RU2330741C2 - Profile-bending machine - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention is related to equipment for metal forming, in particular, to machines for production of cold bent corrugated sheet profiles, mainly for production of steel panel-cassettes from corrugated strips. Profile-bending machine contains decoiler, dressing machine, molding machine with working cages and aligning rollers and drive, flying shears and collecting roller table. Machine is equipped with additional decoiler and dressing machine. In duo cages of molding machine above the top roller concave supporting roller is installed. Behind duo cages coaxially aligning rollers are installed, 4-roller cage, device of double bending, three-four duo cages. Number of machine duo cages that are installed in front of 4-roller cage is equal to 12...20. Drive of machine is of chain type.

EFFECT: invention provides expansion of assortment of specified bent profiles and reduction of expenses during their production.

3 cl, 1 ex, 2 dwg

Description

The invention relates to equipment for metal forming, in particular to units for the production of cold-formed corrugated sheet profiles, mainly for the production of steel panels-cassettes from corrugated strips.

A roll forming unit is known, consisting of several molding mills installed in a row, on which corrugated sheets with various shapes of corrugations are obtained, and an assembly unit for preparing a workpiece roll is moved along the indicated row of mills, and a cart with a device for receiving and stacking finished profiles is moved behind a number of mills ( see Japanese application No. 61-189827, class B21D 13/00, publ. 23.08.86). However, on this unit it is not possible to manufacture cassette panels from two simultaneously corrugated strips.

The closest analogue to the claimed object is a roll forming unit with a roll method for manufacturing corrugated sheet profiles described in the book by I. S. Trishevsky et al. “Cold-formed corrugated rolled profiles, Kiev,“ Technika ”, 1973, p. 35-41.

This unit contains an uncoiler, a straightening machine, a molding mill with working stands and centering rollers and a drive, flying scissors and a discharge roller table. On this unit, it is also impossible to manufacture panels-cassettes from two simultaneously corrugated strips.

The technical task of the present invention is to expand the range of corrugated profiles and reduce costs in their production.

The roll forming unit contains an uncoiler, a straightening machine, a forming mill with working stands and centering rollers and a drive, flying scissors and a take-up roller table, unlike the closest analogue, the unit is equipped with additional unwinding and a straightening machine, and in the cages of the forming mill duo, a concave is installed above the upper roll supporting roller, coaxially centering rollers, a 4-roll stand, a double-bend device, three to four duo stands, the number of stands of the duo mill are installed after the duo stands data in front of a 4-roll stand is 12 ... 20, and the drive of the mill is chain.

The essence of the claimed technical solution lies in the development of the design of a roll forming unit capable of producing panel cassettes from two corrugated sheets: the lower one with longitudinal continuous corrugations and the upper one with closed transverse corrugations connected “into the lock”. In addition, if necessary, on this unit it is possible to produce sheet profiles with longitudinal corrugations of various shapes.

As a result of this, the technological capabilities of the unit are significantly expanded, and the availability of a number of original technical solutions allows to reduce production costs (for example, the presence of a chain drive simplifies and reduces the cost of its implementation and operation with a significant reduction in energy costs).

The proposed roll-forming unit is schematically shown in figure 1, and in figure 2 - part of the mill stand with a concave roller for the transported top strip (drive unit is not shown).

The roll forming unit contains two unwinders 1 and 8 for a rolled strip blank and two straightening machines 2 and 9 for straightening the upper and lower strips. The cages duo 3 of the molding mill are made with an additional concave roller 11 (see FIG. 2) for transporting and centering the upper strip and located above the upper roller 10 of this cage 3, vertical centering rollers 4 are installed in front of the cages 3. Coaxially mounted behind the group of cages duo 3 two pairs of centering rollers 12, a four-roll stand 13, forming two strips at the same time, with longitudinal continuous corrugations being formed on the lower one and transverse closed ones on the upper one.

