A method, system, device and medium for controlling preparation of a neodymium iron boron magnet

Abstract

The application discloses a neodymium-iron-boron magnet preparation control method, system, device and medium, including the following steps: based on the special mold control to complete the pre-compaction operation of neodymium-iron-boron magnetic powder to form the first embryo; based on the side angle of the cylinder body mold to obtain the blind hole depth image after extracting the core rod; identify whether the blind hole has the first defect feature; if yes, control to complete the supplementary compaction operation of the blind hole; if not, control to complete the hole forming operation of the first embryo to form the second embryo; the second embryo has an inverted cone hole and a spherical convex; based on the plan view angle of the cylinder body mold to obtain the laser scanning three-dimensional image of the inverted cone hole and the spherical convex; identify whether the spherical convex has the second defect feature; if yes, control to complete the supplementary compaction operation of the spherical convex; if not, control to complete the heat deformation treatment of the second embryo to obtain the neodymium-iron-boron magnet, and the application has the advantages of improving the defect detection accuracy of the magnet preparation process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial production control, and particularly relates to a neodymium-iron-boron magnet preparation control method, system, device and medium. BACKGROUND

[0002] At present, the preparation process of the neodymium-iron-boron magnet includes preparing the magnetic powder, cold pressing and hot pressing the prepared magnetic powder, and finally performing the hot deformation treatment combined with the corresponding mold to obtain the neodymium-iron-boron magnet with the corresponding shape structure. According to different application fields and performance requirements, the shape structure of the neodymium-iron-boron magnet is different. At present, a special-shaped neodymium-iron-boron magnet is prepared. The whole neodymium-iron-boron magnet is columnar, and a plurality of blind holes are uniformly distributed on the side wall of the neodymium-iron-boron magnet. The top of the neodymium-iron-boron magnet has an inverted conical hole, and the bottom of the inverted conical hole has a spherical protrusion. In the preparation process, due to the special structure, defect detection needs to be performed at each key node of forming, such as the depth of the blind hole and the compaction degree of the spherical protrusion, so as to control the forming quality requirements. At present, the process progress is mainly controlled by manual detection, and the detection accuracy and efficiency are relatively low, which affects the process preparation progress. SUMMARY

[0003] The main purpose of the present application is to provide a neodymium-iron-boron magnet preparation control method, system, device and medium, which aims to solve the technical problem of low defect detection accuracy of the existing neodymium-iron-boron magnet preparation control method.

[0004] To achieve the above-mentioned purpose, the present application provides a neodymium-iron-boron magnet preparation control method, which comprises the following steps:

[0005] The pre-compaction operation of the neodymium-iron-boron magnetic powder is controlled based on a special mold to form a first embryo; wherein the special mold includes a barrel mold with a cavity, a plurality of core rods are movably and penetratively arranged on the side wall of the barrel mold, and the core rods extend into the cavity and are used for forming blind holes on the side wall of the first embryo;

[0006] The depth image of the blind hole after the core rod is extracted is obtained based on the side view angle of the barrel mold;

[0007] According to the blind hole depth image, whether the blind hole has a first defect feature is identified; wherein the first defect feature is a recess feature formed by the un-compaction of the hole end face of the blind hole;

[0008] If yes, the supplementary compaction operation of the blind hole after the core rod is installed is controlled, and the depth image of the blind hole after the core rod is extracted is obtained based on the view angle opposite to the side wall of the barrel mold; if no, the hole forming operation of the first embryo is controlled to form a second embryo; wherein the second embryo has an inverted conical hole at the top, and the bottom of the inverted conical hole has a spherical protrusion;

[0009] The laser scanning three-dimensional image of the inverted conical hole and the spherical protrusion is obtained based on the top view angle of the barrel mold;

[0010] According to the laser scanning three-dimensional image, whether the spherical protrusion has a second defect feature is identified; wherein the second defect feature is a concave feature formed by the non-compaction of the surface of the spherical protrusion;

[0011] If yes, the supplementary compaction operation on the spherical protrusion is completed, and the laser scanning three-dimensional image of the inverted conical hole and the spherical protrusion is obtained based on the top view angle of the cylinder mold; if no, the thermal deformation processing of the second embryo is completed to obtain the Nd-Fe-B magnet.

[0012] Optionally, according to the blind hole depth image, whether the blind hole has a first defect feature is identified, comprising:

[0013] According to the blind hole depth image, the depth values of a plurality of pixel points corresponding to the hole end face of the blind hole are obtained;

[0014] The maximum value in the depth values of the plurality of pixel points is obtained;

[0015] It is judged whether the maximum value is greater than a preset first depth threshold value, if yes, it is identified that the blind hole has the first defect feature, if no, target pixel points with depth values greater than a preset second depth threshold value are screened out; wherein the second depth threshold value is less than the first depth threshold value;

[0016] The average value h of the depth values corresponding to the plurality of target pixel points and the number n of the plurality of target pixel points are obtained;

[0017] A first defect value Q is obtained; wherein Q=n h;

[0018] It is judged whether the first defect value Q is greater than a preset defect threshold value, if yes, it is identified that the blind hole has the first defect feature, if no, it is identified that the blind hole does not have the first defect feature.

