A hardness detection device and detection method for sintered NdFeB

Abstract

The present invention relates to the field of NdFeB detection technology, and specifically, to a hardness detection device and detection method for sintered NdFeB, wherein the device includes a base plate, etc.; the base plate is a load-bearing carrier of the detection device, a plurality of cylinders are fixedly mounted on the base plate, and the mounting frame is a square frame and is fixedly mounted on the telescopic rods of the plurality of cylinders; it also includes: a guide seat, fixedly mounted on the top surface of the base plate, a slide groove is provided in the middle of the guide seat, a threaded seat is fixedly provided at one end of the guide seat, and a fixed block is fixedly provided at the other end of the guide seat; a support plate is slidably mounted in the slide groove of the guide seat. The present invention can adapt to sintered NdFeB blanks of different shapes and hardnesses through adjustable clamps and replaceable extrusion contacts, thereby expanding the application range of the equipment, and then synchronously performing multi-point hardness detection on the NdFeB blanks through multiple hardness detection mechanisms, thereby achieving comprehensiveness and high efficiency in the detection of the NdFeB blanks.

Description

Technical Field

[0001] The present invention relates to the technical field of NdFeB detection, and in particular to a hardness detection device and a detection method for sintered NdFeB. Background Art

[0002] As a key permanent magnet material, sintered NdFeB has been widely used in high-performance motors, generators, sensors and other fields due to its excellent magnetic properties, such as high remanence, high coercivity and high magnetic energy product. In the production process of sintered NdFeB, hardness is a crucial parameter, which directly affects the application scenario and performance of the final product. Therefore, accurate hardness testing of sintered NdFeB is of great significance to ensure product quality.

[0003] Existing sintered NdFeB hardness testing devices have some limitations in practical applications. On the one hand, these devices can usually only apply pressure to the material in a specific direction for single-point testing, which means that to fully evaluate the performance of the material, it is necessary to adjust its angle or position multiple times, which not only increases the complexity of the operation, but also increases the time cost. On the other hand, some testing devices lack built-in appearance inspection functions. After completing the hardness test, additional equipment and steps are required for appearance inspection, which undoubtedly increases the production cost and the complexity of the testing process.

[0004] In view of the above problems, the present invention aims to provide a hardness detection device and method for sintered NdFeB, which can realize comprehensive and efficient detection of sintered NdFeB blanks by improving the existing technology, while reducing operation complexity and cost. Summary of the invention

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a hardness detection device and a detection method for sintered NdFeB.

[0006] The technical implementation scheme of the present invention is: a hardness detection device for sintered NdFeB, including a base plate, a cylinder and a mounting frame, wherein the base plate is a load-bearing carrier of the detection device, a plurality of cylinders are fixedly mounted on the base plate, and the mounting frame is a square frame and is fixedly mounted on the telescopic rods of the plurality of cylinders; further comprising: a guide seat, fixedly arranged on the top surface of the base plate, a slide groove is provided in the middle of the guide seat, a threaded seat is fixedly provided at one end of the guide seat, and a fixed block is fixedly provided at the other end of the guide seat; a support plate, slidably mounted in the slide groove of the guide seat, and the support plate is used to place the NdFeB blank to be tested; a movable block, slidably arranged on the guide seat On the top surface; an adjusting screw rod, which is threaded through the threaded seat and then rotatably installed on the movable block; a clamping piece, which is respectively arranged on the opposite side of the fixed block and the sliding block, and the two clamping pieces are used to adapt to and clamp NdFeB blanks of different shapes, and the clamping piece includes a mounting block, a first semicircular block, a second semicircular block and a buffer pad, and the mounting block is fixedly connected to the opposite side of the fixed block and the sliding block, and the mounting block is rotatably installed on the first semicircular block through two semicircular grooves, and the first semicircular block is also provided with two semicircular grooves, and the second semicircular blocks are rotatably installed in the semicircular groove of the first semicircular block in groups of two, and the clamping surface of the second semicircular block A buffer pad is provided; a hardness detection mechanism is provided with four groups and is circumferentially arranged at the four sides of the installation frame, and the hardness detection mechanism includes: a sliding frame, which is slidably installed inside the frame of the installation frame; a detection switching disk, which is rotatably arranged on the side of the sliding frame close to the NdFeB blank; a plurality of mounting cylinders are provided and circumferentially fixed on the side wall of the detection switching disk, and there is a certain interval between adjacent mounting cylinders; an extrusion contact is provided with various specifications and is circumferentially arranged on the detection switching disk through the mounting cylinder; a pressure sensor is arranged between the mounting cylinder and the extrusion contact; a hydraulic cylinder, the number of which is the same as that of the sliding frame and is respectively fixed on the mounting frame On the side walls of the four sides, the telescopic rod of the hydraulic cylinder passes through the installation frame and is connected to the corresponding sliding frame; the driving member is arranged on the sliding frame, and the driving member is used to drive the detection switching disk to switch the extrusion contacts of different specifications. After the clamping member stably clamps the NdFeB billet to be detected, the driving member drives the detection switching disk to switch the appropriate extrusion contact according to the current composition of the sintered NdFeB billet, and then the multiple hydraulic cylinders around the installation frame synchronize the sliding frame to move inward, and synchronously extrude the NdFeB billet from multiple directions, so as to control the hydraulic cylinder to output different pressures to detect the hardness of the NdFeB billet, so as to evaluate whether the quality of the NdFeB billet meets the standards.

