Casting mold for testing mold interface temperature, mold interface temperature testing method and casting process parameter determining method

Abstract

The invention discloses a casting mold, a mold interface temperature testing method and a casting process parameter determining method. The casting mold comprises a mold body and a temperature measuring structure, and the temperature measuring structure comprises a temperature measuring hole formed in the mold body, a temperature measuring element and a positioning block arranged in the temperature measuring hole; the temperature measuring hole is a blind hole, and the bottom area of the blind hole forms a temperature measuring target area; one end part of the temperature measuring element is a temperature measuring end, a positioning hole is formed in the positioning block, the temperature measuring element is arranged in the positioning hole in a penetrating manner, and the temperature measuring end extends out of the positioning block and extends into a temperature measuring target area; the temperature measuring structures are arranged at intervals in the first direction, the extending direction of each temperature measuring element is perpendicular to the first direction, the temperature measuring ends of the temperature measuring elements in the temperature measuring structures are located on the same straight line extending in the first direction, and the first direction is perpendicular to the interface of the mold to be measured. According to the casting mold, the temperature measuring element can be accurately positioned, and the temperature values at the same position of the mold interface and different distances away from the mold interface can be obtained in the one-time casting process.

Description

Technical Field

[0001] The present invention relates to the field of casting technology, and particularly to a casting mold for testing the interface temperature of a mold, a method for testing the interface temperature of the mold, and a method for determining casting process parameters. Background Art

[0002] As a molding technology with a long history, casting technology occupies an important position in the manufacturing industry. Traditional casting technologies generally have problems such as poor quality of castings and high rejection rates, which are mainly closely related to the low level of casting technology. The production of castings mostly adopts the trial-and-error method. For the development of large castings or new products, repeated trials are often required, which not only results in a long cycle and large waste, but also makes it difficult to guarantee the product quality.

[0003] With the development of modern technologies, especially the increasing maturity of computer technologies, numerical simulation technology is gradually becoming the main tool for the design and optimization of hot working processes such as casting and heat treatment. Accurate and complete material thermophysical parameters are the necessary known conditions for numerical simulation. In particular, the interfacial heat transfer coefficient between the casting and the mold directly affects the reliability of the simulation results. However, the casting process is a complex phase change heat transfer process. The liquid metal gradually solidifies in the mold as the temperature decreases, and shrinkage occurs during the solidification process of the casting. These complex factors not only make it difficult to obtain the interfacial heat transfer coefficient through theoretical analysis methods, but also make it difficult for current experimental means to measure the interface temperature without distorting the temperature field at the interface. Therefore, the research on interfacial heat transfer in the casting process belongs to a typical inverse heat conduction problem. For such inverse problems, the temperature fields in the melt and the mold are usually obtained through experimental means, and then the boundary conditions of the object are solved by the inverse calculation method to obtain the interfacial heat transfer coefficient between the casting and the mold. Therefore, it is of great significance to accurately measure the temperatures at multiple characteristic points in the mold for calculating the interfacial heat transfer coefficient between the casting and the mold.

[0004] In the prior art, in the actual operation of testing the temperature field inside the mold, it is very difficult to accurately position the temperature measuring end of the thermocouple, which makes it difficult to guarantee the reliability of the temperature measurement results. Summary of the Invention

[0005] The main technical problem to be solved by the present invention is to provide a casting mold with a simple structure and capable of accurately testing the interface temperature of the mold.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A casting mold for testing the interface temperature of a mold, including a mold body, the casting mold further includes a temperature measuring structure for testing the temperature inside the mold body, and the temperature measuring structure includes:

[0008] A temperature measurement hole is provided in the mold body. The temperature measurement hole is a blind hole, and a temperature measurement target area is formed in the bottom area of the blind hole;

[0009] A temperature measurement element, one end is a temperature measurement end, and the other end is used to connect to a data acquisition system located outside the mold body;

