Neodymium-iron-boron circular ring outer circle grinding inner supporting tool clamp

Abstract

The utility model discloses a neodymium iron boron circular ring outer circle grinding inner support work fixture, which belongs to the field of machining and manufacturing, and comprises a clamping tensioning sleeve, a single inner support top petal, a conical loose core and a pressing end cover, the clamping and tensioning sleeve is a hollow cylinder, and a plurality of notches are evenly distributed in the cylinder wall. The single-body inner supporting top petals are sheet-shaped parts, and notches are formed in the lower portions of the single-body inner supporting top petals and are symmetrical with the middle higher than the two ends; the single-body inner support top valve is mounted in a notch in the tensioning sleeve and can move up and down; the two conical loose cores are columnar parts and are respectively connected into the openings of the clamping and tensioning sleeves in a sliding manner; a thread is arranged at one end of the outer side of the clamping and tensioning sleeve, and a conical surface is arranged at the periphery of one end of the inner side of the clamping and tensioning sleeve and is matched and propped against the notch of the single inner support top petal to form inclined plane fit; the compression end cover can be matched with the conical core-pulling threads, and one side of the end cover abuts against one end of the sleeve; compared with the prior art, quick clamping of the workpiece can be achieved while the machining precision is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the field of mechanical processing and manufacturing, and more specifically relates to a NdFeB ring external cylindrical grinding internal support fixture. Background Art

[0002] When grinding the outer diameter of ring-type products, high precision is required for the outer diameter of the products. Different types of tooling and fixtures are often required for clamping according to the different inner diameter sizes of the processed ring products. Traditional cylindrical interference fit tooling needs to be made according to the different inner diameter sizes of products.

[0003] At present, in the prior art, such as in the Chinese patent application number CN202122037620.0, an internal support fixture is disclosed, in which a bolt is screwed into the core, and a contoured chuck is expanded to match and fix the workpiece. However, the deformation of the contoured chuck is limited. A chuck of one size can only clamp products within a smaller inner diameter range. For products with inner diameters with large size differences, a corresponding type of contoured chuck needs to be customized, resulting in a problem of poor tool versatility. Moreover, the contoured chuck has low precision in matching the inner wall of the product after squeezing and expansion, and is prone to wear, which leads to poor tolerance accuracy in processing straightness, circular runout, etc. The products processed under the clamping of this fixture are prone to product defects such as uneven wall thickness and insufficient precision. In addition, since the interference fit fixture needs to provide a large friction force to ensure that the workpiece does not slip relative to each other during external cylindrical grinding, it is inconvenient to clamp and release the product, affecting processing efficiency. Utility Model Content

[0004] The design purpose of this utility model is to provide a NdFeB ring external cylindrical grinding internal support fixture to address the above problems. It can achieve higher clamping accuracy during external cylindrical grinding of ring-type products, thereby ensuring the processing accuracy of the products and at the same time realize convenient and quick clamping, thereby improving processing efficiency.

[0005] The utility model discloses a NdFeB ring external grinding inner support fixture, which comprises a clamping and tightening sleeve, a single inner support top petal, a conical core pulling device and a pressing end cover.

[0006] The clamping tension sleeve is a hollow cylinder with a number of notches evenly distributed on its wall.

[0007] The top flap of the single inner support is a sheet-like part with a notch on its bottom. The notch is symmetrical, with the middle higher and the ends lower. The top flap of the single inner support is installed in the notch on the tension sleeve and can move up and down.

[0008] Two conical core pullers are cylindrical components that slide into the opening of the clamping sleeve. One end of the core puller, located on the outside of the clamping sleeve, is threaded, while the other end, located on the inside, has a tapered surface that mates with the notch in the top petal of the inner support, forming a beveled fit.

[0009] A screw hole is opened in the center of the compression end cover, which can be matched with the tapered core-pulling thread, and one side of the end cover abuts against one end of the sleeve.

[0010] As a further improvement of the present invention, the present invention further comprises a rubber ring. Mounting openings are provided on both sides of the single inner support top flap. The rubber ring is mounted in the mounting openings on both sides of the single inner support top flap.

[0011] As a further improvement of the utility model, a compression lock nut is further included. The compression lock nut is matched with the tapered core-pulling thread and is abutted against the outer side of the compression end cover to prevent the compression end cover from loosening.

[0012] As a further improvement to the present invention, the left and right end faces of the clamping sleeve are uniformly engraved with end face scale pointers indicating angles. The clamping end cap is cylindrical, and a cap scale pointer is engraved on its cylindrical surface. The cap scale pointer aligns with the end face scale pointer to indicate the rotation angle of the clamping end cap.

