Outer circle grinding clamp for thin-wall sleeve

Abstract

The utility model provides a thin-wall sleeve cylindrical grinding fixture which comprises a mandrel and a pair of port expansion sleeves, the port expansion sleeves are sleeved at the left end and the right end of the mandrel, center holes are arranged at the left end and the right end of the mandrel, and a plurality of positioning threaded sleeves, a plurality of inner wall expansion sleeves and a plurality of spacer bushes are further sleeved on the mandrel. The inner wall expansion sleeves and the positioning threaded sleeves are arranged in pairs and clamped between every two adjacent spacer bushes, and the spacer bushes are further arranged between the port expansion sleeves and the positioning threaded sleeves. By the adoption of the technical scheme, the position where the inner wall of the workpiece needs to be supported is determined through the positioning threaded sleeve, then the inner wall face of the thin-wall sleeve workpiece is supported through the inner wall expansion sleeve, when the outer circle face of the thin-wall sleeve workpiece is ground, grinding force from a grinding wheel is counteracted by bearing reaction generated by the inner wall expansion sleeve, and therefore the outer circle face of the thin-wall sleeve workpiece is ground. In addition, center holes are formed in the two ends of the mandrel, so that the workpiece and a clamp of the workpiece can be conveniently connected with a main shaft of a grinding machine.

Description

Technical Field

[0001] This utility model belongs to the field of fixture technology, and in particular relates to a thin-walled sleeve outer cylindrical grinding fixture. Background Technology

[0002] Thin-walled sleeve parts are widely used components in various mechanical equipment or devices. When grinding the outer cylindrical surface of such workpieces, in order to prevent the workpiece from deforming during the processing, it is usually necessary to clamp the workpiece. The existing fixtures generally include a pad and a pressure plate, wherein the pad serves as a positioning reference surface, and the workpiece is clamped between the pad and the pressure plate.

[0003] For example, patent document with publication number "CN221270398U" discloses a clamping fixture for thin-walled sleeve workpieces, including a base, a centering plate, a push rod, and a positioning pin. The base is provided with a horizontal guide hole and a vertical guide hole, which intersect perpendicularly and are interconnected. The lower end of the positioning pin is fixed to the edge of the centering plate, and the upper end of the positioning pin extends upward in the vertical direction. The surface of the centering plate is also provided with a centering column, which is fitted into the vertical guide hole. One end of the push rod is set as a wedge surface, and the push rod is fitted into the horizontal guide hole, so that the wedge surface is close to the centering column. Using this patented technology, when force is applied to the push rod, the centering column rises along the inclined wedge surface, allowing the corresponding positioning pins to simultaneously extend into the corresponding positioning holes on the workpiece surface. This achieves synchronous positioning of various points on the workpiece and reduces the form and position errors between the positioning pins. However, when grinding the outer cylindrical surface of the thin-walled sleeve workpiece, the outer cylindrical surface of the workpiece bears the grinding force from the grinding wheel. The thin-walled sleeve workpiece is hollow inside, which makes the thin wall of the workpiece prone to large deformation, affecting the grinding accuracy of the workpiece. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a thin-walled sleeve outer diameter grinding fixture.

[0005] This utility model is achieved through the following technical solution.

[0006] This utility model provides a thin-walled sleeve external cylindrical grinding fixture, including a mandrel and a pair of port expansion sleeves. The port expansion sleeves are fitted onto the left and right ends of the mandrel, and the left and right ends of the mandrel are provided with center holes. The mandrel is also fitted with a plurality of positioning screw sleeves, a plurality of inner wall expansion sleeves and a plurality of spacers. The inner wall expansion sleeves and the positioning screw sleeves are arranged in pairs and clamped between two adjacent spacers. The spacers are also disposed between the port expansion sleeves and the positioning screw sleeves.

[0007] The mandrel is also fitted with a positioning plate and a pressure plate at its left and right ends. The spacer is also positioned between the pressure plate and the inner wall expansion sleeve. The positioning plate is also placed next to one of the port expansion sleeves.

[0008] The surface of the mandrel is also provided with a boss, and the positioning disc is clamped between the boss and the corresponding port expansion sleeve.

[0009] The boss, positioning plate, and corresponding port expansion sleeve are also fixed together by bolts.

[0010] The boss and the mandrel are manufactured as a single piece.

[0011] A pressure ring is also fitted on the mandrel, and the mandrel is also screwed to a locking nut, with the pressure ring clamped between the pressure plate and the locking nut.

[0012] The surface of the pressure plate is also provided with a tenon groove, and at least part of the pressure ring is fitted into the tenon groove.

[0013] The interface between the pressure plate and the locking nut is spherical.

[0014] The beneficial effects of this utility model are as follows: When clamping a thin-walled sleeve using the technical solution of this utility model, the positioning screw sleeve is first used to determine the position where the inner wall of the workpiece needs to be supported, and then the inner wall of the thin-walled sleeve workpiece is supported by the inner wall expansion sleeve. When the outer cylindrical surface of the thin-walled sleeve workpiece is ground, the grinding force from the grinding wheel is offset by the support reaction force generated by the inner wall expansion sleeve, preventing deformation of the thin wall of the workpiece and improving the grinding accuracy of the workpiece. In addition, center holes are provided at both ends of the mandrel, making it easy for the workpiece and its fixture to be connected to the grinding machine spindle. Attached Figure Description

[0015] Figure 1 This is the front view of this utility model.

