SU1252052A1 - Apparatus for rolling powders - Google Patents

Description

Srig. i

The invention relates to powder metallurgy, in particular to powder rolling mills, and is intended for the production of semi-finished products, for example, shaped strips of shaped cross-sectional configuration of powder compositions.

The purpose of the invention is the expansion of technological capabilities by ensuring the possibility of obtaining profile strips.

FIG. 1 shows a kinematic diagram of a device for rolling powders; in fig. 2 - roll gauge in a plane passing through the axes of the rolls, a fragment of the section.

The mill consists of a bed 1, two cylindrical rolls 2, installed with an adjustable gap 3 in the supports 4 and connected to the electromotor 5 to drive them to rotate through the coupling 6, the gearbox 7 and the gear stand 8, the hydraulic cylinders 9 to pry the rolls, the hopper 10, the hinges 11. The forming surfaces of the rolls 2 are made in the form of protrusions 12 and depressions 13, joined by inclined faces 14 with the formation of a roll gauge 15.

The camp works as follows.

In the frame 1 of the rolling mill, rolls 2 with a profiled working surface are installed on the supports 4, forming a roll gauge 15. By adjusting the inter-roll spacing using the hydraulic cylinders 9 and pressing the rolls, the horizontal clearance of the roll gauge h is adjusted (Fig. 2) according to the thickness of the rolled profile , while the ratio of the gaps in the inclined horizontal parts of the caliber should satisfy the condition of 0.7-0.9

In case the ratio of gaps

caliber 5 0.9, the condition of equal strength is not complied with, 45 and the destruction of the rolled stock occurs along the protruding profile elements. With a clearance ratio of 0.7, there is a powder overflow in the inclined parts of the profile, followed by profile breaks. When the angle of inclination of the connecting faces of the caliber / 3 30 is possible, the rolled profile in the caliber can be destroyed.

Example 1. Rolling is subjected to iron powder brand PZH4M2. Rolling is carried out on the mill in a two-roll caliber formed by drive rollers with a profiled working surface obtained by alternating protrusions φ 150.4 mm and cavities ф 148.4 mm, joined by flat edges, tilted to the end surface of the rolls at an angle of 45 - caliber I and 30 - caliber 1G. The quality of the rolled metal bars is shown in Table. one.

From the example it follows that with respect to the gaps in the inclined and horizontal sections of the caliber Lg / Lg 0.7-0.9, there are no cracks and damage in the rolled strips.

PRI mme R 2. Similar to example 1, but the powder is rolled in calibers with different angles of inclination of the profile - 28, 30, 45 ° and 60 ° in the same mode. The quality of the rolled metal bars is reflected in table. 2

From example 2 it follows that a quality profile can be obtained in calibers having a slope of the conjugating faces of at least 30.

Raw rolled products obtained on the proposed device can be subjected to processing (laying, cutting, sintering) without destruction.

The application of the invention for the production of shaped strips of shaped cross-sectional configuration directly from powders allows, in comparison with a flat powder rental, to create new product designs.

thirty

thirty

2.1

45

thirty

28

1.8 0.90 The band goes continuously, there are no cracks and destruction

1.8 0.73 Same

1.8 0.71 The band is destroyed at the exit from the gauge along the protruding elements of the profile

Table 1

The band is destroyed at the exit of the gauge

The strip goes continuously, there is no breaking and breaking.

Also

The strip is destroyed at the exit from the gauge of the protruding elements of the profile

Spreadsheets

12

Claims (1)

DEVICE FOR POWDER ROLLING, including a connection with a roll rotation drive with forming surfaces forming an adjustable gap, and a loading hopper, characterized in that, in order to expand technological capabilities by providing the possibility of obtaining profile strips, the forming surfaces of the rolls are made in the form of alternating equally high protrusions and depressions conjugated by inclined faces to form a roll gauge with horizontal inclined sections, the inclination angle of the mating faces to the end surface of the rolls P - 30, and the magnitude relationship of the gap in the inclined and horizontal portions caliber h _M / h _r = 0,7-0,9. (/) srig. 1> ¹ 12