SU1225648A1 - Method and apparatus for manufacturing tubular articles with a flange - Google Patents

Abstract

1. A method of manufacturing tubular parts with a flange, including creating a uniform pressure on the inner surface of the workpiece using an elastic medium and shaping the flange, characterized in that, in order to increase productivity by making two parts at the same time, the flange part of the workpiece is preformed to form a torus the surface, the strain intensity does not exceed the critical, then the torus surface is cut with the simultaneous shaping of two flanges .. SSESS N 5 Yu SL About 4. 00 Figure 1

Description

2. A device for the manufacture of tubular parts with a flange, comprising a split matrix with an annular groove made on its inner surface and an elastic medium placed in the matrix, characterized in that it is provided with an annular knife placed in the groove with an cutting edge on the inner surface, cutting edge formed by intersection sto1

The invention relates to the processing of metals by pressure and can be used in mechanical engineering, the manufacture of aircraft, non-ferrous metallurgy.

The purpose of the invention is to improve productivity by manufacturing two parts at the same time.

Figs 1-5 show the dynamics of the process of manufacturing parts with a flange, including the stages of pre-deformation and impact of the deformable part of the workpiece with the cutting edge of the knife and the final shaping of the flanges, as well as the distribution of the main linear deformations at each stage; in fig. 6 shows a device for producing tubular articles with a flange.

The device contains a split matrix 1, the piston 2, the rod 3, the stop 4, the elastic sleeve 5, the annular blade 6 and the workpiece 7,

The essence of the method is as follows. At the first moment, the workpiece is freely deformed to the formation of a torus surface. The main linear deformations and intensity of deformations arising at this moment, and, consequently, the stresses in the deformable material, are less than the maximum permissible ones.

Values of 1x deformations can be calculated from geometric parameters.

.. (I

R

 - (-M

(21

the radon of an isosceles triangle with a base equal to the width of an annular knife, and the distance from the cutting edge of the knife to the inner surface of the matrix is determined by the ratio rbO, 6V, where B is half the width of the knife, mm,

3. The apparatus of claim 2, wherein the angle is that the angle at the vertex of the isosceles triangle is between 20 ° and 60 °.

, -one; NW)

S S d-f) (1st :)

(M

 {() 4t ;-) 4, (5)

ten

6 С

where e,,, are the main linear deformations arising in the first stage of deformation of the flange material; - intensity of deformation during preliminary deformation;

t 1 - allowable value of the intensity of the deformation of the material; F - current value

pre-deformation;

 outer radius

tubular billet;

B - half the width of the deformable part of the workpiece;

-% - initial thickness

tubular walls for-. cooking;

Si is the current thickness of the deformable wall of the tubular billet. Further, the deformable part of the preform is collided with the cutting edge and

cut into two pieces. Then the flanges of both parts are finally etched.

The modified stress-strain state is described by other formulas. For them, the amount of deformation after cutting 4 N is determined by the formula DN H-F (Fig. 1),

LN

2R

 S-S, (1d

2R7

the day.

.

R S is the main line deformations arising in the second stage of deformation (after cutting);

radius of the middle of the wall thickness of the workpiece; final flange thickness.

{3

t (

.-.

.) H, s.

where, €.

 ,

 main line deformations after both stages of deformation; intensity of deformations after both stages of deformation. If condition f is fulfilled, the deformations occurring in the flange material will not exceed permissible values and the integrity of the material will not be disturbed. At the time of cutting, the deformation process changes significantly. Flange size H is determined by path length L

 R, C6)

s.-arcos

(7)

Ы - half of the central angle,

formed by an arc of a circle connecting the cutting edge of the ring knife and the edge of the groove;

R is the radius of the arc passing through the cutting edge and groove edge.

From geometric ratios

we derive

llf

2F

arc sib I

26 F

from 8)

as a result of calculations and experiments, the ratios of the parameters P, 8 and H are determined. The necessary values of F and B are finally refined after calculating by formula (8),

The cutting edge of the knife 6 is set at a distance F (FIG. 1) from the inner surface of the die. The ring knife has the shape of an isosceles triangle with a vertex angle of 20-60 °. At angles less than 20 °, the strength of the knife decreases. If the angle at the tip is more than 60 °, then the deformation conditions deteriorate, since the deforming flange can touch the surface of the knife and brake. In addition, polyurethane flow conditions deteriorate during final flange shaping.

The device works as follows.

The rod 3 together with the piston 2 moves to the left under the action of a power cylinder (not shown). The elastic sleeve 5 is compressed between the stop 4 and the piston 2 and creates a uniform pressure on the inner surface of the tubular workpiece 7,

When using the proposed method and device, the energy consumption for cutting and plastic deformation of the flange is significantly (up to 75%) due to the fact that the rigidity of the deformable section decreases, as its area increases approximately twice; low energy consumption for cutting is required, since the annular knife creates stress concentrators in the deformable section and internal stresses directed along the axis contribute to the separation of the material; the inertia of deformation of the workpiece is used, since the workpiece hits the knife at a certain speed, which is especially significant under pulsed loading (magnetoimpulse, electric-impulse),

Thus, when using the proposed method and us. productivity to obtain tubular parts with a flange increases productivity by 1.5-2 times due to

combining operations and obtaining two parts at once from one workpiece. The proposed scheme allows to reduce the required specific pressure during cutting and flanging by 25-75%, as well as to obtain maximum degrees of deformation due to the preliminary deformation.

The experiments were carried out on pipes with an outer diameter of 30 mm and a wall thickness of KJi 0.75 mm. Parameter B is from 1 to 10 km, from 0.3 to 2 mm. For example, when tt 3 1 mm is calculated) 1Y size

, 0 mm, 6 mm. In this case, we specified FfeiiEibm according to the formula (8) size ,, 079 mm. The specific pressure required when receiving the flange size, 1 mm, with the proposed scheme 37 MPa, and with the known 54 MPa „

.z

.З

bl

Vuz.S

Compiled by I. Lanska Editor V. Petrash Tehred I. Weres Corrector V. Butt

Order 2020/8 Circulation 783 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

FIG. 6

Claims (3)

1. A method of manufacturing tubular parts with a flange, including creating uniform pressure on the inner surface of the workpiece using an elastic medium and shaping the flange, characterized in that, in order to increase productivity by manufacturing two parts at the same time, the flange part of the workpiece is pre-deformed to form torus surface, and the strain rate does not exceed critical, then the torus surface is cut with the simultaneous formation of two flanges. Fi d. 1 to to SL oo 2. A device for the manufacture of tubular parts with a flange, comprising a detachable matrix with an annular groove made on its inner surface, and an elastic medium located in the matrix, characterized in that it is provided with an annular knife placed in the groove with a cutting edge on the inner surface, the cutting edge is formed by the intersection of the sides of an isosceles triangle with a base equal to the width of the ring knife, and the distance E from the cutting edge of the knife to the inner surface of the matrix is determined accordingly F60.6B, where B is half the width of the knife, mm, 3. The device according to claim 2, wherein the angle at the apex of the isosceles triangle is 20-60 °. , devices, increased production