SU1424900A1 - Method of producing steel wire or rods - Google Patents

Abstract

This invention relates to the production of steel wire bars. The purpose of the invention is to improve the mechanical properties. The wire is rolled in multi-roll gauges. The subsequent drawing is carried out with compression g in accordance with the ratio (100 100 / 2d, where d is the diameter of the finished wire. Drawing in these modes eliminates rolling defects. The change in deformation patterns on the proposed drawing modes favorably affects the stress-strain state transverse and longitudinal directions. There is a change of systems and slip lines, as well as the inclusion of previously unused slip systems in modes that allow plastic deformation without forming their defects. The ductility of the material increases. Further plastic deformation of such a wire occurs with a considerable reserve before the destruction. As a result, its performance is sharply increased. 2 tabs (L 4 CO

Description

This invention relates to the production of steel wire or rods.

The purpose of the invention is to improve the mechanical properties.

The process is carried out as follows.

The original wire rod is curled into a circle of different diameter. Rolling is carried out on an uninterrupted 4-pass rolling mill with a 3-roll gauge with a total reduction of at least 20%. A single reduction in the aisles (on average) is 20–35%. Then, the initial round rolled wire is dragged in monolithic drawstrings, while drawing the reduction is calculated by the formula

100 . 7

Q

100 2d

where d is the diameter of the finished wire.

The mathematical expression of the range of modes of reduction during finishing drawing (calibration), providing a positive effect of improving the plastic properties, was determined experimentally.

The proposed mode of finishing wolf of a round billet, laminated in multi-roll calibers, determines the new qualities of the produced wire. The emergence of new qualities is explained by the following factors.

After rolling, the surface finish of the finished wire, as well as the difference in length of the length (and in some cases, the distortion of the sectional shape from the correct one) reduces the potential plastic properties of the finished wire by creating a certain level of concentration of microstresses. During rolling, due to advancing and lagging in the contact areas on the metal surface, areas with tensile stresses are formed. Despite their small fraction, cumulative with other adverse microcavity residuals, they reduce the level of plastic properties of the metal. The finishing operation of the dragging with the proposed modes eliminates the disadvantages of rolling, improves the surface cleanliness, evens out the shape, eliminates the soil flow, reduces the anisotropy of the properties along the length — sections with a smaller section, i.e. more naklepannyh, and plots

with a large cross section - less naklepannyh. In addition, what is important, the change in the deformation patterns in the proposed modes (namely, the rolling patterns in multi-roll gauges and the drawing scheme in monolithic drag) favorably affects the stress-strain state.

billet in the transverse and longitudinal directions, making it softer,

In this case, a change of systems and slip lines will occur, as well as

the inclusion of previously unused slip systems in modes that allow plastic deformation without the formation of internal defects, i.e. noBbffijaeT plasticity

material. Further plastic deformation of such a wire is provided with a considerable reserve until destruction, i.e., its performance increases dramatically,

Crimped drawing (g)

. 100 S 2G

where d is the diameter of the finished wire, does not increase the complex of properties (in particular, plastic) due to the non-working surface and the section of the rolled wire. Such shrinkage does not result in deformation of deeper 1-st metal layers, and the incorporation of new slip systems is not possible. Dragging with

100

compressing (g) more than --- + 7, where d is the diameter of the finished wire, neutralizes the effect of increasing plastic properties due to the development of plastic deformation by drawing to form internal metal defects, i.e. The dragging as a technological operation of deforming a metal comes forth with all the flaws inherent in this process. Pointing strain leads to an accumulation of internal defects, along with an increase in strength properties, a decrease in plasticity occurs.

The best mode of compression to ensure the best complex of mechanical properties is 0.65-0.7

from the top border;

VET 7d (-)%.

The rolling mode in multi-roll calibers should be carried out in such a way.

31

way, so that the benefits of rolling can be used. To achieve this goal, the minimum total deformation should not be less than 20%.

PRI me R. In order to test the proposed method, wire with a diameter of 5.0, 6.0 and 8.0 mm was made from the same blank with a diameter of 10.0 mm from 65 steel. Wire was manufactured on an uninterrupted rolling-gauge line. The line includes a four-rolling mill block with 3-roll gauges and a single-draw drawing mill. Rolling a round billet to obtain finished wire with a diameter of 5.0 mm was carried out according to the scheme circle - cross triangle - circle in four passes. By adjusting the rolls of the second pair of stands, the size of the preparatory roll TOBKli and the finished rolled rolls changed

The wire fabrication mode is presented in table. one.

The mode numbers for the variant correspond: mode 1 is less

lower bound (t -),%; mode 2

X 1 00 „

lower limit (mode 3 0,65-0,7 from the upper limit

(-t- +7),%; mode 4 upper bound (- + 7),%;

mode 5 more

upper bound (7 7),%

where d is the diameter of the finished wire.

Rolling carried out on the size of the circle for calibration 5.25; 5.27; 5.53; 5.85 and 5.90 mm (pl. I, option i). Then, these blanks were calibrated in a single pass in a 5.0 mm diameter die. The original billet and calibrated were tested for discharging.

45 boat rolling of the original wire rod in multi-roll calibers and subsequent drawing, which, in order to improve the mechanical properties,

50 drawing set in the following limits:

The rolling of a round billet for calibration for a diameter of 6.0 mm (Table 1, option II) was carried out in two passes in a circle — a cross triangle — a circle in cages with 3 roll gauges. Then, similarly to variant I, the rolled stock is ggg where d is the diameter of the finished wire.

100

T

. 100 S 2d

personal diameters dragged to a final size with a diameter of 6.0 mm.

Rolling a round billet for calibration for a circle with a diameter of 8.0 mm was carried out according to the scheme circle - a circle with a collapse - a circle in two passes in cages with 3-roll gauges. Then the rolled billet was calibrated at a diameter of 8.0 mm (Table 1, variant III).

At the same time, rolling and pure calibration of wire with a diameter of 5.0, 6.0 and 8.0 was carried out according to a known method.

Mechanical properties. Wires are presented in Table. 2

Thus, the proposed mode of wire rolling in multi-roll gauges of wire makes it possible to drastically improve the complex properties of the finished wire. So (the optimal mode in the proposed method), in General, the relative change in the properties of the prototype amounted to. %:

For wire diameter - mm, mm

5.0 6.0 8.0

0

five

Temporary resistance to rupture Relative elongation after rupture Number of kinks

Number of twists

+ 2,1-t-7,6 47

flOO + 36.6 +27.0

+ 193 + 116.6 +144.0

+ 107.1 + 137.5 +128.6

40

Claims (1)

Invention Formula The method of production of steel wire or bars, including cold rolling of the original rod in multi-roll gauges and subsequent drawing, characterized in that, in order to improve the mechanical properties, 50 drawing set within the following limits: gg where d is the diameter of the finished wire. finished pr . 100 S 2dTable 1 Offer- I, Rolling the blanks Kn.diameter 10.0 mm on the circle and the subsequent drawing of a diameter of 5.0 mm Rolling a workpiece with a diameter of 10.0 mm on a circle and subsequent drawing on a diameter of 6.0 mm Rolling a billet with a diameter of 10.0 mm on a circle and subsequent drawing on a diameter of 8.0 mm IV.Diameter finished 5.0 mm V.Diameter finished 6.0 mm The diameter of the finished 8, O mm table 2 Note, in the numerator of the smallest and largest value. The denominator has an arithmetic average of 5-6 measurements.