[0007] Furthermore, the extrusion contacts are all detachably installed in the installation tube, and the extrusion contacts can be replaced with extrusion contacts of different materials (diamond or alloy) or sizes according to the size and shape of the current NdFeB blank, so that the detection device can adapt to the detection of different NdFeB blanks.

[0008] Furthermore, a microscope is installed between adjacent extrusion contacts on the detection switching disk, and the extrusion contacts and the microscope are evenly spaced. The microscope is used to observe the size of the indentation after the NdFeB blank is squeezed by the extrusion contact, so as to determine the hardness of the NdFeB blank. The microscope can also be used to observe whether there are defects on the surface of the NdFeB blank. A parameter display screen is installed on the bottom plate, and the parameter display screen is used to display various parameters of the current NdFeB blank after detection.

[0009] Furthermore, the driving member includes: a worm wheel, fixedly connected to the rotating shaft of the detection switching disk; a first motor, fixedly mounted on the sliding frame; a worm, wherein the worm is mounted on the output shaft of the first motor through a coupling, the worm wheel and the worm are meshed with each other, and the first motor drives the worm to rotate through the coupling, and the rotating worm meshes with the worm wheel and drives the detection switching disk to rotate, so that the extrusion contacts on the detection switching disk can be flexibly switched, and at the same time, the worm self-locks the worm wheel, so that the extrusion contacts with adjusted detection angles cannot be easily rotated, thereby improving the stability of the device during hardness detection.

[0010] Furthermore, a spline block is fixedly connected to the bottom of the rotating shaft of the detection switching disk, and a circle of slots are arranged on the circumferential side wall of the spline block, and the slots of the spline block are pointed cone slots from the outside to the inside. An electric push rod is fixedly provided at the bottom of the sliding frame, and a block is installed on the telescopic rod of the electric push rod, and the block is a wedge-shaped block adapted to the slot of the spline block. The electric push rod is inserted into the slot of the spline block through the block, thereby locking the detection switching disk, thereby further improving the stability of the extruded contact or the microscope on the detection switching disk after rotation switching.

[0011] Furthermore, a flaw detector is provided on one side of the inner wall of the installation frame, and the flaw detector is used to detect whether cracks and other defects occur inside the NdFeB blank before and after hardness testing. The flaw detector includes: an electric slide rail, fixedly connected to one side of the inner wall of the installation frame; a slider, slidably installed on the electric slide rail; a probe, installed on the slider, and the probe is used to emit ultrasonic waves for detection to the NdFeB blank; an ultrasonic signal display, installed on the bottom plate, and the ultrasonic signal display is electrically connected to the probe through a wire, and the ultrasonic signal display is used to intuitively display the ultrasonic image signal generated when the probe is inserted into the NdFeB blank, so that the operator can judge whether there are defects inside the NdFeB blank and the location of the defects based on the image or data.

[0012] Furthermore, a circular groove is provided inside the support plate, and a rotating part is provided in the circular groove of the support plate, and the rotating part includes a disc, a guide rail and a second motor. The disc is rotatably installed in the circular groove of the support plate, and the top surface of the disc is flush with the top surface of the support plate. A guide rail is provided on the bottom of the guide seat on the bottom plate, and the second motor is slidably installed on the guide rail. The output shaft of the second motor is connected to the rotation center of the disc. The disc is driven to rotate by the second motor, so that the disc can drive the NdFeB billet placed on the support plate to rotate, so that the NdFeB billet can rotate to change different hardness detection points and defect observation positions, thereby improving the efficiency of NdFeB billet detection.

