SU1690933A1 - Device for manufacture of plates - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular, to the technology of manufacturing forgings of the type of plates. The purpose of the invention, the saving of metal in the manufacture of a plate with rectangular sides, is achieved by forging the billet to obtain a semi-finished rectangular shape with a width of 0.5, 0.8, the width of the plate. An equal-thickness profile of the U-shape is formed by subsequent pressing. . The angle of inclination of the walls to the base of the semifinished product is 45 ... 75 ° C. After the change of the strikers, the profile is unbendled. The final formation of the plate is carried out by pulling in the longitudinal direction with flat strikers with the degree of deformation 7,., 15%. The result is a plate forging with minimal waste of marginal areas, beat., 1 tabl.,

Description

The invention relates to the processing of metals by pressure, in particular, to the technology of manufacturing forgings of the type of plates with rectangular sides,

The purpose of the invention is to save metal in the manufacture of plates with rectangular sides.

FIG. 1 shows the formation of a notch along the longitudinal axis of the ingot formed by the upper striker; FIG. 2 is a view A of FIG. 1; Fig. 3 shows the final stage of forming a semi-finished product of rectangular cross section; in fig. 4 - formation of a U-shaped profile; in fig. 5 - the initial stage of editing (unbending) the profile; in fig. b - finishing operation for forging the slab.

The method is carried out as follows.

Billet (billet) 1, holding the shank 2, forged along the axis strikers 3 and 4 (Fig. 2). The recess formed by the upper striker is expanded by displacing the lower striker with the workpiece to the left. The upper striker is pressed into the workpiece to obtain a semi-finished product 5 of a rectangular shape (Fig. 3) with the width of the crown.

Subsequent pressings are carried out in such a way as to form an uniformly thick U-shaped profile b (Fig. 4) with a wall thickness and a wall inclination angle to the base of a. After changing the strikers with the upper 7 and lower 8, the striker (Fig. 5) bends the profile by moving the workpiece along the axis. The final formation of the plate is carried out by pulling in the longitudinal direction with flat strikers with a degree of deformation of 7 ... 15%. The resulting plate has a width of Vpl and a thickness of Zpl.

To reveal the intervals of the technological parameters of the method, special studies have been carried out in

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laboratory and industrial conditions. Research data presented in the table. Forging of plates in laboratory conditions was conducted on lead ingots, and in industrial conditions - on ingots of steel 10,

From the data in the table it can be seen that when Vff / Ipl less than 0.5, there is a non-filling of the P-shaped profile, and the profile is different in thickness. At final formation, the plate has a wavy contour, which dramatically increases the waste of metal in the manufacture of parts from forgings.

At Vff / Ipl 0.8, a burr is formed on the shelves of the U-shaped profile, which also leads to the formation of a thin-thickness profile and a wavy contour of the plate.

At a 45 °, the thickening of the shelves takes place during the unbending of the profile, which leads to a different thickness of the molded profile, and during the final formation also leads to a wavy contour of the plate.

At a 75 °, there is a non-filling of the U-shaped profile due to the lateral shift of the upper striker. The different thickness of the profile also results in a wavy contour of the plate.

When the degree of deformation in the longitudinal direction (during final formation) is less than 7%, traces of lateral distillation remain on the final forging, 1 which can lead to final rejection of parts (blackness, cracks, okatin zakovka, etc.).

When the degree of deformation of the broach is more than 15%, a significant mass of metal moves along the forging axis, while the technopsy ability of producing wide plates is reduced.

Example. An ingot weighing 50.0 tons of 12H2MFA steel, after heating to the forging temperature, billetted, forged the trunnion, chopped off the bottom part and the excess trunnion. Then the resulting block was forged in flat strikers into a semi-finished rectangular section: 1300 wide and 790 mm high.

After intermittent / precise heating, the obtained rectangular semi-finished product was forged on a figured plate by the method of transverse pickup with a special narrow forging striker with an angle of inclination of the side faces of 45 ° and a working surface 400 mm wide,

made eccentric in relation to the shank of the striker (eccentricity 150 mm). Transverse distillation was performed using the transverse displacement of the manipulator trunk from the central position.

by an amount of ± 200 mm and a turn of the upper striker by 180 ° around the vertical axis. As a result of the transverse pickup, a U-shaped semi-finished product was obtained in a sheet of a different profile, the walls of which are inclined to

the plane of the base at an angle of 45 °, with dimensions: profile thickness 300 mm; base width inside the profile is 1100 mm; base width outside the profile is 1380 mm; sidewall width 800 mm; profile length 5400 mm.

The obtained U-shaped semi-finished product was unbent on a flat table with a flat striker and stretched longitudinally.

to a thickness of 270 mm, which amounted to a degree of deformation of 10%,

As a result of forging, a plate was obtained with dimensions: thickness 270 mm; width is 2900 mm; length is 5900 mm

The use of this method reduces the metal consumption by reducing the amount of waste at the edge portions of the plate by obtaining it with rectangular sides,

Claims (1)

Invention Formula A method of manufacturing the plates, including heating the ingot, stretching it in the longitudinal and transverse directions to produce a rectangular section blank, forming a semi-finished U-shaped profile and then unbending the walls of the resulting profile, in order to save metal in the manufacture of plates rectangular sides, a rectangular section blank is obtained with a width equal to 0.5 ... 0.8 plate width, the semi-finished U-shaped profile is formed with equal thickness with the angle of inclination of the walls to the base 45 ... 75 °, and after unbending the walls, stretching is carried out in the longitudinal direction with a degree of deformation of 7., 15%, 60 60 60 60 60 44 45 75 76 60 60 60 60 11 Non-filling of II-profile (multi-thickness profile) I1 No comments I1 The same 11 11 Burr on the shelves of the II-shaped profile. Profile of different thicknesses 11 Thickening of the shelves when the profile is bending 11 No comments 11 The same 11 Non-filling of the U-shaped profile due to lateral shear of the upper striker. Different thickness profile 6Speed from lateral acceleration 7No notes 15 the same 16 It does not make sense because of a significant stretch of metal along the forging axis. g 2Z 1 Fil2 FI.3 Fig L N FIG. five Fig.8