CN105300834A - Device and method for measuring air content in die castings - Google Patents
Device and method for measuring air content in die castings Download PDFInfo
- Publication number
- CN105300834A CN105300834A CN201510847071.XA CN201510847071A CN105300834A CN 105300834 A CN105300834 A CN 105300834A CN 201510847071 A CN201510847071 A CN 201510847071A CN 105300834 A CN105300834 A CN 105300834A
- Authority
- CN
- China
- Prior art keywords
- stop valve
- vacuum
- vacuum chamber
- air
- pump set
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses a device for measuring air content in die castings. The device comprises a heating system, a vacuum system and a quantitative air feed system, wherein the heating system comprises a heating furnace and a crucible; the vacuum system comprises a vacuum chamber, a first stop valve, a second stop valve, an oil diffusion pump, a first stop valve, a third stop valve, a fourth stop valve, a mechanical pump and a first vacuometer; the vacuum chamber is connected with a temperature measuring thermocouple; a fifth stop valve is further arranged between the first vacuometer and the first stop valve, and communicated with the outside atmosphere through a first air communicating pipe; the quantitative air feed system comprises a seventh stop valve, a first quantifying pipe, a ninth stop valve, a second quantifying pipe and a tenth stop valve. The device can quickly and accurately measure the air content in the die castings and is simple and convenient to operate.
Description
Technical field
The invention belongs to die-casting technique field, more specifically, relate to a kind of apparatus and method measuring inside die-casting part air content.
Background technology
It is pour in the pressure chamber of die casting machine by the alloy liquid of melting that pressure casting is shaped, and is then pressed in metal die die cavity at a high speed by molten metal by drift, thus casts out the part with definite shape and size.Due in press casting procedure, molten metal is with high speed and high pressure state filling mold cavity, and a large amount of gases in mold cavity have little time discharge and be involved in wherein by the molten metal of turbulent flow and become gas hole defect.In addition be dissolved with hydrogen in addition in molten metal, hydrogen reduces because of the temperature of molten metal, and the solubleness in molten metal declines and separates out, if the hydrogen of separating out has little time to discharge and remains in cast-internal and also can form pore.Therefore pore is the modal defect of die casting, and the existence of pore not only reduces the effective bearing area of die casting, and can cause stress raisers, becomes the formation of crack of diecast parts fracture.Some pores in irregular shape, also can increase the susceptibility of breach, the intensity of metal are declined and anti-fatigue ability reduction.
The common method detecting inside die-casting part gas hole defect has ultrasound wave, X-ray nondestructive examination, densimetry etc.Although by pore size judge come indirect assessment cast-internal air content number, accurately cannot determine the gas content of cast-internal.Patent " measuring gas contents in die castings of aluminum alloy by vacuum means apparatus and method " (application number: 86105181) invented a kind of device calculating gas content in foundry goods according to equation for ideal gases.But owing to measuring the parameter influence such as the temperature in region and the fluctuation of gas density, the quantitative metrical error of the method is larger.Patent 2013100809149 invention calculates method and the device of cast-internal air content according to the pressure differential of vacuum chamber and the normal pressure curve of correspondence before and after aluminium casting fusing, and this is a kind of simple and practical quantitative detecting method and device.But foundry goods temperature of fusion is different when this device is not considered to measure at every turn, thus the typical curve of its correspondence is also different.If cannot corresponding actual temperature state (if actual temperature is 660 DEG C) at that time, and adopt fixed temperature (as 650 or 700 DEG C) typical curve to calculate, then can bring larger measuring error.In addition, always there is leakage, especially high vacuum system in vacuum system.Patent 2013100809149 does not consider the impact of system leak in measuring process, if that is the mensuration process of typical curve with foundry goods fusion process not in same seal process, because the system leak amount of two processes is different, thus cause measuring and also can produce larger error.Generally speaking, in the method and device development of quantitative measurement inside die-casting part air content, there is very large deficiency at present, measuring accuracy and device reliability are all poor.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of apparatus and method measuring inside die-casting part air content, solve Yin Wendu and the inconsistent measuring error problem brought of leakage in measuring process, there is higher measuring accuracy and reliability, the gas hole defect in foundry goods and internal soundness can be evaluated exactly.
