venting is provided on the upper part of the inner wall of the stepped passage 10, and the through hole 13 is located below the shrinkage tube 5.
[0037] This gating system is used for horizontal parting production of ring-shaped ductile iron billets with coated sand. Air bubbles in the molten metal flowing in the stepped channel 10 rise and are discharged from the through hole 13 through the feeding pipe 5.
[0038] In summary: When using this casting system for horizontal parting production of ring-shaped ductile iron billets with coated sand, firstly, the vacuum negative pressure device is connected to the exhaust pipe 8 via a pipe, and the molten metal is poured into the pouring cup 1. After being filtered by the filter plate 9, it enters the stepped channel 10. Air and air bubbles in the molten metal in the stepped channel 10 are discharged from the feeding pipe 5. Then, molten metal is added from the feeding pipe 5 to fill the cavity generated in the discharged gas. The molten metal flows from the outlet 11, the diversion pipe 6, and the tangential ingate 12 to fill the forming mold 7, and the air in the forming mold 7 is discharged from the exhaust pipe 8. After waiting for a period of time, the molten metal is allowed to cool and solidify in the forming mold 7. Then, the forming mold 7 is opened, the hot section of the molten metal in the tangential ingate 12 is cut off, and the cast iron billet formed in the forming mold 7 is taken out. The contents not described in detail in this description belong to the prior art known to those skilled in the art.
Claims
1. A gating system for horizontal parting production of ring-shaped ductile iron billets using coated sand, characterized in that: It includes a pouring cup (1) for feeding, a filter box (2) for conveying molten metal is connected above the pouring cup (1), a filter plate (9) for filtering impurities in the molten metal is connected to the inner wall of the filter box (2); a direct current channel plate (3) for conveying molten metal is connected to one side of the filter box (2), and a stepped channel (10) for smooth transition of molten metal is opened in the direct current channel plate (3).
2. The gating system for horizontal parting production of ring-shaped ductile iron billets using coated sand, as described in claim 1, is characterized in that: The inner wall of the stepped channel (10) is provided with a through hole (13) for venting and feeding.
3. The gating system for horizontal parting production of ring-shaped ductile iron billets using coated sand according to claim 1, characterized in that: The stepped channel (10) is provided with outlets (11) for conveying molten metal at both the front and rear.
4. A casting system for horizontal parting production of ring-shaped ductile iron billets using coated sand, as described in claim 2, characterized in that: The outside of the DC runner (3) is connected to a shunt platform (4) for supporting the DC runner (3). Above the shunt platform (4) is a feed tube (5) for replenishing molten metal and venting gas, which is threaded through a threaded hole. The feed tube (5) is located above the through hole (13).
5. A gating system for horizontal parting production of ring-shaped ductile iron billets using coated sand, as described in claim 4, characterized in that: The front and rear of the flow distribution platform (4) are connected to flow distribution pipes (6) for conveying molten metal, and the end of the flow distribution pipe (6) away from the flow distribution platform (4) is connected to a forming mold (7) for forming molten metal.
6. A gating system for horizontal parting production of ring-shaped ductile iron billets using coated sand, as described in claim 5, characterized in that: A tangential ingate (12) for swirling filling of molten metal is provided on the inner wall of the forming mold (7) near the manifold (6).
7. A gating system for horizontal parting production of ring-shaped ductile iron billets using coated sand, as described in claim 5, characterized in that: An exhaust pipe (8) for venting is threadedly connected above the molding die (7) via a threaded hole.