SU1633169A1 - Parts attachment with plane engaged surfaces - Google Patents

Abstract

The invention relates to mechanical engineering and can be used to connect elements of machine tools for multiple use. The purpose of the invention is to increase the accuracy of the connection by dividing the errors of manufacture and assembly in proportion to the number of centering devices. Stepped expanding elements 4, cooling sleeves 5 and elastic elements 6 are installed in the round of 3 parts 1 and 2. Steps 7 and 8 are made with eccentricity LH. Glue can be used as an elastic element. The common axes of the steps of 8 n / all clamping elements form a straight ln-ty. When the parts are compressed by the bolt 1 1, the elements 6 are deformed. Forces arise that are proportional to the magnitude of the deformation. The equality of the forces occurs when the deformations of the 6 DOF elements of the holes 3 are equal. a K.iio number and centering at the center of the IB. I il.

Description

The invention relates to mechanical engineering and can be used to connect elements of machine tools for repeated use.

The purpose of the invention is to improve the accuracy of the connection by dividing the errors of manufacture and assembly in proportion to the number of centering devices.

The drawing shows a connection with flat abutting surfaces with offset blind holes in one of the parts.

The connection contains parts 1 and 2 with blind holes 3 on abutting surfaces. In the holes 3, cylindrical expanding elements 4 are installed, covering the sleeves 5 and elastic elements in the form of sleeves 6. A fastening element 7 is installed in the axial holes of the parts. The expanding elements 4 are made with chamfers 8 at the ends. The axes of the blind holes 3 in one part are offset by Δ X relative to the axes of the blind holes in the second part, while Δ X is determined from the relation (D1 - D) [(And> _{d χ} >'M-02

E 2 where D is the outer diameter of the female sleeve;

Di is the diameter of the hole in the connected part;

[σ] is the allowable stress for the elastic material of the element, taking into account the shear forces arising during the operation of the joint;

E is the elastic modulus of the material of the elastic element;

(5) and 02 — Tolerances on the bore diameters of the female sleeve and the outer surface of the expandable member.

Installation of the connection is as follows.

Elastic elements 6 are installed in the openings 3 of the connected parts 1 and 2. The sleeveless glands 5 are also installed in the openings of the elastic elements. The connected parts, elastic elements and the covering sleeves form single products. These products can be obtained by gluing female sleeves into parts 1 and 2. In this case, glue is used as an elastic element. Then, expanding elements 4 are installed in the openings of the enclosing bushes of one of the parts 1 or 2 to be connected. 4. Using the threaded fastener 7, parts 1 and 2 are compressed. The ends of the openings of the enclosing bushes interact with the entry chamfers in the expanding elements 4. The elastic elements 6 are deformed, and on the side the surface of the holes 3 of the connected parts 1 and 2, forces arise. proportional to the magnitude of the deformations, which depend on the actual values of the displacements of the holes 3 from the nominal location. Equality of efforts occurs when the deformations of the elastic elements 6 are equal in all holes 3 of the connected parts 1 and 2. i.e. manufacturing errors are divided in proportion to the number of centering devices.

Disassembly of the compounds is carried out in the reverse order.

The accuracy of the connection when installing parts on two holes with a position tolerance of ± 0.01 mm is less than 0.01 mm. When installing the same parts, not four holes, stable joint accuracy within 0.005 mm. In the case when the connection is obtained by gluing the covering elements, the complexity and cost of its manufacture are reduced due to the exclusion of a number of technological operations for processing holes that are performed on scarce precision equipment.

Claims (2)

Claim The connection of parts with flat mating surfaces, containing a fastener installed in the through holes of the parts, and placed in blind holes made on the mating surfaces of the parts, centering devices, each of which is made in the form of an expandable element and its sleeves, characterized in that. which, in order to improve the accuracy of the connection. it is equipped with elastic elements in the form of bushings, installed gaplessly between the walls of the blind holes and the outer surface of the enclosing bushings, expanding elements are made cylindrical. and the axes of blind holes in one of the parts to be connected are shifted relative to the axes of blind holes in another part by Δ X determined from the relation (Di - D} [о]> ,, di -I 2 E ’2 'where D is the outer diameter of the female sleeve.' Di is the diameter of the hole in the connected part: [σ] is the permissible stress for ma di and dg, respectively, the tolerances on the theriag’a of the elastic element, taking into account the diameters of the openings of the female sleeve arising during operation of joint 10 and the outer surface of the expanding electric shear forces: ment. E is the elastic modulus of the material of the elastic element;