Performance testing method of ceramic core

Abstract

The present invention relates to the field of detection technology. A performance detection method for a ceramic core comprises the following steps: step 1, fixing the ceramic core on a fixture, scanning the geometric shape of the ceramic core using a 3D scanner, and obtaining a first set of 3D scanning data; step 2, spraying gray granular dye on the outer surface of the ceramic core to obtain a colored ceramic core, wherein the gray granular dye is composed of a mixture of water, sugar, sodium chloride, slaked lime powder, and graphite powder; step 3, fixing the colored ceramic core on a fixture, scanning the geometric shape of the colored ceramic core using a 3D scanner, and obtaining a second set of 3D scanning data; step 4, separating the gray granular dye from the outer surface of the ceramic core to obtain a decolorized ceramic core, scanning the geometric shape of the decolorized ceramic core using a 3D scanner, and obtaining a third set of 3D scanning data. The present invention has good detection performance, especially for pits, cavities, and wrinkles on the ceramic core.

Description

Technical Field

[0001] The invention relates to the field of detection technology, and in particular to performance detection of a ceramic core. Background Art

[0002] Ceramic core is one of the most important raw and auxiliary materials in the field of high-temperature alloy precision casting, especially in the casting of hollow blades at the hot end of aircraft engines and gas turbines. The performance of the ceramic core directly determines the cavity distribution state of the hollow blade, directly affects the distribution of the blade wall thickness, and has a crucial impact on the qualified rate of hollow casting blades.

[0003] When using the structured light of a 3D scanner to scan the geometric shape of a ceramic core, there is a common problem of inaccurate detection of structures with depth. Summary of the invention

[0004] The purpose of the present invention is to provide a performance testing method for a ceramic core to solve the above technical problems.

[0005] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0006] The performance testing method of a ceramic core is characterized by comprising the following steps:

[0007] Step 1, fix the ceramic core on the fixture, and use a 3D scanner to scan the geometric shape of the ceramic core to obtain a first set of 3D scanning data;

[0008] Step 2, spraying gray granular dye on the outer surface of the ceramic core with a thickness not exceeding 0.05 mm to obtain a colored ceramic core, wherein the gray granular dye is composed of a mixture of water, sugar, sodium chloride, slaked lime powder, and graphite powder, and the component relationship of the gray granular dye is as follows: 3%-5% of white sugar, 2%-3% of sodium chloride, 40%-50% of slaked lime powder, 1%-2% of graphite powder, and the balance is water;

[0009] Step 3, fix the colored ceramic core on the fixture, and use a 3D scanner to scan the geometric shape of the colored ceramic core to obtain a second set of 3D scanning data;

[0010] Step 4: The gray particle dye is separated from the outer surface of the ceramic core to obtain a decolorized ceramic core, and a 3D scanner is used to perform a geometric shape scan on the decolorized ceramic core to obtain a third set of 3D scanning data;

[0011] The 3D scanning data is the three-dimensional coordinate data of points on the outer surface of the ceramic core;

[0012] The second set of 3D scanning data is compared with the three-dimensional coordinate data of the points on the outer surface of the ceramic core obtained by 3D modeling to determine whether the outer contour size of the ceramic core meets the design requirements; the first set of 3D scanning data is compared with the second set of 3D scanning data to determine the thickness of the gray granular dye sprayed on the outer surface of the ceramic core; the first set of 3D scanning data is compared with the third set of 3D scanning data to determine the cleanliness of the removal of the gray granular dye on the outer surface of the ceramic core.

[0013] Ceramic cores have the characteristics of smooth surface, complex structure and strong reflectivity. The structured light beam in traditional 3D scanning technology is prone to directional reflection and multiple reflection on the surface of ceramic cores, making it difficult to guarantee the accuracy of the detection effect.

[0014] Especially for the pits, cavities, wrinkles and other structures on the ceramic core, a large number of directional reflections and multiple reflections are generated, forming more high light spots, bright spots and dark spots.

