A method for controlling dimensional deformation of thin-walled aluminum alloy die castings

Abstract

This invention discloses a method for controlling the dimensional deformation of thin-walled aluminum alloy die castings, relating to the field of die casting manufacturing. It addresses the current limitations of scientifically assessing the deformation resistance of thin-walled aluminum alloy die castings and objectively comparing the deformation resistance effects under different raw material ratios. The method involves: manufacturing standard die castings based on standard raw material ratios for thin-walled aluminum alloy die castings; conducting impact resistance tests on the standard die castings to obtain their impact resistance values; manufacturing corresponding improved die castings based on different improved raw material ratios and analyzing the dimensional errors between the improved die castings and the theoretical die castings; analyzing the impact resistance values ​​of the improved die castings and the standard die castings; analyzing the deformation resistance of the improved die castings corresponding to the high impact resistance control group, and constructing an improvement ratio range for the raw material ratios. This invention scientifically assesses the deformation resistance of thin-walled aluminum alloy die castings.

Description

Technical Field

[0001] This invention belongs to the field of aluminum alloy die casting technology, specifically a method for controlling the dimensional deformation of thin-walled aluminum alloy die castings. Background Technology

[0002] Thin-walled aluminum alloy die castings are manufactured using a die casting process. This process involves using a pressure casting machine equipped with a casting mold. Molten copper, zinc, aluminum, or aluminum alloys are poured into the die casting machine's feed inlet, and the machine then casts the aluminum alloy parts to the shape and size specified by the mold. These parts are characterized by their thin walls, complex structure, and high forming precision. They are widely used in aerospace, automotive, 3C electronics, and communication equipment industries where lightweight and high-strength performance are crucial. Die casting is a type of pressure-cast part.

[0003] In actual production, aluminum alloy thin-walled die castings, due to their light and thin structure and small wall thickness, have high requirements for dimensional accuracy and structural stability. They are easily affected by the raw material ratio, resulting in problems such as dimensional deformation, uneven deformation, or substandard mechanical properties. In the existing technology, although the above problems can be alleviated by adjusting the alloy ratio or mold process parameters through experience, it is impossible to achieve a scientific assessment and effective improvement of the deformation resistance of die castings. There is a lack of a testing system for the deformation resistance of thin-walled structures, and it is impossible to objectively compare the deformation resistance effect under different raw material ratios.

[0004] Therefore, this invention proposes a method for controlling the dimensional deformation of thin-walled aluminum alloy die-cast parts. Summary of the Invention

[0005] The purpose of this invention is to provide a method for controlling the dimensional deformation of thin-walled aluminum alloy die-cast parts, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for controlling dimensional deformation of thin-walled aluminum alloy die-cast parts, the method comprising:

[0008] Step S1: Manufacture standard die castings according to the standard raw material ratio for aluminum alloy thin-walled die castings;

[0009] Step S2: Perform an impact resistance test on the standard die casting to obtain the impact resistance value of the standard die casting.

[0010] Step S3: Based on different improved raw material ratios, manufacture corresponding improved die castings and analyze the dimensional errors between the corresponding improved die castings and the theoretical die castings;

[0011] Step S4: Analyze the impact resistance of the improved die casting and the standard die casting based on the impact resistance value of the improved die casting;

[0012] Step S5: Analyze the deformation resistance of the die castings corresponding to the high impact resistance control group, and construct the improvement ratio range of the raw material ratio.

[0013] Further, step S1 includes the following sub-steps:

[0014] Step S11: The die casting mold manufactured according to the geometry and size of the aluminum alloy thin-walled die casting is called the standard die casting mold. The raw material is put into the melting furnace according to the standard raw material ratio of the aluminum alloy thin-walled die casting. The temperature inside the melting furnace is heated to the preset temperature and held for a fixed time. The liquid formed after the raw material is melted is called aluminum liquid.

[0015] Step S12: Preheat the standard die-casting mold to the preheating temperature, spray the release agent onto the surface of the standard die-casting part, and then add molten aluminum into the standard die-casting mold.

[0016] Step S13: After the aluminum hydraulic casting is fixed for a certain time, a standard die casting is obtained. The standard die casting is taken out from the standard die casting mold and allowed to cool naturally to room temperature. The sprue, slag pocket, flash, and peripheral burrs of the standard die casting are removed using an edge trimming device.

[0017] Furthermore, the impact resistance test for standard die castings includes tests on the bending resistance and tensile strength of the standard die castings.

[0018] Further, step S2 includes the following sub-steps:

[0019] Step S21: Perform a bending resistance test on the standard die casting. The bending resistance test specifically includes:

[0020] Step S211: Fix one end of the standard die casting in the fixture and fix the other end of the standard die casting in the pressure equipment;

[0021] Step S212: Apply pressure to the standard die casting using a pressure device. Increase the applied pressure from zero until the angle of the standard die casting changes. Record the applied pressure of the pressure device at the corresponding time and denot it as the yield pressure QF.

