Sand-casting test specimen pouring system and sand-casting test specimen molding method

Abstract

The present disclosure relates to the technical field of casting. Provided are a sand-casting test specimen pouring system and a sand-casting test specimen molding method. The sand-casting test specimen pouring system comprises a sprue, a flow-stabilizing ring groove, a plurality of runners and a plurality of mold cavities, wherein the sprue is connected to the flow-stabilizing ring groove; the plurality of runners are uniformly arranged on the periphery of the flow-stabilizing ring groove at intervals; and the plurality of mold cavities are correspondingly connected to the plurality of runners on a one-to-one basis, the cross-sectional dimensions of the plurality of mold cavities being different from each other. Compared with the prior art, the present disclosure realizes the mutually independent arrangement of the plurality of mold cavities, and allows for the simultaneous preparation of test specimens having various wall thicknesses. Different mold cavities are independent of each other, and the runners are uniformly arranged, such that the temperatures of molten metal when arriving at ingates are similar, thereby eliminating the impact of uncontrollable factors on experimental results to the greatest extent. By means of one instance of pouring, test specimens under various cooling rate conditions can be obtained, thereby improving efficiency and saving costs, and also ensuring the stability of output data and the accuracy and reliability of experimental analysis conclusions.

Description

Sand casting test sample pouring system and sand casting test sample forming method

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202410849743X entitled "Sand casting test sample pouring system and sand casting test sample forming method" filed on June 27, 2024 with the China Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present disclosure relates to the field of casting technology, in particular, to a sand casting test sample pouring system and a sand casting test sample forming method. BACKGROUND

[0004] In the process of casting aluminum alloy, the cooling conditions of the molten aluminum at different wall thickness positions of the casting are different, which in turn affects the mechanical properties of the material at that position. In order to study the influence of different cooling conditions on the structure and properties of aluminum alloy, and then guide the regulation of product performance in actual production, it is necessary to design an experimental mold or device that can produce different cooling rates during pouring.

[0005] In the prior art, wedge-shaped molds, stepped molds, gradient solidification devices and directional solidification devices are often used to achieve the above purpose. Gradient solidification devices have complex structures and low efficiency in preparing test samples, so they are usually not used for test sample preparation. Although wedge-shaped molds, stepped molds and directional solidification devices can produce different cooling rates in the same casting, there is exchange of matter and energy between different parts of the casting during solidification, which will interfere with the analysis of the relationship between cooling conditions, material structure and mechanical properties. In addition, when analyzing and detecting, samples need to be taken from the casting. Since different parts of the casting are connected and influence each other, the microstructure of the sampled part may not be uniform, and the structure characteristics of the adjacent area are mixed, which makes it difficult to accurately reflect the relationship between process and structure performance, and brings difficulties to subsequent analysis. Moreover, in the pouring process, the thin wall part of the casting in the stepped mold is usually located at the distal end of the sprue. When the molten aluminum reaches this position, the temperature has dropped compared to the proximal end of the sprue. This is not conducive to the control of the solidification temperature at different positions of the casting, and also increases the difficulty of filling the thin wall area of the casting at the distal end of the sprue.

[0006] SUMMARY

[0007] The purpose of the present disclosure includes, for example, providing a sand casting sample pouring system and a sand casting sample forming method, which can simultaneously prepare a sand casting process of multiple wall thickness samples, and the temperature state of the molten metal reaching each ingate is similar, thereby eliminating the influence of uncontrollable factors on the experimental results to the greatest extent. Through one pouring, samples under multiple cooling speed conditions can be obtained, which can improve the efficiency, save the cost, ensure the stability of the output data, and ensure the accuracy and reliability of the experimental analysis conclusion.

[0008] Embodiments of the present disclosure can be implemented as follows:

[0009] In a first aspect, the present disclosure provides a sand casting sample pouring system, comprising a sprue, a flow stabilizing ring groove, multiple transverse gates and multiple cavities. One end of the sprue is provided with a liquid inlet for the molten metal to flow in, and the other end is connected to the flow stabilizing ring groove. Multiple transverse gates are uniformly and spacedly arranged around the flow stabilizing ring groove. Multiple cavities are one-to-one connected to multiple transverse gates and extend away from the liquid inlet. The cross-sectional dimensions of multiple cavities are different.

