CN1325202C - Vacuum control device for press caster and method thereof - Google Patents
Vacuum control device for press caster and method thereof Download PDFInfo
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- CN1325202C CN1325202C CNB2005100837657A CN200510083765A CN1325202C CN 1325202 C CN1325202 C CN 1325202C CN B2005100837657 A CNB2005100837657 A CN B2005100837657A CN 200510083765 A CN200510083765 A CN 200510083765A CN 1325202 C CN1325202 C CN 1325202C
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/14—Machines with evacuated die cavity
- B22D17/145—Venting means therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
- F04D17/168—Pumps specially adapted to produce a vacuum
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a acuum control device for press caster and method thereof. To increase vacuum in a cavity to a set value using a relative pressure vacuum meter to measure pressure in the cavity and controlling a vacuum pump based on the accurate value of vacuum obtained by the relative pressure vacuum meter, the relative pressure vacuum meter which is inexpensive, durable to positive pressure and indicates such an accurate value of vacuum as the value obtained by using absolute pressure vacuum meter. The atmospheric pressure surrounding a die casting machine is measured beforehand and the feedbackof this result is fed back to a vacuum measuring instrument used when the molten metal is poured into the cavity in the die, and while measuring the absolute pressure vacuum in the cavity in the die by the relative pressure vacuum meter by offsetting the atmospheric pressure, the pressure in the inner part of the cavity in the die is reduced.
Description
[technical field]
The present invention relates to a kind of evacuated die-casting process (die casting) method of in the die cavity of metal pattern, in this metal pattern die cavity, injecting metallic solution after the vacuum pumping in advance, especially, the present invention relates to a kind ofly utilizing the relative pressure pressure vacuum ga(u)ge to measure in the metal pattern die cavity the actual evacuated die-casting process method of carrying out the mensuration of absolute pressure vacuum values and casting in the vacuum.
[background technology]
Up to the present, the known method of making large component is to come in conjunction with small-sized aluminum casting spare by the mode of welding when making the aluminum large component of automobile component etc.For this reason, need the high-quality small-sized aluminum casting spare of casting.As the technology of making high-quality foundry goods, vacuum die-casting method is known.
In vacuum die-casting method, the higher vacuum of maintenance makes the gas content in the metallic solution less in the metal pattern die cavity by making, thereby can not produce the deviation of the product quality of induced gas, can cast high-quality precise part.Generally, for for the gas content in the product that becomes high-quality cast member, the contained bubble volume of product that must remain per 100 gram weight should be below 1ml.
Utilize vavuum pump that the mode that reduces pressure in the die cavity is made at present and have higher vacuum in the metal pattern die cavity.The applicant has proposed a kind of for to make the gas content in the product less, to further improve the vacuum in the die cavity, and the vacuum tube that vavuum pump and die cavity are connected is set in gas exhaust piping, being provided with simultaneously by electromagnetic force makes the vacuum tube valve body in the gas exhaust piping open and close the technical scheme (referring to patent document 1) of carrying out straight-line electromagnetic actuator device on the direction, according to the conventional art, because of valve body has good response characteristic, thereby can reduce pressure effectively at short notice, like this, just can reach higher vacuum state in the die cavity.
Existing vacuum die-casting method is by using the casting result of the actual aluminum casting spare that carries out of above-mentioned die cavity decompression technology, for the vacuum in the metal pattern die cavity can being remained on below the 5hPa, and can will remain under the 1cc as gas contents casting good product condition, in per 100 gram weight products.
Patent document 1: TOHKEMY 2002-239705 number
It is as follows to invent technical problem to be solved:
But under same service condition, because the process of date or time, the vacuum in the metal pattern die cavity usually has can reach the following situation of 5hPa, also has to reach the following situation of 5hPa.