For achieving the above object, according to one aspect of the present invention, provide a kind of device measuring inside die-casting part air content, it is characterized in that, comprise heating system, vacuum system and quantitative air supply system, wherein,
Described heating system comprises heating furnace and crucible, and described crucible is positioned at described heating furnace;
Described vacuum system comprises vacuum pump set, vacuum chamber and the first vacuum meter, described vacuum pump set comprises the first stop valve, the second stop valve, ODP, the 3rd stop valve, the 4th stop valve and mechanical pump, and the lower end of described vacuum chamber to be stretched in described heating furnace and in vacuum chamber, placed described crucible; Described vacuum chamber connects described first stop valve by vacuum chamber connecting pipe, described first stop valve connects described second stop valve and the 4th stop valve respectively, one end away from the first stop valve of described 4th stop valve is connected with described mechanical pump, described second stop valve connects described ODP, the 3rd stop valve and mechanical pump successively away from one end of the first stop valve, described vacuum chamber connecting pipe stretches in described vacuum chamber away from one end of the first stop valve, described vacuum chamber connecting pipe arranges described first vacuum meter, for the vacuum tightness measured in vacuum chamber;
Described vacuum chamber is provided with temperature thermocouple, for the temperature measured in described vacuum chamber;
Be provided with the 5th stop valve between described first vacuum meter and described first stop valve, described 5th stop valve is connected with the first air communication pipe, the inner chamber of described first air communication pipe is communicated with outside atmosphere;
Be provided with the 6th stop valve between described first stop valve and described second stop valve, described 6th stop valve is connected with the second air communication pipe, the lumen outer air of described second air communication pipe is communicated with;
Described quantitative air supply system comprises the 7th stop valve, first quantity tube, 8th stop valve, 9th stop valve, second quantity tube, tenth stop valve, described 7th stop valve and the 9th stop valve are connected on described vacuum chamber connecting pipe, described 7th stop valve connects described first quantity tube and the 8th stop valve successively, described 9th stop valve connects described second quantity tube and the tenth stop valve successively, described 8th stop valve is linked together by connecting tube away from one end of the first quantity tube and described tenth stop valve one end away from the second quantity tube, and connecting tube is provided with the 3rd air communication pipe, the inner chamber of described 3rd air communication pipe is communicated with outside atmosphere.
Preferably, the second vacuum meter is provided with between described first stop valve and described second stop valve.
Preferably, be provided with the 11 stop valve between described 3rd stop valve and described mechanical pump, described 11 stop valve is connected with the 4th air communication pipe, the inner chamber of described 4th air communication pipe is communicated with outside atmosphere.
Preferably, described second quantity tube volume is more than 10 times of the first quantity tube volume.
According to another aspect of the present invention, additionally provide a kind of method utilizing said apparatus to measure cast-internal air content, it is characterized in that: comprise the following steps:
(1), the measurement of vacuum tightness in foundry goods fusion process, comprise following sub-step:
(1.1) foundry goods to be measured is put into sodium hydroxide solution 1 ~ 1.5 minute, after washing, to immerse in nitric acid 30 ~ 50 seconds, clean with water, alcohol and acetone successively, then be dried; After its drying, weigh with scale, record casting weight m.
(1.2) all stop valves are closed, then the foundry goods to be measured after weighing is put in the crucible in vacuum chamber, and vacuum chamber is sealed;
(1.3) open the first stop valve in vacuum pump set, the second stop valve, the 3rd stop valve and the 4th stop valve, utilize vacuum pump set to vacuumize vacuum chamber, make the vacuum tightness in vacuum chamber reach setting value;
(1.4) treat that the vacuum tightness in vacuum chamber reaches setting value P
0after, close the first stop valve of vacuum pump set; Meanwhile, the operation of vacuum pump set is stopped and timing of starting from scratch;
(1.5) keep inside heating furnace temperature to maintain design temperature T, foundry goods to be measured is melted;
(1.6) at time t
1time, record the pressure value P of now vacuum chamber
3;
(1.7) open the 5th stop valve, the first stop valve and the 6th stop valve, vacuum chamber is communicated with air, make heating in-furnace temperature maintain design temperature T simultaneously;
(1.8) all stop valves of the front opening of closedown, make vacuum chamber and air disconnect, make heating in-furnace temperature maintain design temperature T simultaneously;
(2), first quantitative gas release after vacuum measurement, comprise following sub-step:
(2.1) open the first stop valve in vacuum pump set, the second stop valve, the 3rd stop valve and the 4th stop valve, utilize vacuum pump set to vacuumize vacuum chamber, make the vacuum tightness in vacuum chamber reach setting value;
(2.2) treat that the vacuum tightness in vacuum chamber reaches setting value P
0after, close the first stop valve in vacuum pump set; Meanwhile, the operation of vacuum pump set is stopped and timing of starting from scratch.