[0019] Optionally, according to the laser scanning three-dimensional image, whether the spherical protrusion has a second defect feature is identified, comprising:

[0020] According to the laser scanning three-dimensional image, a three-dimensional coordinate system is constructed; wherein the coordinate origin of the three-dimensional coordinate system is located on the axial line of the spherical protrusion;

[0021] Based on the three-dimensional coordinate system, the vertex coordinate of the spherical protrusion is obtained;

[0022] The vertex coordinate is compared with a theoretical coordinate to obtain a z-direction coordinate difference value; wherein the theoretical coordinate is the coordinate position of the vertex of the spherical protrusion when the vertex does not have a depression;

[0023] determining whether the z-coordinate difference is greater than a preset first threshold value, if yes, identifying that the spherical convex has the second defect feature, if no, obtaining reference coordinates of the inner wall of the inverted conical hole at different positions; wherein the reference coordinates are lower than the vertex coordinates;

[0024] obtaining associated coordinates corresponding to the spherical convex surface and the reference coordinates; wherein the z-coordinate values of the associated coordinates and the reference coordinates are equal, and the line connecting the associated coordinates and the reference coordinates passes through the axis of the spherical convex;

[0025] obtaining a coordinate distance value between the associated coordinates and the reference coordinates;

[0026] determining whether the coordinate distance value is greater than a preset second threshold value, if yes, identifying that the spherical convex has the second defect feature, if no, identifying that the spherical convex does not have the second defect feature.

[0027] Optionally, obtaining the reference coordinates of the inner wall of the inverted conical hole at different positions comprises:

[0028] selecting a plurality of discrete first reference coordinates around a circle of a first height position of the inner wall of the inverted conical hole; wherein the first height position is lower than the vertex coordinates of the spherical convex;

[0029] if the coordinate distance value between the first reference coordinates and the corresponding associated coordinates is less than or equal to the corresponding second threshold value, selecting a plurality of discrete second reference coordinates around a circle of a second height position of the inner wall of the inverted conical hole; wherein the second height position is lower than the first height position;

[0030] if the coordinate distance value between the second reference coordinates and the corresponding associated coordinates is less than or equal to the corresponding second threshold value, selecting a plurality of discrete third reference coordinates around a circle of a third height position of the inner wall of the inverted conical hole; wherein the third height position is lower than the second height position;

[0031] until a termination condition is reached; wherein the termination condition is that the current reference coordinates reach a preset lowest height position or the coordinate distance value between the current reference coordinates and the corresponding associated coordinates is greater than the corresponding second threshold value.

[0032] Optionally, the control includes a supplementary compaction operation on the blind hole after the installation of the mandrel is completed, comprising:

[0033] controlling the first hydraulic member to press into the first embryo to form a filling hole in the middle of the first embryo; wherein the first hydraulic member includes a first hydraulic plate, the bottom of the first hydraulic plate is connected with a core column for forming the filling hole, and the bottom of the filling hole is lower than the position of the blind hole;

[0034] controlling to fill the filling hole with neodymium-iron-boron magnetic powder, and controlling the second hydraulic plate to perform compaction treatment on the filled first embryo to complete the supplementary compaction operation on the blind hole.

[0035] Optionally, the control completes the hole making operation on the first embryo to form a second embryo, comprising:

[0036] The control presses the second hydraulic part into the first embryo to form the second embryo; wherein the second hydraulic part comprises a third hydraulic plate, the third hydraulic plate is connected with a reverse tapered column at the bottom, and the reverse tapered column is provided with an inner groove for forming a spherical convex at the bottom.

[0037] Optionally, the control completes the supplementary compaction operation on the spherical convex, comprising:

[0038] The control adds a corresponding amount of Nd-Fe-B magnetic powder to the spherical convex area;

[0039] The control presses the second hydraulic part into the second embryo to complete the supplementary compaction operation on the spherical convex.

[0040] To achieve the above object, the application further provides a Nd-Fe-B magnet preparation control system, comprising:

[0041] The first control module is used for controlling the pre-compaction operation on the Nd-Fe-B magnetic powder based on the special mold to form a first embryo; wherein the special mold comprises a barrel mold with a cavity, a plurality of core rods are movably arranged through the side wall of the barrel mold, and the core rods extend into the cavity and are used for forming blind holes on the side wall of the first embryo;

[0042] The first image acquisition module is used for acquiring a blind hole depth image after the core rod is extracted based on the side view angle of the barrel mold;

[0043] The first defect identification module is used for identifying whether the blind hole has a first defect feature according to the blind hole depth image; wherein the first defect feature is a recess feature formed by the non-compaction of the hole end face of the blind hole;

[0044] The second control module is used for controlling the supplementary compaction operation on the blind hole after the core rod is installed, and returning to acquiring the blind hole depth image after the core rod is extracted based on the view angle opposite to the side wall of the barrel mold if yes; and controlling the hole making operation on the first embryo to form a second embryo if no; wherein the second embryo has a reverse tapered hole at the top, and the reverse tapered hole has a spherical convex at the bottom;

[0045] The second image acquisition module is used for acquiring a laser scanning three-dimensional image of the reverse tapered hole and the spherical convex based on the top view angle of the barrel mold;

[0046] The second defect identification module is used for identifying whether the spherical convex has a second defect feature according to the laser scanning three-dimensional image; wherein the second defect feature is a recess feature formed by the non-compaction of the surface of the spherical convex;

[0047] The third control module is configured to: if yes, control to complete a supplementary compaction operation on the spherical protrusion, and return to acquiring the laser scanning three-dimensional image of the inverted conical hole and the spherical protrusion based on the top view of the barrel mold; and if no, control to complete the heat deformation processing of the second embryo to obtain the Nd-Fe-B magnet.

[0048] To achieve the above object, the application further provides a computer device, which comprises a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the method.

[0049] To achieve the above object, the application further provides a computer readable storage medium, which stores a computer program, and the processor executes the computer program to realize the method.

