Auxiliary positioning device for grinding outer circular surface of hollow shaft

Abstract

The invention provides a hollow shaft outer circle surface grinding auxiliary positioning device which comprises a core shaft and a pair of port expansion sleeves, the port expansion sleeves are arranged at the left end and the right end of the core shaft in a sleeving mode, center holes are formed in the left end and the right end of the core shaft, and the core shaft is further sleeved with a plurality of positioning threaded sleeves, a plurality of inner wall expansion sleeves and a plurality of spacer bushes. 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 grinding effect of the thin-wall sleeve workpiece is improved. 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] The invention belongs to the technical field of jigs, and particularly relates to an auxiliary positioning device for grinding the outer cylindrical surface of a hollow shaft. Background Art

[0002] Thin-walled sleeve parts are components widely used in various mechanical equipment or devices. When grinding the outer cylindrical surface of such workpieces, in order to prevent the workpieces from deforming during the processing, the workpieces usually need to be clamped. The jigs in the prior art generally include a backing plate and a pressing plate. Among them, the backing plate serves as a positioning reference surface, and the workpiece is clamped between the backing plate and the pressing plate.

[0003] For example, the patent document with the publication number "CN221270398U" discloses a clamping jig for thin-walled sleeve workpieces, which includes a base, a centering disk, a push rod and a positioning pin. The base is provided with a horizontal guide hole and a vertical guide hole. The horizontal guide hole and the vertical guide hole are perpendicular to each other and communicate with each other. The lower end of the positioning pin is fixedly connected to the edge of the centering disk, and the upper end of the positioning pin extends upward along the vertical direction. The surface of the centering disk is also provided with a centering column, and the centering column is sleeved in the vertical guide hole. One end of the push rod is provided with an inclined wedge surface, and the push rod is sleeved in the horizontal guide hole and the inclined wedge surface is close to the centering column. By adopting the technical solution of this patent, when a force is applied to the push rod, the centering column climbs upward along the inclined wedge surface, so that the corresponding positioning pins can simultaneously extend into the corresponding positioning holes on the surface of the workpiece, realizing synchronous positioning of each point of the workpiece and reducing the form and position error 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. Since the inside of the thin-walled sleeve workpiece is hollow, the thin wall of the workpiece is prone to large deformation, affecting the grinding accuracy of the workpiece. Summary of the Invention

[0004] To solve the above technical problems, the invention provides an auxiliary positioning device for grinding the outer cylindrical surface of a hollow shaft.

[0005] The invention is realized through the following technical solutions.

[0006] The invention provides an auxiliary positioning device for grinding the outer cylindrical surface of a hollow shaft, which includes a mandrel and a pair of port expansion sleeves. The port expansion sleeves are sleeved at 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 sleeved with a plurality of positioning nuts, a plurality of inner wall expansion sleeves and a plurality of spacer sleeves. The inner wall expansion sleeves and the positioning nuts are arranged in pairs and clamped between two adjacent spacer sleeves. The spacer sleeves are also arranged between the port expansion sleeves and the positioning nuts.

[0007] The left and right ends of the mandrel are also sleeved with a positioning disk and a pressing disk. The spacer sleeves are also arranged between the pressing disk and the inner wall expansion sleeves, and the positioning disk is also abutted against 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, the positioning disc and the corresponding port expansion sleeve are also fixedly connected into a whole by bolts.

[0010] The boss and the mandrel are integrally formed.

[0011] A pressure ring is also sleeved on the mandrel. The mandrel is also screwed with a lock nut, and the pressure ring is clamped between the pressure disc and the lock nut.

[0012] The surface of the pressure disc is also provided with a tenon groove, and at least a part of the pressure ring is sleeved in the tenon groove.

[0013] The mating interface between the pressure disc and the lock nut is spherical.

[0014] The beneficial effects of the present invention are as follows: adopting the technical solution of the present invention, when clamping a thin-walled sleeve, first use a positioning screw sleeve to determine the position where the inner wall of the workpiece needs to be supported, and then use an inner wall expansion sleeve to support the inner wall surface of the thin-walled sleeve workpiece. When grinding the outer circle surface of the thin-walled sleeve workpiece, the grinding force from the grinding wheel is offset by the 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, making it convenient for the workpiece and its fixture to be connected to the grinding machine spindle. Brief Description of the Drawings

[0015] Figure 1 is the front view of the present invention.

[0016] In the figure: 1 - mandrel, 2 - port expansion sleeve, 3 - positioning screw sleeve, 4 - inner wall expansion sleeve, 5 - center hole, 6 - spacer sleeve, 7 - positioning disc, 8 - pressure disc, 9 - boss, 10 - bolt, 11 - pressure ring, 12 - lock nut, 13 - workpiece. Detailed Embodiment

[0017] The technical solution of the present invention will be further described below, but the scope of protection claimed is not limited thereto.

