SU1745394A1 - Method and tool for making discs with central thickened portion - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to the methods and the 1 8 Fig 1 tools for forming by rolling. The creature is. that the part is stamped at stepwise deformation at the beginning of the central part with simultaneous restriction of the metal flow in the radial direction, and then, after finishing the thickening, the part is rolled to its final dimensions. In the tool for carrying out the method in the matrix 3, a ring 4 is installed with the possibility of axial movement by an amount equal to the height of the original preform 1, the inner and outer diameters of the ring 4 being equal respectively to the diameter of the original preform and the outer diameter of the disk. 2 sp.f-ly, 4 Il. Yo and cl with about 4

Description

The invention relates to the processing of metals by a total deposition and can be used in the manufacture of discs with a central thickening.

The purpose of the invention is the expansion of technological capabilities by increasing the maximum dimensions of manufactured discs.

Figure 1 shows the tool and the position of the workpiece at the design stage of the central thickening, a longitudinal section; FIG. 2 shows a patch of contact between the conical tool and the workpiece at this stage; FIG. in figs. 3 and 4, the tool and contact spot, respectively, for the stage of running the disc to the final dimensions.

The tool for the implementation of the proposed method (Fig. 1) consists of a punch with a conical working surface 2, making a rolling motion, and a matrix 3. In the matrix 3, there is a concentric groove relative to its longitudinal axis, in which a ring 4 is inserted the possibility of vertical movement by an amount equal to the height of the original billet 1 relative to the matrix 3, and connected by means of m-pushers 5 to the ejector 6 of the ejector 7. The springs 8 serve to embed the ring 4 after the ejection of the ejector 6 7 in the down position.

The method is carried out as follows.

A billet 1 of circular or square cross section, respectively, with a diameter or diagonal equal to 2ri, is placed in a stamp consisting of two halves: the upper punch with a conical working surface 2 and the lower die 3. The working cavity of the matrix 3 is at the initial moment of rolling (Fig .1) is formed directly by the matrix 3 itself and by the ring 4, which limits the flow of metal in the radial direction during the formation of the central thickening. In the process of deforming the workpiece 1 in the position of the tool corresponding to the formation of a central thickening (Fig. 1), the metal flows into the cavity of the matrix 3 intended for shaping the thickening. At the same time, due to the restriction of metal flow in the radial direction due to the presence of ring 4, the contact area Pk / remains unchanged until the specified ring is completely recessed (Fig. 3). In the process of forming the central thickening, the rolling punch 2 produces a rolling of the workpiece and simultaneously sinks the ring 4, which acts with the tongues 5 on the washer 6j

causes the ejector to lower, squeezing the liquid from its piston (working) cavity (not shown). Upon reaching the metal filling of the cavity under the thickening

the ring 4 is finally retracted by means of m-pushers 5, which lower when the ejector 7 is lowered (supply of fluid to the rod of the ejector).

Punch 2 produces the final expansion of the flange of the workpiece 1 to the required size (fig.Z).

As is known, the required force for deforming the workpiece is determined by two

factors: the area of contact between the tool and the workpiece and the amount of average force on the tool. At the stage of obtaining the final dimensions of the product (Fig. 4), the contact area is greatest.

At the same time, due to a decrease in the thickness of the flange portion of the disk, the specific force on the tool grows, however, due to the formation of a thickening at an earlier stage (Fig. 1 and 2), when the area

the contact is kept constant (Pk - |) and smaller than the FKJ area (Fig. 4), the growth of specific forces at the final stage of punching and their absolute value is smaller, since there is no outflow of metal into the cavity, designed to form a thickening. Thus, it is possible to reduce the required deforming force for the stamped discs due to the time diversity of the peak (maximum) values

specific effort on the tool. This method is especially effective for obtaining products with a complex shape of a central thickening or with its considerable height. In this case, the component

The specific force on the tool, associated with the resistance to flowing of the metal in the central part of the workpiece, reaches a significant value, and the proposed method can achieve a 1.5-2.0 fold decrease in the required deformation force.

Example. Stamping of a disk made of ZOHGSA steel (a blank under the subsequent stretching of a waveguide de-pi) with dimensions: diameter of a flange part 128 mm, thickness 4 mm; diameter of the bulge in the central part 54 mm, thickness 4 mm. Harvesting sheet diameter 2g- | 80 mm, thickness 10mm. Stamping on the press with a force of 160 ton,

angle of inclination of the tool 2e, angular running speed 200 rpm. When using the method obtained the desired size of the product. For comparison: when stamping according to a known scheme, the maximum obtained flange diameter was 92 mm.

Claims (1)

Claim 1. Method for manufacturing discs with central thickening with face rolling of a flat blank, including forming a central thickening on a blank and running on a final size, characterized in that, in order to expand technological capabilities by increasing the maximum sizes of the disks, when forming a central thickening on the blank limit the flow of metal in the radial direction. 2, A tool for the manufacture of discs with a central thickening, containing a matrix with a cavity under the workpiece, obkaty0 five A punch with a longitudinal axis tilted with respect to the matrix and an ejector, characterized in that, in order to expand the technological capabilities by increasing the maximum dimensions of the disks to be made, it is provided with a ring, the matrix is concentrically grooved under the ring the possibility of vertical movement and is connected by means of spring-loaded m grams to the ejector, while the outer diameter of the ring is made equal to the diameter of the cylindrical punch , and internal - to the diameter of the cavity of the matrix  -L y