Die for evaluating performance of die-casting aluminum alloy

Abstract

The invention discloses a die for evaluating the performance of die-casting aluminum alloy, which comprises a movable die and a static die, and the movable die comprises a die frame and a die core mounted in the die frame. The die core is provided with a sprue spreader for receiving a liquid aluminum alloy material, a test runner for testing the fluidity of the liquid aluminum alloy material, an exhaust runner for exhausting gas generated in the test runner, and a vacuum mechanism for enabling the test runner to form a vacuum state, which are connected in sequence; and a hot cracking island for testing the hot cracking tendency is arranged on the test runner. The fluidity of a liquid aluminum alloy material is tested by arranging the test flow channel, the test flow channel can form a die-casting aluminum alloy sample in a vacuum state and a non-vacuum state through the vacuum mechanism, and the die-casting aluminum alloy sample in a target shape can be cut out from the test flow channel to be tested; the mechanical property, the microstructure and the casting defect of a die-casting aluminum alloy sample are detected, and the hot cracking tendency is tested by arranging a hot cracking island on a test runner.

Description

Technical Field

[0001] The invention relates to the technical field of die-casting aluminum alloy performance evaluation dies, and in particular to a die for evaluating the performance of die-casting aluminum alloys. Background Art

[0002] With the continuous development of the automotive industry, the market share of new energy vehicles (NEVs) continues to rise. Data shows that NEVs accounted for 12.1% of the Chinese market in 2021 and reached 25.6% in 2022. Because the range of NEVs is one of the most important factors for customers, and vehicle weight significantly impacts this range, the demand for lightweighting is even more pressing in NEVs. An increasing number of lightweighting technologies are being applied to NEVs for the first time, with large, one-piece die-cast aluminum alloy structural components being one of the most popular lightweighting technologies of the past five years.

[0003] As the size of one-piece die-cast parts increases significantly, heat-treated aluminum alloys used in traditional die-cast parts cannot be used because they cause significant deformation after heat treatment. Consequently, new aluminum alloys suitable for large, one-piece die-cast parts are being developed and introduced to the market by various companies. Evaluating the comprehensive performance of these new aluminum alloys, particularly their casting processability and mechanical properties, to ensure the feasibility of part production and application has become a key issue in the automotive lightweighting sector. Summary of the Invention

[0004] The present invention provides a die for evaluating the performance of die-cast aluminum alloy, comprising a movable die and a static die, wherein the movable die comprises a die frame and a die core installed in the die frame;

[0005] The mold core is provided with a diverter cone for receiving liquid aluminum alloy material, a test flow channel for testing the fluidity of the liquid aluminum alloy material, an exhaust flow channel for discharging the gas generated in the test flow channel, and a vacuum mechanism for forming a vacuum state in the test flow channel, which are connected in sequence. The test flow channel is provided with a thermal cracking island for testing the thermal cracking tendency.

[0006] In one of the optional technical solutions, the test runner includes a main runner connected to the diverter cone and several parallel branch runners connected to the main runner, the near gate of the branch runner is connected to the main runner, and the far gate of the branch runner is connected to the exhaust runner, and the cross-sectional area of each branch runner is different.

[0007] In one of the optional technical solutions, the sub-gating runner has multiple bends, and the sub-gating runner winds from the inside to the outside in a direction from the near gate to the far gate, and the thermal cracking island is arranged at the bend of the sub-gating runner.

[0008] In one of the optional technical solutions, the sub-runner includes a plurality of straight edges with rectangular cross-sections and internal hollowing, and thermal cracking islands with cylindrical thick-wall structures connected to the straight edges are provided between the straight edges.

[0009] In one of the optional technical solutions, the branch runners include at least thin-walled branch runners, medium-walled branch runners and thick-walled branch runners with increasing cross-sectional thickness, which are used to simulate the solidification behavior of liquid aluminum alloy materials under different forming thickness conditions.

[0010] In one of the optional technical solutions, the vacuum mechanism includes a vacuum guide groove and a vacuum valve. The vacuum guide groove is connected to the exhaust flow channel through the vacuum valve. The vacuum guide groove and the vacuum valve are used to extract the air in the test flow channel to form a vacuum state.

[0011] In one of the optional technical solutions, an exhaust deceleration groove is provided between the end of the test flow channel and the exhaust flow channel, and the exhaust deceleration groove is used to slow down the flow rate of the liquid aluminum alloy material to prevent the liquid aluminum alloy material from entering the exhaust flow channel.

