Single-riser casting sand mold

Abstract

The utility model discloses a single-riser casting sand mold, and relates to the technical field of casting molding. The pouring device comprises a cavity, inclined pouring gates and a pouring cup, the two inclined pouring gates are arranged on the peripheral side of the cavity, the pouring cup is arranged above the higher ends of the inclined pouring gates, the two sets of inclined inner pouring gates are further arranged on the peripheral side of the cavity, the inner pouring gates are fixedly connected with the cavity in a through mode, and the higher ends of the inner pouring gates in each set are jointly and fixedly connected with a transverse pouring gate. And one side of the transverse pouring gate is fixedly connected with the inclined pouring gate in a through mode, the bottom end of the pouring cup is fixedly connected with a valve, and a ceramic filter screen is arranged in the pouring cup. By arranging the two inclined pouring gates, the two transverse pouring gates, the two sets of inclined inner pouring gates, the pouring cup, the liquid storage barrel, the valve and the ceramic filter screen, the problem that bubbles are generated in the process of adding molten metal into an existing single-riser casting sand mold is solved; and the pouring speed is low. And the flow velocity of the molten metal cannot be controlled. And impurities in the molten metal cannot be removed.

Description

Technical Field

[0001] This utility model belongs to the field of casting molding technology, and in particular relates to a single riser casting sand mold. Background Technology

[0002] Sand casting uses natural or synthetic sand as the mold material. It produces castings through steps such as prototyping, filling with molding sand, pouring molten metal, and cooling and demolding. Sand casting has advantages such as low cost, strong process controllability, and environmental friendliness. In the sand casting process, the sand mold plays an irreplaceable role. Single-riser sand molds are widely used due to their high material utilization and optimized thermal management. However, traditional single-riser sand molds still have the following problems in use:

[0003] Traditional single-riser casting sand molds typically add molten metal into the casting through a sprue. During the process of adding molten metal, the molten iron directly enters the mold cavity, which may trap gas, resulting in porosity on the surface of the formed casting.

[0004] Traditional single-riser casting sand molds are used for casting thin-walled or complex parts. Because there is only one sprue, the pouring speed of the molten metal is slow, which may cause the molten metal to solidify prematurely in the cavity, forming a cold shut, which affects the quality of the casting and the yield.

[0005] 3. Traditional single-riser casting sand molds typically add molten metal by slowly pouring it into the pouring cup manually. During the operation, problems such as hand tremors may occur, resulting in uneven flow rate of the added molten metal, which in turn leads to turbulence and the generation of air bubbles. This results in the casting containing pores, affecting the strength and precision of the casting.

[0006] 4. In traditional single-riser casting sand molds, molten metal is directly added to the mold cavity. Impurities in the molten metal cannot be removed and solidify inside the mold cavity along with the molten metal, affecting the strength of the formed casting and leading to a decrease in casting quality.

[0007] To address these issues, we provide a single-riser casting sand mold. Utility Model Content

[0008] The purpose of this invention is to provide a single-riser casting sand mold that solves the problems of bubble generation during the liquid addition process, slow pouring speed, inability to control the flow rate of molten metal, and inability to remove impurities from molten metal by setting up two inclined sprues, two horizontal sprues, two sets of inclined ingates, a liquid storage tank, valves, and a ceramic filter screen.

[0009] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0010] This utility model is a single riser casting sand mold, including a cavity, a sprue, and a pouring cup; two sprues are symmetrically arranged on the periphery of the cavity, and a pouring cup is arranged above the higher end of the sprue;

[0011] Two sets of inclined ingates are symmetrically arranged around the cavity, and the ingates are fixedly connected to the cavity. Each set of ingates is fixedly connected to a horizontal runner at its higher end. The side of the horizontal runner away from the ingate is fixedly connected to the lower end of the inclined runner.