[0010] In an optional embodiment, multiple transverse gates are distributed in a diverging manner around the flow stabilizing ring groove. One end of each transverse gate is connected to the outer side of the flow stabilizing ring groove, and the other end extends along the radial direction of the flow stabilizing ring groove. Multiple cavities are one-to-one connected to the middle part of multiple transverse gates.

[0011] In an optional embodiment, one end of each transverse gate away from the flow stabilizing ring groove is further provided with a slag collecting nest, which is arranged in a bent manner relative to the transverse gate.

[0012] In an optional embodiment, one end of the sprue away from the liquid inlet is further formed with a pressure stabilizing cavity, and the height of the pressure stabilizing cavity relative to the liquid inlet is higher than the height of the flow stabilizing ring groove relative to the liquid inlet.

[0013] In an optional embodiment, the sprue and the flow stabilizing ring groove are concentrically arranged, and multiple bridge gates are uniformly arranged around the sprue, and multiple bridge gates are connected to the inner side of the flow stabilizing ring groove.

[0014] In an optional embodiment, a ceramic filter screen is further arranged in the sprue, and the ceramic filter screen is used to filter the slag in the molten metal.

[0015] In an optional embodiment, the inner diameter of the sprue gradually decreases in the direction away from the liquid inlet, and the circumferential direction of the pressure stabilizing cavity is flush with the circumferential direction of the sprue.

[0016] In an optional embodiment, the plurality of cavities have the same height relative to the runner, and the plurality of cavities have the same width along the radial direction of the steady flow ring groove, and the plurality of cavities have different widths along the circumferential direction of the steady flow ring groove.

[0017] In an optional embodiment, the plurality of cavities have widths along the circumferential direction of the steady flow ring groove that increase in an arithmetic progression.

[0018] In an optional embodiment, each of the cavities is further provided with a riser at an end away from the liquid inlet, and the plurality of risers are flush with each other.

[0019] In a second aspect, the present disclosure provides a sand mold casting sample forming method, which is suitable for the sand mold casting sample pouring system according to any one of the preceding embodiments, and the method comprises:

[0020] Forming a pouring system with a group core;

[0021] Pouring the metal liquid into the liquid inlet by using a low-pressure pouring or gravity pouring process.

[0022] The beneficial effects of the embodiments of the present disclosure include, for example:

[0023] The sand mold casting sample pouring system and the sand mold casting sample forming method provided by the embodiments of the present disclosure are characterized in that the runner is provided with a liquid inlet at one end for the metal liquid to flow in, and the other end is connected to a steady flow ring groove, a plurality of runners are uniformly and spacedly arranged around the steady flow ring groove, a plurality of cavities are one-to-one connected to the plurality of runners and extend away from the liquid inlet, and the cross-sectional dimensions of the plurality of cavities are different. Compared with the prior art, the embodiments of the present disclosure can simultaneously prepare a plurality of wall thickness samples by adding a steady flow ring groove and a plurality of runners to realize the independent arrangement of the plurality of cavities, the different wall thickness samples are independent of each other and are not directly connected, and the runners are uniformly arranged, so that the temperature of the metal liquid reaching the inner gate is similar, and the influence of uncontrollable factors on the experimental results is eliminated to the greatest extent. The samples under a plurality of cooling speed conditions can be obtained by one pouring, which can improve the efficiency, save the cost, and ensure the stability of the output data and the accuracy and reliability of the experimental analysis conclusion. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as a limitation on the scope, and other related drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0025] FIG. 1 is a structural schematic diagram of the sand mold casting sample pouring system provided by the embodiments of the present disclosure in a first perspective view;

[0026] Fig. 2 is a structural schematic diagram of a sand casting test sample pouring system provided by an embodiment of the present disclosure in a second perspective view;

[0027] Fig. 3 is a structural schematic diagram of a sand casting test sample pouring system provided by an embodiment of the present disclosure in a third perspective view.

[0028] Fig. 3 is a structural schematic diagram of a sand casting test sample pouring system provided by an embodiment of the present disclosure in a third perspective view. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only some but not all of the embodiments of the present disclosure. The components of the embodiments of the present disclosure described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the claimed present disclosure, but only represents selected embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative labor are within the scope of protection of the present disclosure.

