A casting gating structure for ADI material

Abstract

This utility model discloses a casting structure for ADI material, belonging to the field of sand casting technology. It includes a gating system; a filter chamber comprising an upper pressure groove, a lower pressure groove, and several filters separating the upper and lower pressure grooves. One end of the upper pressure groove is connected to the gating system, and the groove width and cross-sectional area of ​​the upper pressure groove gradually increase away from the gating system. The outlet is connected to the lower pressure groove. The upper pressure groove's gradually increasing groove width and cross-sectional area away from the gating system allows for control of the amount of molten iron passing through each filter, reducing the risk of damage to the front-end filters due to excessive molten iron flow reaching their service life. This ensures each filter reaches its maximum filtration value, improving the filtration capacity of each filter and reducing the number of filters required. Simultaneously, the shape of the upper pressure groove utilizes fluid dynamics principles, transforming some of the turbulent flow in the molten iron into laminar flow, avoiding the increase of inclusions and gas entrainment, and reducing secondary slagging.

Description

Technical Field

[0001] This utility model relates to the field of sand casting technology, specifically to a casting and pouring structure for ADI material. Background Technology

[0002] Isothermal hardened ductile iron (ADI) is a cast iron material obtained by isothermal hardening of ductile iron of a certain composition. It has advantages such as high specific strength, high fatigue strength, good wear resistance, and good sound and vibration absorption. Replacing steel parts with ADI materials can reduce production costs and reduce workpiece weight.

[0003] During the casting and pouring process of ADI materials, there is a lot of slag adhering to the surface, which can easily flow into the mold cavity with the molten iron. Therefore, a filtration system needs to be set up in the gating system. At present, in the field of sand casting, the common filter is a ceramic filter disc. The ceramic filter disc needs to be used in conjunction with the filter disc groove. The filter disc groove serves to fix the ceramic filter disc and at the same time increases the area of ​​molten iron passing through the ceramic filter disc, ensuring that the ceramic filter disc is fully utilized.

[0004] Currently, commonly used ceramic filter discs are standard rectangles. To ensure that the ceramic filter discs have a sufficiently large usable area, the filter disc grooves are usually also standard rectangles (becoming trapezoidal after adding a draft angle). During the casting process, molten iron flows in from one side of the filter disc groove, causing the ceramic filter discs closer to the molten iron inflow side to pass through more molten iron than those farther away. The ceramic filter discs closer to the molten iron inflow side will reach their filtration limit earlier and break. The slag in the molten iron will then enter the mold cavity through the broken ceramic filter discs, greatly reducing the filtration capacity of the gating system.

[0005] Furthermore, the commonly used rectangular filter disc grooves can only support 3 or 2 sides of the ceramic filter disc, and the middle part of the ceramic filter disc cannot be effectively supported, which will also reduce the service life of the ceramic filter disc and affect the filtration capacity. In this case, it is necessary to increase the number of ceramic filter discs to distribute the amount of molten iron filtered by each ceramic filter disc in order to ensure the stability of the filtration system.

[0006] In addition, ADI material is prone to oxidation. If turbulence or splashing occurs during casting, secondary slag will be generated. The casting structure should be designed to prevent such casting defects.

[0007] Therefore, developing an ADI material casting casting structure that can effectively improve the utilization rate of sheet ceramic filter plates in the casting system and reduce the number of sheet ceramic filter plates used is an urgent problem to be solved at this stage. Summary of the Invention

[0008] To address the problems existing in the prior art, this utility model provides an ADI material casting structure. The width and cross-sectional area of ​​the upper pressure groove gradually increase in the direction away from the inlet channel, which can control the amount of molten iron passing through each filter, reduce the risk of the filters located at the front end breaking due to the large amount of molten iron passing through and reaching the end of their service life, and ensure that each filter reaches its limit filtration value, thereby improving the filtration capacity of each filter and reducing the number of filters used. At the same time, the shape of the upper pressure groove utilizes the principles of fluid mechanics, which can transform part of the turbulent flow in the molten iron into laminar flow, avoiding the increase of inclusions and gas entrainment, and reducing secondary slagging.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] This utility model provides a casting and pouring structure for ADI material, including:

[0011] Inlet gate;

[0012] The filter chamber includes an upper pressure groove, a plurality of filters, and a lower pressure groove. The plurality of filters separate the upper pressure groove and the lower pressure groove. One end of the upper pressure groove is connected to the inlet channel. The width of the groove opening of the upper pressure groove gradually increases in the direction away from the inlet channel, and the cross-sectional area of ​​the upper pressure groove gradually increases in the direction away from the inlet channel.