[0010] A positioning block is provided in the temperature measurement hole and is matched with the temperature measurement hole. There is a gap between one end face of the positioning block facing the temperature measurement target area and the bottom surface of the temperature measurement hole. A positioning hole matched with the temperature measurement element is provided on the positioning block. The temperature measurement element is inserted into the positioning hole, and the temperature measurement end extends outside the positioning block and extends into the temperature measurement target area;

[0011] A plurality of the temperature measurement structures are arranged at intervals in the first direction. In each of the temperature measurement structures, the extending direction of the temperature measurement element is perpendicular to the first direction. The temperature measurement ends of the temperature measurement elements in the plurality of temperature measurement structures are located on the same straight line extending in the first direction, and the first direction is perpendicular to the interface of the mold to be measured.

[0012] In some embodiments, the gap forms a filler space. The temperature measurement structure further includes a filler filled in the filler space and capable of conducting electricity. In the normal temperature state, the filler is liquid, and the viscosity of the filler is 1 mPa·s to 40000 mPa·s. The temperature measurement end extends into the filler space, and the filler fills the gap between the temperature measurement end and the temperature measurement target area.

[0013] In some embodiments, the temperature measurement end is located in the lower part of the filler space in the filler space.

[0014] In some embodiments, the filler is one of gallium, gallium-indium alloy, gallium-indium-tin alloy, and gallium-indium-tin-zinc alloy.

[0015] In some embodiments, the temperature measurement structure further includes a limiting structure for limiting the position of the positioning block in the temperature measurement hole.

[0016] In some embodiments, the limiting structure is provided on one of the mold body and the positioning block and is in abutting cooperation with the other of them.

[0017] In some embodiments, the temperature measuring hole includes a first hole and a second hole arranged in sequence, the cross-sectional size of the first hole is smaller than the cross-sectional size of the second hole, the limiting structure is an end face of the first hole arranged toward the second hole, the positioning block is arranged in the second hole, an end face of the positioning block facing the temperature measurement target area is abutted against an end face of the first hole arranged toward the second hole, and the temperature measuring end of the temperature measuring element is located in the first hole.

[0018] In some embodiments, the temperature measuring hole is a straight hole, the limiting structure is a limiting step protruding outward from the outer surface of the positioning block, the limiting step is located outside the mold body, and the limiting step faces one end surface of the mold body and is abutted against the mold body.

[0019] In some embodiments, the temperature measuring end is disposed against the bottom surface of the temperature measuring hole.

[0020] In some embodiments, the diameter of the temperature measuring element is no greater than 1 mm.

[0021] In some embodiments, the material of the positioning block is the same as that of the mold body.

[0022] The present invention also provides a method for testing the mold interface temperature, using the casting mold as described in any one of the above items to test the mold interface temperature, the testing method comprising:

[0023] S1, inserting the temperature measuring elements into the positioning holes of the positioning blocks one by one, and making the temperature measuring ends extend to a set length outside the positioning blocks;

[0024] S2, installing each of the positioning blocks in the temperature measuring holes in a one-to-one correspondence, and extending the temperature measuring end into the temperature measuring target area of ​​each of the temperature measuring holes;

[0025] S3, performing casting, during the entire casting stage, the temperature values ​​of various parts inside the mold body changing with time are tested by the temperature measuring elements;

[0026] S4, according to the test data of each temperature measuring element, the temperature value of the mold body at different distances from the mold interface to be tested at each moment is fitted by curve fitting;

[0027] S5, using the fitting curve obtained in step S4 to inversely calculate the temperature value of the interface of the mold to be measured at each moment;

[0028] S6, plotting a temperature curve of the mold interface to be tested that changes with time during the entire casting stage.

[0029] In some embodiments, before the positioning block is inserted into the temperature measurement hole, a conductive filler is introduced into the temperature measurement hole. When the positioning block is inserted into a set position in the temperature measurement hole, the filler fills the filler space formed between one end face of the positioning block facing the temperature measurement target area and the bottom surface of the temperature measurement hole.

