SU1430146A1 - Method of stamping metallic blanks - Google Patents

Abstract

The invention relates to oO. iacrii processing meta. 1 time pressure, in particular for methods of punching, and. Can be used. 1iiiiiiaiio iij-; i iii i imponx is detailed with the ras, l, lii, iii, i (, il.,;. 1 НТ1-11СИ ( | 1Natal nro-; (; n: -i; ki e efficiency {) b () ores (I am H11. :: ri piiDBVif) (1gad | un x X i i) -i i40CKifM tool 3 o.:ii; Bpe.; OitH (. With a regular ocri. Oil nodachn zagot (1 wkm I II (c lXMiei ii de (| k) 1l; an 1n; a iiioHKH 1 ocetuisi polacha ...));) OKarbii; aioHier ) nsstr ms I a L.: glad |; h of the workpiece i. (i and. i.

Description

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with about

four;

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Phi. /one

Billet with 1 nom tool of billet 1 with a strument 2 s

The invention relates to the processing of metals by pressure and can be used in the manufacture of metal for the preparation of axisymmetric parts. ; The purpose of the invention is to intensify the process and increase the efficiency of the equipment.

FIG. 1-3 schematically depicts the initial, intermediate and final stages of stamping; in fig. 4-6 are the contact areas of the workpiece and the tool and (there are moments around the contact ends of their contact ends).

set in support-2 (Fig. 1). Osadiva- 1 is produced by supporting ins with an axial force simultaneously with rolling out the conical tool 3, which is constantly rejected from the central axis} ia angle a. The working surface of the rolling tool 3 has the shape of a cone with an apex angle equal to 180 ° -2a, therefore, the upsetting workpiece at the initial stage of punching has the shape of a concave cone, one of which forms parallel to the support tool 2. To ensure constant contact between the deformable workpiece and the whole rolling, with its conical surface of the tool, the draft is carried out with the axial feed of the workpiece t per revolution of the rolling tool at the initial stage of punching with a value larger than R-tg2a. i.e., at the initial stage of punching, tg2a, where R is the radius of the upsetting workpiece, which varies during deformation.

The workpiece 1 is upset to the limiting degrees of deformation of the material (Fig. 2). It acquires a barrel-shaped form; by the end of the intermediate stage, the axial feed rate t is close to R tg2a, that is, tg2a. After this, the axial iodine of the workpiece 1 is reduced relative to the increasing diameter of the workpiece, i.e., tg2a (Fig. 3). In this case, the contact between the end surface of the deformable workpiece and the surface of the rolling conical tool acquires a local character. This stage continues until the height of the workpiece reaches a predetermined value, after which, for example, the press slide, on which the matrix with the workpiece is installed, reaches a rigid stop and begins the smoothing stage (calibration), at which the axial feed rate (not shown) . The angle of deviation of the axis of the rolling tool at all stages of stamping is constant.

A feature of the proposed method is that the axial feed t for each revolution of the rolling tool can be adjusted during the upsetting process, depending on the properties (ductility) of the material, and this control

0

The lining is strictly related to the diameter of the workpiece increasing with the draft. Due to the fact that the end surface of the workpiece is constantly in contact with the entire working surface of the rolling tool, a symmetric torque Mie, Mie is created at the initial and intermediate stages of deformation. from multidirectional forces P, RP., as a reaction to the action of the rolling-in instrument, which leads to the twisting of the workpiece (Fig. 4 and 5). Thus, at the intermediate stage of sludge, a greater degree of deformation is achieved with less required technological effort. In addition, the running movement created by the running tool and the resulting torque occur at all stages of deformation, which increases the efficiency of the equipment used. Having reached its maximum value at the intermediate stage, the torque is maintained at the final stage Mk; (Fig. 6). According to the proposed method, the equipment efficiency is also increased because the contact area, achieved with the limiting degree of deformation at the intermediate stamping stage Sn, is also preserved at the last stage SK, i.e. 5a ± 5k (Figs. 5 and 6).

Example. It is required to obtain a part by punching by rolling a part — an emphasis 77.24.102 from bar 0 28 and steel 40X, which is a mm core and thickening. mm height mm. The punching is carried out on an experienced mountain of a stamping press with the following technological parameters; nominal force 200 tf; angle of running 3 °; the number of swings is 960 / min; speed of axial movement of the press ram, adjustable 32 ... 64 mm / s. The original billet for the formation of flange height mm.

0 The degree of deformation is expressed as the ratio of the size increment to the initial one.

five

0

five

size

the height of the workpiece is coc

 H-k 8th-10. put, 8 /.

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Such a degree of deformation for this steel with half-die forging (750 ° C) by one deformation scheme cannot be achieved. Therefore, we take for the chosen sludge pattern and these deformation conditions the ultimate degree of deformation, 75, i.e., the intermediate height of the workpiece with mm. Proceeding from the equality of the volumes, at this height, we determine the intermediate diameter of the workpiece Dnp 56 mm, i.e. 5 to this height, and the diameter it is necessary to besiege the workpiece with one scheme — punching with permanently in contact with the entire working surface of the rolling tool, and then change localization of the scheme and tampons for rolling around, reaching the degree of deformation of this stage, 5, i.e. from the height of intermediate h (ip 20 mm to the height of the final mm. Based on this task, we determine one axial speed of the tool moving, both baking these conditions, i.e. moving the tool for each run-in up to the intermediate diameter Dnp should pass over the entire conical contact surface. When tilted by 3 ° a conical tool having an angle of 174 ° to one side, the opposite side deviates by 6 The intermediate radius Rnp is 28 mm and, if we consider the resulting right triangle, the leg opposite to the angle 6 ° is precisely the axial movement of the tool that ensures the specified conditions: 1051 tg6 °; 3 mm; the number of tool swings by - | 1b / s From this, we determine the required axial velocity, the movement of the tool VQ. sixteen

48 mm / s and sets this speed on the rolling press, thereby providing a draft with a degree of deformation, 87 with two different loading schemes.

The use of the invention allows to intensify the process of deformation of the workpiece and increase the efficiency of the equipment.

Claims (1)

Invention Formula The way shtampovki metal blanks by face precipitation blanks conical tool and its subsequent rolling with the same tool, characterized in that, in order to intensify the process and increase the equipment efficiency, the end draft is carried out simultaneously with the rolling of a conical tool, whose axis is deflected thickness relative to the punching axis; in this case, to the maximum degree of material deformation, the axial feed of the workpiece is Tg2a, and after that - t Rtg2a, where R is the current radius of the workpiece. (rig. 1 FIG. 6