SU1247145A1 - Method of forging slabs - Google Patents

Description

The invention relates to the manufacture of free forging forgings such as plates and can be used for the manufacture of prefabricated atomic reactor vessels.

The purpose of the invention is to improve the quality of the plates by increasing the degree of deformation of the axial zone of the blanks due to their alternating transverse bending.

Figures 1-4 show the sequence of the forging of a rectangular billet in cross section in combined die heads; Fig. 5 illustrates the forging of a rectangular section, after drawing the workpiece in flat strikes; Fig. 6 is a diagram of the stress-strain state during forging in combined dies.

The ingot- (after pulling the trunnion and billetting) is drawn into a rectangular rectangular billet 1 with a ratio of width to height in the range of 2.0-3.0. This billet is installed with a larger edge on the mirror of the carved striker 2, which has a notch 0.7-0.9 wide for the width of the billet; 90-135 striker angle. The upper die head 3 is made convex with the width of the working surface of the surface, 2 to 2.5 times smaller than the width of the workpiece. The deformation is carried out by moving the upper striker relative to the lower one to the distance between the mirror of the lower striker and the nearest forming surface of the upper striker, equal to 0.80-0.75 of the height of the workpiece. Then, the workpiece is turned to an angle of 180 ° and deformation is performed in the same strikers by the same amount,. Deformation with reversing is repeated until a predetermined level of accumulated deformation is reached. As a result, the forging has a high quality of forging metal in the axial zone due to the multiple alternating transverse bending of the workpiece. Further, the workpiece may be stretched in flat dies to obtain a forged rectangular cross section of specified dimensions.

Thus, the proposed forging method allows to obtain high quality forgings through intensive study of the metal.

When the ratio of the width of the workpiece to its height is less than 2, only the workpiece is pulled over without its transverse bending, and the structure of the axial zone is not worked out. With respect to more than 3, the axial zone is not sufficiently developed.

ingot in connection with a small thickness of the workpiece relative to the width of the upper striker. If the width of the cutout of the lower striker is less than 0.7 of the width of the workpiece, intense thinning occurs.

the workpiece is not observed, and no bending is observed and the structure of the central zone is not worked out. With the width of the cutout of the lower striker, greater than 0.9 width of the workpiece, forging is impossible due to

instabilities of the workpiece in the cut-out. With the width of the working surface of the upper striker, less than 2 times smaller than the width of the workpiece, intensive introduction of the upper striker into the metal of the workpiece without its bending is carried out. With a width of the working surface of the upper striker, more than 2.5 times the width of the workpiece, there is also no bending.

and takes place through the workpiece. When the upper striker is moved by an amount greater than 0.8 of the height of the billet, there is no sufficiently intense transverse bending of the workpiece during deformation, while there is no elaboration of the axial zone; when the upper striker is moved by a value smaller than 0.75 of the height of the workpiece, an unfavorable scheme is created

stress-strain state, which can lead to damage to the surface layers of the workpiece.

The proposed method was implemented when forging an ingot with a weight of 69 tons, a length of 3280 mm, a maximum diameter of 1700 mm, and a minimum diameter of 1600 mm from steel 3. From the profit, a pin 820 mm in diameter was forged. An ingot was forged on a billet with a diameter of 1600 mm, which was drawn in flat strikes to obtain a workpiece with a width of 1800 mm and a height of 850 SIM. The workpiece was deformed into a cut-out striker with a notch width of 1500 mm and an angle

a cutout 120 by moving the upper striker with a working surface width of 800 mm from the lower one to a position at which the distance between the lower striker mirror and the upper

briskly was 680 mm. Then, the workpiece was turned over to an angle of 180 and deformed in the same way.

3 1247145-4

Kantovka and deformatsto repeated. measures of the cross section of 1800 x three times in the same strikers. Then osus x 750 mm. In standard studies, the workpiece was stretched in plane samples taken from an axial hammer before the slab was obtained from a forging, no defects were found.

Ohh 2

fug. J

FiK. if

Pui 5

Editor A.Oar

Compiled by N. Antipov

Techredo. Gore TV-A Corrector C, Scheckmar

Order 4052/12 Circulation 655Subscription

VNIIPI USSR State Committee

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

Production and printing company, Uzhgorod, st. Project, 4

iput.t

Claims (1)

METHOD FOR FORGING PLATES, in which the workpiece is deformed with a tilting in combined strikers, the lower of which is cut and the upper convex with a width of the working surface, n 2-2.5 times smaller than the width of the workpiece, moving the upper striker relative to the lower to the distance between the mirror the lower die and the forming surface closest to it, the upper die, equal to 0.80-0.75 of the height of the workpiece, which consists in the fact that, in order to improve the quality of the plates by increasing the degree of deformation of the axial zone of the workpieces due to their alternating transverse about bending, the workpiece is drawn by pulling an ingot to obtain a rectangular cross-section with a ratio of width to height in the range of 2.0-3.0, and the workpiece with a tilting 180 is deformed in a notched die with a cut-out width of 0.7-0.9 width blanks. „<. SU „, 1247145