[0022] Step S22: Perform tensile property testing on the standard die casting. The tensile property testing specifically includes:

[0023] Step S221: Record the distance between the two ends of the standard die casting as the original length Ly, fix one end of the standard die casting in the fixture, and fix the other end in the tensioning device;

[0024] Step S222: Apply tension to the standard die casting using a tensioning device until the standard die casting breaks. Record the tension applied by the tensioning device when the standard die casting breaks and record it as the maximum tensile force ZD. Align the two broken ends of the standard die casting and measure the length Ld between the two ends of the standard die casting after fracture.

[0025] Step S223: Calculate the elongation after fracture of the standard die casting;

[0026] Step S23: Calculate the impact resistance value of the standard die casting based on the yield pressure and maximum tensile force of the standard die casting.

[0027] Further, step S3 includes the following sub-steps:

[0028] Step S31: Based on the improved raw material ratio of the first control group, repeat steps S11 to S13 to manufacture the improved die casting corresponding to the first control group. Similarly, based on the improved raw material ratio of the second control group, repeat steps S11 to S13 to manufacture the improved die casting corresponding to the second control group.

[0029] Step S32: Measure the wall thickness of the improved die casting corresponding to the first control group multiple times and calculate the average wall thickness. Subtract the theoretical wall thickness of the die casting from the average wall thickness of the improved die casting corresponding to the first control group and take the absolute value to obtain the absolute value of the wall thickness error of the improved die casting corresponding to the first control group.

[0030] Similarly, the absolute value of the wall thickness error of the standard die casting corresponding to the standard group and the absolute value of the wall thickness error of the improved die casting corresponding to the second control group were obtained.

[0031] Step S33: Compare the absolute value of the wall thickness error of the improved die casting corresponding to the first control group with the wall thickness error range;

[0032] If the absolute value of the wall thickness error of the improved die casting corresponding to the first control group is not within the wall thickness error range, the operation is stopped; if the absolute value of the wall thickness error of the improved die casting corresponding to the first control group is within the wall thickness error range, proceed to the next step.

[0033] Similarly, the absolute value of the wall thickness error of the improved die casting corresponding to the second control group was compared with the wall thickness error range;

[0034] If the absolute value of the wall thickness error of the improved die casting corresponding to the second control group is not within the wall thickness error range, the operation is stopped; if the absolute value of the wall thickness error of the improved die casting corresponding to the second control group is within the wall thickness error range, proceed to the next step.

[0035] Furthermore, step S3 also includes the following sub-steps:

[0036] Step S34: Compare the absolute value of the wall thickness error of the standard die casting corresponding to the standard group, the absolute value of the wall thickness error of the improved die casting corresponding to the first control group, and the absolute value of the wall thickness error of the improved die casting corresponding to the second control group. The test group with the smallest absolute value of wall thickness error is recorded as the group with the smallest error and proceeds to the next step.

[0037] Step S35: If the smallest error group is the standard group, no operation is performed;

[0038] If the smallest error group is the first control group, then increase the proportion of silicon in the improved raw material ratio of the first control group and repeat steps S1-S33 until the absolute value of the wall thickness error of the corresponding improved die casting remains unchanged or begins to increase. The proportion of silicon in the corresponding improved raw material ratio is recorded as the size-optimal silicon ratio.

[0039] Similarly, if the group with the smallest error is the second control group, then increase the proportion of iron in the improved raw material ratio of the second control group and repeat steps S1-S33 until the absolute value of the wall thickness error of the corresponding improved die casting remains unchanged or begins to increase. The proportion of silicon in the corresponding improved raw material ratio is recorded as the optimal iron ratio for size.

[0040] Further, step S4 includes the following sub-steps:

[0041] Step S41: Repeat the bending resistance test in step S21 and the tensile resistance test in step S22 for the improved die casting corresponding to the first control group to obtain the yield pressure, maximum tensile force and elongation after fracture of the improved die casting corresponding to the first control group.

[0042] Similarly, the bending resistance test in step S21 and the tensile resistance test in step S22 were repeated for the improved die castings corresponding to the second control group to obtain the yield strength, maximum tensile strength and elongation after fracture of the improved die castings corresponding to the second control group.

[0043] Step S42: Repeat the calculation process of impact resistance value in step S23 to calculate the impact resistance value of the improved die casting corresponding to the first control group and the impact resistance value of the improved die casting corresponding to the second control group.

[0044] Step S43: Compare the impact resistance value of the improved die casting corresponding to the first control group with the impact resistance value of the standard die casting corresponding to the standard group.

[0045] Furthermore, step S4 also includes the following sub-steps:

[0046] Step S44: If the impact resistance value of the improved die casting corresponding to the first control group is less than the impact resistance value of the standard die casting corresponding to the standard group, then stop the operation; if the impact resistance value of the improved die casting corresponding to the first control group is greater than or equal to the impact resistance value of the standard die casting corresponding to the standard group, then proceed to the next step.

