TW201822914A - Flow guiding brick including wavelet grooves for optimizing the casting quality of steel liquid - Google Patents

Abstract

A flow guiding brick surrounds a flow guiding space having an opening facing upward, and includes a top surface surrounding the opening, a surrounding surface connecting with the top surface and surrounding the flow guiding space, and a bottom surface connecting with the surrounding surface and away from one side of the top surface and located at the bottom of the flow guiding space; the bottom surface has two bottom slanting portions respectively extending obliquely upward from opposite sides of a bottom line extending in a first direction, and a plurality of wavelet grooves formed on the bottom slanting portions and having a concave shape. The surrounding surface has a first section extending obliquely downward from the top surface toward the flow guiding space, and a second section extending obliquely upward from the bottom surface toward the flow guiding space. By the configuration of the flow guiding space surrounded by the flow guiding brick, the flow field type of the molten steel can be changed to optimize the casting quality in association with wavelet grooves.

Description

Diversion brick

The invention relates to an auxiliary device for guiding molten steel injection into a distributor, in particular to a guide brick.

Referring to FIG. 1, an existing molten steel distributor 1 communicates with a relatively upstream injection device 2 and includes a housing 11 surrounding a space 100 having an opening 101 and an openable closure of the opening. A cover body 101 and a plurality of partition plates 13 provided in the space 100. The injection device 2 has an injection port 200 facing the space 100, and the molten steel is injected into the space 100 through the injection port 200. The casing 11 includes a guide brick 111 embedded in the bottom and located below the injection port 200, and a nozzle nozzle 112 penetrating the bottom and spaced from the guide brick 111 at least a distance.

The injection device 2 injects the molten steel in the space 100 through the injection port 200, and first directly flows downward to contact the guide brick 111, and the molten steel changes the flow behavior through the guide brick 111 in the space 100. The flowing molten steel, through the blocking of the partition plates 13, can reduce the flow velocity of the liquid surface of the molten steel, reduce the probability of slag rolling, and thereby increase the residence time of the molten steel in the space 100, effectively improving Removal rate of molten steel intermediary on the float.

Therefore, in order to optimize the above-mentioned efficacy as much as possible, the guide brick 111 must mainly consume the kinetic energy of the downward impact of molten steel when injected from the injection port 200, thereby reducing the probability of generating an upward flow field after the impact; The molten steel is caused to recirculate to extend the residence time of the molten steel in the space.

Therefore, an object of the present invention is to provide a guide brick capable of consuming the kinetic energy of the molten steel's downward impact and capable of causing the molten steel to return.

Thus, the diversion brick of the present invention surrounds a diversion space with an upwardly facing opening, and includes a top surface surrounding the opening, a surrounding surface connected to the top surface and surrounding the diversion space, and A bottom surface is connected to one side of the surrounding surface away from the top surface and is located at the bottom of the diversion space.

The bottom surface has two bottom slopes extending obliquely upward from both sides of a bottom line extending in a first direction, and a plurality of concave wave-cutting grooves formed on the bottom slopes. The surrounding mask has a first section extending obliquely downward from the top surface toward the diversion space, and a second section extending obliquely upward from the bottom surface toward the diversion space.

The effect of the invention is that after the molten steel is injected into the diversion space surrounded by the surrounding surface and the bottom surface, the kinetic energy of the downward impact of the molten steel can be consumed by the wave-cutting grooves first, thereby reducing the upward flow field strength of the molten steel. Then, by bending the second section and the first section, the molten steel is caused to flow back in the diversion space, so as to increase the residence time of the molten steel injected therein, so that the molten steel flows in the distributor. The field energy presents a pattern favorable to casting, thereby optimizing the quality of casting.

Referring to FIG. 2, an embodiment of the diversion brick 3 of the present invention surrounds a diversion space 300 having an opening 301 facing upward, and includes a top surface 31 surrounding the opening 301 and a top surface 31 connected to the top surface 31. A surrounding surface 32 surrounding the flow guiding space 300 and a bottom surface 33 connected to one side of the surrounding surface 32 away from the top surface 31 and located at the bottom of the flow guiding space 300. Among them, the preferred size of this embodiment is 136 cm in length, 112 cm in width, and 30 cm in height, but it can also be adjusted appropriately in actual design.

