CN111855906A - Method and system for collecting shrinkage rate of product - Google Patents
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- CN111855906A CN111855906A CN202010718647.3A CN202010718647A CN111855906A CN 111855906 A CN111855906 A CN 111855906A CN 202010718647 A CN202010718647 A CN 202010718647A CN 111855906 A CN111855906 A CN 111855906A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000015654 memory Effects 0.000 claims description 38
- 238000005259 measurement Methods 0.000 claims description 16
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- 238000012935 Averaging Methods 0.000 claims description 6
- 238000011161 development Methods 0.000 abstract description 10
- 238000012356 Product development Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 182
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
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Abstract
The invention discloses a method and a system for collecting shrinkage rate of a product, wherein the method comprises the following steps: establishing a spatial coordinate system of a product; obtaining the size of a product mold cavity according to a spatial coordinate system of a product; under the preset condition, actually measuring to obtain the actual size of the product; calculating the shrinkage rate of the product by using the size of the cavity of the product mold and the actual size of the product; and collecting and archiving the shrinkage rate of the product according to the preset priority. The shrinkage rate collecting method provided by the invention determines a product shrinkage rate measuring method and collects shrinkage rate data, so that the accuracy of the product mold shrinkage rate is improved, and the product development period and the development cost are reduced.
Description
Technical Field
The invention relates to the technical field of mold shrinkage placement, in particular to a method and a system for collecting product shrinkage.
Background
Before the mold opening design of the mold, shrinkage placement needs to be carried out on the product, and for some products with complex structures and high requirements on dimensional accuracy, the accuracy of the shrinkage placement is particularly important, and the placement of the shrinkage directly influences the development cycle of mold manufacturing and the investment of cost.
In the mold opening process, the product shrinkage rate is placed by selecting one value from range values recommended by a material supplier according to personal experience of a mold designer, and the method has two disadvantages, namely, the recommended value of the material given by the material supplier is determined according to a sample strip mold, a sample strip is often greatly different from an actual product structure, the applicability of the recommended value cannot be judged, and the designer needs to select the recommended range value according to experience, so that the final value is greatly influenced by subjective factors. The unreasonable collection of shrinkage causes the low qualification rate of the die sinking size of the final product, and influences the development progress and the die cost of the product.
Disclosure of Invention
Therefore, the method and the system for collecting the shrinkage rate of the product overcome the defects that in the prior art, due to unreasonable shrinkage rate collection, the yield of the die sinking size of the final product is low, the development time of the product is prolonged, and the cost of the die is increased.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for collecting shrinkage of a product, including:
establishing a spatial coordinate system of a product;
obtaining the size of a product mold cavity according to a spatial coordinate system of a product;
under the preset condition, actually measuring to obtain the actual size of the product;
calculating the shrinkage rate of the product by using the size of the cavity of the product mold and the actual size of the product;
and collecting and archiving the shrinkage rate of the product according to the preset priority.
In one embodiment, the method further comprises: and archiving according to the collected shrinkage of the product according to the performance of the same type of product, wherein the performance of the same type of product comprises the following steps: the usage, structure and size of the product.
In one embodiment, the establishing a spatial coordinate system of the product includes: when a coordinate system of a similar product is established, a space coordinate system of the same standard is adopted.
In one embodiment, the process of establishing a spatial coordinate system of a product includes: the plane with the largest product projection area is taken as a first main plane, the normal vector direction of the first main plane is taken as the direction of a Z axis, the geometric center of the projection of the Z axis and the first main plane is taken as the origin of a coordinate system, the direction with the largest length on the first main plane is taken as the direction of an X axis, and the direction vertical to the XZ plane is determined as the direction of the Y axis.
In one embodiment, the mold cavity dimensions and physical dimensions include: product overall dimensions and critical dimensions that affect product performance.
In an embodiment, the step of actually measuring and acquiring the actual size of the product under the preset condition includes: under the preset condition, measuring the overall dimension of a product and the critical dimension influencing the product performance by utilizing a multiple measurement averaging mode, wherein the preset condition comprises the following steps: the product placement time and the product placement temperature.