[0012] In one of the optional technical solutions, the exhaust flow channel passes through the static mold body and is connected to the external environment to discharge the gas generated during the flow or solidification of the liquid aluminum alloy material.

[0013] In one of the optional technical solutions, a cavity corresponding to the test flow channel structure is provided on the static mold body, which is used to form the shape of the test flow channel during the casting process of the liquid aluminum alloy material.

[0014] In one of the optional technical solutions, a plurality of oil circuits are provided on the movable mold body, and a plurality of pairs of oil circuit connectors are provided on both sides of the movable mold body, and the oil circuit connectors are used to connect to an external vacuum system and / or hydraulic system.

[0015] The above technical solution has the following beneficial effects:

[0016] The technical solution of the present invention provides a mold for evaluating the performance of die-cast aluminum alloys, which tests the fluidity of liquid aluminum alloy materials by setting a test flow channel, and enables the test flow channel to form die-cast aluminum alloy samples in a vacuum state and a non-vacuum state respectively through a vacuum mechanism. The die-cast aluminum alloy samples of the target shape can be intercepted from the test flow channel for testing to detect the mechanical properties, microstructure and casting defects of the die-cast aluminum alloy samples, and the hot cracking tendency is tested by setting a hot cracking island on the test flow channel. The present invention can realize multi-dimensional performance evaluation of one-piece large-scale die-cast aluminum alloy materials in the same mold, and can simultaneously test the fluidity, solidification characteristics, microstructure, casting defects and static properties of the aluminum alloy. It can also compare the performance differences of die-cast aluminum alloy samples formed under vacuum conditions and non-vacuum conditions, thereby establishing the corresponding relationship between the mechanical properties and microstructures and casting defects of the die-cast aluminum alloy samples under different vacuum conditions, effectively improving the evaluation accuracy and evaluation efficiency of the cast aluminum alloy performance, and can significantly reduce the overall evaluation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings:

[0018] Figure 1 A schematic front view of a movable mold provided by one embodiment of the present invention;

[0019] Figure 2 A three-dimensional diagram of a movable mold provided by one embodiment of the present invention;

[0020] Figure 3 A schematic structural diagram of a gate runner provided in one embodiment of the present invention;

[0021] Figure 4 A schematic diagram of material processing and sample preparation for testing provided by one embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the test sample size provided in one embodiment of the present invention.

[0023] Reference numerals in the figures:

[0024] 1. Mold frame; 2. Mold core; 3. Diverter cone; 4. Main runner; 5. Thin-walled runner; 6. Medium-walled runner; 7. Thick-walled runner; 8. Thermal crack island; 9. Exhaust runner; 10. Vacuum guide groove; 11. Vacuum valve; 12. Exhaust deceleration groove; 13. Straight edge near gate; 14. Straight edge far from gate; 15. Oil line connector. DETAILED DESCRIPTION

[0025] The following further describes specific embodiments of the present invention with reference to the accompanying drawings. Like components are denoted by like reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively.

[0026] In the present invention, unless otherwise specified or limited, the term "fixed" and the like should be understood in a broad sense. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; and can mean internal communication between two elements or an interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] It should be noted that in the prior art, evaluating the comprehensive performance of new cast aluminum alloy materials using large-scale die-casting machines and large molds is prohibitively expensive due to the high costs of manufacturing equipment, mold manufacturing, and trial production of parts for large, one-piece die-castings. Relevant data shows that the cost of trial-producing a large, one-piece die-casting using a new aluminum alloy is 1 million yuan per trial. However, a single trial production is far from sufficient to accumulate empirical data for actual production. Furthermore, due to the lengthy filling process for large, one-piece die-castings, the microstructure and degree of defects at different locations on the part exhibit significant variability, resulting in poor consistency in the mechanical properties of the parts, which are closely related to vehicle safety. Establishing a correspondence between macroscopic mechanical properties and microstructure and degree of defects, thereby more accurately guiding part structural design to achieve cast parts that meet vehicle safety requirements, is crucial. Therefore, for the development and application of such materials, new molds with low cost, high efficiency, and high applicability are needed for comprehensive material performance evaluation. The current ordinary casting aluminum alloy molds have problems such as single evaluation function and inability to prepare samples with different microstructures and defect levels. Therefore, there is a need for a multifunctional casting aluminum alloy performance comprehensive evaluation mold that can establish the correspondence between macroscopic mechanical properties, microstructures and casting defects.