[0013] As a further improvement of the present invention, a circular through hole is provided around the central screw hole of the compression end cover for clamping and tightening.

[0014] As a further improvement of the present invention, the top end of the single inner support top petal is rounded, and a rubber pad is attached to the top surface that contacts the inner wall of the annular workpiece to protect the inner wall of the annular workpiece.

[0015] Compared with the existing technology, the beneficial effect of the present invention is that compared with the traditional cylindrical interference fit fixture, the structure with self-centering function can achieve high-precision clamping and positioning of the circular workpiece, and the elastic rubber ring can be used for rapid disassembly and assembly, thereby improving the product clamping efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 This is a cross-sectional diagram of the structure and coordination of the internal parts of the present invention;

[0018] Figure 3 This is a schematic diagram of the working structure of the fixture of the present invention, with the workpiece shown in cross section;

[0019] Description of the numbers in the figure:

[0020] 1. Clamping sleeve; 2. Single internal support top flap; 3. Conical core pulling; 4. Pressing end cover; 5. Elastic rubber ring; 6. Pressing lock nut; 11. Notch; 12. End face scale pointer; 21. Mounting port; 41. End cover scale pointer. DETAILED DESCRIPTION

[0021] Specific embodiment 1: Please refer to the attached figure

[0022] NdFeB ring outer circle grinding inner support fixture, the fixture as a whole is as follows Figure 3 The inner wall of the annular workpiece shown is fitted and clamped.

[0023] A NdFeB ring external cylindrical grinding internal support fixture comprises: a clamping tension sleeve 1, a single internal support top petal 2, a conical core pulling 3 and a pressing end cover 4.

[0024] The clamping and tightening sleeve 1 is a hollow cylinder, and the cylinder body is provided with four notches 11 for installing the single inner support top petal 2, which are symmetrically and evenly arranged.

[0025] The single-piece inner support top flap 2 is a rectangular, sheet-like component with a V-shaped groove on its bottom and mounting openings 21 on either side. The single-piece inner support top flap 2 is installed within the rectangular slot 11 of the tension sleeve 1, allowing for up and down movement within the slot. The slot 11 is designed to have a width equal to the thickness of the single-piece inner support top flap 2, but slightly longer to facilitate its up and down movement without getting stuck.

[0026] The tapered core puller 3 is cylindrical at one end and tapered at the other, with threads on the cylindrical end. As shown in the figure, two tapered core pullers 3 are symmetrically positioned at opposite ends of the center of the clamping sleeve 1. Their tapered ends snap into the V-grooves of the single-piece inner support top flap 2. The V-grooves of the single-piece inner support top flap 2 have the same slope as the tapered surfaces of the tapered core pullers 3, allowing them to fit tightly together in a linear contact pattern.

[0027] The clamping end cap 4 is a cylinder, and one is installed on each side of the tensioning sleeve 1. There is a screw hole in the center, which can be installed with the conical core 3. After installation, its end face fits the end face of the tensioning sleeve 1.

[0028] Instructions: Place the annular workpiece onto the fixture. Secure the tapered core puller 3 with the lathe chuck. Tighten the two compression end caps 4. As the end caps mate and press against the end faces of the tension sleeve 1, the tapered core puller 3, threaded together, extends outward from the barrel. The tapered surface of the tapered core puller 3 mates with the V-shaped slopes of the individual inner support lobes 2, converting the horizontal motion of the tapered core puller 3 into longitudinal motion. Each of the four inner support lobes 2 is ejected outward from the notches 11 in the barrel. When the compression end caps 4 rotate at the same angle, the outward motion of the tapered core puller 3 is also consistent. Because the V-shaped notches in the four inner support lobes 2 are machined to the same dimensions and symmetrically, the extension of the four inner support lobes 2 is also consistent. When the ejection length is sufficient, the annular workpiece is securely supported from the inside, and the fixture maintains a horizontal and coaxial position with the workpiece, achieving low runout error during machining.

[0029] Specific embodiment 2: On the basis of specific embodiment 1, an installation opening 21 is provided at each end of the V-shaped notch of the single-body inner support top petal 2, and an elastic rubber ring 5 can be installed therein after the conical core pulling 3 is installed. When the end cover 4 is tightened and loosened, the elastic force of the elastic rubber ring 5 will retract, and the four blocks of the single-body inner support top petals 2 will be forced to retract inward, leaving the inner wall of the circular workpiece, and the conical core pulling 3 will retract inward from both ends relative to the cylinder body, thereby realizing rapid disassembly of the workpiece.