[0031] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0032] In the description of the present disclosure, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product in use, only for the convenience of describing the present disclosure and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present disclosure.

[0033] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] As disclosed in the background art, the prior art generally uses 1. wedge-shaped die; 2. stepped die; 3. gradient solidification device; 4. directional solidification device to carry out solidification experiments. The wedge-shaped die produces continuously changing thickness in the casting, and the thicker part of the casting cools slower during pouring. The stepped die produces step-by-step changing thickness in the casting by designing different height steps, and the thicker part of the casting cools slower during pouring. The gradient solidification device produces different cooling rates by controlling the rate at which the sample is pulled out of the heating furnace. The directional solidification device makes the sample solidify from bottom to top through the cooling system at the bottom of the sample, and the part of the sample farther away from the cooling system cools slower.

[0035] However, the solidification experiment method in the prior art has the following disadvantages:

[0036] 1. The gradient solidification device and the directional solidification device are complex in equipment and low in efficiency in preparing samples.

[0037] 2. The prior art (wedge-shaped die, stepped die, directional solidification device) can produce different cooling rates in the same casting, but there is exchange of matter and energy between different parts of the casting during solidification, which will interfere with the subsequent analysis of the relationship between cooling conditions, material organization and mechanical properties. In addition, when performing analysis and detection, samples need to be taken from the casting. Due to the communication and influence between different parts of the casting, the microstructure of the sampled part may not be uniform, having the organizational characteristics of the adjacent area, which leads to the inability to accurately reflect the relationship between process and organizational performance, and brings difficulties to subsequent analysis.

[0038] 3. In the prior art (stepped die), the thin-walled part of the casting is usually located at the distal end of the sprue during pouring, and the temperature of the liquid aluminum has dropped compared to the proximal end of the sprue when it reaches there. This is not conducive to the control of the solidification temperature of different positions of the casting, and also increases the difficulty of filling the thin-walled area of the casting at the distal end of the sprue.

[0039] In order to solve the above problems, the embodiments of the present disclosure provide a sand casting sample pouring system and a sand casting sample forming method. It should be noted that the features in the embodiments of the present disclosure can be combined with each other without conflict.

[0040] Please refer to FIGS. 1-3, the present embodiment provides a sand casting sample pouring system 100, which can simultaneously prepare sand casting processes of multiple wall thickness samples, and the temperature state of the metal liquid reaching each ingate is similar, thereby eliminating the influence of uncontrollable factors on the experimental results to the greatest extent. Through one pouring, samples under multiple cooling speed conditions can be obtained, which improves the efficiency, saves the cost, and ensures the stability of the output data and the accuracy and reliability of the experimental analysis conclusion.

[0041] The sand casting sample pouring system 100 provided by the embodiment comprises a sprue 110, a steady flow ring groove 130, a plurality of runners 150 and a plurality of cavities 170. The sprue 110 is provided with a liquid inlet at one end for metal liquid to flow in, and is connected to the steady flow ring groove 130 at the other end. The plurality of runners 150 are uniformly and spacedly arranged around the steady flow ring groove 130. The plurality of cavities 170 are one-to-one correspondingly connected to the plurality of runners 150 and extend away from the liquid inlet, wherein the cross-sectional dimensions of the plurality of cavities 170 are different.

[0042] In the embodiment, the steady flow ring groove 130 is additionally arranged, and the plurality of runners 150 are arranged to realize the independent arrangement of the plurality of cavities 170, so that a plurality of wall thickness samples can be prepared at the same time. The different wall thickness samples are independent of each other and are not directly connected. The runners 150 are uniformly arranged, the temperature of the metal liquid reaching the ingates is similar, and the influence of uncontrollable factors on the experimental results is eliminated to the greatest extent. The samples under a plurality of cooling speed conditions can be obtained by one pouring, which improves the efficiency, saves the cost, and ensures the stability of the output data and the accuracy and reliability of the experimental analysis conclusion.

[0043] It is worth noting that the liquid inlet is located at the bottom end of the sprue 110 in the embodiment, and low-pressure pouring process can be used during pouring to ensure the pouring effect. Of course, other pouring processes such as gravity pouring process can also be used for pouring, which is not limited here.

