CN101094740A - Holding furnace for low pressure casting - Google Patents
Holding furnace for low pressure casting Download PDFInfo
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- CN101094740A CN101094740A CN200580040536.5A CN200580040536A CN101094740A CN 101094740 A CN101094740 A CN 101094740A CN 200580040536 A CN200580040536 A CN 200580040536A CN 101094740 A CN101094740 A CN 101094740A
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Abstract
A molten metal holding furnace for supplying a constant quantity of the molten metal to a casting machine is composed of a holding chamber having a melt supply port, and a pressurization chamber having an upward melt outlet port. The holding chamber and the pressurization chamber are communicated with each other via an openable/closable first melt flow passage. The pressurization chamber is composed of a outlet section at which the melt outlet port is positioned and a pressurization section positioned on one side closer to the holding chamber. The holding chamber and the outlet section are juxtaposed with the pressurization section interposed therebetween, where the first melt flow passage is formed at a hearth of the pressurization section, and an openable/closable second melt flow passage communicating with the outlet section is formed at a hearth of the pressurization section.
Description
Technical field
The present invention relates to holding furnace for low pressure casting with the liquation weight feed casting machine of nonferrous metal such as aluminum or aluminum alloy.
Background technology
In the past, the liquid dispensing device that is used for to casting machine weight feed liquation (molten Soup) was known (for example No. 3192623 communique of Japan's special permission)
Disclose such liquid dispensing device in No. 3192623 communique of Japan's special permission, it has: the liquid storage stove, and it has the liquation stream mouth that opens and closes by first intercepter valve (IV) to the bottom surface lifting; Supply chamber, the side of itself and this liquid storage stove is set up in parallel, and the bottom surface has liquation stream mouth, the decompression of can pressurizeing (adding decompression); Decide liquid stove (deciding the Soup stove), itself and this supply chamber is set up in parallel, and has the liquation stream mouth that opens and closes by second intercepter valve (IV) to the bottom surface lifting and has the fluid distributing hole of casting machine being supplied with quantitative liquation in the side; Communicating pipe, it is interconnected described liquid storage stove, supply chamber and the described liquation stream mouth separately of deciding the liquid stove.
And, liquation in the described liquid storage body of heater is supplied with under the described situation of deciding in the liquid stove, at first open the liquation stream mouth of described liquid storage stove, close the described liquation stream mouth of deciding the liquid stove, by to reducing pressure in the described supply chamber, thereby supply with liquation via described communicating pipe to described supply chamber from described liquid storage stove.Then, close the liquation stream mouth of described liquid storage stove, open the described liquation stream mouth of deciding the liquid stove, by to pressurizeing in the described supply chamber, thereby decide the liquid stove and supply with liquation to described via described communicating pipe from described supply chamber.
Under the situation of the liquid dispensing device of No. 3192623 communique record of Japan special permission, dispose described liquid storage stove, supply chamber and decide the described communicating pipe that the bottom of liquid stove is interconnected, the impurity of the oxide in the accumulation liquation etc. easily in this communicating pipe.Thus, the impurity of piling up described communicating pipe between long-term operational period can cause blocked state, can cause smooth and easy the flowing of liquation to become obstruction, in addition, this impurity also can be followed liquation to flow into describedly to decide in the liquid stove, and existence can not guarantee that the liquation that cleans supplies with the problem of described casting machine.In addition, under the situation of this liquid dispensing device, the reduction of the melt temperature of described communicating pipe and described supply chamber is inevitably, so also there is if the liquation of uniform temperature will be supplied with described casting machine the then described very difficult problem of melt temperature management of deciding the liquid stove.In addition, described liquid level top of deciding in the liquid stove needs to form the space, also exists this space to cause the problem of liquation oxidation.
In addition, known in the past various casting is with keeping stove (for example Japanese kokai publication hei 11-138250 communique, No. 3392544 communique of Japan's special permission).
Such casting is disclosed in the Japanese kokai publication hei 11-138250 communique with keeping stove, it is made of liquation holding chamber and compression chamber, have the intercepter valve (IV) that the liquation stream mouth that is positioned at described liquation holding chamber opens and closes, described compression chamber is divided into the fluid portion in the top pressurization part of exerting pressure by gas-pressurized of liquation and the die cavity that liquation flowed into mould.This casting is with the inner lining structure of the multilayer that keeps stove to have iron sheet, flame retardant coating, thermal insulation layer from outside to inside and be made of the liquation accommodating container, and described liquation accommodating container forms one-piece type container as the unsetting refractory substance of alumina type.
