CN1053375A

CN1053375A - Metal pouring method and equipment thereof

Info

Publication number: CN1053375A
Application number: CN 91100316
Authority: CN
Inventors: 威廉·艾伯特·格里菲思
Original assignee: Flogates Ltd
Current assignee: Flogates Ltd
Priority date: 1990-01-16
Filing date: 1991-01-14
Publication date: 1991-07-31
Also published as: YU5991A; CS8891A2; IE910080A1; WO1991010525A1; GB2246533B; AU7178491A; CA2034235A1; GB2246533A; GB9117659D0; ZW291A1

Abstract

Injected the molten steel of continuous casting mold controls with gate valve 10 by tundish.Gate valve comprises a static fire retarding component 14 and a slip fire retarding component 37 that also has sprue gate 42 with casting of metals mouth 18, sliding component open and closed condition between move, when opening two sprue gates in line, depart from two sprue gates when closing.Make sliding component produce an increment step motion when closing, can prevent that molten steel from condensing at the gate valve place.

Description

Metal pouring method and equipment thereof

The present invention relates to a kind of metal pouring method and equipment thereof.

In continuous casting steel machine for example, the deposite metal flows into a tundish from casting ladle, flows into a continuous casting mold from tundish by gate spool again.

Flow into the flow of the deposite metal of continuous casting mold from tundish, available sliding gate control, this has belonged to common in the art.

Must interrupt if cast, for example when changing gate spool, sliding gate be closed, just the danger that the sliding gate place has metal to condense before the metal that for example uses oxygen lance to condense is removed, will hinder metal to go again and flow through.

No. the 66118th, the European patent of Mei Takang company reduces the danger that metal condenses for asking as far as possible, makes the sliding component of the gate valve in the closed condition produce vibration.

How many this methods perhaps has effect, but under any circumstance, and the rapid vibration of sliding component had adverse effect, and relevant mechanical component is caused wearing and tearing the life-span of sliding component and adjacent fire retarding component thereof.

Purpose of the present invention is to propose a kind of improved method, and at casting of metals operation intercourse, the danger that metal can be condensed minimizes.

The present invention proposes a kind of method of pouring molten metal, control the flow of deposite metal in the method with a gate valve, gate valve comprises a static fire retarding component with casting of metals mouth, with a slip fire retarding component that also has the casting of metals mouth, sliding component can move between the opening and closing state, when opening, the sprue gate of sprue gate and static component in line, depart from mutually at two sprue gates when closing; It is characterized in that when sliding part is in closed condition, make sliding part make the increment step motion, condense with the deposite metal that prevents the gate valve place.

Each step level of increment step motion for example is 0.5 to 10mm, is preferably 0.5 to 2mm; The time of staying of the step inter-stage of incremental motion for example is between 0.5 to 2 second; The step level elapsed-time standards of each incremental motion for example is no more than 0.5 second.

The speed of each step level for example is 5-100mm/ second, can be 5-20mm/ second.

The ratio of the time of staying and incremental motion time for example is between 20: 1 to 5: 1.

The present invention also proposes a kind of method, wherein, in the closed condition of gate valve, sliding component can move between second closed position of one first closed position and a terminal point, in the time of on first closed position, just depart from mutually at two sprue gates, in the time of on second closed position, further depart from two sprue gates, and sliding component is made the increment step motion continuously between first and second closed position.

Distance between first and second closed positions for example is 20 to 100mm, can be 25 to 85mm.

The increment step motion can be from first to second closed position, gets back to the unidirectional of first closed position again from second closed position and moves.But, the increment step motion also can be on the total direction of motion if in the circulation of the less reverse step level of step level and number subsequently.

For example, 2 to 7 step levels on total moving direction are arranged, replace with 1 to 4 reverse step level; Can be to have 3 to 5 step level and reverse step levels on total moving direction to replace, and a reverse step level is bigger than the distance of a forward step level, but total moving direction be constant.

The present invention also proposes a kind of the present invention of having structure, and can implement the equipment of the inventive method, and it comprises a sliding gate, comprising: (a) have the static fire retarding component of casting of metals mouth; (b) also has the slip fire retarding component of casting of metals mouth; (c) device that sliding component is moved between open mode and closed condition makes sliding component sprue gate and static component sprue gate in line when opening, and two cast gates depart from when closing; (d) make the device of sliding component increment step motion in off position.

Be about implementing the explanation of method and apparatus of the present invention, should reading below with reference to accompanying drawing.This explanation does not provide constraints to invention only as an example.

