CN204366001U - A kind of air pressure fills the semi-continuous casting device of type - Google Patents
A kind of air pressure fills the semi-continuous casting device of type Download PDFInfo
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- CN204366001U CN204366001U CN201420766092.XU CN201420766092U CN204366001U CN 204366001 U CN204366001 U CN 204366001U CN 201420766092 U CN201420766092 U CN 201420766092U CN 204366001 U CN204366001 U CN 204366001U
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Abstract
The utility model discloses the semi-continuous casting device that a kind of air pressure fills type, comprise tundish, guiding gutter, plunger rod, water runner and crystallizer, tundish side arranges guiding gutter, the interface of guiding gutter and tundish arranges plunger rod, be connected by watering runner between tundish with crystallizer, the exit of watering runner forms liquid cave; Tundish is sealed construction, and tundish top external gas pressure control system.Its method waters runner by arranging between tundish and crystallizer, and control to water the flow velocity of runner exit place metal bath, the convection effects of reinforced metal melt in liquid cave and stirring action, thus the crystal in refinement ingot casting.The utility model can reach and make ingot structure and uniform composition, the thick column crystal of elimination, the object that forms the tiny equiax crystal of crystal grain, suppress macro-components segregation in ingot casting.
Description
Technical field
The utility model relates to metal material moulding technical field, and particularly a kind of air pressure fills the semi-continuous casting device of type.
Background technology
Semi-continuous casting is a kind of important means preparing metal material ingot casting, is widely applied in non-ferrous alloy work field.But for the copper alloy (as adonic etc.) that some crystallization ranges are wide, be easy to produce thick column crystal and serious macro-components segregation in the semi-continuous casting process of large gauge ingot casting.A large amount of production practices show, strengthen the Melt Stirring in liquid cave, crystallizer region in semi-continuous casting process, are the effective ways suppressing thick column crystal and macro-components segregation.
For forced fluid cave district Melt Stirring, both at home and abroad on the basis of traditional semi-continuous casting method, in succession develop some new casting method and devices.As: publication number be US 4612970 application discloses that a kind of continuous casting equipment, involving vibrations mould, die lifting platform, fixed frame and guiding device, swing die is utilized to strengthen Melt Stirring, but the leaf springs in this equipment must have suitable mechanical parameter to bear the inertia of die assembly, technical difficulty is large, wayward, mixing effect is limited; Application number is a kind of casting device disclosed in 201210143369.9 and casting method, utilizes Vltrasonic device to carry out Melt Stirring, can refinement ingot casting crystal grain, but ul-trasonic irradiation is limited in scope, and can not solve the problems such as large gauge ingot casting coarse grains and component segregation; Japanese Laid-Open Patent Publication 63-188461 publication and Japanese Laid-Open Patent Publication 60-44157 publication individually disclose the continuous casting apparatus utilizing electromagnetic agitation, have certain grain refining effect; Application number is the height-oriented all even and fine brilliant manufacture method of the continuous casting disclosed in 201310443606.8 and device, propose and a kind ofly cast the method and preparation facilities of preparing the even fine grained texture of orientation continuously, also electromagnetic braking and electromagnetic agitating technology is applied, but because these class methods need configure solenoid near high-temperature fusant place, not only need cooling coil, and power consumption is large, particularly device is complicated, and maintenance difficulties is large; Application number be JP 0213765 application discloses that the method and apparatus regulating metal bath surface in a kind of continuous casting of metal process, its cardinal principle is according to required liquid level and the actual result measured liquid level and compare, regulate arresting lever position, liquid level gauging single inductosyn or optical pickocff carry out, but the method and device can not ensure the constant flow rate of molten metal in exit, and velocity of flow adjust is limited in scope; Publication number is the casting method disclosed in the application of US 4315538 and US 5279353 and device, utilize the own wt of molten metal to stir the molten metal in liquid cave respectively, structure is simple, but the pressure produced owing to utilizing gravity is both non-constant also uncontrollable, its mixing effect is very limited.
Strengthen in the research of crystal region Melt Stirring from semi-continuous casting process, above-mentioned prior art exists following not enough:
(1) when adopting the method for vibration, vibrating device more complicated, and vibration causes the effect of grain refinement very limited.