[0018] As Figure 1 shown, the present invention provides an auxiliary positioning device for grinding the outer circle surface of a hollow shaft, including a mandrel 1 and a pair of port expansion sleeves 2. The port expansion sleeves 2 are sleeved on the left and right ends of the mandrel 1, and center holes 5 are provided at the left and right ends of the mandrel 1. A plurality of positioning screw sleeves 3, a plurality of inner wall expansion sleeves 4 and a plurality of spacer sleeves 6 are also sleeved on the mandrel 1. The inner wall expansion sleeves 4 and the positioning screw sleeves 3 are arranged in pairs and clamped between two adjacent spacer sleeves 6. The spacer sleeves 6 are also arranged between the port expansion sleeves 2 and the positioning screw sleeves 3.

[0019] Adopting the technical solution of the present invention, when clamping the thin-walled sleeve, first use the positioning sleeve to determine the position where the inner wall of the workpiece needs to be supported, and then use the inner wall expansion sleeve to support the inner wall surface of the thin-walled sleeve workpiece. When grinding the outer circle surface of the thin-walled sleeve workpiece, the grinding force from the grinding wheel is offset by the reaction force generated by the inner wall expansion sleeve, preventing the 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, facilitating the connection of the workpiece and its fixture to the grinding machine spindle.

[0020] Specifically, positioning disks 7 and pressure disks 8 are also sleeved on the left and right ends of the mandrel 1. A spacer sleeve 6 is also provided between the pressure disk 8 and the inner wall expansion sleeve 4. The positioning disk 7 is also abutted against one of the port expansion sleeves 2. A boss 9 is also provided on the surface of the mandrel 1. The positioning disk 7 is clamped between the boss 9 and the corresponding port expansion sleeve 2. The boss 9, the positioning disk 7 and the corresponding port expansion sleeve 2 are also fixedly connected into one body by bolts 10. The boss 9 and the mandrel 1 are integrally formed.

[0021] In addition, a pressure ring 11 is also sleeved on the mandrel 1. The mandrel 1 is also screwed with a locking nut 12, and the pressure ring 11 is clamped between the pressure disk 8 and the locking nut 12. A tenon groove is provided on the surface of the pressure disk 8, and at least a part of the pressure ring 11 is also sleeved in the tenon groove. The mating interface between the pressure disk 8 and the locking nut 12 is spherical. Adopting the technical solution of the present invention, when the locking nut 12 is tightened, part of the locking force generated by the locking nut 12 makes the workpiece reliably clamped between the positioning disk 7 and the pressure disk, preventing the workpiece from axially moving, and the other part of the locking force is transmitted to the positioning sleeve 3 and the inner wall expansion sleeve 4 through the spacer sleeve 6, exerting an extrusion effect on the inner wall expansion sleeve 4, causing the inner wall expansion sleeve 4 to generate radial deformation, thereby tightening the inner wall of the workpiece and preventing the workpiece from deforming during the grinding process.

Claims

1. An auxiliary positioning device for grinding the outer cylindrical surface of a hollow shaft, characterized in that: It includes a mandrel (1) and a pair of port expansion sleeves (2). The port expansion sleeves (2) are sleeved on the left and right ends of the mandrel (1). There are center holes (5) provided at the left and right ends of the mandrel (1). A plurality of positioning screw sleeves (3), a plurality of inner wall expansion sleeves (4) and a plurality of spacer sleeves (6) are also sleeved on the mandrel (1). The inner wall expansion sleeves (4) are arranged in pairs with the positioning screw sleeves (3) and are clamped between two adjacent spacer sleeves (6). The spacer sleeves (6) are also arranged between the port expansion sleeves (2) and the positioning screw sleeves (3).

2. The auxiliary positioning device for grinding the outer circumferential surface of the hollow shaft according to claim 1, wherein: Positioning discs (7) and pressure discs (8) are also sleeved on the left and right ends of the mandrel (1). The spacer sleeves (6) are also arranged between the pressure discs (8) and the inner wall expansion sleeves (4). The positioning disc (7) is also abutted against one of the port expansion sleeves (2).

3. The auxiliary positioning device for grinding the outer cylindrical surface of the hollow shaft according to claim 1, characterized in that: There are also bosses (9) provided on the surface of the mandrel (1). The positioning disc (7) is clamped between the boss (9) and the corresponding port expansion sleeve (2).

4. The auxiliary positioning device for grinding the outer cylindrical surface of the hollow shaft according to claim 3, wherein: The boss (9), the positioning disc (7) and the corresponding port expansion sleeve (2) are also fixedly connected into an integral body by bolts (10).

5. The auxiliary positioning device for grinding the outer cylindrical surface of the hollow shaft according to claim 3, characterized in that: The boss (9) and the mandrel (1) are integrally formed.

6. The auxiliary positioning device for grinding the outer cylindrical surface of the hollow shaft according to claim 2, characterized in that: A pressure ring (11) is also sleeved on the mandrel (1). The mandrel (1) is also screwed with a locking nut (12). The pressure ring (11) is clamped between the pressure disc (8) and the locking nut (12).

7. The auxiliary positioning device for grinding the outer cylindrical surface of the hollow shaft according to claim 6, characterized in that: There are tenon grooves provided on the surface of the pressure disc (8). At least a part of the pressure ring (11) is also sleeved in the tenon grooves.

8. The auxiliary positioning device for grinding the outer cylindrical surface of the hollow shaft according to claim 6, characterized in that: The mating interface between the pressure disc (8) and the locking nut (12) is spherical in shape.

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