After this stand 13, a device 14 is installed with two inflection rollers of the formed strip with transverse corrugations, defined (together with the lower corrugated strip) in the cage duo 15, in which both stripes are connected in one profile with the formation of locks on the lateral edges. This profile with flying scissors 6 is cut into measuring panel-cassettes going along the discharge roller table 7 to the packaging.

Roll forming unit operates as follows.

The bending unit serves two strips. The lower strip after the unwinder 1 of the straightening machine 2 passes through a molding mill with working stands 3, where longitudinal corrugations are profiled. Centering rollers are installed in front of stands 3. After the uncoiler 8 and leveling machine 9, the upper strip is transported and centered by additional concave rollers 11. Both strips pass through the centering rollers 12 and are fed into a four-roll stand 13, longitudinal solid corrugations being formed on the lower one and on the upper one - transverse closed. After this stand 13, the upper strip passes through the double-fold device 14. Then both strips are fed into the stand duo 15, in which the strips are connected in one profile with the formation of locks on the lateral edges. This profile with flying scissors 6 is cut into measuring panel-cassettes going along the discharge roller table 7 to the packaging.

A roll forming unit is possible, in which when profiling strips with only longitudinal corrugations, the unwinding strip sequentially passes through the lower straightening machine 2, the duo stand 3, the centering rollers 12, the four-roll stand 13 (between the pair of its lower rolls), the duo stand 15 (without which or any additional deformation of the strip) and is cut with scissors 6 into measured lengths.

An experimental verification of the proposed roll forming unit was carried out on the unit for the production of corrugated sheets of 0.5-2.5 × 300-1500 OJSC Magnitogorsk Iron and Steel Works.

The experiments showed that when forming strips with a thickness of 0.7 ... 2.0 mm and a width of 1.0 ... 1.5 m from st.08 and st.20 on the claimed mill, panel-cartridges of the required geometry with semicircular corrugations are obtained . The option of operating the unit with the molding of only one strip with longitudinal corrugations was also tested (there were no comments on the quality of the corrugated stripes).

It was found that with the number of stands of the duo of the molding mill (up to a four-roll stand) less than 12, the assortment of corrugated bands is narrowed significantly (by the number of longitudinal corrugations), and with 20 stands their sufficient assortment is ensured.

The unit, selected as the closest analogue, was not tested in the experiments because of its obviously unsuitability for the manufacture of double corrugated panel cassettes. Thus, an experimental verification confirmed the acceptability of the technical solution found to achieve the goal and its advantage over a known object.

Technical and economic studies carried out in the Central Laboratory of OJSC MMK showed that in the manufacture of panel cassettes, consisting of two corrugated sheets, on the inventive unit, production costs are reduced by 2.0 ... 2.5 times compared with costs necessary for the production of cassette panels from two alternately formed corrugated strips.

Concrete example

Roll Forming machine shown in Figures 1 and 2, produces a panel cassettes of two corrugated strips of steel with a strength b = 450 MPa _to 1.1 mm thickness, 1200 mm in width (the band with transverse corrugations) and 1,440 mm (lane c longitudinal corrugations).

The finished panel-cassettes have a width of 1200 mm and a length of 5 m. Their lateral edges are 60 mm wide on each side and have a thickness of 3.3 mm and are connected “into the lock”.

Claims (3)

1. A roll forming unit comprising an unwinder, a straightening machine, a forming mill with working stands and centering rollers and a drive, flying shears and a discharge roller table, characterized in that it is equipped with a double-bend device and additional unwinder and a straightening machine, while in the duo cages a forming mill, a concave support roller is installed above the upper roll, centering rollers are installed coaxially after the duo stand, then a 4-roll stand, a double-bend device and an additional But three or four cages duo. 2. The unit according to claim 1, characterized in that the number of duo stands located in front of the 4-roll stand is 12 ... 20. 3. The unit according to claim 1, characterized in that it contains a chain drive of the mill.

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