Special-shaped nd-fe-b magnetic steel fine grinding positioning clamp

Abstract

The utility model relates to positioning fixture technical field more specifically is special -shaped nd -Fe-B magnetic steel fine grinding positioning fixture. Including pedestal, the upper end of pedestal is fixed with first boss, the upper sliding connection has second boss, is provided with first screw hole on the pedestal, screws in the first screw hole, the upper rotation of screw rod is connected with connecting piece, and the lower end of connecting piece is fixed with second boss. Still include additional head, and additional head can detachable connection in first boss and second boss. Additional head has at least two surfaces and first boss or second boss contact, and the clamping surface of additional head is circular arc surface. The purpose is that the normal planar clamping scheme can be changed through the mode of adding additional part.

Description

Technical Field

[0001] This utility model relates to the field of positioning fixture technology, and more specifically to a precision-ground positioning fixture made of irregularly shaped neodymium iron boron magnets. Background Technology

[0002] Due to their unique magnetic properties, irregularly shaped neodymium iron boron magnets are widely used in electronics, machinery, new energy, and other fields. During their production and processing, the precision grinding process demands extremely high positioning accuracy and stability, directly affecting the dimensional accuracy and surface quality of the magnets.

[0003] In the existing technology, the positioning clamps for irregularly shaped NdFeB magnets need to be improved, as they cannot be adapted to the clamping surfaces of magnets of different shapes; secondly, there is a lack of targeted bottom support; and thirdly, the contact area between the clamp and the magnet is usually small, resulting in concentrated pressure and easy scratches on the magnet surface during clamping.

[0004] Therefore, there is an urgent need for a precision-ground positioning fixture for irregularly shaped neodymium iron boron magnets that is highly adjustable, adaptable, stable in clamping, and can protect the workpiece, in order to overcome the shortcomings of existing technologies. Utility Model Content

[0005] This utility model provides a precision-ground positioning fixture for irregularly shaped neodymium iron boron magnets, the purpose of which is to change the conventional planar clamping solution by adding additional components.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A precision-ground positioning fixture for irregularly shaped neodymium iron boron magnets includes a base, a first boss fixedly connected to the upper end of the base, a second boss slidably connected to the upper end, a first threaded hole provided on the base, a screw screwed into the first threaded hole, a connector rotatably connected to the screw, and the connector fixedly connected to the lower end of the second boss.

[0008] The first boss and the second boss are at the same height, and the faces of the first boss and the second boss that are facing each other are perpendicular.

[0009] The axis of the screw is parallel to the direction of movement of the second boss, and rotating the screw is used to adjust the distance between the second boss and the first boss.

[0010] The screw has two slots, each holding two retaining springs, and the connector is located between the two retaining springs.

[0011] The end of the screw near the first boss does not protrude beyond the second boss.

[0012] The platform is provided with a guide groove, the extension direction of which is parallel to the movement direction of the second boss, and a slider is fixedly connected to the second boss and slidably connected in the guide groove.

[0013] The pedestal has a frame-like structure. A frustum is fixed to the inner wall of the pedestal. The bottom of the frustum is higher than the bottom of the pedestal. A base is installed inside the pedestal to be inserted below the frustum. An attachment is fixed to the upper end of the base. The attachment is columnar.

[0014] A second threaded hole is provided on the prism, and a threaded fastener that abuts against the base is screwed into the second threaded hole.

[0015] It also includes an additional head that can be detachably connected to the first boss and the second boss.

[0016] The attachment head has at least two surfaces that contact the first or second boss, and the clamping surface of the attachment head is an arc surface.

[0017] The beneficial effects of this novel precision-ground positioning fixture for irregularly shaped NdFeB magnets are as follows:

[0018] By connecting the screw to the base with a threaded connection and combining the connecting piece with the fixed structure of the second boss, the distance between the second boss and the first boss can be precisely adjusted by rotating the screw. The adjustment process is smooth and controllable. The sliding cooperation between the guide groove and the slider ensures the stability of the movement direction of the second boss, avoids deviation during the adjustment process, and further improves the positioning accuracy.

[0019] The detachable attachment head design allows for flexible replacement according to the shape of irregular magnets. Its arc-shaped clamping structure can be adapted to magnets with cylindrical or arc-shaped contours. With the vertical clamping surfaces of the first and second protrusions, it can meet the clamping requirements of various irregular magnets such as flat and arc surfaces, significantly improving the versatility of the clamp.