[0047] Step S45, similarly, compare the impact resistance value of the improved die casting corresponding to the second control group with the impact resistance value of the standard die casting corresponding to the standard group;

[0048] If the impact resistance value of the improved die casting corresponding to the second control group is less than the impact resistance value of the standard die casting corresponding to the standard group, the operation is stopped; if the impact resistance value of the improved die casting corresponding to the second control group is greater than or equal to the impact resistance value of the standard die casting corresponding to the standard group, the operation proceeds to the next step.

[0049] Step S46: Compare the impact resistance value of the improved die casting corresponding to the first control group with the impact resistance value of the improved die casting corresponding to the second control group, and record the test group with the larger impact resistance value as the strong impact resistance control group.

[0050] Further, step S5 includes the following sub-steps:

[0051] Step S51: Compare the elongation after fracture of the improved die casting corresponding to the high impact resistance control group with the elongation after fracture of another control group.

[0052] If the elongation after fracture of the improved die casting corresponding to the high impact resistance control group is greater than or equal to the elongation after fracture of the improved die casting corresponding to the other control group, it indicates that the deformation resistance of the improved die casting corresponding to the high impact resistance control group is stronger than the deformation resistance of the improved die casting corresponding to the other control group, and then proceed to the next step.

[0053] If the elongation after fracture of the improved die casting corresponding to the high impact resistance control group is less than that of the improved die casting corresponding to the other control group, it indicates that the deformation resistance of the improved die casting corresponding to the other control group is stronger than the deformation resistance of the improved die casting corresponding to the high impact resistance control group, and no operation is performed.

[0054] Step S52: When the strong impact resistance control group is the first control group, the proportion of silicon in the improved raw material ratio of the first control group is increased and steps S1-S2 are repeated until the elongation after fracture of the corresponding improved die casting remains unchanged. The proportion of silicon in the corresponding improved raw material ratio is recorded as the optimal silicon ratio for deformation resistance.

[0055] When the high impact resistance control group is the second control group, the proportion of iron in the improved raw material ratio of the second control group is increased and steps S1-S2 are repeated until the elongation after fracture of the corresponding improved die casting remains unchanged. The proportion of iron in the corresponding improved raw material ratio is recorded as the optimal iron ratio for deformation resistance.

[0056] Furthermore, step S5 also includes the following sub-steps:

[0057] Step S53: Construct an improved silicon ratio range based on the optimal silicon ratio for size and the optimal silicon ratio for deformation resistance; construct an improved iron ratio range based on the optimal iron ratio for size and the optimal iron ratio for deformation resistance, specifically as follows:

[0058] The optimal silicon ratio for size and the optimal silicon ratio for deformation resistance in the corresponding improved raw material ratio are compared. The smaller of the two is taken as the left end of the improved silicon ratio range, and the larger of the two is taken as the right end of the improved silicon ratio range.

[0059] Similarly, the optimal iron ratio for size and the optimal iron ratio for deformation resistance in the corresponding improved raw material ratio are compared. The smaller of the two is taken as the left end of the improved iron ratio range, and the larger of the two is taken as the right end of the improved iron ratio range.

[0060] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0061] 1. This invention manufactures standard die castings based on the standard raw material ratio of aluminum alloy thin-walled die castings, and then conducts impact resistance tests on the standard die castings to obtain the impact resistance value of the standard die castings. This invention scientifically evaluates the deformation resistance of aluminum alloy thin-walled die castings.

[0062] 2. This invention manufactures corresponding improved die castings based on different improved raw material ratios, and analyzes the dimensional errors between the corresponding improved die castings and the theoretical die castings;

[0063] 3. This invention analyzes the impact resistance of improved die castings and standard die castings based on the impact resistance value of improved die castings. At the same time, it analyzes the deformation resistance of improved die castings corresponding to the high impact resistance control group, thereby constructing an improvement ratio range for raw material proportions. This invention can objectively compare the deformation resistance effect of aluminum alloy thin-walled die castings under different raw material proportions. Attached Figure Description

[0064] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0065] Figure 1 This is a flowchart of the method of the present invention;

[0066] Figure 2This is a schematic diagram of the raw material ratio for the standard group in this invention;

[0067] Figure 3 This is a schematic diagram of the raw material ratio for the first control group in this invention;

[0068] Figure 4 This is a schematic diagram of the raw material ratio for the second control group in this invention;

[0069] Figure 5 This is a schematic diagram of the bending resistance test in this invention;

[0070] Figure 6 This is a schematic diagram of the tensile performance test in this invention;

[0071] Figure 7 This is a schematic diagram of the electronic device in this invention. Detailed Implementation

[0072] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] Example 1: Please refer to Figures 1-6 As shown, the technical solution provided by this invention is: a method for controlling the dimensional deformation of thin-walled aluminum alloy die-casting parts, the method being as follows:

[0074] In this embodiment, the aluminum alloy thin-walled die casting is a sheet die casting of uniform thickness. In order to study the influence of raw material ratio on the size of the aluminum alloy thin-walled die casting, three experimental groups were set up, which were denoted as the standard group, the first control group and the second control group, respectively.

