RU2264877C2 - Light type shape bending mill - Google Patents

Abstract

FIELD: rolled stock production.

SUBSTANCE: mill includes chain drive unit and successively mounted working duo-stands with rolls mounted in supporting chocks. Mill is doubled one; it has common drive unit providing separate operation of each mill or arresting of one mill. Stands are arranged by two mutually parallel rows. Drive unit is arranged between stands. Shafts of all stands may be disconnected from drive unit.

EFFECT: lowered metal consumption and cost of shapes, enlarged assortment of bent shapes.

6 cl, 2 ex, 2 dwg

Description

The present invention relates to the production of rolled products and can be used for the manufacture of cold-formed profiles.

Such profiles are produced on special duo mills with a sequential arrangement of working stands. For light bending mills using a strip billet with a thickness of up to 2 mm, it is advisable to use a chain drive, the advantages of which are described, for example, in the book of V.F. Rashnikov et al. "Production of bent profiles at the Magnitogorsk Iron and Steel Works", Magnitogorsk, RIO MSTU, 1999 p. 126-129.

Lightweight mills for the production of high-quality bent profiles of small cross-sections can be performed with benchless stands containing one pillow support for each (upper and lower) shaft, i.e. have console mounting of shafts and work rolls, which greatly simplifies the setup and operation of the mill. With a chain drive, the shafts of the stands are connected (usually by means of couplings) directly to the shafts on which the sprockets are fixed, enveloped by a roller chain (Gall).

The described mills can have both all-wheel drive (with drive of the upper and lower rolls) stands, and partially-drive (drive, for example, only the lower roll) stands and idle (without drive of rolls) stands, which is necessary to improve the surface quality of the profiles, in particular - with coatings of one kind or another.

Known roll forming unit of the light type, the mill of which contains four-wheel drive first two, intermediate and last stands, and part of the stands is made with brackets for supporting the chain rollers (see US Pat. RF No. 2078632, CL B 21 D 5/06, publ. In BI No. 13, 1997). A roll forming mill is also known, the working shafts of which consist of two half shafts connected by a thread with the possibility of self-tightening (see Pat. RF No. 2113926, class B 21 D 5/06, published in BI No. 18, 1998).

A disadvantage of the known roll forming mills of the light type is a small assortment of manufactured profiles and the relatively high labor costs during operation of the mills, due to the need to change (transship) the rolls when switching to a new profile size.

The closest analogue to the claimed device is a roll forming mill according to US Pat. RF №1819171, class B 21 D 5/06, publ. in BI No. 20, 1993

This light chain-type mill contains a series of sequentially installed duo stands, in which the shafts are fixed in pillows, and is characterized by the fact that the lower rolls of all stands are driven, and the upper rolls are driven in the first and last stands, moreover, the clearance is adjusted with the clamping screws of the pillows, bearings and rolling diameters of the upper rolls are 1.35 ... 1.45 times larger than the lower ones.

The disadvantage of this mill is also a relatively small assortment of manufactured profiles and increased labor costs for production.

Indeed, the assortment of any roll forming mill is limited by its main parameters, in particular, the length and diameter of the work rolls, which for mills, for example, of light type are within, respectively, 150 ... 180 and 25 ... 30 mm (see. for example, under the editorship of IS Trishevsky reference book "Production and use of bent profiles of hire", M., "Metallurgy", 1975, p.132). An increase in the dimensions of the working shafts leads to an increase in all dimensions and metal consumption of the mill and to its rise in price, moreover, difficulties arise in obtaining high-precision profiles of minimum sections.

In addition, when switching to a new profile size, usually all the mill stands must be transshipped with it stopped, which increases equipment downtime and labor costs for production.

