CN210413525U

CN210413525U - Spherical compressing mandrel structure

Info

Publication number: CN210413525U
Application number: CN201921070142.XU
Authority: CN
Inventors: 张阳; 黄啸; 任连明; 闫云雪; 姬广勋; 刘晶晶; 程功
Original assignee: AECC Harbin Dongan Engine Co Ltd
Current assignee: AECC Harbin Dongan Engine Co Ltd
Priority date: 2019-07-09
Filing date: 2019-07-09
Publication date: 2020-04-28
Anticipated expiration: 2029-07-09

Abstract

The utility model belongs to processing frock, in particular to spherical dabber structure that compresses tightly. The mandrel fixes the blank to be processed through setting the shape surfaces, wherein one shape surface is a movable shape surface and can axially move to realize the compaction of the blank; the structure also comprises a gasket, wherein the gasket is sleeved on the mandrel and tightly pressed on the outer side of the movable surface; the gasket is a cylinder, a through hole is processed along the axial direction, the cylinder is of a transverse split structure, and the butt joint end face is a spherical face. Compared with the prior art, the technical scheme has the advantages that the buffer component is added, the stability of part processing is improved, and the precision of part processing is ensured.

Description

Spherical compressing mandrel structure

Technical Field

The invention belongs to a processing tool, and particularly relates to a spherical pressing mandrel structure.

Background

In the thin-wall pipe machining process, because the reference shaft diameters at the two ends of the part are small in wall thickness and weak in rigidity, when a mandrel is used for clamping, the clamping force is not easy to control, the axial clamping force applied to the part is not uniform, and the part is bent and deformed due to the deformation or the offset load of the reference shaft diameter. After the parts are machined, the mandrel is disassembled, and the precision requirement cannot be guaranteed during measurement.

Disclosure of Invention

The technical problems solved by the invention are as follows: the spherical pressing mandrel structure with the damping effect is provided, and the stability of part processing is improved.

The technical scheme of the invention is as follows: a spherical dabber structure that compresses tightly, characterized by: the mandrel fixes the blank to be processed through setting the shape surfaces, wherein one shape surface is a movable shape surface and can axially move to realize the compaction of the blank; the structure also comprises a gasket, wherein the gasket is sleeved on the mandrel and tightly pressed on the outer side of the movable surface; the gasket is a cylinder, a through hole is processed along the axial direction, the cylinder is of a transverse split structure, and the butt joint end face is a spherical face. Compared with the prior art, the technical scheme has the advantages that the buffer component is added, the stability of part processing is improved, and the precision of part processing is ensured.

Preferably, the gasket is an elastic resin material. The selection of the material can fully ensure the realization of the damping effect.

Preferably, the blank to be processed is a pipe. The technical scheme determines the optimal processing object and has obvious effect on the pipe processing.

Drawings

FIG. 1 is a schematic structural view of a use state of the present invention;

fig. 2 is a longitudinal sectional view of the gasket.

Detailed Description

The aeroengine accessory casing has higher and higher requirements on light weight, and the rigidity of a gear shaft is weaker. Therefore, in the gear grinding process, a mandrel clamp is often adopted for auxiliary machining. The tool comprises a mandrel rod 1, an apex 2, a gasket 3, a gasket 4 and a nut 5. The gear to be machined is assembled on the mandrel rod 1, the tip 2, the gasket 3 and the gasket 4 are assembled, and finally the nut 5 is used for pressing. The center holes at two ends of the part are respectively positioned on the center 2 and the mandrel rod 1, the part is compressed by the nut 5 through the center 2, and large force needs to be applied in the axial direction to prevent the part from rotating. The rigidity is poor because the shaft diameter wall thickness of the tip structure position at the two ends of the part is thin. And the force transmitted downwards through the threads belongs to the offset load, so that the center 2 is easily in point contact with the local point of the center hole of the part, and the elliptic deformation of the reference shaft diameter is caused. The mandrel structure is characterized in that a pair of spherical gaskets are additionally arranged between the nut 5 and the tip 2, the gasket 3 is a convex spherical surface, and the gasket 4 is a concave spherical surface. When the force transmitted downwards through the nut is subjected to unbalance loading, the spherical gasket can automatically center to generate buffering, and the load is uniformly transmitted downwards through the concave spherical structure of the gasket 4, so that the uniformity of the load is ensured, the elastic elliptical deformation of the reference axis diameter of the part due to unbalance loading is avoided, and the precision requirement of the ground gear is further ensured.

In addition, the material of the gasket 3 and the gasket 4 is preferably elastic resin material, which not only transmits uniform load, but also absorbs vibration generated in the processing process, thereby further improving the processing precision. The lengths of the mandrel rod 1 and the center 2 can be adjusted according to the actual conditions of parts and a machine tool. The rolling flower which is convenient to disassemble is designed on the center 2, so that the friction force is increased, and the decomposition after processing is convenient.

The technical scheme can ensure the part processing quality, has simple structure and convenient installation, and has the characteristic of improving the part processing qualified rate.

Claims

1. A spherical dabber structure that compresses tightly, characterized by: the mandrel fixes the blank to be processed through setting the shape surfaces, wherein one shape surface is a movable shape surface and can axially move to realize the compaction of the blank;

the structure also comprises a gasket, wherein the gasket is sleeved on the mandrel and tightly pressed on the outer side of the movable surface;

the gasket is a cylinder, a through hole is processed along the axial direction, the cylinder is of a transverse split structure, and the butt joint end face is a spherical face.

2. A spherical pressing mandrel structure as claimed in claim 1, wherein: the cylindrical gasket is of a transverse split structure.

3. A spherical pressing mandrel structure as claimed in claim 2, wherein: the butt joint end face of the split structure gasket is a spherical face.

4. A spherical pressing mandrel structure as claimed in claim 1, wherein: the gasket is made of elastic resin material.

5. A spherical pressing mandrel structure as claimed in claim 1, wherein: the blank to be processed is a pipe.

6. A spherical pressing mandrel structure as claimed in claim 5, wherein: the blank to be processed is a gear shaft.