CN111014746A

CN111014746A - Internal hydraulic floating expansion sleeve

Info

Publication number: CN111014746A
Application number: CN201911356998.8A
Authority: CN
Inventors: 李晓峰
Original assignee: Baoding Xiangyang Aviation Precision Machinery Co ltd
Current assignee: Baoding Xiangyang Aviation Precision Machinery Co ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-04-17
Anticipated expiration: 2039-12-25
Also published as: CN111014746B

Abstract

The invention discloses an internal hydraulic floating expansion sleeve, which comprises a base body, an upper cover, a floating guide sleeve, an expansion sleeve, a mandrel, a gland, a copper cap and a sealing element, wherein a through hole is formed in the center of the base body; the core shaft penetrates through the center of the floating guide sleeve, the pull rod is installed at the bottom of the core shaft, the expansion sleeve is installed at the head of the core shaft, the upper cover is arranged on the step at the bottom of the expansion sleeve, and the upper cover is fixedly installed on the base body. The hydraulic floating expansion sleeve can perform floating expansion on an inner hole of a workpiece and then lock the inner hole, so that the rigidity of the workpiece during processing is increased.

Description

Internal hydraulic floating expansion sleeve

Technical Field

The invention relates to an element for floating and tensioning an inner hole of a workpiece in the field of machining, in particular to an internal hydraulic floating expansion sleeve.

Background

The field of machining in China is developing at a high speed, and products are continuously updated; the trial production of new products can not be separated from the fixture. The machine tool clamp is used for fixing a machined workpiece. The process of centering, positioning and clamping the workpiece is often used in the first procedure of process programming, and the processing of the procedure directly affects the quality of subsequent processing. However, in the existing fixture design, when floating and tensioning are performed on the inner hole of the workpiece, the mandrel is adopted to slide in the fixed guide sleeve, and finally the expansion sleeve is driven to rigidly tension the workpiece, however, when floating and tensioning are performed on the inner hole of the thin-wall workpiece, no effective solution is provided at present. Therefore, a hydraulic floating expansion sleeve with easy operation and high reliability is urgently needed to solve the problem which always puzzles the technical personnel in the field in the prior art.

Disclosure of Invention

The invention aims to provide an internal hydraulic floating expansion sleeve which is simple to operate, simple in structure and good in reliability, can lock an inner hole of a workpiece after floating expansion, and increases the rigidity of the workpiece during machining.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an interior hydraulic pressure cover that rises that floats which characterized in that: the floating guide sleeve is arranged at the lower part of the floating guide sleeve, the gland is fixedly arranged below the base body, the copper cap and the sealing element are arranged between the gland and the bottom surface of the floating guide sleeve, oil inlets are arranged right below the copper cap and the sealing element, and an oil path communicated with the oil inlets is arranged in the gland;

the core shaft penetrates through the center of the floating guide sleeve, the pull rod is installed at the bottom of the core shaft, the expansion sleeve is installed at the head of the core shaft, the upper cover is arranged on the step at the bottom of the expansion sleeve, and the upper cover is fixedly installed on the base body.

Further preferably, the upper section of the mandrel is matched with the upper section of the inner hole of the expansion sleeve through a conical surface.

Further preferably, the floating guide sleeve can freely move in the through hole of the base body, and the original positioning of the workpiece cannot be damaged in the tensioning process of the expansion sleeve.

Further preferably, the copper cap and the sealing element can generate plastic deformation under the action of oil pressure, so that the floating guide sleeve is locked, and the floating guide sleeve, the mandrel and the expansion sleeve do not have radial displacement in the locking process.