[0050] The application can achieve the following beneficial effects:

[0051] The application first controls to complete the pre-compaction operation on the Nd-Fe-B magnetic powder based on the special mold to form the first embryo, and the core rod in the special mold can be detached and extracted, so that the depth image of the blind hole after the core rod is extracted can be directly acquired based on the side view of the barrel mold subsequently, without the need to take out the first embryo, thereby reducing the risk of secondary damage to the first embryo in the taking-out process. The depth image of the blind hole can include the hole end face depth value of the blind hole. If there is a recess feature formed by the un-compacted hole end face of the blind hole, there is a significant difference between the corresponding depth value and the theoretical value, so that the first defect feature can be identified based on this. If the first defect feature is identified, the supplementary compaction operation on the blind hole after the core rod is installed is controlled to be completed, and then it is continuously detected whether the first defect feature exists until the first defect feature disappears. Then, the hole forming operation on the first embryo is controlled to be completed to form the second embryo. Since the second embryo has the inverted conical hole at the top and the spherical protrusion at the bottom of the inverted conical hole, the internal structure is relatively complex, the laser scanning three-dimensional image of the inverted conical hole and the spherical protrusion is acquired based on the top view of the barrel mold, so that the three-dimensional appearance of the inverted conical hole and the spherical protrusion can be reconstructed. That is, whether the spherical protrusion has the recess feature formed by the un-compacted surface, i.e., the second defect feature, can be identified according to the laser scanning three-dimensional image. If yes, the supplementary compaction operation on the spherical protrusion is controlled to be completed, and it is detected again until the second defect feature disappears. Finally, the heat deformation processing of the second embryo is controlled to be completed to obtain the Nd-Fe-B magnet. This process uses machine vision recognition and laser scanning technology to detect the corresponding defect conditions at two key nodes of the blind hole and the inverted conical hole, respectively, thereby improving the defect detection accuracy and being beneficial to the Nd-Fe-B magnet with high quality. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. In all the drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, the elements or parts are not necessarily drawn according to the actual proportions.

[0053] Figure 1 A flowchart of a method for preparing and controlling a neodymium-iron-boron magnet according to an embodiment of the present application;

[0054] Figure 2 A structural diagram of a neodymium-iron-boron magnet according to an embodiment of the present application;

[0055] Figure 3 A structural diagram of a neodymium-iron-boron magnet according to an embodiment of the present application;

[0056] Figure 4 A structural diagram of a neodymium-iron-boron magnet according to an embodiment of the present application;

[0057] Figure 5 A structural diagram of a neodymium-iron-boron magnet according to an embodiment of the present application;

[0058] Figure 6 A structural diagram of a neodymium-iron-boron magnet according to an embodiment of the present application;

[0059] Figure 7 A structural diagram of a neodymium-iron-boron magnet according to an embodiment of the present application;

[0060] Figure 8 A structural diagram of a neodymium-iron-boron magnet according to an embodiment of the present application;

[0061] Figure 9 A structural diagram of a neodymium-iron-boron magnet according to an embodiment of the present application;

[0062] Figure 10 A structural diagram of a neodymium-iron-boron magnet according to an embodiment of the present application; Figure 9 A structural diagram of a neodymium-iron-boron magnet according to an embodiment of the present application;

[0063] Reference signs:

[0064] 110 - Nd-Fe-B magnet, 111 - blind hole, 112 - inverted conical hole, 113 - spherical protrusion, 120 - special mold, 121 - barrel mold, 122 - mandrel, 130 - first embryo, 131 - filling hole, 140 - first hydraulic part, 141 - first hydraulic plate, 142 - core column, 150 - second hydraulic plate, 160 - second hydraulic part, 161 - third hydraulic plate, 162 - inverted conical column, 163 - inner groove, 170 - second embryo.

[0065] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0066] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0067] It should be noted that if the present application has a description of "first", "second" and the like, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0068] Embodiment 1:

[0069] Referring to Figures 1-10 The present embodiment provides a Nd-Fe-B magnet preparation control method, comprising the following steps:

[0070] Based on the special mold 120, the pre-compaction operation of the Nd-Fe-B magnetic powder is controlled to form the first embryo 130; wherein the special mold 120 comprises a barrel mold 121 with a cavity, a plurality of mandrels 122 are movably arranged through the side wall of the barrel mold 121, and the mandrels 122 extend into the cavity and are used to form blind holes 111 on the side wall of the first embryo 130;

[0071] Based on the side view angle of the barrel mold 121, a blind hole depth image after the mandrel 122 is extracted is obtained;

[0072] According to the blind hole depth image, it is identified whether the first defect feature exists in the blind hole 111; wherein the first defect feature is a recessed feature formed by the non-compaction of the hole end face of the blind hole 111;

[0073] If yes, the supplementary compaction operation on the blind hole 111 after the installation of the core rod 122 is controlled, and the process returns to the acquisition of the blind hole depth image after the extraction of the core rod 122 based on the perspective of the side wall of the cylinder mold 121; if no, the hole forming operation on the first blank 130 is controlled to form the second blank 170; wherein the second blank 170 has the inverted conical hole 112 at the top, and the spherical protrusion 113 is at the inner bottom of the inverted conical hole 112;

[0074] The laser scanning three-dimensional image of the inverted conical hole 112 and the spherical protrusion 113 is acquired based on the top perspective of the cylinder mold 121;

[0075] According to the laser scanning three-dimensional image, it is identified whether the second defect feature exists in the spherical protrusion 113; wherein the second defect feature is a recessed feature formed by the non-compaction of the surface of the spherical protrusion 113;

[0076] If yes, the supplementary compaction operation on the spherical protrusion 113 is controlled, and the process returns to the acquisition of the laser scanning three-dimensional image of the inverted conical hole 112 and the spherical protrusion 113 based on the top perspective of the cylinder mold 121; if no, the heat deformation treatment on the second blank 170 is controlled to obtain the Nd-Fe-B magnet 110.