The casting of No. 3392544 communique record of Japan's special permission is with under the situation that keeps stove, the valve seat that forms in the open circumferential portion of the liquation holding chamber side of liquation stream mouth is provided with in the portion valve seat that is formed by the parts of establishing in addition with above-mentioned liquation accommodating container, become a face with the inner peripheral surface of described liquation accommodating container above it, this valve seat is connected and separates with the front end of intercepter valve (IV), thereby opens described liquation stream mouth.
Under the situation of casting with the maintenance stove of Japanese kokai publication hei 11-138250 communique record, for the unsetting refractory body of the one-piece type container that makes the described liquation accommodating container that directly contacts with liquation has aeration, casting process repeatedly in, the infiltration liquation is inevitably in the described unsetting refractory body, can produce chapping of described unsetting refractory body and breakage by this infiltration.Particularly, casting manipulations is broken down if this is chapped or breakage occurs in pressurization part or fluid portion.Particularly, the pressurization part generation is chapped or damaged result is, the pressure control that directly influences casting manipulations is unstable, can not carry out the operation of steady and continuous, and the poorest situation is to cause operation to stop.In addition, this is chapped or breakage can cause pressurization to spill the outside with gas, and the pressure controlled precision of result also reduces.On the other hand, if fluid portion produces and to chap or damaged, even then the controlled pressure of pressurization part is in the state of the standard of maintaining, can not fill the liquation of ormal weight to the die cavity in the mould, mo(u)lding becomes defective products.In addition, on the internal face of pressurization part and fluid portion because the set liquation, so need regularly the set thing on this internal face to be removed, and described unsetting refractory body is owing to be crisp matter that removing of described set thing makes described unsetting refractory body surface impaired easily in the operation.
The casting of No. 3392544 communique record of Japan's special permission is with under the situation that keeps stove, the inner peripheral surface of the top and described liquation accommodating container of described valve seat is a face, so the impurity that produces in the liquation holding chamber particularly sediment of the periphery of liquation stream mouth flows in the compression chamber, as a result, can cause liquation to pollute.
Patent documentation 1: No. 3192623 communique of Japan's special permission
Patent documentation 2: Japanese kokai publication hei 11-138250 communique
Patent documentation 3: No. 3392544 communique of Japan's special permission
Summary of the invention
The present invention researches and develops in view of the above problems, its purpose is to provide a kind of smooth and easy the flowing that can keep liquation also can keep the stable weight feed of thereby the pressure controlled good precision of liquation being guaranteed liquation, and, can guarantee not have the suitable liquation of cleaning, the temperature of the pollution that impurity causes and can realize miniaturization and conservative spot check is easy to holding furnace for low pressure casting.
For addressing the above problem, holding furnace for low pressure casting of the present invention provides following technical scheme:
Technical scheme 1: in this holding furnace for low pressure casting, the liquation of nonferrous metal is remained on the temperature of regulation, and a certain amount of liquation is supplied with casting machine.Described holding furnace for low pressure casting is made of with having towards the compression chamber of upper liquid outlet the liquation holding chamber with liquation supply port, and described liquation holding chamber and described compression chamber are communicated with via the first liquation stream to be opened/closed.Described compression chamber is made of fluid portion that described liquid outlet was positioned at and the pressurization part that is positioned at described liquation holding chamber side, and described pressurization part has the upper limit level that detects the liquation in this pressurization part (レ ベ Le: highly) and the level detection device of threshold level and the gas flow path that is communicated with upper space in this pressurization part.Tube heater is flooded respectively in the liquation of the fluid portion that is disposed at described liquation holding chamber and described compression chamber.Described liquation holding chamber and described fluid portion are set up in parallel across described pressurization part, and the described first liquation stream is formed on the bottom of described pressurization part, and the second liquation stream to be opened/closed that is communicated with described fluid portion is formed on the bottom of described pressurization part.Liquation in the described liquation holding chamber makes liquation in the described pressurization part reduce to the threshold level of described pressurization part by supply with gas-pressurized from described gas flow path under the state that closes of the described first liquation stream and under the state of opening of the described second liquation stream after being directed into the upper limit level of described pressurization part via the described first liquation stream under the state that closes of the described second liquation stream.