(2) when adopting electromagnetic agitation or ultrasonic wave to stir, its apparatus structure is complicated, cost of equipment maintenance is very high, and grain refining effect is limited, particularly for the ingot casting of large gauge or the larger alloy of proportion, desirable mixing effect be reached, need to increase substantially electromagnetic field intensity or hyperacoustic power, cause equipment investment cost significantly to rise, technical difficulty significantly strengthens.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of air pressure is provided to fill the semi-continuous casting device of type, this principle of device is simple, but can reach and make ingot structure and uniform composition, the thick column crystal of elimination, the object that forms the tiny equiax crystal of crystal grain, suppress macro-components segregation in ingot casting.
The technical solution of the utility model is: a kind of air pressure fills the semi-continuous casting device of type, comprise tundish, guiding gutter, plunger rod, water runner and crystallizer, tundish side arranges guiding gutter, the interface of guiding gutter and tundish arranges plunger rod, be connected by watering runner between tundish with crystallizer, the exit of watering runner forms liquid cave; Tundish is sealed construction, and tundish top external gas pressure control system.
The described runner that waters is circular tube shaped runner, the top of watering runner communicates with tundish, and the bottom of watering runner is positioned at crystallizer, waters the bottom end face sealing of runner, water near bottom end face multiple openings runner sidewall had as watering runner exit, each opening is obliquely installed.By the setting of each hatch frame, the metal bath from watering runner outflow is made to have multidirectional convection action to the metal bath in liquid cave, thus the convection current of aggravation metal bath and stirring action, the thermograde be conducive in liquid cave reduces, aggravate washing away of crystalline structure simultaneously, impel it to come off and swim stream, thus being conducive to the formation of equiax crystal.
In liquid cave, best convection effects and stirring action is reached in order to make metal bath, describedly water runner exit place, multiple opening is uniformly distributed along the circumferencial direction watering runner, and each aperture distribution is downward-sloping, and the center line of each opening becomes the angle of 15-60 ° with between the axis watering runner.
Described tundish bottom is provided with LOAD CELLS, and LOAD CELLS is connected with pneumatic control system.The effect of LOAD CELLS is that the weight transient change in tundish is delivered to pneumatic control system, is converted into instantaneous mass difference by pneumatic control system, the more instantaneous liquid level this instantaneous mass difference calculated in tundish is poor.
Described runner periphery of watering is provided with bracing frame, and tundish and LOAD CELLS are all located on bracing frame.
Described crystallizer is provided with cooling water channel, and crystalliser feet is provided with traction chuck.
When said apparatus uses, its method is, waters runner, and control to water the flow velocity of runner exit place metal bath by arranging between tundish and crystallizer, the convection effects of reinforced metal melt in liquid cave and stirring action, thus the crystal in refinement ingot casting.
The described flow control watering runner exit place metal bath is by regulating the gas pressure in tundish to realize, and waters between the gas pressure in the flow velocity of runner exit place metal bath and tundish and meets following relational expression:
In formula: v is the flow velocity watering runner exit place metal bath, P is the gas pressure in tundish, ρ is the density of molten metal, g is acceleration of gravity, H is the liquid level of tundish and the difference in height of watering runner exit place, D is the diameter watering flow passage entry, and d is the opening diameter watering runner exit place, and n is the open amount of watering runner exit place.
Gas pressure in described tundish is regulated in real time by external pneumatic control system.
Above-mentioned air pressure fills the semi-continuous casting method of type and device when using, by controlling the flow velocity watering runner exit place metal bath, and the convection effects of reinforced metal melt in liquid cave and stirring action, thus the crystal in refinement ingot casting.In use procedure, along with the carrying out of semi-continuous casting process, liquid level in tundish constantly declines, namely H is constantly change, be steady state value in order to ensure the flow velocity v watering runner exit place metal bath, need constantly the gas pressure P in adjustment tundish, concrete grammar is as follows: when the liquid level in tundish declines, the weight transient change of tundish is flowed to pneumatic control system by gravity sensor, and be converted into instantaneous mass difference Δ m by pneumatic control system, again this instantaneous mass difference is calculated the instantaneous liquid level difference Δ H in tundish, by the relationship delta P=ρ g Δ H between liquid level difference and pressure differential, instantaneous pressure changes delta P can be obtained, then adjusted the gas pressure P in tundish by gas pressure regulator in good time, thus can guarantee that the flow velocity v watering runner exit place metal bath is steady state value.
