CN114487337A - Test piece for verifying die casting manufacturability and test method of die casting material - Google Patents
Test piece for verifying die casting manufacturability and test method of die casting material Download PDFInfo
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- CN114487337A CN114487337A CN202210096191.0A CN202210096191A CN114487337A CN 114487337 A CN114487337 A CN 114487337A CN 202210096191 A CN202210096191 A CN 202210096191A CN 114487337 A CN114487337 A CN 114487337A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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Abstract
The present disclosure relates to a test piece and a die-casting material test method for verifying die-casting manufacturability, the test piece having a plurality of straight portions and a plurality of curved portions, the plurality of straight portions being arranged in parallel, both ends of the plurality of curved portions being connected to ends of the two straight portions, respectively, the plurality of straight portions and the curved portions being connected and extending in a first direction, the straight portions and the curved portions each including a plurality of splines adjacently arranged in a second direction, the plurality of splines having different thicknesses, wherein the first direction and the second direction are perpendicular to each other. The design of the multi-section straight line part and the multi-section bending part can simulate the casting forming process of an ultra-long flow, realize the verification of the early casting manufacturability of large die castings, realize enough flowing length, ensure the minimum sizes of a die and a die casting machine and reduce the development cost; in addition, the performance of the splines with different thicknesses at the same position can be verified simultaneously, the accuracy of the verification result is improved, and comparison and analysis are facilitated.
Description
Technical Field
The disclosure relates to the technical field of testing of die-casting materials, in particular to a test piece for verifying die-casting manufacturability and a test method of the die-casting materials.
Background
The ultra-large high-pressure casting can be produced in one piece by adopting a giant die casting machine, the number of parts is reduced, the surface of the casting is very neat, additional bolts, rivets, welding seams and the like cannot be seen, and the ultra-large high-pressure casting has the advantages of high integration level, large effective load, light weight and the like and can be applied to the processing of large thin-wall shell structures such as automobile body parts and the like. When an ultra-large high-pressure casting is formed, due to the characteristics of large flow length, short filling time, high condensation speed, large filling difficulty and the like, when the manufacturability of a die-casting material is verified, the flow performance, the mechanical performance, the microstructure performance and the like of the die-casting piece can be simulated through a sample piece, however, for the sample piece with an ultra-long flow, a huge die and a die-casting machine need to be designed in a matched mode, the development cost is increased, and a whole set of test method is not available in the prior art.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides a test piece and a test method of a die-casting material for verifying a die-casting manufacturability.
According to a first aspect of the embodiments of the present disclosure, there is provided a sample piece for verifying die-casting manufacturability, the sample piece having a plurality of straight portions and a plurality of curved portions, the plurality of straight portions being arranged in parallel, both ends of the plurality of curved portions being connected to end portions of two of the straight portions, respectively, the plurality of straight portions and curved portions being connected and extending in a first direction, the straight portions and curved portions each including a plurality of splines adjacently arranged in a second direction, the splines having different thicknesses, wherein the first direction and the second direction are perpendicular to each other.
Optionally, a plurality of the splines are the same size in the second direction; and/or the presence of a gas in the gas,
the thicknesses of the splines are sequentially increased or decreased along the second direction.
Optionally, the distances between the plurality of mutually parallel straight portions are equal, the plurality of curved portions have a semicircular structure with the same curvature radius, and the size of the sample piece in the first direction is at least 3 m.
Alternatively, the sample piece has two free ends, one of which is a starting point and the other of which is an ending point, and sampling points are provided at the same position at a predetermined distance from the starting point, the sampling points being located on a plurality of splines of the straight line portion.
Optionally, the sampling points are arranged along the first direction at equal intervals and are respectively arranged on the multiple straight line portions.
According to a second aspect of the embodiments of the present disclosure, there is provided a method for testing a die-casting material, the die-casting material being made into the above-mentioned sample piece for testing, the method comprising:
sampling at the same position which is a predetermined distance away from the starting point of the sample piece, wherein the position is positioned on the straight line part, and a first sample piece and a second sample piece with the same size are cut on the same sample strip of the straight line part;
testing mechanical properties, namely performing unidirectional tensile test on the first sample wafer to obtain a macroscopic mechanical property index of the first sample wafer; and
and performing metallographic detection, namely performing metallographic detection on the second sample to obtain a microstructure index of the second sample, and comparing the microstructure index with the macroscopic mechanical property index.
