RU1644U1 - CONTINUOUS ROLLING MACHINE FOR MANUFACTURING PROFILES - Google Patents

Abstract

CONTINUOUS ROLLING MACHINE FOR PRODUCTION OF PROFILES, including loading devices, induction heating furnace, rolling stands, refrigerator with pockets, characterized in that the working stands of the mill are installed coaxially with the heating furnace, while the distance from the end of the furnace to the first stand must be at least 1.25C 1,3l, where l is the length of the opening wires of the first stand.

Description

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Continuous rolling mill for profile manufacturing

The utility model relates to rolling production and can be used in the production of high-quality profiles of small tonnage 1,1 and batch on small-gauge mills equipped with through-passage (roller) heating devices.

Known three-stand mill .tsuo 630/430 with sequential GVI arrangement of cages. The mill is designed to receive small-tonnage lots of profile blanks of turbine blades from long products in 3 ... 7 passes.

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The equipment of the mill includes loading devices, such as roller gas heating furnaces, three working stands, the first of which is reversible. The working stands are equipped with an advanced roller conveyor SHG with sh-tnekkami for the task of harvesting in kaleebr rolls. After rolling, the profile blanks are delivered to the refrigerator f, fig. 147.

The technological disadvantages of this mill include:

- a significant difference in the temperature of the workpiece due to the difference in the exit times of the front and rear ends of the workpiece from the continuous rolling furnaces, which leads to a decrease in the accuracy of rolling due to different broadening and rolling forces after rolling;

-low te1 / temperature of the end of rolling caused by the long duration of rolling due to reversal of the roll and

lack of continuity of rolling, which increases energy consumption and is important for proc

-the presence of mobile rolling tables at the working stands for transferring the roll from one caliber to another, which makes it difficult to automate the rolling process on the mill.

Known zigzag six-strand flocks 300 with a sequential arrangement of clet, excluding the process of continuous rolling. The equipment of the mill includes: two single-row induction heaters arranged in parallel and equipped with loading devices, six horizontal working cages, of which the first cloud stand .tsuo 400 is reversible, the rest are cages duo 300. The working stands are arranged in two lines. Scissors were installed in front of the chill dish and a circular saw for hot cutting 2, Fig. 3 6}.

The mill is designed for rolling small-tonnage batches of shaped sections with a cross-sectional area of 100 ... 2500 miS from round and square billets with a diameter of Sstorono) 30: ... 80 yul in 6..DO passes. In about, b} kzh ;; SHOY ReBersivny stand of 400 in zavrrp-justice

from the size of the cross section of the initial workpiece. I ... 5 passes are performed

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The disadvantages of this camp are as follows:

- the arrival of blanks to the first stand with a consequent temperature difference between the rear and the leading ends, which is explained by the different times of the exit of the front and rear ends of the workpiece from the induction heater;

- low rolling temperature in the last stands of the mill due to the significant removal of the stands from each other, which leads to an increase in energy consumption and rolls.

Closest to the proposed utility model is a continuous four-stand mill 300, including two induction-type continuous heating furnaces equipped with a loading unit; four duo work stands with horizontal rolls 300x200, of which a third stand can be installed with vertical rollers; outlet roller table, as well as rack cooler with pocket fl, p. 329, rice, 145, a.

Inlet heaters of the mill through passage are located in parallel, the distance between the heating devices is 8 m. The first and 1-stage furnaces are designed to heat workpieces with a diameter of 25 ... 40 barrels, and the second - workpieces with a diameter of ..70 gzh. The heated billet after leaving the rear end of the heater is rolled down on an inclined deck to the master roller table of the mill, which is equally removed from the ocel left and right induction heaters.

The mill is designed to receive small-tonnage batches of profiles with a cross section of 300 ... 2000 g2 in rods up to 7 m long. The starting material is jigs 2.5-g 5 m rods made of high-grade round or square steel with a diameter (side) of 25, ...

