Flow-controlling and slag-stopping pouring structure
By designing a flow-controlled and slag-blocking casting structure, the problems of slag inclusions and porosity in the wind power casting system were solved, achieving flow rate control and long-life use of the filter, thus improving the quality and yield of the castings.
Patent Information
- Application Number
- CN202520274908.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-02-20
AI Technical Summary
An unreasonable design of the gating system for wind turbine castings leads to slag inclusions and porosity, affecting the yield. Filters are prone to clogging, and secondary oxidation slag is difficult to control.
A flow-controlling and slag-blocking casting structure is designed, including a straight pouring channel, a flow-blocking channel, and a horizontal pouring channel. The flow rate is controlled by adjusting the cross-sectional area ratio and thickness, which prevents molten iron from contacting air, seals the casting system, and extends the service life of the filter.
Effective control of pouring flow rate avoids slag inclusions and secondary oxidation slag, extends filter service life, and improves casting quality and yield.
Smart Images
Figure CN223699338U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of flow control damming casting structure, belong to foundry technical field. BACKGROUND
[0002] With the rapid development of wind power industry, the demand for nodular cast iron fittings for wind power is rapidly increasing. Nodular cast iron is widely used due to its low cost and high toughness. The nodular cast iron for wind power is mostly medium or large castings. Compared with ordinary nodular cast iron, the quality and performance requirements for wind power castings are higher. However, due to the thickness, height and weight of wind power castings, a large amount of molten iron is needed to fill the casting cavity. If the gating system is not reasonably designed, turbulence, gas entrainment and sand flushing may occur, leading to the presence of slag and pores, and reducing the yield of castings.
[0003] To ensure the purity of the molten iron filled into the mold, a filter is usually placed in the gating system to filter impurities in the molten metal. The filter can remove slag or dross from the molten metal and reduce turbulence before the metal reaches the mold. Reducing the content of inclusions in the casting reduces the scrap level, improves the machinability and the cleanliness and quality of the overall casting. When in use, the filter is placed in the runner of the gating system. During the filtering process, inclusions are removed and trapped in front of the filter, ensuring the purity of the molten iron flowing through the filter.
[0004] Since the filter mainly relies on physical adsorption, it blocks impurities in the molten iron inside the filter. However, as the amount of adsorbed impurities increases, the passability of the filter is severely affected. Therefore, the amount of metal that can pass through the filter and the purity of the molten iron are related. When there are many impurities in the molten iron, the filter is easily clogged and loses its filtering effect. At the same time, for medium and large metal castings, a large amount of molten metal is needed, and the impact of the molten metal entering the filter at a certain flow rate on the filter causes different impact forces on different parts of the filter, thereby severely affecting the service life of the filter. The molten metal after passing through the filter is easily oxidized and forms secondary oxidation slag when it comes into contact with air in the mold cavity. When the molten metal after passing through the filter flows through the second half of the gating system and enters the casting cavity, the flow rate of the molten iron is not easy to control, and it is easy to flush away the sand and roll it into the molten iron. This causes the casting to be scrapped due to slag inclusion. SUMMARY
[0005] To overcome the shortcomings of the prior art, the utility model provides a flow control and slag blocking gating structure that can control the flow rate of the ingate and prevent sand flushing caused by slag inclusion. The rear end is closed, and when the molten iron flows in the gating structure after passing through the filter, the molten iron in the runner is in a full state and does not come into contact with air, thereby avoiding the formation of secondary oxidation slag.
[0006] The utility model discloses a flow control and slag blocking pouring structure, including the direct sprue, resistance flow channel I, horizontal runner I, horizontal runner II, resistance flow channel II and inner gate that communicate in proper order, resistance flow channel I symmetry sets up at the bottom of direct sprue, horizontal runner I communicate at resistance flow channel I rear end, and the top of horizontal runner I is higher than resistance flow channel I and horizontal runner II.
[0007] The ratio of the cross-sectional area of the direct sprue and the resistance flow channel I is 1.2:1.1.
[0008] The ratio of the cross-sectional area of the resistance flow channel I and the horizontal runner I is 1.1:1.4.
[0009] The ratio of the cross-sectional area of the horizontal runner I and the horizontal runner II is 1.4:1.3.
[0010] The ratio of the cross-sectional area of the horizontal runner II and the resistance flow channel II is 1.3:1.
[0011] The ratio of the cross-sectional area of the resistance flow II channel and the inner gate is 1:1.5.
[0012] The thickness of the resistance flow II channel is set to 6-10mm.
[0013] The thickness of the resistance flow II channel is set to 8mm.
[0014] The inner gate is in a stepped shape, and the height difference of each step is set to be within 60mm.
[0015] The direct sprue is a vertically arranged cylindrical cavity.
[0016] The utility model discloses the beneficial effects are: can control inner gate flow rate, avoid its sand and cause slag. Realize rear end closure, and the molten iron in the runner is in the full state when the iron liquid flows in the pouring system after passing through the filter, does not contact with air, avoids producing secondary oxidized slag. The pouring time can be fine adjusted by adjusting the cross-sectional area of the resistance flow, and the pouring structure is easy to adjust when the casting appears problems. The pouring structure is closed in the filter front section, so that the molten iron is in the full state in the direct sprue, and the existing slag floats to the inner gate cup, avoiding too many inclusions passing through the filter and needing to be adsorbed by the filter. The use time of the filter is prolonged, so that it can play a filtering role in the whole pouring process. DRAWINGS
[0017] The utility model will be further described below according to the drawings and examples.