[0013] Furthermore, an electric suction cup is provided at the rotation center of the disc, and the suction cup surface of the electric suction cup is flush with the supporting top surface of the disc, thereby improving the stability of the NdFeB blank placed on the support plate and the disc and avoiding the risk of the NdFeB blank tipping over during hardness testing.

[0014] A method for detecting the hardness of sintered NdFeB, the method uses the hardness detection device for sintered NdFeB, and the specific steps are as follows:

[0015] S1, placing the NdFeB blank to be tested on the support plate, using the clamping piece to adaptively fit and firmly clamp the NdFeB blanks of different shapes, starting the second motor to rotate the disc to adjust the position of the NdFeB blank, and using the electric suction cup to absorb the NdFeB blank placed on the support plate;

[0016] S2. According to the specific composition, shape and size of the NdFeB blank, use the driving part to rotate the detection switching disk, select the extrusion contact of suitable specifications and materials, and then synchronously operate the hydraulic cylinders on the four sides of the mounting frame to move the sliding frame inward, so that the selected extrusion contact can synchronously apply the pressure required for hardness testing to the NdFeB blank from multiple directions, and observe and control the pressure value applied to the NdFeB blank through the pressure sensor;

[0017] S3. Operate the hydraulic cylinders on the four sides of the mounting frame to move the slide frame outward, use the drive member to rotate the detection switching disk, select a suitable microscope to observe the indentation size, and determine the hardness value of the NdFeB blank.

[0018] S4. Use a flaw detector to detect whether there are defects inside the NdFeB blank, and use a microscope to observe whether there are flaws on the surface of the NdFeB blank. Finally, combine the test results to evaluate whether the quality of the NdFeB blank meets the standards, and display the parameters of the current NdFeB blank after hardness test on the parameter display screen.

[0019] The present invention has the following advantages:

[0020] 1. The present invention can adapt to sintered NdFeB blanks of different compositions, shapes and sizes through adjustable clamps and replaceable extrusion contacts, thereby expanding the application range of the equipment. The hardness of the NdFeB blanks can be simultaneously tested at multiple points through multiple hardness testing mechanisms, thereby achieving comprehensive and efficient testing of the NdFeB blanks.

[0021] 2. The present invention can observe the surface and interior of the NdFeB blank before or after hardness testing through auxiliary testing components such as a microscope and a flaw detector, so as to promptly discover possible defects and provide a more comprehensive evaluation of product quality.

[0022] 3. The present invention can also ensure the accuracy of the rotation of the detection switching disk through the worm gear and worm gear. At the same time, the self-locking characteristics of the worm gear cooperate with the locking mechanism of the spline block and the card block to ensure the stability of the extruded contact during the detection process, thereby improving the reliability of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0024] Figure 2 This is a diagram showing the connection relationship among the base plate, cylinder, mounting frame, clamping member and other components of the present invention.

[0025] Figure 3 It is a schematic diagram of the bottom plate, guide seat, support plate and clamping member of the present invention.

[0026] Figure 4 It is a three-dimensional structural schematic diagram of a specific component of the clamping piece of the present invention.

[0027] Figure 5 This is a connection diagram of the mounting frame, the sliding frame, the detection switching disk and the hydraulic cylinder of the present invention.

[0028] Figure 6 It is a schematic diagram of the matching relationship of the specific components of the hardness testing mechanism of the present invention.

[0029] Figure 7 It is a schematic diagram of the electric slide rail, probe, ultrasonic signal display and other components of the present invention.

[0030] Figure 8 The figure is a connection diagram of the flaw detector, electric slide rail, slider and probe of the present invention.

[0031] Fig. 9 It is a three-dimensional structural schematic diagram of specific components of the rotating part of the present invention.

[0032] The meanings of the reference numerals in the figure are as follows: 1: base plate, 100: NdFeB blank, 2: cylinder, 3: mounting frame, 4: guide seat, 41: threaded seat, 42: fixed block, 5: support plate, 6: movable block, 61: adjusting screw rod, 7: clamping member, 71: mounting block, 72: first semicircular block, 73: second semicircular block, 74: buffer pad, 8: hardness detection mechanism, 81: sliding frame, 82: detection switching disk, 821: mounting cylinder, 822: extrusion contact, 823: pressure sensor, 82 4: microscope observation mirror, 83: hydraulic cylinder, 84: parameter display screen, 9: driving part, 91: worm gear, 92: first motor, 93: worm, 94: coupling, 101: spline block, 102: electric push rod, 103: clamping block, 11: flaw detector, 111: electric slide rail, 112: slider, 113: probe, 114: ultrasonic signal display, 115: wire, 12: rotating part, 121: disc, 122: guide rail, 123: second motor, 13: electric suction cup. DETAILED DESCRIPTION