[0015] The present invention sprays a gray particle dye on the outer surface of the ceramic core. First, the gray particle dye makes the outer surface of the ceramic core dark and frosted, and can scatter and absorb light that penetrates into the deep structure, thereby improving the optical anti-interference ability, thereby improving the imaging effect, and finally improving the accuracy of the detection result. The gray particle dye of the present invention has low component cost, strong granulation, and more importantly, it is easy and clean to remove, allowing it to be removed by water washing.

[0016] Furthermore, the grayscale granular dye makes the outer surface of the ceramic core have a granular frosted texture, which can effectively reduce highlights, bright spots, and dark spots, thereby reducing light pollution, thereby improving imaging effects and ultimately improving the accuracy of detection results.

[0017] Especially for the pits, cavities and wrinkles on the ceramic core, it has good detection performance.

[0018] Preferably, the clamp includes a support column with a square cross-section, and each of the four side walls of the support column is provided with at least two slide grooves which are parallel to each other and open outward; the clamp also includes a cantilever device, the front end of the cantilever device is connected to an annular ring-shaped component, the center of the annular component is provided with a center hole for the end of the ceramic core to be inserted, the annular component is provided with a bolt hole which passes through inside and outside, and the inner thread of the bolt hole is screwed with a bolt for tightening the end of the ceramic core; the rear end of the cantilever device is connected to a "U"-shaped mounting portion, and the mounting portion includes two mounting frames, and the inner sides of the two mounting frames are provided with sliding blocks matching the slide grooves, and the cantilever device is detachably connected to the support column through the slide grooves and the sliding blocks, the angle between the slide grooves and the horizontal plane is an acute angle, and the plane where the annular component is located and the plane where the mounting portion is located are obtuse angles, and the obtuse angle is the supplementary angle of the acute angle. The present invention optimizes the structure of the fixture, and is very convenient for installation and disassembly. Moreover, the position of the cantilever device can be adjusted by selecting the connected slide slot, thereby adapting to ceramic cores with different geometric shapes and heights. In addition, the present invention limits the position of the annular component and the mounting portion, thereby improving the stress of the cantilever device and making the ceramic core more stably fixed on the cantilever device.

[0019] Preferably, it further comprises an isolation cover and a chassis, wherein the support column stands in the middle of the chassis, the isolation cover is arranged outside the support column, and an opening is arranged at the bottom of the isolation cover, and the opening is closed by the chassis. Thus, the isolation cover and the chassis are used to construct a closed structure, which, on the one hand, reduces the influence of environmental factors on the test results, and on the other hand, uses the closed structure to create a closed heating environment for the ceramic core to test the performance of the ceramic core during the heating process, the cooling process or at high temperature.

[0020] As a preferred solution, the performance testing method of the ceramic core further includes the following steps:

[0021] Step 5: An isolation cover is arranged outside the fixture, so that the ceramic core is located inside the isolation cover and the 3D scanner is located outside the isolation cover;

[0022] Step 6, gradually raising the temperature in the isolation cover to a specified temperature, wherein the specified temperature is one of 100° C.-200° C. After reaching the specified temperature, maintaining the specified temperature for 1 hour, performing a geometric shape scan every 5° C. during the temperature increase process, obtaining a fourth set of 3D scanning data, and performing a geometric shape scan every 20 minutes during the temperature maintenance process, obtaining a fifth set of 3D scanning data;

[0023] Step 7, removing the isolation cover to gradually reduce the temperature of the ceramic core to room temperature, and performing a geometric shape scan after the temperature of the ceramic core reaches room temperature to obtain a sixth set of 3D scanning data;

[0024] The fourth set of 3D scanning data is compared with the second set of 3D scanning data to determine whether the ceramic core has crack defects; the fifth set of 3D scanning data is compared with the second set of 3D scanning data to determine the high temperature resistance of the ceramic core; the sixth set of 3D scanning data is compared with the first set of 3D scanning data to determine whether the deformation of the ceramic core meets the design requirements. In this way, the performance of the ceramic core during heating, at high temperature, and after cooling is tested.