According to this structure, thereby smooth and easy flow that can keep liquation can be guaranteed the weight feed that liquation is stable, and can guarantee not have the cleaning liquation of the pollution that impurity brings, and can realize miniaturization and make that to guard spot check easy.
The preference 1 of technical scheme 1: the tube heater dipping is disposed in the interior liquation of described pressurization part.
According to this structure, can avoid the melt temperature of pressurization part to reduce.
The preference 2 of technical scheme 1: the liquation in the described liquation holding chamber is directed into when the upper limit level of described pressurization part, utilizes the vacuum exhaust via described gas flow path to come the upper space of described pressurization part is reduced pressure under the state that closes of the described second liquation stream.
According to this structure, can import liquation to pressurization part rapidly.
The preference 3 of technical scheme 1: the internal face of at least one of described pressurization part and described fluid portion forms by the liner parts that are made of fine ceramic system one burned material cylindraceous.
According to this structure, can prevent at least one the chapping and the damage of the described internal face during operation damaged and that described internal face is removed the set thing of internal face of pressurization part and fluid portion, thereby keep pressure controlled good accuracy to liquation, guarantee the weight feed that liquation is stable, and make conservative spot check easy.
Technical scheme 2: in this holding furnace for low pressure casting, the liquation of nonferrous metal is remained on the temperature of regulation, and a certain amount of liquation is supplied with casting machine.Described holding furnace for low pressure casting is made of with having towards the compression chamber of upper liquid outlet the liquation holding chamber with liquation supply port, and described liquation holding chamber and described compression chamber are communicated with via the first liquation stream to be opened/closed.Described compression chamber is made of fluid portion that described liquid outlet was positioned at and the pressurization part that is positioned at described liquation holding chamber side, and described pressurization part has the level detection device of the upper limit level that detects the liquation in this pressurization part and threshold level and the gas flow path that is communicated with upper space in this pressurization part.Tube heater is flooded respectively in the liquation of the fluid portion that is disposed at described liquation holding chamber and described compression chamber.The pressurization part of described compression chamber and fluid portion are interconnected in the bottom via the bottom circulation flow path, and at least one internal face of described pressurization part and described fluid portion forms by the liner parts that are made of fine ceramic system one burned material cylindraceous.After liquation in the described liquation holding chamber is directed into the upper limit level of described pressurization part via the described first liquation stream, under the state that closes of the described first liquation stream, make liquation reduce to the threshold level of described pressurization part by supplying with gas-pressurized from described gas flow path.
According to this structure, can prevent at least one the chapping and the damage of the described internal face during operation damaged and that described internal face is removed the set thing of internal face of pressurization part and fluid portion, thereby keep pressure controlled good accuracy to liquation, guarantee the weight feed that liquation is stable, and make conservative spot check easy.
The preference 1 of technical scheme 2: described fine ceramic system one burned material is made of the nitrogen silicon compound.
According to this structure, can further improve at least one the durability of internal face of pressurization part and fluid portion.
The preference 2 of technical scheme 2: the described first liquation stream is formed on the bottom of described liquation holding chamber, the valve seat that the bottom of valve seat of opening that constitutes the liquation holding chamber side of the described first liquation stream is fixed on the described first liquation stream is provided with portion, the upper surface of this valve seat be located at than around the high position, bottom surface of liquation holding chamber.
According to this structure, by the upper surface with valve seat be formed on than around the high position, bottom surface of liquation holding chamber, the sediment that can suppress in the liquation holding chamber flows in the compression chamber, guarantee in the compression chamber do not have impurity band the liquation of cleaning of pollution.
In sum,, can guarantee the stable weight feed of liquation, prevent that the liquation of compression chamber from polluting, realize miniaturization, make conservative spot check easy according to holding furnace for low pressure casting of the present invention.
Description of drawings
The different accompanying drawings of the present invention use same reference numerals to represent same section, and invention will be further ex-plained with reference to the appended drawings.