(2.3) at time t
1when/2, open the 8th stop valve, the first quantity tube and air are communicated, then close the 8th stop valve;
(2.4) open the 7th stop valve, the first quantity tube and vacuum chamber are communicated, then close the 7th stop valve;
(2.5) at time t
1time, record the pressure value P of now vacuum chamber
1;
(2.6) open the 5th stop valve, the first stop valve and the 6th stop valve, keep vacuum chamber to communicate with air, make heating in-furnace temperature maintain design temperature T simultaneously;
(2.7) all stop valves of the front opening of closedown, make vacuum chamber and air disconnect, make heating in-furnace temperature maintain design temperature T simultaneously;
(3), second quantitative gas release after vacuum measurement, comprise following sub-step:
(3.1) open the first stop valve in vacuum pump set, the second stop valve, the 3rd stop valve and the 4th stop valve, utilize vacuum pump set to vacuumize vacuum chamber, make the vacuum tightness in vacuum chamber reach setting value;
(3.2) treat that the vacuum tightness in vacuum chamber reaches setting value P
0after, close the first stop valve in vacuum pump set; Meanwhile, the operation of vacuum pump set is stopped and timing of starting from scratch.
(3.3) at time t
1when/2, open the tenth stop valve, the second quantity tube and air are communicated, then close the tenth stop valve;
(3.4) open the 9th stop valve, the second quantity tube and vacuum chamber are communicated, then close the 9th stop valve;
(3.5) at time t
1time, record the pressure value P of now vacuum chamber
2;
(3.6) open the 5th stop valve, the first stop valve and the 6th stop valve, vacuum chamber is communicated with air, and then all stop valves of the front opening of closedown;
(4), the calculating of air content, comprise following sub-step:
(4.1) P measuring and obtain is utilized
1, P
2, P
3, and the volume V of the first quantity tube
1, the second quantity tube volume V
2, obtain the gas volume V in cast-internal
3:
(4.2) by V
3obtain the air content V=V of cast-internal
3/ m.
Preferably, the setting value P of described vacuum tightness
0≤ 0.01Pa.
In general, the above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial effect:
1) the present invention can automatically, the gas content of Fast Measurement aluminum alloy die casting inside, quick and easy.
2) the present invention is by the Accurate Determining of gas content size, for quantitative evaluation Internal Quality of Cast provides reference frame.
3) the present invention is by the Accurate Determining of gas content size, and can the automobile structure for high vacuum die casting production heat-treat and provide quantitative judgement foundation, is conducive to high vacuum die casting technological parameter as the design of vacuum tightness etc. and optimization.
In a word, this method and device solve Yin Wendu and the inconsistent measuring error problem brought of leakage in measuring process, have higher measuring accuracy and reliability, can evaluate the gas hole defect in foundry goods and internal soundness exactly.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention;
Fig. 2 is surveying work process flow diagram of the present invention.
