SU1379013A1 - Expanding mandrel - Google Patents

Abstract

The invention relates to the field of metalworking and can be used to fasten parts of liners. The purpose of the invention is to improve the clamping accuracy by ensuring uniform distribution of the clamping forces. In the housing 1 with a thin-walled working part 2, pressure sleeves 3, 4, support sleeve 5, pressure screw 6 and elastically deformable element 7 are installed. On the surface of the elastically deformable element 7 there are made through slots 8 spaced from each other at an equal distance and forming between themselves equal bridges a, displaced relative to each other along the axis of the elastically deformable element 7 due to the formation of a helical surface. When screwing in the pressure screw 6 in the elastically deformable element 7, deformations occur that unclench the working part 2 of the mandrel and secure the part. 3 il. (ABOUT

Description

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The invention relates to metalworking and can be used to secure liner-like parts.

The purpose of the invention is to improve the clamping accuracy by ensuring uniform distribution of the clamping forces.

FIG. 1 shows an expandable mandrel, a longitudinal section; in fig. 2 - the elastic component in free-form of the elastically deformable element 7 uses polyurethane.

The mandrel works as follows.

By screwing in the pressure screw 6, the force is transferred to the elastically deformable element 7. In the latter, bending forces arise that are directed along the lines connecting the centers 9 of the bridges a and the axis of the elastically deformed element 7. Since the surfaces of the bridges a

standing; in fig. 3 section A A in FIG. 2. U is a screw surface. The mandrel consists of a body 1 with thin bending forces distributed along

wall working part 2, pressure sleeves 3 and 4, support sleeve 5 and pressure screw 6, as well as an elastically deformable element 7. On the surface of the latter.

it is made through slots 8, spaced from each other, for example, at equal distance and forming equal jumpers a in the row, displaced from each other along the axis of the elastically deformable element 7 due to the formation 20 is proportional to the applied force of the screw surface . Slot 8 is made in this way, when landing on a 2–3 mm thin-breadth

thin-walled working part 2 along the helix, and the centers of curvature of the bends of the jumpers and lies on the helical surface. In working condition, the transverse overall size of the mandrel increases due to the total helical deformation of the straight thin-walled working part 2 of the housing 1, and this deformation is uniform in length, and the deformation value

The size of the jumper a is selected either by calculation or experienced on the basis of ensuring uniform deformation of the weakened portion of the surface of the elastically deformable element 7 and ensuring its maximum area interacting with the inner surface of the thin-walled working part 2 of the housing 1.

The step ti of the screw bridges of the jumpers a is chosen on the basis that on the (length) width of the fixed screw part the base makes two full turns, which corresponds to the optimal variant of fastening the parts on the mandrel and its centering. As material for izg30

the wall working part 2 of the housing 1 of the part is turned out to be uniformly clamped along the entire length.

Claims (1)

Invention Formula An expanding mandrel, in the case of which an elastically deformable element is located, has support and pressure sleeves, characterized in that, in order to improve the fixing accuracy, through-slots are made on the surface of the elastically deformable element that form equal jumpers interlaced with each other in the axial direction from the condition formation of a screw surface. polyurethane is used to produce the elastically deformable element 7. The mandrel works as follows. By screwing in the pressure screw 6, the force is transmitted to the elastically deformable element 7. In the latter, bending forces arise that are directed along the lines connecting the centers 9 of the bridges a and the axis of the elastically deformed element 7. Since the surfaces of the bridges a represent a screw surface. bending forces are distributed along represent a screw surface. bending forces are distributed along is proportional to the applied force. Thus, when landing on a thin-walled working part 2 along a helical line, the curvature centers of the bends of the bridges a lie on the helical surface. In working condition, the transverse overall size of the mandrel increases due to the total helical deformation of the straight thin-walled working part 2 of the housing 1, and this deformation is uniform in length, and the deformation value 0 the wall working part 2 of the housing 1 of the part is turned out to be uniformly clamped along the entire length. Invention Formula An expanding mandrel, in the case of which an elastically deformable element is located, has support and pressure sleeves, characterized in that, in order to improve the fixing accuracy, through-slots are made on the surface of the elastically deformable element that form equal jumpers interlaced with each other in the axial direction from the condition formation of a screw surface. Aa Phi21 but