[0030] The present invention also provides a method for determining casting process parameters, using the casting mold described in any one of the above or the mold interface temperature measurement method to measure the temperature of the mold interface to be measured.

[0031] Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art: In the casting mold for measuring the temperature of the mold interface of the present invention, each temperature measurement structure is arranged at intervals in a direction perpendicular to the mold interface to be measured, and the temperature measurement ends of each temperature measurement element are located on the same straight line extending in a direction perpendicular to the mold interface to be measured. In this way, the temperature values at different distances from the mold interface to be measured at the same position of the mold interface to be measured can be obtained in one casting process. At the same time, the influence of the position deviation of each measurement point on the test result can be avoided, and the positioning effect of the casting mold on the temperature measurement element during the test is good, so that the temperature measurement accuracy can be improved, and the temperature value of the mold interface to be measured can be obtained more accurately. In addition, the casting mold has a simple structure, is convenient for disassembly, replacement and reuse, and can reduce the casting cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Attached Figure 1 is a three-dimensional schematic diagram of the casting mold for measuring the temperature of the mold interface in this embodiment;

[0033] Attached Figure 2 is a front view schematic diagram of the casting mold for measuring the temperature of the mold interface in this embodiment;

[0034] Attached Figure 3 is the attached Figure 2 partial enlarged schematic diagram at A in the attached;

[0035] Attached Figure 4 is the attached Figure 2 cross-sectional schematic diagram along the line A-A in the attached;

[0036] Attached Figure 5 is the attached Figure 2 cross-sectional schematic diagram along the line B-B in the attached;

[0037] Attached Figure 6 is the attached Figure 5 partial enlarged schematic diagram at A in the attached;

[0038] Attached Figure 7 is a schematic diagram of the structure of another embodiment;

[0039] Attached Figure 8Schematic diagram of the fitting curve of the temperature values at different distances from the mold interface in the mold body at a certain moment of fitting.

[0040] Wherein: 1. Mold body; 11. Fixed mold; 111. Cavity; 112. Temperature measurement hole; 1121. First hole; 1122. Second hole; 12. Movable mold; 2. Positioning block; 21. Positioning hole; 3. Temperature measurement element; 31. Temperature measurement end; 4. Data acquisition system; 5. Filler; 6. Limit step. Specific implementation mode

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. For example, Figure 2 in the figure, the left side direction in the figure is "left", the right side direction is "right", the upper side direction is "upper", the lower side direction is "lower", and the direction perpendicular to the paper surface in the figure is "front" and "rear". This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] When determining the casting process parameters through numerical simulation, it is necessary to obtain the heat transfer coefficient at the casting / mold interface. The heat transfer coefficient is calculated from the casting temperature and the mold interface temperature. Since the mold interface is in direct contact with the melt and cannot be directly measured by a temperature measurement element, the casting mold of this embodiment can be used to measure the mold interface temperature. To avoid waste, the casting mold of this embodiment can also be used for the production of actual castings.

[0044] As Figures 1 to 7 shown, the casting mold for measuring the mold interface temperature of the present invention includes a mold body 1 and a temperature measurement structure disposed in the mold body 1.

[0045] The mold body 1 includes a fixed mold 11 and a movable mold 12. The fixed mold 11 has a cavity 111 for forming a casting. The temperature measurement structure is disposed on the fixed mold 11 to detect the temperature in the fixed mold 11 during the entire casting cycle stage, so as to determine the temperature of the mold interface A to be measured.

[0046] The temperature measurement structure includes a temperature measurement hole 112, a positioning block 2, a temperature measurement element 3, and a data acquisition system 4.

[0047] The temperature measurement hole 112 is provided in the fixed mold 11. The temperature measurement hole 112 is a blind hole, and the bottom area of the blind hole forms a temperature measurement target area.