[0044] In the embodiment, the plurality of runners 150 are distributed in a diverging manner around the steady flow ring groove 130. One end of each runner 150 is connected to the outer side of the steady flow ring groove 130, the other end extends along the radial direction of the steady flow ring groove 130, and the plurality of cavities 170 are one-to-one correspondingly connected to the middle parts of the plurality of runners 150. Specifically, the steady flow ring groove 130 is in the form of a circular ring, the number of runners 150 can be 12, the number of cavities 170 is the same as that of the runners 150, and the cavities 170 are one-to-one correspondingly arranged. The extension direction of the runner 150 coincides with the diameter direction of the steady flow ring groove 130, and the plurality of cavities 170 are uniformly distributed, so that the uniform flow of the metal liquid can be ensured, and the temperature of the metal liquid flowing into the cavities 170 is further ensured to be similar.

[0045] It should be noted that the plurality of cavities 170 are arranged along the same circle in the embodiment, and the circle is concentric with the sprue 110. The bottom end of each cavity 170 is provided with an ingate in the embodiment, and the metal liquid in the runner 150 can flow into the cavity 170 through the ingate.

[0046] In the embodiment, each of the runner 150 is further provided with a slag pocket 151 at the end away from the steady flow ring groove 130, and the slag pocket 151 is arranged in a bent manner relative to the runner 150. Specifically, the slag pocket 151 is located at the end of the runner 150, and in the pouring process, the metal liquid will first enter the runner 150, and the slag carried by the front end of the metal liquid will flow to the slag pocket 151 at the end of the runner 150 first, so as to ensure that the clean metal liquid flows into each cavity 170 through the sprue respectively and fills the cavity slowly from bottom to top.

[0047] It should be noted that the slag pocket 151 is upwardly curved relative to the runner 150 and smoothly transitions with the runner 150, which can ensure that the front end of the metal liquid flows to the slag pocket 151 first and carries the slag to the slag pocket 151, and the sprue of the cavity 170 is located in the middle of the runner 150 and is spaced from the slag pocket 151, which can avoid the backflow of the slag and further ensure that the clean metal liquid enters the cavity 170 through the sprue.

[0048] In the embodiment, the straight runner 110 is further formed with a pressure stabilizing cavity 111 at the end away from the liquid inlet, and the height of the pressure stabilizing cavity 111 relative to the liquid inlet is higher than the height of the steady flow ring groove 130 relative to the liquid inlet. Specifically, the pressure stabilizing cavity 111 is located at the center of the steady flow ring groove 130 and extends upward, which can play a pressure stabilizing role and ensure that the metal liquid smoothly enters the steady flow ring groove 130 from the straight runner 110.

[0049] Further, the straight runner 110 is concentrically arranged with the steady flow ring groove 130, and a plurality of bridge runners 115 are uniformly arranged around the straight runner 110, and the plurality of bridge runners 115 are connected to the inner side of the steady flow ring groove 130. Specifically, the bridge runner 115 can be six, and the six bridge runners 115 are uniformly distributed around the straight runner 110, wherein the bridge runner 115 is located at the connection between the straight runner 110 and the pressure stabilizing cavity 111 and extends in the horizontal direction radially, so that the metal liquid can flow to the steady flow ring groove 130, and after being buffered and stabilized by the steady flow ring groove 130, the metal liquid uniformly flows to the plurality of runners 150.

[0050] In the embodiment, the straight runner 110 is further provided with a ceramic filter screen 113, and the ceramic filter screen 113 is used to filter the slag in the metal liquid. Specifically, the ceramic filter screen 113 can be embedded at one end of the straight runner 110 close to the bridge runner 115, and the ceramic filter screen 113 can filter the slag in the metal liquid, so that the relatively clean metal liquid can flow smoothly into the steady flow ring groove 130 and the pressure stabilizing cavity 111.

[0051] In the embodiment, the inner diameter of the sprue 110 gradually decreases in the direction away from the liquid inlet, and the circumferential direction of the steady pressure cavity 111 is flush with the circumferential direction of the sprue 110. Specifically, the inner diameter of the sprue 110 gradually decreases, so that the metal liquid can quickly fill after entering the sprue 110 and flow upward, and the slanted side wall can also block as many impurities and slag in the front end metal liquid as possible, avoiding a large amount of impurities and slag from entering the ceramic filter screen 113 and causing it to be blocked.

