Blade multi-layer mold shell thickness nondestructive measurement device and measurement method

Abstract

The invention discloses a blade multi-layer mold shell thickness nondestructive measurement device and method, and belongs to the technical field of precision casting of aero-engine parts, and the method comprises the following steps: connecting a reference rod to a blade wax mold, and scanning the blade wax mold; refractory slurry and refractory sand are sprayed on the blade wax mold; the blade wax mold is scanned for the second time, and a three-dimensional model containing the wax mold appearance and a layer of mold shell at the same time is obtained; spraying a second layer of refractory slurry and refractory sand on the blade wax mold; scanning the blade wax mold for the third time, and fitting the result of the third time of scanning to the results of the first two times of scanning to obtain a three-dimensional model containing the shape of the wax mold, the first layer of mold shell and the second layer of mold shell at the same time; and by parity of reasoning, a three-dimensional model with multiple layers of mold shell surfaces is obtained, so that the thickness of each layer of mold shell at different positions of the blade can be measured and calculated. The method does not depend on the skill level of an operator, multiple measurements before and after have a uniform reference standard, the operation is very convenient, and the measurement precision is high.

Description

Technical Field

[0001] The present application relates to the technical field of precision casting of aircraft engine parts, and in particular, to a non-destructive measuring device for the thickness of a blade multi-layer mold shell. In addition, the present application also relates to a measuring method including the above-mentioned non-destructive measuring device for the thickness of a blade multi-layer mold shell. Background Art

[0002] The information provided in this section is for the purpose of generally presenting the background of the present application. To the extent described in this section, the work of the presently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present application.

[0003] In order to improve the temperature bearing capacity of the hot end blades of aircraft engines, there are usually three mainstream technologies. The hollow air cooling design of the blade is an important one. The cold air passes through the complex channels inside the blade to take away the heat of the blade. When the blade has a cavity, considering the performance and safety requirements such as the strength of the blade when rotating at high temperature and high speed, the heat exchange efficiency when the cold air passes through the inner cavity, etc., the wall thickness dimension from the cavity area to the blade surface is often required.

[0004] Investment casting is still the main production process for producing aircraft engine turbine blades. The main processes are mold making, shell making, pouring and post-processing. Shell making is the process of applying a specified number of layers of refractory slurry and refractory materials to the wax mold tree, and after drying, preparing a shell with a cavity. At present, this process can be achieved manually or automatically.

[0005] The effect of wax model tree slurry coating is directly related to the operator or robot control program. Usually, when manual spraying is used, the operator needs to observe the slurry flow and adjust the posture of the module to avoid slurry accumulation, ensure uniform slurry coating, and finally obtain a mold shell with uniform thickness. However, due to uncontrollable factors such as the fluctuation of slurry viscosity (fluidity evaluation index) and the operator's skill level, the actual mold shell is prone to uneven thickness, which affects the solidification sequence of the casting and deteriorates the metallurgical quality of the casting.

[0006] During the manufacturing process, we face a more difficult problem, namely, how to measure the thickness of each layer of mold shell at different positions of the blade?

[0007] On the one hand, the mold shell is attached to the surface of the wax model, so its overall shape is consistent with the outer shape of the wax model and has a complex three-dimensional curved surface; on the other hand, the mold shell is composed of slurry sand, and the sand particles themselves have irregular shapes, which also determines the uneven characteristics of the mold shell surface. This is even more so as the number of mold shell layers increases and the size of the sand particles increases.

[0008] The industry has a method of using CT transillumination to obtain the wall thickness of complex hollow castings. However, this method is difficult to achieve satisfactory imaging results for mold shells composed of refractory powder and refractory gravel with similar density, and it is also impossible to characterize and measure because the interface between each layer of the mold shell is not clear.

[0009] After long-term research, we have proposed a method to measure the thickness of each layer of the mold shell at different positions of the blade for such a difficult measurement object.

