SU1333436A2 - Method of forming sheet sections - Google Patents

Abstract

The invention relates to processing. Ke metal pressure, in particular to the manufacture of profiles of complex shapes from sheet blanks. The purpose of the invention is to increase the quality of profiles for 1. The invention relates to the processing of metals by pressure, in particular to the manufacture of profiles of complex shapes from sheet blanks. The aim of the invention is to improve the quality of the profiles by reducing the cracking at the bend points. FIG. Figure 1 shows the profile at the pre-shaping stage; in fig. 2 - profile at the stage of final shaping. Tia of the first stage of the pre-curved and-shaped strip forms a flexible trough-shaped profile with the height of the walls 1 more due to the reduction of cracking in - places of bending. In the first stage, a flexible trough-shaped profile is formed from a pre-bent U-shaped strip with wall heights greater than that required by 1-10% and the dimensions of the shelves and horizontal wall being equal to the given data. In the second stage, the vertical walls of the profile are deposited to the required configuration on the finished profile, applying force to the shelves and vertical walls of the profile while simultaneously clamping all its elements. The method allows to obtain profiles with small relative radii and thickenings of the material in the bending zones, which increases the stiffness of the profiles. 2 Il. with b cl required by 1-10% and the dimensions of shelves 2 and horizontal wall 3 are equal to the given. JC of this time, the stream, in which the bending was carried out, is closed to the profile clamped between the punch and the die along the entire perimeter except for the corners of the stream 0 and 3. In the second stage, under the action of the press slide with the side elements of the die 5, they are moved vertically downwards, and the central elements of the punches 6 and die 7 remain stationary. As a result, a wall profile 1 is deposited, the degree of which varies from 1 to 10% depending on the material. 00 CO 00 O) N)

Description

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The draft of the walls 1 in a closed stream prevents the loss of stability of the shelves 2 and the horizontal wall 3 and thereby eliminates the appearance of alternating load and microcracks on the concave surface in the bend zone. In addition, as a result of plastic deformation of the profile that occurs during the precipitation process, there is an increase in the wall thickness of the 1 profile and metal accumulation in the bend zones (in the corners of and / i). The increase in the vertical gap CG between the punch and the matrix occurs due to the elastic deformation of the matrix, since during the upsetting of the vertical walls, the matrix works completely. Thus, the profile deformation in the cross section in the second stage occurs under all-round compression.

An example. On an experimental stamp from a sheet strip of material D16T 2 mm thick, wide; 121 mm, pre-curved conventional flexible in the I-shaped profile, was first obtained a trough-shaped profile flexible without end face precipitation with the following parameters; the angle of inclination of the walls to the axis of symmetry of the profile; the width of the horizontal wall is 23 mm; profile height 38 „1 mm; wall height 34.1 mm; shelf width 18.15 mm each, total profile width 55.3 mm.

After a vertical force was applied, a profile with a size of 150TC, face and two-sided longitudinal support was obtained; the profile was obtained with the following parameters: the angle of inclination of the side walls: to the axis of symmetry of the profile 90, the width of the horizontal wall is 23 mm; profile height 35 mm; you1333436

honeycomb walls 31 mm; shelf width of 16.5 mm; total profile width 52 mm. The described method allows to obtain a qualitatively one-way trough-shaped profile in two stages in one stream due to its preliminary manufacture of a pre-bent U-shaped 10 strip flexible without an end face sediment and subsequent deformation by a vertical force with the application of efforts of bilateral longitudinal support of the plastic deformation zone.

15 Since the deformation forces are applied to the formed profile, the reduction of the profile angles in the bending zones does not occur, and

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However, no cracks are observed at the bend points. The method allows to obtain a profile with small relative radii and thickenings of the material in the bending zones, which increases the rigidity of the profiles.

Claims (1)

Invention Formula Method of forming sheet profiles according to ed. St. No. 1049138, characterized in that, in order to improve the quality of the profiles by reducing cracking at the bend sites, during preliminary shaping, the profile is formed with the height of the vertical walls larger than that specified on the finished profile, and during the final shaping, the vertical walls of the profile are deposited to the required configuration on the finished profile, putting effort to the sticks and vertical walls of the profile while simultaneously clamping all its elements. However, no cracks are observed at the bend points. The method allows to obtain a profile with small relative radii and thickenings of the material in the bending zones, which increases the rigidity of the profiles. Invention Formula Method of forming sheet profiles according to ed. St. No. 1049138, characterized in that, in order to improve the quality of the profiles by reducing cracking at the bend sites, during preliminary shaping, the profile is formed with the height of the vertical walls larger than that specified on the finished profile, and during the final shaping, the vertical walls of the profile are deposited to the required configuration on the finished profile, putting effort to the sticks and vertical walls of the profile while simultaneously clamping all its elements. 5 d  333436 "SJ) b "Vj Editor 0. Filipova Composer L. Samokhvalov Tehred M. Khodanich Proofreader V. Romanenko Order 751 Circulation 694Subscribe VNISh of the State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab, d. 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101  to