For solve in the metal pattern die cavity vacuum under the same service condition because the process of date or time can not remain on the problem below the determined value (5hPa) consistently, the inventor finds following important research achievement by multiple test
At first, measure used existing absolute pressure vacuum gage of vacuum meter and the relative pressure vacuum meter of vacuum in the metal pattern die cavity.Absolute pressure vacuum gage is to measure the absolute value of vacuum according to literal meaning, but its price is higher, normal pressure that produces in the die cavity when existing not anti-casting the and the significant deficiency that is vulnerable to damage.Reason for this reason, the relative pressure vacuum meter of the positive pressure that produces when adopting low price in the prior art and can bear casting is measured to be pressurised into the relative vacuum degree of benchmark in pairs.
But, under the situation of using this relative pressure vacuum meter,,, can judge that vacuum has produced deviation owing to this reason because the difference of weather situation can be subjected to the influence of change of atmospheric pressure.For example, as shown in Figure 3, use the relative pressure vacuum meter to detect, compare during with the 1013hPa of A condition, when the 1063hPa of the higher B state of atmospheric pressure, the pressure in the metal pattern die cavity is also higher, if begin decompression from this state, although absolute pressure can not reach setting (5hPa), owing to be identical, thereby can be considered and to reach setting (5hPa) with atmospheric difference P.
[summary of the invention]
Therefore, the objective of the invention is provides a kind of vacuum control unit of die casting machine for solving the above-mentioned problems in the prior art, the vacuum control unit of this die casting machine utilizes low price and the relative pressure vacuum meter that normal pressure has a durability is measured pressure in the metal pattern die cavity, just as reality is used absolute pressure vacuum gage, by making the vacuum setting value in the die cavity not be subjected to atmospheric the influence as vavuum pump and vacuum tank.
In addition, another object of the present invention provides a kind of evacuated die-casting process method, promptly measure die casting machine atmospheric pressure on every side in advance, use this result to repair atmospheric change conditions, vacuum state when in measuring die cavity, realizing in the absolute pressure vacuum values as setting, and under this vacuum state, inject metallic solution.
For achieving the above object, of the present invention making by the vacuum control unit of the formed die cavity decompression of fixing metal mould and movable metal pattern with the die casting machine of shaping, have following characteristics, promptly comprise: in, include and make the used vacuum tube of aforementioned die cavity decompression at interior vacuum loop; Detect the used device of die casting machine external pressure; With described atmospheric pressure is that benchmark is measured the used relative pressure vacuum meter of relative vacuum pressure in the aforementioned die cavity; Obtain the determination data of aforementioned relative pressure vacuum meter and atmospheric value is worth by way of compensation and the vacuum pressure value that aforementioned relative pressure vacuum meter is measured is converted to the used scaler of absolute pressure vacuum values; Aforementioned absolute pressure vacuum values is shown used vacuum display unit on display.
In addition, of the present invention making by the vacuum control unit of the formed die cavity decompression of fixing metal mould and movable metal pattern with the die casting machine of shaping has following characteristics, promptly comprises: detect the used checkout gear of die casting machine external pressure; With described atmospheric pressure is that benchmark is measured the used relative pressure vacuum meter of relative vacuum pressure in the aforementioned die cavity; Possess vacuum tank, vavuum pump is measured vacuum meter in the used case of vacuum in the aforementioned vacuum tank, the vacuum loop of the vacuum tube that the discharge duct switching station that is communicated with aforementioned vacuum tank and die cavity is used; Obtain the determination data of aforementioned relative pressure vacuum meter and atmospheric value is worth by way of compensation and vacuum pressure value that aforementioned relative pressure vacuum meter is measured is converted to the used scaler of absolute pressure vacuum values; Aforementioned absolute pressure vacuum values is shown used vacuum display unit on display; The motion of control vavuum pump is to remain on the vacuum in the aforementioned vacuum tank the used apparatus for controlling pump of specified vacuum degree; The vacuum tube control device of opening described vacuum tube in the shaping and aforementioned die cavity being connected with vacuum tank; The present invention disposes said apparatus, is decompressed to determined absolute vacuum degree by described vacuum tank in the vacuum in utilizing aforementioned relative pressure vacuum meter mensuration die cavity.
