SU1224081A1 - Finless stamping die - Google Patents

Description

I

The invention relates to devices for the processing of metals by pressure and can be used in forging and pressing production to obtain non-loose forgings.

The purpose of the invention is to reduce the complexity of manufacturing and the cost of the stamp.

FIG. 1 shows a stamp for a single punching at the moment the forging begins to deform; Fig. 2 shows the same at the time of completion of the forging deformation; fig.Z - node I in figure 1,

The die for stamping includes the upper plate 1, on which the working insert 2 with the ejector 3 is fixed, the lower plate 4 on which the lower forging insert 6 is movably mounted with the help of the holder 5 and the lower ejector 7 is movably installed in the cavity between the movably mounted insert 6, the ejector 7 and the bottom plate 4 accommodates steel balls 8. The volume of the balls in the cavity is regulated by means of the screw 9 in the insert 6. The ejector 7 is made composite for ease of assembly. The projected engraving area of the movably inserted insert 6 is 2.1 times the projection area of the ejectors 7. The stamp is attached to the lower 11 and to the upper 12 press plates with ejectors 13. Accept denoted: D is the maximum diameter of the forging; d - maximum basting diameter; D - the diameter of the chamber under the balls; d is the diameter of the ejector rod. In the movable insert 6, a cylindrical groove 10 is made with a depth equal to half the diameter of the ball 8.

The stamp works as follows.

The heated billet 14 is laid on the lower ejector 7. Upper plate 12 of the press with the upper plate 1

224081

begins to descend. In this case, the upper forging insert 2 starts forming the forging. At the first moment, the punching force is transmitted through the clamp 14 to the lower ejector 7, and it is lowered all the way into the press plate 11. With this, the punching force is transmitted through the steel balls 8 to the movably mounted insert 6, which rises to the highest position (Fig. 1). Upon further shaping, the contact surface of the workpiece 14 and the stamp engraving increase 15 Beta, and there comes a time when

The pressure forces on the movably mounted insert 6 and the ejector 7 are controlled. With further increase in the contact surface

20 engravings of insert 6 (and this, according to the condition of stamp design, coincides with the complete filling of the working cavity) the force on the engraving of insert 6 exceeds the force on the ejector 7. In

25 in this case, the insert 6 is lowered, the steel balls 8 are moved under the ejector 7, which rises by a certain amount, which depends on the ratio of the projections of the area of the 30s of the insert 6 and the ejector 7, in contact with the steel balls 8. 6 and on the move

3 vveru pusher 7 (figure 2),

the moment of mutual movement of the movable insert 6 and the ejector 7, the balls 8 are moved into the opened groove 10, thereby additionally

40 compensate part of the excess metal forgings 15

After the stamping process is completed, the forging 15 is removed from the stamp. To obtain the next forging the whole

45, the process is repeated.

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Compiled by V. Beschekov Editor L. Pchelinska Tehred I. Popovich Corrector V. But

Order 1868/12 Circulation 655Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Srag.Z

Claims (1)

A stamp for a trouble-free stamping, comprising a top plate with a working insert and an ejector fixed on it, as well as a bottom plate with a hollow working insert movably placed on it, an ejector with a forming part and means for supporting and centering the ejector, characterized in that, in order to reduce the complexity of manufacturing, the bottom plate, the ejector and the hollow working insert are placed with the formation of the cavity, the means for supporting and centering the ejector is made in the form of steel balls placed in the aforementioned of the cavity, while on the inner surface of the insert in the area adjacent to the forming part of the ejector, an annular groove is made with a depth equal to half the diameter of the ball and a height of at least its diameter. fi *] About to 4 QO