[0010] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0011] In view of at least one of the above technical problems, the present application provides a non-destructive measurement device for the thickness of the blade multi-layer mold shell. After the reference rod is clamped, the reference rod and the blade wax mold are driven by a motor to rotate. At this time, the slurry spraying operation is performed by a spray gun, which can effectively improve the uniformity of the slurry.

[0012] At the same time, the present application also provides a measurement method using the above-mentioned blade multi-layer shell thickness non-destructive measurement device.

[0013] According to one aspect of the present application, a non-destructive measuring device for the thickness of a blade multi-layer mold shell is provided, which is used to clamp a blade wax mold and spray refractory slurry and refractory sand on the blade wax mold through a spray gun to form a mold shell on its surface. The non-destructive measuring device for the thickness of the blade multi-layer mold shell includes a reference rod, a mounting table, a spray box, a limit plate assembly, a push rod assembly, a gear pair assembly and a motor:

[0014] The reference rod is used to connect to the riser of the blade wax model tenon, and a plurality of reference grooves are arranged at intervals on the reference rod, and the reference grooves are used to stick sticker-like reference points, and bearings are arranged at intervals on the reference rod;

[0015] The spray box is arranged beside the mounting table, and a limiting groove is arranged on the top of the mounting table. The limiting groove is used to limit the reference rod and the bearing and enable the blade wax mold to be rotatably suspended in the spray box. The limiting plate assemblies are arranged on both sides of the limiting groove, and the push rod assemblies are arranged in pairs on both sides of the limiting groove. The limiting plate assemblies on both sides are respectively connected to the push rod assemblies on both sides. The push rod assemblies on both sides are used to push the limiting plate assemblies on both sides to close to clamp the bearing to limit, or separate to loosen the limit on the bearing.

[0016] A mounting hole is provided on the side wall of the mounting platform away from the spray box. The motor is arranged in the mounting hole and drives the reference rod and the blade wax model to rotate through the gear pair assembly, and then the refractory slurry and refractory sand are sprayed on the blade wax model during the rotation through the spray gun.

[0017] In some embodiments of the present application, the limit plate assembly includes a first limit plate and a second limit plate arranged at intervals along the length direction of the limit groove, and two of the first limit plate and the second limit plate are provided. The two first limit plates are respectively arranged on both sides of the limit groove and are respectively connected to the push rod assemblies on both sides, and the two second limit plates are respectively arranged on both sides of the limit groove and are respectively connected to the push rod assemblies on both sides.

[0018] In some embodiments of the present application, the push rod assembly includes a push rod, a rotating member and a support plate. The push rod is used to be connected to the first limit plate and the second limit plate on one side of the limit groove at the same time. The support plate is arranged on the top of the mounting platform and is spaced apart from the push rod. A connecting screw hole is arranged on the support plate. The rotating member is used to cooperate with the connecting screw hole thread. The first end of the rotating member is used to connect to a preset connecting bearing on the push rod. The rotating member is used to drive the push rod to perform a translational movement close to or away from the limit groove during the process of screwing in or out of the connecting screw hole, thereby driving the first limit plate and the second limit plate on both sides to close and tighten the outer ring of the bearing or separate to loosen the limit on the bearing.

[0019] In some embodiments of the present application, a hand wheel is provided at the second end of the rotating member.

[0020] In some embodiments of the present application, the gear pair assembly includes a driving wheel and a driven wheel, the driving wheel is connected to the output shaft of the motor, the driven wheel is arranged at the tail end of the reference rod, and the driving wheel is used to mesh with the driven wheel and drive the driven wheel to rotate.

[0021] In some embodiments of the present application, the bearings are disposed on both sides of the reference rod and are disposed away from the reference groove.

[0022] In some embodiments of the present application, the top of the spray box is open, the interior of the spray box is used to hold clean water, and a drainage outlet is provided at the bottom of the spray box.