In addition, evacuated die-casting process method of the present invention is, when the casting beginning, to the metal pattern die cavity in after the decompression in advance, in same metal pattern die cavity, inject the evacuated die-casting process method of metallic solution, have following feature, promptly comprise: in, the operation of die casting machine external pressure measured in advance; When the aforementioned metal mould is closed, metallic solution is injected into the operation in the die cavity; Used vacuum determinator feeds back atmospheric measurement result and atmospheric pressure is worth by way of compensation and reduces the operation of metal pattern die cavity internal pressure when utilizing aforementioned relative pressure vacuum meter to measure the absolute pressure vacuum values of metal pattern die cavity when injecting metallic solution in the metal pattern die cavity; After stopping to reduce pressure die cavity is opened the operation of metal pattern to atmosphere opening.
The effect of invention is described as follows:
According to the present invention, use low price and the relative pressure vacuum meter that normal pressure has a durability is measured the cavity pressure in the metal pattern, in fact can equally with the use absolute pressure vacuum gage show accurate vacuum pressure value, according to this vacuum pressure value vavuum pump is controlled, thereby made the vacuum setting in the die cavity keep constant and not be subjected to atmospheric the influence.
In addition, the present invention with vacuum tank with close vacuum tube etc. and combine and use the relative pressure vacuum meter to measure pressure in the metal pattern die cavity, and reach and the identical effect of use absolute pressure vacuum gage essence, the metal pattern die cavity is reduced pressure.
In addition, measure die casting machine atmospheric pressure on every side in advance according to the present invention, use this result to revise the change conditions of the suffered atmospheric pressure of relative pressure vacuum meter, in measuring die cavity, realize vacuum state in the absolute pressure vacuum values, therefore, can not be subjected to the influence of the change of atmospheric pressure that causes owing to climate change, realize the necessary numerical value of casting good product thereby vacuum in the metal pattern die cavity can be brought up to reliably, and with gas content be suppressed at a certain amount of below, so then can stably make high-quality cast member.
[description of drawings]
Figure 1 shows that structure chart, shown an embodiment of die casting machine vacuum control unit among the figure according to die casting machine of the present invention;
Figure 2 shows that structure chart, shown another embodiment of die casting machine vacuum control unit among the figure according to die casting machine of the present invention;
Figure 3 shows that explanation relative pressure vacuum meter is according to the pressure state figure in the shown metal pattern die cavity of the difference of atmospheric pressure.
Symbol description
1------------------------------------sleeve 15---push strut 16---relative pressure vacuum meter 17---absolute pressure vacuum gage 18---control device 22---scaler---sprays to ejecting device 12a to electromagnetic actuators 11 to secondary vavuum pump 10 to main vacuum pump 9 to secondary vacuum tank 8 to main vacuum tank 7 to metal pattern die cavity 5 to movable metal pattern 4 to fixing metal mould 3 to metal mould device 2 in plunger top portion 13 to close vacuum tube 6
[specific embodiment]
An embodiment to die casting machine vacuum control unit according to the present invention and pressure casting method thereof is described below with reference to accompanying drawings.
The vacuum control unit of present embodiment and the critical piece of die casting machine thereof have been shown among Fig. 1.What reference symbol 1 was indicated is metal mould device.This metal mould device 1 is made of fixing metal mould 2 and movable metal pattern 3, internal fixation metal pattern 2a is installed in fixing metal mould 2, and in movable metal pattern 3 inner moveable metal pattern 3a is installed.Like this, movable metal pattern 3 can move in left and right directions shown in Figure 1 with respect to fixing metal mould 2, when movable metal pattern 3 contacted with fixing metal mould 2 at metal pattern faying face C place, internal fixation metal pattern 2a and inner moveable metal pattern 3a just formed metal pattern die cavity 4.