[0012] The molten metal is added from the spout of the pouring cup and then enters the mold cavity through the sprue, runner, and ingate to solidify. The sloping design of the sprue and ingate makes it less likely for gas to be entangled during the pouring process, reducing the possibility of porosity on the casting surface. At the same time, the arrangement of two pouring cups, two sprues, two runners, and two sets of ingates greatly increases the pouring speed. When pouring thin-walled and complex parts, the pouring can be completed more quickly, and cold shuts are less likely to occur.

[0013] The pouring cup includes a conical inlet, a liquid storage tank is fixedly connected to the top of the inlet, an outlet is fixedly connected to the bottom of the inlet, and a valve is fixedly connected to the bottom of the outlet.

[0014] The design of the molten metal storage tank allows the pouring cup to hold more molten metal. During the pouring process, molten metal is first added to the storage tank and the pouring cup through the opening at the top of the storage tank. When the added molten metal reaches a certain volume, the valve is opened according to the required pouring flow rate, allowing the molten metal to enter the mold cavity through the sprue, runner, and ingate at a specific flow rate for solidification. This prevents uneven flow rate of the molten metal when it is poured directly by hand, which could lead to turbulence and bubble formation. It also avoids splashing and overflow of molten metal when it is added directly to the pouring cup.

[0015] Furthermore, a feeding riser is fixedly connected through the center of the top of the cavity, and an air outlet is fixedly connected through the top of the cavity on one side of the feeding riser.

[0016] Feeding risers can compensate for the volume shrinkage of castings during solidification, and also serve the functions of venting and slag collection. Vent holes are set to discharge air bubbles generated during the pouring of molten metal, preventing air bubbles from affecting the casting and causing the formed casting to contain pores.

[0017] Furthermore, a curved sprue is fixedly connected to the higher end of the inclined sprue, and the higher end of the curved sprue is fixedly connected to the bottom end of the valve.

[0018] The curved runner connects the valve and the sprue, preventing the molten metal flowing from the pouring cup from directly impacting the inner wall of the sprue as it enters, thus avoiding turbulence and the formation of bubbles.

[0019] Furthermore, the valve includes a valve body, a valve plate, a valve stem, and a handle. The top end of the valve body is fixedly connected to the bottom end of the outlet, and the bottom end of the valve body is fixedly connected to the higher end of the curved runner. The valve plate is located inside the valve body, and the cross-sectional dimensions of the valve plate are consistent with the cross-sectional dimensions of the internal channel of the valve body. One end of the valve stem passes through the valve body and the valve plate and extends into the valve plate and is fixedly connected to the valve plate. The end of the valve stem away from the valve plate extends out of the valve body and is fixedly connected to the handle.

[0020] The top of the valve body is fixedly connected to the bottom of the outlet, and the bottom is fixedly connected to the higher end of the curved runner, so that the molten metal will not splash out when it enters the inclined runner from the pouring cup. The valve plate is designed so that the molten metal in the metal cup will not flow down when the valve is closed. As needed, the handle is turned to drive the valve rod and valve plate to rotate, so that the molten metal stored in the pouring cup and the storage tank can be released at a specific flow rate.

[0021] Furthermore, a ceramic filter screen is provided inside the pouring cup, and the outer periphery of the ceramic filter screen is attached to the lower inner wall of the liquid inlet and the upper inner wall of the liquid outlet.

[0022] The molten metal must pass through a ceramic filter screen before entering the sprue from the pouring cup, and then through the sprue, runner and ingate into the mold cavity. The ceramic filter screen can filter impurities in the molten metal, thereby enhancing the strength of the molded casting and improving its quality.

[0023] This utility model has the following beneficial effects:

[0024] This invention solves the problem of air bubbles generated during the addition of molten metal by setting an inclined sprue and an inclined ingate. With the inclined sprue, the molten metal enters the cavity at a certain angle, avoiding turbulence and reducing the possibility of gas being drawn into the molten metal. At the same time, the flow of molten iron in the cavity is more stable, which is conducive to the discharge of gas from the pores, thereby reducing the risk of pores on the surface of the molded casting.

