RU2335365C2 - Stand of channeling mill - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: stand for the crimped strips contains upper and lower rollers established one over another with a clearance, creating the caliber of the set configuration enclosed by conic flanges of the lower roller. Circular grooves are located on the lower roller; a body of the upper roller is executed with a rubberised surface. Thus execute an inter-roller clearance depending on depth of the grooves and width of a formed strip. Internal edges of flanges of the lower roller are inclined to a horizontal under a certain corner of 83°...85°.

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

4 cl, 1 ex, 1 dwg

Description

The invention relates to equipment for metal forming and can be used on mills profiling corrugated strips.

Such bending mills are characterized by the presence of a large number of working stands (up to 30), usually containing two horizontal rolls, forming a caliber of a given configuration. Designs of stands of roll forming mills for forming corrugated strips are described, for example, in the book of I.S. Trishevsky and others. Production of bent profiles (equipment and technology). M .: Metallurgy, 1982, pp. 98-102.

Since corrugated strips are formed with corrugations directed upwards (to prevent injury to their peaks when moving along the rolling table of the mill), the upper roll of existing stands is made with circular grooves of the corresponding shape (their total number depends on the number of corrugations formed in this stand), and lower - with circular protrusions of the same shape.

There is a known working stand of a roll forming mill for forming corrugated strips, containing upper and lower rolls, each of which is made of forming, rolling and auxiliary elements forming roll barrels, and the diameter of the auxiliary elements is less than the diameter of the rolling elements by a certain amount (see.with. USSR No. 1381810, class B21D 5/06 from 04/30/86). However, such a stand is unsuitable for the production of corrugated sheets joined in a single unit with multidirectional (longitudinal and transverse) corrugations.

The closest analogue to the claimed object is a stand roll forming mill described in US Pat. RF №2056191, class B21D 5/06, publ. in BI No. 8, 1996

This cage contains the upper and lower rolls installed with a given clearance, forming a gauge of a given configuration, and is characterized by the fact that this caliber is closed by the flanges of the lower roll, which are conical with generators inclined to the horizontal at an angle of 78 ... 81 °. Known stand is also unacceptable for the production of combined corrugated sheets with multidirectional corrugations.

An object of the present invention is to expand the range of roll forming mill producing corrugated sheet profiles and reduce production costs.

To solve this problem, the roll forming mill stand for forming a panel-cassette of two corrugated strips is characterized by the fact that it contains upper and lower rolls installed one above the other with a clearance “H”, forming a caliber of a given configuration, closed by conical flanges of the lower roll, the lower roll is made with circular grooves under the longitudinal corrugations of the lower strip, and the barrel of the upper roll in contact with the vertices of the transverse corrugations of the upper strip is made with a gummed surface, while the size of the rolls th stand clearance is: H = (h + S), where h - the depth of grooves, S - thickness formable band; the inner edges of the flanges of the lower roll are inclined to the horizontal at an angle of 83 ... 85 °, the value h = (10 ... 40) S, and the number of grooves on the lower roll is 3 ... 9.

The essence of the claimed technical solution lies in the fact that the lower roll of the stand is made with circular grooves, and the upper roll with a smooth cylindrical gummed barrel. In this case, the roll gap is slightly greater than the double groove depth. This allows you to specify in the caliber formed by the rolls, corrugated strips superimposed on each other with corrugations of the same height, but in the opposite direction. The presence of conical flanges on the lower roll prevents the lateral displacement of the strips, and the selected slope of the inner faces of the lower roll flanges, firstly, facilitates the exact alignment of the two strips and, secondly, allows the bending of the lateral edges of the lower strip begun in the previous cages to form castle connection of strips.

The selected value of the roll gap provides for the passage through the caliber of bands only with corrugations of the same height. The need for gumming of the barrel of the upper roll is due to the fact that this barrel is in contact with the top of the transverse corrugations (that is, the contact area is very small), and this requires efforts to grip the strip with the roll, which is ensured by the increased coefficient of friction of the rubber – steel pair

As a result of this, it becomes possible to form a cassette panel composed of two corrugated sheets.

The drawing schematically shows the proposed roll forming stand.

The cage contains the upper 1 and lower 2 rolls installed with a gap of H = 2 (h + S). The barrel of the upper roll is made with a gummed surface 3, and its length L corresponds to the distance L 'between the bases of the conical flanges 4 of the lower roll or slightly less. The conical faces 5 of the flanges are inclined to the xx axis of this roll at an angle α = 83 ... 85 °.