In an embodiment, the step of collecting and archiving the shrinkage rate of the product according to the preset priority includes: after the shrinkage of a single product is collected, the product is classified and filed according to the use, material grade, main structure shape, external dimension and key dimension of the product.
In a second aspect, an embodiment of the present invention provides a system for collecting shrinkage rate of a product, including:
the establishment module of the coordinate system, is used for setting up the space coordinate system of the products;
the mould cavity size acquisition module is used for acquiring the size of a product mould cavity according to a space coordinate system of a product;
the actual size acquisition module is used for actually measuring and acquiring the actual size of the product under a preset condition;
the shrinkage calculation module is used for calculating the shrinkage of the product by utilizing the size of the cavity of the product mold and the actual size of the product;
and the shrinkage rate collecting module is used for collecting and archiving the shrinkage rate of the product according to the preset priority level.
In a third aspect, an embodiment of the present invention provides a terminal, including: the device comprises at least one processor and a memory which is in communication connection with the at least one processor, wherein the memory stores instructions which can be executed by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor executes the method for collecting shrinkage rate of products according to the first aspect of the embodiment of the invention.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where computer instructions are stored, and the computer instructions are configured to cause the computer to execute the method for collecting shrinkage rate of a product according to the first aspect of the embodiment of the present invention.
The technical scheme of the invention has the following advantages:
1. the invention provides a method and a system for collecting shrinkage rate of a product, wherein firstly, a space coordinate system of the product is established; obtaining the size of a product mold cavity according to a spatial coordinate system of a product; under the preset condition, actually measuring to obtain the actual size of the product; calculating the shrinkage rate of the product by using the size of the cavity of the product mold and the actual size of the product; and collecting and archiving the shrinkage rate of the product according to the preset priority. The method for measuring the shrinkage rate of the product is determined and shrinkage rate data are collected, so that the accuracy of the shrinkage rate of the product mold is improved, and the development period and the development cost of the product are reduced.
2. According to the method and the system for collecting the shrinkage rate of the product, the same standard space coordinate system is adopted when the coordinate system of the same type of product is established. When the shrinkage rate of the same product is collected, the data required by measurement are carried out by the same coordinate system, and the inconsistency of the collected data caused by different personal habits is avoided, so that the reliability of the collected data and the accuracy of the shrinkage rate of the similar product mold are improved.
3. According to the method and the system for collecting the shrinkage rate of the product, provided by the invention, under the preset condition, the overall dimension of the product and the key dimension influencing the performance of the product are measured by using a mode of measuring and averaging for multiple times, wherein the preset condition comprises the following steps: the product placement time and the product placement temperature. The shrinkage rate of a new product is placed according to the similar products, the state of the tested product is confirmed, the requirement of actual production of the product is met, and the accuracy of placing the shrinkage rate of the product and the reliability of collecting the shrinkage rate of the product are effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a specific example of a method for collecting shrinkage of a product according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a specific example of the coordinate system establishment of a method for collecting shrinkage of a product according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating an example of an actual measurement of a method for collecting shrinkage of a product according to an embodiment of the present invention;
FIG. 4 is a block diagram of a collection system for shrinkage of products according to an embodiment of the present invention;
fig. 5 is a composition diagram of a specific example of a terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The method for collecting the shrinkage rate of the product, provided by the embodiment of the invention, as shown in fig. 1, comprises the following steps:
step S1: and establishing a spatial coordinate system of the product.
In an embodiment of the present invention, establishing a spatial coordinate system of a product includes: when a coordinate system of a similar product is established, a space coordinate system of the same standard is adopted. The direction of the collection shrinkage rate is controlled by establishing a product coordinate system, wherein when the shrinkage rate is collected by the same product, data required by measurement is carried out by the same coordinate system, inconsistency of collected data caused by different habits of individuals is avoided, and reliability of the collected data is improved.