[0025] This invention solves the problem of slow pouring speed by setting two sloping sprues, two horizontal sprues, and two sets of ingates. Molten iron is added from the two sloping sprues and enters the mold cavity through the two horizontal sprues and the two sets of ingates, which speeds up the pouring speed, prevents the molten metal from solidifying prematurely, reduces cold shuts, and achieves the purpose of speeding up the pouring speed.

[0026] This invention solves the problem of uneven metal molten material addition during the pouring process by setting up a pouring cup, a storage tank, and a valve. The metal molten material is added to the pouring cup in advance and stored in the storage tank and pouring cup. When the metal molten material reaches a certain volume, the valve is opened according to the required flow rate to control the flow rate of the metal molten material.

[0027] This invention solves the problem of impurities in molten metal entering the mold cavity by setting a ceramic filter screen. Only molten metal that has been filtered by the ceramic filter screen can enter the mold cavity. Impurities are blocked by the ceramic filter screen, thereby achieving the purpose of removing impurities from the molten metal, enhancing the strength of the molded casting, and improving the quality of the casting.

[0028] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a single-riser casting sand mold.

[0031] Figure 2 This is a schematic diagram of the connection structure of the sprue, valve, and pouring cup.

[0032] Figure 3 This is a schematic diagram of the connection structure of the curved runner, valve, and pouring cup.

[0033] Figure 4 for Figure 3 A cross-sectional view.

[0034] Figure 5 This is a cross-sectional view of the pouring cup and its associated components.

[0035] Figure 6 for Figure 4 Enlarged view of the structure at point A in the middle.

[0036] The attached diagram lists the components represented by each number as follows:

[0037] 1. Cavity; 101. Feeding riser; 102. Vent hole; 103. Ingate; 2. Angled sprue; 201. Curved sprue; 202. Horizontal sprue; 3. Sprue cup; 301. Liquid inlet; 302. Liquid outlet; 303. Liquid storage tank; 304. Ceramic filter screen; 4. Valve; 401. Valve body; 402. Valve plate; 403. Valve stem; 404. Handle. Detailed Implementation

[0038] 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 skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation Example 1

[0039] Please see Figure 1 This utility model is a single riser casting sand mold, including a cavity 1, a sprue 2 and a pouring cup 3; two sprues 2 are symmetrically arranged around the cavity 1, and a pouring cup 3 is arranged above the higher end of the sprue 2;

[0040] Two sets of inclined ingates 103 are symmetrically arranged around the cavity 1, and the ingates 103 are fixedly connected to the cavity 1. The higher end of each set of ingates 103 is fixedly connected to a horizontal runner 202. The side of the horizontal runner 202 away from the ingates 103 is fixedly connected to the lower end of the inclined runner 2.

[0041] During the casting process, molten metal is added through the spout of the pouring cup 3. The molten metal then enters the mold cavity 1 through the sprue 2, the runner 202, and the ingate 103 to solidify, ultimately forming the molded casting. The sloping arrangement of the sprue 2 and the ingate 103 prevents the molten metal from directly impacting the runner 202 and the mold cavity 1 during the process of the molten metal entering the runner 202 from the sprue 2 and entering the mold cavity 1 from the ingate 103, thus reducing the possibility of gas generation and the formation of pores on the surface of the casting. At the same time, the arrangement of two pouring cups 3, two sprue 2, two runner 202, and two sets of ingates 103 allows for simultaneous casting from two directions, greatly increasing the casting speed. When casting thin-walled and complex parts, the casting process can be completed more quickly, and cold shuts are less likely to occur.

[0042] Among them, such as Figure 1 As shown, a feeding riser 101 is fixedly connected through to the center of the top of the cavity 1, and an air outlet 102 is fixedly connected through to the top of the cavity 1 on one side of the feeding riser 101.

