CN221211267U

CN221211267U - Expansion core clamp for turning and grinding

Info

Publication number: CN221211267U
Application number: CN202323320681.3U
Authority: CN
Inventors: 张泽丽; 龙兴; 金峰; 沈赤卫
Original assignee: Guizhou Gaofeng Petroleum Machinery Co Ltd
Current assignee: Guizhou Gaofeng Petroleum Machinery Co Ltd
Priority date: 2023-12-06
Filing date: 2023-12-06
Publication date: 2024-06-25
Anticipated expiration: 2033-12-06

Abstract

The utility model relates to the field of machining, and provides an expanding core clamp for turning and grinding, which comprises a mandrel; the mandrel is axially divided into a large end and a small end, the diameter of the large end is larger than that of the small end, a collet is sleeved on the mandrel at a position between the large end and the small end, a taper hole is formed in the end face of the collet, opposite to the small end, and a taper block is sleeved on the mandrel and is embedded into the taper hole. The cylindrical grinding device is simple in structure and convenient to operate, can realize cylindrical grinding of the rotary plug ball valve, ensures surface roughness and product quality, reduces the cost of raw materials of clamping parts and the working procedure of cutting off chucks required by the traditional grinding method, is suitable for turning and grinding special fixtures in the process of processing similar parts in batches, saves process chucks of ball parts, reduces production cost, improves processing efficiency and accelerates production circulation of companies.

Description

Expansion core clamp for turning and grinding

Technical Field

The utility model relates to an expanding core clamp for turning and grinding, and belongs to the field of machining.

Background

Aiming at the situation that the outer spherical surfaces (roughness Ra0.4) of large-batch upper and lower cock ball valves of a company are required to be ground, if a conventional grinding method is adopted, a process chuck is required to be added to finish grinding processing of the outer spherical surfaces, and the chuck is required to be cut off after processing is finished, so that the cost is obviously increased for the company, and meanwhile, the circulation process of workpieces is prolonged.

Disclosure of utility model

In order to solve the technical problems, the utility model provides the core expanding clamp for the turning and grinding, which can effectively improve the production efficiency, reduce the cost and solve the defects existing in the prior art.

The utility model is realized by the following technical scheme.

The utility model provides an expanding core clamp for turning and grinding, which comprises a mandrel; the mandrel is axially divided into a large end and a small end, the diameter of the large end is larger than that of the small end, a collet is sleeved on the mandrel at a position between the large end and the small end, a taper hole is formed in the end face of the collet, opposite to the small end, and a taper block is sleeved on the mandrel and is embedded into the taper hole.

The cone block is sleeved on the mandrel by a nut at the outer end position relative to the collet chuck and is in threaded fit with the mandrel.

A gasket is sleeved on the mandrel between the cone block and the nut.

The collet chuck is sleeved on the big end of the mandrel, the big end of the mandrel is provided with a through hole consistent with the through hole on the collet chuck, and a cylindrical pin penetrates through the through holes on the mandrel and the collet chuck to axially limit the mandrel and the collet chuck.

The collet chuck is internally provided with a cavity, a spring is sleeved on the mandrel at the position of the cavity in the collet chuck, one end of the spring is propped against the end face of the big end of the mandrel, and the other end of the spring is propped against the end face of the cone block.

The inner surface of the cone block is provided with a key slot which is recessed along the axial direction and is in a strip shape, an anti-rotation pin is arranged in the key slot, and the outer wall of the small end of the mandrel is provided with a slotted hole so that the anti-rotation pin is matched with the slotted hole in shape.

The collet chuck is an elastic thin-wall piece.

The collet is provided with a plurality of strip-shaped grooves extending inwards from the small end direction to realize elastic expansion.

The cone blocks are in clearance fit with the mandrel.

The utility model has the beneficial effects that: the cylindrical grinding device has the advantages of simple structure and convenient operation, can realize the cylindrical grinding of the rotary plug ball valve, ensures the surface roughness and the product quality, simultaneously reduces the cost of raw materials of clamping parts and the working procedure of cutting off the clamping heads required by the traditional grinding method, is suitable for turning and grinding special fixtures in the process of processing similar parts in batches, saves the process clamping heads of ball parts, reduces the production cost, improves the processing efficiency and quickens the production circulation of companies.

Drawings

FIG. 1 is a schematic structural view of at least one embodiment of the present utility model;

FIG. 2 is a schematic structural view of the central shaft of FIG. 1;

FIG. 3 is a schematic elevational view of the cone block of FIG. 1;

FIG. 4 is a cross-sectional view of FIG. 3;

FIG. 5 is a schematic view of the collet of FIG. 1;

Fig. 6 is a cross-sectional view of fig. 5.

In the figure: the device comprises a 1-mandrel, a 2-cylindrical pin, a 3-collet chuck, a 4-spring, a 5-cone block, a 6-anti-rotation pin, a 7-gasket and an 8-nut.

Detailed Description

The technical solution of the present utility model is further described below, but the scope of the claimed utility model is not limited to the above.

A first embodiment of the present utility model relates to a turning and grinding expanding jig as shown in fig. 1 to 6, comprising a mandrel 1; the mandrel 1 is divided into a large end and a small end along the axial direction, the diameter of the large end is larger than that of the small end, a collet 3 is sleeved on the mandrel 1 at a position between the large end and the small end, a taper hole is formed in the end face of the collet 3 opposite to the small end, and a taper block 5 is sleeved on the mandrel 1 and is embedded in the taper hole.

