SU1282945A1 - Arrangement for expanding tubes into cone - Google Patents

Abstract

The invention relates to the field of metal forming, namely, devices that change the diametrical dimensions of pipes, and can be used in mechanical engineering. The invention provides an improvement in the quality of pipes being distributed on a cone due to the fact that it is equipped with a unit of differentiated rigid support for the edge of the workpiece, made in the form of a set of concentrically arranged rings, and a mechanism for their independent axial movement. Moving the rings (K) 4 to the lowest position ensures that the edges of the working surfaces K contact the surface of the punch 1. Distribution of the workpiece occurs in the gap between the punch and the holder 2. As the distribution progresses, the edge of the collar abuts the working surface K 4, where a cavity is formed and the gap is filled with the workpiece material with simultaneous thickening of those parts of the workpiece that have thinned at this stage. The process is then carried out in a similar manner. 1 il. f

Description

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The invention relates to the processing of metals by pressure, in particular to devices that change the diametrical dimensions of pipes, and can be used in mechanical engineering for the production of tapered parts.

The aim of the invention is to improve the quality of machined parts.

The drawing shows the proposed device, the cut.

The device contains a punch 1, the top described for the moment of raising the next ring 4 is determined by the magnitude of the distribution force, which at the time of filling the gap increases sharply, or by the magnitude of the axial stirring, and the pusher 3, and the lifting of the next ring 4 can devices are carried out automatically.

At the end of the distribution process, the yoke 2 is loosened and the resulting

which has an axial bore, fitting part.

innovation relative to the punch 1 with Zazo-Differentiated hard back

the edges of the billet provides a symmetrical distribution of the billet in the meridional direction, eliminates the "bristle billet holder 2 with a through cavity, the pusher 3, made in the form of a rod with a stepped outer surface, installed with the possibility of its

a smaller step in the axial hole of the punch, hence its premature sleep 1, and a larger step in the cavity failure, regulates the wall thickness of the resulting workpiece by setting the required clearance between the punch 1 and the rings 4,

ki, prevents thinning of the edge, and increases the purity of the outer

clips 2, a unit of differentiated rigid support for the edge of the workpiece, made in the form of a set of concentrically arranged rings 4, covering the case 2 jo of the workpiece surface and reduces the effort of the workpiece free and connected to the mechanism 5 of them.

The thickness of any ring 4 can be determined from the conditions for ensuring the distribution of the pipe in this area without failure and the conditions for deforming the workpiece without the part being produced. The original gap between pu- 25 stability.

an anson 1 and a yoke 2 is established. The thickness of the ring according to the first condition

approximately determined by the expression - t RI b

The axial movement, for example, with the help of t g 6. At the ends of the rings 4 facing the punch 1, there are working surfaces, the shape of which is determined by geometry, for example, the height of the wall of the housing 7.

UO (1)

thirty

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The device works as follows.

The sleeve 2 is set relative to the punch 1 with a gap, for example, equal to the thickness of the original tubular billet, and secured to the housing 7, for example, by means of bolts. Using the axial movement mechanism 5, made, for example, in the form of a screw-nut pair, the rings 4 are moved to the lowest position until the edges of the working surfaces of the rings come in contact with the surface of the punch 1. The tubular billet is placed on the pusher 3 and the latter is placed in the through-hole of the casing 2 Under the action of, for example, the press version, the axial movement of the pusher 3 is carried out. As a result, the workpiece is distributed in the gap between the punch 1 and the yoke 2. As the distribution progresses, the edge of the workpiece rests on the working surface RI - Cored oil radius of the ring;

b - the value of uniform elongation of the material of the workpiece at the dispensing temperature, taking into account the pre-strengthening. The thickness of the ring, according to the second condition, should not exceed the value at which the edge of the workpiece is approximately twice as thin and it becomes possible to lose its stability (corrugation) at the stage of filling the gap:

, 75R2, (2)

where R2 is the outer radius of the ring.

Calculations (1) and (2) show that when distributing pipes with a diameter of 15-120 mm with heating from wrought aluminum alloys, titanium and steel with a distribution factor of up to 0.5, 1-2 rings are needed, with

the ring 4, the g deity in the result of e-distribution with a distribution factor of up to 0.2 tact of the edge of the ring 4 with the surface of the punch 1, forms a closed cavity, and the established gap is filled with the material of the workpiece with a simultaneous thickening of those parts of the workpiece distribution stage. After filling the specified gap, the central ring 4 is lifted and set with a gap relative to the punch 1, for example, equal to the thickness of the original piece. Again

carry out the distribution of the pipe and filling jj 430 ° C. As a result, an equally set clearance was obtained between the punch 1, thick parts with a 90 ° taper angle of the sleeve 2 and the central ring 4. Further, the difference in diameters of 16:75 (the coefficient of the dispensing process is similar to the distribution of 0.22). At the same time, the details had purely 50

-3-4 rings of approximately the same thickness.

Example. The device was tested during the distribution of pipes 016X1.0 mm from material AMgbM. The node of the differential support of the edges of the billet and had two movable rings, which were lifted in the process of distribution manually. The device provided a support for the workpiece on diameters of 35, 55 and 75 mm. The deformation was performed with heating to

but described The moment of raising the next ring 4 is determined by the magnitude of the distribution force, which increases sharply at the time of filling the gap, or by the amount of axial stirring, of the pusher 3, and the lifting of the next ring 4 can be carried out automatically using known servo devices.

At the end of the distribution process, the yoke 2 is loosened and the resulting

 This, therefore, its premature destruction, regulates the thickness of the wall of the semi-shell, prevents the edge thinning and increases the purity of the outer

 part surface and reduces the work force of the workpiece.

approximately determined by the expression - t RI b

UO (1)

where RI is the inner radius of the ring;

b - the value of uniform elongation of the material of the workpiece at the dispensing temperature, taking into account the pre-strengthening. The thickness of the ring, according to the second condition, should not exceed the value at which the edge of the workpiece is approximately twice as thin and it becomes possible to lose its stability (corrugation) at the stage of filling the gap:

, 75R2, (2)

where R2 is the outer radius of the ring.

distribution with a distribution coefficient of up to 0.2

430 ° C. As a result, uniform thickness details were obtained with a taper angle of 90 ° and a difference in diameter of 16:75 (a distribution coefficient of 0.22). The details were pure

-3-4 rings of approximately the same thickness.

Example. The device was tested during the distribution of pipes 016X1.0 mm from material AMgbM. The node of the differential support of the edges of the billet and had two movable rings, which were lifted in the process of distribution manually. The device provided a support for the workpiece on diameters of 35, 55 and 75 mm. The deformation was performed with heating to

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That external surface of Pr, had no “sinkers and was axisymmetric.

Compared with the base object, the proposed device provides an increase in the purity of the outer surface of the part by a factor of 2-2.5, making it possible to obtain axisymmetric parts.

Claims (1)

Invention Formula A device for dispensing pipes onto a cone containing a conical punch, at the apex of which an axial bore is made, a clip with a through axial cavity, installed with a gap relative to the punch, and a stepped plunger, the entrance is w, in a smaller step into the hole of the punch, characterized in that, in order to improve the quality of workpieces, it is equipped with a unit of differentiated rigid backing of the workpiece edge made in the form a set of concentrically arranged rings covering the cage, and a mechanism for their independent axial movement, with the ends of the rings facing the punch made with a taper angle equal to the taper angle on.