In the embodiment of the present invention, as shown in fig. 2, the process of establishing the spatial coordinate system of the product includes: the plane with the largest product projection area is taken as a first main plane, the normal vector direction of the first main plane is taken as the direction of a Z axis, the geometric center of the projection of the Z axis and the first main plane is taken as the origin of a coordinate system, the direction with the largest length on the first main plane is taken as the direction of an X axis, and the direction vertical to the XZ plane is determined as the direction of the Y axis. By way of example only, and not by way of limitation, in practical applications, a corresponding coordinate system is selected and established according to actual requirements.
Step S2: and obtaining the size of the product mold cavity according to the space coordinate system of the product.
In an embodiment of the invention, the mold cavity dimensions include: product overall dimensions and critical dimensions that affect product performance. Scanning a three-dimensional model of a product to a computer, modeling the three-dimensional model by using computer software, measuring by establishing the same coordinate system for similar products, confirming a measured area of the product, and acquiring the required product outline dimension and the key dimension influencing the product performance, wherein the outline dimension of the product comprises: as shown in fig. 2, the maximum outer contour dimension in XYZ directions of the product may be used as the outer contour dimension of the product, which is only by way of example and not by way of limitation, and corresponding measurement data is selected according to actual requirements in practical applications. Critical dimensions that affect product performance include: according to a certain special requirement of a product, the product needs to be specially designed, such as: when designing the socket, the measurement of the size and depth of the socket, which is the critical dimension affecting the performance of the product, is only by way of example, but not limited thereto, and in practical applications, the measurement is performed according to the actual performance of the product.
Step S3: and under the preset condition, actually measuring to obtain the actual size of the product.
In an embodiment of the invention, the actual dimensions include: product overall dimensions and critical dimensions that affect product performance. According to the related data of the product measured when the size of the product mold cavity is measured, the same data is correspondingly measured when in actual measurement, and measuring tools such as a vernier caliper, a ruler and the like can be adopted when in actual measurement, which is only by way of example and not by way of limitation, and the corresponding tools are selected for measurement in actual application.
In the embodiment of the present invention, the step of actually measuring and acquiring the actual size of the product under the preset condition includes: under the preset condition, measuring the overall dimension of a product and the critical dimension influencing the product performance by utilizing a multiple measurement averaging mode, wherein the preset condition comprises the following steps: the product placement time and the product placement temperature. According to the performance of the product, for example, some products are placed on a surface without heat conduction after being demoulded and cooled to room temperature, and then are measured after being placed in a natural environment for 12 hours, by way of example only, not by way of limitation, in practical application, corresponding preset conditions are selected according to the actual self conditions and actual requirements of the product, the state of the product to be measured is confirmed according to the placing of the shrinkage rate of the new product of the same type of product, so that the actual production requirements of the product are met, and the placing accuracy of the shrinkage rate of the product and the reliability of the shrinkage rate collection of the product are effectively improved.
In practice, a mode of averaging by multiple measurements is adopted to improve the accuracy of data measurement, 25 modules of products to be measured need to be continuously and stably produced, the first and the last parts and the middle modules are extracted from the products to be measured, the number of produced modules and the number of extracted products are only exemplified and not limited, corresponding production and extraction are carried out according to actual requirements in practical application, as shown in fig. 3, the same characteristics can be divided into an upper layer, a middle layer and a lower layer to be measured respectively, multiple-point measurement averaging is adopted for each layer to improve the reliability of product shrinkage rate collection, only by way of example and not limited, and corresponding measurement is carried out according to actual requirements in practical application.
Step S4: and calculating the shrinkage rate of the product by using the size of the cavity of the product mold and the actual size of the product.
In practice, the formula for calculating the shrinkage of a single size of a product is:
the overall shrinkage of the product is the average value of the shrinkage of each cavity.
Step S5: and collecting and archiving the shrinkage rate of the product according to the preset priority.
In the embodiment of the present invention, the collecting and archiving the shrinkage rate of the product according to the preset priority includes: after the shrinkage of a single product is collected, the product is classified and filed according to the use, material grade, main structure shape, external dimension and key dimension of the product. According to the priority, namely according to the application, material brand, main structure shape, external dimension and key dimension of the product, after the shrinkage rate of the product is calculated, the shrinkage rate of the product is collected and filed according to the actual application of the product, so that comparison and management of a manager during subsequent use of data are facilitated, and convenience is provided for a user.
