CN110987953A - Production process of neodymium iron boron magnet and automatic surface defect detection equipment thereof - Google Patents
Production process of neodymium iron boron magnet and automatic surface defect detection equipment thereof Download PDFInfo
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- CN110987953A CN110987953A CN201911333499.7A CN201911333499A CN110987953A CN 110987953 A CN110987953 A CN 110987953A CN 201911333499 A CN201911333499 A CN 201911333499A CN 110987953 A CN110987953 A CN 110987953A
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- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
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- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
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- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/026—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets protecting methods against environmental influences, e.g. oxygen, by surface treatment
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Abstract
The invention discloses a production process of a neodymium iron boron magnet and automatic detection equipment for surface defects of the neodymium iron boron magnet, and belongs to the technical field of neodymium iron boron magnet production, the technical scheme of the invention is characterized by comprising a workbench, wherein a feeding conveyer belt for conveying a neodymium iron boron magnet to be detected, a discharging conveyer belt for conveying a qualified neodymium iron boron magnet, a turn-over mechanism which is positioned between the feeding conveyer belt and the discharging conveyer belt and is used for turning over the neodymium iron boron magnet, and a computer vision detection device which is positioned above the feeding conveyer belt and the discharging conveyer belt and is used for detecting whether the surface of the neodymium iron boron magnet has defects, the discharging conveyer belt is provided with an eliminating mechanism for blocking the unqualified neodymium iron boron magnet, and when the computer vision detection device detects that the surface of the neodymium iron boron magnet has defects, the eliminating mechanism blocks the unqualified neodymium iron, the invention has the effects of quickly detecting the surface defects of the magnet and having reliable detection results.
Description
Technical Field
The invention belongs to the technical field of neodymium iron boron magnet production, and particularly relates to a production process of a neodymium iron boron magnet and automatic surface defect detection equipment thereof.
Background
Neodymium magnet (Neodymium magnet), also known as Neodymium iron boron magnet (NdFeB magnet), is a tetragonal crystal formed of Neodymium, iron, and boron (Nd 2Fe 14B). The magnetic energy product (BHmax) of this magnet was greater than that of a samarium cobalt magnet, and was the largest in magnetic energy product worldwide at that time. This magnet is a permanent magnet that is second only to absolute zero holmium magnets in magnetism today and is also the most commonly used rare earth magnet. Neodymium iron boron magnets are widely used in electronic products such as hard disks, mobile phones, earphones, and battery powered tools.
At present, the surface defects of the magnets formed by machining and electroplating the neodymium iron boron permanent magnets seriously affect the application of customers. The surface defects of the permanent magnet material affect the characteristics of the permanent magnet material concerned by a magnetic material user, such as surface magnetic distribution, magnetic property uniformity and the like, and affect the corrosion resistance of the permanent magnet material, which is an important characteristic determining the service life of the magnet.
In addition, the surface defect of the magnet is often the weak point of the protective function of the coating and the source of failure, and the variation of the coating thickness at the surface defect seriously affects the performance characteristics of the coating, such as the binding force between the coating and the substrate, the coating stress and the like. The surface defect position under the high-temperature and high-humidity experimental environment is always the starting point of the detachment of the coating from the substrate and the crack of the coating.
At present, in the process of producing neodymium iron boron magnets by domestic enterprises, the detection of surface defects of the magnets is mainly manual visual inspection, and is assisted by tools such as a magnifying glass, a microscope and the like. However, manual visual inspection has many limitations and disadvantages: on one hand, due to the influence of production environment and working strength, detection personnel are easy to fatigue, so that the phenomena of missed detection and wrong judgment are caused; on the other hand, enterprises face rapid production processes brought by rapidly increased market demands and high productivity, and in order to ensure that a large number of products are timely transferred and provided for customers, the number of detection personnel has to be increased to ensure the detection speed, so that the personnel cost is greatly increased. Therefore, it is urgently required to produce a rapid and reliable automatic surface defect detection device to solve the above problems.