Corresponding, backing vacuum pump 9 forms secondary vacuum loop.This pair vacuum loop makes the gap at the gap at fixing metal mould 2 and the faying face place of internal fixation metal pattern 2a and movable metal pattern 3 and the faying face place of inner moveable metal pattern 3a etc. keep vacuum.Can prevent in decompression process that by being used in combination of this pair vacuum loop air from entering in the metal pattern die cavity 4.
What reference symbol 11 was indicated is ejecting device.Be furnished with the 12a of plunger top portion at front end from the extended piston rod 12 of hydraulic cylinder not shown in the figures.The 12a of this plunger top portion can be entrenched in with advancing and retreat and spray in the sleeve 13.When casting, the 12a of plunger top portion advances in left the direction in the drawings, ejects the metallic solution that is supplied to metal die cavity 4 from supply port 14.Reference symbol 15 is a push strut, when goods take out, when fixing metal mould 2 separates with movable metal pattern 3, the goods that remain in the metal pattern die cavity 4 can be given prominence in metal pattern die cavity 4.
What reference symbol 16 was indicated is the used relative pressure vacuum meter of measuring in the metal pattern die cavity 4 of vacuum.This relative pressure vacuum meter 16 is to be that benchmark is measured the used vacuum meter of its relative vacuum with the atmospheric pressure.Reference symbol 17 is for measuring the outer used absolute pressure vacuum gage of atmospheric pressure of die casting machine.These relative pressure vacuum meters 16, absolute pressure vacuum gage 17 are connected with control device 18.
To describe control device 18 below.This control device 18 comprises the pressure input module 19 that is used to import the determination data of relative pressure vacuum meter 16 and absolute pressure vacuum gage 17 and constitutes input interface, the motion of control main vacuum pump 8 and backing vacuum pump 9, in addition, also control used pump control module 20 and scaler 22, machine interface 23, demonstration and the guidance panel 24 of action of electromagnetic actuators 10.These parts interconnect by bus 21.Scaler 22 comprises: compare scaler 25; Can store the storage part 26 of data; And the used output device 27 of output data between the bus 22; Control shows and the display part that watch-dog etc. is arranged of guidance panel 24, show with the used display unit 28 of several data such as moving situation data headed by the interior vacuum of metal pattern die cavity 4.From show, in the guidance panel 24 input metal pattern die cavitys 4 as the vacuum of target for example, absolute pressure 5hPa then can store these data in storage part 26.
To the action effect according to the die casting machine vacuum control unit of present embodiment be described below.
When the beginning casting process, at first utilize absolute pressure vacuum gage 17 to measure atmospheric pressure Pa.Then, will carry out the A/D conversion by pressure input module 19, be stored in the storage part 26 by bus 21 and as atmospheric pressure Pa from the atmospheric pressure measured signal of absolute pressure vacuum gage 17.In addition, start main vacuum pump 8 and backing vacuum pump 9.
Next, close movable metal pattern 3, be at two metal patterns under the state of matched moulds and begin to carry out the metallic solution jeting process with respect to fixing metal mould 2.Promptly as shown in Figure 1, supply with metallic solution from supply port 14 in spraying sleeve 13, the hydraulic cylinder that does not show among the figure is with before the 12a of plunger top portion and then will spray sleeve 13 interior metallic solutions and inject in the metal pattern die cavity 4.
Before the 12a of plunger top portion and then when stopping up supply port 14, the instruction of sending by control module 20 starts the electromagnetic actuators 10 of closing vacuum tube 5, thereby valve body 5a is travelled forward and opens gas exhaust piping.By above-mentioned steps, the negative pressure of main vacuum pump 8 makes metal pattern die cavity 4 begin decompression.
Therefore, along with beginning decompression, promptly utilize relative pressure vacuum meter 16 to measure the vacuum of metal pattern die cavity 4.The measured signal of the vacuum measured this moment is carried out the A/D conversion by pressure input module 19, enter in the control device 18, and be stored in the storage part 26 by bus 21 as relative vacuum degree Pr.
