Method of molding of stamped formed profile

FIELD: technological processes.

SUBSTANCE: simultaneously perform feeding of two flat preforms of certain width in the profile bending machine at different levels for molding closed stamped formed profile consisting of two corrugated sheets with orthogonally related semicircular corrugations; upper one has smaller width, consecutive molding in the first two-high stands of direct corrugations on the lower strip, directed downwards, with overcast angles, diminished in a cogging direction with a certain angle of inclination of lateral faces of ready corrugations to a horizontal plane. Simultaneously perform transportation of the upper strip in a four-high stand, forming in one operation cross-section closed corrugations, directed up with the same height and an angle of inclination of lateral faces to a horizontal plane. Connect the upper strip to the lower after overcast in three last passes of side crimps of the lower strip up and at reaching of a certain corner. In last operations in two-high stands perform overcast of side crimps of the lower strip to a corner 180° with formation of interlock of both strips of the trebled width.

EFFECT: assortment expansion of channeling mill and decrease of cost.

4 cl, 1 ex

 

The invention relates to the processing of metals by pressure and can be used in the manufacture of corrugated bent sheet profiles.

These profiles are manufactured on specialized mnogoluchevykh mills, usually containing double-roll forming stands. When molding strip blanks forming the corrugations begin from mid bandwidth and consistently profiles toward the edges of the workpiece. Technology profiling corrugated strips is described in the book edited by Istoricheskogo "cold-formed corrugated profiles of car", Kiev, Tekhnika, 1973, p.132-144. The defining parameters of this technology is the ratio of the height of the corrugations and the strip thickness, the magnitude of the angle bended form the side elements of corrugations per pass and the magnitude of the bending radii of the metal.

A known method for the production of profiles with corrugations, in which the first passages formed profile with trapezoidal corrugations, the width of the wall of which is equal to the expanded width of the rounded tops of the finished flute, after which the wall corrugation reshape free flexible when Podlipki shelves corrugation (see A.S. USSR №778862, CL 21D 5/06, publ. 15.11.80 year). However, this method is acceptable for forming corrugations in the longitudinal direction and only one lane.

The closest analogue to the claimed method is with the royals production (moulding) corrugated sheets A.S. The USSR №1623817, CL 21D 5/06, publ. in BI No. 4, 1991

This method is a sequential forming of the corrugations of the specified shape and size and is characterized by the fact that the formation of each subsequent corrugation start after bended form of previous walls of the corrugations at an angle determined by the calculation dependencies. This method is also suitable for forming longitudinal continuous corrugations on one lane.

The technical task of the present invention is to expand the technological capabilities of the forming mill and reduced manufacturing costs by forming curved profile, consisting of two stacked together corrugated sheets.

To solve this problem in the method of forming a closed curved sheet profile, consisting of two corrugated sheets perpendicular semicircular corrugations height H in the range of 10...40 thickness of the workpiece S, including the filing with the roll forming mill at different levels simultaneously two strip blanks with a thickness of 0.7 to 2.0 mm, the upper of which has a smaller width, the sequential forming in the first two stands of longitudinal corrugations on the lower band, directed downwards, with the angle bended form, decreasing in the direction of rolling of 25° to 8° and the inclination of the side faces ready the corrugations to the horizontal α=84°...87° the simultaneous transportation of the top bands in the four-roll mill, which is formed in a single pass cross-closed corrugations, pointing upwards with the same values of N and αafter bended form in the last three passages of the side edges of the bottom strip up and when they reach the corner 83°...85° connect the upper strip from the bottom, and in the last passages in the two-high stands are sahibu side edges of the lower strip to the angle of 180° with the formation of the interlocking connection of the two strips with thickness 3S; the magnitude of the bending radii of the finished profile at the base of his ribs is equal to (10...12)S; band width with longitudinal corrugations is greater than the width of the strip with transverse corrugations 50...120 mm, education interlocking connection of the implement 7...8 passes with a maximum angle bended form for passage equal to 40°.

The essence of the proposed technical solution is the profiling of two bands with opposite corrugations (solid and closed) and in connection of corrugated strips in a single closed profile. Such a profile with ribbed recommended settings has isotropic stiffness, i.e. its length is equal to the width, the resistance to bending and twisting it equally in two mutually perpendicular directions.

Feature of the proposed method is also the fact that forming a continuous corrugations their tops facing down (the usual such corrugations always shaped tops up).

The proposed method is implemented as follows.

In roll forming mill serves (at different levels) two band-pass of the workpiece. Forming longitudinal corrugations on the bottom line starting from the first mill stands (stands - known, two-high, but with the "upside" calibers). The upper band just carry on going to a four-roll stand in which the morphology (in one pass) cross-closed corrugations on this band, and there is a connection (pad) of both bands with the early education of their locking connection, which continues in the future (in two-high stands) before the formation of the "castle". For its formation, the width of the lower band more than the top.