[0023] According to another aspect of the present application, a method for non-destructive measurement of the thickness of a blade multi-layer mold shell is provided, using the above-mentioned non-destructive measurement device for the thickness of a blade multi-layer mold shell, which comprises the following steps:

[0024] S100, connecting the reference rod to the tenon riser of the blade wax mold, and pasting the reference point in the reference groove;

[0025] S200, use a blue light scanner to scan the blade wax model, and obtain the original wax model size model on the ATOS software;

[0026] S300, wrap the reference rod with tape;

[0027] S400, spraying refractory slurry and refractory sand on the blade wax model with a spray gun, and leaving the blade wax model coated with the refractory slurry and refractory sand to stand and dry;

[0028] S500, removing the tape wrapped on the reference rod, scanning the blade wax model for a second time using a blue light scanner, and fitting the second scanning result with the scanning result in step S200 on the ATOS software through the precise reference points on the reference rod to obtain a three-dimensional model containing both the wax model shape and a layer of mold shell;

[0029] S600, wrap the reference rod again with tape, spray the second layer of refractory slurry and refractory sand on the blade wax mold with a spray gun, and let it stand and dry;

[0030] S700, removing the tape wrapped on the reference rod, scanning the blade wax model for the third time using a blue light scanner, and fitting the third scanning result to the first two scanning results using the reference reference points on the reference rod on the ATOS software to obtain a three-dimensional model containing the wax model shape, the first layer mold shell, and the second layer mold shell;

[0031] S800, and so on, to obtain a three-dimensional model with a multi-layer mold shell surface for measuring and calculating the thickness of each layer of the mold shell at different positions of the blade.

[0032] In some embodiments of the present application, in step S300 and step S600, when the reference rod is wrapped with tape, the tape needs to cover and shield the reference point, while the tape does not cover the blade wax model.

[0033] In some embodiments of the present application, in step S800, the thickness of each layer of the mold shell at different positions of the blade is obtained by using the three-dimensional model processing software Geomagic.

[0034] This application has the following beneficial effects:

[0035] The present application discloses a non-destructive measuring device for the thickness of a blade multilayer shell. The reference rod is connected to the blade wax mold. The reference rod is provided with reference grooves at intervals to facilitate the pasting of the reference reference points in the shape of stickers, so as to serve as the reference points for scanning measurement. The reference grooves at intervals are conducive to improving the accuracy of the reference reference points pasted each time, and preventing the reference reference points in the shape of stickers from loosening and deviating. At the same time, the reference rod is limited by the limiting groove of the mounting table, and the blade wax mold is suspended in the spray box. The outer ring of the bearing on the reference rod is clamped and limited by the push rod assembly and the limiting plate assembly. The motor is used to drive the reference rod and the blade wax mold to rotate through the gear pair. At this time, the operator sprays the blade wax mold through the spray gun, reducing the phenomenon of shaking or vibration caused by the manual grip of the blade wax mold, effectively ensuring the uniformity of the slurry coating, avoiding affecting the solidification sequence of the casting, and ensuring the metallurgical quality of the casting.

[0036] The non-destructive measurement method for the thickness of the multi-layer shell of the blade of the present application also has the above-mentioned beneficial effects, and also includes adopting a non-contact measurement method, by setting a reference rod on the blade wax mold, scanning the initial blade model; then after each layer of the shell is dried, scanning the blade wax mold with the reference rod in the same state, so as to obtain a three-dimensional model with a multi-layer shell surface, and finally realize the thickness measurement of each layer of the shell at different positions of the blade. This method does not rely on the skill level of the operator, and multiple measurements before and after have a unified reference benchmark, which is very convenient to operate and has high measurement accuracy.

