Method of high-rigidity profile molding

FIELD: technological processes.

SUBSTANCE: closed crimps are formed in sequence on a stripe blank in rolls in two cuts. Two lengthwise trapezoid crimps are made in the first cut. These crimps are parallel and symmetrical to the longitudinal profile axis, and are repeated in periods. The second cut forms traverse hemispherical crimps. Height of lengthwise and traverse crimps is equal. Traverse crimp crosses two opposite lengthwise crimps at half of their length. Traverse crimp ends are formed by sloping facets of lengthwise crimps, directed towards the longitudinal profile axis.

EFFECT: improved profile bearing capacity.

1 ex

 

The invention relates to the processing of metals by pressure and can be used in the manufacture of sheet profiles with high rigidity (DRI).

Such profiles are roll-formed sheet profiles with recurrent (closed) stiffening corrugations. Most often the corrugations have a trapezoidal or semicircular cross-section and extend along the profiles (symmetrically and parallel to their average centerline)and across (perpendicular to this line). Moulding technology DRI is described, for example, in the book Vratnica and other "Production of roll-formed profiles at the Magnitogorsk metallurgical plant", Magnitogorsk, RIO Bauman, 1999, s-125.

A known method for the production of DRI, wherein forming the closed longitudinal corrugations exercise with elastic clamping moldable strip rolls on certain areas with the foreground tension (see also USSR №1543654, CL VD 5/06 from 23.11.87 year). However, this method is acceptable only for forming DRI with longitudinal corrugations.

The closest analogue to the claimed method is a method for the production of DRI (U.S. Pat. Of the Russian Federation No. 1817715, CL VD 5/06, publ. in BI No. 19, 1993).

This method consists in successive forming rolls to strip the workpiece longitudinal closed corrugations of a given size and is characterized by the fact that con the act with the upper roller free side edges being formed of a strip of a certain width and vertices of the trapezoidal corrugations, and from contact with both rolls - mid lane also certain width.

The known method is also unsuitable for forming transverse closed corrugations, which limits the carrying capacity (bending stiffness) DRI.

The technical task of the present invention is to increase the bearing capacity of sheet profiles with high rigidity.

To solve this problem in the way of moulding profiles, high rigidity, including consecutive passages in shaping rolls for strip harvesting closed corrugations, in contrast to the nearest analogue, forming closed corrugations carried out in two passes, the first pass produced forming two longitudinal trapezoidal closed corrugations arranged parallel to the longitudinal axis of the profile, symmetrically in relation to it and periodically repeated, and the second passage thermoabrasion transverse semicircular corrugations, the height of which is equal to the height of the longitudinal corrugations, while the transverse corrugation intersects two opposite longitudinal flute closed in the middle of their length, and the ends of the transverse corrugation form from directed to the longitudinal axis of the profile of the inclined faces of these longitudinal corrugations.

The essence of the proposed technical solution consists in forming transverse corrugations, not going zanarini the verge of longitudinal corrugations, moreover, the ends of the transverse corrugations are formed of the inclined opposite faces of the two longitudinal corrugations. In this case, as shown by the experiments (see below), the transverse corrugations should only have a semicircular cross-section, and their height should be equal to the height of the longitudinal ribs.

As a result, significantly (1.4...1.5 times) increases lateral stiffness profile that increases their carrying capacity. This allows for the same load DRI (longitudinal-transverse corrugations and without them) to reduce their thickness by 10...15%, which gives a direct saving of metal and reduces the intensity of the products.

The proposed method of molding is implemented as follows.

Moldable strip harvesting is specified in the first stand roll forming mill, the lower roll which is made with the forming protrusions trapezoidal cross-section, located on the generatrix of the roll barrel and the upper roll - with corresponding depressions on its barrel. During the rotation of the rolls this cage on the band formed two upward longitudinal corrugation.

When entering the partially formed strip to the second crate mill, the rolls which are made with the tab (bottom) and depression (upper roll), when coincidence occurs forming a transverse semi-circular corrugation. To accommodate this flute in the middle of the lengths of the longitudinal corrugations of the rotations is their rolls both trains must be strictly synchronized.

Formed the band after editing in the appropriate straightening machine cut on flat areas between the longitudinal corrugations on the specified length.

Experimental validation of the proposed method was implemented on a roll forming mill 1-5×300-1650 OJSC "Magnitogorsk iron and steel works".

