SU1199384A1 - Method of shaping rims for wheels - Google Patents

Abstract

A method of profiling rims for wheels, which involves forming a rim with a bottom and curvings adjacent to the bottom by moving the metal in a radial direction relative to the rim axis, characterized by that. mj, which, in order to improve the quality by reducing the metal thinning in the places of curvings, technological corrugations are performed in the areas adjacent to the rounded bottom of the stream, the metal moving in the radial direction during the formation of technological corrugations is carried out to the center of the rim , moreover, the corrugation height is chosen equal to no more than half the depth of the stream of the finished rim, and the inner surface of the rim in the places of rounding does not shape the stream not less than the thickness of the sheet relative to the bottom the original billet. (/) With V ..

Description

The invention relates to the processing of metals by pressure, in particular to the manufacture of rims for wheels.

The aim of the invention is to improve the quality by reducing the metal thinning in the places of rounding between the bottom of the stream and the walls.

FIG. 1 shows the profiles of the rim section on the last three transitions; in fig. 2 - preparation of the rim; Fig. 3 shows a profile of a pre-shaped preform with a partially formed bottom and roundings; FIG. 4 shows a profile file with formed technological corrugations in the zones of the stream bottom adjacent to the roundings; in fig. 5 final rim profile,

The central stream 1 is formed simultaneously with the formation of technological corrugations 2 with a bulge directed from the center of the shell by moving radially to the center of the shell of zones 3 adjacent to these corrugations in places A of future roundings and the middle of stream 5. The formation of technological corrugations is carried out so that their vertices do not change their position relative to the center of the shell.

The height h of the corrugation 2 is assigned not more than half the depth of the brook 7 of the final profile (h y), and the corner zones 4 of the depths do not form to the bottom of the brook 1 by an amount not less than the thickness S of the original piece (). This allows the formation of a surplus of metal in the vicinity of the 4 curvature zones, and in subsequent transitions, this surplus is moved to the corners of the curvatures themselves and, due to this, to avoid thinning of the metal in the said curvatures.

In addition, due to this, it is possible to eliminate alternating deformations in the radial direction, since the metal moves only to the center of the shell.

The implementation of corrugations 2 not exceeding half the depth of the brook 7 of the final profile allows one to achieve the greatest effect of increasing the thickness of the metal in places 4. rounding when straightening the corrugations 2 in subsequent transitions and at the same time eliminate the formation of longitudinal corrugations at the end of the engineering corrugations 2

1993842

The arrangement of the corrugations 2 in zones 3 adjacent to zones 4, simultaneously with the non-forming of zones 4 to the bottom of stream 1 not less than the thickness of the original J preform favors the preferential movement of the metal towards the zones. This is also facilitated by the location of the resultant forces during the rectification of technological fO corrugation 2 with a slope in the direction of the axis of the stream 1.

This method of rim profiling for 4.5 E-16 wheels from 08 kp steel with a thickness of J5 3.5 mm was tested. During profiling, technological corrugations 2 with reverse convexity were made by moving radially to the shell center of zones 3 adjacent to zones 20 4 of radius transitions and the middle of stream 5 without moving the corrugation of corrugations 6 in this direction. In subsequent transitions, the corrugations were leveled until a horizontal stream was obtained. 25 The height of the corrugations 2 varied between 0.1--0.7, the depth of the brook 7 of the final profile, and the height of the undeformed zones 4 radius transitions relative to the bottom of the brook ranged from 0 to 4 thicknesses of the original billet.

At the same time, from the height of technological corrugations 2 from 0.1 to 0.7 of the depth of the brook .7 of the final profile, the thinning in zones of 4 roundings decreased from 0.7 to 0624 mm. However, when the corrugation height was more than 0.5 depth, the brook 7 of the final profile after the corrugation of these corrugations 2 formed relative to the bottom of the brook 1 from 0 to 4 the thickness of the original billet, and at a constant depth of technological corrugations 2, thinning in zones 4 of rounding decreased from 0.7 up to 0.34 mm.

As a comparison with the proposed method, control profiling was carried out in the following ways:

with a bend in the center of the stream, made distribution;

with technological corrugations in areas adjacent to radius transitions made by distribution (alternating deformation during straightening);

with technological corrugations in the zones of radius transitions.

The test results are presented in the table.

Initial thickness

blanks, mm

The maximum thickness of the metal is the middle of the central stream of the final profile, mm

Is minimal. Tolgtsina metal radial transitions of the central stream of the final profile, mm

Possible reduction of the initial cooking thickness, mm Note;

Analysis of the test results showed:

profiling the rims with a bend in the center of the brook, performed by dispensing, leads to an increase in the thickness of the metal in the middle of the brook, the thickness of the metal in the rounding zones (radius transitions) remains minimally permissible;

The rim profiling with process corrugations performed by dispensing leads to a certain decrease in the thickness of the middle of the bottom of the stream and a slight decrease in metal thinning in radius transitions. Od3, 50

3.50

3.50

3.23

3.41

3.70

3.23

20

2.85 9 o

0.33

However, alternating deformations that the rim profile undergoes during profiling are not allowed by the condition of further wheel operation (cyclic, alternating loads);

when the rims are profiled with technological corrugations in the zones of radius transitions, an increase in the thickness of the metal at the bottom of the stream occurs, and the metal toshtsina in radius transitions practically does not increase, since the thinning obtained during the formation of technological corrugations with a small radius does not The same IO Alternate deformation in the radial direction in the development of technology is not allowed by the condition of further operation of the wheel (cyclic, alternating load ruzka). it is compensated by draft when aligning the corrugations; profiling with corrugations made by the draft of zones adjacent to the radius transitions and the middle of the stream, 1199 3846 leads to a decrease in the thickness of the metal in the middle of the bottom of the stream and a decrease in thinning in the radius transitions by 0.33 mm, which allows reducing the thickness of the original billet.

Claims (1)

METHOD FOR PROFILING RIMS FOR WHEELS, providing for the formation of a rim stream with a bottom and roundings adjacent to the bottom, which, in order to improve the quality by reducing the thinning of the metal in the places of curvature, 'in the corrugation areas adjacent to the curvature, process corrugations are performed, the metal is moved in the radial direction when forming technological corrugations are carried out to the center of the rim in areas adjacent to the technological corrugations, and the height of the corrugations is chosen equal to no more than half the depth of the stream of the finished rim, and morning rim surface by moving the metal radially. direction relative to the axis of the rim · about t l the places of rounding are unformed • with respect to the bottom of the stream not less than