Disclosure of Invention
In view of the defects of the prior art, a first object of the present invention is to provide an apparatus for automatically detecting surface defects of a neodymium-iron-boron magnet, which has the advantages of being capable of rapidly detecting surface defects of the magnet and having reliable detection results.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a neodymium iron boron magnetism iron boron's surface defect automatic check out test set, includes the workstation, set gradually on the workstation and be used for carrying the material loading conveyer belt that waits to detect neodymium iron boron magnetism iron.
Through adopting above-mentioned technical scheme, at the during operation, will wait to detect neodymium iron boron magnet after electroplating and place on the material loading conveyer belt earlier to detect neodymium iron boron magnet's front or reverse side through computer vision detection device, neodymium iron boron magnet turns over and gets into the unloading conveyer belt under the effect of turn-over mechanism afterwards, and detect neodymium iron boron magnet's front or reverse side through computer vision detection device once more, if the front and the reverse side of neodymium iron boron magnet are all qualified, then carry to qualified region through the unloading conveyer belt. Wherein, if computer visual inspection device detects that there is the defect in neodymium iron boron magnetism iron boron surface, then block unqualified neodymium iron boron magnetism iron boron to continue to move to the unloading conveyer belt through rejecting the mechanism, prevent that unqualified neodymium iron boron magnetism iron boron from mixing with qualified neodymium iron boron magnetism iron boron.
Compared with the original manual visual inspection mode, the equipment can quickly detect the surface defects of the magnet, and the detection result is reliable.
The invention is further configured to: turn-over mechanism including be located the terminal upset section of material loading conveyer belt and export towards the unloading conveyer belt, rotate set up in returning face plate in the upset section and be used for the drive returning face plate pivoted upset motor, the returning face plate up end be provided with the constant head tank of neodymium iron boron magnet shape size looks adaptation.
Through adopting above-mentioned technical scheme, when neodymium iron boron magnetism iron gets into in the upset cylinder and places in the constant head tank of returning face plate, the upset motor drives the returning face plate and carries out 180 degrees rotations, makes the neodymium iron boron magnetism iron on the returning face plate drop to the unloading conveyer belt on, realizes the turn-over of neodymium iron boron magnetism iron boron promptly.
The invention is further configured to: the utility model discloses a material loading conveyer belt, including a feeding conveyer belt, a material loading conveyer belt, a turnover cylinder, a driving slider, a lifting cylinder, a locating groove, a piston rod, a last spout that extends along its direction of height is provided with on the lateral wall that material loading conveyer belt was kept away from to the turnover cylinder, the spout internal slipping is connected with the slider, the upset motor is installed the slider deviates from the inside one side of turnover cylinder, a turnover cylinder upper end is provided with the lifting cylinder that the driving slider removed along the spout direction, be provided with in the locating groove and be used for the response neodymium iron boron magnet and with lifting cylinder electric connection's infrared sensor, all be provided with the travel switch with lifting cylinder electric connection on the inner wall at both ends about the spout, work as when the.
By adopting the technical scheme, when the neodymium iron boron magnet is conveyed to the tail end of the feeding conveyer belt, the lifting cylinder drives the sliding block to move upwards, when the sliding block triggers the travel switch at the upper end of the sliding groove, the piston rod of the lifting cylinder stops moving, the upper surface of the turnover plate is level with the upper surface of the feeding conveyer belt, and the neodymium iron boron magnet on the feeding conveyer belt can smoothly enter the positioning groove on the turnover plate; when infrared inductor senses that there is neodymium iron boron magnet in the constant head tank, the lift cylinder drives the slider and moves down, treats that the slider triggers the travel switch of spout lower extreme, and the piston rod stop motion of lift cylinder, upset motor drive returning face plate carry out 180 degrees rotations.
The invention is further configured to: the lower terminal surface of returning face plate is provided with the electro-magnet that is used for adsorbing neodymium iron boron magnetism iron, the electro-magnet pass through the controller with upset motor electric connection.
