CN202763106U

CN202763106U - High-precision centering expansion tool

Info

Publication number: CN202763106U
Application number: CN 201220445665
Authority: CN
Inventors: 晋嘉; 雷勇; 陈华峰
Original assignee: SICHUAN PROVINCE NEIJIANG QINGLONG MACHINE TOOL CO Ltd
Current assignee: SICHUAN PROVINCE NEIJIANG QINGLONG MACHINE TOOL CO Ltd
Priority date: 2012-09-04
Filing date: 2012-09-04
Publication date: 2013-03-06
Anticipated expiration: 2022-09-04

Abstract

The utility model discloses a high-precision centering expansion tool comprising a clamp base, a clamp body and a pulling rod, wherein the clamp base and the clamp body are provided with inner holes and connected with each other, and the pulling rod is arranged in the clamp base and the clamp body in a sliding mode. The front end of the clamp body is provided with a cone face with the front portion being low and the rear portion being high. A location step is arranged on the clamp body behind the cone face. The tool is characterized in that the front end of the pulling rod is fixedly provided with a connecting disc, a plurality of axial holes and a plurality of arc sliding grooves connected with the axial holes are arranged in the connecting disc, the transverse section of each sliding groove is a right angle, a plurality of wedge blocks are arranged in the sliding grooves of the connecting disc in a gap mode through right angle hooks at the front end, and the inner side of each wedge block is provided with a cone face matched with the front end of the clamp body. The tool has the advantages of being high in location precision, not prone to be damaged and worn, and long in service life.

Description

The high precision fixed core expansion tooling

Technical field

The utility model relates to a kind of centering expansion tooling.

Background technology

During at the part of processing belt endoporus, such as gear, the runout error that the flank of tooth is installed endoporus and end face to gear is mainly determined by the size of machine tool error, error of cutter, tool locating error.The expansion tooling that present domestic gear teeth face processing is adopted usually, such as Fig. 1, Fig. 2 and shown in Figure 3, comprise be provided with endoporus and link to each other clamping fixture seat 1 and clamp body 2, sliding is loaded on pull bar 3 in clamping fixture seat 1 and the clamp body 2, front end at clamp body 2 is provided with the low early and high after conical surface, clamp body 2 at conical surface rear is provided with positioning step, on pull bar 3, by bearing pin expansion sleeve 15 is housed, staggered several axial grooves 16 that has on the expansion sleeve 15, expansion sleeve 15 is provided with the taper hole that cooperates with the clamp body front end; During post-tensioning pull bar 3, by the endoporus that radially increases swelling workpiece 12 that expansion sleeve 15 axial displacements produce, positioning step and workpiece 12 end contacts, the location of realizing endoporus and end face; Its shortcoming is: the material of making expansion sleeve is spring steel, spring steel has: the elastic deformability was poor when hardness was high, the strong material behavior of elastic deformability when hardness is low, for its ability between the consistency and elasticity distortion that neutralizes, hardness is HRC45-48, the access times of expansion sleeve 15 are about 10,000 times like this, and because expansion sleeve 15 staggered flutings, its distortion is subject to not cutting open the constraint of part, the cylindrical bus in working order the time and the frock axial line not parallel, affect the axiality of workpiece location endoporus and frock, positioning accuracy is difficult to guarantee, the deflection of expansion sleeve 15 can not surpass 0.04-0.06mm simultaneously, otherwise can cause the coaxiality error of workpiece location endoporus and frock axial line sharply to increase, and expansion sleeve easily damages.

The utility model content

The purpose of this utility model is the above-mentioned deficiency for prior art, and a kind of high precision fixed core expansion tooling is provided, and it has advantages of that positioning accuracy is high, is difficult for damage and wear, long service life.

For achieving the above object, high precision fixed core expansion tooling of the present utility model, comprise be provided with endoporus and link to each other clamping fixture seat and clamp body, slip is loaded on the pull bar in clamping fixture seat and the clamp body, front end at clamp body is provided with the low early and high after conical surface, clamp body at conical surface rear is provided with positioning step, it is characterized in that being installed with terminal pad at the front end of pull bar, in terminal pad, be provided with several axial holes, the chute of several circular arcs that link to each other with axial hole, the cross section of chute is square, in the chute that is loaded on terminal pad of several voussoirs by the square grab gap of front end, the inboard of each voussoir is equipped with the conical surface that matches with the clamp body front end.