Experimental validation of the proposed method was carried out on the mill 0,5-2,5×300-1500 OJSC "Magnitogorsk iron and steel works", designed to profile corrugated sheets.

To this end one of the two-high mill was converted into a four-roll and two-high stands were made with grooves corresponding form. Podlipki side edges of the lower strip (with the formation of "castle") was implemented as the flanges of the lower rollers and vertical rollers mounted in the interstand intervals.

The best results (up to 98.6% of the finished profile which meets the specified requirements) obtained with the proposed method. The deviation from the declared parameters worsened performance.

So, at the height of the corrugations H<10 S obtained profiles (in particular, with S=0,7...1.2 mm) did not meet the required strength characteristics, and when N>40 S was observed cracking on flutes (especially on the transverse closed, being formed in one pass). When approximately equal to the angle bended form for the passage of elements of the longitudinal corrugations deteriorated flatness Migatronic plots, which were eliminated by differencing the values of these angles (consistent with their reduction from aisle to aisle).

At angles α<84° longitudinal and transverse corrugations decreased strength characteristics of the finished profile, and when α>87° transverse flutes were observed cracks. The imposition of the upper strip on the bottom, which side edges were bent at an angle less than 83° violated the necessary coincidence of the bands that led to the defects of the castle compounds. When the value of this angle over 85° observed cases of nesoedinimye two bands and the collapse of their edges in the caliber.

The decrease in bending radii at the base of the corrugations to (6...9)S in some cases led to the formation of cracks, and if R>12S weakened rigidity profile and decreased the duration of the working rolls campaign. If the difference between the widths of the two bands is less than 50 mm violated rocheste castle of their connection, and the increase in this difference over 120 mm caused the appearance of flatness of the connection.

Education locking connection 5...6 passes (to increase the maximum angle bended form) in some cases, caused cracks in the bend regions, and increasing the number of passes (more than 8) had no effect on the quality of the locking connection, but required additional stands.

The method selected as the closest analogue (see above), the experiments were not tested due to unfitness to receive a double profile. Thus, experimental validation confirmed the acceptability found technical solutions to achieve this goal and its advantage over the known object.

Techno-economic analysis conducted in the Central laboratory of JSC "MMK", showed that the use of the claimed invention extends the technological capabilities of existing forming mills and reduces production costs (compared with the technology of separate corrugation stripes with multi-directional corrugations and their subsequent connection) approximately 1.5...1.8 times.

Specific example

Two strips of a thickness of 1.3 mm and a width of 1120 and 1200 mm is formed into a profile consisting of two corrugated sheets; the bottom contains 5 corrugations semicircular cross-section with a width of 63 mm and height H=30 mm (i.e. H/S=23) is R=15 mm (i.e. R/S=11,5), located at a distance of 200 mm from each other; the top sheet has a transverse closed flute with H=30 mm R=15 mm and with a length of 950 mm, spaced from each other at the same distance. All of corrugations α=85°.

Forming longitudinal corrugations are with the angle bended form: 0→25°→49°→64°→78°→85° and bending radii (passages): 54,0; 27,0; 20,5; and 15.0 to 16.5 mm. Education locking connection starts after bended form the lateral edges of the lower strip 84° (and with the imposition of the strips to each other) and is 7 passes on mode: 0→20°→50°→84°→100°→135°→170°→180° and (maximum angle bended form - 35°).

1. The method of forming a closed curved sheet profile, consisting of two corrugated sheets perpendicular semicircular corrugations height H in the range of 10...40 thickness of the workpiece S, including the filing with the roll forming mill at different levels simultaneously two strip blanks with a thickness of 0.7 to 2.0 mm, the upper of which has a smaller width, the sequential forming in the first two crates on the bottom line of the longitudinal corrugations directed downwards, with the angle bended form, decreasing in the direction of rolling from 25 to 8°and the inclination of the side faces of the finished corrugations horizontal α=84...87° and odnovremenno the transportation of the top bands in the four-roll mill, which is formed in a single pass cross-closed corrugations, pointing upwards with the same values of N and αafter bended form in the last three passages of the side edges of the bottom strip up and when they reach the corner 83...85° connect the upper strip from the bottom, and in the last passages in the two-high stands are sahibu side edges of the lower strip to the angle of 180° with the formation of the interlocking connection of the two strips with thickness of 3S.

2. The method according to claim 1, comprising obtaining the magnitude of the bending radii of the finished profile at the base of his ribs, equal to (10...12)s.

3. The method according to claim 1, including the use of the band with longitudinal corrugations width, greater at 50...120 mm wide strips with transverse corrugations.

4. The method according to claim 1, including education locking connection 7...8 passes with a maximum angle bended form side edges for the passage equal to 40°.



 

Same patents:

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