[0075] For details, please refer to Figures 2-4 As shown, the standard group with the standard raw material ratio is called the standard group, and the workpiece manufactured according to the standard raw material ratio is the standard die casting. The control group with the silicon ratio in the standard raw material ratio increased by a fixed value is called the first control group. The control group with the iron ratio in the standard raw material ratio increased by a fixed value is called the second control group. The raw material ratio of the first control group and the second control group is called the improved raw material ratio. The workpiece manufactured according to the improved raw material ratio is the improved die casting.

[0076] Step S1: Manufacture standard die castings according to the standard raw material ratio for thin-walled aluminum alloy die castings. The manufacturing process includes the following sub-steps:

[0077] Step S11: The die casting mold manufactured according to the geometry and size of the aluminum alloy thin-walled die casting is called the standard die casting mold. The raw material is put into the melting furnace according to the standard raw material ratio of the aluminum alloy thin-walled die casting. The temperature inside the melting furnace is heated to the preset temperature and held for a fixed time. The liquid formed after the raw material is melted is called aluminum liquid.

[0078] For example, the preset temperature in this embodiment is 600 degrees Celsius, and the heat preservation time is 30 minutes;

[0079] Step S12: Preheat the standard die-casting mold to the preheating temperature, spray the release agent onto the surface of the standard die-casting part, and then add molten aluminum into the standard die-casting mold; in this embodiment, the preheating temperature is 200 degrees Celsius.

[0080] Step S13: After the aluminum is hydraulically cast for a fixed time, a standard die casting is obtained. The standard die casting is then removed from the standard die casting mold and allowed to cool naturally to room temperature. The sprue, slag pocket, flash, and peripheral burrs of the standard die casting are removed using an edge trimming device. The standard die casting is the standard die casting corresponding to the standard group. In this embodiment, the die casting time is 5 seconds.

[0081] Step S2: Perform an impact resistance test on the standard die casting to obtain the impact resistance value of the standard die casting.

[0082] The impact resistance test for standard die castings includes tests on the bending resistance and tensile strength of standard die castings.

[0083] In this embodiment, step S2 includes the following sub-steps:

[0084] Step S21: Perform a bending resistance test on the standard die casting. The bending resistance test specifically includes:

[0085] For step S211, please refer to... Figure 5 As shown, one end of the standard die casting is fixed in the fixture, and the other end of the standard die casting is fixed in the pressure equipment;

[0086] Step S212: Apply pressure to the standard die casting using a pressure device. Increase the applied pressure from zero until the angle of the standard die casting changes. Record the applied pressure of the pressure device at the corresponding time and denot it as the yield pressure QF.

[0087] Step S22: Perform tensile property testing on the standard die casting. The tensile property testing specifically includes:

[0088] For step S221, please refer to... Figure 6 As shown, the distance between the two ends of the standard die casting is denoted as the original length Ly. One end of the standard die casting is fixed in the fixture, and the other end is fixed in the tensioning device.

[0089] Step S222: Apply tension to the standard die casting using a tensioning device until the standard die casting breaks. Record the tension applied by the tensioning device when the standard die casting breaks and record it as the maximum tensile force ZD. Align the two broken ends of the standard die casting and measure the length Ld between the two ends of the standard die casting after fracture.

[0090] Step S223: Calculate the elongation after fracture YS of the standard die casting using the formula YS=(Ld-Ly) / Ly;

[0091] Step S23: Calculate the impact resistance value of the standard die casting based on its yield pressure and maximum tensile strength. Specifically:

[0092] The impact resistance value KB of the standard die casting is calculated using the formula KB=QF×k1+ZD×k2, where k1 and k2 are weighting coefficients, and k1+k2=1; in this embodiment, k1=0.5 and k2=0.5.

[0093] Step S3: Based on different improved raw material ratios, manufacture corresponding improved die castings and analyze the dimensional errors between the corresponding improved die castings and the theoretical die castings;

[0094] Among them, theoretical die castings are ideal die castings designed by manufacturers using computers;

[0095] In this embodiment, step S3 includes the following sub-steps:

[0096] Step S31: Based on the improved raw material ratio of the first control group, repeat steps S11 to S13 to manufacture the improved die casting corresponding to the first control group. Similarly, based on the improved raw material ratio of the second control group, repeat steps S11 to S13 to manufacture the improved die casting corresponding to the second control group.

[0097] Step S32: Measure the wall thickness of the improved die casting corresponding to the first control group multiple times and calculate the average wall thickness. Subtract the theoretical wall thickness of the die casting from the average wall thickness of the improved die casting corresponding to the first control group and take the absolute value to obtain the absolute value of the wall thickness error of the improved die casting corresponding to the first control group.