[0025] Preferably, there are an even number of cantilever devices, and every two form a group. One cantilever device in the same group is located at the upper part of the support column, serving as an upper cantilever; the other cantilever device is located at the lower part of the support column, serving as a lower cantilever. The upper end of the ceramic core is inserted into the annular component of the upper cantilever, and the lower end is inserted into the annular component of the lower cantilever. A plastic sheet is sandwiched between the end of the ceramic core and the bolt, and the melting temperature of the plastic sheet is lower than the specified temperature. Thus, the plastic sheet gradually melts as the temperature rises to make room for the ceramic core, ensuring that the ceramic core has sufficient and unlimited thermal expansion and contraction, thereby making the detection data more accurate.

[0026] Preferably, the isolation cover is a quartz glass cover, so as to provide heat insulation and light transmission.

[0027] Preferably, the support column and the cantilever device are made of a ceramic material that can withstand 1700°C. Thus, the fixture can be used not only during testing, but also during production. Of course, the fixture can be used to produce ceramic cores directly, and then the newly produced ceramic cores can be tested directly on the fixture. This not only saves the heating process, but also the test temperature is higher, and test data at a higher temperature can be obtained.

[0028] As another preferred solution, the following steps are used to replace step 1 and step 2: step a. use a 3D scanner to perform geometric shape scanning on the ceramic core just produced in a high temperature state to obtain a seventh set of 3D scanning data; step b. gradually reduce the temperature of the ceramic core to 60°C-70°C, spray gray granular dye on the outer surface of the ceramic core to obtain a colored ceramic core;

[0029] The seventh set of 3D scanning data is compared with the second set of 3D scanning data to determine whether the ceramic core has crack surface shrinkage defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0031] Figure 1 This is a reference diagram of the fixture usage status when installing a ceramic core;

[0032] Figure 2 yes Figure 1 Side view of the middle structure;

[0033] Figure 3 yes Figure 1 A top view of the structure in the middle;

[0034] Figure 4 This is a reference diagram of the fixture usage status when installing two ceramic cores;

[0035] Figure 5 This is a top view of the fixture when four sets of cantilever devices are installed.

[0036] Explanation of symbols: 1. Support column; 2. Chassis; 3. Isolation cover; 4. Cantilever device; 5. Ceramic core. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0040] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0041] Example 1, reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5The performance detection method of the ceramic core comprises the following steps: Step 1, fixing the ceramic core 5 on a fixture, and using a 3D scanner to perform a geometric shape scan on the ceramic core 5 to obtain a first set of 3D scanning data. Step 2, spraying a gray granular dye on the outer surface of the ceramic core 5 to obtain a colored ceramic core, wherein the gray granular dye is composed of a mixture of water, sugar, sodium chloride, slaked lime powder, and graphite powder. Step 3, fixing the colored ceramic core on a fixture, and using a 3D scanner to perform a geometric shape scan on the colored ceramic core to obtain a second set of 3D scanning data. Step 4, separating the gray granular dye from the outer surface of the ceramic core 5 to obtain a decolorized ceramic core, and using a 3D scanner to perform a geometric shape scan on the decolorized ceramic core to obtain a third set of 3D scanning data.

[0042] The gray granular dye is very thin, and the second set of 3D scanning data can be directly used as the geometric shape data of the ceramic core 5. The thickness of the gray granular dye does not exceed 0.05mm. The cleanliness of the removal of the gray granular dye can be judged by comparing the third set of 3D scanning data with the first set of 3D scanning data. If it is not removed cleanly, continue to rinse until it is clean. Compare the second set of 3D scanning data with the three-dimensional coordinate data of the points on the outer surface of the ceramic core 5 obtained by 3D modeling to determine whether the outer contour size of the ceramic core 5 meets the design requirements; compare the first set of 3D scanning data with the second set of 3D scanning data to determine the thickness of the gray granular dye sprayed on the outer surface of the ceramic core 5; compare the first set of 3D scanning data with the third set of 3D scanning data to determine the cleanliness of the removal of the gray granular dye on the outer surface of the ceramic core 5.

