SU632426A1 - Blank-extruding apparatus - Google Patents

Description

The invention relates to the processing of metals by pressure, in particular to pipe-profile presses.

A device for extruding blanks is known, comprising a press stamp, a container capable of moving from an individual drive in the direction of travel of the press clamp with a speed greater than the speed of the latter, and a matrix mounted on the entrance BOTTOM 1 into the container.

However, the known device has a complex structure and a large power consumption due to the presence of individual privat. A non-displacement container.

The closest known solution is a device comprising a container mounted with adjustable axial movement, made in the form of a sleeve with a stepped cavity enclosed in a sleeve with a conical transitional portion, a hollow punch carrying a die, as well as a bore into a cavity of a smaller diameter of the sleeve. in the cavity of the sleeve with a large dia meter press-bearing bearing press washer 2.

However, in the known device, the removal of the press residue is difficult.

The purpose of the invention is to facilitate the removal of the press residue.

For this purpose, the working end of the pressweig is made with feather | 1f (with a chamfer with a taper, corresponding to the taper of the transitional section of the container, and a central conical V11ad1 11oG1. Matching chamfer surface.

FIG. 1 image of the proposed device in the beginning of the pressing;

in fig. 2 the same, when setting

pressing process; in fig. 3 - then at the final moment of pressing; on f |; g. 4 - the same, in the process of separation of the lresscaptic.

The device contains a holder 1 with an annular protrusion-wiorn.m 2 and a concentric bushing 3 entering it with the possibility of axial displacement; the concentric bushing 3 is displaced. The inner nojrocTb bushing is made of two communicating concentric chambers 4 and 5 of different diameters connected by a conical 1 6. The size 4 dimension of diameter includes a new punch 7 bearing HL; the end face of the matrix 8, and in the chamber 5 of the larger DNM - a press stamp 9 with a press washer 10, on the front edge of which there is a chamfer 11 of the same taper as the conical transitional juice 6. At the working end of the press washer there is a central conical depression 12 with an angle at the apex of a cone 2a 90-150 °. The diameter of the base of the cone is determined by the relation B - (0.05-0.1) E, where d is the diameter of the smaller core of the container sleeve and E is the diameter of the container sleeve. The conical surface of the depression 12 mates with the conical surface of the chamfer 11. The sleeve 3 is packed with a peripheral annular recess 13, corresponding in shape and dimensions to the annular protrusion-stop 2 of the yoke. The sleeve 3 interacts with the plunger of the hydraulic cylinder 14 pressure. Opposite orts sleeve 3 is rigidly connected with tami. 15, freely passing into the opening of the crosspiece 16. The length of the chamber 5 of a larger diameter is 0.25-0.3 of the total length of the sleeve 3 of the container, in this case the ratio of the larger diameter of the cavity of the sleeve (chamber 5) to the smaller diameter (chamber 4) lies within 1,, 7. Position 17 denotes a blank, placed in a smaller chamber 4 sleeves, 18 - formed in the chamber 5, the flange of the blank, and position 19 - the resulting press product. The chamber 4 of the container sleeve is matched in diameter with the punch 7 and the matrix 8 fixed on it, and the chamber 5 - with the press-stamp 9 and the press washer K).

The device works as follows.

The heated billet 18 is placed in a smaller chamber 4 of the sleeve of the container until it stops in the matrix 8, and the sleeve 3 at the time of loading the blank is retracted to its original position. The length of the workpiece in this case is chosen so that its rear end protrudes beyond the transitional conical 6, taking up part of the volume of the adjacent chamber 5. Then the press ram 9 from the drive is moved in the direction of the matrix 8, and the press washer 10 comes into contact with billet 18, cuts into its end with its edge formed by chamfer 11 and conical hollow 12 (see Fig. 1). As a result, a part of the billet metal, located closer to its periphery, fills the annular space between the extrusion chamfer 11, transitional 6 and the side wall of chamber 5, forming the flange of the billet 18. With further movement of the press-stamp, the force is transmitted simultaneously to the end of the billet and through the flange billet 18 - on the sleeve 3 of the container, which comes in motion with the metal of the billet and the press shtemp. From the channel of the matrix 8, the press-product 19 begins to be extruded (Fig. 2). The total drive force of the ram is now divided into two parts, one of which extrudes the workpiece and the other moves

sleeve 1 in holder 1 towards matrix 8. Resistance to movement of sleeve 3 is exerted only by the forces of the inner surface of chamber 4, where the bulk of the workpiece is located, and the pressure of the plunger of hydraulic cylinder 1 1, which interacts with the front end of the sleeve. The hydraulic cylinder nodora necessary in the initial - the pressing stage for

The start of the outflow, and at steady-state outflow, to regulate the kinematic coefficient K, where the speed of movement of the sleeve of the container;

Y p, g, the speed of movement of the press-piece5 sang.

During the pressing process, metal is continuously fed into the flange of the blank 18, which presses the container sleeve from the end of the press washer. In this case, the flange of the workpiece

 18 is thickened, and the sleeve 3 is ahead of the press-stamp 9, i.e., the ratio VBT "- V," o .-, r. Thus, from this point on, the pressing process proceeds in the mode of active pressing, when the friction forces between the workpiece material and the cavity walls of the container sleeve do not hinder, but contribute to the expiration. At the end of the working stroke (ciM. Fig. 3) the sleeve 3 of the container with its peripheral recess 13 comes into contact with the protrusion-stop 2

0 of the clip 1, and the movement of the sleeve is stopped. In this case, the thickened flange of the blank 18 becomes part of the press residue. Zatom.M press stamp 9 tell the reverse, withdrawing it to its original position to load the next billet. In the course of the return stroke, the traverse 16 acts on the heads of the pullers 15, which thereby feed back the hub of the container 3 rigidly connected with them. As a result of this movement, the conical juice of the sleeve 6 rolls the flange of the workpiece 18 to the diameter of the chamber 4 (see Fig. 4). Thereafter, the press residue article 19 is withdrawn from the container sleeve along with the punch 7 and the die 8, and then the press residue is separated from the article using known means, after which the cycle is repeated. Making the working end of the press washer with a chamfer corresponding to the taper of the conical transition over the bushing connecting the bushing chamber and with the central conical trough simplifies the design of the press and facilitates forming the flange from the pressed billet and removing the press residue.

Claims (2)

1. USSR author's certificate “Vo 296610, cl. B 21 C 27/00, 1971. 2. US Patent L 2920760, MKI 72-259, 1960. 12 ts Fig- t 8 3 Н t / " FIG. 3 Fy