SU1202682A1 - Die for closed stamping - Google Patents

Description

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The invention relates to the processing of metals by pressure, in particular, to the structures of closed dies.

The aim of the invention is to reduce the energy consumption of the process.

Fig. 1 schematically shows a stamp, a general view from the left - at the initial moment of deformation, to the right - with the lowest position of the punch; FIG. 2 is a section A-A in FIG. one

The closed stamp comprises a housing, an installation sleeve 2, between which the side part 3 of the matrix is located, inside which there is an internal part 4 of the matrix, resting on the base plate 6 spring-loaded with elastic elements 5 and resting on the base 7. fastened to housing i with bolts 8, a punch 9 and a pusher 10,

The stamp works as follows.

The workpiece is placed on the lower part of the matrix 4 and they begin to deform by the punch 9. At the same time, the lower part of the matrix under the action of forces: and, applied to the workpiece, goes down along with the base plate 6, compressing the elastic elements 5j on which the base plate 6 rests

When the press reaches a force of 0.1-0.15 on the slide of the workpiece, on which elastic elements are designed, the support plate 6 abuts against the base 7, and further deformation of the workpiece takes place on the fixed lower part 4 of the die.

At this time, the lower part 4 of the matrix drops below the lower edge of the side part 3 of the matrix by an amount equal to (0.02 - 0.025) 1 / Rn.h.m. where РНчм surface area of the lower part of the matrix from the side of the engraving. . The side part 3 of the matrix is provided with two protrusions and is fixed in the housing stationary, each of which covers the lower part of the matrix on the outer surface during the entire working stroke in sections equal to the arc length, limited by an angle within 15, the vertical axis of the stamp, perpendicular rnu to her.

When the workpiece is deformed, the metal fills the stamp engraving, and the excess metal, obtained due to the inaccuracy of the cutting of the workpiece, is displaced 10

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| Hutz in compensators formed when lowering the lower part of the matrix between the lateral 3 and lower 4 parts of it. Burrs are formed in the form of 5 two half-rings, separated from each other by protrusions.

When the e of the punch 9 moves upwards, the compression force of the springs 5 transmitted through the base plate 6 and the lower part 4 of the matrix to the burr provides (its cutting between the lower edge of the lateral part 3 of the matrix and the upper edge of the lower part of the matrix. Separated from the forging, two half-burrs fall on the upper plane of the support plate 6, from where they are removed through a longitudinal groove made together in the housing 1 and the installation sleeve 2. The forging is expelled from the die after trimming the burr, when the press ejector transmits the pushing force on the pusher 10. In the lowest position of the lower part of the matrix, a compressive force of elastic elements constituting 0.1 to 0.15 of the stamping force provides, during the course of punch i, upward cutting of the burr between the lower and side portions of the matrix due to the compressive strength of elastic elements .

The angle of coverage of the lower part of the matrix protrusions at 15-20 ° ensures reliable placement of the lower part of the matrix and the side of the matrix during the process.

A further increase in the angle of coverage is impractical, since this entails a reduction in the area of the gap through which excess metal flows into the burr, an increase in the specific pressures acting on the lateral part of the matrix, and therefore reduces the tool life.

The height of the compensation slit, equal to (0.02 - 0.025) / H.c. ", ensures the removal of surplus metal obtained due to the inaccuracy of cutting blanks without significantly increasing the required punching force.

A further increase in the height of the compensation gap leads to too intense leakage of the deformable metal from the die cavity and failure to fill the corners of the die with metal.

Compression forces of the springs in the lowest position of the lower part of the matrix, amounting to 0.1 g 0.15

312026824

The punching force needed to compress the springs is not advisable, so ensuring the cutting of the burr between as this leads to additional lateral and internal parts of the matrix increases the required ax. Further increase in the effort of the stamping process.

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FIG. 2

Claims (1)

A CLAMP FOR A CLOSED STAMP, comprising a housing, a mounting sleeve, a punch, a base plate with a composite matrix installed on it with a compensator, elastic elements, a base, characterized in that, in order to reduce energy consumption, one of the parts of the matrix is made with ring protrusions on the other side part of the matrix, fixed in the housing and installed concentrically to it, covering it along the annular section with a length equal to the length of the arc, limited by an angle of 15-20 ^σ to the vertical axis of the stamp, in a plane perpendicular to it, another hour Part of the matrix is installed with the possibility of reciprocating movement, while parts of the matrix form two compensation slits with a height determined from the expression ____ N = Il · (| Hz.h.m. where H is the height of the compensation gap mm; hi = 6 (0.02; 0.25); S Fh h n “the area in terms of the surface of the lower part of the matrix from the side of the engraving, mm, while the compressive force of the elastic elements in the lower position of the lower part of the matrix is 0.1 0.15 the magnitude of the stamping force. SU „1202682