[0098] Similarly, the absolute value of the wall thickness error of the standard die casting corresponding to the standard group and the absolute value of the wall thickness error of the improved die casting corresponding to the second control group were obtained.

[0099] Step S33: Compare the absolute value of the wall thickness error of the improved die casting corresponding to the first control group with the wall thickness error range;

[0100] If the absolute value of the wall thickness error of the improved die casting corresponding to the first control group is not within the wall thickness error range, the operation is stopped; if the absolute value of the wall thickness error of the improved die casting corresponding to the first control group is within the wall thickness error range, proceed to the next step.

[0101] Similarly, the absolute value of the wall thickness error of the improved die casting corresponding to the second control group was compared with the wall thickness error range;

[0102] If the absolute value of the wall thickness error of the improved die casting corresponding to the second control group is not within the wall thickness error range, then stop the operation; if the absolute value of the wall thickness error of the improved die casting corresponding to the second control group is within the wall thickness error range, then proceed to the next step.

[0103] Step S34: Compare the absolute value of the wall thickness error of the standard die casting corresponding to the standard group, the absolute value of the wall thickness error of the improved die casting corresponding to the first control group, and the absolute value of the wall thickness error of the improved die casting corresponding to the second control group. The test group with the smallest absolute value of wall thickness error is recorded as the group with the smallest error and proceeds to the next step.

[0104] Step S35: If the smallest error group is the standard group, no operation is performed;

[0105] If the smallest error group is the first control group, then increase the proportion of silicon in the improved raw material ratio of the first control group and repeat steps S1-S33 until the absolute value of the wall thickness error of the corresponding improved die casting remains unchanged or begins to increase. The proportion of silicon in the corresponding improved raw material ratio is recorded as the size-optimal silicon ratio.

[0106] Similarly, if the group with the smallest error is the second control group, then increase the proportion of iron in the improved raw material ratio of the second control group and repeat steps S1-S33 until the absolute value of the wall thickness error of the corresponding improved die casting remains unchanged or begins to increase. The proportion of silicon in the corresponding improved raw material ratio is recorded as the optimal iron ratio for size.

[0107] Step S4: Analyze the impact resistance of the improved die casting and the standard die casting based on the improved impact resistance value. The analysis process includes the following sub-steps:

[0108] Step S41: Repeat the bending resistance test in step S21 and the tensile resistance test in step S22 for the improved die casting corresponding to the first control group to obtain the yield pressure, maximum tensile force and elongation after fracture of the improved die casting corresponding to the first control group.

[0109] Similarly, the bending resistance test in step S21 and the tensile resistance test in step S22 were repeated for the improved die castings corresponding to the second control group to obtain the yield strength, maximum tensile strength and elongation after fracture of the improved die castings corresponding to the second control group.

[0110] Step S42: Repeat the calculation process of impact resistance value in step S23 to calculate the impact resistance value of the improved die casting corresponding to the first control group and the impact resistance value of the improved die casting corresponding to the second control group.

[0111] Step S43: Compare the impact resistance value of the improved die casting corresponding to the first control group with the impact resistance value of the standard die casting corresponding to the standard group;

[0112] Step S44: If the impact resistance value of the improved die casting corresponding to the first control group is less than the impact resistance value of the standard die casting corresponding to the standard group, then stop the operation; if the impact resistance value of the improved die casting corresponding to the first control group is greater than or equal to the impact resistance value of the standard die casting corresponding to the standard group, then proceed to the next step.

[0113] Step S45, similarly, compare the impact resistance value of the improved die casting corresponding to the second control group with the impact resistance value of the standard die casting corresponding to the standard group;

[0114] If the impact resistance value of the improved die casting corresponding to the second control group is less than the impact resistance value of the standard die casting corresponding to the standard group, the operation is stopped; if the impact resistance value of the improved die casting corresponding to the second control group is greater than or equal to the impact resistance value of the standard die casting corresponding to the standard group, the operation proceeds to the next step.

[0115] Step S46: Compare the impact resistance value of the improved die casting corresponding to the first control group with the impact resistance value of the improved die casting corresponding to the second control group, and record the test group with the larger impact resistance value as the strong impact resistance control group.

[0116] Step S5 involves analyzing the deformation resistance of the improved die-cast parts corresponding to the high impact resistance control group and constructing the improvement ratio range of the raw material proportions. The analysis includes the following sub-steps:

[0117] Step S51: Compare the elongation after fracture of the improved die casting corresponding to the high impact resistance control group with the elongation after fracture of another control group.

[0118] If the elongation after fracture of the improved die casting corresponding to the high impact resistance control group is greater than or equal to the elongation after fracture of the improved die casting corresponding to the other control group, it indicates that the deformation resistance of the improved die casting corresponding to the high impact resistance control group is stronger than the deformation resistance of the improved die casting corresponding to the other control group, and then proceed to the next step.