In figure: 1-heating furnace 2-vacuum chamber 3-die casting 4-to be measured crucible 5-temperature thermocouple
6-first vacuum meter 7-the 5th stop valve 8-first stop valve 9-first vacuum meter
10-the 6th stop valve 11-second stop valve 12-ODP 13-the 3rd stop valve
14-the 4th stop valve 15-mechanical pump 16-the 11 stop valve 17-the 7th stop valve
18-first quantity tube 19-the 8th stop valve 20-the 9th stop valve
21-second quantity tube 22-the tenth stop valve 23-quantitative air supply system 24-vacuum pump set
25-vacuum chamber connecting pipe
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
With reference to Fig. 1, Fig. 2, a kind of device measuring inside die-casting part air content, is characterized in that, comprises heating system, vacuum system and quantitative air supply system 23, wherein,
Described heating system comprises heating furnace 1 and crucible 4, and described crucible 4 is positioned at described heating furnace 1;
Described vacuum system comprises vacuum pump set 24, vacuum chamber 2 and the first vacuum meter 6, described vacuum pump set 24 comprises the first stop valve 8, ODP 12, second stop valve 11, the 3rd stop valve 13, the 4th stop valve 14 and mechanical pump 15, the lower end of described vacuum chamber 2 to stretch in described heating furnace 1 and vacuum chamber 2 in the described crucible 4 of placement, described vacuum chamber 2 connects described first stop valve 8 by vacuum chamber connecting pipe 25, described first stop valve 8 connects described second stop valve 11 and the 4th stop valve 14 respectively, one end away from the first stop valve 8 of described 4th stop valve 14 is connected with described mechanical pump 15, described second stop valve 11 connects described ODP 12 successively away from one end of the first stop valve 8, 3rd stop valve 13 and mechanical pump 15, described vacuum chamber connecting pipe 25 stretches in described vacuum chamber 2 away from one end of the first stop valve 8, described vacuum chamber connecting pipe 25 is arranged described first vacuum meter 6, for the vacuum tightness measured in vacuum chamber 2,
Described vacuum chamber 2 is provided with temperature thermocouple 5, for the temperature measured in described vacuum chamber 2;
Be provided with the 5th stop valve 7 between described first vacuum meter 6 and described first stop valve 8, described 5th stop valve 7 is connected with the first air communication pipe, the inner chamber of described first air communication pipe is communicated with outside atmosphere;
Be provided with the 6th stop valve 10 between described first stop valve 8 and described second stop valve 11, described 6th stop valve 10 is connected with the second air communication pipe, the lumen outer air of described second air communication pipe is communicated with; Preferably, the second vacuum meter 9 is provided with between described first stop valve 8 and described second stop valve 11.
Described quantitative air supply system 23 comprises the 7th stop valve 17, first quantity tube 18, 8th stop valve 19, 9th stop valve 20, second quantity tube 21, tenth stop valve 22, described 7th stop valve 17 and the 9th stop valve 20 are connected on described vacuum chamber connecting pipe 25, described 7th stop valve 17 connects described first quantity tube 18 and the 8th stop valve 19 successively, described 9th stop valve 20 connects described second quantity tube 21 and the tenth stop valve 22 successively, described 8th stop valve 19 is linked together by connecting tube away from one end of the first quantity tube 18 and described tenth stop valve 22 one end away from the second quantity tube 21, and connecting tube is provided with the 3rd air communication pipe, the inner chamber of described 3rd air communication pipe is communicated with outside atmosphere.Preferably, described second quantity tube 21 volume is more than 10 times of the first quantity tube 18 volume, and the reason of more than 10 times is after ensureing gas inject, and the pressure change under two kinds of volume conditions in vacuum chamber obviously, is convenient to differentiate.
Further, be provided with the 11 stop valve 16, described 11 stop valve 16 is connected with the 4th air communication pipe between described 3rd stop valve 13 and described mechanical pump 15, the inner chamber of described 4th air communication pipe is communicated with outside atmosphere.
For the working pressure in guarantee vacuum chamber 2 is at below 0.01Pa, vacuum pump set 24 is made up of ODP 12 and mechanical pump 15 for this reason, and wherein ODP 12 is main pump, and connecting with mechanical pump 15 uses.Whole vacuum pump set 24 is connected with vacuum chamber 2 by vacuum chamber connecting pipe 25, is controlled the break-make of each vacuum tube by the 5th stop valve 7 to the 11 stop valve 16.When utilizing vacuum pump set 24 pairs of vacuum chambers 2 to vacuumize, first should open the first stop valve 8 and the 4th stop valve 14, start mechanical pump 15 pairs of vacuum chambers 2 slightly to take out, after the force value of the second vacuum meter 9 display is stable, first close the 4th stop valve 14, then open the second stop valve 11 and the 3rd stop valve 13 and ODP 11.After vacuumizing end, close the first stop valve 8, second stop valve 11 and the 3rd stop valve 13 and ODP 11 in order, then close mechanical pump 15, open the 11 stop valve 16, to make the front and back pressure reduction of mechanical pump for 0 simultaneously.