[0028] That is to say, the production cost of one-piece large-scale die-casting parts in the existing technology is high, and multiple molds are required to meet the testing requirements under various conditions. The design cost of multiple molds is high, the overall evaluation efficiency is low, and the comprehensive performance evaluation of the material needs to be combined with the output of multiple molds. It is difficult to ensure the consistency of the die-cast aluminum alloy samples and the accuracy of the evaluation.

[0029] For this reason, Figure 1 and Figure 2As shown, one embodiment of the present invention provides a mold for evaluating the performance of die-cast aluminum alloys, comprising a movable mold and a static mold. The movable mold body comprises a mold frame 1 and a mold core 2 mounted in the mold frame 1. The combination of the movable mold and the static mold can die-cast liquid aluminum alloy under preset conditions to obtain a die-cast aluminum alloy sample. The die-cast aluminum alloy sample can then be subjected to various tests and machined to prepare samples for metallographic examination, casting defect detection, or mechanical property testing. In other words, the mold of the present invention can achieve comprehensive performance evaluation of die-cast aluminum alloy samples in multiple dimensions using a single mold.

[0030] The mold core 2 is provided with a diverter cone 3 for receiving the liquid aluminum alloy material, a test flow channel for testing the fluidity of the liquid aluminum alloy material, an exhaust flow channel 9 for discharging the gas generated in the test flow channel, and a vacuum mechanism for forming a vacuum state in the test flow channel. The test flow channel is provided with a thermal cracking island 8 for testing the thermal cracking tendency.

[0031] As a preferred embodiment, the mold frame 1 can be made of 45-gauge steel, and the mold core 2 can be made of H13 mold steel. Other materials that meet the mold requirements of the present invention can also be used. The static mold body is provided with a cavity corresponding to the test flow channel structure, which is used to form the shape of the test flow channel during the casting process of the liquid aluminum alloy material.

[0032] Among them, the movable mold body is integrated with a steel mold core 2 and a mold frame 1 for forming a casting cavity. The mold core 2 is provided with a diverter cone 3 and a test flow channel. The diverter cone 3 is used to receive the liquid aluminum alloy material poured from the outside. Combined with the hollow structure of the test flow channel, it can guide the molten aluminum alloy and other liquid aluminum alloy materials to evenly fill the cavity in the test flow channel, and set a thermal cracking island 8 at an appropriate position on the test flow channel to artificially increase the shrinkage stress point of the liquid aluminum alloy material in the thermal cracking island 8 during solidification, so as to test the thermal cracking tendency of the liquid aluminum alloy material at the same time. An exhaust structure such as an exhaust flow channel 9 can also be provided on the movable mold to discharge the gas generated when the liquid aluminum alloy material flows and solidifies in the test flow channel. By providing a vacuum mechanism connected to the exhaust flow channel 9, the cavity in the test flow channel can be vacuumed. The vacuuming process can be a complete vacuum or a specific vacuum degree to obtain die-cast aluminum alloy samples formed in the test flow channel under various vacuum conditions. At the same time, an exhaust deceleration groove 12 can be provided at the front end of the exhaust flow channel 9 to accommodate a large amount of liquid aluminum alloy material flowing out of the test flow channel, or to slow the flow rate of the liquid aluminum alloy material to optimize the exhaust process and exhaust safety. Through this structural design, the mold can effectively simulate various conditions throughout the casting process and produce corresponding die-cast aluminum alloy samples, ensuring that the die-cast aluminum alloy samples can meet the comprehensive evaluation requirements for the process performance of large-scale, one-piece die-cast aluminum alloy parts used in vehicle manufacturing.

[0033] In summary, the mold for evaluating the performance of die-cast aluminum alloys provided in an embodiment of the present invention tests the fluidity of the liquid aluminum alloy material by setting a test flow channel, and then uses a vacuum mechanism to enable the test flow channel to form die-cast aluminum alloy samples in a vacuum state and a non-vacuum state respectively. The die-cast aluminum alloy samples of the target shape can be cut out from the test flow channel for testing to detect the mechanical properties, microstructure and casting defects of the die-cast aluminum alloy samples, and the thermal cracking tendency is also tested by setting a thermal cracking island 8 on the test flow channel.

