RU2465975C2 - Method of making flat bottom in tube biller with central bore of required diameter - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming. Tube billet wall is subjected to plastic strain by flat working surface of spinning tool moving along rolling arc to make a fillet and a flat bottom with central bore. Note here that flat bottom is made together with drilling central bore by cutting tool secured perpendicular to spinning tool working surface plane at a distance from tube billet outer wall plastic strain start with due allowance for fillet length and central bore diameter.

EFFECT: higher efficiency.

2 dwg, 1 ex

Description

The invention relates to the field of metal forming and mechanical processing of metals, and may find application in the manufacture of tube blanks with a flat bottom and with a hole in the bottom.

A known method of manufacturing a pipe with a bottom part provided with a Central hole, including the deformation of the end section mounted on the mandrel and rotating relative to the longitudinal axis of the tubular workpiece by rotation of the forming tool located on the lever relative to the axis perpendicular to the axis of the workpiece, and the rotation of the lever is carried out relative to the axis located on the distance from the working surface of the forming tool corresponding to the radius of mating of the outer side surface finished part with its bottom part, in accordance with the layout of the workpiece and forming tool after deformation.

(RU 2324565, B21D 41/04, B21D 22/14, published 05/20/2008).

The disadvantage of this method is the need for great efforts on the pressing tool associated with the formation of a radius mate (fillet) of the side surface of the pipe and the bottom along the radius of curvature of the mandrel, as well as the low quality of the resulting central hole in the bottom of the pipe billet.

The closest in technical essence is the method of forming a flat bottom in the tube billet with a central hole, including plastic deformation of the tube billet wall with the flat working surface of a pressing tool moving along the rolling arc with the formation of a fillet (radial conjugation) of the tube billet wall and the flat bottom (sunset plane) ) with a central hole.

(Khovanov NN “Features of technology and equipment for forming bottoms with a central hole in tubular products”, journal “Technology of light alloys”, published by VILS, 2010, No. 3, p.66).

The disadvantage of this method is also the low quality of the obtained Central hole in the bottom of the tubular billet.

The objective and technical result of the invention is to increase the productivity of the method due to the simultaneous formation of a flat bottom of the workpiece and the bore of the formed central hole to the desired size.

The technical result is achieved by the fact that the method of forming a flat bottom with a central hole in the tube blank includes plastic deformation of the wall of the tube blank with a flat working surface of a pressing tool moving along the rolling arc with the formation of a fillet and a flat bottom with a central hole, while the formation of a flat bottom is carried out in combined with the bore of the central hole to the required size with a cutting tool fixed perpendicular to the plane of the working surface the surface of the pressing tool at a distance from the beginning of plastic deformation of the outer wall of the tube stock, taking into account the length of the fillet and the required diametrical size of the central hole.

The implementation of the method according to the invention can be illustrated by the example using a pressing tool (Fig. 1 and 2), where:

1 - pipe billet;

2 - pressing tool;

3 - a cutting tool fixed perpendicular to the plane of the working surface of the pressing tool;

4 - cutting edge of the tool;

5 - cut off allowance of the central hole.

The process of forming a flat bottom in the tube billet is carried out by plastic deformation of the tube billet wall 1 under the action of the flat working surface of the pressing tool 3 moving along the “abv” rolling arc with center at point “O” with the formation of a fillet (radial conjugation of the tube billet “ab” and flat bottom “bv.” Fig. 1 shows three positions of the pressing tool in the process of forming a flat bottom (3, 3 ', 3 ").

A pressing tool that provides movement along the rolling arc can have a different design solution, for example, can be made in the form of a plate located on the lever with the possibility of rotation about an axis perpendicular to the axis of the tube billet.

When forming a flat bottom, the central hole of irregular shape is simultaneously formed due to the uneven flow of metals on the edge of the central hole. For machining the central hole to the required size (removal of stock 5), a cutting tool, for example, a boring tool with a carbide plate, is fixed perpendicular to the plane of the working surface of the press tool. The cutting tool is installed at a distance from the beginning of plastic deformation of the outer wall of the tube stock, taking into account the length of the fillet and the required diametrical size of the central hole. Since the formation of a flat bottom is carried out during the rotation of the tube stock with a speed ω, then at the final stages of the method, the cutting edge 4 of the cutting tool 3 sequentially cuts the allowance 5, forming a central hole of the required size.

Claims (1)

The method of forming a flat bottom in the tube stock with a central hole, including plastic deformation of the wall of the tube stock with a flat working surface of a pressing tool that moves along the rolling arc to form a fillet and a flat bottom with a central hole, characterized in that the formation of the flat bottom is carried out in combination with a bore the central hole with a cutting tool fixed perpendicular to the plane of the working surface of the pressing tool at a distance from the beginning of plastic deformation of the outer wall of the tube stock, taking into account the length of the fillet, and the required diametrical size of the Central hole.

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