SU1402382A1 - Tool for drawing tubes - Google Patents

Description

(21) 3939708 / 23-02

(22) 07.08.85

(46) 06/15/88. Bnsh. No. 22

(71) Ural Research Institute of the Pipe Industry

(72) V.V. Yakovlev, A.A. Vais, V.A. Shurinov and V.A.Bel Vin

(53) 621.774.107 (088.8)

(56) Savin G.A. Pipe drawing M .: Metallu 1, 1982, p. 102

Rozov N.V. Cold drawing steel pipes. M .: Metallurgi, 1965, p.43, Fig.13 (6).

(54) TOOL FOR PIPE DEVELOPMENT

(57) The invention relates to the processing of metals by pressure, namely the drawing of pipes on a fixed mandrel. The goal is to eliminate technological capabilities by obtaining pipes with a channel eccentric in relation to the outer surface. The tool for drawing pipes contains fiber with inlet and outlet ends. The working surface is formed by conical and cylindrical sections, while the mandrel is filled with an additional cylindrical section, and the portage - with additional conical and cylindrical working sections. This tool provides eccentric pipes. 1 il.

SL

s ±

The invention relates to the processing of: metals by pressure, in particular to the use of pipes on a fixed mandrel.

The aim of the invention is to expand the technological possibilities by producing pipes with an eccentric channel with respect to the outer surface.

The drawing shows the proposed technological tool, the cut.

The tool contains fiber 1 with an additional conic section 2

: with additional cylindrical section 3j mandrel 4, main conic section 5 of die, calibrating cylindrical section 6 of die, cylindrical plug 7, pipe 8, erased: gin 9.

The proposed technological i

; The structure provides eccentric pipes as follows.

Used dredge 1 containing worker

a channel in the form of successively alternating pairwise tapered 2 and 5 and cylindrical 3 and 6 sections, a pipe 8 is introduced with a chained drawing head (gripper). A mandrel is then inserted into the pipe.

a rod 9 consisting of two cylinders; plots, proper frames; , ki 4 and cork 7 at its end. When this: tube 7 is offset relative to the axis I of the mandrel 4 by a specified amount e. I When the pipe is grabbed by the drawing trolley, the mandrel moves to the working position and then the eccentric tubes are drawn on the fixed mandrel.

Example, Application of the proposed technological tool for the manufacture of pipes with a channel biased relative to the external contour, used as a blank for eccentric bushings of tractor tracks.

Size of finished pipe, mm: Outer diameter 70 Inner diameter 45 Eccentricity 2.5 Minimum wall thickness10

Wall thickness 15

Pipe material - steel 20. According to the outer dimension of the finished pipe, the diameter of the cylindrical section 6 (calibrating section) of die 70 mm is selected. Qi diameter

The mandrel section (plug) J located in the area of 7 is located in the region of the said section of the die 45 mm. It is offset relative to the axis of the first cylindrical section of the mandrel 4, and consequently, the axis of the workpiece 2.5 mm. The radius of the first cylindrical section (barrel) of the mandrel 4 is calculated from the condition

R, Rj + E + S

where R ,, R is respectively the radius

the first and second cylindrical sections of the mandrel;

e is the eccentricity value; S is the gap between the forming lines of the first and second cylindrical portions of the mandrel in the axial plane, 5 0 ,,,,, e.

For this example, S is assumed to be 1 mm, then R, 26 mm.

The diameter of the first cylindrical section 3 portages is equal to:

d, 2 (R, + tc),

where t,

average wall thickness of the finished pipe.

thirty

35

H

 m | n J | t Tii5; jj

from dm 77 mm.

The length of the first cylindrical section of the die 1 is chosen from the condition that excludes deformation of the wall from the overlap and the moment of forces when forming the difference wall thickness on the mandrel.

Kt

ka

where F is the contact area of the tube

mandrels with a pipe; - the contact area of the barrel mandrel with a pipe,

whence 1, jc- 26 mm.

K1

With the known parameters of the tool and the finished pipe, the size of the workpiece is selected. The size of its internal diameter should provide free entry of the mandrel into the billet channel, and the wall thickness should be equal to or greater by 3-5% of the average thickness.

walls of the finished pipe. Taking into account the broken, the size of the workpiece is 85 13 mm,

Before deformation of the workpiece, appropriate preparation of its surface is carried out.

Pipe drawing with a draw ratio of 1.3 is performed on a conventional

linear mill. When deformed by an arbitrary cylindrical section, it bypasses the displacement of the pipe channel relative to the outer contour.

Claims (1)

The proposed technological tool allows eccentric tubes to be drawn by drawing. Invention Formula A tool for drawing pipes containing a mandrel, fiber with inlet and In the direction of drawing, the axis of which is eccentric to the axis of the mandrel, the portage is made with additional conical and cylindrical working sections 15, with an additional section of the mandrel located inside the cylindrical section of the portage adjacent to its output end. output ends and a working surface formed by conical and cylindrical sections, characterized in that, in order to expand technological capabilities by obtaining pipes with a channel eccentric with respect to the outer surface, the mandrel is provided with an additional cylindrical section facing the side of the drag, the axis eccentric axis of the mandrel, the portage is made with additional conical and cylindrical working areas, with an additional portion of the mandrel located inside the cylindrical second die portion adjacent to its outlet end.