[0034] The main innovation of the present invention is that it can realize multi-dimensional performance evaluation of one-piece large-scale die-cast aluminum alloy materials in the same mold, and can simultaneously test the fluidity, solidification characteristics, microstructure, casting defects and static properties of the aluminum alloy. It can also realize selective vacuum treatment through the vacuum mechanism, and can compare the performance differences of die-cast aluminum alloy samples formed under vacuum conditions and non-vacuum conditions, thereby establishing a correspondence between the mechanical properties and microstructure and casting defects of die-cast aluminum alloy samples under different vacuum conditions, effectively improving the evaluation accuracy and efficiency of the cast aluminum alloy performance, and can significantly reduce the overall evaluation cost.

[0035] In one embodiment, the test runner includes a main runner 4 connected to the diversion cone 3 and several parallel branch runners connected to the main runner 4, the near gate of the branch runner is connected to the main runner 4, and the far gate of the branch runner is connected to the exhaust runner 9, and the cross-sectional area of each branch runner is different.

[0036] Furthermore, the branch runner has multiple bends, and the branch runner winds from the inside to the outside in a direction from the near gate to the far gate, and the thermal cracking island 8 is arranged at the bend of the branch runner.

[0037] Furthermore, the sub-runner includes a plurality of straight edges with a rectangular cross section and hollowed out internally, and thermal cracking islands 8 with cylindrical thick-wall structures connected to the straight edges are provided between the straight edges.

[0038] Furthermore, the runners include at least a thin-wall runner 5, a medium-wall runner 6 and a thick-wall runner 7, the cross-sections of which have increasing thicknesses, for simulating the solidification behavior of liquid aluminum alloy materials under different forming thickness conditions.

[0039] In the present embodiment, the test runner includes a main runner 4 and at least a plurality of branch runners with a rectangular cross-section of a U-shaped shape of different thicknesses. One end of the main runner 4 is connected to the diversion cone 3, and one end is respectively connected to the inlet of the branch runner to guide the liquid aluminum alloy material into each branch runner. The multiple branch runners are arranged in a closed ring shape, each branch runner is concentric and the sides are parallel, and the total flow length is long to ensure that the molten metal has a sufficient flow path when passing through the sample. Since the samples formed by each branch runner have different wall thicknesses, these branch runners can respectively simulate the flow conditions of the liquid aluminum alloy material under different wall thickness conditions, thereby evaluating the fluidity of the aluminum alloy material. This design is particularly suitable for testing the flow properties of aluminum alloy materials used for large die-cast parts with long filling distances and various wall thicknesses.

[0040] Each straight edge of each branch runner is provided with a thermal cracking island 8 having a cylindrical thick-wall structure. The provision of the thermal cracking island 8 allows local stress concentration to occur at the bend of the branch runner during solidification shrinkage, thereby increasing the probability of thermal cracking. The provision of the thermal cracking island 8 having a cylindrical thick-wall structure makes it easier for the liquid aluminum alloy material to thermally crack in the portion die-casted by the thermal cracking island 8, thereby allowing the thermal cracking tendency of the die-cast aluminum alloy sample to be evaluated after forming. The thermal cracking island 8, combined with the provision of the branch runner, simulates and detects the fluidity and thermal cracking tendency of the aluminum alloy material during a single die-casting process in the same mold.

[0041] Furthermore, each branch runner has multiple straight edges, each of which is a rectangular hollow tube or hollow groove structure. These straight edges are connected by thermal crack islands 8 to form the branch runner. Die-cast aluminum alloy samples of varying thickness formed within these straight edges can be machined to obtain the desired test specimens. For example, small specimens can be cut from the die-cast aluminum alloy samples for metallographic observation, casting defect detection, and mechanical property testing such as tensile testing. Microstructural analysis and mechanical property testing can also be performed on the resulting samples to comprehensively evaluate the internal structure and performance indicators of the die-cast aluminum alloy samples under different conditions.

[0042] like Figure 3As shown, in this embodiment, the straight edge of the area near the gate is positioned as the near-gate straight edge 13, and the straight edge of the area near the far gate is defined as the far-gate straight edge 14. The die-cast aluminum alloy samples formed in the near-gate straight edge 13 and the far-gate straight edge 14 are tested separately, and then the liquid aluminum alloy material in each branch runner is die-cast under vacuum and normal pressure to form die-cast aluminum alloy samples in various combinations. They are then tested for their structure and performance, and the corresponding relationship between the structural defects and mechanical properties of the aluminum alloy material under different solidification conditions can be established. Specifically, the die-cast aluminum alloy samples in the near-gate straight edge 13 tend to experience a shorter flow distance and faster cooling, while the die-cast aluminum alloy samples in the far-gate straight edge 14 have a longer flow path and cooling time. Comparative analysis of the die-cast aluminum alloy samples in these two straight edges in the branch runner is helpful to study the influence of die-casting process conditions on the material structure and mechanical properties of the die-cast aluminum alloy.

