RU2295409C1 - Universal stand for tube shaping - Google Patents

Abstract

FIELD: plastic metal working, namely equipment for making shaped tubes.

SUBSTANCE: universal stand for shaping tubes includes rolls with barrels forming closed roll grooved pass and having axes laying in the same diametrical plane. Said rolls are mounted in supporting chocks with possibility of changing cross section area of roll grooved pass. Two drive horizontal rolls with cone barrels and one vertical roll with cylindrical barrel (shaft of vertical roll is mounted in horizontal members of C-shaped support) restrict roll grooved pass with cross section in the form of equilateral triangle. Lower horizontal roll has rigidly mounted shaft; upper roll and vertical roll are mounted with possibility of motion in said diametrical plane in horizontal and in vertical directions.

EFFECT: lowered consumption of rolls, reduced cost of manufacturing process.

1 dwg, 1 ex

Description

The invention relates to equipment for metal forming and can be used for the production of shaped pipes.

Such pipes having square, rectangular, triangular and other cross-sectional shapes are made either on pipe-forming mills by sequential molding of the original flat billet, or by re-forming the round section to the desired one. In both cases, stands of various designs are used, similar to the working stands of rolling mills. Types and schemes of such stands are described, for example, in the book by A. A. Korolev “Mechanical equipment of rolling and pipe shops”, M., “Metallurgy”, 1987, p.52-54.

As a rule, universal stands containing two pairs of horizontal and vertical rolls, of which horizontal drives are usually driven, are used as finishing stands when forming profile pipes.

A well-known universal stand roll forming mill containing horizontal and vertical rolls mounted in the same vertical plane in two cartridges, moved with special screws (see book edited by I. S. Trishevsky "Production of bent profiles (equipment and technology)", M ., "Metallurgy", 1982, p.102-103).

The disadvantage of this stand is the need for transshipment (change) of rolls when switching to a new profile size, which increases the consumption of rolls and production costs.

The closest analogue to the claimed device is a universal four-roll stand for profiling pipes according to US Pat. RF №2201825, class B 21 C 37/08, publ. in BI No. 10, 2003

This cage contains rolls with barrels forming a closed gauge, the axes of which are located in the same diametrical plane and are installed in the pillow-supports with the possibility of changing the cross-sectional area of the caliber, and the horizontal rolls are made drive, and is characterized in that the pillows are placed in four L-shaped supports fastened by two rings at the inlet and outlet of the cage, and the diameter of all four rolls is the same and equal to (3.2 ... 4.0) dt, where dt is the diameter of the initial round billet pipe.

However, a cage of this design is unacceptable for forming profiled pipes with a triangular cross section.

An object of the present invention is to expand the assortment of profile pipes made from round billet pipes.

To solve this problem, a universal stand containing rolls with barrels forming a closed gauge, the axes of which are located in the same diametrical plane and are mounted in pillows-supports with the possibility of changing the cross-sectional area of the caliber, and the horizontal rolls are made drive, contains two horizontal rolls with conical barrels and one vertical roll with a cylindrical barrel, which form a caliber with a cross section in the form of an equilateral triangle; the lower horizontal roll can be made with a rigidly fixed axis, the upper and vertical rolls can be moved horizontally and vertically in the said diametrical plane, and the vertical roll support is made C-shaped, in the horizontal elements of which the axis of this roll is fixed.

The essence of the proposed technical solution is to change the design of the well-known universal stand, which makes it possible to manufacture with its help triangular profile pipes from round. Such pipes have greater rigidity (bearing capacity) than round and square (rectangular) pipes with the same metal consumption for their manufacture.

The proposed universal stand is shown schematically in the drawing.

The lower 1 and upper 2 horizontal rolls are mounted on rolling bearings in the respective pillows, bearings 3, located in the left (in figure 1) bed 4 stands. The axis of these rolls through couplings 5 are connected to a drive (not shown). Barrels of 6 horizontal rolls are conical. The movement of the upper of these rolls is carried out by vertical 7 and horizontal 8 pressure screws.

A vertical roll 9 with a cylindrical barrel is also mounted on rolling bearings in the horizontal elements (cheeks) 10 of the C-shaped support 11 located in the right frame 12 of the stand. The movement of this roll horizontally and vertically is carried out, respectively, by pressure screws 13 and 14.

Both beds of the cage are attached to its base - plate 15.

The crate works as follows.

The molded round billet pipe under the action of rolls forming a gauge takes the required section shape. If it is necessary to switch to a triangular section of new dimensions, the upper roller 2 is moved left and down, and the vertical roller 9 is left and up (when the section is reduced) or the roller 2 is moved to the right and up, and the roller 9 to the right and down (when the section is increased).

After fixing the pressure screws, the cross-sectional formation of new sizes is started.

Fundamentally profiling of the required pipes can be carried out in a three-roll stand, the rolls of which have axes located at an angle of 60 ° to each other (for a cross section in the form of an equilateral triangle). However, this design of the stand will significantly complicate its drive, especially taking into account the necessary movement of the rolls in two directions.

Experimental verification of the claimed stand was carried out at OJSC "Magnitogorsk Iron and Steel Works". For this purpose, in the two stands shown in the drawing and sequentially installed behind the electric welding mill, round triangular tubes of different sizes with a section in the form of an equilateral triangle were formed from round billet pipes with a diameter of 40 to 120 mm with a wall thickness of 1 ... 4 mm. Pipe Material - steel with a tensile strength _{in the} b ≤550 MPa.

With experimental profiling, up to 99.5% of the obtained triangular pipes met all the requirements for their quality and geometry.

The universal four-roll stand, chosen as the closest analogue (see above), was not used in these experiments due to the impossibility of obtaining profile triangular pipes with its help.

Thus, a pilot test confirmed the acceptability of the technical solution found to fulfill the task and its advantage over the known device.

According to technical and economic studies conducted at the Central Control Laboratory of OJSC MMK, the use of the proposed stand will expand the assortment of profile pipes manufactured at the plant. At the same time, the use of triangular pipes instead of round and square, for example, in construction will reduce metal consumption by at least 15%.

Concrete example

A universal three-roll stand for profiling pipes with a cross section in the form of an equilateral triangle is made in accordance with the diagram shown in the drawing.

As a workpiece, round pipes are used from ordinary and structural steel grades with a b _of ≤550 MPa with a diameter of 40 to 120 mm and a wall thickness of 1 ... 4 mm.

Horizontal drive rolls of the stand are made with barrels having diameters d = 300 and D = 440 mm. Single roll - with a cylindrical barrel with a diameter of d = 350 mm and a length of l = 140 mm.

Roll drive - from an electric motor with a power of 15 kW; profiling speed (maximum) - 0.5 m / s.

Claims (1)

A universal stand for profiling pipes containing rolls with barrels forming a closed gauge, the axes of which are located in the same diametrical plane and are mounted in pillows-supports with the possibility of changing the cross-sectional area of the gauge, and the horizontal rolls are driven, characterized in that the stand contains two horizontal rolls with conical barrels and one vertical roll with a cylindrical barrel, the axis of which is installed in the horizontal elements of the C-shaped support, forming a gauge with a cross section in the form of equilateral a triangle, while the lower horizontal roll is made with a rigidly fixed axis, and the upper and vertical rolls are movable in the said diametrical plane horizontally and vertically.