SU1340937A1 - Method of producing composite broach - Google Patents

Abstract

The invention relates to metalworking and can be used in shipbuilding and mechanical engineering in the manufacture of tools for machining surfaces of parts by the method of drawing. Pel of the invention is to improve the quality of manufacturing the tips by eliminating external force action leading to the emergence of vibration concentrators in the material of the mandrel and creating conditions for damping vibrations in the material of the mandrel. The mandrel 1 is made of a material with a shape memory effect. Reducing the diameter of the mandrel 1 is possible by performing the last hollow with the subsequent extrusion of longitudinal corrugations on its outer surface. Reducing the diameter of the mandrel I is also possible by simultaneously twisting and stretching it. After reducing the diameter of the mandrel 1, cutting elements in the form of rings 2 are put on it, in which the inner surface is preliminarily conical. Further, the fixing of the cutting elements on the mandrel 1 is carried out by heating the latter to a temperature that exceeds the temperature exhibiting the shape memory effect in the material of the mandrel 1, which leads to the restoration of the mandrel 1 to its original size. When this occurs, the process of diffusion welding between the mandrel 1 and the fingers 2. 2 Cp. f-ly, 1 ill. (L 00 o; o 00

Description

The invention relates to metalworking and can be used in shipbuilding, mechanical engineering in the manufacture of tools for machining surfaces of parts by the method of drawing.

The purpose of the invention is to improve the quality of manufacturing the beads by eliminating the external force action leading to the appearance of vibration concentrators in the material of the mandrel and creating conditions for damping vibrations in the material of the mandrel.

The drawing shows a scheme for the method of implementation. .

The drawing shows a mandrel 1 and cutting elements in the form of rings 2 with conical surfaces.

The method of manufacturing the composite protrusion-20 by compressing the cutting elements 2 with the reinforcement is implemented as follows;

The mandrel 1. is made of a material with a shape memory effect, for example, titanium nickelide of equiatomic composition.

Reducing the diameter of the mandrel 1 is possible by performing the last hollow in the form of a pipe. In particular, a Ni – Ti alloy pipe with an outer diameter of 16 mm and a wall thickness of 2.0 mm.30 spirit was taken to prevent the oxidation process.

Extrusion on the outer surface

mandrels 1 longitudinal corrugations diameter

mandrels reduced to 14,4 mm, -

This plastic deformation of the mandrel 1

accounted for 10-15% of its geometrical- 35

who size.

It is possible to reduce the diameter of the mandrel 1 by simultaneous twisting and stretching at the university, and the broken oxides are squeezed out along the conical inner surface of the cutting element 2 onto the outer surface of the mandrel 1. A further increase in temperature to 800 ° C leads to a loss of reversibility properties of the shape memory effect in the material mandrel and 1 providing high quality of the manufactured broaching, because

the greasy discharge machine DU-19 with the cutting elements inside it is securely inserted for heating (not shown). fastened and at any temperature ek- Then the mandrel 1 with a reduced outer diameter is put on the cutting edge elements in the form of rings 2, in which

sploation and vibration loads the detachment of the cutting elements does not occur, since the material, which is opposed to the inner surface 45 of the shaft, extinguishes vibration, and on the mandrel

are conical in shape. Rings 2 are placed on the mandrel 1 with a given step.

Next, the cutting elements 2 are fixed on the mandrel 1, heating the mandrel I to a temperature exceeding the temperature exhibiting the shape memory effect in the material of the mandrel 1. For example, the heat treatment of the mandrel 1 starts at 20 ° C, at which its diameter was reduced and the cutting elements 2 were installed, and the temperature was brought to, followed by quenching in water.

When the temperature in the furnace reaches 105 ° C, the shape memory effect starts to appear in the material of the mandrel 1, leading to the restoration by the mandrel 1 of its original size (shape), in this case 16 mm in diameter. When restoring the shape of the mandrel 1, its material abuts against the surface of the conical profile of the internal profile of the inner rim of the annular cutting elements 2 and, meeting their resistance exceeding the plastic strain limit of the material of the mandrel 1, breaks the oxide films from them to produce juvenile surfaces. Contacting them in a range over them, mandrel 1 with elements 2 is diffusion-welded with simultaneous

30-60 kgf / mm and the formation between the cutting elements 2 annular shoulders 3, limiting in the axial direction the shear forces of the cutting elements 2. The material of the mandrel 1, restoring its shape, causes the oxides from the tense joints, activates the surface covers from ingestion of the surrounding carriage is welded, and the broken oxides are squeezed out along the conical inner surface of the cutting element 2 onto the outer surface of the mandrel 1. A further increase in temperature to 800 ° C leads to a loss of reversibility properties defects in the shape memory material of the mandrel-1 and providing high quality of manufactured tape transport, since

in it the cutting elements are securely fixed and at any temperature

sploation and vibration loads the detachment of the cutting elements does not occur, because in the material

no artificial vibration concentrators.

Claims (1)

1. A method of manufacturing a modular broach, including mounting and fixing cutting elements in the form of rings on a mandrel, so that in order to improve the quality of the fabrication of the broach, the inner surface of the rings is made conical molds, the mandrel is made of a material with a memory of the mold, 31340937 its diameter is reduced, while the mandrel is made hollow and after fastening the rings, the subsequent squeezing of the mandrel at its external thermal processing at the temperature surface of the longitudinal corrugations, which exceed the temperature of the left side, is carried out afterwards; 3, The method according to claim 1, distinguishing the shape memory with the material of the mandrel. dia2 The method according to claim 1, the difference of the mandrel meter is produced simultaneously with the fact that a decrease in diagonal twisting and stretching of the mandrel gauge is carried out at the pre-late for both of its ends.