[0043] The fixture includes a support column 1 with a square cross section, and the four side walls of the support column 1 are each provided with at least two slide grooves that are parallel to each other and open outward; the fixture also includes a cantilever device 4, the front end of the cantilever device 4 is connected with a ring-shaped annular component, the center of the annular component is provided with a center hole for the end of the ceramic core 5 to be inserted, the annular component is provided with a bolt hole that penetrates inside and outside, and the bolt hole is threaded with a bolt for tightening the end of the ceramic core 5; the rear end of the cantilever device 4 is connected with a "U"-shaped mounting portion, the mounting portion includes two mounting frames, and the inner sides of the two mounting frames are provided with a slider matching the slide groove, and the cantilever device 4 is detachably connected to the support column 1 through the slide groove and the slider. The present invention optimizes the structure of the fixture, and installation and disassembly are very convenient, and the position of the cantilever device 4 can be adjusted by selecting the connected slide groove, thereby adapting to ceramic cores 5 of different geometric shapes and heights.

[0044] Embodiment 2, the performance detection method of ceramic core, comprises the following steps: Step 1, fix the ceramic core 5 on the fixture, use the 3D scanner to scan the geometric shape of the ceramic core 5, and obtain the first set of 3D scanning data. Step 2, spray the gray granular dye on the outer surface of the ceramic core 5 to obtain a colored ceramic core, and the gray granular dye is composed of a mixture of water, sugar, sodium chloride, slaked lime powder, and graphite powder. Step 3, fix the colored ceramic core on the fixture, use the 3D scanner to scan the geometric shape of the colored ceramic core, and obtain the second set of 3D scanning data. Step 4, make the gray granular dye detach from the outer surface of the ceramic core 5 to obtain a decolorized ceramic core, use the 3D scanner to scan the geometric shape of the decolorized ceramic core, and obtain the third set of 3D scanning data. Step 5, set an isolation cover 3 outside the fixture, so that the ceramic core 5 is located in the isolation cover 3, and the 3D scanner is located outside the isolation cover 3. The isolation cover 3 is a quartz glass cover. So that it is heat-insulating and light-transmissive. Step 6, gradually increase the temperature in the isolation cover 3 to the specified temperature, and after reaching the specified temperature, maintain the specified temperature for 1 hour. During the heating process, perform a geometric shape scan every 5°C to obtain the fourth set of 3D scanning data. During the process of maintaining the specified temperature, perform a geometric shape scan every 20 minutes to obtain the fifth set of 3D scanning data. The specified temperature can be set according to the temperature resistance requirement of the ceramic core 5, usually 100°C-200°C. Step 7, remove the isolation cover 3, gradually reduce the temperature of the ceramic core 5 until room temperature, and perform a geometric shape scan after the temperature of the ceramic core 5 reaches room temperature to obtain the sixth set of 3D scanning data. In this embodiment, it also includes an isolation cover 3 and a chassis 2, the support column 1 stands in the middle of the chassis 2, the isolation cover 3 is set outside the support column 1, and the bottom of the isolation cover 3 is provided with an opening, and the opening is closed by the chassis 2. The heating device can be set on the chassis 2. A through hole can also be opened on the chassis 2, and a furnace head is provided below the through hole, and the furnace head is used to heat the space in the isolation cover 3. The support column 1 is located at the center of the chassis 2, and preferably has at least three through holes, which are arranged at equal intervals and form a ring around the central axis of the support column 1. The fourth group of 3D scanning data is compared with the second group of 3D scanning data to determine whether the ceramic core 5 has crack defects; the fifth group of 3D scanning data is compared with the second group of 3D scanning data to determine the high temperature resistance of the ceramic core 5; the sixth group of 3D scanning data is compared with the first group of 3D scanning data to determine whether the deformation of the ceramic core 5 meets the design requirements.

[0045] Embodiment 3, based on the detection methods of the above-mentioned embodiments 1 and 2, the following steps are used to replace step 1 and step 2: Step a. Use a 3D scanner to perform a geometric shape scan on the ceramic core 5 that has just been produced in a high-temperature state to obtain the seventh group of 3D scanning data. The seventh group of 3D scanning data is compared with the second group of 3D scanning data to determine whether the ceramic core 5 has crack surface shrinkage defects. Here, step 1 and step 2 are replaced by removing step 1 and step 2 in embodiment 1 and embodiment 2, replacing them with step a and step b, and retaining the remaining steps. In this embodiment 3, because step 1 is removed, the first group of 3D scanning data will not be generated, and the third group of 3D scanning data can be used to replace the first group of 3D scanning data to judge the performance of the ceramic core 5.