[0033] Reference to an embodiment herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] Embodiment 1: A hardness detection device for sintered NdFeB, such as Figure 2-Figure 6As shown, it includes a base plate 1, a cylinder 2 and a mounting frame 3. The base plate 1 is a load-bearing carrier of the detection device. A plurality of cylinders 2 are fixedly mounted on the base plate 1. The mounting frame 3 is a square frame and is fixedly mounted on the telescopic rods of the plurality of cylinders 2. It also includes: a guide seat 4, which is fixedly mounted on the top surface of the base plate 1. A slide groove is provided in the middle of the guide seat 4. A threaded seat 41 is fixedly provided at one end of the guide seat 4. A fixed block 42 is fixedly provided at the other end of the guide seat 4; a support plate 5, which is slidably mounted in the slide groove of the guide seat 4. The support plate 5 is used to place the NdFeB blank 100 to be tested; a movable block 6, which is slidably mounted on the top surface of the guide seat 4; an adjusting screw 61, which is threaded through the threaded seat 41 and then rotatably mounted on the movable block 6; a clamp Parts 7 are respectively arranged on the opposite side of the fixed block 42 and the sliding block. The two clamping parts 7 are used to adapt and clamp NdFeB blanks 100 of different shapes. The clamping part 7 includes a mounting block 71, a first semicircular block 72, a second semicircular block 73 and a buffer pad 74. The mounting block 71 is fixed to the opposite side of the fixed block 42 and the sliding block. The mounting block 71 is rotatably mounted on the first semicircular block 72 through two semicircular grooves. The first semicircular block 72 is also provided with two semicircular grooves. The second semicircular block 73 is rotatably mounted in the semicircular groove of the first semicircular block 72 in a group of two. A buffer pad 74 is provided on the clamping surface of the second semicircular block 73; a hardness detection mechanism 8 is provided with four groups and circumferentially arranged on the four sides of the mounting frame 3 The hardness detection mechanism 8 includes: a sliding frame 81, which is slidably mounted inside the frame of the mounting frame 3; a detection switching disk 82, which is rotatably arranged on the side of the sliding frame 81 close to the NdFeB blank 100; a mounting cylinder 821, which is provided with a plurality of and circumferentially fixed on the side wall of the detection switching disk 82, and there is a certain interval between adjacent mounting cylinders 821; an extrusion contact 822, which is provided with a variety of specifications and is circumferentially arranged on the detection switching disk 82 through the mounting cylinder 821; a pressure sensor 823, which is arranged between the mounting cylinder 821 and the extrusion contact 822; a hydraulic cylinder 83, the number of which is the same as that of the sliding frame 81 and is respectively fixed on the side walls of the four sides of the mounting frame 3, and the telescopic rod of the hydraulic cylinder 83 passes through the mounting frame 3 After that, it is connected to the corresponding sliding frame 81; the driving member 9 is arranged on the sliding frame 81, and the driving member 9 is used to drive the detection switching disk 82 to switch the extrusion contacts 822 of different specifications. After the clamping member 7 stably clamps the NdFeB billet 100 to be detected, according to the current composition of the sintered NdFeB billet 100, the detection switching disk 82 is driven by the driving member 9 to switch the appropriate extrusion contact 822, and then the sliding frame 81 is synchronously moved inward by multiple hydraulic cylinders 83 circumferentially of the mounting frame 3, and synchronously squeezed on the NdFeB billet 100 from multiple directions, and the hydraulic cylinder 83 can be controlled to output different pressures to detect the hardness of the NdFeB billet 100, so as to evaluate whether the quality of the NdFeB billet 100 meets the standards.

[0035] like Figure 5 and Figure 6As shown, the extrusion end of the extrusion contact 822 is a pressure head of various shapes (circular or conical), and the extrusion contact 822 is detachably installed in the installation tube 821. The extrusion contact 822 can be replaced with different materials (diamond or alloy) according to the hardness test of the current NdFeB blank 100, so that the detection device can adapt to the detection of NdFeB blanks 100 with different hardnesses; microscopes 824 are installed between adjacent extrusion contacts 822 on the detection switching disk 82, and the extrusion contacts 822 and the microscopes 824 are evenly spaced. The microscope 824 is used to observe the size of the surface indentation of the NdFeB blank 100 after being compressed, so as to determine the hardness of the NdFeB blank 100. A parameter display screen 84 is installed on the bottom plate 1, and the parameter display screen 84 is used to display various parameters of the current NdFeB blank 100 after hardness testing.