[0037] Of course, any product implementing this application does not necessarily need to achieve all the advantages described above at the same time. In addition to the purposes, features and advantages described above, this application also has other purposes, features and advantages. The following will further describe this application in detail with reference to the figures. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0039] Figure 1 is a schematic diagram of a blade wax model of a preferred embodiment of the present application;

[0040] Figure 2 It is a schematic diagram of the original wax model’s dimensions;

[0041] Figure 3 It is a schematic diagram of a three-dimensional model that contains both the wax model shape and a layer of mold shell;

[0042] Figure 4 is a schematic diagram of the root section wall thickness measurement result of the preferred embodiment of the present application;

[0043] Figure 5 is a schematic diagram of the wall thickness measurement results of the blade tip section of the preferred embodiment of the present application;

[0044] Figure 6 is a schematic diagram of a mounting platform of a preferred embodiment of the present application;

[0045] Figure 7 is a structural schematic diagram of a push rod assembly in a preferred embodiment of the present application;

[0046] Figure 8 It is a schematic diagram of the installation of the limiting plate assembly of the preferred embodiment of the present application;

[0047] Fig. 9 It is a schematic diagram of the installation of the gear pair assembly of the preferred embodiment of the present application;

[0048] Legend: 100, blade wax model; 101, wax model reference point; 200, reference rod; 201, reference groove; 202, bearing; 203, driven wheel; 1, mounting table; 11, limit groove; 12, mounting hole; 2, spray box; 3, limit plate assembly; 31, first limit plate; 32, second limit plate; 4, push rod assembly; 41, push rod; 42, rotating part; 43, handwheel; 44, support plate; 5, motor; 6, driving wheel. DETAILED DESCRIPTION

[0049] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings, but the present application can be implemented in a variety of different ways defined and covered below.

[0050] Figure 1 is a schematic diagram of a blade wax model of a preferred embodiment of the present application; Figure 2 It is a schematic diagram of the original wax model’s dimensions; Figure 3 It is a schematic diagram of a three-dimensional model that contains both the wax model shape and a layer of mold shell; Figure 4 is a schematic diagram of the root section wall thickness measurement result of the preferred embodiment of the present application; Figure 5 is a schematic diagram of the wall thickness measurement results of the blade tip section of the preferred embodiment of the present application; Figure 6 is a schematic diagram of a mounting platform of a preferred embodiment of the present application; Figure 7 is a structural schematic diagram of a push rod assembly in a preferred embodiment of the present application; Figure 8 It is a schematic diagram of the installation of the limiting plate assembly of the preferred embodiment of the present application; Fig. 9 It is a schematic diagram of the installation of the gear pair assembly of the preferred embodiment of the present application.

[0051] A blade multi-layer mold shell thickness non-destructive measuring device is used to clamp a blade wax mold 100 and spray refractory slurry and refractory sand on the blade wax mold 100 through a spray gun to form a mold shell on its surface. The blade multi-layer mold shell thickness non-destructive measuring device includes a reference rod 200, a mounting table 1, a spray box 2, a limit plate assembly 3, a push rod assembly 4, a gear pair assembly and a motor 5:

[0052] The reference rod 200 is used to be connected to the tenon riser of the blade wax model 100. A plurality of reference grooves 201 are provided at intervals on the reference rod 200. The reference grooves 201 are used to stick sticker-like reference points. Bearings 202 are provided at intervals on the reference rod 200.

[0053] The spray box 2 is arranged beside the mounting platform 1. A limiting groove 11 is provided on the top of the mounting platform 1. The limiting groove 11 is used to limit the reference rod 200 and the bearing 202 and to allow the blade wax mold 100 to be rotatably suspended in the spray box 2. The limiting plate assemblies 3 are arranged on both sides of the limiting groove 11. The push rod assemblies 4 are arranged in pairs on both sides of the limiting groove 11. The limiting plate assemblies 3 on both sides are respectively connected to the push rod assemblies 4 on both sides. The push rod assemblies 4 on both sides are used to push the limiting plate assemblies 3 on both sides to close to clamp the bearing 202 to limit, or separate to loosen the limit of the bearing 202.