[0013] The gating channel is connected to the pressure channel.

[0014] As a preferred technical solution, the filter chamber is located inside the sand mold, the sand mold includes an upper mold and a lower mold, the upper pressure groove is formed on the lower surface of the upper mold, and the lower pressure groove is formed on the upper surface of the lower mold.

[0015] As a preferred technical solution, the pressure groove is provided with a plurality of support seats, the upper end of the support seats abutting against the lower surface of the filter.

[0016] As a preferred technical solution, the upper end of the support base is smaller than the lower end of the support base, and the lower end of the support base is embedded in the lower mold.

[0017] As a preferred technical solution, the upper surface of the lower mold is provided with a support cavity that matches the plurality of filters.

[0018] As a preferred technical solution, several of the filters are distributed along a direction away from the inlet channel.

[0019] As a preferred technical solution, the filter is a ceramic filter sheet.

[0020] As a preferred technical solution, the cross-sectional shape of the upper pressure groove is set to trapezoidal, semi-circular or semi-elliptical.

[0021] As a preferred technical solution, the gating system includes a straight gating system and a horizontal gating system, one end of the horizontal gating system is connected to the lower end of the straight gating system, and the other end of the horizontal gating system is connected to the upper pressure groove; the gating system is configured as an inlet gating system.

[0022] As a preferred technical solution, a groove for the straight pouring channel is provided at the connection between the straight pouring channel and the horizontal pouring channel;

[0023] And / or, the upper end of the direct pouring channel is provided with a water inlet basin;

[0024] And / or, the sprue is vertically arranged, the glide sprue is horizontally arranged, and the extension direction of the glide sprue is the same as the extension direction of the upper pressure groove;

[0025] And / or, both the sprue and the ingate are cylindrical ceramic tubes.

[0026] The beneficial effects of this utility model are as follows:

[0027] 1. The width and cross-sectional area of ​​the upper pressure trough of this utility model gradually increase away from the inlet channel. Because the front cross-sectional area of ​​the upper pressure trough is smaller, the pressure is greater, which makes the molten iron flow rate faster and the molten iron quickly reaches the filter at the rear. In addition, the front end of the upper pressure trough is narrower, and the usable area of ​​the filter is smaller, which can reduce the amount of molten iron passing through. On the other hand, the rear end of the upper pressure trough is wider, and the usable area of ​​the filter is larger, which can increase the amount of molten iron passing through. This effectively balances the amount of molten iron passing through each filter, reduces the risk of the filter at the front end breaking due to the large amount of molten iron passing through and reaching the end of its service life. This allows each filter to reach its limit filtration value, improves the filtration capacity of each filter, and reduces the number of filters used. At the same time, because the front cross-sectional area of ​​the upper pressure trough is smaller, according to the principle of fluid mechanics, the turbulence in the molten iron can be transformed into laminar flow when it passes through, avoiding the increase of impurities and gas entrainment, and reducing secondary slag formation.

[0028] 2. The support base of this utility model supports the middle position of the filter, which can increase the support area of ​​the filter, make the filter more uniformly stressed, and improve the strength of the filter. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the casting and pouring structure for ADI material according to this utility model;

[0030] Figure 2 for Figure 1 Front view;

[0031] Figure 3 for Figure 1 A top view of the filter chamber in the middle;

[0032] Figure 4 for Figure 3 Internal structure diagram;

[0033] Figure 5 for Figure 4 A schematic diagram of the support base in the diagram.

