Steel trough profile and method for its production

FIELD: technological processes.

SUBSTANCE: profile includes base, horizontal and lateral shelves of given size. Lateral profile shelves of given thickness feature vertical slits of defined width at defined distance from each other. Method involves preliminary perforation of edge areas of strip blank to form slits of given size, and further blank element overcast in rollers of profile bending mill to form final cross-section. Slits are made at definite tilt against lengthwise axis of blanks. After profile forming, obtained lateral shelves are rolled out in die clenching horizontal shelves by puncheon contacting profile base to reach vertical position of slits in lateral shelves.

EFFECT: reduced metal consumption of articles and constructions without adverse effect on durability characteristics.

6 cl, 2 dwg, 1 ex

 

The invention relates to characteristic the rolling profiles and their manufacturing techniques and can be used in the manufacture of lightweight steel u profiles.

Lightweight profiles of different configuration are usually made profiling, i.e. serial pogibli elements bandpass billet specialized in rolls of a rolling mill. The types of such profiles, and technology of obtaining them is described, for example, in the book edited by Istoricheskogo "Production of roll-formed sections (equipment and technology)", M, "metal", 1982, p.9-15 and 243-250. Varietal curved profiles often perform perforated, i.e. with through holes on their individual elements (see ibid., s-278).

Known bent profile trough type that contains average and marginal vertical and horizontal elements, paired plots of bending, the middle horizontal element is made convex outward (see A.S. SSR No. 1726086, CL 21D 5/06, publ. in BI No. 14, 1992).

The lack of profile is relatively large for its metal content.

Closest to the claimed object is trough profile is given in GOST 8283. It contains a base, horizontal and lateral (vertical) shelves of a given size and is characterized by the fact that the horizontal and the side shelf is equal to the between them, i.e. the profile is made equal.

A disadvantage of the known trough profile is also relatively large for its metal content.

A method of producing curved profile trough type by consecutive transitions bended form his middle and vertical boundary elements, in which pogibko start from the middle of the vertical elements, pogibko vertical boundary elements produce after reaching the average vertical elements angle bended form 80°and pogibko elements for transitions produce successively smaller radii (see A.S. USSR №1726086, CL 21D 5/06, publ. in BI No. 14, 1992).

The disadvantage of this method is the absence of the operation of punching holes on the individual elements of the profile, which increases its intensity.

The closest analogue to the claimed method is a method of manufacturing a steel trough profile, comprising a shaping profile serial pogibli elements of the passband of the workpiece in the roll forming mill with getting the base, horizontal and lateral edges (RF Patent No. 2006315 C1, B21D 5/06, 30.01.1994).

The technical task of the present invention is the reduction of metal products and structures containing trough profiles, without reducing the strength of their characteristics.

To solve this problem, offer aemy steel trough profile, containing horizontal shelves, the base and side shelves of a given size, in contrast to the nearest analogue is made of steel with a relative lengthening δ5≥20% and has a thickness of 2...8 mm, and at his side shelves are made of vertical slotted holes, the distance between which is equal to (2,9 3,1...)·in, where in is the width of the slots is equal to 1,8 2,2...from the profile thickness; side shelves profile can be perpendicular to a horizontal or inclined thereto at an angle of 75...85°and the length of the slot is to be...0,85 0,80 from the height of the profile; in the method of manufacturing a steel trough profile, comprising a shaping profile serial pogibli elements of the passband of the workpiece in the roll forming mill with getting the base, horizontal and lateral edges, unlike the nearest analogue, previously marginal areas of the passband of the workpiece corresponding to the side walls of the profile, perform the slotted holes with an inclination to the longitudinal axis of the strip workpiece at an angle of 55...57°and after the forming of the profile are hood with lengthening his side shelves to ensure rotation slot to their vertical position on the side shelves profile in the stamp with clip horizontal shelves by the impact of the punch on the base profile; elongation Bo the new shelves profile when the hood may be equal to μ =1,20...1,22.

The essence of the proposed technical solution is to design profile and its manufacturing technology, which is designed lightweight (17...22%) in comparison with the known trough profiles of the same size, but without reducing its strength characteristics. Indeed, when pulling in the stamp side shelves profile with rotation slot is the hardening of these shelves, which fully compensates for a slight weakening from having a through slot. As a result, the possibility of reducing a metal content (weight) of various products and structures of the proposed trough profile without reducing the strength characteristics of these products and structures.

Declare trough profile is shown in figure 1, and figure 2 - diagram drawing his side shelves in the stamp shows a variant of the profile with inclined side shelves).

The profile (see figure 1) contains the horizontal base 1 and 2 shelves and side shelves 3, tilted (in our example) at an angle α=75...85° to the horizontal. The side shelves are made of the slotted holes 4, the width of which "b" is equal to 1,8 2,2...from the profile thickness S, and the distance between the axes of the slots l=(2,9 3,1...)·the height profile Height H and the height of slots h=(...0,85 0,80)N.

The slotted holes are symmetrical midline of the twentieth profile and they fo the s at some distance from shelves 2, due to the presence of curvature (bending) of radius R between shelves and side shelves 3, and between the shelves 3 and the base 1 profile.

