SU1444081A1 - Arrangement for rolling powder - Google Patents

Abstract

The invention relates to powder metallurgy, in particular, to devices for rolling powder. The goal is to increase the quality of rolled products. After filling the powder into the cavity formed by the flexible tape 7 and plates 5, fixed on the bed 1 with pressing to the end surfaces of the rolls 2, the punch 15 is inserted into the roll gap, drive the winders 8 and pre-compaction of the powder is performed winding tape. The punch 15 is returned to its original position and the powder is rolled, simultaneously driving the rolls and the winders. The quality of the products is enhanced by reducing the unevenness in the cross-section of the product and forcing the powder to be fed into the rolls, which increases the gripping angle. 2 ill., 1 tab. with (L with

Description

Ni ::

four

The invention relates to powder metallurgy, in particular, to a device for rolling powder.

The purpose of the invention is to improve the quality of products.

FIG. 1 shows the relative position of the elements of the device, on the right side - at the beginning of rolling, and on the left side - at the end of rolling; FIG. 2 is a section A-A in FIG.

The device contains a bed 1, work rolls 2 with necks are placed in pillows 3 installed in the opening of bed 1 with the possibility of returning the translational movement, the pressure screws 4 are connected with pillows 3 (the drive of screws is not shown). Plates 5 and 6, located between pillows 3 and the ends of the barrels of work rolls 2, are fixed on the bed perpendicular to the axis of rotation of the rolls, while the plates are installed with a gap between the pillows 3 and with a gap d between their ends and roll necks, and the plates are pressed to the ends of the barrels of work rolls.

The device is provided with a tape 7 and two coilers 8 for rewinding a metallic tape, the ends of which are rigidly fixed on the coilers. The width of the belt 7 is equal to the length of the barrel of the rolls 2, its length is chosen from the condition that it is possible to form loops of required sizes between the plates 5 and 6 for placement inside its original powder. I

The spring-loaded pinch rollers 9 are intended to press the metal band 7 onto the work rolls 2, and guides are attached to the pillows 3; ruler 10 for the orientation of the resulting product. In the upper part, the frame is installed with the possibility of reciprocating movement along the axis of the work rolls in the guides 11 of the support 12. On the support 12 there is fixed a hydraulic cylinder 13, designed to create counterpressure, and at the end of its rod 14 a replaceable punch 15 with an elastic working tip is fixed 16 (e.g., polyurethane) to completely overlap the throat of the rolls, while the shape of the working surface of the tips 16 has a concave configuration to obtain a product with the ends of the same shape, since the rear end of the rolled strip molded by metal ™

Yu

15 20 25

zo

40 45 CQ

35

Coy tape and convex.

The device works as follows.

At the initial moment, the metal tape 7 is located on the front side of the rolls 2 in their throat, the support 12 with the hydraulic cylinder 13 and the punch 15 are retracted beyond the rolling zone. Then, the rotation of the pressure screws 4 is turned on by moving the pillows 3 with the rolls to a predetermined amount corresponding to the thickness of the rolled strip, while the ends of the roll barrels are moved along the surfaces of the plates adjacent to them. When the drive of the rolls 2 (not shown) is turned on, the tape 7, twisting from the winders 8, closes the loop-shaped position shown in FIG. 1 on the right side, after which the drive of the rolls 2 is turned off. In the cavity formed by a loop of metal tape 7 and plates. 5, 6, the powder is loaded, and then the support 12 with the hydraulic cylinder 13 and the punch 15 is returned to the rolling zone, then oil is fed into the upper cavity of the hydraulic cylinder 13 from the hydraulic system (not shown), and the rod 14 and the punch 15 associated with it are inserted into the shed of the rolls 2 between the plates 5 and 6.

Then, the drive of the winders 8 (not shown) is turned on, winding the tape 7 onto the drums of the winders, thereby reducing the size of the loop located behind the rolls 2, which leads to a decrease in the closed volume occupied by the powder, and, consequently, to its preliminary compaction, however, the degree of pre-compaction of the powder can be changed by changing the back pressure forces created by changing the oil pressure in the hydraulic cylinder 13,

Upon reaching the predetermined degree of pre-compaction, the reel drive is disconnected, the rod 14 with PZ Ansone 15 is returned to its original position, and the support 12 from the drive (not shown) is shifted outside the rolling zone. Then, the drive of rolls 2 and iotax 8 are simultaneously turned on. carried out the rolling strip. After the end of the rolling process, the drive of the rolls and coilers is disconnected and the rolled strip is removed by a removable device.

3

(not shown), for example, a crane with supplies.

The device allows pre-densification of the powder in a closed volume, which in the rolling process leads to an improvement in the quality of products by reducing the unequal-ratio in the cross section.

Installing plates with gaps between the pillows and the necks of the rolls allows movement of the work rolls with pillows when the thickness of the curved strips changes.

The table presents the result of testing the properties of products with different sizes of iron powder ПЖ2М2, made on the proposed and known devices,

The diameter of the work rolls in the known and proposed devices is equal to 1000 mm, and the barrel length is 300 mm. Back pressure in the proposed

unequal density of the workpiece in cross section on average by 25%, and therefore, improve the quality of rolled strips, as well as increase the angle of capture.

Claims (1)

Invention Formula A device for rolling powder containing a bed, work rolls with necks placed in pillows, pressure unit, auxiliary rolls, flexible metal tape in contact with a part of the cylindrical surface of the auxiliary rolls, characterized in that, in order to improve the quality of the products, it is provided with a punch elastic tip to create a counterpressure on the pressed product with plates fixed on the steel, in the plane perpendicular to the axis of rotation of the rolls, with the possibility The device on the side of the punch should be pressed against each of them against a constant and equal to 300 kN. The rolling speed in both devices was 1.2 m / min. It follows from the table that the use of the proposed device for rolling the powder makes it possible to reduce Note. JL - angle of capture; K - inequality coefficient in cross section of the workpiece. the positive end surfaces of the barrels of the work rolls, and the winders to rewind the flexible tape, with the ends of the tape attached to the winders, and the width of the flexible tape is equal to the length of the roll barrel. I.i X // Editor A. Dolinich Compiled by A. Dzhetimov Tehred M. Didyk Order 6429/13 Circulation 741 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 x7- / .2 Corrector I. Muska Subscription