[0036] like Figure 2 , Figure 5 and Figure 6 As shown, the driving member 9 includes: a worm wheel 91, which is fixedly connected to the rotating shaft of the detection switching disk 82; a first motor 92, which is fixedly installed on the sliding frame 81; and a worm 93, which is installed on the output shaft of the first motor 92 through a coupling 94. The worm wheel 91 and the worm 93 are meshed with each other. The first motor 92 drives the worm 93 to rotate through the coupling 94. The rotating worm 93 meshes with the worm wheel 91 and drives the detection switching disk 82 to rotate, so that the extrusion contact 822 on the detection switching disk 82 can be flexibly switched. At the same time, the worm wheel 91 is self-locked by the worm 93, so that the extrusion contact 822 with the detection angle adjusted cannot be easily rotated, thereby improving the stability of the device during hardness detection.

[0037] like Figure 6 As shown, a spline block 101 is fixedly connected to the bottom of the rotating shaft of the detection switching disk 82, and a circle of slots are arranged on the circumferential side wall of the spline block 101. The slots of the spline block 101 are pointed cone slots from outside to inside. An electric push rod 102 is fixedly arranged at the bottom of the sliding frame 81, and a block 103 is installed on the telescopic rod of the electric push rod 102. The block 103 is a wedge-shaped block adapted to the slot of the spline block 101. The electric push rod 102 is inserted into the slot of the spline block 101 through the block 103, thereby locking the detection switching disk 82, thereby further improving the stability of the extruded contact 822 or the microscope 824 on the detection switching disk 82 after rotation switching.

[0038] When using the present device to perform hardness testing on sintered NdFeB blank 100, the operator first places the NdFeB blank 100 to be tested on the support plate 5, and then drives the movable block 6 on the guide seat 4 toward the fixed block 42 by twisting the adjusting screw 61, adjusting the screw 61 thread to fit the threaded seat 41, so that the two clamps 7 gradually approach the NdFeB blank 100. As the distance between the clamps 7 decreases, the first semicircular block 72 and the second semicircular block 73 will automatically adjust the angle according to the shape of the NdFeB blank 100, and fit the outer wall of the NdFeB blank 100 through the buffer pad 74 on the second semicircular block 73, and finally tightly wrap and limit the NdFeB blank 100, ensuring that the NdFeB blank 100 is firmly clamped while maximizing the limit In order to reduce the potential damage to the NdFeB blank 100, after the NdFeB blank 100 is stably limited by the clamping members 7 at two places, the mounting frame 3 is first driven to rise and fall by the cylinder 2, so that the hardness detection mechanism 8 on the mounting frame 3 is adjusted to a detection height suitable for the current NdFeB blank 100, and then the extrusion contact 822 of appropriate specifications and materials is selected according to the composition and shape size of the NdFeB blank 100, and the required extrusion contact 822 is stably installed inside the mounting cylinder 821 of the detection switching disk 82, and then the first motor 92 is activated, and the first motor 92 drives the worm 93 to rotate through the coupling 94, and the rotating worm 93 drives the detection switching disk 82 to rotate and switch different extrusion contacts 822 through the meshing worm wheel 91. When the detection switching disk 82 After switching to the appropriate extrusion contact 822, the first motor 92 is turned off and the electric push rod 102 is enabled at the same time. The electric push rod 102 drives the card block 103 to be inserted into the card slot on the side wall of the current spline block 101 through the telescopic rod, so that the card block 103 is locked on the spline block 101, and the self-locking function between the worm 93 and the worm wheel 91 is cooperated to prevent the selected extrusion contact 822 from accidentally rotating during operation. Then, the four hydraulic cylinders 83 on the installation frame 3 are synchronously enabled. The hydraulic cylinders 83 at various locations act synchronously and push the corresponding connecting frame toward the NdFeB blank 100 through the telescopic rod, so that the extrusion contact 822 on the detection switching disk 82 applies pressure to the NdFeB blank 100 from four directions at the same time. During this period, the pressure sensor in each installation cylinder 821 The sensor 823 is used to monitor the pressure value of the extrusion contact 822 on the NdFeB blank 100, and transmit the data to the parameter display screen 84, so that the operator can intuitively monitor the entire detection process of the NdFeB blank 100, and accurately control the hydraulic cylinder 83 to apply a suitable test pressure to the NdFeB blank 100. After the pressure is applied, the worm 93 is driven by the first motor 92 to rotate the meshing worm gear 91 again, so that the detection switching disk 82 switches to the nearest microscope 824, and the hydraulic cylinder 83 is used to adjust the distance between the microscope 824 and the NdFeB blank 100. The microscope 824 can be used to carefully observe the size of the indentation on the surface of the NdFeB blank 100 after the pressure is applied, so as to determine the hardness value of the NdFeB blank 100.At the same time, the microscopic observation mirror 824 can be used to observe the cracks and other minor defects that may appear on the surface of the NdFeB blank 100, so as to more accurately judge the performance of the NdFeB blank 100.