Relatively scaler 25 reads the data of atmospheric pressure Pa and relative pressure vacuum VPr from storage part 26, carries out atmospheric pressure Pa is worth by way of compensation and the value of relative pressure vacuum Pr is scaled the calculating of absolute pressure vacuum values Vpa.For example, if atmospheric pressure Pa is 1063hPa, the value of utilizing relative pressure vacuum meter 16 to measure as benchmark, becomes this 1063hPa-the relative pressure vacuum of 600hPa.Therefore, if atmospheric pressure Pa value is worth by way of compensation, then relative pressure vacuum can be converted to the absolute pressure vacuum values of 463hPa.When this data that are converted into the absolute pressure vacuum values are stored in the storage part 26 to display unit 28 carry and by show, the watch-dog of guidance panel 24 shows in real time.Therefore, if find this demonstration situation, then available absolute vacuum degree is held the decompression situation.Like this, the influence of the change of atmospheric pressure that weather etc. caused when although relative pressure vacuum meter 16 can be subjected to each, but can obtain atmospheric value by absolute pressure vacuum gage 17, and when using relative pressure vacuum meter 16, also can demonstrate atmospheric change atmospheric value that revise, correct.
Subsequently, the vacuums in the metal pattern die cavity 4 improve and steady change, reach the target vacuum degree if measure vacuum, and 20 of control modules are sent halt instruction and stopped decompression to main vacuum pump 8 and backing vacuum pump 9.Then, the valve body 5a that closes vacuum tube 5 retreats and closes gas exhaust piping.
Like this, the relative pressure vacuum that is subjected to by the atmospheric pressure influence of change of decisions such as weather is modified to the absolute pressure vacuum values, then the vacuum in the metal pattern die cavity can be decompressed to setting value.Then, after goods solidify, the drain valve that does not show among the figure is opened, opened fixing metal mould 2 and movable metal pattern 3 after metal pattern die cavity 4 is open into atmosphere.Then, push strut 15 actions stretch out the goods that remain in the metal pattern die cavity 4 in metal pattern die cavity 4, take out product, make circulation thereby finish one.
As mentioned above, owing to no longer be subjected to influence by the atmospheric pressure change of weather decision, therefore, vacuum in can be consistently that the casting good product is the required metal pattern die cavity is for example brought up to reliably and is suppressed at reliably under certain content for 5hPa and with gas content, thereby can produce high-quality cast article reliably.
But, back and forth carrying out above-mentioned casting circulation time, the determination data of vacuum is stored in the storage part 26 in the metal pattern die cavity 4 in the casting cycle before relevant last time.Like this, can use the vacuum desired value that adopts based on these vacuum data in the metal pattern die cavity 4 that comparison scaler 25 calculates.
For example, from storage part 26, read a vacuum value and a preceding again vacuum value when stablizing in the metal pattern die cavity 4 in casting circulation last time, these vacuum values are averaged conversion, and this mean value is set at the vacuum desired value in present cycle.
Under the situation of the vacuum in measuring metal pattern die cavity 4, pressure changes greatly when beginning to reduce pressure, and near decompression phase at the end, the pressure in the metal pattern die cavity 4 is more stable, therefore, a very short time of need just can correctly be measured the vacuum in the metal pattern die cavity 4.So, as mentioned above, use last time, the vacuum data in the end of a period stage of once reducing pressure before again, then can converse mean value etc. handles and gets rid of error, by with this mean value as desired value, then can back and forth cast circulation, vacuum is near certain value thereupon, thus but the precision of gas clean-up control.
Below, Fig. 2 illustrates the vacuum control unit according to second embodiment of the invention.
According to this second embodiment, main vacuum tank 6 links to each other with main vacuum pump 8, and main vacuum tank 6 has the capacity of abundant necessity of the capacity of relative metal pattern die cavity 4.This main vacuum tank 6 by design in main vacuum loop vacuum tube V1 and close vacuum tube 5 and be connected with metal pattern die cavity 4.Close vacuum tube 5 and be used to open and close the exhaust outlet of the main vacuum loop in the metal pattern die cavity 4.