Through adopting above-mentioned technical scheme, when neodymium iron boron magnet got into the turnover cylinder, the electro-magnet got to the electricity, can adsorb neodymium iron boron magnet in the constant head tank of returning face plate, treats 180 degrees backs of returning face plate upset, and the electro-magnet loses the electricity, can make neodymium iron boron magnet steadily drop at the unloading conveyer belt to improve the stability of neodymium iron boron magnet turn-over.
The invention is further configured to: the rejecting mechanism comprises a baffle which is rotatably arranged on the workbench and is arranged at the same width as the blanking conveying belt, and a driving assembly which is used for driving the baffle to rotate on the plane where the blanking conveying belt is located, and the control end of the driving assembly is electrically connected with the computer vision detection device.
Through adopting above-mentioned technical scheme, when computer vision detection device detected that there is the defect in neodymium iron boron magnetism iron boron magnet surface, feed back to drive assembly's control end, make drive assembly control baffle rotate and seal the discharge end of unloading conveyer belt, realize blockking to unqualified neodymium iron boron magnetism iron boron.
The invention is further configured to: the driving assembly comprises a transmission shaft which is perpendicular to the surface of the workbench and is in transmission connection with the baffle, a driving gear which is fixed on the outer side of the transmission shaft and is meshed with the transmission gear, and a driving motor which is used for driving the driving gear to rotate, wherein the driving motor is electrically connected with the computer vision detection device through a controller.
Through adopting above-mentioned technical scheme, after driving motor starts, through driving gear and driven gear's intermeshing, can make the transmission shaft and the baffle of being connected with the transmission shaft rotate, realize that the baffle rotates at blanking conveyer belt place plane.
The second purpose of the invention is to provide a production process of the neodymium iron boron magnet, which has the advantages of corrosion resistance, capability of detecting the surface of the neodymium iron boron magnet and reduction of unnecessary energy consumption.
In order to achieve the purpose, the invention provides the following technical scheme: the production process of the neodymium iron boron magnet adopts the surface defect automatic detection equipment of the neodymium iron boron magnet, and comprises the following steps:
s1, preparing materials: preparing a blocky or cylindrical neodymium iron boron raw material;
s2, pretreatment: mixing 80-mesh glass beads and brown corundum in a weight ratio of 3: 1, uniformly mixing the materials to be used as a sand blasting abrasive, blasting sand on the neodymium iron boron prepared in S1 by using 0.3Mpa of compressed air until the surface of the neodymium iron boron is bright, then putting the neodymium iron boron subjected to sand blasting into alcohol for ultrasonic cleaning for 20min, and drying for later use;
s3, stacking and cutting: firstly, stacking and bonding the neodymium iron boron obtained in the step S2 on an asbestos plate to obtain a bonding block, and coating an aluminum protective coating on the surface of the bonding block; cutting off the end scraps of the adhesive material block by a slicing machine to obtain a semi-finished material block;
s4, cooking, namely placing the semi-finished product blocks obtained in the step S3 into water cooking liquid added with additives for cooking treatment, so that the semi-finished product blocks are cooked and dispersed to obtain magnet blocks;
s5, surface treatment: firstly, the magnet block obtained in the step S4 is placed in a grinding machine for grinding treatment, then the magnet block is chamfered, and impurities of the magnet block are cleaned through a wind box;
s6, electroplating: electroplating the magnet block obtained in the step S4, wherein the electroplating process sequentially comprises an electrogalvanizing process and an electronickeling process;
s7, surface defect detection: detecting the magnet block obtained in the step S5 through automatic surface defect detection equipment to obtain a qualified magnet block;
s8, magnetizing: and (5) magnetizing the magnet block obtained in the step (S8) to obtain a finished magnet.
By adopting the technical scheme, the sand is blasted on the surface of the neodymium iron boron until the surface of the neodymium iron boron is bright, then the sand-blasted neodymium iron boron is put into alcohol for ultrasonic cleaning for 20min, and the aluminum protective coating is coated on the surface of the bonding material block, so that the corrosion resistance of the finished magnet can be improved, and the defects on the surface of the magnet can be avoided. In addition, after the magnet block is electroplated, the magnet block is detected by the automatic detection equipment for the surface defects of the magnet block, so that the subsequent magnetizing of the magnet block with the surface defects can be avoided, and the unnecessary energy consumption is reduced.