The accompanying drawing drawing is described as follows:

Fig. 1 demonstration is in the gate valve of open mode, and generally shows actuating and control device of gate valve;

Fig. 2 shows the gate valve that is in closed condition, and just depart from static sprue gate at its sprue gate;

Fig. 3 shows same gate valve in the closed position, but its sprue gate and static sprue gate more away from;

Fig. 4 shows the curve map of a duty implementing equipment of the present invention;

Fig. 5 shows the curve map of another duty.

Implement equipment of the present invention and comprise a gate valve 10, from the flow of tundish (not shown) by the molten steel of a gate spool (not shown) inflow continuous casting mold, this has belonged to common in the art in order to control.

Gate valve 10 comprises a static top board sub-assembly, is installed on the bottom of tundish.The top board sub-assembly has a refractory slab 14, and metallic cover is used in its part 16, also has a fire-resistant inserts 17, which is provided with static sprue gate 18.Gate valve 10 also comprises the static base plate sub-assembly 20 of a complementation, and it has refractory slab 22, metal coating 24, fire-resistant inserts 26 and static sprue gate 28.The fire-resistant pouring mouth spare 30 of a metallic cover, it is installed on the base plate sub-assembly 20, has axial hole 32; Pouring mouth spare 30 stretches in the upper end of gate spool (not shown).Sprue

gate

18,28 and hole 32 are in the axial direction in line.

Be provided with a slide assemblies 34, in order between two relative

refractory surfaces

36,38 of top,

base plate sub-assembly

12,20, to slide.Slide assemblies 34 has the fire-resistant inserts 40 that 37, one of refractory slabs that coat with endless metal coating 39 are provided with sprue gate 42.

Implementing the fluid power that equipment of the present invention also comprises gate valve 10 actuates and control device 44.This device has a piston 46, is installed in the hydraulic cylinder 48, and mat piston rod 50 is connected with slide assemblies 34.Hydraulic cylinder 48 links to each other with hydraulic supply unit 52 by fluid pressure line 54.During equipment operation, pressure oil is supplied with by pipeline 54 from hydraulic supply unit, and piston 46 is moved in hydraulic cylinder 48, by piston rod 50, slide assemblies 34 is moved again.

Hydraulic supply unit 52 is by 55 controls of a microprocessor, and microprocessor is by software 56 controls.

During equipment operation, slide assemblies 34 moves between the open mode of Fig. 1 and the closed condition in Fig. 2 and 3, when opening, sprue gate 42 and sprue

gate

18 and 28 are in line,

sprue gate

18,42,28 and hole 32 can be passed through from tundish in the deposite metal, and then inject continuous casting mold by gate spool; When closing, depart from mouth 18 at sprue gate 42, cuts off deposite metal stream.

Fig. 2 illustrates first closed position of slide assemblies 34, at this moment sprue gate 42 just and sprue gate 18 depart from; Fig. 3 illustrates second closed position of a terminal point, and at this moment further depart from sprue gate 18 at sprue gate 42.When slide assemblies 34 moves on to closed condition and when casting is paused, keep slide assemblies 34 between first closed position and second closed position, to move, with with the gate valve place, the danger of condensing of the metal between surface 36 and the slide assemblies 34 degree that minimizes especially.

For this reason, come by hydraulic supply unit 52 and hydraulic cylinder 48, to make slide assemblies 34 make the increment step motion with software 56 to microprocessor 55 programmings.

The example of increment step motion, the 1mm incremental step level under the constant speed of 10mm/ second (being per 0.1 second 1mm) for example alternated with time of staying in 1 second.

The full stroke of gate valve 10 is the axis A from static sprue gate 18, arrives the axis B at the sprue gate 42 in final position as shown in Figure 3.When for example the diameter at sprue gate 42 was 35mm, this distance was 120mm.Therefore, the stroke between first and second position shown in Fig. 2 and 3 is 85mm, but the second place that can regulate terminal point is reduced to this stroke less than full stroke.Moreover, can make the corresponding increase and decrease of stroke in the time of will pouring into a mould the bore increase and decrease.Be appreciated that the stroke when between first and second closed position is 85mm, the incremental step level be per 0.1 second 1mm, the time of staying is when being 1 second, the position that the position arrives Fig. 3 from Fig. 2 takes 93.5 seconds.If be enough to make cast to recover during this period of time, then slide assemblies 34 can be got back to its open mode (Fig. 1) rapidly from the final position of Fig. 3, if perhaps before reaching the second place equipment can use, then reality is got back to open position from a certain centre position.As on the contrary, the second place has reached and equipment does not reach as yet and recovers cast, then increment stepping reversing of motion operation, and when reaching the position of Fig. 2 again, then can be again to the reversion of the position of Fig. 3.