Fig. 1 is the profile of the holding furnace for low pressure casting of first embodiment of the present invention.
Fig. 2 is the profile of the holding furnace for low pressure casting of second embodiment of the present invention.
Fig. 3 is the profile of the holding furnace for low pressure casting of the 3rd embodiment of the present invention.
Fig. 4 is the profile of the holding furnace for low pressure casting of the 4th embodiment of the present invention.
Fig. 5 is the interior partial enlarged drawing of round I of Fig. 4.
Fig. 6 is the interior partial enlarged drawing of round II of Fig. 4.
Fig. 7 is the interior partial enlarged drawing of round III of Fig. 4.
Description of reference numerals
1～4 holding furnace for low pressure casting
11 liquation holding chambers
12 compression chambers
12a pressurization part (liquation supply chamber)
12b fluid portion (liquid outtake chamber)
20 keep chamber cap
21 open-close lids
22 liquation supply ports
23 horizon sensors
24 tube heaters
25 first liquation streams or liquation stream (supply opening or liquation stream mouth)
26 second liquation streams (leakage fluid dram)
27 first intercepter valve (IV) or intercepter valve (IV)s
28 second intercepter valve (IV)s
29 horizon sensors (level detection device)
31 tube heaters
32 gas flow paths (add decompression and use gas supply port) with stream or pressurization
33 partition walls
34 tube heaters
35 liquid outlets
36 moulds
37 die cavitys
38,39 liner parts
41 weigh feeders
42 liquation streams
43 injection assemblies
44 horizon sensors
51 weigh feeders
52 linings
The M liquation
The U upper limit level
The L threshold level
S attracts the end level
P pressurization end level
C decides liquid level
The specific embodiment
Fig. 1 is the holding furnace for low pressure casting 1 of expression first embodiment of the present invention.Holding furnace for low pressure casting 1 is made of the liquation holding chamber 11 and the compression chamber 12 of configuration arranged side by side, and described compression chamber 12 has pressurization part 12a and the 12b of fluid portion, and pressurization part 12a and the 12b of fluid portion are chambers independently separately.
Pressurization part 12a bottom has first liquation stream 25 that is communicated with the bottom of liquation holding chamber 11 and the second liquation stream 26 that is communicated with the bottom of the 12b of fluid portion.The first liquation stream 25 is positioned at the top of the bottom surface of liquation holding chamber 11, and the second liquation stream 26 is positioned at the top of the bottom surface of the 12b of fluid portion.And the first liquation stream 25 opens and closes by liftable first intercepter valve (IV) 27, and the second liquation stream 26 opens and closes by liftable second intercepter valve (IV) 28.In addition, the upper limit liquid level of the liquation M in the pressurization part 12a and lower limit liquid level detect by horizon sensor (level detection device) 29, and the melt temperature of pressurization part 12a can remain on desired temperature by tube heater 31.Tube heater 31 dippings are configured in the liquation of pressurization part 12a.In addition, add the gas flow path 32 that decompressor is connected and be communicated with setting, can pressurize or reduce pressure in the pressurization part 12a with the top seal lid 18 of pressurization part 12a with not shown.
The 12b of fluid portion is separated with liquation holding chamber 11 by partition wall 33, only can be communicated with via pressurization part 12a.In addition, the 12b of fluid portion tilts in the high more mode in bottom surface away from the below of the second liquation stream 26 more, be provided with the tube heater 34 that is used for the liquation of the 12b of fluid portion is remained on desired temperature in the rake, it is located in the liquation with impregnation state, is positioned at the liquid outlet 35 that forms on the end of extreme higher position towards upper shed.In addition, the top fixed mould 36 of liquid outlet 35, the die cavity 37 in the mould 36 is communicated with liquid outlet 35.
In addition, each internal face of the liquid outlet 35 of pressurization part 12a and the 12b of fluid portion is made of liner parts 38,39, and the fine ceramic cylindraceous (for example nitrogen silicon compound) that is provided with system one burned material constitutes these liner parts by covering the wall that refractory body constituted.Its effect describes in detail in the 4th embodiment described later.
The operational method of the holding furnace for low pressure casting 1 of described formation then, is described.