The invention is further configured to: the raw material components of the adhesive used in the step S3 of stacking raw materials are calculated according to the following parts by mass:
100-150 parts of (α, omega) -dihydroxy polydimethylsiloxane
100-300 parts of filler
1-10 parts of cross-linking agent
1-5 parts of catalyst
By adopting the technical scheme, the sealant prepared from the (α, omega) -dihydroxy polydimethylsiloxane within the viscosity range has better toughness, extrudability and hardness, so that the neodymium iron boron can be stably bonded on the asbestos board, and the accuracy of subsequent cutting is ensured.
The invention is further configured to: the filler is any one or the combination of more than two of titanium dioxide, white carbon black, zinc oxide and silicon micropowder.
The invention is further configured to: the specific preparation method of the adhesive comprises the following steps:
(1) adding (α, omega) -dihydroxy polydimethylsiloxane and a filler into a dynamic mixer according to the amount, and defoaming under heating;
(2) cooling to room temperature, adding a cross-linking agent, and defoaming;
(3) then adding a catalyst, and defoaming to obtain the binder.
In summary, the invention has the following advantages:
1. the invention can quickly detect the surface defects of the magnet, and the detection result is reliable;
2. when the computer vision detection device detects that the surface of the neodymium iron boron magnet has defects, the unqualified neodymium iron boron magnet can be blocked by the removing mechanism to continuously move to the blanking conveyer belt, so that the unqualified neodymium iron boron magnet and the qualified neodymium iron boron magnet are prevented from being mixed;
3. and (3) sand blasting is carried out on the surface of the neodymium iron boron until the surface of the neodymium iron boron is bright, then the neodymium iron boron subjected to sand blasting is placed into alcohol for ultrasonic cleaning for 20min, and an aluminum protective coating is coated on the surface of the bonding material block, so that the corrosion resistance of the finished magnet can be improved, and the defect of the surface of the magnet is avoided.
Drawings
FIG. 1 is a schematic view of the overall structure of the present embodiment;
FIG. 2 is a schematic view of a part of the raised turnover mechanism of the present embodiment;
FIG. 3 is an enlarged view of A in FIG. 2;
FIG. 4 is a schematic view of a portion of the salient driving component of this embodiment.
Description of reference numerals: 1. a work table; 2. a feeding conveyer belt; 3. blanking a conveying belt; 4. a turn-over mechanism; 41. turning over the drum; 411. a connector tile; 412. a chute; 4121. a travel switch; 413. a slider; 414. a lifting cylinder; 42. a turnover plate; 421. positioning a groove; 4211. an infrared sensor; 422. an electromagnet; 43. turning over a motor; 5. a computer vision inspection device; 6. a rejection mechanism; 61. a baffle plate; 62. a drive assembly; 621. a drive shaft; 622. a transmission gear; 623. a driving gear; 624. a drive motor; 7. an orientation plate; 8. and (4) orienting the channel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides a neodymium iron boron magnetism iron boron's surface defect automatic check out test set, as shown in figure 1, including workstation 1, set gradually on workstation 1 and be used for carrying the material loading conveyer belt 2 that waits to detect neodymium iron boron magnetism iron boron magnetism iron boron.
As shown in fig. 1, two orientation plates 7 which are parallel to each other and have the extending direction consistent with the moving direction of the conveyor belt are mounted on the workbench 1 and above the feeding conveyor belt 2 and the discharging conveyor belt 3, the orientation plates 7 are fixed to the edge of the workbench 1 through support rods, the distance between the lower end of each orientation plate 7 and the surface of the conveyor belt is 0.01mm, an orientation channel 8 for allowing the neodymium iron boron magnet to pass through is formed between the two orientation plates 7, and a camera of the computer vision detection device 5 is over against the area where the orientation channel 8 is located.