In order to the convection effects of reinforced metal melt in liquid cave, the flow velocity v watering runner exit place metal bath can also be adjusted by each opening direction of change and each opening diameter.
The utility model, relative to prior art, has following beneficial effect:
This air pressure fills in the semi-continuous casting device of type, runner is watered by what arrange special construction between tundish and crystallizer, metal bath is made to enter in crystallizer liquid cave under pneumatic control system and the acting in conjunction of watering runner, pass through coutroi velocity, impel copper alloy melt to form strong convection in liquid cave, thus reach and make ingot structure and uniform composition, the thick column crystal of elimination, the object that forms the tiny equiax crystal of crystal grain, suppress macro-components segregation in ingot casting.Be embodied in:
1) flow velocity that metal bath is watering runner exit place is controlled, is easy to realize being uniformly distributed of temperature in melt, promotes that nucleus dissociates, thus greatly refinement ingot casting crystal grain and suppress the component segregation of ingot casting.
2) this apparatus and method principle is simple, and apparatus structure is also simple, being easy to transform on traditional copper alloy semi-continuous casting device, by arranging pneumatic control system and LOAD CELLS, also easily realizing automation.
3) the method is particularly suitable for the easy copper alloy casting ingots producing macro-components segregation such as the tin white copper of manufacture large gauge.
Accompanying drawing explanation
Fig. 1 is the structural representation that this air pressure fills the semi-continuous casting device of type.
Fig. 2 is the structural representation watering runner in Fig. 1.
Fig. 3 a is in embodiment 2, the grain morphology figure of ingot casting obtained by traditional semicontinuous casting technique.
Fig. 3 b is in embodiment 2, the grain morphology figure of ingot casting obtained by this semi-continuous casting method.
Fig. 4 a is in embodiment 3, the grain morphology figure of ingot casting obtained by traditional semicontinuous casting technique.
Fig. 4 b is in embodiment 3, the grain morphology figure of ingot casting obtained by this semi-continuous casting method.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.
Embodiment 1
A kind of air pressure of the present embodiment fills the semi-continuous casting device of type, as shown in Figure 1, comprise tundish 1, guiding gutter 2, plunger rod 3, water runner 4 and crystallizer 5, tundish side arranges guiding gutter, the interface of guiding gutter and tundish arranges plunger rod, be connected by watering runner between tundish with crystallizer, the exit of watering runner forms liquid cave 6; Tundish is sealed construction, and tundish top external gas pressure control system 7.Wherein, by the unlatching of plunger rod, the metal bath in guiding gutter can be made to flow in tundish, by the closedown of plunger rod, the metal bath in guiding gutter can be stoped to flow in tundish.
As shown in Figure 2, watering runner is circular tube shaped runner, and the top of watering runner communicates with tundish, the bottom of watering runner is positioned at crystallizer, watering the bottom end face sealing of runner, watering near bottom end face multiple opening 4-1 runner sidewall had as watering runner exit, each opening is obliquely installed.By the setting of each hatch frame, the metal bath from watering runner outflow is made to have multidirectional convection action to the metal bath in liquid cave, thus the convection current of aggravation metal bath and stirring action, the thermograde be conducive in liquid cave reduces, aggravate washing away of crystalline structure simultaneously, impel it to come off and swim stream, thus being conducive to the formation of equiax crystal.
In liquid cave, best convection effects and stirring action is reached in order to make metal bath, water runner exit place, multiple opening is uniformly distributed along the circumferencial direction watering runner, and each aperture distribution is downward-sloping, and the center line of each opening becomes the angle theta of 15 ~ 60 ° with between the axis watering runner.
Tundish bottom is also provided with LOAD CELLS 8, and LOAD CELLS is connected with pneumatic control system.The effect of LOAD CELLS is that the weight transient change in tundish is delivered to pneumatic control system, is converted into instantaneous mass difference by pneumatic control system, the more instantaneous liquid level this instantaneous mass difference calculated in tundish is poor.
Water runner periphery and be provided with bracing frame 9, tundish and LOAD CELLS are all located on bracing frame.
Crystallizer is provided with cooling water channel 10, and crystalliser feet is provided with traction chuck 11.
The semi-continuous casting method that a kind of air pressure fills type can be realized by said apparatus, runner is watered by arranging between tundish and crystallizer, and control to water the flow velocity of runner exit place metal bath, the convection effects of reinforced metal melt in liquid cave and stirring action, thus the crystal in refinement ingot casting.