At first, at the beginning, make open-close lid 21 rotations, open liquation supply port 22, supply with liquation M from this liquation supply port 22.Then, carry out the decompression that adds in the switching of switching, the second liquation stream 26 of the first liquation stream 25 and the pressurization part 12a, form such A-stage, promptly, 11 inner melt M remain on upper limit level U in the liquation holding chamber, remain on the horizontal S of attraction end at pressurization part 12a inner melt M, remain at the 12b of fluid portion inner melt M and decide liquid level C as upper limit liquid level.Afterwards, close the first liquation stream 25, the second liquation stream 26 and liquation supply port 22.
The top of liquid outlet 35 and mould 36 forms incorporate state, and under this state, the rising by second intercepter valve (IV) 28 makes the second liquation stream 26 become out state, and by from the gas-pressurized of gas flow path 32 to pressurizeing in the pressurization part 12a.As a result, the liquation M in the pressurization part 12a flows in the fluid 12b of portion from the second liquation stream 26, and the liquation in the 12b of fluid portion begins to be filled in the die cavity 37 from liquid outlet 35.
Liquid level in the pressurization part 12a descends, when horizon sensor 29 detects the pressurization end horizontal P of liquid level arrival as the lower limit liquid level, the then end-of-fill of liquation in die cavity 37.In addition, after the occupied state of liquation is kept the stipulated time, stop to supply with gas-pressurized from gas flow path 32, the pressure in the pressurization part 12a is reduced to atmospheric pressure, then closes the first liquation stream 26 by the decline of second intercepter valve (IV) 28.Then, open mould 36 after the stipulated time, take out the casting product, afterwards, closing molding 36 becomes integrated again.
In addition, close the second liquation stream 26, then first intercepter valve (IV) 27 rises, and opens the first liquation stream 25, and pressurization part 12a and liquation holding chamber 11 become connected state.And, begin from gas flow path 32 vacuum exhausts decompression in the pressurization part 12a.As a result, the liquation of pressurization part 12a flows into pressurization part 12a via the first liquation stream 25.
Liquid level in the pressurization part 12a rises, and when horizon sensor 29 detected the horizontal S of liquid level arrival attraction end, then first intercepter valve (IV) 27 descended, and the first liquation stream 25 is closed, and also stops from the vacuum exhaust of gas flow path 32.
Thus, finish once and spray, then, carry out described operation repeatedly.On the other hand, liquid level in the liquation holding chamber 11 descends, when horizon sensor 23 detects liquid level and drops to threshold level L, then by not shown device notifying operation person, detect by horizon sensor 23 liquid level arrive upper limit level U before from liquation supply port 22 supply liquations.
Like this, in this holding furnace for low pressure casting 1, the bottom surface that is higher than liquation holding chamber 11 that the first liquation stream 25 of pressurization part 12a forms, liquation holding chamber 11 and the 12b of fluid portion are separated by partition wall 33, only the first liquation stream 25 of pressurization part 12a and the second liquation stream 26 and can be communicated with.Thus, can stop the impurity of the bottom that is deposited in liquation holding chamber 11 to flow in the fluid 12b of portion, not have the inaccessible stream of impurity and guarantee that liquation flows smoothly.
In addition, in this holding furnace for low pressure casting 1, be inclined upwardly to liquid outlet 35 from the first liquation stream 26, thereby can stop described impurity to flow in the die cavity 37 fully by making the 12b of fluid portion, the liquation of keeping in the die cavity 37 always is maintained in the clean condition, and prevents that it is oxidized.In addition, liquation holding chamber 11, pressurization part 12a, the 12b of fluid portion separate a wall respectively and are set up in parallel, and are situated between at thing without any the centre, can be interconnected, and therefore, can realize the miniaturization of holding furnace for low pressure casting 1 and the facilitation of conservative spot check.In addition, by configuration tube heater 24 in pressurization part 12a, thereby can improve the precision of the melt temperature in the pressurization part 12a.
Fig. 2 is the holding furnace for low pressure casting 2 of expression second embodiment of the present invention.In this holding furnace for low pressure casting 2, the common mutually identical Reference numeral of part use of holding furnace for low pressure casting 1 with Fig. 1 represents omits explanation.