With this purpose in forming DRI with the longitudinal and transverse corrugations tested different ways of their production technology: with the corrugations of the same and different heights (longitudinal-trapezoidal, transverse, semicircular); with the corrugations of the same height, but trapezoidal shape (including cross), with corrugations in the form and of the same height, but the intersection of the longitudinal corrugations transverse and output ends of the latter beyond the outer faces of the longitudinal corrugations. The best results (output DRI required quality to 99.6%) was obtained when implementing the claimed technology. Variations worsened performance.

Thus, when forming the corrugations featured in shape, but of different heights, coupling of longitudinal and transverse corrugations were observed distortion of their shape and, in some cases, the appearance of cracks. Forming all of the corrugations with a trapezoidal cross-section has led to the rejection of up to 5% of the DRI for poor geometry of intersections of corrugations (appeared expansion of metal). The output ends of p the pepper of corrugations beyond longitudinal corrugations also distort the geometry of the intersections, and up to 1% of the DRI had cracks in these places.

The method selected as the closest analogue in the experiments were not tested because of its unacceptability to get DRI with the longitudinal and transverse corrugations. Thus, experimental validation confirmed the acceptability found technical solutions to achieve this goal and its advantages over the known object.

According to feasibility studies conducted in the Central laboratory of control of OJSC "MMK" using the proposed method in the production of DRI in roll forming mill 1-5×300-1650 plant will implement DRI with improved performance and reduce the consumption of metal for their production not less than 10%.

Specific example

High hardness 1350×2×1725×39,2×3.2 mm, containing 14 longitudinal and seven transverse corrugations with a height of 36 mm is formed in two passes: in the first are formed two longitudinal trapezoidal corrugation in the second transverse semicircular bumps, crossing the longitudinal, but not beyond their outer side faces.

The width of longitudinal corrugation - 200 mm, a transverse length - 800 mm, its width - 154 mm

Because of the profile of the transverse corrugations its thickness reduced from 3.6 to 3.2 mm, an increase of 11%.

Method of moulding profiles, high rigidity, including PEFC is therefore the aisles in shaping rolls for strip harvesting closed corrugations, characterized in that the shaping of closed ribs carried out in two passes, the first pass produced forming two longitudinal trapezoidal closed corrugations arranged parallel to the longitudinal axis of the profile, symmetrically in relation to it and periodically repeated, and the second passage thermoabrasion transverse semicircular corrugations, the height of which is equal to the height of the longitudinal corrugations, while the transverse corrugation intersects two opposite longitudinal flute closed in the middle of their length, and the ends of the transverse corrugations are directed to the longitudinal axis of the profile of the inclined faces of these longitudinal corrugations.



 

Same patents:

FIELD: technological processes; engines and pumps.

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EFFECT: reduced production cost due to simpler and cheaper machine drive.

3 cl, 1 dwg, 1 ex

FIELD: technological processes.

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FIELD: technological processes.

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Profiled sheet // 2324562

FIELD: construction.

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11 dwg

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2 cl, 2 dwg

FIELD: plastic working of materials, namely tools for making thin-web sections such as bands of ledges.

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4 cl, 3 dwg

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EFFECT: lowered metal consumption for making sections.

1 dwg, 1 ex

FIELD: plastic working of metals, possibly production of bent sections.

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2 dwg, 1 ex

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2 cl, 2 dwg, 1 ex

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EFFECT: enhanced consumer's properties of sections, lowered metal consumption for making them.

1 dwg, 1 ex

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EFFECT: enhanced consumer's properties of corrugated sheet sections, lowered metal consumption for making them.

4 cl, 2 dwg, 1 ex

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7 cl, 30 dwg

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EFFECT: lowered labor consumption of process for shaping sheet parts.

3 cl, 3 dwg

FIELD: plastic working of metals.

SUBSTANCE: method is realized due to applying successive local bending efforts during one or several transitions along bending lines and performing rotary local deforming between engaging deforming members. At least one pressure member is in the form of roller with curvature radius in cross direction less than curvature radius of part in the same direction. Axis for applying bending efforts is directed along lines normal relative to bending lines in plane and to plane of bent blank. Bending efforts are applied beginning from shortest butt cross edge of blank. Above mentioned bending lines divide cross section of blank by even number of pieces whose length is equal to bending pitch or proportional to it. Lengthwise edges of grooves are selected as near as possible to curvature lines of part surface with maximum and minimum curvature radius in each point.

EFFECT: lowered labor consumption of process for shaping sheet parts.

3 cl, 3 dwg

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