CN201211532Y - Two-wire bar split rolling and vertical turning flat subsection cooling device - Google Patents

Abstract

The utility model discloses a vertical rotating equal-section cooling device after double-slitting rolling of bar materials, which relates to a bar hot-rolling cooling device, which comprises a feed inlet, a double vertical cooler, a vertical rotating flat guide groove, a pinch roll conveying device, and a frequency conversion transporting roller table, wherein two cavities of the vertical rotating flat guide groove are horn mouth shaped at up-down positions and shrinkingly extend forward, and two bar s are horizontally and separately placed when reaching the positions of horn mouths. An air-cooled guide pipe and a water-cooled double horizontal cooler after the roller table are also arranged. The device has the advantages that a secondary gradual cooling mode with verticality first and horizontality then is adopted; and the mode utilizes secondary on-line afterheat to treat a uniform phase transformation microstructure, thereby ensuring that the difference of fractographies of finished products is greatly reduced, and effectively improving the toughness property of steel materials.

Description

Two-wire bar split rolling and vertical turning flat subsection cooling device

Technical field:

The utility model relates to a bar material hot rolling cooling device.

Background technique:

At present, in the bar and wire rolling production line, the vertical two-line cutting of the bar adopts the post-rolling controlled cooling fine-grained steel process. The roller device and the frequency conversion conveying roller device are composed of the upper and lower bell mouths, so that the two rods can easily enter the bell mouths one by one and reach the vertical cooling water pipe. The vertical cooling water pipe is a double pipe structure. The water inlet and outlet adopt water-cooling technology to cool the two rods. After the two rods come out of the vertical cooling water pipe, they enter the empty guide groove. The empty guide groove is a single groove structure. Since the two rods go up and down The same bell mouth is subject to gravity, and the height gradually becomes equal in the groove, and it is the same horizontal height from the empty guide groove outlet. Entering the pinch roller device, the pinch roller is driven by power, and is clamped by the upper and lower rollers to give the bar forward movement force, and then the bar enters the frequency conversion conveying roller table device, and the two bars are transferred to the next process.

This kind of bar vertical two-line cutting adopts the post-rolling controlled cooling fine-grained steel process, and only relies on the vertical cooling water pipe for one ultra-rapid cooling to make the temperature of the steel surface to the core increase linearly, and the phase change of the surface layer occurs after cooling to the return temperature. During the process, the phase transition of the core is carried out when the surface layer returns to temperature after cooling. Due to the difference in the phase transition temperature range between the core and the surface layer, there is a large difference in the structure, and even a mixed crystal or Weiss structure appears, and the performance of the finished product fluctuates greatly. , the tensile strength and yield strength ratio Cp are basically at the fourth level, and the stability is difficult to control. In addition, the pass rate of the seismic index is less than 50%.

Invention content:

The purpose of the utility model is to overcome the above-mentioned defects, and provide a cooling device for vertically rotating and horizontally segmenting bars after two-wire split rolling.

The scheme of the utility model is: the feed inlet is two upper and lower bell mouths; the two-line vertical cooler is a double-line cooling water pipe separated up and down corresponding to the outlet height of the two bell mouths; the vertical turning flat guide groove is a double groove structure, The lower trough is a horizontal trough, the entrance of which corresponds to the height of the lower trough of the two-line vertical cooler, the upper trough is an up and down inclined trough, the height of the entrance of the inclined trough corresponds to the height of the upper trough of the two-line vertical cooler, and the height of the outlet corresponds to the height of the vertical cooler. The lower groove of the flat guide trough is separated to the left and right at the same height; the guide pipe is adjacent to the vertical to flat guide trough, and the structure of the guide pipe is a tapered double-box structure, and the exit is close to the pinch roller device; There is a longitudinal partition for separating the two bars; there is a correspondingly connected two-line horizontal cooler behind the frequency conversion conveying roller table. The cooler is a horizontally separated double-tube structure, and the cooler is provided with a water inlet and a water outlet. .

The utility model has the advantages of adopting the second subsection cooling mode of erecting first and then flattening, which utilizes the secondary on-line residual heat to treat the uniform phase transformation structure, so that the difference of the cross-section structure of the finished product is greatly reduced, and the strength and toughness of the steel are effectively improved. Successfully solved the problem of difficult control of the performance stability of finished steel products. At present, the pass rate of the seismic index has reached more than 95%, and the tensile strength and yield strength ratio Cp have been increased by two levels, which greatly reduces the rejection rate of finished products and improves the safety of steel use.

Description of drawings:

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a sectional view along line A-A of Fig. 1 .

Fig. 3 is a B-B sectional view of Fig. 1 .