In the holding furnace for low pressure casting 2, above liquid outlet 35, replace mould 36 and the weigh feeder 41 of top feed flow type is set.This weigh feeder 41 has the injection assembly 43 that forms the liquation stream 42 that bends to Japanese ideogram " ㄑ " shape that is communicated with liquid outlet 35, and the leading section of this injection assembly 43 connects not shown casting machine.In addition, horizon sensor 44 is set on the weigh feeder 41, that can detect liquation M in liquation stream 42 decides liquid level C.In addition, in this holding furnace for low pressure casting 2, melting liquid horizontal in the pressurization part 12a descends, when detecting the horizontal P of liquid level arrival pressurization end by horizon sensor 29, then second intercepter valve (IV) 28 descends, and the second liquation stream 26 is closed, and also stops to supply with gas-pressurized from gas flow path 32, except that this point, the aforesaid operations method all is suitable for.
Fig. 3 is the holding furnace for low pressure casting 3 of expression the 3rd embodiment of the present invention.In this holding furnace for low pressure casting 3, use identical Reference numeral, omit explanation with the part that holding furnace for low pressure casting 1 shown in Figure 1 is common mutually.
In the holding furnace for low pressure casting 3, above liquid outlet 35, replace mould 36 to be provided with the weigh feeder 51 of bottom feed flow type.This weigh feeder 51 is connected with not shown casting machine on the paper direction inwards of columnar lining 52 shown in Figure 3, is connected with the ejaculation cylinder body with not shown injection plunger of advance and retreat in lining 52 on the outside direction of paper.And, in lining 52, supply with liquation from liquid outlet 35, then described ejaculation cylinder body action, described injection plunger advances, and the liquation in the lining 52 extrudes to described casting machine.Thus, fill liquation in the die cavity of casting machine.Afterwards, described injection plunger retreats to original position.In addition, in this holding furnace for low pressure casting 3, also be the melting liquid horizontal decline in the pressurization part 12a, when horizon sensor 29 detects liquid level and arrives the horizontal P of pressurization end, second intercepter valve (IV) 28 is descended, and the second liquation stream 26 is closed, and also stops to supply with gas-pressurized from gas flow path 32, except that this point, the aforesaid operations method is suitable for.
In the above-mentioned holding furnace for low pressure casting 2 and 3 all be with the situation of holding furnace for low pressure casting 1 in the same manner, can stop the impurity of the bottom that is deposited in liquation holding chamber 11 to flow in the fluid 12b of portion, do not have the inaccessible stream of impurity and guarantee that liquation flows smoothly, in addition, stop above-mentioned impurity to flow in the die cavity 37, keep the clean conditions of die cavity 37 inner melts, prevent that it is oxidized etc.In addition, with above-mentioned the same, can realize the miniaturization of holding furnace for low pressure casting 1 and the facilitation of conservative spot check.In addition, by configuration tube heater 24 in pressurization part 12a, thereby can improve the precision of the melt temperature in the pressurization part 12a.
The holding furnace for low pressure casting 4 of Fig. 4～7 expressions the 4th embodiment of the present invention.This holding furnace for low pressure casting 4 has configuration arranged side by side, liquation holding chamber 11 that the bottom is interconnected and compression chamber 12.
Compression chamber 12 has pressurization part 12a and the 12b of fluid portion that is interconnected in the bottom via the bottom circulation flow path 17 that is communicated with liquation stream 25.The 12b of fluid portion has towards upper liquid outlet 35.In addition, pressurization part 12a is positioned at liquation supply chamber 11 sides with respect to the 12b of fluid portion.
The internal face of the liquid outlet 35 of the internal face of pressurization part 12a and the 12b of fluid portion is made of liner parts 38,39, and the fine ceramic cylindraceous (for example nitrogen silicon compound) that is provided with system one burned material constitutes these liner parts by covering the wall that refractory body constituted.In addition, on the 12b of fluid portion of compression chamber 12, tube heater 34 dipping is arranged in the liquation, on the top seal lid 18 of pressurization part 12a gas flow path 32 is set, and this top seal lid 18 hangs the water holding sensor 29 (level detection device) of flating pass certainly.Thus, the upper space of liquation is pressurized, and detects the liquid level of deciding of the interior liquation of pressurization part 12a.In addition, be fixed on lower mould on the top of liquid outlet 35 with fixed mould 36 on sheet material (ダ イ ベ one ス) 45, the die cavity 37 of liquid outlet 35 and mould 36 is communicated with via the liquid-through hole 46 of lower mould with sheet material 45.