Referring to fig. 2 and 3, the turnover mechanism 4 includes a turnover drum 41 located at the end of the feeding conveyor belt 2 and having an outlet facing the discharging conveyor belt 3, a turnover plate 42 rotatably disposed in the turnover drum 41, and a turnover motor 43 for driving the turnover plate 42 to rotate, a connecting plate 411 attached to the end of the feeding conveyor belt 2 extends from the outer wall of the turnover drum 41, and the connecting plate 411, the turnover drum 41, and the upper end face of the feeding conveyor belt 2 are located on the same horizontal plane. In addition, the locating slot 421 with neodymium iron boron magnet shape size looks adaptation is seted up to returning face plate 42 up end, and when neodymium iron boron magnet got into the locating slot 421 of returning face plate 42 through linking up board 411 in, the upset motor 43 drove returning face plate 42 and carries out 180 degrees rotations, makes the neodymium iron boron magnet on the returning face plate 42 drop to unloading conveyer belt 3 on, realizes neodymium iron boron magnet's turn-over promptly.
As shown in fig. 2 and 3, the upper end of the turning cylinder 41 is a semi-enclosed structure, the opening of the turning cylinder faces the directional channel 8, a sliding groove 412 extending along the height direction is formed on one side wall of the turning cylinder 41 away from the feeding conveyor belt 2, a sliding block 413 is connected in the sliding groove 412 in a sliding manner, the turning motor 43 is installed on one side of the sliding block 413 departing from the interior of the turning cylinder 41, the upper end of the turning cylinder 41 is provided with a lifting cylinder 414 for driving the sliding block 413 to move along the direction of the sliding groove 412, an infrared sensor 4211 for sensing the nd-fe-b magnet and electrically connected with the lifting cylinder 414 is installed in the positioning groove 421, the inner walls of the upper and lower ends of the sliding groove 412 are both, when the slide block 413 triggers the travel switch 4121 at the upper end of the slide groove 412, the piston rod of the lifting cylinder 414 stops moving, and the upper surface of the turnover plate 42 is flush with the upper surface of the feeding conveyor belt 2.
When the ndfeb magnet is conveyed to the tail end of the feeding conveyor belt 2, the lifting cylinder 414 drives the slider 413 to move upwards, when the slider 413 triggers the travel switch 4121 at the upper end of the sliding groove 412, the piston rod of the lifting cylinder 414 stops moving, the upper surface of the turnover plate 42 is level with the upper surface of the feeding conveyor belt 2, so that the ndfeb magnet on the feeding conveyor belt 2 can smoothly enter the positioning groove 421 on the turnover plate 42; when the infrared sensor senses that the neodymium iron boron magnet exists in the positioning groove 421, the lifting cylinder 414 drives the sliding block 413 to move downwards, when the sliding block 413 triggers the travel switch 4121 at the lower end of the sliding groove 412, the piston rod of the lifting cylinder 414 stops moving, and the turnover motor 43 drives the turnover plate 42 to rotate for 180 degrees.
It should be mentioned that, in order to make things convenient for neodymium iron boron magnet to get into the constant head tank 421, the upper surface of the roll-over plate 42 in this embodiment is the chamfer setting, and lower one side is towards the constant head tank 421.
As shown in fig. 3, an electromagnet 422 for adsorbing the ndfeb magnet is disposed on the lower end surface of the flipping plate 42, and the electromagnet 422 is electrically connected to the flipping motor 43 through a controller. When neodymium iron boron magnetism body got into turnover cylinder 41, electro-magnet 422 got electric, can adsorb neodymium iron boron magnetism body in the constant head tank 421 of returning face plate 42, treats 180 degrees backs of returning face plate 42 upset, and electro-magnet 422 loses the electricity, can make neodymium iron boron magnetism body steadily drop at unloading conveyer belt 3 to improve the stability of neodymium iron boron magnetism body turn-over.