An object of the invention is to reduce the metal consumption of lightweight mills and their cost, expand the assortment of bent profiles produced on one mill, and reduce labor costs for production. To solve this problem, a light-type roll-forming mill, containing a chain drive and sequentially installed working stands of the duo with mounting shafts in pillows, supports is double with a common drive of both units and with the possibility of independent work from one another or with stopping one of them, while stands are arranged in two parallel rows, the drive is installed between them, and the shafts of all stands are made with the possibility of operational disconnection from the drive; the shafts of each pair of stands of opposite rows can be connected to one, upper or lower drive shaft; the shafts of all stands of opposite rows can be connected to the drive shafts corresponding to them, and the axial vertical plane of the shafts of the stands of each row can not coincide with each other, but coincide with the middle of the inter-stand distance of the opposite row; the lengths of the shafts of stands of opposite rows can be different, with the same length of all shafts of the same row, and for stands with a shorter length of shafts, each of them is made with cantilever mounting in one support and with mounting of shafts in two supports for stands of the opposite row.

The essence of the proposed technical solution is to create the design of a "double" mill with a common drive, each version of which is designed for a specific purpose, moreover, both mills can work independently of each other, or with the stop of one of them.

So, if the minimum dimensions (and metal consumption) of the “double” mill are required, then both working shafts (upper and lower) of each adjacent pair of stands of both rows are connected by couplings with one shaft on which the drive sprocket is fixed. The number of shaft supports and drive sprockets for such a mill will be minimal. The angular velocity of the upper (lower) rolls of all stands of the mill will be the same, and the linear speed will depend on the values of their rolling diameters and this speed is constant for each row of stands.

If it is necessary to create different angular speeds of the shafts for each row (the linear speeds of the workpiece in each of them can vary significantly), the working shafts of the individual stands are connected to the drive shafts corresponding to them, but the axial vertical planes of the opposite adjacent stands do not coincide. If the length of the mill is not limited and the maximum convenience of adjusting each stand is required, then the mentioned vertical axial planes of one row of stands coincide with the middle of the inter-stand distance of the other row. The number of stands in each row may not be the same.

With different lengths of shafts in opposite rows of stands, it is possible to expand the assortment of the "double" mill, i.e. simultaneous use of different (in size and properties) blanks. In this case, a narrower workpiece can be profiled on a cantilever mill, and a wide one - on a double support, which ensures high quality of bent profiles, and, on a double support, it is possible (with the corresponding dimensions of the work rolls) to corrugate sheets.

With the simultaneous operation of both mills, it is necessary to have an uncoiler and cutting devices (scissors) on each of them, similar to those described, for example, in US Pat. RF №2183524 and №2103117, which are most suitable for high-quality lightweight mills. At the same time, the claimed mill requires one engine, one gearbox and one Gall chain.

Operational disconnection of the working shafts from the drive allows you to use the stands in any of the above options: full or partially drive, or idle (non-drive).

Figure 1 and 2 show the most characteristic schemes of the proposed designs of the "double" mill: figure 1 - corresponding to claim 2 of the claims, with the console execution of all stands, figa - corresponding to claim 6 of the formula, with cantilever and double support ( the widest range of manufactured profiles); figb - arrangement of the main equipment of this mill.

In the supports 1 of the stands of the "double" mill, working shafts 2 are installed, on one of the sections (external) of which the forming elements 3 are located, and on the ends of the shafts 2 from the drive side there are couplings 4 made with the possibility of quick disconnection from the drive. The drive shafts 5 are also installed in the bearings 6 and drive sprockets 7 are placed on the shafts, covered by a roller chain 8.

The supports 1 of all stands of the "double" mill are installed in two parallel rows on either side of the drive. In FIG. Figure 2 shows a design variant when each working shaft is driven from an independent sprocket and, thus, two supports (upper and lower) of the drive shafts fall on each stand. In this embodiment, the length l _{2 of the} working shafts of the right double-stand mill (in Fig. 2) is greater than the length l _{1 of the} shafts of the left single-stand mill, and the distance l between the vertical axial planes x ₁ x ₂ and x ₂ x ₂ is equal to half the inter-stand distance L (between axial planes x ₁ x ₁ and x ₃ x ₃ ) of any mill.