Principle of work of the present invention is, in same airtight container, the gas successively measuring the vacuum tightness after foundry goods fusing and different volumes (volume is known) enters the vacuum tightness after airtight container, then utilizes the relation of vacuum tightness linear change to calculate gas content in foundry goods.Detailed process is: the die casting of constant weight (0.1 ~ 1.0Kg) is put into the container being heated to uniform temperature (650 ~ 700 DEG C) and vacuum chamber, and sealing is also quick to vacuum chamber, reaches setting vacuum tightness P in its vacuum tightness
0after, stop vacuumizing in vacuum chamber starting timing simultaneously.Foundry goods melts in airtight vacuum chamber, discharges gas, the vacuum tightness change in vacuum chamber.Melt completely at foundry goods and reach setting-up time t
1time, record the vacuum tightness P in now vacuum chamber
3.Subsequently to injecting air in vacuum chamber and being communicated with atmospheric environment, keep atmospheric environment (vacuum chamber continues insulation).Then closing vacuum chamber, fast to container vacuum-pumping, reaches above-mentioned setting vacuum tightness P in its vacuum tightness equally
0after, stop vacuumizing in vacuum chamber starting timing simultaneously.Reaching aforementioned setting-up time t
1a half, discharge certain volume V to vacuum chamber
1air, vacuum chamber keep aforementioned temperature constant.Setting-up time t to be achieved
1time, record the vacuum tightness P in now vacuum chamber
1.Then in vacuum chamber, inject again air and be communicated with atmospheric environment, keeping atmospheric environment (vacuum chamber continues insulation).3rd closing vacuum chamber, fast to container vacuum-pumping, reaches above-mentioned setting vacuum tightness P in its vacuum tightness
0after, stop vacuumizing in vacuum chamber starting timing simultaneously.Reaching aforementioned setting-up time t
1a half, discharge certain volume V to vacuum chamber
2air, vacuum chamber keep aforementioned temperature constant.Aforementioned same setting-up time t to be achieved
1time, record the vacuum tightness P in now vacuum chamber
2.By the P obtained in above-mentioned measuring process
1, P
2, P
3with the first known quantity tube volume V
1with the second quantity tube volume V
2, the gas volume V of cast-internal release can be calculated
3.
Heating furnace of the present invention, as a thermal source, mainly provides the heat needed for melting aluminum alloy pressuring casting, and to make in vacuum chamber temperature constant and foundry goods temperature of fusion certain.Vacuum system is mainly made up of vacuum chamber, the first vacuum meter, thermopair and vacuum pump set.Below setting vacuum tightness for example below 0.01Pa is reached in order to make the pressure in vacuum chamber, vacuum pump combination and the first to the 11 stop valve is comprised in vacuum pump set, wherein ODP is main pump, and mechanical pump is roughing vacuum pump, and the first to the 11 stop valve controls the break-make of each vacuum-pumping pipeline.Two quantity tubes, the 7th to the tenth stop valve that quantitative air supply system differs 10 times by volume are formed.
As shown in Figure 2, measuring process of the present invention is as follows:
1, the vacuum measurement in foundry goods fusion process
(1.1) part 3 to be measured is put into sodium hydroxide solution 1 ~ 1.5 minute, after washing, to immerse in nitric acid 30 ~ 50 seconds, clean with water, alcohol and acetone successively, drier to its blowing.After its drying, weigh with scale, record casting weight m (unit: g).
(1.2) part to be measured after weighing is put into and is placed in the crucible 4 of vacuum chamber 2, and seal.
(1.3) utilize vacuum pump set 24 pairs of vacuum chambers 2 to vacuumize, make the vacuum tightness in vacuum chamber 2 reach setting value.
(1.4) treat that the vacuum tightness in vacuum chamber reaches setting value P
0after, close the first stop valve 8 in vacuum pump set 24, disconnect vacuum pump set 24 and be directly connected with vacuum chamber 2.Meanwhile, the operation of vacuum pump set 24 is stopped and timing of starting from scratch.
(1.5) keep vacuum chamber 2 airtight, heating furnace 1 remains on design temperature, and part 3 to be measured is melted, and this temperature is maintained to whole test process and terminates.
(1.6) setting-up time t to be achieved
1time, record the pressure value P of now vacuum chamber 2
3.
(1.7) open the 5th stop valve 7, first stop valve 8 and the 6th stop valve 10, maintenance vacuum chamber, vacuum line communicate (furnace temp maintenance) with air.
(1.8) all stop valves of the front opening of closedown, make vacuum chamber, vacuum line and air disconnect (furnace temp keeps).