[0077] In the embodiment, the pre-compaction operation on the Nd-Fe-B magnetic powder is first controlled based on the special mold 120 to form the first body 130. Since the first body 130 bears axial pressure and small radial pressure when the Nd-Fe-B magnetic powder is pressed into shape, the pressure on the end of the mandrel 122 is low, which makes it difficult for the Nd-Fe-B magnetic powder at the end of the mandrel 122 to be compacted tightly, and the hole end face of the blind hole 111 formed finally is prone to have a depression. Therefore, the mandrel 122 in the special mold 120 is disassembled and extracted, so that the blind hole depth image after the mandrel 122 is extracted can be obtained directly based on the side view of the barrel mold 121 in the subsequent process, without the need to take out the first body 130, thereby reducing the risk of secondary damage to the first body 130 in the taking-out process. The blind hole depth image can include the hole end face depth value of the blind hole 111. If there is a depression feature formed by the un-compacted hole end face of the blind hole 111, there is a significant difference between the corresponding depth value and the theoretical value, so that the first defect feature can be identified based on this. If the first defect feature is identified, the supplementary compaction operation on the blind hole 111 is controlled after the mandrel 122 is installed, and then it is continuously detected whether the first defect feature exists until the first defect feature disappears. Then the hole forming operation on the first body 130 is controlled to form the second body 170. Since the second body 170 has the inverted conical hole 112 at the top, and the spherical protrusion 113 is at the inner bottom of the inverted conical hole 112, the spherical protrusion 113 is also prone to have a depression due to the uneven pressure, and the internal structure is relatively complex. Therefore, the laser scanning three-dimensional image of the inverted conical hole 112 and the spherical protrusion 113 is obtained based on the plan view of the barrel mold 121, so that the three-dimensional appearance of the inverted conical hole 112 and the spherical protrusion 113 can be reconstructed. According to the laser scanning three-dimensional image, whether the spherical protrusion 113 has a depression feature formed by un-compacted surface, i.e., the second defect feature, can be identified. If yes, the supplementary compaction operation on the spherical protrusion 113 is controlled, and it is detected again until the second defect feature disappears. Finally, the thermal deformation processing on the second body 170 is controlled to obtain the Nd-Fe-B magnet 110. This process uses machine vision recognition and laser scanning technology to detect the corresponding defect at two key nodes, i.e., the blind hole 111 and the inverted conical hole 112, to improve the defect detection accuracy, thereby being beneficial to the Nd-Fe-B magnet 110 with high quality.

[0078] It should be noted that when the pre-compaction operation is performed, the Nd-Fe-B magnetic powder in the barrel mold 121 is pressed to a certain thickness by the second hydraulic plate 150, and then the second hydraulic plate 150 and the mandrel 122 are taken out at the same time, so that the depth image detection can be performed subsequently. Here, the mandrel 122 can be connected with the barrel mold 121 through threads, so as to be convenient for disassembly and installation, and the installation depth can be adjusted to form the blind hole 111 with different depth requirements.

[0079] As an optional implementation, according to the blind hole depth image, whether the blind hole 111 has the first defect feature is identified, including:

[0080] According to the blind hole depth image, the depth values of a plurality of pixel points corresponding to the hole end face of the blind hole 111 are obtained;

[0081] The maximum value in the depth values of the plurality of pixel points is obtained;

[0082] It is judged whether the maximum value is greater than a preset first depth threshold value, if yes, it is identified that the blind hole 111 has the first defect feature, if not, target pixel points with depth values greater than a preset second depth threshold value are screened out; wherein the second depth threshold value is less than the first depth threshold value;

[0083] The average value h of the depth values corresponding to the plurality of target pixel points and the number n of the plurality of target pixel points are obtained;

[0084] The first defect value Q is obtained; wherein Q=n h;

[0085] It is judged whether the first defect value Q is greater than a preset defect threshold value, if yes, it is identified that the blind hole 111 has the first defect feature, if not, it is identified that the blind hole 111 does not have the first defect feature.

[0086] In the embodiment, based on the blind hole depth image, the depth values of a plurality of pixel points corresponding to the hole end face of the blind hole 111 can be obtained, the maximum value in the depth values of the plurality of pixel points is identified first, and it is judged whether the maximum value is greater than a preset first depth threshold value, if yes, it is identified that the pixel point corresponding to the maximum value of the depth value and the surrounding area thereof have obvious concave conditions, at this time, it is identified that the blind hole 111 has the first defect feature, if not, in order to improve the detection accuracy, target pixel points with depth values greater than a preset second depth threshold value are further screened out, that is, the depth values of the target pixel points are between the second depth threshold value and the first depth threshold value, and then the product of the average value h of the depth values corresponding to the plurality of target pixel points and the number n of the plurality of target pixel points is output as the first defect value Q, which can quantitatively represent the defect area size of the hole end face of the blind hole 111, if greater than a preset defect threshold value, it is still identified that the blind hole 111 has the first defect feature, through double detection, the detection accuracy of the defect of the blind hole 111 can be effectively improved, and here, the detection order based on the maximum value in the depth values and the first defect value Q is because when the maximum value is detected, it can be quickly identified that when the blind hole 111 is identified to have the first defect feature based on the maximum value, the next step of detection is not needed, the data processing pressure is reduced, and the detection efficiency is improved.