[0039] Embodiment 2: Based on embodiment 1, Figure 1 , Figure 7 and Figure 8 As shown, a flaw detector 11 is provided on one side of the inner wall of the mounting frame 3, and the flaw detector 11 is used to detect whether there are defects such as cracks inside the NdFeB blank 100 before and after the hardness test. The flaw detector 11 includes: an electric slide rail 111, which is fixedly connected to one side of the inner wall of the mounting frame 3; a slider 112, which is slidably mounted on the electric slide rail 111; a probe 113, which is mounted on the slider 112, and the probe 113 is used to emit ultrasonic waves for detection to the NdFeB blank 100; an ultrasonic signal display 114, which is mounted on the bottom plate 1, and the ultrasonic signal display 114 is electrically connected to the probe 113 through a wire 115, and the ultrasonic signal display 114 is used to intuitively display the ultrasonic image signal generated when the probe 113 detects the NdFeB blank 100, so that the operator can judge whether there are defects inside the NdFeB blank 100 and the location of the defects according to the image or data.

[0040] like Figure 7 and Fig. 9 As shown, a circular groove is provided inside the support plate 5, and a rotating member 12 is provided in the circular groove of the support plate 5. The rotating member 12 includes a disc 121, a guide rail 122 and a second motor 123. The disc 121 is rotatably installed in the circular groove of the support plate 5. The top surface of the disc 121 and the support plate 5 are flush. A guide rail 122 is provided at the bottom of the guide seat 4 on the bottom plate 1. The second motor 123 is slidably installed on the guide rail 122. The output shaft of the second motor 123 is connected to the rotation center of the disc 121. The second motor 123 is used to drive the disc 121 to rotate, so that the disc 121 can drive the NdFeB blank 100 placed on the support plate 5 to rotate, so that the NdFeB blank 100 can rotate to change different hardness detection points and surface defect observation points, thereby improving the detection efficiency of the NdFeB blank 100.

[0041] like Figure 7 and Fig. 9 As shown, an electric suction cup 13 is provided at the rotation center of the disc 121, and the suction cup surface of the electric suction cup 13 is flush with the supporting top surface of the disc 121, thereby improving the stability of the NdFeB blank 100 placed on the support plate 5 and the disc 121 and avoiding the risk of the NdFeB blank 100 tipping over during hardness testing.

[0042] When the NdFeB blank 100 is placed on the support plate 5, by activating the electric suction cup 13, the electric suction cup 13 can firmly adsorb the NdFeB blank 100 on the disc 121, ensuring that the NdFeB blank 100 will not be displaced or tipped over during the hardness detection operation. In order to further verify the quality condition inside the NdFeB blank 100, by activating the second motor 123 and the flaw detector 11, the output shaft of the second motor 123 drives the NdFeB blank 100 on the disc 121 to rotate, and at the same time controls the slider 112 on the electric slide rail 111 to move, thereby adjusting the detection distance between the probe 113 and the NdFeB blank 100, so that the probe 113 can cover a larger detection range. The probe 113 emits ultrasonic waves for detection to the NdFeB blank 100. These ultrasonic waves will penetrate the NdFeB blank 100 and be reflected back when encountering internal structural changes (such as cracks or other defects). The reflected ultrasonic signals are transmitted to the ultrasonic signal display 114 through the wire 115. The ultrasonic signal display 114 intuitively reflects the internal structure of the NdFeB blank 100 through a graphical interface. This dynamic detection method can more accurately capture possible internal defects, especially for subtle cracks or delamination problems that are difficult to directly observe on the NdFeB blank 100, thereby helping operators to more comprehensively understand and evaluate whether the current quality of the NdFeB blank 100 meets the standards.