On the horizontal section of the lower roll 3 ... 9 circular grooves 6 of arcuate cross-section are made. This roll is in contact with the lower strip 7 containing the longitudinal corrugations, and the upper roller is in contact with the upper strip having transverse closed corrugations 8. The lateral edges 9 of the lower strip (calibrated by dashed lines) in the gauge are bent by the flanges 4 at a given angle.

The height of all the corrugations is the same and is: h = (10 ... 40) S.

The crate works as follows.

The lower corrugated strip, located in all stands at the same level, enters the caliber while bending the side edges at an angle α. The upper strip after forming in the previous four-roll stand of the transverse corrugations with the help of a special bending roller device is lowered to the level of the lower strip and is superimposed on it in caliber - the formation of the cassette panel occurs.

If necessary, the size of the roll gap is adjusted by moving the upper roll with compression screws of a known design (with a decrease in the gap, the adhesion of the upper roll to the strip increases).

An experimental verification of the claimed stand was carried out on a roll forming mill of 0.5 ... 2.5 × 300 ... 1500 of OJSC Magnitogorsk Iron and Steel Works.

For this purpose, a mill of the proposed design was installed on the mill, the parameters of which were determined by the parameters of the manufactured panel-cassette. The thickness of the formed strips S = 0.7 ... 2.0 mm, and the value h of the corrugated strips connected in the stand was: h ₁ = 10 · 07 = 7 mm, h ₂ = 10 · 2 = 20 mm, h ₃ = 40 0.7 = 28 mm and h ₄ = 40.2 = 80 mm. The number of molded longitudinal corrugations of a semicircular shape was 3, 6 and 9. The lower rolls with conical flanges and an angle α = 80 ... 88 ° were tested.

The diameters of both rolls were the same - 350 mm; the thickness of the gummed layer on the barrel of the upper roll is 20 mm.

With the above roll parameters and α = 83 ... 85 °, there were no difficulties during stand operation, and up to 98.5% of cassette panels 1000 mm wide from st. 10 kp corresponded to the required indicators. At α = 80 ... 82 °, there was a mutual transverse displacement of the aligned bands with a deterioration of their castle joints. At α = 86 ... 88 °, the entry of the lower strip into the caliber was difficult, which caused the mill to stop with the need for manual lateral displacement of this strip.

The stand, chosen as the closest analogue, was not used in the experiments because of its apparent unsuitability for joining two corrugated bands. Thus, an experimental verification confirmed the acceptability of the technical solution found to achieve the goal and its advantage over a known object.

According to technical and economic studies conducted at the Central Laboratory of OJSC MMK, the use of the claimed invention will expand the assortment of roll forming mills producing corrugated sheet profiles and reduce production costs (compared with separate molding of two strips and their subsequent integration into a single whole) not less than 1.5 times.

Concrete example

The stand of the roll forming mill has the form shown in figure 1, and is designed for strips with a thickness of 0.7 ... 2.0 mm and a width of 500 ... 1200 mm from steel with d _at ≤450 MPa.

The diameter of both rolls is 350 mm, the length of the barrel of the upper roll L = 1000 mm, the thickness of the gummed layer is 20 mm.

On the lower roll there are 6 circular arcuate grooves with h = 40 mm. The size of the roll gap H = 2h + S = 2 (40 + 0.7 ... 2.0) = 81.4 ... 84.0 mm.

The angle of inclination of the inner faces of the conical flanges of the lower roll to the horizontal α = 84 °.

Claims (4)

1. A cage of a roll-forming mill for forming a panel-cassette of two corrugated strips, characterized in that it comprises upper and lower rolls installed one above the other with a clearance “H”, forming a gauge of a given configuration, closed by conical flanges of the lower roll, the lower roll is made with circular grooves under the longitudinal corrugations of the lower strip, and the barrel of the upper roll in contact with the vertices of the transverse corrugations of the upper strip is made with a gummed surface, while the size of the roll clearance of the stand is and H = (h + S), where h is the depth grooves, S - thickness formable band. 2. The cage according to claim 1, characterized in that the inner faces of the flanges of the lower roll are inclined to the horizontal at an angle α = 83 ... 85 °. 3. The crate according to claim 1, characterized in that the value h = (10 ... 40) S. 4. The crate according to claim 1, characterized in that the number of grooves under the longitudinal corrugations of the lower strip on the lower roll is 3 ... 9.