SU1421780A1 - Strip treating process - Google Patents

Description

(21) 4219754 / 23-02

(22) 03/27/87

(46) 09/07/88, Bull. Number 33

(71) Institute of Ferrous Metallurgy

(72) Yu.A. Bogachev, I.A. Vakulenko, A.P.Kachailov, O.N.Kukushkin, Yu.G.Ktstsov, V.A., Pirogov and V.A. Chigrinsky

(53) 621.785,079 (088.8)

(56) USSR Copyright Certificate No. 1026850, cl. From 21 D 8/00, 1982.

For the UK of UK number 1476191, cl. C 21 D 7/14, 1976.

(54) METHOD FOR TREATMENT BAND

(57) The invention relates to the field of metal forming and can be used in ferrous metallurgy in the production of cold-rolled strips with compression of more than 15% of carbon steels. The purpose of the invention is to reduce energy consumption by reducing

hsgsla bends while maintaining high plastic properties of steel. The essence of the invention is that in the method of processing a strip that includes multiple bends of a strip on rollers with a radius not exceeding 50 times the range of the strip, with a tension for plastic stretching, the specific tension in the strip is set to in the range of 0.2-0.3 yield strength, and plastic elongation of the strip lead to a value of 0, - 0.6%. Band I bends around the tension drums 2 and 3, the amount of tension in the band is set according to the tension of the drive tension of the drums. On the rollers 4, the strip is beaten, and the value of three strip lengths is monitored by the difference in angular velocities of the tension drums 2 and 3 with the help of angle sensors 5 and 6. 2 ill., 1 tab.

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The invention relates to the field of metal forming and can be used in ferrous metallurgy in the manufacture of cold rolled strips with compression of more than 15% of carbon steels.

The purpose of the invention is to reduce energy consumption by reducing the number of bends while maintaining high plastic properties of steel.

FIG. shows a device for real estate 1 and the proposed method j a general view; Fig. 2 is a plot of the reduction in the yield strength of steel 20 versus the number of strip-deforming rollers;

The method can be implemented using the device (FIG. 1) as follows.

Band 1 bends around the tension drums 2 and 3 and the amount of tension in the band is established in a known manner with respect to the drive current of the cat: these drums so that the specific tension B the band corresponds to 0.2 0.3 G -, the rollers 4 bend strips, and as a result of joint bending with tension, the strip is plastically elongated. The magnitude of the strip elongation is determined by the difference in the angular velocities of the x-gat of the reels 2 3 using the angle of rotation sensors 5 and 6

The process is as follows. In a strip of carbon steel, tension5 equal to 0.2-0.3 of the yield strength is created and bent on two rollers with a radius not exceeding sh than 50 times the thickness of the roller. In this case, the radius of the rollers in advance; selected in such a way that the stretch of some bands was within

Of 1-0.6%, with insufficient elongation, a smaller radius is established, and with a greater elongation - larger radius rollers

Example, Studies performed on an experimental installation of flexural-tensile deformation with rollers with a radius not exceeding more than 20 times the thickness of carbon steel strip, show that at specific tension of the strip not more than 0.1 yield point elongation practically absent, and the yield strength is reduced by only 4-5%. At specific tensions x 0.4 yield and yield extension do02

stigma 2-3%, and the yield strength is also reduced by 4-5%, since simultaneously with the process of softening

hardening process (work hardening).

The specific tension range of 0.2-0.3 yield strength was experimentally established, when the reduction of the yield strength is maximal and reaches 10-15%. At the same time, the minimum strip elongation, which ensures such a decrease in the yield strength, is 0.1- 0.06% and depends on the preliminary degree of deformation,

The elongation of the strip, depending on the degree of deformation of the strip and the tension level, is given in the table.

20

25

thirty

20 40 60

Studies have shown that plastic elongation of the band above 0.6% does not lead to a decrease in the limit of current, honor, but requires the installation of more

45

number of rollers, and consequently, high energy consumption.

Analysis of the data in the table and graphs in FIG. 2 shows that the choice of tension in the range of 0.2-0, and elongation in the range of 051-0.6% allows the process of softening on two rollers, which leads to energy savings in comparison with a known way

A rough calculation shows that the energy consumption for plastic rounding by a 1.6 mm thick strip and a 1000 mm wide single roller of radius is 5 mm at a frequency of rotation

200 rad / s (roughly the speed of the STRIPS.5 m / s) is in the order of 6 kW,

Thus, with plastic elongation of carbon steel in the range of 0.1-0.6% on two bending rollers with a radius of no more than 20

3142

times the strip thickness, with a tension in the range of 0.2-0, the ST achieves the maximum reduction of the yield strength while saving at least 6 kW of electricity per: one roller,

Claims (1)

Invention Formula The method of processing the strip mainly cold-rolled with compression of more than 15% of carbon steel, including multiple bends on the role of JL mm 700600 300 1780 with a radius not exceeding 50 times the thickness of the strip, while simultaneously stretching to create stresses in the strip material and its plastic elongation by a specified amount, characterized in that in order to reduce energy costs by reducing the number of bends 10 while maintaining the high plastic properties of the steel, the tension creates a value of 0.2-0.3 of the yield strength of the steel, and the elongation is carried out to 0.1-0.6%. (:) tension 0.26g tension 0.36g  Compression 60% © o Compression 40%  compression of 20% 8 passwords cok