[0043] In one embodiment, the vacuum mechanism includes a vacuum guide groove 10 and a vacuum valve 11. The vacuum guide groove 10 is connected to the exhaust flow channel 9 through the vacuum valve 11. The vacuum guide groove 10 and the vacuum valve 11 are used to extract the air in the test flow channel to form a vacuum state.

[0044] Furthermore, an exhaust deceleration groove 12 is provided between the end of the test flow channel and the exhaust flow channel 9 , and the exhaust deceleration groove 12 is used to slow down the flow rate of the liquid aluminum alloy material to prevent the liquid aluminum alloy material from entering the exhaust flow channel 9 .

[0045] Furthermore, the exhaust flow channel 9 passes through the static mold body and is in communication with the external environment to discharge the gas generated during the flow or solidification process of the liquid aluminum alloy material.

[0046] In this embodiment, a complete vacuum mechanism and exhaust mechanism are provided in the mold for evaluating the performance of die-cast aluminum alloy. Specifically, a vacuum guide groove 10 is provided between the dynamic mold body and the static mold body and is equipped with a vacuum valve 11. The vacuum valve 11 can be connected to the test flow channel through an external vacuum pump and is used to perform vacuum treatment on the test flow channel during the solidification process of the liquid aluminum alloy material. In addition, the exhaust deceleration groove 12 between the exhaust flow channel 9 and the end of the test flow channel can accommodate and slow down the liquid aluminum alloy, so that the gas of the liquid aluminum alloy is fully discharged, thereby cooperating with the vacuum guide groove 10 to optimize the exhaust path, and the gas in various parts of the mold can be evenly discharged during the vacuum mechanism's vacuuming process.

[0047] In one embodiment, a plurality of oil circuits are provided on the movable die body, and a plurality of pairs of oil circuit connectors 15 are provided on both sides of the movable die body. The oil circuit connectors 15 are used to connect to an external vacuum system and / or hydraulic system.

[0048] In this embodiment, four cooling oil circuits are installed within the movable mold body, two on each side, to regulate its temperature. Correspondingly, four pairs of oil connectors 15 are located on the outer surfaces of both sides of the movable mold body for connecting to external cooling system piping. These cooling channels and connectors enable independent temperature control and uniform cooling on both sides of the mold, ensuring a constant casting temperature for the aluminum alloy during the pouring process and improving the consistency of casting quality.

[0049] In summary, the method for evaluating the performance of aluminum alloys using the mold of the present invention is as follows: first, the cooling system and the vacuum system are started, and the liquid aluminum alloy is injected into the mold from the diverter cone 3. The liquid aluminum alloy fills the entire cavity of the sample in the test channel through the main channel 4 and the branch runner, and solidifies under the action of the exhaust system and the vacuum system. After solidification is completed, the clamping mechanism of the movable mold body is opened, and the die-cast aluminum alloy sample and the sample are taken out together. Then, the rectangular straight edge part of the sample is cut and processed into a sample to be tested in the required shape, and the cylindrical structure formed by the thermal cracking island 8 is subjected to thermal cracking detection. Finally, these test samples are processed accordingly and then subjected to metallographic structure analysis, casting defect detection and tensile testing, so as to obtain the performance data of the material under different conditions. By comparing the test results of multiple groups of samples such as near the gate and far gate, vacuum casting and normal pressure casting, the correlation between the microstructure, defect degree and mechanical properties of the aluminum alloy material can be established.

[0050] like Figure 3 As shown, the length of the shortest straight side and the thickness of the thinnest straight side of the runner can be limited. As a preference, the length of the shortest straight side L min The thickness of the thinnest straight edge is 100mm. min The total length of the branch runner can be further limited to 10mm, and the shortest total length of the branch runner is greater than 2000mm, thereby ensuring that the formed die-cast aluminum alloy sample meets the evaluation requirements.