[0052] In the embodiment, the heights of the plurality of cavities 170 relative to the cross sprue 150 are the same, and the radial widths of the plurality of cavities 170 along the steady flow ring groove 130 are the same, and the circumferential widths of the plurality of cavities 170 along the steady flow ring groove 130 are different. Specifically, the height and the radial width of the cavity 170 are the same, so that the flow rate of the metal liquid filled in the plurality of cavities 170 is the same, and the circumferential width is different, so that sample castings with different wall thicknesses can be realized. Moreover, because a multi-cavity design is adopted and different sizes of cavities 170 are designed according to different wall thickness samples, a plurality of samples under different cooling speed conditions can be obtained by one pouring, improving the sample preparation efficiency.

[0053] Specifically, the circumferential widths of the plurality of cavities 170 along the steady flow ring groove 130 are in an arithmetic progression. For example, the plurality of cavities 170 can be 12, and every 4 cavities form a group. The widths (i.e. wall thicknesses) of the cavities 170 in each group can be in an arithmetic progression, for example, 3mm, 5mm, 7mm, 9mm, and so on, so that cavities 170 with an arithmetic progression of wall thicknesses can be realized.

[0054] Further, each cavity 170 is further provided with a riser 190 away from the liquid inlet, and the plurality of risers 190 are flush with each other. Specifically, the size of the riser 190 cup is larger than the size of the corresponding cavity 170.

[0055] The sand casting sample forming method provided by the embodiment of the present disclosure is suitable for the sand casting sample pouring system 100 described above, and the method comprises the following steps:

[0056] S1: Design cavities 170 with different sizes.

[0057] S2: Form a pouring system by assembling cores.

[0058] S3: Pour metal liquid into the liquid inlet by using a low-pressure pouring or gravity pouring process.

[0059] Specifically, first, a plurality of sample cavities 170 of different thicknesses can be designed, the design process can be simulation data, then a mold is designed according to the simulation data, and then a core is assembled to form a pouring system, and finally a pouring process is performed. When the metal liquid fills the mold, the metal liquid flows into the inlet of the straight sprue 110, and after passing through the ceramic filter screen 113, the slag in the metal liquid is filtered. The metal liquid continues to flow smoothly into the steady flow ring groove 130 and the pressure stabilizing cavity 111 at the upper part of the straight sprue 110. After the steady flow ring groove 130 is filled, the metal liquid flows into the cross sprue 150. At this time, the slag washed away by the front end of the metal liquid will flow to the slag collecting hole 151 at the edge of the cross sprue 150 first, and the clean metal liquid will flow into each sample cavity 170 from the ingates respectively, and slowly fill the mold from bottom to top.

[0060] It should be noted that, because the embodiment adopts a one-piece multi-mold design and different sizes of cavities 170 are designed according to different wall thickness samples, a plurality of samples under different cooling speed conditions can be obtained through one pouring, thereby improving the sample preparation efficiency. In addition, because the different sample cavities 170 are not directly connected to each other, the solidification process of each sample is independent of each other and does not interfere with each other, which is conducive to controlling experimental variables and obtaining reliable experimental data. Moreover, because the sample cavities 170 are arranged at equal distances around the straight sprue 110, the temperature and other conditions of the metal liquid reaching the ingates of each cavity 170 are similar, which is conducive to controlling experimental variables and obtaining stable experimental data.

[0061] In terms of test results, the filling and solidification simulation using the simulation software AnyCasting shows that: 1. The solidification time of samples of different thicknesses is different. The thicker the sample, the slower the cooling rate, and the longer the time required for solidification. 2. During the filling process, the temperature of the aluminum liquid reaching the ingates of each cavity 170 is similar.