Optionally, the sampling step further comprises cutting a plurality of first sample pieces of the same size on the same spline of the straight line part;
in the mechanical property testing step, the plurality of first sample sheets are subjected to unidirectional tensile testing respectively, and the obtained macroscopic mechanical property indexes are averaged.
Optionally, the assay method further comprises:
and (5) detecting by a scanning electron microscope, carrying out fracture analysis on the first sample sheet subjected to the unidirectional tensile test fracture, and determining the defect type.
Optionally, the sampling step further includes cutting a third sample piece of the same size on the same spline of the straight line part; the assay method further comprises:
and (4) testing the riveting performance, namely performing self-riveting test on the third sample wafer, and recording the cracking condition of the third sample wafer.
Optionally, the assay method further comprises:
and respectively intercepting the first sample wafer and the second sample wafer with the same size on different sample strips at the same position, and carrying out corresponding tests.
Optionally, the assay method further comprises:
and cutting the first sample wafer and the second sample wafer with the same size at a plurality of positions which are arranged at equal intervals along the first direction, and carrying out corresponding tests.
Optionally, the macro-mechanical property indicator comprises at least one of yield strength, tensile strength, elongation.
Optionally, the sampling step is performed under the following parameter settings, the filling time of the die casting material is 0.1-0.15s, the temperature of the die is heated to 50-200 ℃, the vacuum degree of the die casting machine is 60-100bar, and multiple times of sampling are performed.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: in the sample piece provided by the disclosure, the design of the multi-section straight line part and the multi-section bending part can simulate the casting forming process of an ultra-long flow, the verification of the early casting manufacturability of a large die casting is realized, the sufficient flowing length can be realized, the minimum sizes of a die and a die casting machine can be ensured, and the development cost is reduced; in addition, the performance of the splines with different thicknesses at the same position can be verified simultaneously, the accuracy of the verification result is improved, and comparison and analysis are facilitated.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic diagram illustrating a sample part for verifying die-casting manufacturability according to an exemplary embodiment.
FIG. 2 is a cross-sectional view of a coupon for verifying die casting manufacturability in accordance with an exemplary embodiment.
FIG. 3 is a schematic diagram illustrating a sample part for verifying die casting manufacturability in accordance with an exemplary embodiment.
FIG. 4 is a schematic diagram illustrating a sample part for verifying die casting manufacturability in accordance with an exemplary embodiment.
Fig. 5-9 are flow diagrams illustrating a sample method of die casting a material according to various exemplary embodiments.
Description of the reference numerals
11-straight, 12-curved, 100-spline, 101-first swatch, 102-second swatch, 103-third swatch.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
As shown in fig. 1 and 2, the present disclosure provides a sample piece for verifying die-casting manufacturability, which has a multi-segment straight portion 11 and a multi-segment bent portion 12, the multi-segment straight portion 11 being arranged in parallel, both ends of the multi-segment bent portion 12 being connected to ends of the two straight portions 11, respectively, the multi-segment straight portion 11 and the bent portion 12 being connected and extending in a first direction, the straight portion 11 and the bent portion 12 each including a plurality of splines 100 adjacently arranged in a second direction, the plurality of splines 100 having different thicknesses, wherein the first direction and the second direction are perpendicular to each other. Here, the "first direction" is a casting direction at the time of molding of the sample piece, the point a may be a starting point corresponding to a casting gate, the point B may be an end point of casting, that is, a length direction of the sample piece, and the "second direction" is a width direction of the sample piece, that is, a section in the second direction in fig. 2, and it can be seen from the drawing that the sample piece may have three sample strips each having a width of 42mm, and the thicknesses of the three sample strips 100 are 3mm, 4mm, and 5mm, respectively. In other embodiments, the number of splines 100, and the specific dimensions in the width and thickness directions, are not specifically limited by the present disclosure. In addition, the sample piece provided by the disclosure can be a heat-treatment-free high-pressure cast aluminum material, and can be applied to the fields of automobile body hardware, battery pack thin-wall shells and the like.
Through the technical scheme, in the sample piece provided by the disclosure, the design of the multi-section straight line part 11 and the multi-section bending part 12 can simulate the casting forming process of an ultra-long flow, the early casting manufacturability verification of a large die casting is realized, the sufficient flowing length can be realized, the minimum sizes of a die and a die casting machine can be ensured, and the development cost is reduced; in addition, the performance of the splines 100 with different thicknesses at the same position can be verified simultaneously, the accuracy of the verification result is improved, and comparison and analysis are facilitated.