[0043] The feeding riser 101 maintains the liquid phase supply during the solidification of the casting by storing liquid metal, effectively compensating for volume shrinkage. By extending the feeding channel to maintain the liquid metal, it ensures uniform shrinkage of all parts of the casting, while also serving the functions of venting and slag collection. The vent hole 102 is designed to discharge air bubbles generated during the pouring of molten metal, preventing air bubbles from affecting the casting and causing the formed casting to contain pores.

[0044] Among them, such as Figure 1-2 As shown, a curved sprue 201 is fixedly connected to the higher end of the inclined sprue 2, and a ceramic filter 304 is provided inside the pouring cup 3. The outer periphery of the ceramic filter 304 is attached to the lower inner wall of the liquid inlet 301 and the upper inner wall of the liquid outlet 302.

[0045] The curved sprue 201 prevents the molten metal from directly impacting the sprue 2 as it enters from the pouring cup 3, thus preventing the formation of air bubbles. The ceramic filter 304 ensures that the molten metal must pass through the ceramic filter 304 before entering the sprue 2 from the pouring cup 3, and then through the sprue 2, the horizontal sprue 202, and the ingate 103 into the mold cavity 1. The ceramic filter 304 can filter impurities in the molten metal, thereby enhancing the strength of the molded casting and improving its quality.

[0046] The working principle of this embodiment is as follows: When performing the casting operation, molten metal is added from the mouth of one of the pouring cups 3. Under the action of gravity, the molten metal first passes through the ceramic filter screen 304 to remove impurities, and then enters the cavity 1 through the curved runner 201, the inclined runner 2, the horizontal runner 202 and the ingate 103 in sequence. During this process, the gas generated is discharged from the vent hole 102. Finally, after being fed by the riser, the molten metal solidifies into a shaped casting. If it is necessary to cast thin-walled parts or complex parts, molten metal is added from the mouths of the two pouring cups 3 respectively to perform the casting operation. Specific Implementation Example 2

[0047] Please see Figure 1-5 Based on the first specific embodiment, the pouring cup 3 includes a conical inlet 301, a liquid storage tank 303 is fixedly connected to the top of the inlet 301, an outlet 302 is fixedly connected to the bottom of the inlet 301, and a valve 4 is fixedly connected to the bottom of the outlet 302.

[0048] The design of the liquid storage tank 303 allows the pouring cup 3 to store more molten metal. Furthermore, the depth of the liquid storage tank 303 prevents splashing when molten metal is added. During the pouring process, molten metal is first added to the liquid storage tank 303 and the pouring cup 3 through the top opening. When the added molten metal reaches a certain volume, valve 4 is opened according to the required pouring flow rate, allowing more molten metal to be added. This ensures that the molten metal flows through the sprue 2, the grate 202, and the ingate 103 at a specific flow rate into the mold cavity 1 for solidification. This avoids uneven flow rates caused by manually pouring molten metal, which can lead to turbulence and bubble formation. It also prevents molten metal from splashing and overflowing when directly added to the pouring cup 3.

[0049] Among them, such as Figure 1-4As shown, the higher end of the curved sprue 201 is fixedly connected to the lower end of the valve 4; the curved sprue 201 connects the valve 4 and the inclined sprue 2, making the process of the molten metal entering the inclined sprue 2 through the valve 4 smoother, and will not directly impact the inner wall of the inclined sprue 2, thus avoiding turbulence and the generation of bubbles.

[0050] Among them, such as Figure 1-6 As shown, valve 4 includes valve body 401, valve plate 402, valve stem 403 and handle 404. The top end of valve body 401 is fixedly connected to the bottom end of outlet 302, and the bottom end of valve body 401 is fixedly connected to the higher end of curved sprue 201. Valve plate 402 is located inside valve body 401, and the cross-sectional dimensions of valve plate 402 are consistent with the cross-sectional dimensions of the internal channel of valve body 401. One end of valve stem 403 passes through valve body 401 and valve plate 402 and extends into valve plate 402 and is fixedly connected to valve plate 402. The other end of valve stem 403 away from valve plate 402 extends out of valve body 401 and is fixedly connected to handle 404.