In the embodiment of the invention, archiving is performed according to the properties of the same type of products according to the collected shrinkage rate of the products, wherein the properties of the same type of products comprise: when the product is developed in the same type, the shrinkage rate of the material is inquired according to the actual requirement of inquiry required by an inquirer, so that the inquiry of the inquirer and the management of data are facilitated.
According to the method for collecting the shrinkage rate of the product, provided by the embodiment of the invention, a space coordinate system of the product is established; obtaining the size of a product mold cavity according to a spatial coordinate system of a product; under the preset condition, actually measuring to obtain the actual size of the product; calculating the shrinkage rate of the product by using the size of the cavity of the product mold and the actual size of the product; and collecting and archiving the shrinkage rate of the product according to the preset priority. The method for measuring the shrinkage rate of the product is determined and shrinkage rate data is collected, so that the accuracy of the shrinkage rate of the similar product mold is improved, and the development period and the development cost of the product are reduced.
Example 2
The embodiment of the invention provides a product shrinkage rate collecting system, as shown in fig. 4, comprising:
the coordinate system establishing module 1 is used for establishing a spatial coordinate system of a product; this module executes the method described in step S1 in embodiment 1, and is not described herein again.
The mould cavity size obtaining module 2 is used for obtaining the size of the product mould cavity according to the space coordinate system of the product; this module executes the method described in step S2 in embodiment 1, and is not described herein again.
The actual size acquisition module 3 is used for actually measuring and acquiring the actual size of the product under a preset condition; this module executes the method described in step S3 in embodiment 1, and is not described herein again.
The shrinkage calculation module 4 is used for calculating the shrinkage of the product by utilizing the size of the cavity of the product mold and the actual size of the product; this module executes the method described in step S4 in embodiment 1, and is not described herein again.
The shrinkage rate collecting module 5 is used for collecting and archiving the shrinkage rates of the products according to the preset priority level; this module executes the method described in step S5 in embodiment 1, and is not described herein again.
The embodiment of the invention provides a collecting system for shrinkage rate of a product, which comprises the following steps of firstly, establishing a space coordinate system of the product; obtaining the size of a product mold cavity according to a spatial coordinate system of a product; under the preset condition, actually measuring to obtain the actual size of the product; calculating the shrinkage rate of the product by using the size of the cavity of the product mold and the actual size of the product; and collecting and archiving the shrinkage rate of the product according to the preset priority. The method for measuring the shrinkage rate of the product is determined and shrinkage rate data is collected, so that the accuracy of the shrinkage rate of the similar product mold is improved, and the development period and the development cost of the product are reduced.
Example 3
An embodiment of the present invention provides a terminal, as shown in fig. 5, including: at least one processor 401, such as a CPU (Central Processing Unit), at least one communication interface 403, memory 404, and at least one communication bus 402. Wherein a communication bus 402 is used to enable connective communication between these components. The communication interface 403 may include a Display (Display) and a Keyboard (Keyboard), and the optional communication interface 403 may also include a standard wired interface and a standard wireless interface. The Memory 404 may be a high-speed RAM Memory (Random Access Memory) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The memory 404 may optionally be at least one memory device located remotely from the processor 401. Wherein the processor 401 may execute the collecting method of the shrinkage rate of the product in embodiment 1. A set of program codes is stored in the memory 404, and the processor 401 calls the program codes stored in the memory 404 for executing the collection method of the shrinkage rate of the product in embodiment 1. The communication bus 402 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus 402 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one line is shown in FIG. 5, but this does not represent only one bus or one type of bus. The memory 404 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (english: non-volatile memory), such as a flash memory (english: flash memory), a hard disk (english: hard disk drive, abbreviation: HDD), or a solid-state drive (english: SSD); the memory 404 may also comprise a combination of memories of the kind described above. The processor 401 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.
The memory 404 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (english: non-volatile memory), such as a flash memory (english: flash memory), a hard disk (english: hard disk drive, abbreviation: HDD), or a solid-state drive (english: SSD); the memory 404 may also comprise a combination of memories of the kind described above.