In addition, in the liquation holding chamber 11 of Fig. 4, double dot dash line U represents the liquid level upper limit level, and double dot dash line L represents the liquid level threshold level.
In the holding furnace for low pressure casting 4 that constitutes by said structure, under liquation stream 25 closing state, liquation in the 12a of compression chamber remains on decides liquid level, on the other hand, liquid level in the liquation holding chamber 11 remains between above-mentioned double dot dash line U and the L, and by tube heater 24 and 34 liquation is remained in the certain temperature range.And, the gas-pressurized of sending into by gas flow path 32 (N for example
2, inactive gas such as Ar) to the 12a of compression chamber pressurization, when the liquid level in the 12a of compression chamber reduces, liquation is pressed in the die cavity 37 of mould 36 via liquid-through hole 46 from the liquid outlet 35 of the 12b of fluid portion, cast.
As mentioned above, the internal face of the liquid outlet 35 of 12a of compression chamber and the 12b of fluid portion is made of liner parts 38,39, and the fine ceramic cylindraceous (for example nitrogen silicon compound) that is provided with system one burned material constitutes these liner parts by covering the wall that refractory body constituted.Thus, can prevent that the liquation infiltration from causing internal face to chap or breakage, and reduce and remove the damage that in the operation of the impurity of set on the internal face internal face is caused, improve the durability of internal face.In addition, among the pressurization part 12a, can prevent that gas-pressurized from spilling, improve the pressure controling precision of gas-pressurized, thereby and can make good casting product by avoiding liquid outlet 35 place's liquations to be penetrated into chapping of internal face and internal face and damaged a certain amount of liquation being filled in the die cavity 37 reliably.In addition, liner parts 38,39 use the one burned material of the nitrogen silicon compound system that particularly elevated temperature strength, high-temperature wearable consumption and heat-resisting impact are good in the fine ceramic system cylindraceous, thereby can further improve the durability of the internal face of pressurization part 12a and liquid outlet 35.In addition, the valve seat of liquation stream 25 is provided with the valve seat 16 of the one burned material that is provided as nitrogen silicon compound system in the portion 15, with above-mentioned same, can improve its durability, and the upper end of valve seat 16 be arranged on than around the bottom surface of liquation holding chamber 11 in high position, thereby the sediment that can suppress in the liquation holding chamber 11 flows in the compression chamber 12, but Min. ground stops the liquation of compression chamber 12 to pollute.
In addition, in the holding furnace for low pressure casting 4 of above-mentioned the 4th embodiment, both internal face of the liquid outlet 35 of pressurization part 12a and the 12b of fluid portion forms by the liner parts 38,39 that are made of fine ceramic system one burned material cylindraceous, but also can be that at least one internal face of the liquid outlet 35 of pressurization part 12a and the 12b of fluid portion forms by the liner parts 38,39 that are made of fine ceramic system one burned material cylindraceous.
The present invention is fully described in illustrative mode with reference to accompanying drawing, and hint also can be done all changes and improvement, and this is that nature is understood for those skilled in the art.Therefore, such change and improvement are only otherwise the aim of unconventional the present invention protection just belongs in the scope of protection of the invention.
Industrial utilizability
Holding furnace for low pressure casting of the present invention is such as the nonferrous metal that is applicable to aluminium, aluminium alloy etc. The manufacturing of the foundry goods that consists of.
Claims (7)
1. holding furnace for low pressure casting, its liquation with nonferrous metal remains on set point of temperature, and a certain amount of liquation is supplied with casting machine, it is characterized in that,
Described holding furnace for low pressure casting is made of with having towards the compression chamber of upper liquid outlet the liquation holding chamber with liquation supply port, and described liquation holding chamber and described compression chamber are communicated with via the first liquation stream to be opened/closed,
Described compression chamber is made of fluid portion that described liquid outlet was positioned at and the pressurization part that is positioned at described liquation holding chamber side, described pressurization part has the level detection device of the upper limit level that detects the liquation in this pressurization part and threshold level and the gas flow path that is communicated with upper space in this pressurization part
Tube heater is flooded respectively in the liquation of the fluid portion that is disposed at described liquation holding chamber and described compression chamber,
Described liquation holding chamber and described fluid portion are set up in parallel across described pressurization part, and the described first liquation stream is formed on the bottom of described pressurization part, and the second liquation stream to be opened/closed that is communicated with described fluid portion is formed on the bottom of described pressurization part,
Liquation in the described liquation holding chamber makes liquation in the described pressurization part reduce to the threshold level of described pressurization part by supply with gas-pressurized from described gas flow path under the state that closes of the described first liquation stream and under the state of opening of the described second liquation stream after being directed into the upper limit level of described pressurization part via the described first liquation stream under the state that closes of the described second liquation stream.