[0087] As an optional implementation, according to the laser scanning three-dimensional image, whether the spherical convex 113 has the second defect feature is identified, including:

[0088] A three-dimensional coordinate system is constructed according to the laser scanning three-dimensional image; wherein the coordinate origin of the three-dimensional coordinate system is located on the axial line of the spherical protrusion 113;

[0089] Based on the three-dimensional coordinate system, the vertex coordinate of the spherical protrusion 113 is obtained;

[0090] The vertex coordinate is compared with the theoretical coordinate to obtain the z-direction coordinate difference value; wherein the theoretical coordinate is the coordinate position of the vertex of the spherical protrusion 113 when the vertex does not have a depression;

[0091] It is judged whether the z-direction coordinate difference value is greater than a preset first threshold value, if yes, it is identified that the spherical protrusion 113 has the second defect feature, and if not, the reference coordinates of the inner wall of the inverted conical hole 112 at different positions are obtained; wherein the reference coordinates are lower than the vertex coordinate;

[0092] The associated coordinates corresponding to the reference coordinates on the surface of the spherical protrusion 113 are obtained; wherein the z-direction coordinate value of the associated coordinates is equal to that of the reference coordinates, and the line connecting the associated coordinates and the reference coordinates passes through the axial line of the spherical protrusion 113;

[0093] The coordinate distance value between the associated coordinates and the reference coordinates is obtained;

[0094] It is judged whether the coordinate distance value is greater than a preset second threshold value, if yes, it is identified that the spherical protrusion 113 has the second defect feature, and if not, it is identified that the spherical protrusion 113 does not have the second defect feature.

[0095] In the embodiment, a three-dimensional coordinate system can be constructed based on the laser scanning three-dimensional image, and here the coordinate origin O of the three-dimensional coordinate system can be set at the theoretical coordinate position. Since the top of the spherical protrusion 113 has a high probability of being depressed, the vertex coordinate of the spherical protrusion 113 is first obtained, marked as H(0, 0, z0), and the z-direction coordinate difference value between the vertex coordinate and the theoretical coordinate can be calculated, which is z0. Considering the allowable error, a first threshold value is set, and when the z-direction coordinate difference value is greater than the first threshold value, it is identified that the spherical protrusion 113 has the second defect feature, otherwise, it is considered that the other surface regions of the spherical protrusion 113 can also have depressions, and since the inner wall of the inverted conical hole 112 is a slope, it is more resistant to axial pressure and therefore basically does not have a depression. Therefore, here the reference coordinates of the inner wall of the inverted conical hole 112 at different positions can be selected as reference points, and the reference coordinates are marked as (x n , y n , z n ), and each reference coordinate has a corresponding associated coordinate on the surface of the spherical protrusion 113, and the associated coordinates are marked as (x n ', y n ', z n' ), because the z coordinate values of the reference coordinates and their corresponding associated coordinates are equal, i.e. z n =z n ', so here only the coordinate distance values of the two coordinates in the horizontal direction need to be calculated, and considering the allowable error, a second threshold value is set here, and when the coordinate distance value is greater than the second threshold value, it is identified that the spherical convex 113 has the second defect feature, so in this embodiment, based on the probability of the position of the spherical convex 113 where the depression occurs, the vertex coordinates where the depression probability is relatively large are identified first, and then the associated coordinates where the depression probability is relatively small are identified, and if the vertex coordinates are identified to have the depression feature, there is no need to detect the associated coordinates in the next step, and by reasonably planning the detection order, the detection accuracy is ensured and the detection efficiency is improved.

[0096] As an optional implementation, the reference coordinates of the inner wall of the inverted conical hole 112 at different positions are obtained, including:

[0097] a plurality of discrete first reference coordinates are selected around a circle at a first height position of the inner wall of the inverted conical hole 112; wherein the first height position is lower than the vertex coordinates of the spherical convex 113;

[0098] If the coordinate distance value of the first reference coordinates and the corresponding associated coordinates is less than or equal to the corresponding second threshold value, a plurality of discrete second reference coordinates are selected around a circle at a second height position of the inner wall of the inverted conical hole 112; wherein the second height position is lower than the first height position;

[0099] If the coordinate distance value of the second reference coordinates and the corresponding associated coordinates is less than or equal to the corresponding second threshold value, a plurality of discrete third reference coordinates are selected around a circle at a third height position of the inner wall of the inverted conical hole 112; wherein the third height position is lower than the second height position;

[0100] until the end condition is reached; wherein the end condition is that the current reference coordinates reach a preset lowest height position or the coordinate distance value of the current reference coordinates and the corresponding associated coordinates is greater than the corresponding second threshold value.

