US3494161A - Device for stamping metal blanks - Google Patents

Description

Feb. 10, 1970 A. N. SILICHEV 3,494,161

DEVICE FOR STAMPING METAL BLANKS Filed Jan. 11, 1968 3 Sheets-Sheet 1 Feb. 10, 1970 A. N. SILICHEV 3,494,161

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DEVICE FOR STAMPING METAL BLANKS Filed Jan. 11, 1968 3 Sheets-Sheet 5 United States Patent 3,494,161 DEVICE FOR STAMPING METAL BLANKS Alexandr Nikolaevich Silichev, Uiitsa Myasnikova 4, kv. 11, Leningrad U.S.S.R. Filed Jan. 11, 1968, Ser. No. 697,176 Int. Cl. B21d 22/06, 22/08 U.S. Cl. 72-115 4 Claims ABSTRACT OF THE DISCLOSURE The present invention relates to equipment for the pressure-treatment of metals, and more particularly to devices for stamping metal blanks in hot and cold state.

At the present time, the die forging of such articles as railway car wheels, turbine disks, tracks of heavy endless track drives, gears, etc. is effected on powerful presses, rolling-out machines and hammers.

The main sub-assemblies of stamping presses are as follows: a bed, receiving the stamping force, and a slide piece transmitting the stamping force during its motion along guides secured on the bed; the working tool or die is composed of two halves secured on the bed and slide piece respectively.

To carry out die forging of parts on presses high working forces, are required, due to a simultaneous deformation of the entire body of the blank, which leads to an increase in overall dimensions and weight of the presses, as Well as in their cost.

In contradistinction to presses, the working effort in the rolling-out machines, required for working blanks, is considerably lower; but the technology of working blanks inherent in rolling-out machines necessitates the rotation of the blank and working tool, which considerably complicates the construction of the machines and is conducive to losses of energy for overcoming the friction in the machine working members, while also precluding th working of articles from long blanks. 1

An object of the present invention is to provide a device for stamping metal blanks Which will be of a simple design allowing the stamping to be effected with the application of low working forces, as is the case with the rolling-out machines, and with the same positions of blanks and working tools, as is the case with stamping presses.

In conformity with the above-said and other objects, in a device for stamping metal blanks, provided with a die mounted so that its halves are capable of performing relative axial motion by means of the slide piece, one of the die halves, according to the invention, is secured on a movable link imparting to said die half rotary rocking motion without rotation about its axis, thus effecting the working of the blank by setting up a continuously rotating deformation zone with the simultaneous relative axial motion of the die halves.

It is expedient to provide on one end of the movable link a spherical supporting surface for transmitting stamping forces, while on the other end thereof a mechanism is disposed for imparting rotary rocking motion thereto. It has been found most expedient to accommodate the movable link in the slide piece. The mechanism for effecting the rotary rocking motion may be designed as two 3,494,161 Patented Feb. 10, 1970 "ice lead worms with a common worm wheel provided therebetween, the shank of the movable link being mounted in the worm wheel eccentrically and inclinably with respect to the axial line thereof.

For stamping blanks of any shape, it is expedient that the movable link be provided with a holder articulated to the slide piece, which prevents the turning of the die half during its rotary rocking motion.

To diminish the friction on the shank of the movable link and on the spherical supporting surface, the latter may be provided with symmetrically disposed spherical seats to accommodate thrust connecting rods.

The proposed device for stamping metal blanks is of small overall dimensions and simple design, while the stamping of the blanks is effected by exerting working forces 5 to 10 times smaller than those featured by conventional stamping process. When effecting cold die-forging the service life of the working tools is increased.

Other objects and advantages of the present invention will become more fully apparent from a consideration of the following description of an exemplary embodiment thereof, to be taken in conjunction with the accompanying drawings, in which:

FIG. 1 is an elevation view partly in section view of the device according to the invention;

FIG. 2 is a sectional view of the mechanism for effecting rotary rocking motion according to the invention;

FIG. 3 shows another embodiment of the mechanism according to the invention;

FIG. 4 represents an embodiment of the die halves according to the invention; and

FIG. 5 represents another embodiment of the die halves according to the invention.

The device for stamping metal blanks is arranged on a bed 1 (FIG. 1) or foundation, and is composed of a movable part and a stationary part insuring relative axial motion of halves 2 and 3 of the die.

The stationary part of the device is essentially a base 4 mounted on the bed 1 and provided with vertical guides 5, while the movable part is a slide piece 6 moving along the guides 5.

To effect relative axial motion of the halves 2 and 3 of the die, one of them, for example, the half 2 is secured on the base 4 in the working space between the vertical guides 5, while the other half 3 of the die is mounted on the slide piece 6.

For stamping the blanks, the half 3 of the die is imparted not only with axial movement, but also with a rotary rocking motion without rotation about its axis, which motion is transmitted to it by means of a movable link 7 (FIG. 2) from a mechanism 8 for effecting the rotary rocking motion.

As a result of adding the axial motion to the rotary rocking motion of the half 3 of the die without rotation about its axis, a rotating deformation zone is produced in the blank to be worked, which allows the working (stamping) of blanks to be effected with the application of smaller efforts than those required on stamping presses.

