TWI462783B - Steel surface rusting device - Google Patents

Description

Steel embryo surface descaling device

The present invention relates to a metal surface processing apparatus, and more particularly to a steel surface descaling apparatus.

The steel embryo continuous casting machine is a process equipment for improving the yield, quality and economic benefit of the steel embryo. FIG. 1 shows a schematic structural view of a conventional steel preform continuous casting machine. As shown in FIG. 1, the conventional steel continuous casting machine 10 mainly comprises a ladle 11 , a molten steel distributor 12 , a copper mold cooling zone 13 , a casting channel cooling zone 14 , a straightening unit 15 and a flame cutting machine. Unit 16, the steel embryo production process is that molten steel is injected into the molten steel distributor 12 from the bottom of the ladle 11 and distributed to the copper mold cooling zone 13 to form an initial crust in the mold; the steel embryo leaves the copper After the mold cooling zone 13, the mold cooling zone 14 is entered, and solidified by spray water cooling in the casting lane; after that, the steel blank is straightened through the straightening unit 15; finally, the steel blank is taken by the flame cutting unit 16. Divided into large steel knuckles.

However, the surface of the steel embryo produced by the conventional steel continuous casting machine 10 produces a lot of scales, and before the large steel blank is rolled, the surface scales are easily peeled off, so that they are rolled into small steel embryos or During the finished line process, the scale is rolled into the finished surface at the same time, which causes the surface defects of the finished product. When the small steel blank has surface defects, it is usually necessary to remove the surface defects through a subsequent grinding process. However, the defect grinding system causes the steel loss and the yield of the steel. In addition, because the cooling rate of the subsequent process of the steel continuous casting machine 10 is not good, the surface layer of the steel embryo tends to form iron crystal grains, resulting in grain coarsening and quality degradation of the steel surface.

In view of this, it is necessary to provide an innovative and progressive steel surface descaling device to solve the above problems.

The invention provides a steel blast surface descaling device, which is installed on a steel blast continuous casting machine, which has a straightening unit and a flame cutting unit, and the steel blast surface descaling device is used for Surface rust removal is performed on a steel embryo, and the steel surface descaling device is disposed between the straightening unit and the flame cutting unit, the steel surface rust removing device comprises: a support frame, which is erected on the straightening Between the unit and the flame cutting unit; a plurality of atomizers are mounted on the support frame, each of the sprayers having at least one atomizing nozzle, each of the atomizing nozzles being disposed obliquely and facing the steel embryo; A water gas volume distributor has a plurality of water and gas pipelines, each of which is connected to each of the atomizers.

The invention removes the surface of the steel embryo by using a strong water mist sprayed by the atomizing nozzle with a special spray angle before the steel blank is straightened and not flame cut, so as to reduce the scale of the scale being rolled into the surface of the small steel blank. The probability of defects, which in turn reduces the grinding loss rate of the steel blank and increases the yield. In addition, the strong water spray sprayed by the atomizing nozzle can accelerate the cooling of the steel embryo to suppress the growth of the iron crystal grain and generate an equiaxed fine crystal structure on the surface layer of the steel embryo, thereby improving the quality of the steel blank product.

Please refer to FIG. 2 and FIG. 3 , which are respectively a schematic view showing the position of the steel embryo surface descaling device of the present invention installed in a steel embryo continuous casting machine and a schematic structural view thereof. The steel surface descaling device 20 of the present invention is installed on a steel continuous casting machine 10 having a straightening unit 15 and a flame cutting unit 16, and the surface of the steel is derusted. The apparatus 20 is configured to perform surface descaling of a steel blank 30, and the steel surface descaling device 20 is disposed between the straightening unit 15 and the flame cutting unit 16, and in the embodiment, the straightening unit 15 A casting path 40 is disposed between the flame cutting unit 16 and the steel blank 30 is located in the casting path 40.

Fig. 4 is a perspective view showing the structure of the steel blast surface descaling apparatus of the present invention. Referring to FIG. 3 and FIG. 4 , the steel surface descaling device 20 includes a support frame 21 , a plurality of sprayers 22 , and a water vapor distributor 23 . The support frame 21 is mounted on the straightening unit 15 and the same. The flame cutting unit 16 has an upper crossbar 211, a lower crossbar 212, a first side bar 213 and a second side bar 214. The second side bar 214 is disposed opposite to the first side bar 213. In this embodiment, the upper cross bar 211, the lower cross bar 212, the first side bar 213, and the second side bar 214 are respectively Located around the casting path 40.

The sprayers 22 are mounted on the support frame 21. In the embodiment, the sprayers 22 are respectively mounted on the upper crossbar 211, the lower crossbar 212, the first side bar 213, and the first The two side rods 214, and each of the atomizers 22 have at least one atomizing nozzle 221. In the present embodiment, each of the atomizing nozzles 221 is disposed obliquely and faces the steel blank 30. In addition, in order to increase the rust removing effect of the present invention, each of the atomizing nozzles 221 needs to have a special spraying angle. Therefore, each of the atomizing nozzles 221 and the steel blank 30 has an angle θ and a spacing G. In an embodiment, the angle θ is between 5° and 50°, preferably, the angle θ is 15°, and the spacing G is between 10 mm and 100 mm to ensure the steel embryo. 30 does not collide with each of the atomizing nozzles 221.