The flow control watering runner exit place metal bath is by regulating the gas pressure in tundish to realize, and waters between the gas pressure in the flow velocity of runner exit place metal bath and tundish and meets following relational expression:
In formula: v is the flow velocity watering runner exit place metal bath, P is the gas pressure in tundish, ρ is the density of molten metal, g is acceleration of gravity, H is the liquid level of tundish and the difference in height of watering runner exit place, D is the diameter watering flow passage entry, and d is the opening diameter watering runner exit place, and n is the open amount of watering runner exit place.
Gas pressure in tundish is regulated in real time by external pneumatic control system.
Above-mentioned air pressure fills the semi-continuous casting method of type and device when using, by controlling the flow velocity watering runner exit place metal bath, and the convection effects of reinforced metal melt in liquid cave and stirring action, thus the crystal in refinement ingot casting.In use procedure, along with the carrying out of semi-continuous casting process, liquid level in tundish constantly declines, namely H is constantly change, be steady state value in order to ensure the flow velocity v watering runner exit place metal bath, need constantly the gas pressure P in adjustment tundish, concrete grammar is as follows: when the liquid level in tundish declines, the weight transient change of tundish is flowed to pneumatic control system by gravity sensor, and be converted into instantaneous mass difference Δ m by pneumatic control system, again this instantaneous mass difference is calculated the instantaneous liquid level difference Δ H in tundish, by the relationship delta P=ρ g Δ H between liquid level difference and pressure differential, instantaneous pressure changes delta P can be obtained, then adjusted the gas pressure P in tundish by gas pressure regulator in good time, thus can guarantee that the flow velocity v watering runner exit place metal bath is steady state value.
In order to the convection effects of reinforced metal melt in liquid cave, the flow velocity v watering runner exit place metal bath can also be adjusted by each opening direction of change and each opening diameter.
Embodiment 2
In the present embodiment, adonic is the very wide solid solution alloy of a kind of crystallization temperature, when Slow cooling, easily occurs thick tree-like dendritic crystals, the easily outwards movement along interdendritic of Sn solute in ingot structure, forms the inverse segregation of tin.
First: the semi-continuous casting method and the device that utilize embodiment 1, take following technique:
(1) alloying component is Cu-15Ni-8Sn.Ingot casting specification is φ 180mm.
(2) technological parameter in casting process is as follows: pouring temperature is 1250 ~ 1260 DEG C, and ingot casting hauling speed is 1.6mms/s, and the pressure of cooling water is 0.06MPa, and pressurized gas is argon gas.
(3) the inlet diameter D watering runner is 3.7mm, and each opening diameter d watering runner exit place is 1.5mm, establishes 6 openings altogether, water runner center line and each open centre line angle theta be 60 °.According to the program, the speed v at draft tube outlets place is about 2400 times of ingot casting hauling speed.Therefore, to the metal bath in liquid cave, there is very strong stirring action.
Second: utilize traditional semicontinuous casting technique to produce the alloying component size identical with specification.
Analyzed by the ingot casting that two kinds of different process obtain, result is as follows:
The ingot casting outward appearance obtained by the first casting technique is good, crystal grain is tiny and be all equiax crystal, as shown in Figure 3 b (Fig. 3 a be depicted as the second casting technique obtain the grain morphology figure of ingot casting), both compare, the crystal grain that the first casting technique obtains ingot casting drops to 0.48 ~ 1.15mm by 1.54 ~ 6.23mm of traditional semi-continuous casting, and the tin inverse segregation simultaneously in ingot casting also eliminates (comparing result is specifically in table 1) substantially.
Table 1 Cu-15Ni-8Sn alloy casting state macro-components power spectrum surface analysis (Sn)
Embodiment 3
In the present embodiment, adonic is the very wide solid solution alloy of a kind of crystallization temperature, when Slow cooling, easily occurs thick tree-like dendritic crystals, the easily outwards movement along interdendritic of Sn solute in ingot structure, forms the inverse segregation of tin.
First: the semi-continuous casting method and the device that utilize embodiment 1, take following technique:
(1) alloying component is Cu-15Ni-8Sn-0.35Ti.Ingot casting specification is φ 350mm.
(2) technological parameter in casting process is as follows: pouring temperature is 1250 ~ 1260 DEG C, and ingot casting hauling speed is 1.1mms/s, and the pressure of cooling water is 0.1MPa, and pressurized gas is argon gas.