The invention has the beneficial effects that:

when the internal hydraulic floating expansion sleeve is used, the base body is arranged on a bottom plate of a clamp, the pull rod drives the mandrel to do linear motion along the floating guide sleeve under the action of external force, and the expansion sleeve expands outwards along the radial direction under the action of the conical surface of the mandrel; when a workpiece to be processed is placed in place, the pull rod moves upwards under the action of external force, the mandrel is driven to drive the floating guide sleeve to move axially, the expansion sleeve is driven by the conical surface of the mandrel to expand radially, after a certain bus of the expansion sleeve is contacted with the workpiece, the expansion sleeve continues to expand because the floating guide sleeve can freely slide between the base body and the gland, the expansion sleeve moves along the radial direction, a second bus of the expansion sleeve is also contacted with an inner hole of the workpiece in the expansion moving process, after the expansion sleeve is completely attached to the inner hole of the workpiece, hydraulic oil is communicated on an oil way, and the copper cap elastically deforms under the action of the hydraulic oil to lock the end face of the floating guide sleeve. Therefore, the internal hydraulic floating expansion sleeve is particularly suitable for floating expansion of the inner hole of the workpiece.

Drawings

Fig. 1 is a schematic sectional structure diagram of the internal hydraulic floating expansion sleeve of the invention.

Fig. 2 is a partially enlarged schematic view of I of fig. 1.

In the figure: 1. a mandrel; 2. expanding sleeves; 3. a floating guide sleeve; 4. screwing; 5. an upper cover; 6. a substrate; 7. a gland; 8. a lower screw; 9. a pull rod; 10. a copper cap; 11. a seal member; 12. an oil inlet; 13. an oil passage.

Detailed Description

The invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1 and 2, the present embodiment includes a base body 6, an upper cover 5, a floating guide sleeve 3, an expansion sleeve 2, a mandrel 1, a gland 7, a copper cap 10, a sealing member 11 and a pull rod 9, a through hole is provided in the center of the base body 1, the floating guide sleeve 3 is installed in the through hole, the gland 7 is provided at the lower part of the floating guide sleeve 3, the gland 7 is fixedly installed below the base body 6 through a lower screw 8, the copper cap 10 and the sealing member 11 are installed between the gland 7 and the bottom surface of the floating guide sleeve 3, an oil inlet 12 is provided right below the copper cap 10 and the sealing member 11, and an oil path 13 communicated with; the mandrel 1 penetrates through the center of the floating guide sleeve 3, the bottom of the mandrel 1 is connected with a pull rod 9 through a step groove, the expansion sleeve 2 is installed at the head of the mandrel 1, an upper cover 5 is arranged on a step at the bottom of the expansion sleeve 2, and the upper cover 5 is fixedly installed on the base body 6 through an upper screw 4. The upper section of the mandrel 1 is matched with the upper section of the inner hole of the expansion sleeve 2 by a conical surface.

The floating guide sleeve 3 can move at will in the through hole of the base body 6, and the original positioning of the workpiece cannot be damaged in the tensioning process of the expansion sleeve 2. The copper cap 10 and the sealing element 11 can generate plastic deformation under the action of oil pressure, so that the floating guide sleeve 3 is locked, and the floating guide sleeve 3, the mandrel 1 and the expansion sleeve 2 do not have radial displacement in the locking process.

The embodiment is only an illustration of the concept and implementation of the present invention, and is not a limitation, and technical solutions without substantial changes are still within the protection scope under the inventive concept.

Claims

1. The utility model provides an interior hydraulic pressure cover that rises that floats which characterized in that: the floating guide sleeve is arranged at the lower part of the floating guide sleeve, the gland is fixedly arranged below the base body, the copper cap and the sealing element are arranged between the gland and the bottom surface of the floating guide sleeve, oil inlets are arranged right below the copper cap and the sealing element, and an oil path communicated with the oil inlets is arranged in the gland;

2. The internal hydraulic floating expansion sleeve of claim 1, wherein: the upper section of the mandrel is matched with the upper section of the inner hole of the expansion sleeve through a conical surface.

3. The internal hydraulic floating expansion sleeve of claim 1, wherein: the floating guide sleeve can move randomly in the through hole of the base body, and the original positioning of the workpiece cannot be damaged in the tensioning process of the expansion sleeve.

4. The internal hydraulic floating expansion sleeve of claim 1, wherein: the copper cap and the sealing piece can generate plastic deformation under the action of oil pressure, so that the floating guide sleeve is locked, and the floating guide sleeve, the mandrel and the expansion sleeve do not have radial displacement in the locking process.