Be provided with in the secondary vacuum loop of secondary vacuum tank 7 and also be provided with vacuum tube 2, this pair vacuum tank 7 both linked to each other with secondary vavuum pump 9, was connected with the gap at fixing metal mould 2 and internal fixation metal pattern 2a faying face place and the gap at movable metal pattern 3 and inner moveable metal pattern 3a faying face place by vacuum tube 2 again.
Like this, used vacuum meter S1, the S2 of relative vacuum degree that measures in the respective tank is installed in advance respectively in main vacuum tank 6 and secondary vacuum tank 7, these vacuum meters S1, S2 are linked to each other with the pressure input module 19 of control device 18.Vacuum tube V1, V2 are linked to each other with control module 20 and control on-off action by this control module 20.
To the effect of this embodiment be described below.
When casting process begins, at first utilize absolute pressure vacuum gage 17 to measure atmospheric pressure Pa.To be undertaken by bus 21 atmospheric pressure Pa being stored in the storage part 26 after the A/D conversion by pressure input module 19 from the atmospheric pressure measured signal of absolute pressure vacuum gage 17.In addition, the running by main vacuum pump 8 and secondary vavuum pump 9 is decompressed to determined vacuum with corresponding main vacuum tank 6 and secondary vacuum tank 7.
Next with respect to fixing metal mould 2 closed movable metal patterns 3, when two metal patterns are closed, vacuum tube V1 is opened by the instruction of sending from control module 20.At this moment, the valve body 5a maintenance of closing vacuum tube 5 is closed.In this stage, will be decompressed to the specified vacuum degree from vacuum tank 6 to the gas exhaust piping of closing vacuum tube 5.
Under this state, begin to carry out the metallic solution jeting process.Promptly in Fig. 2, supply with metallic solution from supply port 14 to spraying sleeve 13, the hydraulic cylinder and the 12a of plunger top portion that do not show among the figure move forward, thereby the metallic solution that will spray in the sleeve 13 is ejected in the metal pattern die cavity 4.
Before the 12a of plunger top portion and then when block supply port 14, send instruction and the electromagnetic actuators 10 of closing vacuum tube 5 is started from control module 20, thereby valve body 5a is advanced to open gas exhaust piping.Like this, the negative pressure by main vacuum tank 6 begins to make 4 decompressions of metal pattern die cavity.When main vacuum tank 6 reduces pressure, because having sufficient capacity and be decompressed to, main vacuum tank 6 closes vacuum tube 5 places, close vacuum tube 5 and move by the high electromagnetic actuators 10 of responsiveness, thereby, can make metal pattern die cavity 4 explosive decompressions by closing opening of vacuum tube 5.
Along with the beginning of decompression, similarly to Example 1, carry out the vacuum of measuring metal pattern die cavity 4 by relative pressure vacuum meter 16.
Then, the vacuums in the metal pattern die cavity 4 uprise and the vacuum smooth change consistent until the vacuum measured value with target vacuum degree value.Under the situation that arrives this target vacuum degree, send instruction by control module 20, then close vacuum tube V1, thereby stop decompression along with the opening of valve body 5a of closing vacuum tube 5.Then, the drain valve that does not show among the figure is opened and metal pattern die cavity 4 is open into atmosphere.
After product solidifies, metal pattern is opened.Metal pattern die cavity 4 is being open under the situation of atmosphere, fixing metal mould 2 and movable metal pattern are opened swimmingly and is being made push strut 15 actions, product residual in the metal pattern die cavity 4 is being taken out and finishing the casting circulation.
In the process that above-mentioned casting circulation is carried out repeatedly, the vacuum determination data before last time in the metal pattern die cavity 4 of casting circulation all is stored in the storage part 26.Like this, identical with first embodiment, just can be with based on these vacuum data, the value of calculating by scaler 25 relatively becomes the vacuum desired value in the used metal pattern die cavity 4.As this desired value preferably, for example, the vacuum value that reads from storage part 26 when stablizing in the metal pattern die cavity 4 in casting circulation last time reaches a preceding again vacuum value etc., these vacuum values is averaged conversion, and this mean value is set at present vacuum desired value.