[0054] A mounting hole 12 is provided on the side wall of the mounting platform 1 away from the spray box 2. The motor 5 is arranged in the mounting hole 12 and drives the reference rod 200 and the blade wax mold 100 to rotate through the gear pair assembly, and then the refractory slurry and refractory sand are sprayed on the blade wax mold 100 during the rotation through the spray gun.

[0055] In some embodiments, the reference rod 200 may be connected to the blade wax model 100 by welding.

[0056] The present application provides a non-destructive measurement device for the thickness of a blade multi-layer mold shell, by connecting a reference rod 200 to a blade wax mold 100. Reference grooves 201 are spaced apart on the reference rod 200 to facilitate the pasting of sticker-like reference reference points, so as to serve as reference points for scanning measurement. The spaced apart reference grooves 201 are beneficial to improving the accuracy of each pasting of the reference reference points and preventing the sticker-like reference reference points from loosening and deviating. At the same time, the reference rod 200 is limited by the limiting groove 11 of the mounting table 1, and the blade wax mold 100 is suspended in the spray box 2, and the outer ring of the bearing 202 on the reference rod 200 is clamped and limited by the push rod assembly 4 and the limiting plate assembly 3, and the motor 5 is used to drive the reference rod 200 and the blade wax mold 100 to rotate through the gear pair. At this time, the operator sprays the blade wax mold 100 through the spray gun, reducing the shaking or vibration caused by manual holding of the blade wax mold 100, effectively ensuring the uniformity of the slurry coating, avoiding affecting the solidification sequence of the casting, and ensuring the metallurgical quality of the casting.

[0057] Preferably, please refer to Figure 6 , 7 As shown in , 8, the limit plate assembly 3 includes a first limit plate 31 and a second limit plate 32 which are spaced apart along the length direction of the limit groove 11. Two first limit plates 31 and two second limit plates 32 are provided. The two first limit plates 31 are respectively arranged on both sides of the limit groove 11 and are respectively connected to the push rod assemblies 4 on both sides. The two second limit plates 32 are respectively arranged on both sides of the limit groove 11 and are respectively connected to the push rod assemblies 4 on both sides.

[0058] Specifically, the push rod assembly 4 includes a push rod 41, a rotating member 42 and a support plate 44. The push rod 41 is used to be connected to the first limit plate 31 and the second limit plate 32 on one side of the limit groove 11 at the same time. The support plate 44 is arranged on the top of the mounting platform 1 and is spaced apart from the push rod 41. A connecting screw hole is provided on the support plate 44. The rotating member 42 is used to cooperate with the connecting screw hole threadably. The first end of the rotating member 42 is used to connect to a preset connecting bearing on the push rod 41. The rotating member 42 is used to drive the push rod 41 to perform a translational movement close to or away from the limit groove 11 during the process of screwing in or out of the connecting screw hole, thereby driving the first limit plate 31 and the second limit plate 32 on both sides to close and tighten the outer ring of the bearing 202 or separate to loosen the limit on the bearing 202.

[0059] It can be understood that the first limit plate 31 and the second limit plate 32 are both arranged in pairs, and the paired first limit plates 31 and the second limit plates 32 are arranged at intervals along the length direction of the limit groove 11, and can respectively clamp and limit the bearings 202 arranged at intervals on the reference rod 200. The first limit plate 31 and the second limit plate 32 on the same side of the limit groove 11 are connected to the push rod 41 at the same time, and the push rod 41 is connected to the first end of the rotating member 42 through the connecting bearing, and the rotating member 42 is penetrated on the support plate 44 and connected to the support plate 44 by threads. Then, the push rod 41 can be driven to move horizontally back and forth by rotating the rotating member 42, and then the first limit plates 31 and the second limit plates 32 on both sides are driven to close or separate by the push rod 41 at the same time, so as to achieve the compression or loosening of the outer ring of the bearing 202, and facilitate the disassembly and assembly of the reference rod 200 and the blade wax mold 100.