[0051] The top of the valve body 401 is fixedly connected to the bottom of the outlet 302, and the bottom is fixedly connected to the higher end of the curved sprue 201, so that the molten metal will not splash out when it enters the curved sprue 201 and the sloping sprue 2 from the pouring cup 3. At the same time, the valve plate 402 is set so that when the valve 4 is closed, the molten metal in the metal cup will not flow directly to the curved sprue 201. When it is necessary to release the molten metal, the handle 404 is turned according to the flow rate of the molten metal. The rotation of the handle 404 drives the valve rod 403 and the valve plate 402 to rotate, and the molten metal can flow through the gap between the valve plate 402 and the valve body 401 to the curved sprue 201 at a specific flow rate, and then enter the sloping sprue 2 through the curved sprue 201 to complete the subsequent pouring work.

[0052] The working principle of this embodiment is as follows: When performing the pouring operation, molten metal is first added to the storage tank 303 and the pouring cup 3. When the molten metal reaches a certain volume, the handle 404 is turned as needed to drive the valve stem 403 and the valve plate 402 to rotate. The molten metal can then flow through the gap between the valve plate 402 and the valve body 401 to the curved runner 201 at a specific flow rate. Molten metal is then added to the storage tank 303 and the pouring cup 3. The molten metal enters the cavity 1 through the curved runner 201, the inclined runner 2, the horizontal runner 202 and the ingate 103 to complete the pouring operation.

[0053] The above are merely preferred embodiments of the present utility model and do not limit the present utility model. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present utility model.

Claims

1. A single-riser casting sand mold, comprising a cavity (1), a sprue (2), and a pouring cup (3); characterized in that: The cavity (1) is symmetrically provided with two inclined runners (2) on its periphery, and a pouring cup (3) is provided above the higher end of the inclined runner (2); Two sets of inclined ingates (103) are symmetrically arranged around the cavity (1), and the ingates (103) are fixedly connected to the cavity (1) in a through manner. Each set of ingates (103) has a horizontal runner (202) fixedly connected to its higher end in a through manner. The side of the horizontal runner (202) away from the ingates (103) is fixedly connected to the lower end of the inclined runner (2) in a through manner. The pouring cup (3) includes a conical inlet (301), with a liquid storage tank (303) fixedly connected to the top of the inlet (301), and an outlet (302) fixedly connected to the bottom of the inlet (301), with a valve (4) fixedly connected to the bottom of the outlet (302).

2. The single-riseer casting sand mold according to claim 1, characterized in that: A feeding riser (101) is fixedly connected through the center of the top of the cavity (1), and an air outlet (102) is fixedly connected through the top of the cavity (1) on one side of the feeding riser (101).

3. A single-riser casting sand mold according to claim 1, characterized in that: The higher end of the inclined gating (2) is fixedly connected to a curved gating (201), and the higher end of the curved gating (201) is fixedly connected to the bottom end of the valve (4).

4. A single-riser casting sand mold according to claim 1, characterized in that: The valve (4) includes a valve body (401), a valve plate (402), a valve stem (403), and a handle (404). The top of the valve body (401) is fixedly connected to the bottom of the outlet (302), and the bottom of the valve body (401) is fixedly connected to the higher end of the curved gating (201). The valve plate (402) is located inside the valve body (401), and the cross-sectional dimensions of the valve plate (402) are consistent with the cross-sectional dimensions of the internal channel of the valve body (401). One end of the valve stem (403) passes through the valve body (401) and the valve plate (402) and extends into the valve plate (402) and is fixedly connected to the valve plate (402). The other end of the valve stem (403) away from the valve plate (402) extends out of the valve body (401) and is fixedly connected to the handle (404).

5. A single-riser casting sand mold according to claim 1, characterized in that: The pouring cup (3) is provided with a ceramic filter screen (304) inside, and the outer periphery of the ceramic filter screen (304) is attached to the lower inner wall of the liquid inlet (301) and the upper inner wall of the liquid outlet (302).

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