Specifically, in the present disclosure, the plurality of splines 100 may have the same size in the second direction, for example, as shown in fig. 2, the widths of all three splines 100 are 42mm, and of course, the splines may be designed to have different widths, which may be realized by designing a mold; with respect to the thicknesses of the splines 100, as shown in fig. 2, the thicknesses of the splines 100 may sequentially increase or decrease along the second direction, and in other embodiments, may be designed to have any suitable thickness.
In the present disclosure, distances between the plurality of linear portions 11 parallel to each other may be equal, the plurality of bent portions 12 may have a semicircular structure having the same radius of curvature, and a size of the sample piece in the first direction may be at least 3 m. In the present embodiment, the distance between the two parallel straight portions 11 may be 197mm, the curvature radius of the curved portion 12 may be 100mm, and the total length of the sample piece may be 3000mm, and in other embodiments, the shape of the curved portion 12 and the specific turning angle may be designed to simulate the flow behavior of the die-cast material after flowing through the turning radius, so as to sufficiently verify the flow filling property of the large-sized high die-cast thin-walled material.
As shown in fig. 1, the sample piece has two free ends, one of which is a starting point a and the other of which is an end point B, and sample points are provided at the same position at a predetermined distance from the starting point a, the sample points being located on a plurality of splines 100 of the straight portion 11. For example, performance tests can be performed on samples of 40mm by 100mm (where 40mm refers to the dimension along the second direction and 100mm refers to the dimension along the first direction) taken over three splines 100, respectively, from C1-C1 to D1-D1, which are 1000mm from the a point, to verify the performance of the samples at the same location of different thicknesses, and to explore and analyze the effect of the thickness of the samples on the performance. Here, it may be that the distance from C1-C1 to point A is 1000mm, or the distance from the midpoint between C1-C1 and D1-D1 to point A is 1000mm, and the above sampling method is also applicable to the range from C2-C2 to D2-D2, and the range from C3-C3 to D3-D3, which can be regarded as being located at approximately the same position.
Further, the sampling points may be plural and arranged at equal intervals in the first direction and respectively provided on the multi-segment straight line portion 11. That is, performance tests were performed on 40mm by 100mm coupons taken at a distance of 1000mm from point a in the range of C1-C1 to D1-D1, at a distance of 2000mm from point a in the range of C2-C2 to D2-D2, and at a distance of 3000mm from point a in the range of C3-C3 to D3-D3, respectively, to explore the flow behavior and performance of die casting materials of different thicknesses after the same flow turn radius. In other embodiments, the size of each swatch may be calculated and designed based on the size of the spline 100 and the number of swatches that need to be cut.
According to another aspect of the present disclosure, there is also provided a test method of a die casting material, in which the die casting material is made into the above-described sample piece for testing, which has all the advantages of the above-described sample piece, and not described herein too much, as shown in fig. 3 and 5, the test method of the present disclosure includes:
a step 501 of sampling at the same position at a predetermined distance from the starting point of the sample piece, the position being located on the straight line portion, and the first sample 101 and the second sample 102 having the same size are cut out from the same spline of the straight line portion, for example, the first sample 101 and the second sample 102 having the same size can be cut out from the range of C1-C1 to D1-D1 having a distance of 1000mm from the a point;
and 503, performing metallographic detection, namely performing metallographic detection on the second sample wafer 102 to obtain a microstructure index of the second sample wafer 102, and comparing the microstructure index with a macroscopic mechanical property index.
The test method provided by the disclosure can be used for respectively carrying out mechanical property test and metallographic phase detection on two sample wafers 101 and 102 which are located at the same position and have the same thickness after flowing through the same turning radius so as to observe macroscopic mechanical property expression and microscopic tissue expression, can ensure the accuracy of a test structure, can explain macroscopic property through the microstructure, is convenient to analyze, and is suitable for test verification of large-scale heat-free high-pressure casting materials through analysis verification from different dimensions.
In the sample method provided by the present disclosure, the sampling step 501 further includes cutting out a plurality of first sample wafers 101 of the same size from the same spline 100 of the straight line portion, that is, assuming that the length of the straight line portion is 500mm, three first sample wafers 101 of 100mm in length, one second sample wafer 102 of 100mm in length, and one third sample wafer 103 of 100mm in length, which will be mentioned below, may be cut out, and in the mechanical property testing step 502, the plurality of first sample wafers 101 are respectively subjected to a unidirectional tensile test, and the obtained macro mechanical property indexes are averaged to improve the accuracy of the mechanical property testing result.