[0046] The ceramic core 5 is directly produced on the fixture, and the temperature of the newly produced ceramic core 5 is relatively high, usually exceeding 200°C. Step b. Gradually lower the temperature of the ceramic core 5 to 60°C-70°C, spray gray granular dye on the outer surface of the ceramic core 5 to obtain a colored ceramic core. On the one hand, the use of gray granular dye can accelerate the cooling of the ceramic core 5, and on the other hand, it can accelerate the evaporation of water molecules in the gray granular dye, thereby avoiding the flow of the gray granular dye, and making the spraying more uniform. The support column 1 and the cantilever device 4 are preferably made of a ceramic material that is resistant to 1700°C. This material ensures that each component of the fixture has good heat shock resistance during production, especially when exposed to heat.

[0047] In the above embodiments, there are an even number of cantilever devices 4, and each two form a group. One cantilever device 4 in the same group is located at the upper part of the support column 1, serving as an upper cantilever; the other cantilever device 4 is located at the lower part of the support column 1, serving as a lower cantilever. The upper end of the ceramic core 5 is inserted into the annular part of the upper cantilever, and the lower end is inserted into the annular part of the lower cantilever. In Example 2, a plastic sheet is sandwiched between the end of the ceramic core 5 and the bolt, and the melting temperature of the plastic sheet is lower than the specified temperature. As a result, the plastic sheet gradually melts as the temperature rises to make room for the ceramic core 5, ensuring that the ceramic core 5 has sufficient and unlimited thermal expansion and contraction, thereby making the detection data more accurate. The thickness of the plastic sheet is preferably 0.1mm-0.15mm.

[0048] In the above-mentioned embodiments, the component relationship of the gray granular dye is a mass ratio of 3%-5% white sugar, 2%-3% sodium chloride, 40%-50% slaked lime powder, 1%-2% graphite powder, and the balance is water. This component has low cost and strong granulation. More importantly, it is easy and clean to remove, and allows removal by water flushing. The warm salt water flushing. Thereby improving the removal efficiency. Preferably, a metal mesh is preferably provided between the nozzle and the ceramic core 5, and the metal mesh is connected to the electrode of the electrostatic generator. So that the gray granular dye is charged during the spraying process, on the one hand, it can be electrostatically adsorbed on the ceramic core 5, thereby improving the adhesion of the gray granular dye. On the other hand, the gray granular dye particles repel each other due to static electricity, so that the spraying is more uniform and the coating is thinner.

[0049] In the above embodiments, the chute is divided into two categories, one is a clockwise inclined chute, called a lower inclined chute; the other is a counterclockwise inclined chute, called an upper inclined chute. A lower inclined chute and an upper inclined chute are provided on any side wall of the support column 1. The upper inclined chute opened on the same side wall of the support column 1 is evenly spaced and spread all over the side wall, thereby forming a first tooth structure; the lower inclined chute opened on the same side wall of the support column 1 is evenly spaced and spread all over the side wall, thereby forming a second tooth structure; the first tooth structure and the second tooth structure are staggered on the side wall of the support column 1 to form a diamond grid structure. Thus, more cantilever devices 4 can be plugged in, thereby increasing the number of ceramic cores 5 participating in the test. More importantly, the direction of the cantilever can be changed by utilizing the different directions of the chute, thereby making the ceramic cores 5 non-interfering with each other. At least one row of the intersection points of the first tooth structure and the second tooth structure is located at the edge of the two side walls of the support column 1. The opening area is thereby enlarged by utilizing the staggered points, thereby reducing the difficulty of plugging in the cantilever device 4 .