[0043] A method for testing the hardness of sintered NdFeB, the specific steps are as follows:

[0044] S1, placing the NdFeB blank 100 to be tested on the support plate 5, using the clamping member 7 to adaptively fit and firmly clamp the NdFeB blank 100 of different shapes, starting the second motor 123 to rotate the disc 121 to adjust the position of the NdFeB blank 100, and using the electric suction cup 13 to absorb the NdFeB blank 100 placed on the support plate 5;

[0045] S2. According to the specific composition, shape and size of the NdFeB blank 100, the driver 9 is used to rotate the detection switching disk 82, and the extrusion contact 822 of suitable specifications and materials is selected, and then the hydraulic cylinders 83 on the four sides of the mounting frame 3 are synchronously operated to move the sliding frame 81 inward, so that the selected extrusion contact 822 applies the required pressure for hardness detection to the NdFeB blank 100 from multiple directions synchronously, and the pressure value applied to the NdFeB blank 100 is observed and controlled by the pressure sensor 823;

[0046] S3, operate the hydraulic cylinders 83 on the four sides of the mounting frame 3 to move the sliding frame 81 outward, use the driving member 9 to rotate the detection switching disk 82, select a suitable microscope 824 to observe the indentation size, and determine the hardness value of the NdFeB blank 100;

[0047] S4. Use the flaw detector 11 to detect whether there are defects inside the NdFeB blank 100, and use the microscope 824 to observe whether there are flaws on the surface of the NdFeB blank 100. Finally, combine the test results to evaluate whether the quality of the NdFeB blank 100 meets the standards, and display the parameters of the current NdFeB blank 100 after hardness test on the parameter display screen 84.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A hardness detection device for sintered NdFeB, comprising a base plate (1), a cylinder (2) and a mounting frame (3), wherein a plurality of cylinders (2) are fixedly mounted on the base plate (1), and the mounting frame (3) is fixedly mounted on telescopic rods of the plurality of cylinders (2); Its characteristic is that include: A guide seat (4) is fixedly mounted on the top surface of the bottom plate (1), a slide groove is provided in the middle of the guide seat (4), a threaded seat (41) is fixedly mounted on one end of the guide seat (4), and a fixing block (42) is fixedly mounted on the other end of the guide seat (4); A support plate (5) is slidably mounted in a slide groove of the guide seat (4); A movable block (6) is slidably disposed on the top surface of the guide seat (4); An adjusting screw rod (61) having a thread passing through the threaded seat (41) and then being rotatably mounted on the movable block (6); A clamping member (7) is respectively arranged on the side opposite to the fixed block (42) and the sliding block, the clamping member (7) comprises a mounting block (71), a first semicircular block (72), a second semicircular block (73) and a buffer pad (74), the mounting block (71) is fixedly connected to the side opposite to the fixed block (42) and the sliding block, the mounting block (71) is rotatably mounted on the first semicircular block (72) through two semicircular grooves, the first semicircular block (72) is also provided with two semicircular grooves, the second semicircular blocks (73) are rotatably mounted in the semicircular grooves of the first semicircular block (72) in groups of two, and a buffer pad (74) is provided on the clamping surface of the second semicircular block (73); The hardness detection mechanism (8) is provided with four groups and is circumferentially arranged at four sides of the installation frame (3). The hardness detection mechanism (8) comprises: A sliding frame (81) slidably mounted inside the frame of the mounting frame (3); A detection switching disk (82) is rotatably disposed on a side of the sliding frame (81) close to the NdFeB blank (100); A plurality of mounting cylinders (821) are provided and fixedly mounted on the side wall of the detection switching disk (82) at circumferential intervals; A pressing contact (822) is circumferentially arranged on the detection switching disk (82) via a mounting cylinder (821); A pressure sensor (823) is arranged between the mounting cylinder (821) and the extrusion contact (822); The hydraulic cylinders (83) are the same in number as the sliding frames (81) and are respectively fixed on the side walls of the four sides of the installation frame (3); the telescopic rods of the hydraulic cylinders (83) penetrate the installation frame (3) and are connected to the corresponding sliding frames (81); A driving member (9) is arranged on the sliding frame (81), and the driving member (9) is used to drive the detection switching disk (82) to switch between extrusion contacts (822) of different specifications.

2. A hardness detection device for sintered NdFeB according to claim 1, characterized in that: The extrusion contacts (822) are all detachably mounted in the mounting cylinder (821).

3. A hardness detection device for sintered NdFeB according to claim 2, characterized in that: Microscopes (824) are installed between adjacent squeeze contacts (822) on the detection switching disk (82); the squeeze contacts (822) and the microscopes (824) are evenly spaced and distributed; and a parameter display screen (84) is installed on the bottom plate (1).