[0060] It should be noted that the rotating member 42 is a screw, which can be connected to the support plate 44 through threads.

[0061] Optionally, see Figure 7 As shown, a hand wheel 43 is provided at the second end of the rotating member 42 .

[0062] It is understandable that the operator can easily drive the rotating member 42 to rotate by turning the hand wheel 43, which can improve the convenience of operation.

[0063] Preferably, please refer to Figure 8 , 9 As shown, the gear pair assembly includes a driving wheel 6 and a driven wheel 203. The driving wheel 6 is connected to the output shaft of the motor 5. The driven wheel 203 is arranged at the tail end of the reference rod 200. The driving wheel 6 is used to mesh with the driven wheel 203 and drive the driven wheel 203 to rotate.

[0064] It is understandable that the motor 5 drives the driving wheel 6 to rotate, and then drives the driven wheel 203 to rotate, so as to realize the rotation of the reference rod 200 and the blade wax model 100, facilitate the use of a spray gun to spray the blade wax model 100, and help improve the uniformity of the slurry.

[0065] Preferably, please refer to Figure 7 As shown, the bearings 202 are disposed on both sides of the reference rod 200 and are disposed away from the reference groove 201 .

[0066] It is understandable that the reference groove 201 is used to stick a reference point so as to serve as a measurement reference in the subsequent measurement process, so the bearing 202 needs to be arranged away from the reference groove 201.

[0067] Preferably, please refer to Figure 6 As shown, the top of the spray box 2 is open, the interior of the spray box 2 is used to hold clean water, and a drainage port is provided at the bottom of the spray box 2.

[0068] It is understandable that the spray box 2 can play a shielding and protective role during the spraying process. The residues during the spraying process can fall into the clean water to avoid the residues condensing in the spray box 2, thereby reducing the workload of cleaning.

[0069] According to another aspect of the present application, a method for non-destructive measurement of the thickness of a blade multi-layer mold shell is provided, using the above-mentioned non-destructive measurement device for the thickness of a blade multi-layer mold shell, which comprises the following steps:

[0070] S100, connecting the reference rod 200 to the tenon riser of the blade wax mold 100, and pasting the reference point in the reference groove 201;

[0071] S200, scanning the blade wax model 100 using a blue light scanner, and obtaining the original wax model shape and size model on the ATOS software;

[0072] S300, wrapping the reference rod 200 with adhesive tape;

[0073] S400, spraying refractory slurry and refractory sand on the blade wax mold 100 with a spray gun, and leaving the blade wax mold 100 coated with the refractory slurry and refractory sand to stand and dry;

[0074] S500, removing the tape wrapped on the reference rod 200, scanning the blade wax model 100 for the second time using a blue light scanner, and fitting the second scanning result with the scanning result in step S200 on the ATOS software through the precise reference points on the reference rod 200 to obtain a three-dimensional model containing both the wax model shape and a layer of mold shell;

[0075] S600, wrap the reference rod 200 again with adhesive tape, spray a second layer of refractory slurry and refractory sand on the blade wax mold 100 with a spray gun, and let it stand and dry;

[0076] S700, removing the tape wrapped on the reference rod 200, scanning the blade wax model 100 for the third time using a blue light scanner, and fitting the third scanning result to the first two scanning results using the reference reference points on the reference rod 200 on the ATOS software to obtain a three-dimensional model containing the wax model shape, the first layer mold shell, and the second layer mold shell;

[0077] S800, and so on, to obtain a three-dimensional model with a multi-layer mold shell surface for measuring and calculating the thickness of each layer of the mold shell at different positions of the blade.