[0119] If the elongation after fracture of the improved die casting corresponding to the high impact resistance control group is less than that of the improved die casting corresponding to the other control group, it indicates that the deformation resistance of the improved die casting corresponding to the other control group is stronger than the deformation resistance of the improved die casting corresponding to the high impact resistance control group, and no operation is performed.

[0120] Step S52: When the strong impact resistance control group is the first control group, the proportion of silicon in the improved raw material ratio of the first control group is increased and steps S1-S2 are repeated until the elongation after fracture of the corresponding improved die casting remains unchanged. The proportion of silicon in the corresponding improved raw material ratio is recorded as the optimal silicon ratio for deformation resistance.

[0121] When the strong impact resistance control group is the second control group, the proportion of iron in the improved raw material ratio of the second control group is increased and steps S1-S2 are repeated until the elongation after fracture of the corresponding improved die casting remains unchanged. The proportion of iron in the corresponding improved raw material ratio is recorded as the optimal iron ratio for deformation resistance.

[0122] Step S53: Construct an improved silicon ratio range based on the optimal silicon ratio for size and the optimal silicon ratio for deformation resistance; construct an improved iron ratio range based on the optimal iron ratio for size and the optimal iron ratio for deformation resistance, specifically as follows:

[0123] The optimal silicon ratio for size and the optimal silicon ratio for deformation resistance in the corresponding improved raw material ratio are compared. The smaller of the two is taken as the left end of the improved silicon ratio range, and the larger of the two is taken as the right end of the improved silicon ratio range.

[0124] Similarly, the optimal iron ratio for size and the optimal iron ratio for deformation resistance in the corresponding improved raw material ratio are compared. The smaller of the two is taken as the left end of the improved iron ratio range, and the larger of the two is taken as the right end of the improved iron ratio range.

[0125] In this application, if a corresponding calculation formula appears, the above calculation formula is a dimensionless calculation. The weighting coefficient, proportional coefficient and other coefficients in the formula are set to quantify each parameter to obtain a result value. The size of the weighting coefficient and proportional coefficient is only required to not affect the proportional relationship between the parameter and the result value.

[0126] Example 2: Figure 7 This is a schematic diagram of the structure of an electronic device, which may include: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus. The processor can call logical instructions in the memory to execute a method for controlling the dimensional deformation of aluminum alloy thin-walled die castings, the method including: manufacturing standard die castings according to the standard raw material ratio for aluminum alloy thin-walled die castings;

[0127] Impact resistance tests were conducted on standard die castings to obtain their impact resistance values. Corresponding improved die castings were manufactured based on different improved material ratios, and the dimensional errors between the improved die castings and the theoretical die castings were analyzed. The impact resistance values ​​of the improved die castings were used to analyze the impact resistance of the improved die castings and the standard die castings. The deformation resistance of the improved die castings corresponding to the high impact resistance control group was analyzed, and an improvement ratio range for the material ratios was constructed.

[0128] Furthermore, when the logical instructions in the aforementioned memory can be implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0129] On the other hand, this application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer is able to execute a method for controlling the dimensional deformation of aluminum alloy thin-walled die castings provided by the above methods. The method includes: manufacturing standard die castings according to the standard raw material ratio of aluminum alloy thin-walled die castings.

[0130] Impact resistance tests were conducted on standard die castings to obtain their impact resistance values. Corresponding improved die castings were manufactured based on different improved material ratios, and the dimensional errors between the improved die castings and the theoretical die castings were analyzed. The impact resistance values ​​of the improved die castings were used to analyze the impact resistance of the improved die castings and the standard die castings. The deformation resistance of the improved die castings corresponding to the high impact resistance control group was analyzed, and an improvement ratio range for the material ratios was constructed.

[0131] In another aspect, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the above-mentioned method for controlling the dimensional deformation of a thin-walled aluminum alloy die casting, the method comprising: manufacturing a standard die casting according to a standard raw material ratio for a thin-walled aluminum alloy die casting;

[0132] Impact resistance tests were conducted on standard die castings to obtain their impact resistance values. Corresponding improved die castings were manufactured based on different improved material ratios, and the dimensional errors between the improved die castings and the theoretical die castings were analyzed. The impact resistance values ​​of the improved die castings were used to analyze the impact resistance of the improved die castings and the standard die castings. The deformation resistance of the improved die castings corresponding to the high impact resistance control group was analyzed, and an improvement ratio range for the material ratios was constructed.