[0018] Figure 1 It is the structure schematic diagram of the utility model;
[0019] Figure 2 It is the perspective drawing of the utility model.
[0020] In the figure: 1, sprue; 2, choke I; 3, cross gate I; 4, cross gate II; 5, choke II; 6, inner gate. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.
[0022] In the description of the utility model, it needs to be explained that the directions or position relations indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are the directions or position relations shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model; the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements inside. For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0023] As shown in Figure 1 and Figure 2 A flow control and slag blocking pouring structure, comprising a straight sprue 1, a choke I 2, a cross gate I 3, a cross gate II 4, a choke II 5 and an inner gate 6 which are sequentially communicated, the choke I 2 is symmetrically arranged at the bottom of the straight sprue 1, the cross gate I 3 is communicated at the rear end of the choke I 2, and the top of the cross gate I 3 is higher than the choke I 2 and the cross gate II 4.
[0024] The ratio of the cross-sectional area of the straight sprue 1 to the choke I 2 is 1.2:1.1, which can rapidly fill the choke I 2 and the straight sprue 1 at the beginning of pouring, avoid air entrainment and sand washing of molten iron, and make impurities in the molten iron float to the inner gate cup, so that too many impurities flow to the filter and consume the filtering capacity of the filter.
[0025] The ratio of the cross-sectional area of the runner 2 to the cross-sectional area of the cross gate 3 is 1.1:1.4, which aims to enlarge the ratio of the back end of the runner, so that the area of the molten iron flow is suddenly enlarged after passing through the filter, the flow rate of the molten iron is reduced, the flow rate of the molten iron is slowed down, and the molten iron is kept pure.
[0026] The ratio of the cross-sectional area of the cross gate 3 to the cross-sectional area of the cross gate 4 is 1.4:1.3. When the cross gate 3 is divided into two sides, the cross-sectional area is small, which can ensure that the cross gate 4 is full when it is divided, and avoid oxidation and slag caused by contact with air in the gate.
[0027] The ratio of the cross-sectional area of the cross gate 4 to the cross-sectional area of the runner 5 is 1.3:1. The runner 5 is the runner of the entire pouring structure, and its ratio is set to 1, which is the basis for designing other components. Other components are appropriately enlarged or reduced on this basis.
[0028] The ratio of the cross-sectional area of the runner 5 to the cross-sectional area of the inner gate 6 is 1:1.5. The purpose is to enlarge the cross-sectional area of the inner gate 6, so that the flow rate at the water inlet is reduced to 0.6 m / s or less, and slag eyes caused by molten iron scouring sand are avoided.
[0029] The thickness of the runner 5 is set to 8 mm. The pouring time of the entire pouring system is controlled by the runner 5. When the pouring time needs to be adjusted, the thickness of the runner 5 is adjusted to fluctuate within the range of 8±2 mm. When the pouring speed needs to be increased, the thickness of the runner 5 is increased. When the pouring speed needs to be reduced, the thickness of the runner 5 is reduced.
[0030] The inner gate 6 is step-shaped, and the height difference of each step is set to be within 60 mm. The large difference is avoided to increase the flow rate of the molten iron.
[0031] The straight runner 1 is a vertical cylindrical cavity.
[0032] The runner 5 is the runner position of the entire flow control and slag blocking pouring structure. The cross-sectional area and size of the runner 5 are determined by calculating the pouring weight.
[0033] Finally, it should be pointed out that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A flow-controlled and slag-blocking casting structure, characterized in that: It includes a straight sprue (1), a sprue I (2), a sprue I (3), a sprue II (4), a sprue II (5), and an ingate (6) connected in sequence. The sprue I (2) is symmetrically arranged at the bottom of the straight sprue (1). The sprue I (3) is connected to the rear end of the sprue I (2). The top of the sprue I (3) is higher than the sprue I (2) and the sprue II (4).
2. The flow-controlled and slag-blocking casting structure according to claim 1, characterized in that: The ratio of the cross-sectional area of the direct gating channel (1) and the flow-blocking channel I (2) is 1.2:1.
1.
3. The flow-controlled and slag-blocking casting structure according to claim 1, characterized in that: The ratio of the cross-sectional area of the obstruction channel I (2) and the horizontal sprue I (3) is 1.1:1.
4.
4. The flow-controlled and slag-blocking casting structure according to claim 1, characterized in that: The ratio of the cross-sectional areas of the horizontal sprue I (3) and the horizontal sprue II (4) is 1.4:1.
3.
5. The flow-controlling and slag-blocking casting structure according to claim 1, characterized in that: The ratio of the cross-sectional area of the horizontal gating channel II (4) and the flow obstruction channel II (5) is 1.3:
1.
6. The flow-controlled slag-blocking casting structure according to claim 1, characterized in that: The ratio of the cross-sectional area of the flow obstruction channel II (5) and the ingate (6) is 1:1.
5.
7. The flow-controlled and slag-blocking casting structure according to claim 1, characterized in that: The thickness of the flow-blocking channel II (5) is set to 6-10 mm.
8. The flow-controlled slag-blocking casting structure according to claim 7, characterized in that: The thickness of the flow-blocking channel II (5) is set to 8 mm.
9. The flow-controlled slag-blocking casting structure according to claim 1, characterized in that: The ingate (6) is stepped, and the height difference between each step is set within 60mm.
10. The flow-controlling and slag-blocking casting structure according to claim 1, characterized in that: The direct gating channel (1) is a vertically arranged cylindrical cavity.