CN215615116U

CN215615116U - Finish turning datum plane excircle location frock

Info

Publication number: CN215615116U
Application number: CN202121813383.6U
Authority: CN
Inventors: 章家高; 黄豪; 羊玉梅
Original assignee: Shanghai Yaoyuan Corp
Current assignee: Shanghai Yaoyuan Corp
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2022-01-25
Anticipated expiration: 2031-08-05

Abstract

The utility model provides a finish turning datum plane outer circle positioning tool, and relates to the technical field of positioning tools, wherein the positioning tool comprises a positioning driving block and a rotary thimble; a workpiece with a bell-shaped shell structure is tightly pressed between the positioning driving block and the rotary thimble; the workpiece consists of a shell and an external shaft which are of an integrated structure; one end of the shell is open; the opening is internally provided with an internal spherical surface; one end of the external connecting shaft is connected with the shell, and the other end of the external connecting shaft is connected with the rotary thimble; the rotary thimble is arranged on the tail frame of the machine tool; the positioning driving block consists of a head and a connecting shaft; the shape of the end head is similar to the inner spherical surface of the workpiece; the end head extends into the shell through the opening of the shell; the center lines of the inner spherical surface, the outer connecting shaft 32, the end 41, the connecting shaft 42 and the rotary thimble 2 are positioned on a straight line. By using the positioning tool, rebound cannot be generated when the outer circle of the reference surface is turned, the coaxiality and precision of turning are ensured, the qualification rate is further improved, and the production cost is reduced.

Description

Finish turning datum plane excircle location frock

Technical Field

The utility model relates to the technical field of positioning tools, in particular to a positioning tool for turning an excircle of a reference surface of a workpiece with a bell-shaped shell structure.

Background

For a long time, the outer circle of the reference surface of the workpiece with the bell-shaped shell structure is machined by turning. A positioning tool is required to be used in the turning process; the positioning tool in the prior art is shown in fig. 1; the positioning tool comprises a conical surface positioning block 1 connected with a machine tool spindle and a rotary thimble 2 fixed on a machine tool tailstock, and the conical surface positioning block 1 and the rotary thimble 2 interact to position and clamp a workpiece 3.

Because the appearance of the workpiece is a rotating body, in the traditional turning process, the main shaft of the machine tool can drive the workpiece to rotate and turn. Because the machining tolerance of the large end face chamfer of the workpiece is relatively large, the workpiece positioning mode easily enables the machined workpiece to rebound, and the coaxiality and the precision of turning are influenced. Resulting in the decrease of the product qualification rate and the increase of the rejection rate, and the increase of the production cost of enterprises.

Based on the shortcomings of the prior art, a positioning tool for finish turning of the outer circle of the reference surface of a workpiece with a bell-shaped shell type structure needs to be further improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a positioning tool for finely turning an excircle of a datum plane so as to solve the technical problem.

In order to achieve the purpose, the excircle positioning tool for the finish turning datum plane comprises a positioning driving block and a rotary thimble; and a workpiece with a bell-shaped shell type structure is compressed between the positioning driving block and the rotary thimble.

The workpiece consists of a shell and an external shaft which are of an integrated structure; one end of the shell is open; the opening is internally provided with an internal spherical surface; one end of the external connecting shaft is connected with the shell, and the other end of the external connecting shaft is connected with the rotary thimble; the rotary thimble is arranged on the tail frame of the machine tool; the positioning driving block consists of a head and a connecting shaft; the shape of the end head is similar to the inner spherical surface of the workpiece; the end head extends into the shell through the opening of the shell; the connecting shaft is connected with a main shaft of the machine tool; the center lines of the inner spherical surface, the outer connecting shaft, the end head, the connecting shaft and the rotary thimble are positioned on the same straight line.

Furthermore, the side of the end is provided with an anti-slip pin, one end of the anti-slip pin is fixedly connected with the side of the end, and the other end of the anti-slip pin is abutted against the inner spherical surface of the shell.

In addition, a central hole is formed in one end, far away from the shell, of the outer connecting shaft of the workpiece; a head thimble corresponding to the central hole is arranged on the rotary thimble; the head thimble is connected with the central hole in a matching way.