2, the vacuum measurement after the first quantitative gas release
(2.1) utilize vacuum pump set 24 pairs of vacuum chambers 2 to vacuumize, make the vacuum tightness in vacuum chamber 2 reach setting value.
(2.2) treat that the vacuum tightness in vacuum chamber reaches setting value P
0after, close the first stop valve 8 in vacuum pump set 24, disconnect vacuum pump set 24 and be directly connected with vacuum chamber 2.Meanwhile, the operation of vacuum pump set 24 is stopped and timing of starting from scratch.
(2.3) setting-up time t to be achieved
1when/2, open the 8th stop valve 19, (volume is known, V to make the first quantity tube 18
1, unit: ml) and air communicate, then close the 8th stop valve 19.
(2.4) open the 7th stop valve 17, the first quantity tube 18 and vacuum chamber 2 are communicated, then close the 7th stop valve 17.
(2.5) setting-up time t to be achieved
1time, record the pressure value P of now vacuum chamber 2
1.
(2.6) open the 5th stop valve 7, first stop valve 8 and the 6th stop valve 10, maintenance vacuum chamber 2, vacuum line communicate (furnace temp maintenance) with air.
(2.7) all stop valves of the front opening of closedown, make vacuum chamber 2, vacuum line and air disconnect (furnace temp keeps).
3, the vacuum measurement after the second quantitative gas release
(3.1) utilize vacuum pump set 24 pairs of vacuum chambers 2 to vacuumize, make the vacuum tightness in vacuum chamber 2 reach setting value.
(3.2) treat that the vacuum tightness in vacuum chamber reaches setting value P
0after, close the first stop valve 8 in vacuum pump set 24, disconnect vacuum pump set 24 and be directly connected with vacuum chamber 2.Meanwhile, the operation of vacuum pump set 24 is stopped and timing of starting from scratch.
(3.3) setting-up time t to be achieved
1when/2, open the tenth stop valve 22, make the second quantity tube 21 (volume V
2, known, unit: ml) and air communicate, then close the tenth stop valve 22.
(3.4) open the 9th stop valve 20, the second quantity tube 20 and vacuum chamber 2 are communicated, then close the 9th stop valve 20.
(3.5) setting-up time t to be achieved
1time, record the pressure value P of now vacuum chamber 2
2.
(3.6) open the 5th stop valve 7 and the 6th stop valve 10, maintenance vacuum chamber, vacuum line communicate with air, all stop valves of the front opening of then closedown;
4, the calculating of air content
(4.1) P measuring and obtain is utilized
1, P
2, P
3with known V
1, V
2and the linear relationship between three, calculate the gas volume V in cast-internal
3(unit: ml).
(4.2) by V
3calculate the air content V=V of cast-internal
3/ m (unit: ml/g)
Embodiment 1
2800KN horizontal type cold-chamber die casting carries out common die casting and evacuated die-casting process to AlSi10Mg alloy, and utilize this device to carry out air content test to the part obtained, contrast test result is as shown in table 1.
The air content (ml/100g) of the table common die casting of 1AlSi10Mg alloy and evacuated die-casting process part
As can be seen from Table 1, the gas content in Vacuum Pressure foundry goods is significantly less than antivacuum common die casting, quantitatively verifies Vacuum Pressure Internal Quality of Cast and is better than common die casting, for process optimization provides reference frame.
Embodiment 2
Cut by Vacuum Pressure foundry goods each several part, respectively part part, material cake and overflow groove are carried out air content test, test result is as shown in table 2.