[0048] The positioning block 2 is adapted to the temperature measurement hole 112. At least part of the positioning block 2 is arranged in the temperature measurement hole 112, and there is a gap between one end face of the positioning block 2 facing the temperature measurement target area and the bottom surface of the temperature measurement hole 112.

[0049] The positioning block 2 is provided with a positioning hole 21 penetrating through both ends in its length direction, and the positioning hole 21 is adapted to the temperature measurement element 3.

[0050] The temperature measurement element 3 is used to measure the temperature inside the fixed mold 11. One end of the temperature measurement element 3 is a temperature measurement end 31. The temperature measurement element 3 is inserted into the positioning hole 21, and its temperature measurement end 31 extends out of the positioning block 2 by a set length and extends into the temperature measurement target area.

[0051] The data acquisition system 4 is arranged outside the mold body 1. The other end of the temperature measurement element 3 is connected to the data acquisition system 4 to record the temperature detected by the temperature measurement element 3 through the data acquisition system 4.

[0052] Positioning the temperature measurement element 3 through the positioning block 2 can reduce the position deviation of the temperature measurement element 3 in the temperature measurement hole 112. Moreover, by controlling the length of the temperature measurement end 31 extending out of the positioning block 2, it can be ensured that the temperature measurement end 31 extends into the temperature measurement target area of the temperature measurement hole 112, thereby improving the accuracy and reliability of the temperature measurement result. In addition, since the temperature measurement hole 112 is a blind hole, it can also avoid the problem that the melt leaks out and contacts the temperature measurement end 31 of the temperature measurement element 3, thus affecting the test accuracy.

[0053] Along the first direction E, a plurality of temperature measurement structures are arranged at intervals. The extending direction of the temperature measurement element 3 in each temperature measurement structure is perpendicular to the first direction E. In this way, during the entire casting cycle stage, the temperature values changing with time at different distances from the interface A of the mold to be measured can be measured. In this embodiment, the first direction E is the left-right direction, and the first direction E is perpendicular to the interface A of the mold to be measured.

[0054] The temperature measurement ends 31 of the temperature measurement elements 3 in the plurality of temperature measurement structures are located on the same straight line extending along the first direction E. In this way, the projections of the respective temperature measurement positions at different distances on the interface A of the mold to be measured are located at the same position on the interface A of the mold to be measured. In this way, in the other two directions perpendicular to the first direction E, that is, Figure 2In the up-down direction and the front-back direction, the distances from each temperature measurement position to the upper side, lower side, front side, and rear side of the fixed mold 11 are the same, thereby avoiding the influence on the test results due to the up-down or front-back position deviation of each temperature measurement position. Moreover, in one casting process of the present invention, the temperature values at the same position of the interface A of the mold to be measured and at different distances from the interface A of the mold to be measured can be obtained, so as to avoid the influence on the test results caused by the inability to make the casting process parameters completely consistent each time. This makes the accuracy of the temperature values measured at each temperature measurement position higher, and thus the temperature value at the corresponding position of the interface A of the mold to be measured can be obtained more accurately.

[0055] Preferably, the temperature measurement end 31 of each temperature measurement element 3 abuts against the bottom surface of the temperature measurement hole 112 to ensure the accuracy of the temperature measurement position, thereby improving the temperature measurement accuracy.

[0056] The positioning block 2 and the fixed mold 11 are made of the same material, so that the positioning block 2 and the fixed mold 11 have the same temperature field, thereby improving the temperature measurement accuracy.

[0057] Each temperature measurement element 3 is connected to the same data acquisition system 4, making the overall structure simple and facilitating the overall processing of data.

[0058] In this embodiment, the diameter of the temperature measurement element 3 is not greater than 1 mm. The thinner diameter of the temperature measurement element 3 makes the sensitivity higher and the response speed faster during the temperature measurement process. Moreover, within a certain size range, the number and density of the temperature measurement points can be increased, thereby improving the temperature measurement accuracy.