[0051] like Figure 4 and Figure 5 As shown, in the processing of red lotus, the die-cast aluminum alloy sample can also be tensile tested as one of the preferred tensile test specimens. The processed tensile test specimen includes a test clamping end, an arc transition area, and a test parallel section. o =25mm, L c =32mm, L t=100mm, b=10mm, a0 is the original thickness of the rectangular straight edge, S0 is the cross-sectional area of the parallel section of the tensile specimen, the material fluidity in the casting processability is examined by the fluidity specimen, the fluidity specimen includes three thicknesses of straight edges and a thermal cracking island 8, the feed end of the fluidity specimen is connected to the runner, and the discharge end is connected to the exhaust deceleration groove 12 and the exhaust flow channel 9, the thermal cracking island 8 is a cylindrical structure, and the thickness is 4 times the thickness a0 of the corresponding rectangular cross-section straight edge. The cracking condition of the thermal cracking island 8 structure and the surrounding area can examine the thermal cracking tendency in the casting processability of the material.

[0052] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0053] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other variations can be made based on the principles of the present invention, which should also be considered as the scope of protection of the present invention.

Claims

1. A mold for evaluating the performance of die-cast aluminum alloy, characterized in that: It comprises a movable mold and a static mold, wherein the movable mold body comprises a mold frame (1) and a mold core (2) installed in the mold frame (1); The mold core (2) is provided with a diverter cone (3) for receiving liquid aluminum alloy material, a test flow channel for testing the fluidity of the liquid aluminum alloy material, an exhaust flow channel (9) for discharging gas generated in the test flow channel, and a vacuum mechanism for forming a vacuum state in the test flow channel, which are connected in sequence. The test flow channel is provided with a thermal cracking island (8) for testing the thermal cracking tendency.

2. The mold for evaluating the performance of die-cast aluminum alloy according to claim 1, characterized in that: The test runner comprises a main runner (4) connected to the diverter cone (3) and a plurality of parallel branch runners connected to the main runner (4), the near gate of the branch runner is connected to the main runner (4), and the far gate of the branch runner is connected to the exhaust runner (9), and the cross-sectional areas of the branch runners are different.

3. The mold for evaluating the performance of die-cast aluminum alloy according to claim 2, characterized in that: The branch runner has multiple bends, and the branch runner winds from the inside to the outside in the direction from the near gate to the far gate, and the thermal cracking island (8) is arranged at the bend of the branch runner.

4. The mold for evaluating the performance of die-cast aluminum alloy according to claim 3, characterized in that: The branch runner comprises a plurality of straight edges with a rectangular cross section and hollowed out internally, and thermal cracking islands (8) with cylindrical thick-wall structures connected to the straight edges are provided between the straight edges.

5. The die for evaluating the performance of die-cast aluminum alloy according to claim 4, characterized in that: The branch runners at least include a thin-walled branch runner (5), a medium-walled branch runner (6), and a thick-walled branch runner (7) with successively increasing cross-sectional thicknesses, and are used to simulate the solidification behavior of liquid aluminum alloy materials under conditions of different forming thicknesses.

6. The mold for evaluating the performance of die-cast aluminum alloy according to claim 1, characterized in that: The vacuum mechanism comprises a vacuum guide groove (10) and a vacuum valve (11); the vacuum guide groove (10) is connected to the exhaust flow channel (9) via the vacuum valve (11); the vacuum guide groove (10) and the vacuum valve (11) are used to extract air from the test flow channel to form a vacuum state.

7. The die for evaluating the performance of die-cast aluminum alloy according to claim 1, characterized in that: An exhaust deceleration groove (12) is provided between the end of the test flow channel and the exhaust flow channel (9), and the exhaust deceleration groove (12) is used to slow down the flow rate of the liquid aluminum alloy material to prevent the liquid aluminum alloy material from entering the exhaust flow channel (9).

8. The mold for evaluating the performance of die-cast aluminum alloy according to claim 1, characterized in that: The exhaust flow channel (9) passes through the static mold body and is in communication with the external environment to discharge the gas generated during the flow or solidification process of the liquid aluminum alloy material.

9. The mold for evaluating the performance of die-cast aluminum alloy according to claim 1, characterized in that: The static mold body is provided with a cavity corresponding to the test flow channel structure, which is used to form the shape of the test flow channel during the casting process of the liquid aluminum alloy material.

10. The mold for evaluating the performance of die-cast aluminum alloy according to any one of claims 1 to 9, characterized in that: The movable die body is provided with a plurality of oil circuits, and a plurality of pairs of oil circuit connectors (15) are respectively provided on both sides of the movable die body. The oil circuit connectors (15) are used to connect to an external vacuum system and / or hydraulic system.

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