[0078] Preferably, in step S300 and step S600, when the reference rod 200 is wrapped with tape, the tape needs to cover and shield the reference reference point, while the tape does not cover the blade wax mold 100. When the blade wax mold 100 needs to be sprayed, the sticker-like reference reference point can be shielded and protected by tape to prevent the slurry from being sprayed onto the reference reference point and affecting subsequent measurements. Optionally, in step S800, the thickness results of each layer of the mold shell at different positions of the blade are obtained using the three-dimensional model processing software Geomagic. The use of conventional three-dimensional model processing software is conducive to expanding the adaptability of this method.

[0079] The non-destructive measurement method for the thickness of the multi-layered shell of the blade of the present application also has the above-mentioned beneficial effects, and also includes adopting a non-contact measurement method, by setting a reference rod 200 on the blade wax mold 100, scanning the initial blade model; then after each layer of the shell is dried, scanning the blade wax mold 100 with the reference rod 200 in the same state, thereby obtaining a three-dimensional model with a multi-layered shell surface, and finally realizing the thickness measurement of each layer of the shell at different positions of the blade. This method does not rely on the skill level of the operator, and multiple measurements before and after have a unified reference benchmark, which is very convenient to operate and has high measurement accuracy.

[0080] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0081] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection of this application.

Claims

1. A non-destructive measuring device for the thickness of a blade multi-layer mold shell, used for clamping a blade wax mold (100) and spraying refractory slurry and refractory sand on the blade wax mold (100) through a spray gun to form a mold shell on its surface, characterized in that: The blade multi-layer shell thickness non-destructive measurement device comprises a reference rod (200), a mounting platform (1), a spray box (2), a limit plate assembly (3), a push rod assembly (4), a gear pair assembly and a motor (5): The reference rod (200) is used to be connected to the tenon riser of the blade wax model (100); a plurality of reference grooves (201) are provided at intervals on the reference rod (200); the reference grooves (201) are used to stick sticker-like reference points; and bearings (202) are provided at intervals on the reference rod (200); The spray box (2) is arranged beside the mounting platform (1). A limiting groove (11) is provided on the top of the mounting platform (1). The limiting groove (11) is used to limit the reference rod (200) and the bearing (202) and to allow the blade wax mold (100) to be rotatably suspended in the spray box (2). The limiting plate assemblies (3) are arranged on both sides of the limiting groove (11). The push rod assemblies (4) are arranged in pairs on both sides of the limiting groove (11). The limiting plate assemblies (3) on both sides are respectively connected to the push rod assemblies (4) on both sides. The push rod assemblies (4) on both sides are used to push the limiting plate assemblies (3) on both sides to close together to clamp the bearing (202) to limit, or to separate to loosen the limit on the bearing (202). A mounting hole (12) is provided on a side wall of the mounting platform (1) away from the spray box (2). The motor (5) is arranged in the mounting hole (12) and drives the reference rod (200) and the blade wax model (100) to rotate through a gear pair assembly, and then sprays refractory slurry and refractory sand on the blade wax model (100) during the rotation process through a spray gun.

2. A non-destructive measuring device for blade multi-layer shell thickness according to claim 1, characterized in that: The limiting plate assembly (3) comprises a first limiting plate (31) and a second limiting plate (32) which are arranged at intervals along the length direction of the limiting groove (11); the first limiting plate (31) and the second limiting plate (32) are each provided with two pieces; the two first limiting plates (31) are respectively arranged on both sides of the limiting groove (11) and are respectively connected to the push rod assemblies (4) on both sides; the two second limiting plates (32) are respectively arranged on both sides of the limiting groove (11) and are respectively connected to the push rod assemblies (4) on both sides.

