SU1268265A1 - Method of producing billets for forge cut-off block heads - Google Patents

Abstract

The invention relates to a process for the manufacture of forged die heads. To increase the durability of the dies, by eliminating defects in the area of their working surface in the original blank plate, the hole is performed by a LEON with a radius smaller than the radius of the die head, the annular area around the edge of the stitched hole is thickened and distributed. The duration of the cooling is chosen as a function of the thermophysical properties, the heating temperature and the thickness of the blank plate. The cooled ring rigid, its zones provide for the distribution of forging defects of the workpiece. 7 il.

Description

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O) SL The invention relates to a process for the manufacture of a tool for forging lashes. The purpose of the invention is to ensure the stability of the strikers by eliminating metal defects in the area of their working surface. Figure 1 shows forged. a plate with a pierced hole, in Fig. 2 a plate with heat-conducting rings (on the left in the initial position before distribution, on the right after the distribution of the holes) j in Fig. 3, view A in Fig. 2; Fig. 4 shows the lines of the rub on the plate; Fig. 5 shows the preparation of the cut-out striker after chopping; in Fig. 6, a variant of making the striker with a deep cut, pierce the oval, insert the plate after the distribution of the hole with the marked ruby lines in Fig. 7 - preparation of the striker is ready after felling. The method for manufacturing blanks for cutouts of cuttings includes heating, forging the plate, cutting, and ivmsHHe of the die-cut profile. Before cutting, the plate is pierced to obtain an orifice with a radius Оe750, 85 of the radius of the notch of the striker, around the stitched hole, the annular zone with an at least 2.5 i internal diameter 1.6-2.2 of the diameter of the pierced aperture is heated, and after pressing the hole is expanded to forging sizes, the duration of heat removal (pressing) is chosen according to 1-1 200 MH o + pg 2) ± (1 + 20 duration from} this T is the surface temperature of the heated plate, C, HO height of the plate , m, and Cj j heat capacity of materials, respectively heat sink ring and plate, (10) thermal conductivity of materials Respectively heat sink ring and plates, W / mk (V, and thermal diffusivity of materials, respectively, heat of the discharge ring and plates, (+) sign at C - L, -a,: sign () with GJ. L .j ";, The method of manufacturing blanks for forged die heads is carried out as follows. From the initial ingot temperature heated to forging temperature (after forging the trunnion, billetting, cutting 5 siege waste) plates 1 wide, length d L, a height HO, and after heating in an oven (if required) is sewn plate hole 2 n diameter D, equal to twice the radius of notch 0.75-0.85 striker Rj (Figure 1). The stitched plate is mounted on the ring 3, the ring 4 is symmetrically placed on the top of the hole 2, ring 4 is carried out by pressing the annular zone of the surface layers of the metal of the plate 1 (to a depth h) with the outer diameter of 1) equal to (2.5-3.5) 1) and internal diameter Dg (1.6-2.2) x X GC, Charge time, i.e. the duration of the contact of the plate with rings 3 and 4 is determined by the dependence shown. After pressing, the hole 2 is punched out by the punch 5, producing a hole 6 in a plate with a diameter of D 2 cm (Figures 2 and 3). Then, the cutting of the plate is carried out at 1 point to lipia 7, two blanks 8 are obtained, in which the striker is angled J (Lig. 4) by cutting (along line 9). As a result, a blank is obtained: a zigrezny striker with a radius of the notch R, a width of the notch В§ and gluN5 (figure 5). When it is necessary to cut the billet with a deep cut I use one of the following when flashing: oval shape (fig. 6). In this case, the heat sink rings 3 and 4 are oval and the hole is distributed to D 2 K with an oval punch. After cutting along lines 7 and 9 (Fig. 6), a cut-out die is prepared with parameters RJ, Bg, {J (Fig. 7). Subsequent fabrication of the striker is reduced to heat treatment, machining of the dovetail guides (not shown) and rounding radii of the striker die, while also finishing the machining of the cutout and metalworking. PRI and, mer. An ingot with a mass of 9.0 tons is heated in a furnace, the trunnion is rolled, billetted and set down, as a result, the block is reached VYSS1TOY 650 mm, with a diameter of 1330 mm, Posl. two heating

in a furnace from an upset unit, a billet with a height of Nd 450 mm, width B 1660 mm is forged, the waste is cut from the profitable and bottom parts of the ingot to obtain a plate with a length L of 1250 mm. After heating, a central hole with a diameter of 400 mm is stitched in the plate, placed on the heat-removing ring, a heat-removing ring is also installed on the top of the plate and the annular zone of the plate is intensified, using rings of steel 20 with an outer diameter of P 850 mm and inner diameter 550 mm, height 400 mm. Podstuzhivan time 35.4 minutes After pressing with a punch with a diameter of 500 mm, the hole is dispensed. After that, the heatsink of the ring is removed, the plate is cut into two parts along the size of 1250 mm, and the die is cut at an angle of 110 by tangential to the hole in the plate. The result is two blanks

forged cutting dies with geometrical parameters: B 1660 mm, Lj 600 MMi Н 450 mm, N 220 mm, Bj 940 mm, R. 250 mm, T 110. After annealing, the workpiece is subjected

heat treatment (quenching and tempering), and then machining is done by the dovetail, the radius of curvature of the striker's die, and by finishing and metalwork, the

irregularities on the surfaces corresponding to the notch of the striker. . .

Comparative data resistance. jigs produced by the proposed and known methods are given

in the table.

Claims (1)

According to this table, the durability of the strikers up to the first regrinding, manufactured by the proposed method, increases by 1.95-2.29 times in comparison with the strikers manufactured in a known manner. Claims The method of manufacturing blacksmith die blanks, including heating, forging the plate, cutting and shaping the cutout profile of the heads, characterized in that5 with the aim of improving the durability of the heads by eliminating metal defects in their working surface, the plate is pierced before cutting; openings with a radius of 0.750, 85 of the radius of the cutout of the striker, around the stitched hole, the annular zone is intensified with an outer diameter of at least 2.5 and an internal diameter of 1.6-2.2 of the diameter of the stitched hole After the pressing, the hole is expanded to forging sizes, the duration of the pressing being chosen according to - II 1 20d) () I 20 - J: P +. .), Cj where T is the duration of churning, min; T is the surface temperature of the heated plate, C; Nz- plate height, m; and Cj is the heat capacity of the materials, respectively, of the heat sink ring and the 10 J plate / / kg-K; .) ji, is the thermal conductivity of materials, respectively, t of the floating ring and plate, W / m-K, (and thermal diffusivity of materials, respectively, of the heat conducting ring and plate, 10 m2 / s. sign (+) at C. Д, -о (, C2; -J jc 2 sign (-) at С. |, -Сх С (2. Fi .. 1 Fig.Z § W Le 5 FIG. 6