[0059] The temperature measurement element 3 can be a thermocouple.

[0060] Each temperature measurement structure further includes a conductive filler 5. The interval between the end face of the positioning block 2 facing the temperature measurement target area and the bottom surface of the temperature measurement hole 112 forms a filler space, and the filler 5 is filled in this filler space. At least during the casting process, the filler 5 is in a liquid state. In this way, when the temperature measurement end 31 does not extend into the temperature measurement target area of the temperature measurement hole 112 and there is a gap between the temperature measurement end 31 and the temperature measurement target area, the liquid filler 5 can tightly fill this gap, thereby avoiding the influence of the gap on the temperature measurement result and improving the temperature measurement accuracy.

[0061] In this embodiment, the filler 5 is in a liquid state at normal temperature, and the viscosity of the filler 5 is 1 mPa·s to 40000 mPa·s, and the order of magnitude of the thermal conductivity is 10 2W / m·K. In this way, when the mold starts to be preheated and the local temperature of the mold is relatively low, the filler 5 can fill the gap between the temperature measuring end 31 and the temperature measuring target area, so as to realize the accurate measurement of the mold temperature in the whole process of casting. Moreover, since the filler 5 is in a liquid state at normal temperature and there is no phase change during the whole casting process, the temperature of the mold body 1 will not be reduced due to heat absorption during phase change, thus affecting the true temperature of the mold body 1 and further affecting the measurement accuracy.

[0062] Specifically, the filler 5 can be selected from one of gallium, gallium-indium alloy, gallium-indium-tin alloy and gallium-indium-tin-zinc alloy.

[0063] The volume of the filler 5 is equal to or slightly smaller than the volume of the filler space to ensure that the filler 5 can tightly fill the gap between the temperature measuring end 31 and the temperature measuring target area.

[0064] Preferably, the temperature measuring end 31 of the temperature measuring element 3 is located at the lower part of the filler space. Under the action of gravity, the filler 5 is fully filled in the lower part of the filler space. In this way, even when the volume of the filler 5 is smaller than the volume of the filler space, it can be ensured that the filler 5 can tightly fill the gap between the temperature measuring end 31 and the temperature measuring target area, thus avoiding the influence of the gap on the temperature measurement result.

[0065] In this embodiment, the positioning block 2 is in a long strip shape, and the temperature measuring element 3 is located at the lower part of the positioning block 2 on the positioning block 2, so that the temperature measuring end 31 of the temperature measuring element 3 is also located at the lower part of the filler space.

[0066] Each temperature measuring structure further includes a limiting structure, which limits the position of the positioning block 2 in the temperature measuring hole 112, so that after the positioning block 2 is installed in the temperature measuring hole 112, the temperature measuring end 31 of the temperature measuring element 3 can extend into the temperature measuring target area of the temperature measuring hole 112.

[0067] The limiting structure is provided on one of the fixed mold 11 and the positioning block 2 and is in abutting cooperation with the other one of them.

[0068] Specifically, in one embodiment, the temperature measuring hole 112 includes a first hole 1121 and a second hole 1122 arranged in sequence. The cross-sectional dimension of the first hole 1121 is smaller than that of the second hole 1122, that is, the temperature measuring hole 112 is a stepped hole. The positioning block 2 is adapted to the second hole 1122 and is arranged in the second hole 1122. The cross-sectional dimension of the positioning block 2 is larger than that of the first hole 1121. The limiting structure is the end face of the first hole 1121 facing the second hole 1122. The end face of the positioning block 2 facing the temperature measuring target area abuts against the end face of the first hole 1121 facing the second hole 1122, and the temperature measuring end 31 of the temperature measuring element 3 is located in the first hole 1121. In this embodiment, the accommodating space formed by the first hole 1121 is the filler space. AsFigure 5 and Figure 6 shown.

