SU1532171A1 - Ring-type blank for die forging - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to the production of stampless inclinations of ring forgings. The purpose of the invention is to save metal by eliminating excess allowances on forgings. The ring blank for die forging has an outer side surface rotated about the axis of the workpiece at an angle equal to the angle of the stamping bias. Ring stock has a turn of its end surfaces at a different angle. The angle of rotation of the surface of the smaller end is 0.4 ... 0.9 of the angle of rotation of the upper end, and the inner side surface is rotated at an angle not exceeding the angle of rotation of the outer surface. In this case, the cross section of the forging becomes rectangular. 2 Il.

Description

The invention relates to the processing of metals by pressure and can be used to obtain ring forgings without stamped inclinations.

The purpose of the invention is to save metal by eliminating excess overlaps on forgings with dimension ratios

DH-DU ,, / g p s -y- 1 (with i = 0.5) 2hDH

and 0.25 (at 5i i 0.5) (1)

andUH

where D and and 6 are respectively the outer and inner diameters of the forging, h is the height of the forging.

1 shows the cross-section of the workpiece before crimping (editing it in the die) i in FIG. 2 - the same, the section at the initial and final moments of crimping.

The abed cross-section of the stamped workpiece after trimming the burr and stitching the jumper (Fig. 1) is an irregular quadrilateral, whose side ad is rotated relative to the axis of the workpiece by the amount of stamping bias, and the side side b is at an angle t that does not exceed the angle rotation of the outer surface ci, and the end conical surfaces ab and cd are located relative to the plane perpendicular to the axis of the spacing

WITH

iNd

cooking at different angles and and cG, with the angle of inclination of the lower end surface of cG being 0.4-0.9 of the angle of inclination of the upper end surface.

The angle of the blank when stamping is made equal to

(-1-0,014-3,408 - 3,28 5 + n

+ 0.548s (-2.4 - + - (15.36 - 1.632 ° (-t- 12.8; -) |,

(2)

where h is the height of the free (uncompressed in the matrix) part

forgings (figs 1 and 2).

The corner of the top end of the work piece / s is made equal to

(304-10.72 + 2.72

- 0.024 ° (-15.3 - 0.832 +

DH

+ 33.6

-Jl

(3)

and the angle of the bottom end is equal to

 - | 4,630-3,759 - 2,

728

DU

- 3.14 - 0.152 s (+ 11.712

5 - 0.406 -.

D

ABOUT,

(four)

The values of the angles, "and y defined by expressions (2) - (4), ensure the vertical position of the lateral and horizontal position of the end surfaces of the forging of the lower one after crimping (Fig. 2).

Vfazhenie (2), (3), (4) found experimentally.

The stamped billet 1 (Fig. 2), after trimming and stitching, is installed in a crimping die 2, wherein the smaller end of the workpiece protrudes from the matrix by an amount h of 0.2-0.5 of the height of the forging h. II

The workpiece is deformed by pushing the workpiece through the die 2 by the punch 3. B

five

0

five

0

35

40

45

50 55

During the deformation process, the upper part of the workpiece is crimped in the die, and the lower part is stretched out of contact with the die. The rotation of the section of the workpiece and the plastic shear of the metal layers occur. Since the angles of the workpiece are determined with regard to the change in the shape of the section, as a result, the cross section of the forging becomes rectangular, its lateral surfaces take a vertical position, and the end faces become horizontal. Thus, the forging is obtained without excessive firing

PRI m e RO In accordance with the drawing, the forging The ring has the dimensions: outer diameter D 130 mm, inner diameter D 58 mm, height h 56 mm. Size ratio

forgings is 0.43, -

 n 0.45.

A conical ring billet is stamped with the angles of rotation of the surfaces assigned by the expressions (2), (3), (4). The punching is performed on a hammer with a mass of falling parts 3.15 from a solid cylindrical billet 0 80 132 132 o The billet material is steel 12HNZA.

The angle c is equal to 7, h is taken equal to 0.4 h.

In accordance with the expression (3), the angle /} is formed equal to p + | 3,304-10,72-0,43i-2,720,45-0,024 "to 7-15,3-0,4 + 0.832.0,43-7-33 , 6-0.43 "xO ,, 9 ° 9

In accordance with the expression (4), the angle cG is formed equal to сГ 9- -l4,680-3, 759-0.43-2.728-0.45-3.14 "0.4-0.152-7 + 11.7120, 430.45-t-0.406 ““ 0,

In accordance with the expression (2), the angle is equal to | - 7- | -0.014- -3.408-0.43-3.28 0.45 + 0.548-7-2.4 "" 0.4 + 0.43 ( 15.36 0.45-1.632 7 + 12.8 "0.4), -7

The stamped billet after trimming flashing and piercing the hole in the press with a force of 3150 kN is installed in the crimping die. The laid billet stands for calibrating the juice of the matrix by the value of h 0.4, 4 mm. Punch push the workpiece through the matrix and tease forgings required for drawing dimensions with vertical walls and horizontal ends, i.e. without excess allowances.

The metal saving is 1.0 kg per piece.

Claims (1)

Invention Formula An annular billet for volume} of the first punching, the outer side surface of which is located relative to the axis of the billet at an angle equal to the angle of the punching gradient of the punching tool, the taper surface of the upper end face is angled with 0 to the axis of the workpiece, exceeding the angle of the outer side surface no more than 2.5 times, it is expected that, in order to save metal by eliminating excessive overlaps, the conical surface of the lower end of the workpiece is at an angle constituting 0.4-0.9 angle of the surface of the upper end of the workpiece, and the inner side surface of the workpiece is located relative to the axis of the workpiece at an angle not exceeding the angle of the outer side surface. Phi2.1 FIG. 2