3. The non-destructive measuring device for blade multi-layer shell thickness according to claim 2, characterized in that: The push rod assembly (4) comprises a push rod (41), a rotating member (42) and a support plate (44), wherein the push rod (41) is used to simultaneously connect with a first limiting plate (31) and a second limiting plate (32) on one side of the limiting groove (11), the support plate (44) is arranged on the top of the mounting platform (1) and is spaced apart from the push rod (41), a connecting screw hole is arranged on the support plate (44), the rotating member (42) is used to threadably cooperate with the connecting screw hole, the first end of the rotating member (42) is used to connect with a preset connecting bearing on the push rod (41), the rotating member (42) is used to drive the push rod (41) to perform a translational movement close to or away from the limiting groove (11) during the process of screwing in or out of the connecting screw hole, thereby driving the first limiting plate (31) and the second limiting plate (32) on both sides to close and press the outer ring of the bearing (202) or to separate to loosen the limiting of the bearing (202).

4. A non-destructive measuring device for blade multi-layer shell thickness according to claim 3, characterized in that: A hand wheel (43) is provided at the second end of the rotating member (42).

5. The non-destructive measuring device for blade multi-layer shell thickness according to claim 1, characterized in that: The gear pair assembly comprises a driving wheel (6) and a driven wheel (203), wherein the driving wheel (6) is connected to the output shaft of the motor (5), and the driven wheel (203) is arranged at the tail end of the reference rod (200), and the driving wheel (6) is used to mesh with the driven wheel (203) and drive the driven wheel (203) to rotate.

6. The non-destructive measuring device for blade multi-layer shell thickness according to claim 1, characterized in that: The bearings (202) are arranged on both sides of the reference rod (200) and are arranged away from the reference groove (201).

7. The non-destructive measuring device for blade multi-layer shell thickness according to claim 1, characterized in that: The top of the spray box (2) is open, the interior of the spray box (2) is used to contain clean water, and a drainage outlet is provided at the bottom of the spray box (2).

8. A non-destructive measurement method for the thickness of a blade multi-layer shell, characterized in that: Using the blade multi-layer shell thickness non-destructive measurement device as described in any one of claims 1 to 6, the blade multi-layer shell thickness non-destructive measurement method comprises the following steps: S100, connecting the reference rod (200) to the tenon riser of the blade wax mold (100), and pasting the reference point in the reference groove (201); S200, scanning the blade wax model (100) using a blue light scanner, and obtaining the original wax model shape and size model on ATOS software; S300, wrapping the reference rod (200) with adhesive tape; S400, spraying refractory slurry and refractory sand on the blade wax model (100) using a spray gun, and leaving the blade wax model (100) coated with the refractory slurry and refractory sand to stand and dry; S500, removing the tape wrapped on the reference rod (200), scanning the blade wax model (100) for a second time using a blue light scanner, and fitting the second scanning result with the scanning result in step S200 on the ATOS software through the precise reference points on the reference rod (200), to obtain a three-dimensional model containing both the wax model shape and a layer of mold shell; S600, wrap the reference rod (200) again with adhesive tape, spray a second layer of refractory slurry and refractory sand on the blade wax mold (100) with a spray gun, and let it stand and dry; S700, removing the tape wrapped on the reference rod (200), scanning the blade wax model (100) for the third time using a blue light scanner, and fitting the third scanning result to the first two scanning results using the reference reference points on the reference rod (200) on the ATOS software to obtain a three-dimensional model containing the wax model shape, the first layer mold shell, and the second layer mold shell; S800, and so on, to obtain a three-dimensional model with a multi-layer mold shell surface for measuring and calculating the thickness of each layer of the mold shell at different positions of the blade.

9. The method for non-destructive measurement of blade multi-layer shell thickness according to claim 7, characterized in that: In step S300 and step S600, when the reference rod (200) is wrapped with adhesive tape, the adhesive tape needs to cover and shield the reference point, while the adhesive tape does not cover the blade wax model (100).

10. A non-destructive measurement method for blade multi-layer shell thickness according to claim 7, characterized in that: In step S800, the thickness of each layer of the mold shell at different positions of the blade is obtained by using the three-dimensional model processing software Geomagic.

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