[0034] In the diagram: 1-Gating gate, 11-Sprue, 12-Gating runner, 13-Sprue recess, 14-Gating bowl, 2-Upper pressure groove, 3-Filter, 4-Lower pressure groove, 5-Gating outlet, 6-Support base. Detailed Implementation

[0035] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0036] Please refer to Figures 1-5 This is a first embodiment of an ADI material casting pouring structure provided by the present invention, including a gating system 1, a filter chamber and a pouring system 5. The filter chamber includes an upper pressure groove 2, several filters 3 and a lower pressure groove 4 distributed in a vertical direction. The filters 3 separate the upper pressure groove 2 and the lower pressure groove 4. The opening of the upper pressure groove 2 is downward and the opening of the lower pressure groove 4 is upward. One end of the upper pressure groove 2 is connected to the gating system 1 and the pouring system 5 is connected to the lower pressure groove 4. Molten iron flows into the upper pressure groove 2 of the filter chamber through the gating system 1, and after being filtered by the filters 3, it flows into the pouring system 5 from the lower pressure groove 4.

[0037] The width of the upper pressure groove 2 gradually increases in the direction away from the inlet gate 1, such as... Figure 3 As shown, the width 'a' at the front end of the upper pressure trough 2 is smaller than the width 'b' at the rear end of the upper pressure trough 2. At the same time, the cross-sectional area of ​​the upper pressure trough 2 gradually increases in the direction away from the inlet channel 1, which can effectively control the amount of molten iron passing through each filter 3 distributed in sequence, reduce the risk of the filter 3 located at the front end breaking due to the large amount of molten iron passing through and reaching the end of its service life, make each filter 3 reach the limit filtration value, improve the filtration capacity of each filter 3, and reduce the number of filters 3 used. At the same time, the shape of the upper pressure trough 2 utilizes the principle of fluid mechanics, which can transform part of the turbulent flow in the molten iron into laminar flow, avoid increasing inclusions and entrained gas, and reduce secondary slag formation.

[0038] In actual production, the filter chamber is located inside the sand mold, which includes an upper mold and a lower mold. The cavity of the upper pressure groove 2 is formed on the lower surface of the upper mold, and the cavity of the lower pressure groove 4 is formed on the upper surface of the lower mold. Several filters 3 are placed in the lower pressure groove 4, and the filter chamber is formed after the upper mold and the lower mold are closed.

[0039] Specifically, filter 3 is preferably a ceramic filter.

[0040] Further, please refer to Figure 4 Several filters 3 are distributed in a direction away from the sprue 1; correspondingly, a support cavity matching the filters 3 is provided on the upper surface of the lower mold, and the filters 3 can be stably and accurately placed between the upper pressure groove 2 and the lower pressure groove 4.

[0041] In this embodiment, please refer to Figure 4 and Figure 5 The lower pressure groove 4 is provided with several support seats 6, and the upper end of the support seat 6 abuts against the lower surface of the filter 3.

[0042] Further, please refer to Figure 4 and Figure 5 The support base 6 is in the shape of a frustum, with the upper end of the support base 6 being smaller than the lower end of the support base 6. The lower end of the support base 6 is embedded in the lower mold, which can improve the support stability of the support base 6. In other embodiments, the support base 6 can also be cylindrical, as long as it can stably support the filter 3.

[0043] In this embodiment, please refer to Figure 1 and Figure 2 The gating system 1 includes a sprue 11 and a gating system 12. One end of the gating system 12 is connected to the lower end of the sprue 11, and the other end of the gating system 12 is connected to the upper pressure groove 2. The gating system 5 is set as an ingate, which is embedded in the sand mold to connect the casting cavity with the lower pressure groove 4.

[0044] For details, please refer to Figure 1 and Figure 2 The sprue 11 is vertically set and embedded in the sand mold; the sprue 12 is horizontally set and extends from both sides of the sprue recess 13. The cavity of the sprue 12 is made by the upper mold. The extension direction of the sprue 12 is the same as the extension direction of the upper pressure groove 2; the sprue recess 13 is provided at the connection between the sprue 11 and the sprue 12. The cavity of the sprue recess 13 is made by the upper mold; the upper end of the sprue 11 is provided with a sprue basin 14. The topmost sprue basin 14 is used to receive molten iron from the ladle.