[0062] In summary, the sand casting sample pouring system 100 and the sand casting sample forming method provided by the embodiment are characterized in that: the straight sprue 110 is provided with an inlet at one end for the metal liquid to flow in, and is connected to the steady flow ring groove 130 at the other end. A plurality of cross sprues 150 are uniformly and spacedly arranged around the steady flow ring groove 130, and a plurality of cavities 170 are correspondingly connected to the plurality of cross sprues 150 and extend away from the inlet, wherein the cross sections of the plurality of cavities 170 are of different sizes. Compared with the prior art, the embodiment of the disclosure adds the steady flow ring groove 130, and realizes the independent arrangement of the plurality of cavities 170 through the plurality of cross sprues 150, so that a plurality of samples of different thicknesses can be prepared at the same time. The different thickness samples are independent of each other and are not directly connected, and the cross sprues 150 are uniformly arranged, so that the temperature of the metal liquid reaching the ingates is similar, thereby eliminating the influence of uncontrollable factors on the experimental results to the greatest extent. Through one pouring, samples under a plurality of cooling speed conditions can be obtained, which improves the efficiency and saves the cost, while ensuring the stability of the output data and the accuracy and reliability of the experimental analysis conclusion.

[0063] The above merely provides a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims. Industrial applicability

[0064] The sand casting sample pouring system and the sand casting sample forming method provided by the present disclosure realize the independent arrangement of multiple cavities, can simultaneously prepare multiple wall thickness samples, the cavities are independent of each other, the cross gates are uniformly arranged, the temperature of the molten metal reaching the ingates is similar, and the influence of uncontrollable factors on the experimental results is eliminated to the greatest extent. Through one pouring, samples under multiple cooling speed conditions can be obtained, which can improve the efficiency, save the cost, ensure the stability of the output data, and ensure the accuracy and reliability of the experimental analysis conclusion.

Claims

1. A sand casting sample pouring system, characterized in that, It includes a sprue, a flow-stabilizing ring groove, multiple horizontal runners, and multiple cavities. One end of the sprue is provided with an inlet for molten metal to flow in, and the other end is connected to the flow-stabilizing ring groove. The multiple horizontal runners are evenly and spaced around the flow-stabilizing ring groove. The multiple cavities are connected to the multiple horizontal runners one by one and extend in a direction away from the inlet. The cross-sectional dimensions of the multiple cavities are different.

2. The sand casting sample pouring system according to claim 1, characterized in that, Multiple horizontal runners are distributed in a radiating pattern around the flow-stabilizing ring groove. One end of each horizontal runner is connected to the outer side of the flow-stabilizing ring groove, and the other end extends radially along the flow-stabilizing ring groove. Multiple cavities are connected one-to-one to the middle of the multiple horizontal runners.

3. The sand casting sample pouring system according to claim 2, characterized in that, Each of the horizontal pouring channels is also provided with a slag collection pit at the end away from the flow stabilizing ring groove, and the slag collection pit is bent relative to the horizontal pouring channel.

4. The sand casting sample pouring system according to claim 1, characterized in that, A pressure-stabilizing cavity is also formed at the end of the straight gating channel away from the liquid inlet, and the height of the pressure-stabilizing cavity relative to the liquid inlet is higher than the height of the flow-stabilizing ring groove relative to the liquid inlet.

5. The sand casting sample pouring system according to claim 4, characterized in that, The direct pouring channel is concentrically arranged with the flow stabilizing ring groove, and multiple bridging channels are evenly arranged around the direct pouring channel, with the multiple bridging channels connected to the inner side of the flow stabilizing ring groove.

6. The sand casting sample pouring system according to claim 4, characterized in that, The direct casting channel is also equipped with a ceramic filter screen, which is used to filter out inclusions in the molten metal.

7. The sand casting sample pouring system according to claim 4, characterized in that, The inner diameter of the sprue gradually decreases in the direction away from the liquid inlet, and the circumference of the pressure stabilizing cavity is flush with the circumference of the sprue.

8. The sand casting sample pouring system according to claim 1, characterized in that, The plurality of cavities have the same height relative to the horizontal runner, and the plurality of cavities have the same radial width along the flow-stabilizing ring groove, while the plurality of cavities have different circumferential widths along the flow-stabilizing ring groove.

9. The sand casting sample pouring system according to claim 8, characterized in that, The widths of the plurality of cavities increase arithmetically along the circumferential direction of the flow-stabilizing annular groove.

10. A method for forming sand casting specimens, applicable to the sand casting specimen pouring system as described in any one of claims 1-9, characterized in that, The method includes: Core components form the gating system; Molten metal is poured into the inlet using low-pressure casting or gravity casting processes.

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