The main technological disadvantages of this mill include the following:

I. Significant decrease in surface temperature (by 50-150 ° C) of the front end of the heated billet by the time of its task in the mill, while the longer the billet and the faster the speed moving through the eductors, the greater the difference in metal temperature of the front and rear ends of the heated billet.

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To ensure the necessary: the rolling temperature of the front end of the workpiece in practical conditions is forced to increase the heating temperature of the workpieces in the hectors, which leads to an increase in energy consumption and metal waste, as well as to a decrease in the productivity of the heating elements,

2, Significant temperature difference in the rolling of the front and rear ends of the workpiece, which reduces the accuracy of rolling due to the existing oscillations transverse to deformation and rolling resistance along the length of the roll.

The above technological drawbacks are inherent in all mills, which are equipped with two feedthrough inductors 10G1 furnace 1 and are explained by the significant difference in the time at which the front and rear ends of the workpiece exit the inductor due to the low speed of the workpiece moving along the inductors (0.06 ... 0.2 1D / s) and significantly the length of the heated workpieces (2.5 ... 5 m). The difference in the timing of the output of the front and rear ends is determined by the ratio of the length of the workpiece to the speed of its movement in identical to the heaters. Depending on the capacity of the inductance installation and the cross-sectional area of the workpiece, the movement speed along the hector can be from 0.06 to 0.2 hl / s, while with an increase in the cross-section of the workpiece, the speed starts. The length of the heated rods reaches 5 m.

With the specified parameters of heating the rear end, the workpiece will leave the iBuctor after 83 ... 25 s after the front end, which is in the air for a while and cools. After the workpiece exits from the search engine, it rolls down obliquely on the master roller table and is fed into the mill, while the temperature of the front end of the workpiece is 50 - I500G lower than the back.

In order to avoid half rolls or scrap during the rolling of front billets, servicing personnel 1111 are forced to reduce the length of the initial billets or increase the heating temperature of the metal in the heatsuctor by 50-fI500G by decreasing the speed of movement of the billets along the heats. Obviously, the involuntary increase in the heating temperature of the billets increases the waste of metal and energy consumption, reduces the productivity of idhoctor, and, consequently, the mill.

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The technical task of the utility model is:

-snushnye burning metal and energy consumption;

-differentiation of marriage, breakdowns of vazh and on 1SH1Sh1Nikov Bazhovy support;

-increase in productivity of induction heater;

-increase rolling accuracy along the length of the rolled profiles.

The technical problem is achieved by the fact that the mill working stands are installed coaxially in a heating furnace, while the distance from the furnace end to the stand mill must be at least 1.25-g 1.3, where f. is the length of the lead-in wires of the stand mill.

In FigL presents a continuous mill for rolling high-quality section of the steel section, top view; in Fig. 2, hectuation mo, muzzle and the first mill stand, side view.

The proposed continuous mill for rolling high-quality sections of small tonnage in batches consists of a loading grate I, a master roller table 2, a feedthrough of an induction-type heating furnace, consisting of a base 3, on which induction modules 4 are mounted, chalk; the front end of which is equipped with conveying horns 5, and above nth non-driven attached horns 13. The rollers 5 have a group drive, which reliably provides the same speed of movement of the heated workpiece through all its reduction modules 4 of the heating device a.

From the end of the last hub 4 at a distance exceeding the length of the C-input wires 14 by 50 ... 75 MGL, oax

The first working stand 6 of the mill is installed in the lead, but not for the rest of the stand. All working stands are advanced and can move perpendicularly to the axis of the inductors, which allows you to maintain alignment of the rolling line and the inductors when changing gauges to important ones.

