SU1608008A1 - Method of producing blanks of disks - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the production method on forging presses blanks of the type of discs with a diameter of up to 2000 mm, intended for cutting out the initial blanks from them for stamping the bottoms. The purpose of the invention is to reduce the consumption of metal by bringing the shape of the forging to the shape of the product. The goal is achieved in that a block is obtained from the ingot after rolling in the trunnion, billetting and removal of the bottom part. At the block length, gaps with a depth of 0.2 ... 0.35 and a width of 0.15 ... 0.3 diameters of the block with a pinch angle of 10 ... 60 ° are performed at intervals. A 180 ° turn-off is performed and the same dimensions are re-clamped at the same distances. After that, the block is turned over by 90 ° and in the area of the workpiece in the place of clamping with a length of 1.2 ... 3.0, the width of the clamping is drawn with a relative feed of 0.4 ... 0.6 relative feed in the remaining sections block. The recommended drawing pattern contributes to the approximation of the shape of the forging to the shape of the product and, ultimately, the reduction of metal consumption by reducing waste during cutting. 3 ill., 1 tab.

Description

The invention relates to the processing of metals by pressure and can be used in the manufacture of forging presses blanks of the type of discs with a diameter of up to 2000 mm, designed dp cutting from them the original blanks for stamping the bottoms.

The purpose of the invention is to reduce the consumption of metal by bringing the shape of the forging to the shape of the product.

Figure 1 shows a circular ingot with clamps made in it from two diametrically opposite sides that are in the same plane; figure 2 - then

top view; Fig. 3 shows a block extended to its final dimensions. The method is carried out as follows.

In the ingot 1, which is pressed onto a circle with a diameter D, the clamps 2 of depth h and width b with the angle of taper of clamp 2 are diametrically opposed (figure 1). After that, the block is drawn by crimping in the direction perpendicular to the pinching direction (Fig. 2), while in section 3, billets with a width B in the pinch position are drawn with relative O

about

00

00

No less than hell (ag / a О, 4-0 „6) on the other sites. After drawing, a semi-finished product A (with waste 5) is obtained, from which, after cutting, blanks 6 are cut out for subsequent stamping of the bottoms

(fig.Z).

It was established experimentally that the method can be successfully implemented if h (0.2-0.35) D, b (0.15-0.30) D, OiU-B, B (1.2-2.0) b and aft (0.40, 6) hell.

At h = 0.2D, the pinch depth does not have a practical effect on the ovalization of the edge portions of the workpiece and the metal consumption rate is 1.41-1.43 (table example 1). At, 35 ovalization is also not observed due to the small size of the jumper (), the workpiece bends in the overcrowding zone, the drawing process becomes unstable (example 4

tables).

At b.0.15D, the ovalization of marginal areas is insignificant, the consumption rate is 1.37-1.4 (example 5 of the table). When 3D occurs, metal is intensively weathered in the overcrowded zones, as a result, the consumption rate is also too high (Table 8, example).

For CX .: 10 °, the ovalization of marginal areas is insignificant, the consumption rate is 1.4ri, 41 (table example 9). For COO 60 ° a significant weighting of the metal occurs in the pinch zones, as a result, the consumption rate is 1.39-1.43 (example 12 of the table).

At 2 b, the ovalization of the marginal areas of the preform is also insignificant, the metal consumption rate is 1.35-1.39 (table example 13). At, 0 b, the metal consumption rate is 1.37-1.39 because of the small amount of ovization of the marginal areas of the workpiece (Table 16, example).

At aH-, 0.4 hell there is an uneven amount of ovalization in two mutually perpendicular directions (along the length and width of the plate), which is accompanied by a higher metal consumption rate in the range of 1.27-1.31 (table example 17) . When ag is 0.6al, due to the unevenness of ovalization along the length and width of the plate, an increased rate of metal consumption is also observed with cutting 1.26-1.3 (table examples 20, 21).

At the optimum value of the relative feed, the shape of the forging in the plan approaches the circle, thereby ensuring the lowest metal consumption rate for the subsequent cutting of the workpiece with a diameter of Dj. Stretching round billet onto the plate with pinchings made from two diametrically opposite sides helps to increase the broadening by 1.15-1.3 times, i.e. the plate width can be increased by 15-30% compared with the conventional forging scheme. This makes it possible to exclude the draft operation during the manufacture of some standard sizes of plate forgings, which drastically reduces the labor intensity of forgings.

Example. A block with a diameter of D 870 mm and a length of mm is obtained from an ingot with a mass of 6.8 tons (steel 20XMA) after rolling in the trunnion, billeting and removing the bottom part. At a length of the block, at intervals of 210 mm (counting from the bottom end of the ingot), three clamps with a depth of h of 220 mm, a width of mm with a taper angle of 26 ° were performed, the block was turned 180 ° and repeated clamps of the same dimensions were performed again . After that, the block is turned 90 °, made flat by strikers up to a plate height of 120 mm with feeds from 200 (in the initial stage of stretching) to 350 mm (in the final stage of stretching), while in areas of the block in places of pressure the length mm (at the initial stage) and the length mm (at the final stage) are drawn with the feed from mm to mm. As a result, three oval forgings are paired together - a semi-finished product with a plan diameter of / v1350 mm (120 mm thick). After that, cutting is made at the pinch points and subsequent cutting of the disco with a diameter of 1240 mm (metal consumption rate at cutting is 1.27).

The results of examples of specific implementation of the method for optimal boundary and foreign values of the parameters are given in the table.

Claims (1)

Invention Formula The method of obtaining disc blanks mainly for the manufacture of bottoms, including billet casting forging the slab block onto a plate, chopping the plate on semi-finished products and subsequent cutting out of the semi-finished products of disk blanks, characterized in that, in order to reduce metal consumption by approximating the shape of the forging to the shape of the product, before forging the block is pressed in one plane from two diametrically opposite parties 160 80086 a depth of 0.2-0.35 and a width of 0.15-0.3 of the diameter of the block with a pinch angle of 10-60 °, and forging is performed by crimping in the direction perpendicular to the pinching direction; length, early 1.2-2.0 clamping width, stretched lead with a relative feed equal to 0.4-0.6 relative feed in the remaining parts of the block. ten W2. / FIG. 2 Fig.d