[0030] Specific embodiment 3: Based on the specific embodiment 2, two compression lock nuts 6 are installed, which are threadedly connected to the cylindrical end of the tapered core 3. After the compression end cap 4 and the tapered core 3 are installed and matched, in order to prevent the threads from loosening due to insufficient engagement during processing, they are installed on the outside of the compression end caps 4 on both sides, and the double nut anti-loosening principle is used to keep them tight.

[0031] Specific embodiment 4: Based on specific embodiment 3, end face scale pointers 12 indicating angles are uniformly engraved on the left and right end faces of the clamping tension sleeve 1, and an end cover scale pointer 41 is engraved on the cylindrical surface of the clamping end cap 4. When locking the workpiece, the end cover scale pointers 41 on both sides of the clamping end cap 4 can cooperate with the end face scale pointers 12 on the end faces of the tension sleeve 1 to control the rotation angle of the clamping end cap 4 on both sides to be the same, thereby ensuring the same extension amount of the tapered core pulling 3 on both sides, thereby achieving horizontal ejection of the single internal support top petal 2.

[0032] Specific embodiment five: On the basis of specific embodiment four, a central through hole is opened around the central screw hole of the compression end cover 4, and the compression end cover 4 can be tightened and loosened with a special wrench to achieve quick clamping.

[0033] Specific embodiment six: On the basis of specific embodiment five, the top end of the single inner support top petal 2 is formed with a rounded corner, and a rubber pad is added to the top surface that contacts the inner wall of the annular workpiece to protect the inner wall of the annular workpiece.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to be limiting. All variations, modifications, and substitutions within the spirit and principles of this design are within the scope of protection of this utility model.

Claims

1. A fixture for the outer cylindrical grinding and inner support of a NdFeB ring, characterized by: It comprises a clamping tension sleeve (1), a single-body inner support top flap (2), a conical core pulling (3) and a pressing end cover (4); The clamping tension sleeve (1) is a hollow cylinder, and a plurality of notches (11) are evenly distributed on the cylinder wall; The single-body inner support top flap (2) is a sheet-like part with a notch at its bottom, and the notch is symmetrically shaped with a high middle and low ends. The single-body inner support top flap (2) is installed in a notch (11) on the clamping tension sleeve (1) and can move up and down. The conical core pulling parts (3) are cylindrical parts, two in number, and one end of which is threaded and slidably connected to the tube mouth of the clamping and tightening sleeve (1); the end of the conical core pulling parts (3) located on the outside of the clamping and tightening sleeve (1) is threaded, and the outer periphery of the end located on the inside of the clamping and tightening sleeve (1) is a conical surface, and is matched with the notch of the single inner support top petal (2) to form an inclined surface fit; The center of the clamping end cover (4) is provided with a screw hole which can be matched with the thread of the tapered core pulling (3), and one side of the end cover is in contact with one end of the clamping tension sleeve (1).

2. The NdFeB ring external grinding inner support fixture according to claim 1, characterized in that: It also includes a rubber ring (5); mounting openings (21) are provided on both sides of the single-body inner support top flap (2); and the rubber ring (5) is mounted in the mounting openings (21) on both sides of the single-body inner support top flap (2).

3. The NdFeB ring external grinding inner support fixture according to claim 1, characterized in that: It also includes a clamping anti-loosening nut (6); the clamping anti-loosening nut (6) is matched with the thread of the conical core pulling (3) and abuts against the outer side of the clamping end cover (4) to prevent the clamping end cover (4) from loosening.

4. The NdFeB ring external grinding inner support fixture according to claim 1, characterized in that: On the left and right end faces of the clamping tension sleeve (1), end face scale pointers (12) indicating angles are evenly engraved; the pressing end cover (4) is cylindrical, and an end cover scale pointer (41) is engraved on its cylindrical surface. The end cover scale pointer (41) is aligned with the end face scale pointer (12) to indicate the rotation angle of the pressing end cover (4).

5. The NdFeB ring external grinding inner support fixture according to claim 1, characterized in that: A circular through hole is provided around the central screw hole of the compression end cover (4) for clamping and tightening.

6. The NdFeB ring external grinding inner support fixture according to claim 1, characterized in that: The top end of the single inner support top petal (2) is formed with a rounded corner, and a rubber pad is attached to the top surface that contacts the inner wall of the circular workpiece to protect the inner wall of the circular workpiece.

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