[0069] In another embodiment, the temperature measuring hole 112 is a straight hole, and the limiting structure is a limiting step 6 protruding outward from the outer surface of the positioning block 2. The limiting step 6 is located outside the fixed mold 11, and one end surface of the limiting step 6 facing the fixed mold 11 is abutted against the outer surface of the fixed mold 11. Figure 7 shown.

[0070] The method for testing the mold interface temperature by using the casting mold specifically comprises the following steps:

[0071] (1) The temperature measuring elements 3 are inserted into the positioning holes 21 of the positioning blocks 2 one by one, and the temperature measuring ends 31 are extended to a set length outside the positioning blocks 2. In this embodiment, the length of the temperature measuring ends 31 extending to the outside of the positioning blocks 2 is the same as the length of the first hole 1121 along the axial direction.

[0072] (2) Filler 5 is introduced into the temperature measuring hole 112, and the volume of the filler 5 introduced is equal to the volume of the filler space, or slightly smaller than the volume of the filler space.

[0073] (3) Insert each positioning block 2 into each temperature measuring hole 112 one by one until the positioning block 2 moves to the position limited by the limiting structure for the positioning block 2. At this time, the temperature measuring end 31 of the temperature measuring element 3 extends into the temperature measuring target area of ​​each temperature measuring hole 112.

[0074] When the positioning block 2 is inserted into the temperature measuring hole 112 , the filler 5 is pushed to move toward the filler space. After the positioning block 2 is installed in place, the filler 5 is filled in the filler space and fills the gap between the temperature measuring end 31 and the temperature measuring target area.

[0075] (4) The mold is preheated for a certain period of time and casting begins. During the entire process, the temperature values ​​of various positions inside the fixed mold 11 that change with time are tested by the temperature measuring elements 3.

[0076] (5) The test data of each temperature measuring element 3 is collected by the data acquisition system 4, and the temperature values ​​at different distances from the interface A of the mold to be tested in the fixed mold 11 at each moment are fitted by curve fitting. The schematic diagram of the fitting curve at a certain moment is as follows: Figure 8 shown.

[0077] (6) Using the fitting curve obtained in step (5), the temperature value of the mold interface A to be measured at each moment is obtained by reverse calculation.

[0078] (7) Draw the temperature curve of the mold interface A to be tested changing with time during the entire casting stage.

[0079] After obtaining the temperature value of the interface A of the mold to be measured changing with time using the present invention and then obtaining the temperature value of the melt changing with time during the casting process, the heat transfer coefficient at the casting / mold interface can be calculated, so that the casting process can be numerically simulated, and then the casting process parameters for casting the casting product can be determined to improve the quality of the casting product.

[0080] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A casting mold for testing the mold interface temperature, comprising a mold body, characterized in that: The casting mold also includes a temperature measuring structure for testing the internal temperature of the mold body, and the temperature measuring structure includes: A temperature measuring hole is arranged in the mold body, the temperature measuring hole is a blind hole, and the bottom area of ​​the blind hole forms a temperature measuring target area; A temperature measuring element, one end of which is a temperature measuring end, and the other end of which is used to connect to a data acquisition system located outside the mold body; A positioning block is arranged in the temperature measuring hole and matched with the temperature measuring hole, a gap is formed between an end surface of the positioning block facing the temperature measuring target area and a bottom surface of the temperature measuring hole, a positioning hole matched with the temperature measuring element is arranged on the positioning block, the temperature measuring element is inserted into the positioning hole, and the temperature measuring end extends to the outside of the positioning block and extends into the temperature measuring target area; There are multiple temperature measuring structures arranged at intervals along the first direction, the extension direction of the temperature measuring element in each of the temperature measuring structures is perpendicular to the first direction, the temperature measuring ends of each of the temperature measuring elements in the multiple temperature measuring structures are located on the same straight line extending along the first direction, and the first direction is perpendicular to the interface of the mold to be measured.