The processor 401 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.
The processor 401 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The aforementioned PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.
Optionally, the memory 404 is also used to store program instructions. The processor 401 may call program instructions to implement the method for collecting shrinkage rate of a product according to embodiment 1.
The embodiment of the invention also provides a computer-readable storage medium, wherein a computer-executable instruction is stored on the computer-readable storage medium, and the computer-executable instruction can execute the method for collecting shrinkage rate of the product in the embodiment 1. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A method for collecting shrinkage rate of a product is characterized by comprising the following steps:
establishing a spatial coordinate system of a product;
obtaining the size of a product mold cavity according to a spatial coordinate system of a product;
under the preset condition, actually measuring to obtain the actual size of the product;
calculating the shrinkage rate of the product by using the size of the cavity of the product mold and the actual size of the product;
and collecting and archiving the shrinkage rate of the product according to the preset priority.
2. The method for collecting shrinkage of products according to claim 1, further comprising: and archiving according to the collected shrinkage of the product according to the performance of the same type of product, wherein the performance of the same type of product comprises the following steps: the usage, structure and size of the product.
3. The method for collecting shrinkage rate of products according to claim 1, wherein the establishing a spatial coordinate system of the products comprises: when a coordinate system of a similar product is established, a space coordinate system of the same standard is adopted.
4. The method for collecting shrinkage rate of products according to claim 3, wherein the process of establishing the spatial coordinate system of the products comprises: the plane with the largest product projection area is taken as a first main plane, the normal vector direction of the first main plane is taken as the direction of a Z axis, the geometric center of the projection of the Z axis and the first main plane is taken as the origin of a coordinate system, the direction with the largest length on the first main plane is taken as the direction of an X axis, and the direction vertical to the XZ plane is determined as the direction of the Y axis.
5. The method for collecting shrinkage rate of products according to claim 1, wherein the dimensions of the mold cavity and the actual dimensions include: product overall dimensions and critical dimensions that affect product performance.
6. The method for collecting shrinkage rate of products according to claim 5, wherein the step of actually measuring and obtaining the actual size of the products under the preset condition comprises: under the preset condition, measuring the overall dimension of a product and the critical dimension influencing the product performance by utilizing a multiple measurement averaging mode, wherein the preset condition comprises the following steps: the product placement time and the product placement temperature.
7. The method for collecting shrinkage rate of products according to claim 1, wherein the step of collecting and archiving shrinkage rate of products according to a predetermined priority comprises: after the shrinkage of a single product is collected, the product is classified and filed according to the use, material grade, main structure shape, external dimension and key dimension of the product.
8. A system for collecting shrinkage of a product, comprising:
the establishment module of the coordinate system, is used for setting up the space coordinate system of the products;
the mould cavity size acquisition module is used for acquiring the size of a product mould cavity according to a space coordinate system of a product;
the actual size acquisition module is used for actually measuring and acquiring the actual size of the product under a preset condition;
the shrinkage calculation module is used for calculating the shrinkage of the product by utilizing the size of the cavity of the product mold and the actual size of the product;
and the shrinkage rate collecting module is used for collecting and archiving the shrinkage rate of the product according to the preset priority level.
9. A terminal, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to cause the at least one processor to perform the method for collecting shrinkage of a product of any of claims 1 to 7.
10. A computer-readable storage medium storing computer instructions for causing a computer to execute the method for collecting shrinkage of a product according to any one of claims 1 to 7.
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| CN112836251A (en) * | 2021-01-20 | 2021-05-25 | 合兴汽车电子股份有限公司 | Method and system for collecting product shrinkage rate accuracy |
| CN118359443A (en) * | 2024-06-20 | 2024-07-19 | 山东硅元新型材料股份有限公司 | Preparation process of ceramic special-shaped piece |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112836251A (en) * | 2021-01-20 | 2021-05-25 | 合兴汽车电子股份有限公司 | Method and system for collecting product shrinkage rate accuracy |
| CN118359443A (en) * | 2024-06-20 | 2024-07-19 | 山东硅元新型材料股份有限公司 | Preparation process of ceramic special-shaped piece |
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