[0133] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0134] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for controlling dimensional deformation of thin-walled aluminum alloy die-cast parts, characterized in that, The methods include: Step S1: Manufacture standard die castings according to the standard raw material ratio for thin-walled aluminum alloy die castings; Step S2: Perform an impact resistance test on the standard die casting to obtain the impact resistance value of the standard die casting; the impact resistance test on the standard die casting includes a bending resistance test and a tensile resistance test. Step S3: Based on different improved raw material ratios, manufacture corresponding improved die castings and analyze the dimensional errors between the corresponding improved die castings and the theoretical die castings; Step S4: Analyze the impact resistance of the improved die casting and the standard die casting based on the impact resistance value of the improved die casting; Step S4 includes the following sub-steps: Step S41: Repeat the bending resistance test in step S21 and the tensile resistance test in step S22 for the improved die casting corresponding to the first control group to obtain the yield pressure, maximum tensile force and elongation after fracture of the improved die casting corresponding to the first control group. Similarly, the bending resistance test in step S21 and the tensile resistance test in step S22 were repeated for the improved die castings corresponding to the second control group to obtain the yield strength, maximum tensile strength and elongation after fracture of the improved die castings corresponding to the second control group. Step S42: Repeat the calculation process of impact resistance value in step S23 to calculate the impact resistance value of the improved die casting corresponding to the first control group and the impact resistance value of the improved die casting corresponding to the second control group. Step S43: Compare the impact resistance value of the improved die casting corresponding to the first control group with the impact resistance value of the standard die casting corresponding to the standard group; Step S44: If the impact resistance value of the improved die casting corresponding to the first control group is less than the impact resistance value of the standard die casting corresponding to the standard group, then stop the operation; if the impact resistance value of the improved die casting corresponding to the first control group is greater than or equal to the impact resistance value of the standard die casting corresponding to the standard group, then proceed to the next step. Step S45, similarly, compare the impact resistance value of the improved die casting corresponding to the second control group with the impact resistance value of the standard die casting corresponding to the standard group; If the impact resistance value of the improved die casting corresponding to the second control group is less than the impact resistance value of the standard die casting corresponding to the standard group, the operation is stopped; if the impact resistance value of the improved die casting corresponding to the second control group is greater than or equal to the impact resistance value of the standard die casting corresponding to the standard group, the operation proceeds to the next step. Step S46: Compare the impact resistance value of the improved die casting corresponding to the first control group with the impact resistance value of the improved die casting corresponding to the second control group, and record the test group with the larger impact resistance value as the strong impact resistance control group. Step S5: Analyze the deformation resistance of the improved die castings corresponding to the high impact resistance control group, and construct the improvement ratio range of the raw material ratio. Step S5 includes the following sub-steps: Step S51: Compare the elongation after fracture of the improved die casting corresponding to the high impact resistance control group with the elongation after fracture of another control group. If the elongation after fracture of the improved die casting corresponding to the high impact resistance control group is greater than or equal to the elongation after fracture of the improved die casting corresponding to the other control group, it indicates that the deformation resistance of the improved die casting corresponding to the high impact resistance control group is stronger than the deformation resistance of the improved die casting corresponding to the other control group, and then proceed to the next step. If the elongation after fracture of the improved die casting corresponding to the high impact resistance control group is less than that of the improved die casting corresponding to the other control group, it indicates that the deformation resistance of the improved die casting corresponding to the other control group is stronger than the deformation resistance of the improved die casting corresponding to the high impact resistance control group, and no operation is performed. Step S52: When the strong impact resistance control group is the first control group, the proportion of silicon in the improved raw material ratio of the first control group is increased and steps S1-S2 are repeated until the elongation after fracture of the corresponding improved die casting remains unchanged. The proportion of silicon in the corresponding improved raw material ratio is recorded as the optimal silicon ratio for deformation resistance. When the high impact resistance control group is the second control group, the proportion of iron in the improved raw material ratio of the second control group is increased and steps S1-S2 are repeated until the elongation after fracture of the corresponding improved die casting remains unchanged. The proportion of iron in the corresponding improved raw material ratio is recorded as the optimal iron ratio for deformation resistance.

2. The method for controlling dimensional deformation of thin-walled aluminum alloy die-casting parts according to claim 1, characterized in that, Step S1 includes the following sub-steps: Step S11: The die casting mold manufactured according to the geometry and size of the aluminum alloy thin-walled die casting is called the standard die casting mold. The raw material is put into the melting furnace according to the standard raw material ratio of the aluminum alloy thin-walled die casting. The temperature inside the melting furnace is heated to the preset temperature and held for a fixed time. The liquid formed after the raw material is melted is called aluminum liquid. Step S12: Preheat the standard die-casting mold to the preheating temperature, spray the release agent onto the surface of the standard die-casting part, and then add molten aluminum into the standard die-casting mold. Step S13: After the aluminum hydraulic casting is fixed for a certain time, a standard die casting is obtained. The standard die casting is taken out from the standard die casting mold and allowed to cool naturally to room temperature. The sprue, slag pocket, flash, and peripheral burrs of the standard die casting are removed using an edge trimming device.