The "double" mill (9 and 10) also contains unwinders 11, scissors 12 and packaging devices 13. The chain drive contains power and idler wheels, a gearbox and an engine (not shown in the diagram).

The simultaneous operation of both mills and their individual work, as well as disconnection from the drive of any working shaft (or several), is possible. Transshipment at each mill and their adjustment are carried out independently of the other mill (including during its operation).

Installation of the proposed "double" mill is scheduled in LPC-7 of OJSC Magnitogorsk Iron and Steel Works. Preliminary calculations showed that with the same productivity, such a mill will occupy an area 20 ... 40% less than the two mills replaced by it, and its cost will be lower by about 25% with a decrease in labor costs of at least 15%. In addition, the number of staff will be reduced.

Case Studies

1. The roll-forming "double" mill of the light type (see Fig. 1) contains two rows of cantilever stands - 12 in each row. The size of the inter-span distance L = 500 mm. Rolling roll diameters of the left row of stands: upper - 175 mm, lower - 105 mm; the same right row - 200 and 110 mm. Forming height, respectively - 35 and 45 mm.

The drive of the “double” mill is chain, with two shafts, supports and sprockets for each pair of adjacent stands of opposite rows. Drive power - 35 kW; the profiling speed of the left mill is 0.5 m / s, the right - 0.6 m / s.

Profiled workpiece: thickness 0.2 ... 1.0 mm, width 20 ... 90 mm (left mill) and 0.4 ... 1.5 × 30 ... 140 mm (right mill) with tensile strength δ _in ≤50 kgf / mm ² .

The equipment also includes two uncoilers of rolled billet, two flying drum scissors (in front of the mill) and two stackers.

2. The "double" mill (figure 2) contains one row (left) of the cantilever stands (12 pieces) and one row of double bearings (13 pieces). The size of the inter-span distance L = 600 mm. Rolling roll diameters of the left row of stands: upper - 190 mm, lower - 105 mm; the same, right row - 210 and 110 mm. The molding height, respectively, is 42 and 50 mm. Distances between the vertical axial planes x ₁ x ₁ and x ₂ x ₂ - l = L: 2 = 300 mm.

For the chain drive of each stand, two shafts are used, two supports for them and two sprockets, enveloped by the Gall chain. Drive power - 60 kW; the profiling speed of the left mill is 0.5 m / s, the right - 0.7 m / s.

Profiled workpiece: thickness 0.3 ... 1.2 mm, width 20 ... 100 mm (left mill) and 0.5 ... 2.0 × 40 ... 250 mm (right mill) with tensile strength , respectively, δ _in ≤50 kgf / mm ² and δ _in ≤47 kgf / mm ² .

The composition of the additional equipment is as in example (1).

Claims (6)

1. A roll forming mill of a light type, containing a chain drive and sequentially installed working stands of the duo with mounting shafts in pillows, supports, characterized in that it is double with a common drive and with the possibility of independent work from one another or with stopping one of them, when this stand is located in two parallel rows, the drive is installed between them, and the shafts of all stands are made with the possibility of operational disconnection from the drive. 2. The mill according to claim 1, characterized in that the shafts of each pair of stands of opposite rows are connected to one upper or lower drive shaft. 3. The mill according to claim 1, characterized in that the shafts of all stands of opposite rows are connected to their respective drive shafts, and the axial vertical planes of the shafts of the stands of each row do not coincide. 4. The mill according to claim 3, characterized in that said axial planes of stands of one row coincide with the middle of the inter-stand distance of another row. 5. The mill according to claim 1, characterized in that the lengths of the shafts of stands of opposite rows differ with each other with the same length of all shafts of the same row. 6. The mill according to claim 5, characterized in that in stands with a shorter shaft length, each of them is made with cantilever fastening in one support, and in stands of the opposite row - with fastening in two supports.

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