[0045] It should be noted that both the sprue 11 and the ingate are preferably cylindrical ceramic tubes.

[0046] In this embodiment, please refer to Figure 3 The upper pressure groove 2 has a trapezoidal cross-section and a trapezoidal cross-section, which facilitates its formation on the upper surface of the sand mold. In other embodiments, the upper pressure groove 2 can also have a rectangular, semi-circular, or semi-elliptical cross-section, in order to effectively control the flow rate of molten iron and guide its flow direction.

[0047] Please refer to Figures 1-5The specific working process of this utility model is as follows:

[0048] After molten iron is poured from the ladle into the sprue basin 14, it enters the upper pressure trough 2 through the straight pouring channel 11, the straight pouring channel recess 13, and the horizontal pouring channel 12. Because the upper pressure trough 2 is narrow at the front and wide at the back, and the cross-sectional area of ​​the upper pressure trough 2 gradually increases in the direction away from the inlet channel 1, the molten iron is accelerated under the action of pressure, so that the volume of molten iron passing through each ceramic filter is nearly uniform. In addition, the slag in the molten iron impacts the rear end of the upper pressure trough 2 under the action of the molten iron. Since the rear end of the upper pressure trough 2 is wider, the slag has sufficient space to float upward. At the same time, the support base 6 is pre-embedded in the sand mold in the early stage, which plays the role of supporting the ceramic filter, so that the ceramic filter is subjected to force evenly and improves the service life of the ceramic filter.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., 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 casting structure for ADI material, characterized in that, include: Inlet gate (1); The filter chamber includes an upper pressure groove (2), a plurality of filters (3) and a lower pressure groove (4). The plurality of filters (3) separate the upper pressure groove (2) and the lower pressure groove (4). One end of the upper pressure groove (2) is connected to the sprue (1). The width of the groove opening of the upper pressure groove (2) gradually increases in the direction away from the sprue (1). The cross-sectional area of ​​the upper pressure groove (2) gradually increases in the direction away from the sprue (1). The gating channel (5) is connected to the pressure groove (4).

2. The ADI material casting and pouring structure according to claim 1, characterized in that, The filter chamber is located inside the sand mold, which includes an upper mold and a lower mold. The upper pressure groove (2) is formed on the lower surface of the upper mold, and the lower pressure groove (4) is formed on the upper surface of the lower mold.

3. The ADI material casting and pouring structure according to claim 2, characterized in that, The pressure groove (4) is provided with several support seats (6), and the upper end of the support seat (6) abuts against the lower surface of the filter (3).

4. The ADI material casting and pouring structure according to claim 3, characterized in that, The upper end of the support base (6) is smaller than the lower end of the support base (6), and the lower end of the support base (6) is embedded in the lower mold.

5. The ADI material casting and pouring structure according to claim 2, characterized in that, The upper surface of the lower mold is provided with a support cavity that matches a plurality of the filters (3).

6. A casting and pouring structure for ADI material according to claim 1 or 3, characterized in that, Several of the filters (3) are distributed in a direction away from the inlet channel (1).

7. The ADI material casting and pouring structure according to claim 1, characterized in that, The filter (3) is a ceramic filter.

8. The ADI material casting and pouring structure according to claim 1, characterized in that, The cross-sectional shape of the upper pressure groove (2) is set to trapezoidal, semi-circular or semi-elliptical.

9. The ADI material casting and pouring structure according to claim 1, characterized in that, The gating system (1) includes a sprue (11) and a gating system (12). One end of the gating system (12) is connected to the lower end of the sprue (11), and the other end of the gating system (12) is connected to the upper pressure groove (2). The gating system (5) is configured as an inlet gating system.

10. The ADI material casting and pouring structure according to claim 9, characterized in that, A sprue recess (13) is provided at the connection between the sprue (11) and the gutter (12). And / or, the upper end of the direct gating channel (11) is provided with a sprue basin (14). And / or, the sprue (11) is vertically arranged, the sprue (12) is horizontally arranged, and the extension direction of the sprue (12) is the same as the extension direction of the upper pressure groove (2); And / or, both the sprue (11) and the ingate are cylindrical ceramic tubes.

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