[0020] The mating structure between the bottom frustum and the base can temporarily position the base with threaded fasteners, providing reliable bottom support for the magnets, and changing the shape of the base to adapt to workpieces of different shapes. Attached Figure Description

[0021] Figure 1 Schematic diagram of the overall structure of the precision-ground positioning fixture for irregularly shaped NdFeB magnets Figure 1 ;

[0022] Figure 2 Schematic diagram of the overall structure of the precision-ground positioning fixture for irregularly shaped NdFeB magnets Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the pedestal structure;

[0024] Figure 4 This is a schematic diagram showing the positional relationship between the screw with a handle and the connector.

[0025] Figure 5 This is a schematic diagram of the card slot structure.

[0026] In the diagram: 1-1, base; 1-2, first boss; 1-3, guide groove; 1-4, first threaded hole; 1-5, frustum; 1-6, second threaded hole; 2-1, second boss; 2-2, slider; 2-3, additional head; 3-1, screw; 3-2, connector; 3-3, slot; 3-4, snap ring; 4-1, base; 4-2, additional part. Detailed Implementation

[0027] A precision-ground positioning fixture for irregularly shaped NdFeB magnets includes a base 1-1. The central area of ​​the base 1-1 has a hollow structure to provide space for the movement of other parts and for the placement of the magnets. For example, the base 1-1 may have a frame-like structure.

[0028] The upper right end of the base 1-1 is integrally formed with a first boss 1-2. Both the front and rear ends of the base 1-1 are provided with guide grooves 1-3 extending in the left-right direction. A slider 2-2 is fixed to each of the front and rear ends of the second boss 2-1. The two sliders 2-2 are slidably connected within the two guide grooves 1-3, allowing the second boss 2-1 to slide left and right to approach or move away from the first boss 1-2. Depending on processing costs, the guide grooves 1-3 can be reduced or eliminated, but the lower end face of the second boss 2-1 must be level with the upper end face of the base 1-1 and maintain overlap to achieve surface contact.

[0029] The base 1-1 is provided with a first threaded hole 1-4. Through the engagement of the threads, the screw 3-1 is screwed into the first threaded hole 1-4, and the screw 3-1 is fed or retracted by rotation.

[0030] The threaded joint structure, where the screw and the threaded hole mesh, maintains relative stillness and prevents automatic loosening. Essentially, the static friction torque between the threaded contact surfaces is greater than or equal to the torque caused by axial force that would loosen the thread. Specifically, the helix angle of the screw 3-1 and the first threaded hole 1-4 must be less than or equal to the equivalent friction angle between their contact surfaces. When the helix angle does not exceed the equivalent friction angle, the threaded joint will not automatically loosen under axial force, thus achieving self-locking. Common triangular threads, such as ordinary threads, have a larger tooth profile angle and a larger equivalent friction angle, making it easier to meet the self-locking condition compared to rectangular threads. The tooth profile angle of triangular threads is typically 60°, which increases the friction between the threaded contact surfaces, thus aiding in self-locking.

[0031] The right side of the screw 3-1 is not threaded, in order to reduce friction when it is rotatably connected with the connector 3-2. The connector 3-2 is fixedly connected to the lower end of the second boss 2-1.

[0032] The right end of the screw 3-1 is located on the left side of the right end face of the second boss 2-1, and the left end of the screw 3-1 is fixed to the handle. The base 1-1 is provided with a mounting hole for the tail of the bolt to pass through from top to bottom and screw into the threaded hole of the mounting surface.

[0033] The rotatable connection between the screw 3-1 and the connector 3-2 can be achieved by adding a bearing. This fixes the inner ring of the bearing to the screw 3-1 and the outer ring to the connector 3-2. Alternatively, a detachable design can be used: two slots 3-3 are provided on the right side of the screw 3-1, each holding a retaining spring 3-4. The connector 3-2 is located between the two retaining springs 3-4. Although the connector 3-2 is in contact with the two retaining springs 3-4, there is sliding friction between them, allowing relative rotation. This design allows the position of the second boss 2-1 to be adjusted by rotating the screw 3-1, thereby changing the distance between the second boss 2-1 and the first boss 1-2. The second boss 2-1 and the first boss 1-2 are used to clamp the irregularly shaped NdFeB magnet.