Fig. 4 illustrates a forward stroke and the retrograde stroke in the one embodiment of this invention, its increment step motion be from primary importance to the second place, and return the unidirectional of primary importance from the second place and move.Transverse axis is represented the time, and the longitudinal axis is represented distance; So increment is represented by the vertical line of each step level and the horizontal line of the time of staying.

Yet, may not need to do omnidistance operation, can be that step motion is confined near in the zone of Fig. 2 position with increasing, hotter in this zone towards slide assemblies 34, thus the chance that the generation metal condenses is less.

Fig. 5 illustrates a forward stroke and the contrary stroke in the one embodiment of this invention, increment step motion between its first and second position, betide in three step levels of order on total moving direction, a reverse step level is followed in the back, as shown in Figure 5, its length (distance) can be the twice of forward step level.

Claims

1, a kind of deposite metal pouring procedure, its deposite metal flow is controlled by a gate valve, this gate valve comprises a static fire retarding component with casting of metals mouth, with a slip fire retarding component that the casting of metals mouth is arranged equally, sliding component can move between open mode and closed condition, when opening the sprue gate of sprue gate and static element in line, depart from two sprue gates when closing; It is characterized in that when sliding component is in closed condition, apply an increment step motion, condense with the deposite metal that prevents the gate valve place to sliding component.

2, method according to claim 1, the step level that it is characterized in that incremental motion are 0.5 to 10mm, can be 0.5 to 2mm.

3, method according to claim 1 and 2, the time of staying that it is characterized in that the step inter-stage of incremental motion is 0.5 to 2 second.

4, according to each described method in the aforementioned claim, it is characterized in that each step level of increment step motion, elapsed-time standards is no more than 0.5 second.

5, according to each described method in the aforementioned claim, the ratio that it is characterized in that the time of the time of staying and incremental motion is 20: 1 to 5: 1.

6,, it is characterized in that the speed of each step level of incremental motion is 5-100mm/ second, for example 5-20mm/ second according to each described method in the aforementioned claim.

7, according to each described method in the aforementioned claim, when it is characterized in that gate valve is in closed condition, sliding part can move between second closed position of first closed position and terminal point, just depart from two sprue gates when first closed position, depart from more at two sprue gates when the second place, and sliding component moves continuously with the increment step motion between first and second position.

8, method according to claim 7 when it is characterized in that sliding component in off position, is carried out two strokes at most, and one is from the primary importance to the second place, and another is to get back to primary importance from the second place.

9, method according to claim 7 is characterized in that carrying out when sliding component is in off position more than two stroke, one from primary importance to the second place, another turns back to primary importance.

10,, it is characterized in that the second place of terminal point can be regulated according to each described method in the claim 7,8 and 9.

11,, it is characterized in that distance between first and second position is 20 to 100mm according to appointing a described method in the claim 7 to 10.

12,, it is characterized in that the increment step motion for from first to the second place, and turn back to the unidirectional of primary importance from the second place and move according to each described method in the claim 7 to 11.

13, as each described method in the claim 7 to 11, it is characterized in that the increment step motion between first and second position, is the some step levels on total moving direction, the retrograde circulation that go on foot level less with the number of following thereafter.

14, method according to claim 13 is characterized in that 2 to 7 on total moving direction go on foot level, replaces with 1 to 4 step level of driving in the wrong direction.

15, according to claim 13 or 14 described methods, the distance that it is characterized in that reverse step level is greater than the forward step level.

16, according to each described method in the aforementioned claim, it is characterized in that metal is a steel, gate valve is installed on the tundish, to control molten steel from the flow of tundish to continuous casting mold.

17, implement the equipment of each described method in the aforementioned claim, it comprises a gate valve, and this gate valve comprises:

(a) static fire retarding component with casting of metals mouth;

(b) slip fire retarding component that has the casting of metals mouth equally;

(c) device that sliding component is moved between open mode and closed condition, when opening, the sprue gate of its sprue gate and static element in line, depart from two sprue gates when closing;

(d) sliding component is made the device of increment step motion in off position.

18, equipment according to claim 17 is characterized in that also comprising a tundish and the continuous casting mold that gate valve is housed, and gate valve is used to control the flow that injects the deposite metal of continuous casting mold from tundish.