[0101] In this embodiment, because the pressure directions are different, the probability of the surface of the spherical convex 113 being depressed at different height positions is different, and generally the closer to the top position, the greater the probability of depression, so when selecting the reference coordinates here, the principle of selecting from top to bottom along the different height positions of the inner wall of the inverted conical hole 112 is adopted, and different numbers of reference coordinates are selected at each height position, and because the inner diameter of the inverted conical hole 112 decreases from top to bottom, the number of selected reference coordinates corresponding to the lower positions can be smaller, for example, when a plurality of discrete first reference coordinates are selected at the first height position of the inner wall of the inverted conical hole 112, they are respectively denoted as a (x1, y1, z1), a (x2, y2, z2), a (x3, y3, z3)... a (xn y n , z n If the corresponding associated coordinates are a'(x1', y1', z1'), a'(x2', y2', z2'), a'(x3', y3', z3')...a'(x n ',y n ',z n '), calculate the coordinate distance between each first reference coordinate and its corresponding associated coordinate. If the coordinate distance is greater than the corresponding second threshold (the second threshold varies depending on the distance height), then there is no need to calculate the coordinate distance for the next height, and the second defect feature of the spherical protrusion 113 can be directly identified, thus saving detection time and improving detection efficiency. If all coordinate distances calculated at the first height position are less than the corresponding second threshold, then multiple second reference coordinates are selected along the inner wall of the inverted conical hole 112 at the second height position below the first height position, denoted as b(x1, y1, z1), b(x2, y2, z2), b(x3, y3, z3)...b(x n y n , z n If the corresponding associated coordinates are b'(x1', y1', z1'), b'(x2', y2', z2'), b'(x3', y3', z3')...b'(x n ',y n ',z n Similarly, if all coordinate distance values ​​calculated based on the second height position are less than the corresponding second threshold, then multiple third reference coordinates are selected along the inner wall of the inverted conical hole 112 based on the third height position below the second height position, and the coordinate distance values ​​are calculated again until the current reference coordinate reaches the preset minimum height position or the coordinate distance value between the current reference coordinate and the corresponding associated coordinate is greater than the corresponding second threshold. This achieves defect detection at different heights according to the probability of indentation, improving detection efficiency while ensuring detection accuracy.

[0102] It should be noted that when a reference coordinate is to be selected at the lower level, the reference coordinates of the lower level are intersected with the reference coordinates of the upper level in the radial direction of the spherical protrusion 113, thereby increasing the discreteness of the coordinate selection points and improving the detection accuracy.

[0103] As an optional implementation, the supplementary compaction operation of the blind hole 111 after the installation of the mandrel 122 is completed includes:

[0104] The first hydraulic component 140 is controlled to press into the first blank 130 to form a filling hole 131 in the middle of the first blank 130; wherein, the first hydraulic component 140 includes a first hydraulic plate 141, and the bottom of the first hydraulic plate 141 is connected to a core post 142 for forming the filling hole 131, and the bottom of the filling hole 131 is lower than the position of the blind hole 111.

[0105] The filling hole 131 is filled with neodymium iron boron magnetic powder, and the second hydraulic plate 150 is controlled to compact the first blank 130 after filling, so as to complete the supplementary compaction operation of the blind hole 111.

[0106] In this embodiment, when supplementing the compaction of the blind hole 111, the first hydraulic component 140 with the core post 142 is first pressed into the first blank 130. Since the core post 142 can extend below the height of the core rod 122, the core post 142 generates radial extrusion force on the neodymium iron boron magnetic powder in the end region of the core rod 122, so as to promote the compaction of the neodymium iron boron magnetic powder on the end of the core rod 122, thereby achieving the compaction treatment of the hole end face of the blind hole 111. At this time, after the first hydraulic component 140 is pulled out, a filling hole 131 will be formed. Then, the filling hole 131 is filled with neodymium iron boron magnetic powder, and the second hydraulic plate 150 is controlled to compact the first blank 130 after filling. Thus, the compaction treatment operation of the lateral blind hole 111 can be effectively achieved.

[0107] As an optional implementation, controlling the completion of the hole-making operation on the first preform 130 to form the second preform 170 includes:

[0108] The second hydraulic component 160 is controlled to press into the first preform 130 to form the second preform 170; wherein, the second hydraulic component 160 includes a third hydraulic plate 161, the bottom of the third hydraulic plate 161 is connected to an inverted conical column 162, and the bottom of the inverted conical column 162 is provided with an inner groove 163 for forming a spherical protrusion 113.

[0109] In this embodiment, when pressing the second blank 170, the second hydraulic component 160 with the corresponding core mold can be controlled to press into the first blank 130, thereby forming the corresponding inverted conical hole 112 and spherical protrusion 113 through the inverted conical column 162 and the inner groove 163.

[0110] As an optional implementation, controlling the completion of the supplementary compaction operation on the spherical protrusion 113 includes:

[0111] Control the addition of the corresponding amount of neodymium iron boron magnetic powder to the spherical protrusion 113 area;

[0112] The second hydraulic component 160 is controlled to align with the spherical protrusion 113 and press into the second blank 170 to complete the supplementary compaction operation of the spherical protrusion 113.

[0113] In the embodiment, when the spherical protrusion 113 is supplemented and compacted, the second hydraulic part 160 is removed, a corresponding amount of Nd-Fe-B magnetic powder is added to the area of the spherical protrusion 113, and then the second hydraulic part 160 is controlled to press into the second embryo 170 against the spherical protrusion 113. Finally, when the heat deformation process is performed, the second hydraulic part 160 is kept in the barrel mold 121, and pressure is gradually applied, so that the Nd-Fe-B magnet 110 of a corresponding size is finally formed.

[0114] Embodiment 2:

[0115] Based on the same inventive idea as the foregoing embodiments, the embodiment also provides a Nd-Fe-B magnet preparation control system, which comprises:

[0116] A first control module is configured to control the pre-compaction operation of the Nd-Fe-B magnetic powder based on the special mold 120 to form the first embryo 130. The special mold 120 comprises a barrel mold 121 with a cavity, and a plurality of core rods 122 are movably arranged through the side wall of the barrel mold 121. The core rods 122 extend into the cavity and are used to form the blind hole 111 on the side wall of the first embryo 130.

[0117] A first image acquisition module is configured to acquire the blind hole depth image after the core rod 122 is extracted based on the side view angle of the barrel mold 121.

[0118] A first defect identification module is configured to identify whether the blind hole 111 has a first defect feature according to the blind hole depth image. The first defect feature is a recess feature formed by the un-compacted hole end face of the blind hole 111.