As shown in fig. 1 and 4, the rejecting mechanism 6 includes a baffle 61 rotatably disposed on the working table 1 and having the same width as the blanking conveyor belt 3, and a driving assembly 62 for driving the baffle 61 to rotate on the plane of the blanking conveyor belt 3. Specifically, the driving assembly 62 includes a driving shaft 621 perpendicular to the surface of the table 1 and drivingly connected to the barrier 61, a driving gear 623 fixed to the outside of the driving shaft 621 and engaged with the driving gear 622, and a driving motor 624 for driving the driving gear 623 to rotate. Therefore, when the computer vision inspection device 5 detects that the surface of the neodymium iron boron magnet has defects, the defects are fed back to the control end of the driving motor 624, so that the driving motor 624 controls the baffle 61 to rotate and seal the discharging end of the discharging conveying belt 3, and the unqualified neodymium iron boron magnet is blocked.
The working process and the beneficial effects of the invention are as follows: when the device works, the electroplated neodymium iron boron magnet to be detected is placed on the feeding conveyer belt 2, the front side or the back side of the neodymium iron boron magnet is detected by the computer vision detection device 5, then the neodymium iron boron magnet enters the turnover plate 42 in the turnover cylinder 41 through the connecting plate 411, at the moment, the neodymium iron boron magnet is adsorbed in the positioning groove 421 of the turnover plate 42 by the electromagnet 422, the neodymium iron boron magnet is sensed by the infrared sensor, the lifting cylinder 414 is controlled to drive the sliding block 413 to move downwards, when the sliding block 413 triggers the stroke switch 4121 at the lower end of the sliding groove 412, the piston rod of the lifting cylinder 414 stops moving, the turnover motor 43 drives the turnover plate 42 to rotate for 180 degrees, after the turnover plate 42 is turned over for 180 degrees, the electromagnet 422 is de-energized, so that the neodymium iron boron magnet stably, and the front or the back of the neodymium iron boron magnet is detected again through the computer vision detection device 5. If the front and the back of the neodymium iron boron magnet are qualified, the neodymium iron boron magnet is conveyed to a qualified area through a blanking conveying belt 3; if computer visual inspection device 5 detects that there is the defect in neodymium iron boron magnetism iron boron surface, then block unqualified neodymium iron boron magnetism iron boron to continue to move to unloading conveyer belt 3 through rejecting mechanism 6, prevent that unqualified neodymium iron boron magnetism iron boron from mixing with qualified neodymium iron boron magnetism iron boron.
Compared with the original manual visual inspection mode, the equipment can quickly detect the surface defects of the magnet, and the detection result is reliable.
A production process of a neodymium iron boron magnet comprises the following steps:
s1, preparing materials: preparing a blocky or cylindrical neodymium iron boron raw material;
s2, pretreatment: mixing 80-mesh glass beads and brown corundum in a weight ratio of 3: 1, uniformly mixing the materials to be used as a sand blasting abrasive, blasting sand on the neodymium iron boron prepared in S1 by using 0.3Mpa of compressed air until the surface of the neodymium iron boron is bright, then putting the neodymium iron boron subjected to sand blasting into alcohol for ultrasonic cleaning for 20min, and drying for later use;
s3, stacking and cutting: firstly, stacking and bonding the neodymium iron boron obtained in the step S2 on an asbestos plate to obtain a bonding block, and coating an aluminum protective coating on the surface of the bonding block; cutting off the end scraps of the adhesive material block by a slicing machine to obtain a semi-finished material block;
s4, cooking, namely placing the semi-finished product blocks obtained in the step S3 into water cooking liquid added with additives for cooking treatment, so that the semi-finished product blocks are cooked and dispersed to obtain magnet blocks;
s4, surface treatment: firstly, the magnet block obtained in the step S4 is placed in a grinding machine for grinding treatment, then the magnet block is chamfered, and impurities of the magnet block are cleaned through a wind box;
s5, electroplating: electroplating the magnet block obtained in the step S4, wherein the electroplating process sequentially comprises an electrogalvanizing process and an electronickeling process;
s6, surface defect detection: detecting the magnet block obtained in the step S5 through automatic surface defect detection equipment to obtain a qualified magnet block;
s7, magnetizing: and (5) magnetizing the magnet block obtained in the step (S8) to obtain a finished magnet.
