SU1530339A1 - Arbor for centering and securing thin-walled parts - Google Patents

Abstract

This invention relates to metalworking and can be used to fasten thin-walled parts. The purpose of the invention is to increase the reliability of the fastening by means of uniform distribution of the fastening forces. The sectors 1 are in contact with expanding elements 3 made on one side in the form of a collet 4, and on the other in the form of a cone 5. On the petals of the collets 4 there are internal projections 6 with center holes and grooves 10 into which the projections 11 of the crown bushings 12 are inserted A spring 16 and a support pipe 20 are placed between them. Anti-friction linings 17 are glued on cones 5. Part 21 is mounted on sectors 1. The mandrel is placed in centers 18 and 19, which are reduced. Expansion elements 3 move, break up sectors 1 and clamps part 21 1 hp f-ly, 2 ill.

Description

"77 9 - 5212 2014 № J5 21 II I I P1IIILL

17

1

This invention relates to metalworking and may be used to fix thin-walled parts.

1; the spruce of the invention is to increase the attachment curvature by uniformly distributing the securing forces.

Figure 1 shows the mandrel, ob1dG1 view; figure 2 - view of L in figure 1

The mandrel consists of sectors 1, in the middle part of which conical surfaces 2 are made, and expanding elements 3. Each of the latter is made on one side in the form of a collet 4, and on the other in the form of a cone 5 and has the shape of a glass. The petals of the collets 4 have internal projections 6, a through centering hole 7, open radial slots 8 with recesses 9 of the collet end 4 and end through grooves 10, into which the projections 11 of the crown bushings 12 are closed, closed with retaining rings 13. The corona sleeves 12 of their are screwed between each other with a screw 14 and a nut 15 screwed on it. A spring 16 is placed between them. Anti-friction pads 17 are glued to the tapered parts 5 of the expanding elements 3, which form a pair of anti-friction pipe (textolite - aluminum alloy). The mandrel is installed in machine centers 18 and 19, one of which can be the master. 1, a stop pipe 20 is installed between the sleeves 12.

In order to fasten, the part 21 is mounted on the mandrel sectors 1, placed in the centers 18 and 19. The latter are reduced to getting their cones into the holes 7. With further alignment of the centers 18 and 19, the expansion elements 3, compressing the spring 16, move towards each other, Divorce sector 1 in the middle of a sec. Due to the fact that the angle of the cone 5 is significantly less than the angle of the cone of the center hole, with the same axial force, the expansion forces in the radial direction will be greater on the cone 5. After the pressures

the elements are stopped, the cones of the centers 18 and 19, the entrance deeper into the holes 7, unclench the collet parts 4, move apart, respectively, the mandrel sector 1 in the outer sections. . To prevent the deformation of the part 21, when fastening the collet ends 1 4 of the crimping elements 3 do not expand until breakage. The inner surfaces of the grooves 10 abut against the protrusions 11 of the crown bushings 12 and limit the unclamping to the inner sections. In medium sections, the unclamping is limited by a stop pipe 20, which stops the convergence of the expanding elements 3.

When diluting the centers 18 and 19, the mandrels are carried out first in the extreme sections and then in the middle sections. And here already the dilution of the expanding elements 3 is carried out by the return spring 16. The anti-friction linings 17 reduce the forces of friction and facilitate its work.

Claims (2)

1. An adapter for centering and securing thin-walled parts, containing sectors and expansion elements at one end. in the form of a collet, and on the other in the form of a cone, designed to interact with the extreme and middle sections of the sectors, characterized in that, in order to increase the security of fixing, the mandrel is equipped with corona bushings with protrusions and an anvil tube installed in the collet cavity, and On the petals of the races of the expanding elements, internal projections are made with end grooves in which the projections of the crown bushings are placed, the stop pipe being placed between the crown bushings and intended to interact with their ends. 2. Shim pop 1, characterized in that it is provided with anti-friction linings mounted on the surface of the cones of the expanding elements and a spring located between the crown bushings. Editor L.Zaytseva Compiled by A. Gribkov Tehred M. Didyk Proofreader V. Kabatsy Order 7809/12 Circulation 831 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab., A / 5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 eleven Phie.g Gtpolisnoe