SU1433617A1 - Method of producing articles having central cavity and tool for effecting same - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the manufacture of products with a central cavity by forging with rolling. The goal is to improve the quality and reduce the labor intensity of manufacturing products. The workpiece 1 is installed in the matrix 2 and rolled around with a punch (P) 4. Simultaneously with the mechanical upset running in opposite to the action of the P 4, the side is first opened and then the piercing is closed with piercing C 3. The P 4 is made with a central compensation cavity the volume of the metal from all deviations of the dimensions of the workpiece 1. The compensating formed after stamping, the protrusion on the product is removed during subsequent machining. 2 sec. and 1 z.p. f-ly, 5 ill. G. e 4 OO 00 O5

Description

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The invention relates to the processing of metals by pressure, in particular to the manufacture of products with a central cavity by stamping by rolling.

The purpose of the invention is to improve the quality and reduce labor intensity.

FIG. 1 shows the initial punching stage; in fig. 2 - stamping without firmware; in fig. 3 - joint stamping by rolling and flashing, the final stage; in fig. 4 - ejection of forgings from the matrix; in fig. 5 - butt trimming and removal of compensating protrusion.

The method of making a product with a central cavity is carried out as follows.

The workpiece 1 (Fig. 1), installed in the matrix 2 with piercing punch 3, is fed to the punch 4 of the running-in and set down in this way. The progress of the piercing punch 3 could flash the central cavity ahead of the settlement of the die 2 to the final height of the forging. At the same time, the speed of movement of the piercing punch 3 to the height of the forging must be higher than the speed of movement of the matrix 2 in the section Lpr-hn, where fcip is the preliminary height of the forging; hit final height of forging. The final stage of joint deformation of the workpiece 1 is running around 4 and progive 3 I punches under the appropriate speed conditions, where Vg is the speed: axial displacement of the punch 3; Y „is the speed of axial displacement of the matrix 2, shown in FIG. 3

; In order to guarantee a non-i-circumferential peripheral surface at the forging i, the piercing punch 3 finishes the working stroke after reaching the punch 4: the height dimension of the forging.

: The removal of forgings 1 is carried out in two; stage. First, the forgings are pushed out of the matrix 2 by the piercing plug-in: 3 when they are returned to their original position: the position at the difference of the working stroke of the matrix 2 and the pushing stroke, then the piercing punch 3 is stopped at this value, which continues to return to the original position of the matrix 2 and removal of the forging 1, for example, with a fork-like removable, com. (not shown). After removal, the forging is fed to the metal machining. From the metal required for the technological process. In this case, for example, trimming the butt on the cutting machine 5 at the forging is combined with removing the seam allowance and press residue 6 with the cutter 7. When the cutter 7 goes to the central cavity of the product 1 (Fig. 5), the press residue disappears, since this cavity exceeds the trim level.

The tool for the manufacture of products by the proposed method, in particular junction 4, is made with a compensation cavity in the form of a spherical recess with

the diameter at the base d is not less than the diameter of the central cavity of the product d and the dimensions ensure that the total volume of the metal is accommodated from all the total deviations of the dimensions of the workpiece.

At the points of transition from the recess and the rolling-in working plane of the punch 4, radius rounds are made to provide less resistance to the output me. talla.

The possibility of obtaining a product with a cen tral cavity without using traditional cutting equipment significantly reduces the labor intensity of its manufacture, there is no need to have such equipment and, accordingly, production areas and vehicles for

0 filing and removal of both forgings and waste (press residues and burrs). Due to the fact that there is no bubble on the outer diameter, since the excess metal is in the compensation cavity, the quality of the forging obtained by the proposed method is higher than the quality of the forging obtained by the traditional method.

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Claims (3)

1. A method of manufacturing a product with a central cavity, including crimping the workpiece with a punch, which is reported to be driven in motion, and flashing the central cavity in it from the side opposite to the application of the crimping force, characterized in that, in order to improve quality and productivity, when crimping the workpiece from the side of the rolling side, a central compensating protrusion is formed, and the central cavity is first opened and then closed to a depth greater than the height of the finished product by the amount of machining allowance, and the compensation protrusion is removed during subsequent machining. 2. The method according to claim 1, characterized in that, with an intensive increase in the force with the closed patching, the forces applied to the product are removed. 3. A tool for making products with a central cavity containing a coaxially arranged matrix, a running punch and a piercing punch, is distinguished by the fact that the running punch is made with a central cavity in the form of a spherical recess with a diameter at the base exceeding the diameter of the piercing punch with a volume not exceeding 20% of the volume of the working cavity of the matrix. fie. /