3. The method for controlling dimensional deformation of thin-walled aluminum alloy die-casting parts according to claim 1, characterized in that, Step S2 includes the following sub-steps: Step S21: Perform a bending resistance test on the standard die casting. The bending resistance test specifically includes: Step S211: Fix one end of the standard die casting in the fixture and fix the other end of the standard die casting in the pressure equipment; Step S212: Apply pressure to the standard die casting using a pressure device. Increase the applied pressure from zero until the angle of the standard die casting changes. Record the applied pressure of the pressure device at the corresponding time and record it as the yield pressure. Step S22: Perform tensile property testing on the standard die casting. The tensile property testing specifically includes: Step S221: Record the distance between the two ends of the standard die casting as the original length, fix one end of the standard die casting in the fixture, and fix the other end in the tensioning device; Step S222: Apply tension to the standard die casting using a tensioning device until the standard die casting breaks. Record the tension applied by the tensioning device when the standard die casting breaks and record it as the maximum tensile force ZD. Align the two broken ends of the standard die casting and measure the length Ld between the two ends of the standard die casting after fracture. Step S223: Calculate the elongation after fracture of the standard die casting; Step S23: Calculate the impact resistance value of the standard die casting based on the yield pressure and maximum tensile force of the standard die casting.

4. The method for controlling dimensional deformation of thin-walled aluminum alloy die-casting parts according to claim 3, characterized in that, Step S3 includes the following sub-steps: Step S31: Based on the improved raw material ratio of the first control group, repeat steps S11 to S13 to manufacture the improved die casting corresponding to the first control group. Similarly, based on the improved raw material ratio of the second control group, repeat steps S11 to S13 to manufacture the improved die casting corresponding to the second control group. Step S32: Measure the wall thickness of the improved die casting corresponding to the first control group multiple times and calculate the average wall thickness. Subtract the theoretical wall thickness of the die casting from the average wall thickness of the improved die casting corresponding to the first control group and take the absolute value to obtain the absolute value of the wall thickness error of the improved die casting corresponding to the first control group. Similarly, the absolute value of the wall thickness error of the standard die casting corresponding to the standard group and the absolute value of the wall thickness error of the improved die casting corresponding to the second control group were obtained. Step S33: Compare the absolute value of the wall thickness error of the improved die casting corresponding to the first control group with the wall thickness error range; If the absolute value of the wall thickness error of the improved die casting corresponding to the first control group is not within the wall thickness error range, the operation is stopped; if the absolute value of the wall thickness error of the improved die casting corresponding to the first control group is within the wall thickness error range, proceed to the next step. Similarly, the absolute value of the wall thickness error of the improved die casting corresponding to the second control group was compared with the wall thickness error range; If the absolute value of the wall thickness error of the improved die casting corresponding to the second control group is not within the wall thickness error range, the operation is stopped; if the absolute value of the wall thickness error of the improved die casting corresponding to the second control group is within the wall thickness error range, proceed to the next step.

5. The method for controlling dimensional deformation of thin-walled aluminum alloy die-casting parts according to claim 4, characterized in that, Step S3 further includes the following sub-steps: Step S34: Compare the absolute value of the wall thickness error of the standard die casting corresponding to the standard group, the absolute value of the wall thickness error of the improved die casting corresponding to the first control group, and the absolute value of the wall thickness error of the improved die casting corresponding to the second control group. The test group with the smallest absolute value of wall thickness error is recorded as the group with the smallest error and proceeds to the next step. Step S35: If the smallest error group is the standard group, no operation is performed; If the smallest error group is the first control group, then increase the proportion of silicon in the improved raw material ratio of the first control group and repeat steps S1-S33 until the absolute value of the wall thickness error of the corresponding improved die casting remains unchanged or begins to increase. The proportion of silicon in the corresponding improved raw material ratio is recorded as the size-optimal silicon ratio. Similarly, if the group with the smallest error is the second control group, then increase the proportion of iron in the improved raw material ratio of the second control group and repeat steps S1-S33 until the absolute value of the wall thickness error of the corresponding improved die casting remains unchanged or begins to increase. The proportion of silicon in the corresponding improved raw material ratio is recorded as the optimal iron ratio for size.

6. The method for controlling dimensional deformation of thin-walled aluminum alloy die-casting parts according to claim 1, characterized in that, Step S5 further includes the following sub-steps: Step S53: Construct an improved silicon ratio range based on the optimal silicon ratio for size and the optimal silicon ratio for deformation resistance; construct an improved iron ratio range based on the optimal iron ratio for size and the optimal iron ratio for deformation resistance, specifically as follows: The optimal silicon ratio for size and the optimal silicon ratio for deformation resistance in the corresponding improved raw material ratio are compared. The smaller of the two is taken as the left end of the improved silicon ratio range, and the larger of the two is taken as the right end of the improved silicon ratio range. Similarly, the optimal iron ratio for size and the optimal iron ratio for deformation resistance in the corresponding improved raw material ratio are compared. The smaller of the two is taken as the left end of the improved iron ratio range, and the larger of the two is taken as the right end of the improved iron ratio range.

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