Further, in with 4 decompressions of metal pattern die cavity, open vacuum tube V2 by secondary vacuum tank 7, thereby the gap at fixing metal mould and internal fixation metal pattern 2a faying face place and movable metal pattern 3 are reduced pressure with the gap at internal fixation metal pattern 3a faying face place, can prevent then that by this operation air from entering into metal pattern die cavity 4 from faying face.The vacuum desired value at this faying face place is identical with the vacuum of main vacuum tank 6, or is set to suitable value according to the needs of test.In addition, the switching time of vacuum tube 2 can carry out simultaneously with vacuum tube V1, also can carry out suitable change according to the result of test.
Claims (9)
1, a kind of die casting machine vacuum control unit that makes decompression in the die cavity that is formed by fixing metal mould and movable metal pattern and form is characterized in that, comprising:
Vacuum loop, this vacuum loop contain makes the used vavuum pump of aforementioned die cavity inner pressure relief;
Detect the used device of die casting machine external pressure;
With above-mentioned atmospheric pressure is that benchmark is measured the used relative pressure vacuum meter of relative vacuum pressure in the above-mentioned die cavity;
Read the determination data of above-mentioned relative pressure vacuum meter and atmospheric value is worth by way of compensation and will be converted to the used scaler of absolute pressure vacuum values by the vacuum pressure value that above-mentioned relative pressure vacuum meter is measured;
On display, show the used vacuum display unit of described absolute pressure vacuum values.
2, die casting machine vacuum control unit according to claim 1 is characterized in that: this device is also arranged and is promisingly made vacuum in the die cavity in the formed thereby become absolute pressure vacuum values arbitrarily and control the used apparatus for controlling pump of motion of described vavuum pump.
3, die casting machine vacuum control unit according to claim 1, it is characterized in that: this device also is furnished with the used apparatus for controlling pump of motion of the aforementioned vavuum pump of control, so that the vacuum in the die cavity in being shaped at present is consistent with the vacuum desired value of calculating based on the absolute pressure vacuum values data in the above-mentioned die cavity of being measured in the shaping before casting circulation last time.
4, a kind of die casting machine vacuum control unit that reduces pressure in the die cavity that is formed by fixing metal mould and movable metal pattern to form that makes is characterized in that comprising:
Detect the used device of die casting machine external pressure;
With above-mentioned atmospheric pressure is that benchmark is measured the used relative pressure vacuum meter of relative vacuum pressure in the above-mentioned die cavity;
Vacuum loop, the vacuum tube that is furnished with vacuum meter in the used case of vacuum in the vacuum tank, vavuum pump, the aforementioned vacuum tank of mensuration in this vacuum loop, the gas exhaust piping switching station that is connected with aforementioned vacuum tank and aforementioned die cavity is used;
Read the determination data of above-mentioned relative pressure vacuum meter and atmospheric value is worth by way of compensation and will be converted to the used scaler of absolute pressure vacuum values by the vacuum pressure value that above-mentioned relative pressure vacuum meter is measured;
On display, show the used vacuum display unit of described absolute pressure vacuum values;
The motion of control vavuum pump is to remain the vacuum in the aforementioned vacuum tank the used apparatus for controlling pump of specified vacuum degree;
The vacuum tube control device of in forming process, opening aforementioned vacuum tube and making aforementioned die cavity and described vacuum tank be connected used;
By aforementioned vacuum tank it is decompressed to the absolute pressure vacuum values of defined when utilizing aforementioned relative pressure vacuum meter to measure the vacuum in the die cavity.
5, die casting machine vacuum control unit according to claim 4 is characterized in that: the vacuum desired value of the absolute pressure vacuum values of aforementioned defined for calculating based on absolute pressure vacuum values data in the aforementioned die cavity of being measured in the shaping before casting cycle last time.