As shown in fig. 6, the assay methods provided by the present disclosure further include: and step 604, detecting by a scanning electron microscope, performing fracture analysis on the first sample wafer 101 subjected to the unidirectional tensile test fracture, performing stress analysis on the fracture with mechanical fluctuation, and determining the defect type.
As shown in fig. 4 and 7, in the testing method provided by the present disclosure, the sampling step further includes, step 7011, cutting the third sample piece 103 of the same size on the same spline of the straight portion, that is, cutting the first sample piece 101, the second sample piece 102, and the third sample piece 103 of the same size in the range of C1-C1 to D1-D1, which are 1000mm from the a point; the assay methods provided by the present disclosure further comprise: step 705, riveting test, which is to perform self-riveting test on the third sample wafer 103 and record the cracking condition of the third sample wafer 103. The method is characterized in that the sample wafers in the same batch and position as the tensile sample wafer and the metallographic detection sample wafer are selected for self-piercing riveting test, so that the influence of unnecessary variables on the test result is reduced, and the accuracy of the test result is ensured. When the material test of the ultra-large high-pressure casting is carried out, all test data are obtained according to the test method, data analysis is carried out, the material components can be determined after the properties of the material in different aspects are comprehensively considered, and appropriate process parameters are worked out. The test method provided by the disclosure fully considers the complete and comprehensive detection of the shape, the size, the casting process parameters, the material detection, the mechanical property detection, the riveting property test and the like of the sample wafer, is suitable for the early-stage material verification of the ultra-large casting and ensures the performance of the final machined casting.
As shown in fig. 8, the assay methods provided by the present disclosure further comprise: and step 802, respectively intercepting the first sample wafer 101 and the second sample wafer 102 with the same size on different sample strips at the same position, and performing corresponding tests. Therefore, the mechanical property test in the step 803 and the metallographic detection in the step 804 can be carried out on the sample wafers with different thicknesses at the same position so as to explore the influence of the thickness on the performance of the sample wafers. Of course, it is also possible to cut out the third sample 103 with the same size and perform the riveting test, and the scope of the present disclosure is also included.
As shown in fig. 9, the assay methods provided by the present disclosure further comprise: and step 902, cutting the first sample wafer 101 and the second sample wafer 102 with the same size at a plurality of positions which are arranged at equal intervals along the first direction, and performing corresponding tests. Like this, can carry out step 903 mechanical properties test and step 904 metallographic phase to the sample of different positions department, same thickness or different thickness and detect to explore the influence of flowing distance to sample performance, of course, can also intercept the third sample 103 of the same size, carry out the riveting nature test, also belong to this disclosed protection range.
In the testing method provided by the present disclosure, the macro-mechanical property index may include at least one of yield strength, tensile strength, and elongation, and different property indexes are comprehensively considered to determine the optimal process parameters.
In the method, the sampling step is carried out under the following parameter settings, the filling time of the die-casting material is 0.1-0.15s, the temperature of the die is heated to 50-200 ℃, the vacuum degree of the die-casting machine is 60-100bar, and the sampling is carried out for multiple times, at least 3 groups can be selected for testing under the parameter conditions, and the test structures of a plurality of groups of sample wafers represent the final test result in an average value mode.
In conclusion, in the test method provided by the disclosure, the aspects of the casting manufacturability, the material components, the material performance, the connectivity test, the different manufacturability of different regions, the different manufacturability of different thicknesses of the same region, the different riveting performance and the like of the material with an ultra-long flow of up to 3m are fully considered, a whole set of performance test method for the die-casting material is provided, the accuracy of the test result can be ensured, and the method can be applied to the processing of large-scale heat-treatment-free high-pressure cast thin-wall parts to obtain the die-casting parts with the optimal performance.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (13)
1. A sample piece for verifying die-casting manufacturability, characterized in that the sample piece has a plurality of straight portions (11) and a plurality of curved portions (12), the plurality of straight portions (11) are arranged in parallel, both ends of the plurality of curved portions (12) are connected to the ends of two straight portions (11), respectively, the plurality of straight portions (11) and curved portions (12) are connected and extend in a first direction, the straight portions (11) and curved portions (12) each include a plurality of splines (100) adjacently arranged in a second direction, the splines (100) have different thicknesses, and wherein the first direction and the second direction are perpendicular to each other.