Further, the raw material components of the binder used when stacking the raw materials in step S3 are calculated by the following parts by mass:
100 parts of dihydroxypolydimethylsiloxane having a viscosity of 5000cps (α, omega)
300 parts of silicon micropowder
10 parts of vinyl trimethoxy silane
The preparation method comprises the following steps:
(1) adding the α, omega-dihydroxy polydimethylsiloxane with the viscosity of 5000cps and the silicon micropowder into a power mixer according to the amount, and stirring and defoaming for 3 hours at the temperature of 120 ℃ and the vacuum degree of-0.03 MPa;
(2) cooling to room temperature, adding vinyl trimethoxy silane, and stirring and defoaming for 10 minutes under the vacuum degree of-0.12 MPa;
(3) then adding a catalyst, stirring and defoaming for 10 minutes under the vacuum condition to obtain the binder.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a surface defect automatic checkout equipment of neodymium iron boron magnetism iron, its characterized in that: comprises a workbench (1), a feeding conveyer belt (2) for conveying neodymium iron boron magnets to be detected, a discharging conveyer belt (3) for conveying qualified neodymium iron boron magnets, a turn-over mechanism (4) which is positioned between the feeding conveyer belt (2) and the discharging conveyer belt (3) and is used for turning over the neodymium iron boron magnets, and a computer vision detection device (5) which is positioned above the feeding conveyer belt (2) and the discharging conveyer belt (3) and is used for detecting whether defects exist on the surfaces of the neodymium iron boron magnets are sequentially arranged on the workbench (1), the blanking conveyer belt (3) is provided with a rejecting mechanism (6) for blocking unqualified neodymium iron boron magnet, when the computer vision detection device (5) detects that the surface of the neodymium iron boron magnet has defects, and the rejecting mechanism (6) blocks the unqualified neodymium iron boron magnet from continuously moving to the blanking conveyer belt (3).
2. The automatic surface defect detection device for the neodymium-iron-boron magnet according to claim 1, characterized in that: turn-over mechanism (4) including be located material loading conveyer belt (2) end and export upset cylinder (41) towards unloading conveyer belt (3), rotate set up in returning face plate (42) in upset cylinder (41) and be used for the drive returning face plate (42) pivoted upset motor (43), returning face plate (42) up end be provided with constant head tank (421) of neodymium iron boron magnet shape size looks adaptation.
3. The automatic surface defect detection device for the neodymium-iron-boron magnet according to claim 2, characterized in that: a sliding groove (412) extending along the height direction of the turning drum (41) is formed in one side wall of the turning drum (41) far away from the feeding conveying belt (2), a sliding block (413) is connected to the sliding groove (412) in a sliding mode, the turning motor (43) is installed on one side, away from the inside of the turning drum (41), of the sliding block (413), a lifting cylinder (414) which drives the sliding block (413) to move along the direction of the sliding groove (412) is arranged at the upper end of the turning drum (41), an infrared sensor (4211) which is used for sensing the neodymium iron boron magnet and electrically connected with the lifting cylinder (414) is arranged in the positioning groove (421), stroke switches (4121) electrically connected with the lifting cylinder (414) are arranged on the inner walls of the upper end and the lower end of the sliding groove (412), and when the sliding block (413) triggers the stroke switches (4121) at the upper end of the sliding groove (, the upper surface of the turnover plate (42) is level with the upper surface of the feeding conveyer belt (2).
4. The automatic surface defect detection device for the neodymium-iron-boron magnet according to claim 2, characterized in that: the lower terminal surface of returning face plate (42) is provided with electro-magnet (422) that are used for adsorbing neodymium iron boron magnetism iron, electro-magnet (422) through the controller with upset motor (43) electric connection.
5. The automatic surface defect detection device for the neodymium-iron-boron magnet according to claim 1, characterized in that: the rejecting mechanism (6) comprises a baffle (61) which is rotatably arranged on the workbench (1) and is arranged at the same width as the blanking conveying belt (3) and a driving assembly (62) which is used for driving the baffle (61) to rotate on the plane where the blanking conveying belt (3) is located, and the control end of the driving assembly (62) is electrically connected with the computer vision detection device (5).