4. A hardness detection device for sintered NdFeB according to claim 3, characterized in that: The driving member (9) comprises: A worm gear (91) is fixedly connected to the rotating shaft of the detection switching disk (82); A first motor (92) is fixedly mounted on the sliding frame (81); A worm (93), wherein the worm (93) is mounted on an output shaft of the first motor (92) via a coupling (94), and the worm wheel (91) and the worm (93) are meshed with each other.

5. A hardness detection device for sintered NdFeB according to claim 4, characterized in that: A spline block (101) is fixedly connected to the bottom of the rotating shaft of the detection switching disk (82), and a circle of slots are arranged at intervals on the circumferential side wall of the spline block (101), and the slots of the spline block (101) are pointed cone slots extending from the outside to the inside. An electric push rod (102) is fixedly arranged at the bottom of the sliding frame (81), and a block (103) is installed on the telescopic rod of the electric push rod (102), and the block (103) is a wedge-shaped block adapted to the slot of the spline block (101).

6. A hardness detection device for sintered NdFeB according to claim 5, characterized in that: A flaw detector (11) is provided on one side of the inner wall of the installation frame (3), and the flaw detector (11) is used to detect whether there are crack defects inside the NdFeB blank (100) before and after hardness testing. The flaw detector (11) comprises: An electric slide rail (111) fixedly connected to one side of the inner wall of the installation frame (3); A slider (112) slidably mounted on the electric slide rail (111); A probe (113) is mounted on the slider (112), and the probe (113) is used to emit ultrasonic waves for detection to the NdFeB blank (100); An ultrasonic signal display (114) is mounted on the base plate (1), and the ultrasonic signal display (114) is electrically connected to the probe (113) via a wire (115).

7. A hardness detection device for sintered NdFeB according to claim 6, characterized in that: A circular groove is provided inside the support plate (5), a rotating member (12) is provided in the circular groove of the support plate (5), the rotating member (12) comprises a disc (121), a guide rail (122) and a second motor (123), the disc (121) is rotatably mounted in the circular groove of the support plate (5), the top surfaces of the disc (121) and the support plate (5) are flush, the guide rail (122) is provided on the bottom plate (1) at the bottom of the guide seat (4), the second motor (123) is slidably mounted on the guide rail (122), and the output shaft of the second motor (123) is connected to the rotation center of the disc (121).

8. A hardness detection device for sintered NdFeB according to claim 7, characterized in that: An electric suction cup (13) is arranged at the rotation center of the circular disc (121), and a suction cup surface of the electric suction cup (13) is flush with a supporting top surface of the circular disc (121).

9. A method for testing the hardness of sintered NdFeB, using the hardness testing device for sintered NdFeB as claimed in claim 8, characterized in that: The specific steps are as follows: S1, placing the NdFeB blank (100) to be tested on the support plate (5), adaptively fitting and firmly clamping the NdFeB blank (100) of different shapes by the clamping member (7), starting the second motor (123) to rotate the disc (121) to adjust the position of the NdFeB blank (100), and using the electric suction cup (13) to absorb the NdFeB blank (100) placed on the support plate (5); S2. According to the specific composition, shape and size of the NdFeB blank (100), the detection switching disk (82) is rotated by using the driving member (9), and a squeeze contact (822) of suitable specifications and materials is selected, and then the hydraulic cylinders (83) on the four sides of the mounting frame (3) are synchronously operated to move the sliding frame (81) inward, so that the selected squeeze contact (822) synchronously applies the pressure required for hardness detection to the NdFeB blank (100) from multiple directions, and the pressure value applied to the NdFeB blank (100) is observed and controlled by the pressure sensor (823); S3, operate the hydraulic cylinders (83) on the four sides of the mounting frame (3) to move the sliding frame (81) outward, use the driving member (9) to rotate the detection switching disk (82), select a suitable microscope (824) to observe the size of the indentation, and determine the hardness value of the NdFeB blank (100).

10. A method for testing the hardness of sintered NdFeB according to claim 9, characterized in that: The following steps are also included: S4. Use a flaw detector (11) to detect whether there are defects inside the NdFeB blank (100), and use a microscope (824) to observe whether there are flaws on the surface of the NdFeB blank (100). Finally, combine the test results to evaluate whether the quality of the NdFeB blank (100) meets the standard, and display the parameters of the current NdFeB blank (100) after hardness test on the parameter display screen (84).

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