Therefore, the collet can be inflated to realize positioning and clamping of the ball parts by pushing the cone block to move on the taper surface of the collet, and particularly, the ball parts can be better positioned and clamped, so that the process collet of the ball parts is saved, the production cost is reduced, the processing efficiency is improved, and the production circulation of companies is accelerated.

The second embodiment of the present utility model is substantially the same as the first embodiment, and is mainly characterized in that the cone block 5 is sleeved on the mandrel 1 by a nut 8 at the outer end position of the collet chuck 3 and is in threaded fit with the mandrel 1. Therefore, the nut 8 of the expanding core clamp can be screwed to push the cone block 5 to move on the taper surface of the collet chuck 3, so that the operation is more convenient, and the work is more stable.

Further, a gasket 7 is sleeved on the mandrel 1 between the cone block 5 and the nut 8.

Furthermore, a key slot which is in a strip shape along the axial depression is arranged on the inner surface of the cone block 5, an anti-rotation pin 6 is arranged in the key slot, and a slotted hole is formed on the outer wall of the small end of the mandrel 1 so that the anti-rotation pin 6 is matched with the slotted hole in shape. Therefore, the anti-rotation pin 6 is connected with the mandrel 1 to prevent the cone block 5 from rotating, so that the ball parts are prevented from shaking in the grinding process, and the dimensional deviation is avoided to be waste.

Further, the cone block 5 is in clearance fit with the mandrel 1.

The third embodiment of the present utility model is substantially the same as the first embodiment, and is mainly characterized in that a through hole is formed in the collet 3 at a position where the collet 3 is fitted over the large end of the mandrel 1, a through hole corresponding to the through hole in the collet 3 is formed in the large end of the mandrel 1, and a cylindrical pin 2 is inserted through the through holes in the mandrel 1 and the collet 3 to axially limit the mandrel 1 and the collet 3.

Furthermore, a cavity is formed in the collet chuck 3, a spring 4 is sleeved on the mandrel 1 at the position of the cavity in the collet chuck 3, one end of the spring 4 abuts against the end face of the large end of the mandrel 1, and the other end abuts against the end face of the cone block 5. Therefore, when the nut 8 is loosened, the conical block 5 is pushed out by the pressing force of the spring 4, so that the core expanding clamp is loosened.

Further, the collet 3 is an elastic thin-walled member.

Further, the collet 3 is provided with a plurality of strip-shaped grooves extending inwards from the small end direction to realize elastic expansion. Generally, the technical means is specifically realized by forming three grooves on the outer circle to realize elastic expansion.

Based on the above, when the utility model is used, the embodiment is firstly fixed on the collet through the inner hole of the ball part, and the front end and the rear end of the mandrel of the expanding core clamp are both ground with tip holes for fixing with a grinding machine during grinding. The device has simple structure and convenient operation, can realize the cylindrical grinding of the rotary plug ball valve, ensures the surface roughness and the product quality, simultaneously reduces the cost of raw materials of clamping parts and the working procedure of cutting off the clamping heads required by the traditional grinding method, is suitable for turning and grinding special fixtures in the process of processing similar parts in batches, saves the process clamping heads of ball parts, reduces the production cost, improves the processing efficiency and quickens the production circulation of companies.

Claims

1. The utility model provides a car grinds with expanding heart anchor clamps, includes mandrel (1), its characterized in that: the mandrel (1) is axially divided into a large end and a small end, the diameter of the large end is larger than that of the small end, a collet (3) is sleeved on the mandrel (1) at a position between the large end and the small end, a taper hole is formed in the end face of the collet (3) opposite to the small end, and a taper block (5) is sleeved on the mandrel (1) and embedded into the taper hole.

2. The expansion core clamp for turning and grinding as set forth in claim 1, wherein: the cone block (5) is sleeved on the mandrel (1) relative to the outer end position of the collet (3) by a nut (8) and is in threaded fit with the mandrel (1).

3. The expansion core clamp for turning and grinding as set forth in claim 2, wherein: a gasket (7) is sleeved on the mandrel (1) between the cone block (5) and the nut (8).

4. The expansion core clamp for turning and grinding as set forth in claim 1, wherein: the collet (3) is sleeved on the large end of the mandrel (1) and provided with a through hole, the large end of the mandrel (1) is provided with a through hole consistent with the through hole on the collet (3), and the cylindrical pin (2) penetrates through the through holes on the mandrel (1) and the collet (3) to axially limit the mandrel (1) and the collet (3).

5. The expansion core clamp for turning and grinding as set forth in claim 1, wherein: the collet chuck (3) is internally provided with a cavity, a spring (4) is sleeved on the mandrel (1) at the position of the cavity in the collet chuck (3), one end of the spring (4) is propped against the end face of the large end of the mandrel (1), and the other end of the spring is propped against the end face of the cone block (5).

6. The expansion core clamp for turning and grinding as set forth in claim 1, wherein: the inner surface of the cone block (5) is provided with a key slot which is recessed along the axial direction and is provided with an anti-rotation pin (6) which is arranged in the key slot, and the outer wall of the small end of the mandrel (1) is provided with a slotted hole so that the anti-rotation pin (6) is matched with the slotted hole in shape.

7. The expansion core clamp for turning and grinding as set forth in claim 1, wherein: the collet chuck (3) is an elastic thin-wall piece.

8. The expansion core clamp for turning and grinding as set forth in claim 7, wherein: the collet (3) is provided with a plurality of strip-shaped grooves extending inwards from the small end direction to realize elastic expansion.

9. The expansion core clamp for turning and grinding as set forth in claim 1, wherein: the cone block (5) is in clearance fit with the mandrel (1).