[0050] In the above embodiments, the angle between the slide groove and the horizontal plane is an acute angle, and the plane where the annular component is located and the plane where the mounting portion is located are obtuse angles, and the obtuse angle is the supplementary angle of the acute angle. The cantilever device 4, together with the weight of the ceramic core 5 to be tested clamped on the cantilever device 4, is transmitted to the support column 1. According to the principle of force decomposition, the vertically downward gravity is decomposed into two directions of force along the inclination angle and perpendicular to the inclination angle. Therefore, the heavier the weight of the cantilever device 4 and the ceramic core 5 to be tested, the greater the force decomposed backward along the inclination angle. The force backward along the inclination angle keeps the cantilever device 4 firmly on the support column 1 without falling off, thereby meeting the requirement that the cantilever device 4 is firmly installed on the support column 1.

[0051] In the above embodiments, the upper and lower edges of the mounting frame are each provided with flanges extending toward the other mounting frame, and the flanges are used as the sliders. Two sliders are provided on the same mounting frame to share the weight of the cantilever device 4, making the cantilever device 4 connected to the support column 1 more stable.

[0052] In the above embodiments, the outer contour of the cross section of the annular component is square, and a bolt hole is formed on each of the four side walls of the annular component. The width of the cantilever device 4 gradually decreases from the rear end to the front end, and the middle part is arc-shaped and arranged on the right side of the central axis; the middle part of the cantilever device 4 is connected to the middle of two adjacent bolt holes of the annular component. There is an acute angle between the middle part of the cantilever device 4 and the annular component, and the central axis of the central hole of the annular component is parallel to the central axis of the support column 1. The beneficial effect of such a connection is that the two operating areas for tightening the rear side bolts and tightening the right side bolts are staggered from the arm body of the cantilever to improve the convenience of operation.

[0053] In the above embodiments, the detection frequency should be ≥5 pieces / batch, and the detection frequency under batch production conditions should be ≥2 pieces / batch. The 3D scanner preferably uses structured light for blue light scanning to determine the outer contour size of the ceramic core 5 under six-point positioning conditions. In addition to geometric shape detection, the surface penetration test can also be performed on the batch of ceramic cores 5 to be inspected to determine that the ceramic core 5 has no surface shrinkage holes, cracks and other defects.

[0054] In the above embodiments, the pulling rate and pulling distance can also be tested during the heating process. The data at each location can be compared with the second set of data or the first set of data to evaluate the deformation of the ceramic core 5; the maximum deformation should be less than d / 4, d is the casting wall thickness tolerance band, and if the above conditions are not met, the entire batch of ceramic cores 5 will be scrapped.

[0055] In the above embodiments, the data after cooling can be compared with the data before heating to assist in determining whether there is a through crack. For a ceramic core 5 with surface cracks, the cracked part should be cut after the surface is bluing, and the crack depth should be less than 0.5 mm, otherwise it will be scrapped.

[0056] In the above design, both ends of the ceramic core 5 of the batch to be tested are provided with rounded rectangular structures, and a circular groove corresponding to the bolt head is provided on the side wall of the rounded rectangle at one end. The beneficial effect is that the bolt head and the groove cooperate to fix the core more firmly.

[0057] In the above design, the upper end of the ceramic core 5 of the batch to be tested is fixed on the cantilever device 4, and the lower end is affixed with a plastic sheet and clamped in the middle by four bolts. The plastic sheet will vaporize at high temperature, and then a distance between the plastic sheet and the side wall of the rounded rectangle at the lower end and the four bolt heads is maintained, that is, a gap of 0.1~0.15mm. The beneficial effect of this design is that it can limit the radial movement of the ceramic core 5 and allow the ceramic core 5 to be retractable in the axial direction at high temperature.

[0058] In the above design, before the ceramic cores 5 of the batch to be tested undergo a heating and cooling process that simulates the high-temperature casting process in the heating device, the outer contour size of the ceramic core 5 is first determined by blue light scanning under six-point positioning conditions, and then a surface penetration test is performed to determine that the ceramic core 5 has no surface shrinkage holes, cracks and other defects, and then heat exposure is performed in the heating device. The heat exposure process simulates the high-temperature casting process. After the heat exposure is completed, it is naturally cooled, and a blue light scan is performed again to determine the outer contour size of the ceramic core 5, and the result is compared with the result before the heat exposure. It is judged whether the qualified conditions are met based on the maximum deformation; the ceramic core 5 with qualified deformation continues to undergo surface penetration inspection. If surface cracks appear, the surface is first blue-penetrated, and then the crack site is cut, and a qualified judgment is made based on the crack depth.