6. The automatic surface defect detection device for the neodymium-iron-boron magnet according to claim 5, characterized in that: the driving assembly (62) comprises a transmission shaft (621) which is perpendicular to the surface of the workbench (1) and is in transmission connection with the baffle (61), a driving gear (623) which is fixed on a transmission gear (622) on the outer side of the transmission shaft (621) and is meshed with the transmission gear (622), and a driving motor (624) used for driving the driving gear (623) to rotate, wherein the driving motor (624) is electrically connected with the computer vision detection device (5) through a controller.
7. A production process of a neodymium iron boron magnet, which adopts the surface defect automatic detection equipment of the neodymium iron boron magnet as claimed in any one of claims 1 to 6, and is characterized by comprising the following steps:
s1, preparing materials: preparing a blocky or cylindrical neodymium iron boron raw material;
s2, pretreatment: mixing 80-mesh glass beads and brown corundum in a weight ratio of 3: 1, uniformly mixing the materials to be used as a sand blasting abrasive, blasting sand on the neodymium iron boron prepared in S1 by using 0.3Mpa of compressed air until the surface of the neodymium iron boron is bright, then putting the neodymium iron boron subjected to sand blasting into alcohol for ultrasonic cleaning for 20min, and drying for later use;
s3, stacking and cutting: firstly, stacking and bonding the neodymium iron boron obtained in the step S2 on an asbestos plate to obtain a bonding block, and coating an aluminum protective coating on the surface of the bonding block; cutting off the end scraps of the adhesive material block by a slicing machine to obtain a semi-finished material block;
s4, cooking, namely placing the semi-finished product blocks obtained in the step S3 into water cooking liquid added with additives for cooking treatment, so that the semi-finished product blocks are cooked and dispersed to obtain magnet blocks;
s5, surface treatment: firstly, the magnet block obtained in the step S4 is placed in a grinding machine for grinding treatment, then the magnet block is chamfered, and impurities of the magnet block are cleaned through a wind box;
s6, electroplating: electroplating the magnet block obtained in the step S4, wherein the electroplating process sequentially comprises an electrogalvanizing process and an electronickeling process;
s7, surface defect detection: detecting the magnet block obtained in the step S5 through automatic surface defect detection equipment to obtain a qualified magnet block;
s8, magnetizing: and (5) magnetizing the magnet block obtained in the step (S8) to obtain a finished magnet.
8. The production process of a neodymium iron boron magnet according to claim 7, characterized in that the raw material components of the binder used in stacking the raw materials in step S3 are calculated by the following parts by mass:
100-150 parts of (α, omega) -dihydroxy polydimethylsiloxane
100-300 parts of filler
1-10 parts of cross-linking agent
1-5 parts of a catalyst.
9. A production process of a neodymium iron boron magnet according to claim 8, characterized in that the filler is any one or a combination of more than two of titanium dioxide, white carbon black, zinc oxide and silica micropowder.
10. The production process of a neodymium iron boron magnet according to claim 8, characterized in that the specific preparation method of the binder is as follows:
(1) adding (α, omega) -dihydroxy polydimethylsiloxane and a filler into a dynamic mixer according to the amount, and defoaming under heating;
(2) cooling to room temperature, adding a cross-linking agent, and defoaming;
(3) then adding a catalyst, and defoaming to obtain the binder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911333499.7A CN110987953A (en) | 2019-12-23 | 2019-12-23 | Production process of neodymium iron boron magnet and automatic surface defect detection equipment thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911333499.7A CN110987953A (en) | 2019-12-23 | 2019-12-23 | Production process of neodymium iron boron magnet and automatic surface defect detection equipment thereof |
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| CN201911333499.7A Withdrawn CN110987953A (en) | 2019-12-23 | 2019-12-23 | Production process of neodymium iron boron magnet and automatic surface defect detection equipment thereof |
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Application publication date: 20200410 |