SU1234031A1 - Die set for forming ribbed forgings - Google Patents

Description

The invention relates to the processing of metals by pressure, in particular to the design of dies for open forging of forgings, i.e., their ribs with flat or incompletely rounded tops (forgings of brackets, connecting rods, gears).

The purpose of the invention is to reduce the consumption of metal, idush, in its bluing, and increase the durability of the stamp.

FIG. 1 shows a preliminary die punch at the final moment of punching, section; in fig. 2 - the final stream of the stamp with the transitional forging installed in it in the initial position, section; in fig. 3 - the same in the final position;

ten

DBH - diameter of a circle inscribed in

the contours of the engravings for the ribs, while the preliminary stream in the area under the tops of the ribs is made along the radius determined from the expression:

f) Nar - Aries

,

where R is the radius of rounding of the part of the preliminary stream in the area under the tops of the ribs.

The burr groove of the final stream is made with a height of / gz.ok exceeding the height of the burr groove of the pre-stream 1.5-2 times in order to reduce the magnitude of the frictional forces during deforming FIG. 4 - transitional geometry (with metal rounding in the final stream, with a flaccid butt) and final (with a flat-Thus, engraving of the final

KIM butt) forgings. The stamp die differs from the engraving of the preliminary stream with the height of the ribs and height

Stamp for forgings with ribs contains a cut groove and a face shape

top 1 and bottom 2 halves. On each, portions of the recesses for receiving the ribs of the bottom of the half of the stamp are made of a preliminary stream (Fig. 1) with an engraving consisting of cavity 3 for forming the ribs, intercostal protrusions 4 and opening.

The stamp for stamping forged ribs works in the following way.

The original billet is deformed in the preliminary punch of the stamp and an inlet creek with an engraving is obtained (Fig. 2). A preliminary forging 6 with ribs 7, a bridge punch of a stamp are made with a height of 8 and a burr 9. Then a transitional

the forging is placed, ayut in the final stamp stream (Fig. 2) and deformed to a given height (Fig. 3). At the same time, the volumes of metal 10 from the top of the ribs 7, the recess of the groove 5 with a height of / hz.pr, and also the windows, the height of the final stream by the value

/ 1 0.08 -0.1 (Onar - Ov „),

where h is the height of the elevation of the pre-stream in each half of the strain-30, in the cavity of the engraving by local draft,

pa; excluding resistance from the side of the plate - the diameter of the circle described by the ponost engravings, as well as in the zone formed by the external contour of the engravings under the ribbed lintel 8, while the final stream runs, the corners of the engraving cavity are filled.

0

DBH - diameter of a circle inscribed in

the contours of the engravings for the ribs, while the preliminary stream in the area under the tops of the ribs is made along a radius determined from the expression:

f) Nar - Aries

,

where R is the radius of rounding of the part of the preliminary stream in the area under the tops of the ribs.

The burr groove of the final stream is made with a height of / gz.ok exceeding the height of the burr groove of the pre-stream 1.5-2 times in order to reduce the amount of friction during deformation of the metal in the final stream. Thus, the final engraving

FIG. 2

About drug - 7

FcezM 7 sec / AED

DHOp-DiH

Claims (1)

STAMP FOR STAMPING FORGING WITH RIBS, containing the upper and lower halves, a platform for upsetting, open preliminary and final streams with burr grooves, characterized in that, in order to save metal by reducing the consumption of metal going into the groove and increase the durability of the stamp by reducing stamping forces, the preliminary stream is made higher than the height of the final stream by fl = w (Dnar - Dbu), where m = g (0.08-0.1); h is the excess height of the preliminary stream in each half of the stamp; D „ap is the diameter of the circle described along the external contour of the engravings under the ribs of the final stream; D int - the diameter of the circle inscribed in the contours of the engravings under the ribs, and the preliminary stream in the area under the tops of the ribs is made according to the radius determined from the expression: /) bun - Dvn where R is the radius of rounding of a part of the preliminary stream in the area under the tops of the ribs, and the height of the burr groove in the final stream exceeds the height of the groove of the preliminary stream by 1.5-2 times. SU ,,,, 1234031 Fig.)