Referring to FIG. 3 and FIG. 4, the water vapor distributor 23 has a plurality of water and gas pipelines 231, each of which is connected to each of the sprayers 22. In this embodiment, in order to make each of the sprayers 22 Each of the atomizing nozzles 221 can spray a strong water mist, and the static pressure of the compressed air in each of the water and gas lines 231 needs to be greater than 3 kg/cm ² .

Fig. 5 is a view showing the operation of the steel rust removing device of the present invention. Referring to FIG. 3 and FIG. 5, when the steel blank 30 is transported to the position corresponding to the steel surface descaling device 20, each of the atomizing nozzles 221 of each of the atomizers 22 will spray a strong water mist to The surface scale of the steel blank 30 is removed, and the effect is not only to reduce the probability of the scale being rolled into the surface of the small steel blank, but also to reduce the grinding loss rate and the output rate of the steel blank 30. In addition, the strong water mist sprayed by each of the atomizing nozzles 221 can accelerate the cooling of the steel blank 30 to suppress the growth of the iron crystal grains, and generate an equiaxed fine crystal structure on the surface layer of the steel blank 30, thereby improving the finished steel product. Quality.

In order to verify the actual descaling effect of the present invention, the carbon steel SAE1010AK was subjected to a derusting test by a single group of sprayers 22, and the low alloy steel SCM435H was subjected to a derusting test by four sets of atomizers 22. The test results are shown in Table 1 and Table 2 shows.

After three batches of descaling tests on the carbon steel SAE1010AK-non-burning embryo-the same grinding grade with a single set of sprayers 22, the results (Table 1) demonstrate that the grinding time per steel embryo is reduced and the relative yield of the steel embryos is produced. The loss factor (with rust removal time/non-rust removal grinding time) averages 0.61, which also reduces the amount of grinding loss by 39%.

When four sets of sprayers 22 were used to compare the low-alloy steel SCM435H in the same furnace, the results (Table 2) also showed that the grinding time of each steel mill was reduced, and the relative loss coefficient of the produced steel embryos was on average. 0.72 can also reduce the amount of grinding loss by 28%.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the scope of the present invention. The scope of the invention should be as set forth in the appended claims.

10. . . Steel embryo continuous casting machine

11. . . Sheng Steel Barrel

12. . . Liquid steel distributor

13. . . Copper mold cooling zone

14. . . Casting cooling zone

15. . . Straightening unit

16. . . Flame cutting unit

20. . . Steel embryo surface descaling device

twenty one. . . Support frame

twenty two. . . sprayer

twenty three. . . Water gas distributor

30. . . Steel embryo

40. . . Casting

211. . . Upper rail

212. . . Lower crossbar

213. . . First side rod

214. . . Second side bar

221. . . Atomizing nozzle

231. . . Water gas pipeline

G. . . spacing

θ. . . angle

Figure 1 is a schematic view showing the structure of a conventional steel preform continuous casting machine;

2 is a schematic view showing the position of the steel blast surface descaling device of the present invention installed in a steel preform continuous casting machine;

Figure 3 is a schematic view showing the structure of the steel rust removing device of the present invention;

Figure 4 is a perspective view showing the structure of the steel rust removing device of the present invention; and

Fig. 5 is a view showing the operation of the steel rust removing device of the present invention.

20. . . Steel embryo surface descaling device

twenty one. . . Support frame

twenty two. . . sprayer

twenty three. . . Water gas distributor

40. . . Casting

211. . . Upper rail

212. . . Lower crossbar

213. . . First side rod

214. . . Second side bar

221. . . Atomizing nozzle

231. . . Water gas pipeline

Claims (5)

A steel embryo surface descaling device is installed on a steel embryo continuous casting machine, the steel embryo continuous casting machine has a straightening unit and a flame cutting unit, and the steel surface surface descaling device is used for a steel embryo Performing surface descaling, and the steel surface descaling device is disposed between the straightening unit and the flame cutting unit, the steel surface descaling device includes: a support frame that is erected on the straightening unit and the flame Between the cutting units, the support frame has an upper cross bar, a lower cross bar, a first side bar and a second side bar, the second side bar is opposite to the first side bar; a plurality of sprayers, The sprayer has at least one atomizing nozzle, and each of the atomizing nozzles is inclined. The sprayer has the upper crossbar, the lower crossbar, the first sidebar and the second sidebar. And disposed toward the steel embryo; and a water vapor dispenser having a plurality of water and gas pipelines, each of the water and gas pipelines connecting the sprayers. The steel blast surface descaling device of claim 1, wherein each of the atomizing nozzles and the steel blast has a spacing between 10 mm and 100 mm. The blasting surface descaling device of claim 1, wherein each of the atomizing nozzles has an angle with the steel embryo, and the angle is between 5° and 50°. The steel blast surface descaling device of claim 3, wherein the angle is 15°. The steel blast surface descaling device of claim 1, wherein the compressed air static pressure in each of the water gas lines is greater than 3 kg/cm ² .