(3) the inlet diameter D watering runner is 9.8mm, and each opening diameter d watering runner exit place is 4mm, establishes 6 openings altogether, water runner center line and each open centre line angle theta be 15 °.According to the program, the speed v at draft tube outlets place is about 1280 times of ingot casting hauling speed.Therefore, to the metal bath in liquid cave, there is very strong stirring action.
Second: utilize traditional semicontinuous casting technique to produce the alloying component size identical with specification.
Analyzed by the ingot casting that two kinds of different process obtain, result is as follows:
The ingot casting outward appearance obtained by the first casting technique is good, crystal grain is tiny and be all equiax crystal, as shown in Figure 4 b (Fig. 4 a be depicted as the second casting technique obtain the grain morphology figure of ingot casting), both compare, the crystal grain that the first casting technique obtains ingot casting drops to 0.51 ~ 1.27mm by 1.60 ~ 6.35mm of traditional semi-continuous casting, and the tin inverse segregation simultaneously in ingot casting also eliminates (comparing result is specifically in table 2) substantially.
Table 2 Cu-15Ni-8Sn-0.35Ti alloy casting state macro-components power spectrum surface analysis (Sn)
As mentioned above, just can realize the utility model preferably, above-described embodiment is only preferred embodiment of the present utility model, is not used for limiting practical range of the present utility model; Namely all equalizations done according to the utility model content change and modify, all by the utility model claim scope required for protection is contained.
Claims (6)
1. an air pressure fills the semi-continuous casting device of type, it is characterized in that, comprise tundish, guiding gutter, plunger rod, water runner and crystallizer, tundish side arranges guiding gutter, the interface of guiding gutter and tundish arranges plunger rod, be connected by watering runner between tundish with crystallizer, the exit of watering runner forms liquid cave; Tundish is sealed construction, and tundish top external gas pressure control system.
2. a kind of air pressure fills the semi-continuous casting device of type according to claim 1, it is characterized in that, the described runner that waters is circular tube shaped runner, the top of watering runner communicates with tundish, the bottom of watering runner is positioned at crystallizer, watering the bottom end face sealing of runner, watering near bottom end face multiple openings runner sidewall had as watering runner exit, each opening is obliquely installed.
3. a kind of air pressure fills the semi-continuous casting device of type according to claim 2, it is characterized in that, described in water runner exit place, multiple opening is uniformly distributed along the circumferencial direction watering runner, each aperture distribution is downward-sloping, and the center line of each opening becomes the angle of 15 ~ 60 ° with between the axis watering runner.
4. a kind of air pressure fills the semi-continuous casting device of type according to claim 1, it is characterized in that, described tundish bottom is provided with LOAD CELLS, and LOAD CELLS is connected with pneumatic control system.
5. a kind of air pressure fills the semi-continuous casting device of type according to claim 1, it is characterized in that, described in water runner periphery and be provided with bracing frame, tundish and LOAD CELLS are all located on bracing frame.
6. a kind of air pressure fills the semi-continuous casting device of type according to claim 1, it is characterized in that, described crystallizer is provided with cooling water channel, and crystalliser feet is provided with traction chuck.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420766092.XU CN204366001U (en) | 2014-12-05 | 2014-12-05 | A kind of air pressure fills the semi-continuous casting device of type |
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| CN201420766092.XU CN204366001U (en) | 2014-12-05 | 2014-12-05 | A kind of air pressure fills the semi-continuous casting device of type |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104493122A (en) * | 2014-12-05 | 2015-04-08 | 华南理工大学 | Semi-continuous casting method and device for gas pressure mould filling |
| CN105750516A (en) * | 2016-04-05 | 2016-07-13 | 江苏国能合金科技有限公司 | Tundish liquid iron metering and controlling system for amorphous thin strips |
-
2014
- 2014-12-05 CN CN201420766092.XU patent/CN204366001U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104493122A (en) * | 2014-12-05 | 2015-04-08 | 华南理工大学 | Semi-continuous casting method and device for gas pressure mould filling |
| CN105750516A (en) * | 2016-04-05 | 2016-07-13 | 江苏国能合金科技有限公司 | Tundish liquid iron metering and controlling system for amorphous thin strips |
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Granted publication date: 20150603 Termination date: 20171205 |