[0016] In the diagram: 1-Mandrel, 2-Port expansion sleeve, 3-Positioning screw sleeve, 4-Inner wall expansion sleeve, 5-Center hole, 6-Spacer, 7-Positioning plate, 8-Pressure plate, 9-Boss, 10-Bolt, 11-Pressure ring, 12-Locking nut, 13-Workpiece. Detailed Implementation

[0017] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0018] like Figure 1 As shown, this utility model provides a thin-walled sleeve outer cylindrical grinding fixture, including a mandrel 1 and a pair of port expansion sleeves 2. The port expansion sleeves 2 are fitted on the left and right ends of the mandrel 1, and the left and right ends of the mandrel 1 are provided with top holes 5. The mandrel 1 is also fitted with a plurality of positioning screw sleeves 3, a plurality of inner wall expansion sleeves 4 and a plurality of spacers 6. The inner wall expansion sleeves 4 and the positioning screw sleeves 3 are arranged in pairs and clamped between two adjacent spacers 6. The spacers 6 are also arranged between the port expansion sleeves 2 and the positioning screw sleeves 3.

[0019] By adopting the technical solution of this utility model, when clamping the thin-walled sleeve, the positioning screw sleeve is first used to determine the position where the inner wall of the workpiece needs to be supported, and then the inner wall of the thin-walled sleeve workpiece is supported by the inner wall expansion sleeve. When the outer cylindrical surface of the thin-walled sleeve workpiece is ground, the grinding force from the grinding wheel is offset by the support reaction force generated by the inner wall expansion sleeve, preventing the thin wall of the workpiece from deforming and improving the grinding accuracy of the workpiece. In addition, center holes are provided at both ends of the mandrel, so that the workpiece and its fixture can be easily connected to the grinding machine spindle.

[0020] Specifically, positioning discs 7 and pressure discs 8 are fitted at both ends of the mandrel 1. A spacer 6 is positioned between the pressure disc 8 and the inner wall expansion sleeve 4. The positioning disc 7 is also placed against one of the port expansion sleeves 2. A boss 9 is also provided on the surface of the mandrel 1, and the positioning disc 7 is clamped between the boss 9 and the corresponding port expansion sleeve 2. The boss 9, positioning disc 7, and corresponding port expansion sleeve 2 are also fixed together using bolts 10. The boss 9 and the mandrel 1 are integrally manufactured.

[0021] In addition, a pressure ring 11 is fitted on the mandrel 1, and the mandrel 1 is screwed to the locking nut 12. The pressure ring 11 is clamped between the pressure plate 8 and the locking nut 12. The surface of the pressure plate 8 is also provided with a tenon groove, and at least part of the pressure ring 11 fits into the tenon groove. The mating interface between the pressure plate 8 and the locking nut 12 is spherical. With the technical solution of this utility model, when the locking nut 12 is tightened, the locking force generated by the locking nut 12 is used to secure the workpiece between the positioning plate 7 and the pressure plate, preventing the workpiece from moving along its axial direction. The other part of the locking force is transmitted through the spacer 6 to the positioning screw sleeve 3 and the inner wall expansion sleeve 4, which exerts a squeezing effect on the inner wall expansion sleeve 4, causing the inner wall expansion sleeve 4 to undergo radial deformation, thereby tightening the inner wall of the workpiece and preventing the workpiece from deforming during the grinding process.

Claims

1. A grinding fixture for the outer diameter of a thin-walled sleeve, characterized in that: It includes a mandrel (1) and a pair of port expansion sleeves (2). The port expansion sleeves (2) are fitted on the left and right ends of the mandrel (1). The left and right ends of the mandrel (1) are provided with top holes (5). The mandrel (1) is also fitted with a plurality of positioning screw sleeves (3), a plurality of inner wall expansion sleeves (4) and a plurality of spacers (6). The inner wall expansion sleeves (4) are paired with the positioning screw sleeves (3) and clamped between two adjacent spacers (6). The spacers (6) are also provided between the port expansion sleeves (2) and the positioning screw sleeves (3).

2. The thin-walled sleeve outer cylindrical grinding fixture as described in claim 1, characterized in that: The mandrel (1) is also fitted with a positioning plate (7) and a pressure plate (8) at its left and right ends. The spacer (6) is also located between the pressure plate (8) and the inner wall expansion sleeve (4). The positioning plate (7) is also close to one of the port expansion sleeves (2).

3. The thin-walled sleeve outer cylindrical grinding fixture as described in claim 2, characterized in that: The surface of the mandrel (1) is also provided with a boss (9), and the positioning plate (7) is clamped between the boss (9) and the corresponding port expansion sleeve (2).

4. The thin-walled sleeve outer cylindrical grinding fixture as described in claim 3, characterized in that: The boss (9), the positioning plate (7), and the corresponding port expansion sleeve (2) are also fixed together by bolts (10).

5. The thin-walled sleeve outer cylindrical grinding fixture as described in claim 3, characterized in that: The boss (9) and the mandrel (1) are integrally manufactured.

6. The thin-walled sleeve outer cylindrical grinding fixture as described in claim 2, characterized in that: A pressure ring (11) is also fitted on the mandrel (1), and the mandrel (1) is also screwed to the locking nut (12), and the pressure ring (11) is clamped between the pressure plate (8) and the locking nut (12).

7. The thin-walled sleeve outer cylindrical grinding fixture as described in claim 6, characterized in that: The surface of the pressure plate (8) is also provided with a tenon groove, and at least part of the pressure ring (11) is fitted into the tenon groove.

8. The thin-walled sleeve outer cylindrical grinding fixture as described in claim 6, characterized in that: The interface between the pressure plate (8) and the locking nut (12) is spherical.

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