Has the advantages that:

by using the positioning tool, rebound cannot be generated when the outer circle of the reference surface is turned, the coaxiality and precision of turning are ensured, the qualification rate is further improved, and the production cost is reduced.

Drawings

Fig. 1 is a schematic structural view of a conventional positioning tool.

Fig. 2 is a schematic structural diagram of the positioning tool of the present invention.

Fig. 3 is a schematic structural view of the positioning driving block and the anti-slip pin of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and similar words are intended to mean that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.

Aiming at the problems in the prior art, the embodiment of the utility model provides a finish turning reference surface outer circle positioning tool.

Examples

As shown in fig. 1 to 3, a positioning tool for finely turning an excircle of a datum plane comprises a positioning driving block 4 and a rotary thimble 2; a workpiece 3 with a bell-shaped shell type structure is pressed between the positioning driving block 4 and the rotary thimble 2.

The workpiece 3 is composed of a shell 31 and an external shaft 32 which are of an integrated structure; one end of the housing 31 is open; the opening is internally provided with an internal spherical surface; one end of the external shaft 32 is connected with the shell 31, and the other end is connected with the rotary thimble 2; the rotary thimble 2 is arranged on a tail frame (not shown in the figure) of the machine tool; the positioning driving block 4 consists of a head 41 and a connecting shaft 42; the shape of the end 41 is similar to the inner spherical surface of the workpiece 3; the tip 41 extends into the interior of the housing 31 through the opening of the housing 31; the connecting shaft 42 is connected with a machine tool spindle (not shown in the figure); the center lines of the inner spherical surface, the outer connecting shaft 32, the end 41, the connecting shaft 42 and the rotary thimble 2 are positioned on a straight line.

The side of the end 41 is provided with an anti-slip pin 5, one end of the anti-slip pin 5 is fixedly connected with the side of the end 41, and the other end is abutted against the inner spherical surface of the shell 31.

A central hole is formed in one end, far away from the shell 31, of the outer connecting shaft 32 of the workpiece 3; the rotary thimble 2 is provided with a head thimble 21 corresponding to the central hole; the head thimble 21 is connected with the central hole in a matching way.

When the positioning tool works, a workpiece is compressed and positioned by the driving block 4 and the rotary thimble 2; further anti-slip fixation is performed by the anti-slip pin 5. The end head 41 of the positioning driving block 4 is matched with the inner spherical surface of the shell 31 of the workpiece 3; the head thimble 21 on the rotary thimble 2 is matched with the central hole of the workpiece 3; and then the machine tool spindle is used for compressing.

Since the tip 41 of the drive block 4 is positioned inside the housing 31 of the workpiece 3, the key to this contact is that the tip 41 is not in contact with the workpiece 3, which is the opening of the workpiece; the contact point of this embodiment is inside the opening; the large end face chamfer machining tolerance at the opening is relatively large, rebound is easily caused in the turning process, the end face chamfer error at the contact point of the embodiment is relatively small, rebound is not easily caused, and further anti-slip treatment is performed through the anti-slip pin, so that the anti-slip structure is firmer.

Although the embodiments of the present invention have been described in detail hereinabove, it is apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it is to be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the following claims. Moreover, the utility model as described herein is capable of other embodiments and of being practiced or of being carried out in various ways.

Claims

1. A positioning tool for finely turning an excircle of a datum plane is characterized by comprising a positioning driving block and a rotary thimble; a workpiece with a bell-shaped shell structure is tightly pressed between the positioning driving block and the rotary thimble;

2. The fine turning datum plane excircle positioning tool according to claim 1, characterized in that a side surface of the end head is provided with an anti-slip pin, one end of the anti-slip pin is fixedly connected with the side surface of the end head, and the other end of the anti-slip pin abuts against an inner spherical surface of the shell.

3. The fine turning datum plane excircle positioning tool according to claim 1, characterized in that one end of an external shaft of a workpiece, which is far away from a shell, is provided with a central hole; a head thimble corresponding to the central hole is arranged on the rotary thimble; the head thimble is connected with the central hole in a matching way.