6, die casting machine vacuum control unit according to claim 4 is characterized in that:
Aforementioned vacuum loop also have in above-mentioned die cavity the exhaust outlet that opens and closes gas exhaust piping used close vacuum tube.
7, die casting machine vacuum control unit according to claim 5 is characterized in that: the above-mentioned vacuum tube of closing is furnished with and makes the valve body that the gas exhaust piping switching station uses and make described valve body used electromagnetic actuators of moving linearly in opening and closing direction.
8, according to claim 4 or 5 described die casting machine vacuum control units, it is characterized in that: described vacuum loop is furnished with secondary vacuum loop, has the used vacuum tank and the vavuum pump of faying face place decompression of interior metal mould in the faying face place that makes interior metal mould in the fixing metal mould and the movable metal pattern in this pair vacuum loop.
9, a kind of when beginning to cast, after making the inner pressure relief of metal die cavity in advance, in same metal die cavity, inject the evacuated die-casting process method of metallic solution, it is characterized in that, comprise following operation:
Measure the operation of die casting machine around atmospheric pressure in advance;
When the aforementioned metal mould is closed, in die cavity, inject the operation of metallic solution;
When in the metal pattern die cavity, injecting metallic solution used vacuum determinator atmospheric measurement result is fed back and atmospheric pressure is worth by way of compensation and utilize aforementioned relative pressure vacuum meter to measure the absolute pressure vacuum values of metal pattern die cavity in reduce the operation of metal pattern die cavity internal pressure;
After stopping to reduce pressure with die cavity to atmosphere opening and open the operation of metal pattern.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP179026/04 | 2004-06-17 | ||
| JP2004179026 | 2004-06-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1709613A CN1709613A (en) | 2005-12-21 |
| CN1325202C true CN1325202C (en) | 2007-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100837657A Active CN1325202C (en) | 2004-06-17 | 2005-06-17 | Vacuum control device for press caster and method thereof |
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|---|---|
| KR (1) | KR100707540B1 (en) |
| CN (1) | CN1325202C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433422A (en) * | 2010-09-29 | 2012-05-02 | 沈阳黎明航空发动机(集团)有限责任公司 | Model correcting method for high-temperature alloy thin-wall casting |
| CN102145381B (en) * | 2010-02-09 | 2012-06-20 | 广东鸿泰科技股份有限公司 | Vacuum apparatus used for high vacuum die casting |
| CN105414515A (en) * | 2015-11-26 | 2016-03-23 | 广东鸿图科技股份有限公司 | Die-casting mechanism of horizontal freezing chamber vacuum die-casting machine and method for using die-casting mechanism for die-casting operation |
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| CN102699309B (en) * | 2012-06-08 | 2014-01-15 | 重庆大学 | Die-casting vacuumizing passage check device |
| EP3299097B1 (en) | 2015-05-22 | 2019-07-03 | Nissan Motor Co., Ltd. | Suction pressure casting method |
| JP6707718B1 (en) | 2018-09-21 | 2020-06-10 | 本田技研工業株式会社 | Die casting mold and its depressurization path conductance setting method |
| CN111266550A (en) * | 2020-03-16 | 2020-06-12 | 东莞宜安科技股份有限公司 | High vacuum die casting die |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102145381B (en) * | 2010-02-09 | 2012-06-20 | 广东鸿泰科技股份有限公司 | Vacuum apparatus used for high vacuum die casting |
| CN102433422A (en) * | 2010-09-29 | 2012-05-02 | 沈阳黎明航空发动机(集团)有限责任公司 | Model correcting method for high-temperature alloy thin-wall casting |
| CN105414515A (en) * | 2015-11-26 | 2016-03-23 | 广东鸿图科技股份有限公司 | Die-casting mechanism of horizontal freezing chamber vacuum die-casting machine and method for using die-casting mechanism for die-casting operation |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100707540B1 (en) | 2007-04-13 |
| KR20060049224A (en) | 2006-05-18 |
| CN1709613A (en) | 2005-12-21 |
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