SU1743694A2 - Roll unit for rolling profiles from powdered materials - Google Patents

Abstract

The invention relates to powder metallurgy. SUMMARY OF THE INVENTION: The powder material is defined in a caliber formed by a shoulder 2 of roll 1 and a stream 8, limited to two lateral 5, 6 and 7 central rings, and after passing through the deformation center it leaves the stream 4 of roll 3 together with an elastic band-band formed by rings 5 -7. The exit is facilitated by the use of a decompression device. The rigidity of the ring system 5-7 is provided by the wedging effect. 6 Il. co si VI cJ o che go F №2

Description

The invention relates to powder metallurgy, in particular, to devices for rolling profiles from powder materials.

Closest to the present invention, there is a roller set for rolling profiles from powder materials, which includes two rolls, the lower of which is made with a stream and the upper one with a shoulder. In addition, the kit is provided with an elastic ring-bandage placed in the stream of the lower roll with an outer surface corresponding to the surface of the lower roll stream and with a stream having vertical walls and an unclamping unit for elastic deformation of the ring bandage, while the protrusion of the upper roll is installed with a contact with the walls of a ring-band shroud, unclenching the unit is placed at the exit of the rolls, and the diameter of the band-ring is greater than the diameter of the roll. The one-piece shroud has low resistance due to the appearance of stress concentrators in the corners formed by the outer surfaces of the shroud ring, which leads to its fatigue failure.

The purpose of the invention is to increase the stability of the roller set.

This goal is achieved by the fact that in a roller set for rolling profiles of powder materials, an elastic ring-band is made of (three rings — two lateral and central, located between the lateral rings, with the possibility of contact with their inner surfaces, made inclined and converging to the axis of the lower roll or, at least parallel to the vertical plane of symmetry, the stream.

FIG. Figure 1 shows the roller set for rolling profiles from powder materials; in fig. 2, 3 - sections of the deformation zone with different contacts of the lateral and central rings; Fig 4-6 - embodiments of the ring band

The roller set consists of the first roll 1 (fig. 1, 2, 3) with shoulder 2, roll 3 with a cut stream 4 in which an elastic ring-bandage made of three rings — two lateral 5 and 6 — is placed (fig. 2 -6) and central 7, located between the side rings with the possibility of contact with their inner surfaces. Composite rings 5, 6 and 7 form a stream 8 (figs. 2, 3) of an elastic band-ring. Moreover, the side rings 5 and b are made in a special way with external surfaces corresponding to the stream profile 4 of the lower

roll 3. The central ring 7, located between the side. rings 5. 6, forms the bottom of the stream 8 of the elastic ring-bandage. The side and center rings have a diameter larger than the diameter of the roll 3 with the stream 4. The central ring 7 contacts with the side rings 5, 6 along the inner surfaces of the side rings 5, 6, which are made oblique and

converging to the axis of the lower roll 3 (Fig. 4, 5). In addition, the contact of the central ring 7 with the side rings 5, 6 is made along the inner surfaces of the side rings 5. 6, which are made parallel to the vertical plane of symmetry of the stream 8 (Figs. 5, 6). Unclamping node in the drawing is not shown.

Roll set works as follows.

The powder material is specified in a caliber formed by a shoulder 2 of roll 1 and a stream 8 formed by two side 5, 6 and 7 central rings. The rigidity of the system in the deformation zone is provided by the effect of jamming by the central ring 7 and the stream surface 4 lateral rings 5, 6.

After the passage of the deformation zone by the metal, it together with the elastic ring-bandage formed by the rings 5, 6, 7, due to the fact that the diameter of the latter is larger than the diameter of roll 3 coming out of the stream 4 of roll 3.

Using the unclamping device

the exit of metal from the gauge is facilitated and the coefficient of friction of the metal against the walls of the caliber is reduced.

Example 1. Rolled iron

powder brand ПЖРВ 2.200.26. The upper roller with a diameter of 120 mm had a collar with a diameter of 150 mm. The lower roll with a diameter of 120 mm had a stream with a cutting depth of 6 mm and a width along the bottom b mm. A caliber of 6 mm in depth was formed by two side and one central rings with outer diameters of 140 and 132 mm, respectively. Contact of the central ring with the lateral ones was carried out along the inner surfaces of the lateral surfaces.

0 lec, made inclined and converging to the axis of the lower roll (Fig. 4). A rectangular sectional profile with a thickness of 1.5 mm and a width of 3.5 mm was obtained with a relative density of 88-92%. Tool

5 is not destroyed.

Example 2. The same powder material was rolled on the same roll set as in Example 1, while the contact between the central and side rings was carried out on the inner surfaces.

side rings, one of which was made inclined and converging to the axis of the lower roll, and the other was parallel to the vertical plane of symmetry of the stream (Fig. 5). The tool is not destroyed.

Example 3. In a roller set with dimensions similar to examples 1, 2, the side rings are in contact with the central one along the inner surfaces of the side rings made parallel to the vertical plane of symmetry of the stream (Fig. 6). The tool is not destroyed.

0

Claims (1)

Claims Roller set for rolling profiles of powder materials according to ed. EV No. 1574369, characterized in that, in order to increase its durability, the elastic ring-bandage is made up of a composite ring - two lateral and central rings located between the lateral rings with the possibility of contact with their inner surfaces; the rings are made inclined / and converging to the axis of the lower roll or at least parallel to the vertical plane of symmetry of the stream. FIG. Fig.Z Vertikaldma & Leskosli symmetry 6 Fi.g. ten 3 s Fig 6 fe /) P40is0etb a / mme / gum / MANUAL Ti albma & / 1loss0 / g symmetry & / & $ 6 0uzS