[0034] Regarding the optimization of the positioning solution:

[0035] Firstly, the first boss 1-2 and the second boss 2-1 are at the same height, and the faces of the first boss 1-2 and the second boss 2-1 that face each other are perpendicular. This allows the first boss 1-2 and the second boss 2-1 to clamp and position two symmetrical surfaces.

[0036] Secondly, it also includes two additional heads 2-3, which are selectively mounted on the first boss 1-2 and / or the second boss 2-1 as accessories. For example, the facing surfaces of the two additional heads 2-3 are both arc surfaces, used to clamp neodymium iron boron magnets with cylindrical surfaces. Different shapes of neodymium iron boron magnets can be adapted by changing the shape of the additional heads 2-3.

[0037] The attachment head 2-3 has a right-angled surface to fit onto the first boss 1-2 or the second boss 2-1, and is fixed onto the first boss 1-2 or the second boss 2-1 by screws.

[0038] Thirdly, a frustum 1-5 extending in the left and right direction is fixedly connected to the inner wall of the base 1-1. The bottom of the frustum 1-5 is higher than the bottom of the base 1-1 so that a slot is formed between the plane supporting the base 1-1 and the frustum 1-5. A base 4-1 is provided inside the base 1-1 and inserted into the slot. An attachment 4-2 is fixedly connected to the upper end of the base 4-1. The attachment 4-2 is used to support the bottom of the irregular neodymium iron boron magnet for precision grinding. When the attachment 4-2 is columnar, it can be inserted into the irregular neodymium iron boron magnet with a cylindrical groove.

[0039] The frustum 1-5 is provided with a second threaded hole 1-6, into which a threaded fastener, such as a flat-tail or self-tapping screw, is screwed against or screwed into the base 4-1. The thickness of the base 4-1 is less than the height of the slot, which facilitates the tilted insertion of the base 4-1 into the slot or the tilted misalignment removal from the slot.

[0040] Among them, the base 1-1, the first boss 1-2, the second boss 2-1, the additional head 2-3 and the attachment 4-2 are made of aluminum alloy, brass or engineering plastic, and the face-to-face side of the additional head 2-3 is made by impregnation or by attaching an inherent rubber anti-slip layer.

Claims

1. A precision-ground positioning fixture for irregularly shaped NdFeB magnets, comprising a base, a first boss fixedly connected to the upper end of the base, a second boss slidably connected to the upper end, a first threaded hole provided on the base, a screw screwed into the first threaded hole, and a connecting piece rotatably connected to the screw; characterized in that... The connector is fixedly connected to the lower end of the second boss; it also includes an additional head that can be detachably connected to the first boss and the second boss.

2. The precision-ground positioning fixture for irregularly shaped NdFeB magnets according to claim 1, characterized in that, The first boss and the second boss are at the same height, and the faces of the first boss and the second boss that are facing each other are perpendicular.

3. The precision-ground positioning fixture for irregularly shaped NdFeB magnets according to claim 1, characterized in that, The axis of the screw is parallel to the direction of movement of the second boss, and rotating the screw is used to adjust the distance between the second boss and the first boss.

4. The precision-ground positioning fixture for irregularly shaped NdFeB magnets according to claim 1, characterized in that, The screw has two slots, each holding two retaining rings, and the connector is located between the two retaining rings.

5. The precision-ground positioning fixture for irregularly shaped NdFeB magnets according to claim 1, characterized in that, The end of the screw near the first boss does not protrude beyond the second boss.

6. The precision-ground positioning fixture for irregularly shaped NdFeB magnets according to claim 1, characterized in that, The platform is provided with a guide groove, the extension direction of which is parallel to the movement direction of the second boss, and a slider is fixedly connected to the second boss and slidably connected in the guide groove.

7. The precision-ground positioning fixture for irregularly shaped NdFeB magnets according to claim 1, characterized in that, The pedestal has a frame-like structure. A frustum is fixed to the inner wall of the pedestal. The bottom of the frustum is higher than the bottom of the pedestal. A base is installed inside the pedestal to be inserted below the frustum. An attachment is fixed to the upper end of the base. The attachment is columnar.

8. The precision-ground positioning fixture for irregularly shaped NdFeB magnets according to claim 7, characterized in that, A second threaded hole is provided on the prism, and a threaded fastener that abuts against the base is screwed into the second threaded hole.

9. The precision-ground positioning fixture for irregularly shaped NdFeB magnets according to claim 1, characterized in that, The attachment head has at least two surfaces that contact the first or second boss, and the clamping surface of the attachment head is an arc surface.

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