During use, pull back pull bar, each voussoir distending radially under the effect of the clamp body front end conical surface, the endoporus of swelling workpiece, location; Because each voussoir is separate, do not have interconnective constraint so that during the voussoir duty its cylindrical all the time with the frock axis parallel, improved positioning accuracy, and the hardness of voussoir can be increased to HRC62-65, more wear-resisting, long service life;

As further improvement of the utility model, end face is equipped with hopper in the both sides of each voussoir, and adjacent two voussoirs link to each other with rubber in the hopper by being located at the adjacent both ends face; Connecting together of each voussoir flexibility do not affect use, is more convenient for being loaded on the terminal pad;

As further improvement of the utility model, be provided with axial gathering sill in the rear end of pull bar, in clamping fixture seat, be installed with guide holder, in guide holder, be provided with a stop screw, the head of stop screw is positioned at gathering sill; Can prevent that voussoir from rotating;

In sum, the utlity model has the advantage that positioning accuracy is high, be difficult for damage and wear, long service life.

Description of drawings

Fig. 1 is the front view of existing expansion tooling.

Fig. 2 is the front view of expansion sleeve among Fig. 1.

Fig. 3 is the left view of Fig. 2.

Fig. 4 is the front view of the utility model embodiment.

Fig. 5 is the left view of pull bar among Fig. 4.

Fig. 6 is the A-A cutaway view of Fig. 5.

Fig. 7 is the front view of each voussoir among Fig. 4.

Fig. 8 is the left view of Fig. 7.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.

Extremely shown in Figure 8 by Fig. 4, this high precision fixed core expansion tooling, comprise be provided with endoporus and link to each other clamping fixture seat 1 and clamp body 2, slip is loaded on the pull bar 3 in clamping fixture seat 1 and the clamp body 2, front end at clamp body 2 is provided with the low early and high after conical surface, clamp body 2 at conical surface rear is provided with positioning step, front end at pull bar 3 is installed with terminal pad 4, in terminal pad 4, be provided with four axial holes 5, the chute 6 of four circular arcs that link to each other with axial hole 5, the cross section of chute 6 is square, in the chute that is loaded on terminal pad 46 of four voussoirs 7 by square grab 8 gaps of front end, the inboard of each voussoir 7 is equipped with the conical surface 7a that matches with the clamp body front end, end face is equipped with hopper in the both sides of each voussoir 7, and adjacent two voussoirs 7 link to each other with rubber 9 in the hopper by being located at the adjacent both ends face; Be provided with axial gathering sill 3a in the rear end of pull bar 3, be installed with guide holder 10 in clamping fixture seat 1, be provided with a stop screw 11 in guide holder 10, the head of stop screw 11 is positioned at gathering sill 3a.

During use, pull back pull bar 3, each voussoir 7 distending radially under the effect of the clamp body 2 front end conical surfaces, the endoporus of swelling workpiece 12, location; Because each voussoir 7 is separate, do not have interconnective constraint so that during the voussoir duty its cylindrical all the time with the frock axis parallel, improved positioning accuracy, and the hardness of voussoir 7 can be increased to HRC62-65, more wear-resisting, long service life; Rubber 9 connects together each voussoir 7 flexibility, does not affect use, is more convenient for being loaded on the terminal pad 4; Stop screw 11 can prevent that voussoir 7 from rotating, and is convenient to the swelling workpiece and reduces wearing and tearing.

Claims

1. high precision fixed core expansion tooling, comprise be provided with endoporus and link to each other clamping fixture seat and clamp body, slip is loaded on the pull bar in clamping fixture seat and the clamp body, front end at clamp body is provided with the low early and high after conical surface, clamp body at conical surface rear is provided with positioning step, it is characterized in that being installed with terminal pad at the front end of pull bar, in terminal pad, be provided with several axial holes, the chute of several circular arcs that link to each other with axial hole, the cross section of chute is square, in the chute that is loaded on terminal pad of several voussoirs by the square grab gap of front end, the inboard of each voussoir is equipped with the conical surface that matches with the clamp body front end.

2. high precision fixed core expansion tooling as claimed in claim 1 is characterized in that being equipped with hopper at the both sides of each voussoir end face, and adjacent two voussoirs link to each other with rubber in the hopper by being located at the adjacent both ends face.

3. high precision fixed core expansion tooling as claimed in claim 1 or 2 is characterized in that being provided with axial gathering sill in the rear end of pull bar, is installed with guide holder in clamping fixture seat, is provided with a stop screw in guide holder, and the head of stop screw is positioned at gathering sill.