Behind the last stand of the mill, a diverting roller 10 is installed coaxially with the axis of the inductors, along which the rolled strips enter the rack-type refrigerator II, and from it into the pockets 12,

Rolling at this continuous mill is carried out as follows, in the following way. Previously, round billets with a diameter of 30 ... 65 mm (or equivalent square billets) 2.5 ... 5 m long lay down on the loading grate I, with which one by one they click onto the roller table 2, which sets the billets in the first gear the inductor 4, and then, using transporting 5 and pressure 13 rollers, the workpieces at a definitely constant speed are moved through the inboard bottom modules 4, as they move through the workpiece inductors, they gradually heat up and, subsequently, they reach the set heating temperature.

Heated to the required value 1 SCH1: LO2 of temperature, the workpiece 15 is fed into the rolls of the first stand and rolled, while the speed of the workpiece 15 at the entrance to the deformation zone is equal to (synchronous) the speed of movement along the inductors. Synchronizing the speed of movement of the workpiece through the induction modules, the muzzle, and the speed of rolling in the first stand provides the same metal temperature when rolling along the length of the workpiece independent of the speed of movement along the inductors and the length of the original workpieces, and the insignificant distance to the meled by the next inductor and the first stand guarantees a minimum crosslinking temperature of the heated billet (pia 5 ... IO ° G) before entering the rolls of the first stand.

The strip rolled in the last stand enters the roller table 10, and from it is transferred to cooler II, after which the strips are cooled and dumped into pocket 12, where they are packaged in packs weighing 5 ... bt.

The proposed continuous mill for rolling varietal profiles of a small part made of round and square billets with a diameter (sides) of 30 ... 65 mm has the following, which was produced by the devices before the prototype:

1. The heating temperature in the conductors is reduced by 50 ... 150 ° С, which significantly reduces the waste of metal and the consumption of energy / w,

and also increases the durability of the lining of the inode mo, mule11.

2. Decrease in heating temperature, which increases the productivity of heating devices, and, consequently, the productivity of the mill.

3. The constancy of the rolling technology along the workpiece, which increases the accuracy of the profile according to the roll, reduces the scrap quality and profile size, and also reduces the number of breakdowns of the rolls and their bearings due to the lack of rolling of the contracted front ends of the workpieces.

4. The fastening of mobile working cages allows the use of rolls with a sturdy bottom barrel, on which a larger number of calibers is cut, which significantly reduces roll consumption, the number of transshipments and significantly reduces the roll park.

5. The increased use of billets of the maximum length (if the length of the chilled part allows laying the rolled strip), which increases the manufactures of the mill and reduces the consumption of metal for cutting.

The technological advances described above can significantly improve the technical and economic performance of a continuous mill equipped with a heating mill, as compared with a prototype mill.

This technical solution was implemented in the calibration workshop of JSC ChSPZ with the installation of a two-sheet continuous mill 300, equipped with a single-row induction - heater. The mill rolls hexagonal steel with a diameter of 26 ... 38 gzh low tonnage As a starting material, bars of round experience with a diameter of 32 .., 48 mi and a length of 3 ... 5 meters are used. The rolling process proceeds stably without violating the conditions of capture. Stan.polozvit quickly execute small-tonnage orders for calibrated hexagonal steel with no hot rolled hexagonal rolling stock supplied by metallurgical plants.

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The main sshenflD, ;; “|; | 1 -U1 -V Maksyutov

, .GD P poitsky / rolling mill%

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10 Sources of information received in conjunction with the corresponding application for a utility model:

1. Modern development of rolling mills. Tselikov A.I., Zyuzin V.I., M., Metallurgy, 1972, p. 334, fig. 147, d ;.

p. 339 t-330, fig. 145, a.

2. Rolling special irofilezh complex shape. Esipov. et al., K.: Tech. a, 1985, p. 29-gZO, pic. 3, b.

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Claims (1)

CONTINUOUS ROLLING MACHINE FOR MANUFACTURING PROFILES, including loading devices, an induction heating furnace, rolling stands, a refrigerator with pockets, characterized in that the working stands of the mill are installed coaxially with the heating furnace, while the distance from the end of the furnace to the first stand must be at least 1.25 ^o C 1,3l, where l is the length of the opening wiring of the first stand.