[0119] A second control module is configured to control the supplementary compaction operation of the blind hole 111 after the core rod 122 is installed if the first defect feature exists, and return to acquire the blind hole depth image after the core rod 122 is extracted based on the view angle of the side wall of the barrel mold 121. If the first defect feature does not exist, the drilling operation of the first embryo 130 is controlled to form the second embryo 170. The second embryo 170 has a reverse tapered hole 112 at the top, and the reverse tapered hole 112 has a spherical protrusion 113 at the inner bottom.

[0120] A second image acquisition module is configured to acquire the laser scanning three-dimensional image of the reverse tapered hole 112 and the spherical protrusion 113 based on the top view angle of the barrel mold 121.

[0121] A second defect identification module is configured to identify whether the spherical protrusion 113 has a second defect feature according to the laser scanning three-dimensional image. The second defect feature is a recess feature formed by the un-compacted surface of the spherical protrusion 113.

[0122] The third control module is configured to: if yes, control to complete the supplementary compaction operation on the spherical protrusion 113, and return to acquire the laser scanning three-dimensional image of the inverted conical hole 112 and the spherical protrusion 113 based on the top view angle of the barrel mold 121; and if no, control to complete the heat deformation processing on the second embryo 170 to obtain the neodymium-iron-boron magnet 110.

[0123] The related explanations and examples of the modules in the system of the embodiment can refer to the method of the foregoing embodiment, and will not be described here.

[0124] Embodiment 3

[0125] Based on the same inventive concept as the foregoing embodiments, the embodiment provides a computer device, which comprises a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the method.

[0126] Embodiment 4

[0127] Based on the same inventive concept as the foregoing embodiments, the embodiment provides a computer readable storage medium, which stores a computer program, and a processor executes the computer program to realize the method.

[0128] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method of controlling the production of a neodymium-iron-boron magnet, characterized by, The method comprises the following steps: controlling to complete a pre-compaction operation on the Nd-Fe-B magnetic powder based on a special mold to form a first body; wherein the special mold comprises a barrel mold having a cavity, a plurality of core rods are movably arranged through the side wall of the barrel mold, and the core rods extend into the cavity and are used to form blind holes in the side wall of the first body; obtaining a blind hole depth image after the core rods are extracted based on a side view angle of the barrel mold; According to the blind hole depth image, whether the blind hole has a first defect feature is identified; wherein the first defect feature is a recessed feature formed by the hole end face of the blind hole not being compacted; comprising: according to the blind hole depth image, the depth values of a plurality of pixel points corresponding to the hole end face of the blind hole are obtained; the maximum value in the depth values of the plurality of pixel points is obtained; whether the maximum value is greater than a preset first depth threshold value is judged, if yes, it is identified that the blind hole has the first defect feature, if not, target pixel points with depth values greater than a preset second depth threshold value are screened out; wherein the second depth threshold value is less than the first depth threshold value; the average value h of the depth values corresponding to the plurality of target pixel points and the number n of the plurality of target pixel points are obtained; a first defect value Q is obtained; wherein Q=n h; whether the first defect value Q is greater than a preset defect threshold value is judged, if yes, it is identified that the blind hole has the first defect feature, if not, it is identified that the blind hole does not have the first defect feature; if yes, controlling to complete a supplementary compaction operation on the blind hole after the core rods are installed and returning to obtaining the blind hole depth image after the core rods are extracted based on the view angle facing the side wall of the barrel mold; if no, controlling to complete a hole forming operation on the first body to form a second body; wherein the second body has a reverse tapered hole at the top, and the reverse tapered hole has a spherical protrusion at the bottom; obtaining a laser scanning three-dimensional image of the reverse tapered hole and the spherical protrusion based on a top view angle of the barrel mold; according to the laser scanning three-dimensional image, identifying whether the spherical protrusion has a second defect feature; wherein the second defect feature is a recess feature formed by the surface of the spherical protrusion not being compacted; if yes, controlling to complete a supplementary compaction operation on the spherical protrusion and returning to obtaining the laser scanning three-dimensional image of the reverse tapered hole and the spherical protrusion based on the top view angle of the barrel mold; if no, controlling to complete a thermal deformation treatment on the second body to obtain the Nd-Fe-B magnet.

2. The method of claim 1, wherein the step of controlling the temperature of the melt is performed by controlling the temperature of the melt to a temperature of 1,300°C to 1,400°C. According to the laser scanning three-dimensional image, identifying whether the spherical protrusion has a second defect feature, comprising: constructing a three-dimensional coordinate system according to the laser scanning three-dimensional image; wherein the coordinate origin of the three-dimensional coordinate system is located on the axis of the spherical protrusion; obtaining the vertex coordinates of the spherical protrusion based on the three-dimensional coordinate system; comparing the vertex coordinates with theoretical coordinates to obtain a z-direction coordinate difference; wherein the theoretical coordinates are the coordinate positions of the vertex of the spherical protrusion when the vertex does not have a recess; judging whether the z-direction coordinate difference is greater than a preset first threshold value, if yes, identifying that the spherical protrusion has the second defect feature, and if no, obtaining reference coordinates of the inner wall of the reverse tapered hole at different positions; wherein the reference coordinates are lower than the vertex coordinates; obtaining associated coordinates corresponding to the reference coordinates on the surface of the spherical protrusion; wherein the z-direction coordinate values of the associated coordinates and the reference coordinates are equal, and the line connecting the associated coordinates and the reference coordinates passes through the axis of the spherical protrusion; obtaining a coordinate distance value between the associated coordinates and the reference coordinates; judging whether the coordinate distance value is greater than a preset second threshold value, if yes, identifying that the spherical protrusion has the second defect feature, and if no, identifying that the spherical protrusion does not have the second defect feature.

