SU1389903A1 - Method of manufacturing roll-formed unequal channels having a stepped wall - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to the profiling of strip billets in rolls of section bending mills. The purpose of the invention is to improve the quality of profiles. On the first transitions, an unequal half-length profile with a width of a larger shelf equal to the total width of the smaller channel shelf, and an adjacent element of a stepped wall, and another shelf made from the peripheral section of the larger channel shelf are formed from the band blank. In the section of the blank for a larger shelf of the channel, when forming a coarse profile, its side wall is curved in an arc, and the shelf is mated with a curved side wall tangentially. Then, after shaping the stepped wall, the profile simultaneously bends the smaller shelf of the channel and straightens the curved section of the workpiece, forming a large shelf of the profile. On the last transitions, counter channeling of the channel shelves is carried out, placing their edges in a plane parallel to the profile plane. The method eliminates the transverse deflection of the larger shelf of the channel, the smth of the surface and allows you to expand the range of profiles. 1 il. I (S with

Description

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The invention relates to the machining of metals by the pressure of a sheet material in rolls of a roll forming mill and is intended for use in the manufacture of curved unequal shelf profiles (seam; 1 levers) with a stepped wall in metallurgy and mechanical engineering.

The purpose of the invention is to improve the quality of profiles by reducing the deflection of the larger shelf of the channel and eliminating the sm of its surface.

The drawing shows a diagram of the molding of unequal channel channel with a stepped wall.

In the manufacture of an unequal-pole channel with a stepped wall after the first transition (master), in the II-VI transitions from the strip blank 1, initially unequal hem forms a unequal half-square profile with the width of the larger shelf 2 equal to the total width of the lower shelf 3 of the channel 3 and adjacent to it element of the stepped wall 4 and another shelf 5 made of the peripheral section of the larger shelf of the channel. At the same time, in the section of the blank for a larger shelf of the channel, when shaping the gutter profile, its side wall 6 is curved in an arc, and the shelf 5 is mated with a curved side wall tangentially.

Then, after forming the element of the stepped wall of the profile (transition II), the smaller channel shelf is bent at the same time and a larger channel channel is formed by straightening its temporarily curved section 6, after which at the last transitions (X and XI) the profile is formed by counter-folding more than 7 and less than 8 shelves of the channel, while ensuring the placement of edges in one plane X | X |, parallel to the profile plane XX. The curvature of the side wall of the cuck profile and its straightening should be carried out continuously at the transitions. With this curvature

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- p - maximum is reached - in transition

when the angle of the hem of the side wall reaches a maximum (VI transition at an angle of 90 °).

The method can be implemented by means of calibration of rolls, developed in accordance with the proposed method for the manufacture of curved unequal shelf channels with a stepped wall on a bending mill. So, the production of an unequal channel channel 315Х150Х50Х ХИОХ60Х6 mm from steel is produced at mill 2 - in And technological transitions.

i (immediately after the I transition (task- i l.uero) in the I-VII technological transfer .43 strip blanks, an unequal shelf profile of 150X50X225X30X6 mm is formed with a width of a larger shelf equal to 225 mm and a smaller shelf of 30 mm. In this case, the side wall The hopper profile containing the smaller shelf is curved along an arc of a circle with a radius of Rb 30 mm.

In this case, the bending mode of the larger field is determined from the condition of equality of the vertical movements of the edges of the shelves and is 15-30-45-60-75-90 ° at the transitions, respectively. Then, in the VII-VIII transitions, the profile is further formed by straightening.

a pre-curved side wall of the pan profile and at the same time bending the smaller shelf of the channel to form a larger shelf of the channel. Then, with the simultaneous counter-bending of the large and smaller shelves, the profile of the doform0 is up to the specified dimensions. In this case, the edges of the shelves are placed in one plane parallel to the profile plane.

In the process of forming a profile

5, according to the proposed method, the helical twisting is 0 ° 15 -0 ° 30 per 1 m length, which is within the limits of the requirements. Longitudinal deflection is 0.6-0.8 mm per 1 m length and deviations of the hem angles between the elements

0 profile from the set does not exceed ± 0 ° 30. According to the calculated data and experimental testing on the 2 - 8X199-600 mill, the proposed method of making curved unequal-leg channel channels with a stepped wall in comparison with the known method makes it possible to produce these profiles of the required quality of a wider assortment (with relative width of the WBP / Vmp 2 being bent.

The proposed method provides an improvement in the quality of the profiles by reducing the deflection of the larger shelf (the transverse deflection of the larger shelf of the profile during molding according to the invention is up to 0.1 mm, while in the manufacture of such profiles according to a known method, the transverse deflection reaches 1.5 -2 mm) and elimination of surface smudging at the places of temporary bending of the larger shelf (see at the places of temporary curvature and conjugation of the side wall of the pan profile and shelf Q according to the proposed method is absent while Nome method holds local thinning of up to 5% and the term cm surface).

The application of the proposed method in the production technology of curved profiles 5 will allow, in comparison with the known method, to expand the range of manufactured unequal-angled channels with a stepped wall used in agricultural machinery and car building, the production of which was not mastered earlier due to technological difficulties.

Claims (1)

Invention Formula A method of making curved unequal shelf channels with a stepped wall along transitions in rollers according to which an unequal half-cuff profile is initially formed with one width of shelves equal to the total width of the smaller shelf of the channel and adjacent, its step-wall element, and another shelf with a width corresponding to the peripheral section of the greater shelf of the channel, and on the last passages, the profile is reformed by the opposite bend of its shelves, characterized in that, in order to improve the quality of the profiles by reducing neither the deflection of the larger shelf of the channel and the elimination of its surface, when forming the trough profile in the preparation section corresponding to the larger shelf of the channel, the side wall of the trough profile is curved along the arc, and the shelf is matched with it tangentially, then the guse of the forming of the stepped wall element at the same time, the lower flange of the channel will be hemmed and the temporarily curved section will be straightened to a flat state with the formation of a larger channel shelf, and when deforming the nro-fil with opposite hem Lok will stir its edges in one plane parallel to the profile plane. 0 I transition - I-sh W-TI /