2. holding furnace for low pressure casting as claimed in claim 1 is characterized in that, the tube heater dipping is disposed in the interior liquation of described pressurization part.
3. holding furnace for low pressure casting as claimed in claim 1 or 2, it is characterized in that, liquation in the described liquation holding chamber is directed into when the upper limit level of described pressurization part, utilizes the vacuum exhaust via described gas flow path to come the upper space of described pressurization part is reduced pressure under the state that closes of the described second liquation stream.
4. as each described holding furnace for low pressure casting of claim 1～3, it is characterized in that the internal face of at least one of described pressurization part and described fluid portion forms by the liner parts that are made of fine ceramic system one burned material cylindraceous.
5. holding furnace for low pressure casting, its liquation with nonferrous metal remains on set point of temperature, and a certain amount of liquation is supplied with casting machine, it is characterized in that,
Described holding furnace for low pressure casting is made of with having towards the compression chamber of upper liquid outlet the liquation holding chamber with liquation supply port, and described liquation holding chamber and described compression chamber are communicated with via the first liquation stream to be opened/closed,
Described compression chamber is made of fluid portion that described liquid outlet was positioned at and the pressurization part that is positioned at described liquation holding chamber side, described pressurization part has the level detection device of the upper limit level that detects the liquation in this pressurization part and threshold level and the gas flow path that is communicated with upper space in this pressurization part
Tube heater is flooded respectively in the liquation of the fluid portion that is disposed at described liquation holding chamber and described compression chamber,
The pressurization part of described compression chamber and fluid portion are interconnected in the bottom via the bottom circulation flow path, and at least one internal face of described pressurization part and described fluid portion forms by the liner parts that are made of fine ceramic system one burned material cylindraceous,
After liquation in the described liquation holding chamber is directed into the upper limit level of described pressurization part via the described first liquation stream, under the state that closes of the described first liquation stream, make liquation reduce to the threshold level of described pressurization part by supplying with gas-pressurized from described gas flow path.
6. holding furnace for low pressure casting as claimed in claim 5 is characterized in that, described fine ceramic system one burned material is made of the nitrogen silicon compound.
7. as claim 5 or 6 described holding furnace for low pressure casting, it is characterized in that, the described first liquation stream is formed on the bottom of described liquation holding chamber, the valve seat that the bottom of valve seat of opening that constitutes the liquation holding chamber side of the described first liquation stream is fixed on the described first liquation stream is provided with portion, the upper surface of this valve seat be located at than around the high position, bottom surface of liquation holding chamber.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP340866/2004 | 2004-11-25 | ||
| JP2004340866A JP4615300B2 (en) | 2004-11-25 | 2004-11-25 | Holding furnace for low pressure casting |
| JP2005119883A JP4431078B2 (en) | 2005-04-18 | 2005-04-18 | Holding furnace for molten metal supply |
| JP119883/2005 | 2005-04-18 | ||
| PCT/JP2005/020844 WO2006057179A1 (en) | 2004-11-25 | 2005-11-14 | Holding furnace for supplying fixed amount of molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101094740A true CN101094740A (en) | 2007-12-26 |
| CN101094740B CN101094740B (en) | 2011-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2005800405365A Active CN101094740B (en) | 2004-11-25 | 2005-11-14 | Holding furnace for quantitative supply of melting solution |
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| Country | Link |
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| JP (1) | JP4615300B2 (en) |
| CN (1) | CN101094740B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2006150370A (en) | 2006-06-15 |
| JP4615300B2 (en) | 2011-01-19 |
| CN101094740B (en) | 2011-05-04 |
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