2. The test piece for verifying die-casting manufacturability according to claim 1,
a plurality of the splines (100) are equal in size in the second direction; and/or the presence of a gas in the gas,
the thicknesses of the splines (100) are sequentially increased or decreased along the second direction.
3. The sample piece for verifying die-casting manufacturability according to claim 1, wherein the distances between the plurality of sections of the straight portion (11) parallel to each other are equal, the plurality of sections of the bent portion (12) are of a semicircular structure having the same radius of curvature, and the size of the sample piece in the first direction is at least 3 m.
4. The sample piece for verifying die-casting manufacturability according to any one of claims 1 to 3, wherein the sample piece has two free ends, one of which is a starting point (A) and the other of which is an ending point (B), and sample points are provided at the same position at a predetermined distance from the starting point (A), the sample points being located on a plurality of splines (100) of the straight portion (11).
5. The sample piece for verifying die-casting manufacturability according to claim 4, wherein said sampling points are plural and arranged at equal intervals in said first direction and provided on said multi-segment straight line portion (11), respectively.
6. A test method of a die-cast material, characterized in that the die-cast material is made into a sample piece according to any one of claims 1 to 5 for testing, the test method comprising:
sampling at the same position at a predetermined distance from the starting point of the sample piece, the position being located on the straight line portion, and cutting out a first sample piece and a second sample piece having the same size from the same sample piece of the straight line portion;
testing mechanical properties, namely performing unidirectional tensile test on the first sample wafer to obtain a macroscopic mechanical property index of the first sample wafer; and
and performing metallographic detection, namely performing metallographic detection on the second sample to obtain a microstructure index of the second sample, and comparing the microstructure index with the macroscopic mechanical property index.
7. The method for testing die casting material according to claim 6, wherein the sampling step further comprises cutting a plurality of first sample pieces of the same size on the same sample piece of the straight portion;
in the mechanical property testing step, the plurality of first sample sheets are subjected to unidirectional tensile testing respectively, and the obtained macroscopic mechanical property indexes are averaged.
8. The method for testing a die-cast material according to claim 6, further comprising:
and (5) detecting by a scanning electron microscope, carrying out fracture analysis on the first sample sheet subjected to the unidirectional tensile test fracture, and determining the defect type.
9. The method for testing a die-casting material according to claim 6,
the sampling step further comprises the step of cutting a third sample piece with the same size on the same sample strip of the straight line part; the assay method further comprises:
and (4) testing the riveting performance, namely performing self-riveting test on the third sample wafer, and recording the cracking condition of the third sample wafer.
10. The assay of any one of claims 6-9, further comprising:
and respectively intercepting the first sample wafer and the second sample wafer with the same size on different sample strips at the same position, and carrying out corresponding tests.
11. The assay of any one of claims 6-9, further comprising:
and cutting the first sample wafer and the second sample wafer with the same size at a plurality of positions which are arranged at equal intervals along the first direction, and carrying out corresponding tests.
12. The testing method of claim 6, wherein the macro-mechanical property indicators comprise at least one of yield strength, tensile strength, elongation.
13. The test method according to claim 6, wherein the sampling step is performed under the following parameter settings, the filling time of the die casting material is 0.1-0.15s, the mold temperature is heated to 50-200 ℃, the vacuum degree of the die casting machine is 60-100bar, and the sampling is performed for a plurality of times.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210096191.0A CN114487337B (en) | 2022-01-26 | 2022-01-26 | Test piece for verifying die casting manufacturability and test method of die casting material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210096191.0A CN114487337B (en) | 2022-01-26 | 2022-01-26 | Test piece for verifying die casting manufacturability and test method of die casting material |
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| CN114487337A true CN114487337A (en) | 2022-05-13 |
| CN114487337B CN114487337B (en) | 2022-12-09 |
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| CN202210096191.0A Active CN114487337B (en) | 2022-01-26 | 2022-01-26 | Test piece for verifying die casting manufacturability and test method of die casting material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116738740A (en) * | 2023-06-20 | 2023-09-12 | 小米汽车科技有限公司 | Structure optimization method and device for large die casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116738740A (en) * | 2023-06-20 | 2023-09-12 | 小米汽车科技有限公司 | Structure optimization method and device for large die casting |
| CN116738740B (en) * | 2023-06-20 | 2024-04-02 | 小米汽车科技有限公司 | Structure optimization method and device for large die casting |
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| CN114487337B (en) | 2022-12-09 |
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