2. The casting mold for testing the mold interface temperature according to claim 1, characterized in that: The interval forms a filling space, and the temperature measurement structure also includes a filler filled in the filling space and capable of conducting electricity. At normal temperature, the filler is liquid, and the viscosity of the filler is 1mPa·s to 40000mPa·s. The temperature measurement end extends into the filling space, and the filler is filled in the gap between the temperature measurement end and the temperature measurement target area.

3. The casting mold for testing the mold interface temperature according to claim 2, characterized in that: The temperature measuring end is located in the lower part of the packing space in the packing space.

4. The casting mold for testing the mold interface temperature according to claim 2, characterized in that: The filler is one of gallium, gallium-indium alloy, gallium-indium-tin alloy and gallium-indium-tin-zinc alloy.

5. The casting mold for testing the mold interface temperature according to claim 1, characterized in that: The temperature measuring structure also includes a limiting structure for limiting the position of the positioning block in the temperature measuring hole.

6. The casting mold for testing the mold interface temperature according to claim 5, characterized in that: The limiting structure is arranged on one of the mold body and the positioning block, and is matched with the other one of the two.

7. The casting mold for testing the mold interface temperature according to claim 6, characterized in that: The temperature measuring hole includes a first hole and a second hole arranged in sequence, the cross-sectional size of the first hole is smaller than the cross-sectional size of the second hole, the limiting structure is an end face of the first hole arranged toward the second hole, the positioning block is arranged in the second hole, an end face of the positioning block facing the temperature measurement target area is abutted against an end face of the first hole arranged toward the second hole, and the temperature measuring end of the temperature measuring element is located in the first hole.

8. The casting mold for testing the mold interface temperature according to claim 6, characterized in that: The temperature measuring hole is a straight hole, the limiting structure is a limiting step protruding outward from the outer surface of the positioning block, the limiting step is located outside the mold body, and the limiting step faces one end surface of the mold body and is abutted against the mold body.

9. The casting mold for testing the mold interface temperature according to claim 1, characterized in that: The temperature measuring end is disposed against the bottom surface of the temperature measuring hole.

10. The casting mold for testing the mold interface temperature according to claim 1, characterized in that: The diameter of the temperature measuring element is not greater than 1 mm.

11. The casting mold for testing the mold interface temperature according to claim 1, characterized in that: The material of the positioning block is the same as that of the mold body.

12. A mold interface temperature testing method, characterized in that: The casting mold according to any one of claims 1 to 11 is used to test the mold interface temperature, and the testing method comprises: S1, inserting the temperature measuring elements into the positioning holes of the positioning blocks one by one, and making the temperature measuring ends extend to a set length outside the positioning blocks; S2, installing each of the positioning blocks in the temperature measuring holes in a one-to-one correspondence, and extending the temperature measuring end into the temperature measuring target area of ​​each of the temperature measuring holes; S3, performing casting, during the entire casting stage, the temperature values ​​of various parts inside the mold body changing with time are tested by the temperature measuring elements; S4, according to the test data of each temperature measuring element, the temperature value of the mold body at different distances from the mold interface to be tested at each moment is fitted by curve fitting; S5, using the fitting curve obtained in step S4 to inversely calculate the temperature value of the interface of the mold to be measured at each moment; S6, plotting a temperature curve of the mold interface to be tested that changes with time during the entire casting stage.

13. The method for testing the mold interface temperature according to claim 12, characterized in that: Before the positioning block is inserted into the temperature measuring hole, a conductive filler is introduced into the temperature measuring hole. When the positioning block is inserted into a set position in the temperature measuring hole, the filler is filled in a filler space formed between an end surface of the positioning block facing the temperature measurement target area and the bottom surface of the temperature measuring hole.

14. A method for determining casting process parameters, characterized in that: The temperature of the mold interface to be tested is tested using the casting mold according to any one of claims 1 to 11 or the mold interface temperature testing method according to claim 12 or 13.

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