Stretching of the side shelves profile before they reach the corner α to the horizontal and vertical position of the slot (see figure 1) is carried out in the stamp (see figure 2). While the shelves 2 are clamped elements 5 of the stamp and punch 6 acts on the basis of 1 profile, and when the movement of the punch down (arrow) occurs hood shelves 3 extension μ=1,20...1,22; profile height becomes equal to N, and the length of the slot h=(...0,85 0,80)N.

For example, if the profile is made of 20, having a tensile strength σin=50 N/mm2after drawing (elongation) of the side shelves on ε=20% (i.e. when μ 1,2) value σinon a plot of these shelves will be: σinin+1,6·ε0,76=50+1,6·200,76≈66 N/mm2(see reference Averatech and other "Mechanical properties of steels and alloys during plastic deformation", M., "engineering", 1971, s), i.e. hardening shelves - 32%.

Experimental validation of the proposed technical solution was implemented at OJSC "Magnitogorsk iron and steel works".

To this end, a roll forming mill 2-8×100-600 were made equal trough the profile thickness S=2...8. mm is C steel 3 KP with σ in=40...45 N/mm2and δ5=18...24% of different variants, differing values of angles α (from the 70° to 90°), of a width of slotted holes (within 1,5S...2,5S), the distance between them is l (2.5-in to 3.5 in), angles of inclination of the slits on the original flat workpiece (50...65°). Obtained trough the profiles pulled in the stamp μ=1,15...1.30 and with receiving slot h=(0,7...0,9)N.

The best results (getting profiles with maximum padding and reduced their weight to 22% in the absence of cracking and breaking the flatness of the side shelves) achieved using the proposed object. Deviations from the recommended parameters worsened performance.

Thus, reduction of the area of holes (when l<2.9 in,<a 1.8 S and h<0,8 N) reduced weight profiles not more than 16%, which is considered insufficient. The increase in same square holes (when l>3.1,>2,2 S and h>0,85 N) weakened the profile above the allowable value with the observed incidence of crack formation at the end parts of the slots (up to 12% of the profiles).

Also noted the occurrence of cracks on the profiles of steel δ5<20%.

When the angle of inclination of the slits (initial procurement) less than 55° to straighten (up to 90°) when drawing the stamp was achieved only when the μ>1,22, which caused excessive work hardening (hardening) of the side shelves the subsequent cracking on them when testing profile bending and torsion. When the above-mentioned angles over 57° after turning slits up to 90° (stamp) began their stretching (elongation) at μ<1,2, which caused the appearance of microcracks on the inner faces of the holes. When the hood μ>1,22 was observed above the work hardening of the metal.

Profiles of the recommended parameters were compared when testing for longitudinal bending and torsion with trough profiles of the same size and made of steel with the same σinand δ5. On the strength characteristics of the proposed profiles are not inferior known, taken as the closest analogue (see above), but were easier on 17...22%.

Thus, experimental validation confirmed the acceptability found technical solutions to achieve this goal and its advantage over the known object.

A feasibility study conducted in the Central laboratory of the plant, showed that the use of the present invention will reduce the metal products and structures with the use of the inventive steel u profiles on average by 3% while maintaining them all strength characteristics.

Specific example

Steel u profile with side shelves perpendicular to the horizontal, made of Art. 20 σin=50 N/mm2and δ5=23%, has a thickness of S=5 is m, height H=120 mm, base width of 60 mm and a horizontal shelf width 35 mm, the dimensions of the slot (see figure 1):=2S=2·5=10 mm; l=3b=3·10=30 mm; h=0,83·H=0,83·120=100 mm

Profiling of the workpiece with slotted holes, inclined to its longitudinal axis at an angle 56°. Bent trough profile has a height H'=99 mm, and after deformation in the stamp μ=1,21 - N=1,21·N'=1,21·99=120 mm

This profile is easier known (same size) is 20%, but with the same strength characteristics.

1. Steel u profile with horizontal shelves, the base and side shelves of a given size, wherein the profile is made of steel with a relative lengthening δ5≥20% and has a thickness of 2...8 mm, and at his side shelves are made of vertical slotted holes, the distance between which is equal to (2,9 3,1...)·in, where in is the width of the slots is equal to 1,8 2,2...from the thickness of the profile.

2. Profile according to claim 1, characterized in that its side shelves perpendicular to the horizontal axis.

3. Profile according to claim 1, characterized in that its side shelf is inclined to the horizontal at an angle of 75...85°.

4. Profile according to claim 1, characterized in that the length of the slot is...0,85 0,80 height profile.

5. A method of manufacturing a steel trough profile, including the shaping of the profile series is th pogibli elements of the passband of the workpiece in the roll forming mill with getting the base, horizontal and lateral edges, wherein the pre at the boundary areas of the passband of the workpiece corresponding to the side walls of the profile, perform the slotted holes with an inclination to the longitudinal axis of the strip workpiece at an angle of 55...57°and after the forming of the profile are hood with lengthening his side shelves to ensure rotation slot to their vertical position on the side shelves profile in the stamp with clip horizontal shelves by the impact of the punch on the base of the profile.

6. The method according to claim 5, characterized in that the elongation at the exhaust side shelves profile is μ=1,20...1,22.



 

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