The movable link 7 and mechanism 8 for effecting the rotary rocking motion are disposed in the slide piece 6; the movable link 7 is provided at one of its ends with a spherical supporting surface 9 to which the half 3 of the die is secured, the mechanism 8 for effecting the rotary rocking motion being secured to its other end or shank 10.

The mechanism 8 for effecting the rotary rocking motion is composed of two lead worms 11 and 12 with a common worm wheel 13 therebetween. Mounted eccentrically and inclinably in the gear 13 relative to its axial line aa is a bushing 14 in which the shank 10 of the movable link 7 is secured. This provides for the conversion of the rotation of the leading worms 11 and 12 into the rotary rocking motion of the movable link 7 and the half 3 of the die.

The spherical supporting surface 9 is intended for transmitting the stamping efforts during the motion of the slide piece 6. To diminish the friction on the shank 10 and on the spherical supporting surface 9 the latter is provided with symmetrically disposed spherical seats 15 (FIG. 3) into which thrust connecting rods 16 are inserted.

The provision of the thrust connecting rods 16 and spherical holes 15 in the supporting surface 9- is prerequisite when manufacturing devices of a large size for stamping metal blanks.

To preclude the rotation of the half 3 of the die about its axis during its rotary rocking motion, the movable links 7 is equipped with a holder 17 articulated to the slide piece 6.

Experiments that have been conducted resulted in establishing that the optimal conditions for stamping blanks are provided when the movable link 7 and the bushing 14 accordingly are inclined to the axial line aa of the gear at an angle of about 3. T meet this condition, the working surfaces of the halves 2 and 3 of the die are constructed so as to compensate for the inclination angle of the movable link 7. Thus, for example, the halves 2 and 3 of the die (FIG. 4) compensate for the inclination angle of the movable link 7 by making the working surfaces of both halves of the die with a cone angle equal to 177 for by making the cone angle of die half 3 equal to 174 (FIG. 5) and the cone angle of die half 2 equal to 180.

The displacement of the slide block 6 along the vertical guides 5 and setting up working efforts for the stamping operation are effected by means of a screw drive 18 (FIG. 1). To move the slide piece, other systems of drives may be resorted to, such as hydraulic, hydro-accumulator, crank shaft, etc., the selection of the drive system being determined by the specific tasks of the technology of working and production facilities available.

The stamping of metal blanks in the proposed device is effected in the following manner.

A blank 19 (FIGS. 4 and 5) is placed on the half 2 of the die, whereupon the drive 18 (FIG. 1) for moving the slide piece and the drive 8 of the mechanism (FIG. 2) for effecting the rotary rocking motion are actuated.

The slide piece 6 is lowered, and, when the lead worms 11 and 12 and driven gear 13 are rotating, the movable link 7 with the half 3 of the die secured thereon performs the rotary rocking motion, which, after the half of the die 3 has been brought in contact with the blank 19, and with the simultaneous axial motion, creates in the blank being worked a continuously rotating, concentrated zone of deformation, thereby making it possible to work the blank.

The holder 17 prevents the movable link 7 and, accordingly, the half 3 of the die from any possible turning during the rotary rocking motion which allows the stamping of a blank of any shape to be performed.

On completion of the stamping operation, the drive 8 of the mechanism for effecting the rotary rocking motion is switched off, and the slide piece 6 is brought to its initial position.

When manufacturing a blank of another shape, the halves 2 and 3 of the die are replaced by a die of the corresponding shape, and the stamping process is effected in the manner described hereinabove.

The proposed device for stamping metal blanks, which can be classified as intermediate the rolling-out machines and stamping presses, features both the positive properties of the rolling-out process, which reside in decreasing the working efforts and obtaining a more regular flow of metal, and those of the stamping process, which consist in positioning of the die working tools and the use of the vertical pressure accompanied by a continuous feed.

Owing to the concentrated, continuously rotating deformation zone, set up in the blank by the rotary rocking motion of one of the die halves, the working of the blank is performed at a pressure 5 to 10 times smaller than those required when stamping on presses. The device of the invention is of a simple design and reliable in operation.

What is claimed is:

1. A device for stamping metal blanks, comprising a slide piece; a die, composed of two halves mounted so as to be capable of performing relative axial motion by means of said slide piece; a movable link, to which one of said die halves is secured for transmitting rotary rocking motion thereto without rotation about its axis, thus effecting the working of blanks by establishing a continuously rotating deformation zone with the simultaneous axial motion of said die halves; and a drive for moving said slide piece.

2. A device as claimed in claim 1, wherein the movable link is disposed in the slide piece and is provided on one of its ends with a spherical supporting surface for transmitting the stamping efforts, while on its other end a mechanism for effecting the rotary rocking motion is secured, said mechanism for effecting the rotary rocking motion comprising two leading worms and a common worm wheel provided therebetween, into which a bushing is mounted eccentrically and inclinably relative to its axial line for accommodating the movable link.

3. A device according to claim 2, wherein for stamping blanks of any shape the movable link is provided with a holder articulated to the slide piece.

4. A device according to claim 2, wherein for diminishing the friction on the movable link and on the spherical supporting surface the latter is provided with symmetrically arranged spherical seats for accommodating thrust connecting rods.

References Cited UNITED STATES PATENTS 1,968,296 7/1934 Hiester 72115 2,362,779 11/1944 Stevens 72-115 MILTON S. MEHR, Primary Examiner US. Cl. X.R.

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