Fig. 4 is a C-C sectional view of Fig. 1 .

Fig. 5 is a D-D sectional view of Fig. 1 .

Detailed ways:

The utility model comprises a feed inlet (1), a two-line vertical cooler (2), a vertical turning flat guide groove (4), a pinch roller device (6), a frequency conversion conveying roller table, and the feed inlet (1) is There are two upper and lower bell mouths; the two-line vertical cooler (2) is a two-line cooling water pipe separated up and down corresponding to the height of the two bell mouth outlets; the vertical turning flat guide groove (4) is a double groove structure, and the lower groove is a horizontal groove , its entrance corresponds to the height of the lower groove of the two-line vertical cooler (2), the upper groove is an up and down inclined groove, the height of the inlet of the inclined groove corresponds to the height of the upper groove of the two-line vertical cooler (2), and the height of the outlet corresponds to the height of the vertical The left and right lower grooves of the horizontal turning guide groove (4) are arranged at the same height; the guiding pipe (5) is adjacent to the vertical turning flat guiding groove (4). The structure of the guiding pipe (5) is a tapered double box structure, and the outlet is close to the pinch Roller device (6); above the row of rollers of the frequency conversion conveying roller table device (7), there is a longitudinal partition for separating the two bars; behind the frequency conversion conveying roller table, there is a correspondingly connected two-line horizontal cooler (8), The cooler is a horizontally separated double-pipe structure, and a water inlet and a water outlet are arranged in the cooler.

Figure 2 is a two-line vertical cooler (2), which consists of a bracket, upper and lower outer tubes, and a Venturi tube inside the outer tube as the inner tube. The rod passes through the inner tube, and the cooling water flows from the inner tube and the bar flow through the gap.

Fig. 3 is the vertical turning flat guide groove (4). The figure shows that the upper and lower bars extend forward from the upper and lower cavities. The circle with hatching is the current position, and the circle with dotted line is the front position. The two cavities are up and down. The bell mouth shrinks and extends forward to reach the bell mouth position, and the two rods are horizontally separated.

Fig. 4 is guide tube (5), and the inside band section line circle of guide tube (5) is current position, and the band dotted line circle is front position.

Fig. 5 is the two-line horizontal cooler (8) of rear portion, is made up of two outer tubes of support, horizontal separation, and Venturi tube is sheathed in the outer tube.

The two rods enter the two bell mouths from the feed port (1) respectively, and are separated in the two-line vertical cooler (2) to be water-cooled in two turbulent flow tubes, and then enter the vertical rotary flat guide groove (4) for separation Turn flat, then enter the guide pipe (5) to move forward in parallel, realize air cooling at the same time, and then enter the frequency conversion conveying roller table through the pinch roller, separate them by the partition plate on the row roller, and pass through the flattening guide groove and frequency conversion Return to temperature in the conveying roller table to reduce the temperature difference between the surface and core of the bar, then enter the two-line horizontal cooler (8) for water cooling again, and then transport to the cooling bed through the roller table, and return to temperature again during this period to reach the second Secondary on-line waste heat treatment to make the phase transformation structure uniform and the steel performance stable.

In the prior art, the two rods are cooled and returned to temperature once, which affects the uniformity of cooling. Therefore, the utility model adopts secondary segmental cooling and secondary online waste heat treatment during the traveling process of the rods, which not only has a good cooling effect, but also makes the steel surface and the core The temperature is more uniform.

Claims (1)

1. After the two-line split rolling of the bar, the vertical-turn-flat-section cooling device includes the feed inlet (1), the two-line vertical cooler (2), the vertical-turn flat guide groove (4), and the pinch roller device ( 6), the frequency conversion conveying roller table is characterized in that the feed inlet (1) is two upper and lower bell mouths; the two-line vertical cooler (2) is a two-line cooling water pipe separated up and down corresponding to the height of the outlet of the two bell mouths; The vertical turning flat guide groove (4) is a double groove structure, the lower groove is a horizontal groove, and its entrance corresponds to the height of the lower groove of the two-line vertical cooler (2), the upper groove is an up and down inclined groove, and the height of the entrance of the inclined groove is the same as that of the two The upper groove of the line vertical cooler (2) corresponds to the same height, and the outlet height is equal to that of the lower groove of the vertical turning flat guide groove (4). The structure of the guide pipe (5) is a tapered double-box structure, and the exit is close to the pinch roller device (6); a longitudinal partition for separating the two bars is arranged above the roller row of the frequency conversion conveying roller table device (7); A correspondingly connected two-line horizontal cooler (8) is arranged behind the conveying roller table. The cooler is a horizontally separated double-pipe structure, and a water inlet and a water outlet are arranged in the cooler.

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