3. The method of claim 2, wherein the step of controlling the temperature of the melt is performed by controlling the temperature of the melt to a temperature of 1,300°C to 1,400°C. Obtaining reference coordinates of the inner wall of the reverse tapered hole at different positions, comprising: selecting a plurality of discrete first reference coordinates around a circle of a first height position of the inner wall of the reverse tapered hole; wherein the first height position is lower than the vertex coordinates of the spherical protrusion; if the coordinate distance value between the first reference coordinates and the corresponding associated coordinates is less than or equal to the corresponding second threshold value, selecting a plurality of discrete second reference coordinates around a circle of a second height position of the inner wall of the reverse tapered hole; wherein the second height position is lower than the first height position. If the coordinate distance value between the second reference coordinate and the corresponding associated coordinate is less than or equal to the corresponding second threshold value, a plurality of discrete third reference coordinates are selected around a circle of a third height position of the inner wall of the inverted conical hole; wherein the third height position is lower than the second height position; Until the end condition is reached; wherein the end condition is that the current reference coordinate reaches a preset lowest height position or the coordinate distance value between the current reference coordinate and the corresponding associated coordinate is greater than the corresponding second threshold value.

4. The method for controlling the preparation of neodymium iron boron magnets as described in claim 1, characterized in that, The supplementary compaction operation on the blind hole after the installation of the mandrel is controlled, including: The first hydraulic part is controlled to be pressed into the first embryo to form a filling hole in the middle of the first embryo; wherein the first hydraulic part includes a first hydraulic plate, and a core column for forming the filling hole is connected to the bottom of the first hydraulic plate, and the bottom of the filling hole is lower than the position of the blind hole; The filling hole is filled with neodymium-iron-boron magnetic powder, and the first hydraulic plate is controlled to perform compaction treatment on the filled first embryo to complete the supplementary compaction operation on the blind hole.

5. The method for controlling the preparation of neodymium iron boron magnets as described in claim 1, characterized in that, The hole forming operation on the first embryo is controlled to complete, to form a second embryo, including: The second hydraulic part is controlled to be pressed into the first embryo to form a second embryo; wherein the second hydraulic part includes a third hydraulic plate, and an inverted conical column is connected to the bottom of the third hydraulic plate, and an inner groove for forming a spherical protrusion is provided at the bottom of the inverted conical column.

6. The method of claim 5, wherein the step of controlling the temperature of the melt is performed by controlling the temperature of the melt to a temperature of 1,300°C to 1,400°C. The supplementary compaction operation on the spherical protrusion is controlled to complete, including: A corresponding amount of neodymium-iron-boron magnetic powder is added to the spherical protrusion area; The second hydraulic part is controlled to be pressed into the second embryo in alignment with the spherical protrusion to complete the supplementary compaction operation on the spherical protrusion.

7. A system for controlling the production of a neodymium-iron-boron magnet, characterized by It includes: The first control module is used to control the pre-compaction operation on the neodymium-iron-boron magnetic powder to complete based on a specially designed mold to form a first embryo; wherein the specially designed mold includes a barrel mold with a cavity, a plurality of mandrels are movably and penetratively arranged on the side wall of the barrel mold, and the mandrels extend into the cavity and are used to form a blind hole on the side wall of the first embryo; The first image acquisition module is used to acquire a blind hole depth image after the mandrel is extracted based on the side view angle of the barrel mold; The first defect identification module is configured to identify whether the blind hole has a first defect feature according to the blind hole depth image; the first defect feature is a recess feature formed by the non-compaction of the hole end face of the blind hole; the first defect identification module includes: obtaining the depth values of a plurality of pixel points corresponding to the hole end face of the blind hole according to the blind hole depth image; obtaining the maximum value among the depth values of the plurality of pixel points; determining whether the maximum value is greater than a preset first depth threshold value; if yes, it is identified that the blind hole has the first defect feature; if no, target pixel points with depth values greater than a preset second depth threshold value are screened out; the second depth threshold value is less than the first depth threshold value; obtaining the average value h of the depth values of the plurality of target pixel points and the number n of the plurality of target pixel points; obtaining a first defect value Q; Q=n h; determining whether the first defect value Q is greater than a preset defect threshold value; if yes, it is identified that the blind hole has the first defect feature; if no, it is identified that the blind hole does not have the first defect feature. The second control module is used to control the supplementary compaction operation on the blind hole after the installation of the mandrel if yes, and return to acquire the blind hole depth image after the mandrel is extracted based on the view angle directly opposite the side wall of the barrel mold; if no, control the hole forming operation on the first embryo to complete to form a second embryo; wherein the second embryo has an inverted conical hole at the top, and the bottom of the inverted conical hole has a spherical protrusion; The second image acquisition module is used to acquire a laser scanning three-dimensional image of the inverted conical hole and the spherical protrusion based on the top view angle of the barrel mold; The second defect identification module is used to identify whether the spherical protrusion has a second defect feature according to the laser scanning three-dimensional image; wherein the second defect feature is a concave feature formed by the non-compaction of the surface of the spherical protrusion; The third control module is used to control the supplementary compaction operation on the spherical protrusion to complete if yes, and return to acquire the laser scanning three-dimensional image of the inverted conical hole and the spherical protrusion based on the top view angle of the barrel mold; if no, control the heat deformation treatment on the second embryo to complete to obtain the neodymium-iron-boron magnet.

8. A computer device, comprising: The computer device comprises a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the method in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the processor executes the computer program to realize the method in any one of claims 1-6.

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