[0059] The beneficial effect of the above design is that the ceramic core 5 to be tested is placed in a heating device, and the same heating process as that of casting a high-temperature alloy hollow blade is performed. The outer contour dimensions and surface crack conditions of the ceramic core 5 before and after this process are recorded and compared to judge the qualification of the ceramic core 5, thereby shortening the development cycle of the high-temperature alloy hollow blade casting process, greatly reducing the alloy material loss, production capacity loss, and time loss caused by the mismatch of the ceramic core 5, and can significantly improve the qualification rate of castings.

[0060] Furthermore, heat exposure is performed. For the batch of ceramic cores 5 to be inspected for equiaxed castings, a roasting furnace is used as a heating device. After the heat exposure process is completed, the batch of ceramic cores 5 to be inspected are removed after cooling for inspection.

[0061] Furthermore, thermal exposure is implemented. For the batch of ceramic cores 5 to be inspected for directional and single crystal castings, a single crystal furnace is used as a heating device, and a detection device is placed on the crystallizer. After cooling, the batch of ceramic cores 5 to be inspected are removed for inspection.

[0062] The above design determines the type of heating device according to the purpose of the ceramic core 5 to be inspected. The beneficial effect is that the ceramic core 5 to be inspected is closer to the actual high-temperature casting process, making the detection result more real and effective. It can be used to guide the casting process of high-temperature alloy hollow blades, reduce the alloy material loss, production capacity loss, and time loss caused by the mismatch of the ceramic core 5, and can significantly improve the qualified rate of castings.

[0063] The beneficial effect of the present invention is that all components of the detection device are made of ceramic materials that can withstand 1700° C., and when the ceramic core 5 to be detected is subjected to heat exposure in the heating device, the detection device has good heat shock resistance.

[0064] The beneficial effect of the present invention also lies in that a protective cover is provided to mount the support rod, the cantilever, and the ceramic core 5 to be tested on the base, thereby isolating the airflow and pollutant interference in the measurement environment and simulating the actual working environment of the ceramic core 5, thereby providing a direct and accurate evaluation of the performance of the ceramic core 5 for precision casting of hollow blades.

[0065] The beneficial effect of the present invention is that, by executing the detection method of the ceramic core 5 for precision casting of hollow blades, the alloy material loss, production capacity loss, and time loss caused by the mismatch of the ceramic core 5 can be reduced, and the qualified rate of castings can be significantly improved, shortening the development cycle of the high-temperature alloy hollow blade casting process.

[0066] The above design determines the heating method, heating rate, and final temperature after heating according to the purpose of the ceramic core 5 to be inspected. The beneficial effect is that the ceramic core 5 to be inspected is closer to the actual high-temperature casting process, making the test result more real and effective. It can be used to guide the casting process of high-temperature alloy hollow blades, reduce the alloy material loss, production capacity loss, and time loss caused by the mismatch of the ceramic core 5, and can significantly improve the qualified rate of castings.

[0067] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0068] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for detecting the performance of a ceramic core, characterized in that: The steps include: Step 1, fix the ceramic core on the fixture, and use a 3D scanner to scan the geometric shape of the ceramic core to obtain a first set of 3D scanning data; Step 2, spraying gray granular dye on the outer surface of the ceramic core with a thickness not exceeding 0.05 mm to obtain a colored ceramic core, wherein the gray granular dye is composed of a mixture of water, sugar, sodium chloride, slaked lime powder, and graphite powder, and the component relationship of the gray granular dye is as follows: 3%-5% of white sugar, 2%-3% of sodium chloride, 40%-50% of slaked lime powder, 1%-2% of graphite powder, and the balance is water; Step 3, fix the colored ceramic core on the fixture, and use a 3D scanner to scan the geometric shape of the colored ceramic core to obtain a second set of 3D scanning data; Step 4: The gray particle dye is separated from the outer surface of the ceramic core to obtain a decolorized ceramic core, and a 3D scanner is used to perform a geometric shape scan on the decolorized ceramic core to obtain a third set of 3D scanning data; The 3D scanning data is the three-dimensional coordinate data of points on the outer surface of the ceramic core; The second set of 3D scanning data is compared with the three-dimensional coordinate data of the points on the outer surface of the ceramic core obtained by 3D modeling to determine whether the outer contour size of the ceramic core meets the design requirements; the first set of 3D scanning data is compared with the second set of 3D scanning data to determine the thickness of the gray granular dye sprayed on the outer surface of the ceramic core; the first set of 3D scanning data is compared with the third set of 3D scanning data to determine the cleanliness of the removal of the gray granular dye on the outer surface of the ceramic core.