Referring to FIGS. 2 and 3, the bottom surface 33 has two bottom inclined portions 331 extending obliquely upward from both sides of a bottom line L extending in a first direction, and most of the bottom inclined portions 331 are formed on the bottom inclined portions 331. A concave wave-cutting groove 332. Each of the wave-cutting grooves 332 is a circular groove, and preferably has a diameter of 80 mm.

The surrounding surface 32 has a first section 321 extending obliquely downward from the top surface 31 toward the diversion space 300, a second section 322 extending obliquely upward from the bottom surface 33 toward the diversion space 300, and a connection between The connecting section 323 between the first section 321 and the second section 322. The first section 321 of the surrounding surface 32 and the top surface 31 form a first included angle a1, and the second section 322 of the surrounding surface 32 and the bottom surface 33 form a second included angle a2 which is away from the bottom line L. The second included angle a2 is preferably 53 degrees.

Referring to FIG. 4, this embodiment is used with a dispenser 4 surrounding a distribution space 40 and a long nozzle 5 communicating with the distribution space 40, and the embodiment is embedded in the dispenser 40 bottom. The molten steel injected into the distribution space 40 from the long injection nozzle 5 will first be directly injected downward into the diversion space 300 of this embodiment. After the molten steel is injected into the diversion space 300, it will first contact the wave-cutting grooves 332 formed in the bottom inclined portions 331. When the molten steel injected into the diversion space 300 gradually increases, the molten steel will first The second section 322 contacting the surrounding surface 32 is then affected by the bending pattern of the surrounding surface 32 in the flow guiding space 300, and thus a backflow occurs.

Referring to FIG. 5 and in conjunction with FIG. 3 and FIG. 4, FIG. 5 shows a flow field pattern of the molten steel injected into the diversion space 300 of this embodiment. Each white line represents the molten steel as multiple particles. A simulated moving line formed by simulating the moving direction of these particles. It can be known from FIG. 5 that after contacting the wave-cutting grooves 332, the molten steel flows laterally along the bottom inclined portions 331, which is less likely to generate an upward movement, so the surface flow velocity in the distribution space 40 can be made. Lowering can reduce the surface slag rolling. When the molten steel gradually flows laterally and contacts the second section 322 of the surrounding surface 32, it will be affected by the second included angle a2. Therefore, the bottom slopes 331 and the second section 322 of the surrounding surface 32 will be affected. An obvious backflow is formed therebetween, so that the time during which the molten steel stays in the diversion space 300 can be effectively improved.

Table I:

Referring to Table 1 above, the flow field is carried out by actually targeting the situation of non-diversion bricks, with traditional diversion bricks, with diversion bricks 3 of the present invention but without wave-cutting groove 332, and with diversion bricks 3 of the present invention. Measurement of simulated data to show the efficacy of the diversion brick 3 of the present invention. Table 1 measures the minimum dwell time, column flow volume ratio, retention volume ratio, and Peckley's inverse number, where the minimum dwell time represents the time when the molten steel enters the diversion space 300 to the direction from the diversion space 300. The shortest time of external overflow; the column flow volume ratio represents the proportion of areas where there is no relative movement between the parts when the molten steel flows as a whole; and the retention volume ratio represents the occurrence of backflow and stagnation when the molten steel flows as a whole. proportion.

For the purpose of optimizing the casting quality, if the intermediaries in the molten steel can be effectively floated, it will be beneficial to the cleanliness of the molten steel, so that the cast product will not contain intermediaries, and the quality of the product is of course Followed up. The representative meaning of each parameter is further discussed. As the minimum dwell time is longer, the chance that the medium can float upwards is of course more; when the volumetric rate of the columnar flow is high, the state of the medium in the injection zone is stationary with the molten steel. At the same time, it is easy to float freely; if the retention volume rate is low, it means that the molten steel is less likely to stop flowing in the same area, except that it will not undergo secondary oxidation with the gas penetrating into the molten steel and produce intervening Objects can also make intervening objects flow and float more easily.

As shown in the data in Table 1, it can be clearly seen that when using the diversion brick 3 of the present invention (without absorbing groove 332), compared with non-diversion bricks and traditional diversion bricks, the minimum residence time is significantly improved and the residence volume is significantly increased. The rate liquid is effectively increased, and the retention volume ratio is significantly reduced, so it is indeed possible to increase the chance of floating on the substance. Continuing to refer to the data using the deflector tile 3 (with the wave-cutting groove 332) of the present invention, compared with the data of the deflector tile 3 (without the wave-cutting groove 332) of the present invention, the effect is improved again.

It is worth noting that the Peckley inverse is a dimensionless parameter used to express the ratio of the convection rate to the diffusion rate. It can directly reflect the relative situation of convection and diffusion with numerical values. For the purpose of the present invention, Peck The higher the Raiders number, the lower the Peckle's inverse number, means that the convection situation is strong, and the diffusion behavior is relatively weak, which can make the intermediary have more opportunities to float. Therefore, by directly referring to the values of the Peckley inverse number in Table 1, the substantial effect of the diversion brick 3 of the present invention can be reflected.

In summary, the wave-cutting grooves 332 of the guide brick 3 of the present invention can consume the kinetic energy of the downward impact of molten steel, reduce the upward flow field strength of the molten steel injected, and reduce the chance of slagging. The bent shape of the second section 322 and the first section 321 causes the molten steel to flow back in the diversion space 300, so as to increase the residence time of the molten steel injected therein, so that the molten steel is interposed therebetween. The material effectively floats and can effectively optimize the quality of casting, so it can indeed achieve the purpose of cost invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited in this way, any simple equivalent changes and modifications made in accordance with the scope of the patent application and the content of the patent specification of the present invention are still Within the scope of the invention patent.

3‧‧‧Diversion brick

300‧‧‧ diversion space

301‧‧‧ opening

31‧‧‧Top

32‧‧‧surrounding surface

321‧‧‧first paragraph

322‧‧‧paragraph 2

323‧‧‧Conjunction

33‧‧‧ underside

331‧‧‧ bottom slope

332‧‧‧Wave

4‧‧‧Distributor

40‧‧‧Allocate space

5‧‧‧long nozzle

a1‧‧‧First angle

a2‧‧‧Second angle

L‧‧‧ bottom line

Other features and effects of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a partial cross-sectional view illustrating a conventional molten steel distributor; FIG. 2 is a perspective view illustrating a guide of the present invention; An embodiment of a stream brick; Figure 3 is a cross-sectional view illustrating the internal structure of the embodiment; Figure 4 is a schematic diagram illustrating the use of the embodiment; and Figure 5 is a first-class field simulation diagram illustrating the effectiveness of the embodiment .

Claims (6)

A diversion brick surrounds a diversion space with an opening facing upward, and includes a top surface surrounding the opening, a surrounding surface connected to the top surface and surrounding the diversion space, and a connecting surface. The surrounding surface is far from one side of the top surface and is located at the bottom surface of the bottom of the diversion space; the bottom surface has two bottom inclined portions extending obliquely upward from both sides of a bottom line extending in a first direction, and most A concave wave-cutting groove formed on the bottom slopes, the surrounding mask has a first section that extends obliquely downward from the top surface toward the diversion space, and a bottom surface facing the diversion space. The second paragraph extends upwards. The diversion brick according to claim 1, wherein a first angle between the first section of the surrounding surface and the top surface, and a second section of the surrounding surface and a side of the bottom surface away from the bottom line Two included angles, the second included angle is between 50 and 55 degrees. The diversion brick according to claim 2, wherein the second included angle is 53 degrees. The diversion brick according to claim 1, wherein the surrounding surface further has a connecting section connected between the first section and the second section. The guide brick according to claim 1, wherein each of the wave-cutting grooves is a circular groove. The guide brick according to claim 5, wherein a diameter of each of the wave-cutting grooves is 80 mm.