2. The performance testing method of the ceramic core according to claim 1, characterized in that: The clamp includes a support column with a square cross-section, and each of the four side walls of the support column is provided with at least two slide grooves parallel to each other and opening outward; the clamp also includes a cantilever device, the front end of the cantilever device is connected to an annular ring-shaped component, the center of the annular component is provided with a center hole for the end of the ceramic core to be inserted, the annular component is provided with a bolt hole penetrating inside and outside, and the inner thread of the bolt hole is screwed with a bolt for tightening the end of the ceramic core; the rear end of the cantilever device is connected to a "U"-shaped mounting portion, and the mounting portion includes two mounting frames, and the inner sides of the two mounting frames are provided with sliders matching the slide grooves, and the cantilever device is detachably connected to the support column through the slide grooves and the sliders, the angle between the slide grooves and the horizontal plane is an acute angle, and the plane where the annular component is located and the plane where the mounting portion is located are obtuse angles, and the obtuse angle is the supplementary angle of the acute angle.

3. The performance testing method of the ceramic core according to claim 2, characterized in that: It also includes an isolation cover and a chassis. The support column stands in the middle of the chassis. The isolation cover is arranged outside the support column. An opening is arranged at the bottom of the isolation cover, and the opening is closed by the chassis.

4. The performance testing method of the ceramic core according to claim 3, characterized in that: The following steps are also included: Step 5: An isolation cover is arranged outside the fixture, so that the ceramic core is located inside the isolation cover and the 3D scanner is located outside the isolation cover; Step 6, gradually raising the temperature in the isolation cover to a specified temperature, wherein the specified temperature is one of 100° C.-200° C. After reaching the specified temperature, maintaining the specified temperature for 1 hour, performing a geometric shape scan every 5° C. during the temperature increase process, obtaining a fourth set of 3D scanning data, and performing a geometric shape scan every 20 minutes during the temperature maintenance process, obtaining a fifth set of 3D scanning data; Step 7, removing the isolation cover to gradually reduce the temperature of the ceramic core to room temperature, and performing a geometric shape scan after the temperature of the ceramic core reaches room temperature to obtain a sixth set of 3D scanning data; The fourth set of 3D scanning data is compared with the second set of 3D scanning data to determine whether the ceramic core has crack defects; the fifth set of 3D scanning data is compared with the second set of 3D scanning data to determine the high temperature resistance of the ceramic core; the sixth set of 3D scanning data is compared with the first set of 3D scanning data to determine whether the deformation of the ceramic core meets the design requirements.

5. The performance testing method of the ceramic core according to claim 4, characterized in that: There are an even number of cantilever devices, and every two form a group. One cantilever device in the same group is located at the upper part of the support column and serves as an upper cantilever; the other cantilever device is located at the lower part of the support column and serves as a lower cantilever. The upper end of the ceramic core is inserted into the annular part of the upper cantilever, and the lower end is inserted into the annular part of the lower cantilever. A plastic sheet is sandwiched between the end of the ceramic core and the bolt, and the melting temperature of the plastic sheet is lower than the specified temperature.

6. The performance testing method of the ceramic core according to claim 3, characterized in that: The isolation cover is a quartz glass cover.

7. The performance testing method of a ceramic core according to any one of claims 2 to 6, characterized in that: The supporting columns and cantilever devices are made of ceramic materials that can withstand temperatures of 1700°C.

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