The air content (ml/100g) of table 2 die casting each several part
As can be seen from Table 2, even adopt evacuated die-casting process, the different local air content of die casting is also different, and the air content simultaneously demonstrating foundry goods body is less than material cake, and expects that the air content of cake part is less than overflow groove.This exploitation being structural member and assessment provide solid reference.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. measure a device for inside die-casting part air content, it is characterized in that, comprise heating system, vacuum system and quantitative air supply system, wherein,
Described heating system comprises heating furnace and crucible, and described crucible is positioned at described heating furnace;
Described vacuum system comprises vacuum pump set, vacuum chamber and the first vacuum meter, described vacuum pump set comprises the first stop valve, the second stop valve, ODP, the 3rd stop valve, the 4th stop valve and mechanical pump, and the lower end of described vacuum chamber to be stretched in described heating furnace and in vacuum chamber, placed described crucible; Described vacuum chamber connects described first stop valve by vacuum chamber connecting pipe, described first stop valve connects described second stop valve and the 4th stop valve respectively, one end away from the first stop valve of described 4th stop valve is connected with described mechanical pump, described second stop valve connects described ODP, the 3rd stop valve and mechanical pump successively away from one end of the first stop valve, described vacuum chamber connecting pipe stretches in described vacuum chamber away from one end of the first stop valve, described vacuum chamber connecting pipe arranges described first vacuum meter, for the vacuum tightness measured in vacuum chamber;
Described vacuum chamber is provided with temperature thermocouple, for the temperature measured in described vacuum chamber;
Be provided with the 5th stop valve between described first vacuum meter and described first stop valve, described 5th stop valve is connected with the first air communication pipe, the inner chamber of described first air communication pipe is communicated with outside atmosphere;
Be provided with the 6th stop valve between described first stop valve and described second stop valve, described 6th stop valve is connected with the second air communication pipe, the lumen outer air of described second air communication pipe is communicated with;
Described quantitative air supply system comprises the 7th stop valve, first quantity tube, 8th stop valve, 9th stop valve, second quantity tube, tenth stop valve, described 7th stop valve and the 9th stop valve are connected on described vacuum chamber connecting pipe, described 7th stop valve connects described first quantity tube and the 8th stop valve successively, described 9th stop valve connects described second quantity tube and the tenth stop valve successively, described 8th stop valve is linked together by connecting tube away from one end of the first quantity tube and described tenth stop valve one end away from the second quantity tube, and connecting tube is provided with the 3rd air communication pipe, the inner chamber of described 3rd air communication pipe is communicated with outside atmosphere.
2. a kind of device measuring inside die-casting part air content according to claim 1, is characterized in that, is provided with the second vacuum meter between described first stop valve and described second stop valve.
3. a kind of device measuring inside die-casting part air content according to claim 1, it is characterized in that, the 11 stop valve is provided with between described 3rd stop valve and described mechanical pump, described 11 stop valve is connected with the 4th air communication pipe, and the inner chamber of described 4th air communication pipe is communicated with outside atmosphere.
4. a kind of device measuring inside die-casting part air content according to claim 1, is characterized in that, described second quantity tube volume is more than 10 times of the first quantity tube volume.
5. utilize a method for measurement device cast-internal air content described in arbitrary claim in claim 1 ~ 4, it is characterized in that: comprise the following steps:
(1), the measurement of vacuum tightness in foundry goods fusion process, comprise following sub-step:
(1.1) foundry goods to be measured is put into sodium hydroxide solution 1 ~ 1.5 minute, after washing, to immerse in nitric acid 30 ~ 50 seconds, clean with water, alcohol and acetone successively, then be dried; After its drying, weigh with scale, record casting weight m.
(1.2) all stop valves are closed, then the foundry goods to be measured after weighing is put in the crucible in vacuum chamber, and vacuum chamber is sealed;
(1.3) open the first stop valve in vacuum pump set, the second stop valve, the 3rd stop valve and the 4th stop valve, utilize vacuum pump set to vacuumize vacuum chamber, make the vacuum tightness in vacuum chamber reach setting value;
(1.4) treat that the vacuum tightness in vacuum chamber reaches setting value P
0after, close the first stop valve of vacuum pump set; Meanwhile, the operation of vacuum pump set is stopped and timing of starting from scratch;
(1.5) keep inside heating furnace temperature to maintain design temperature T, foundry goods to be measured is melted;
(1.6) at time t
1time, record the pressure value P of now vacuum chamber
3;
(1.7) open the 5th stop valve, the first stop valve and the 6th stop valve, vacuum chamber is communicated with air, make heating in-furnace temperature maintain design temperature T simultaneously;
(1.8) all stop valves of the front opening of closedown, make vacuum chamber and air disconnect, make heating in-furnace temperature maintain design temperature T simultaneously;
(2), first quantitative gas release after vacuum measurement, comprise following sub-step:
(2.1) open the first stop valve in vacuum pump set, the second stop valve, the 3rd stop valve and the 4th stop valve, utilize vacuum pump set to vacuumize vacuum chamber, make the vacuum tightness in vacuum chamber reach setting value;
(2.2) treat that the vacuum tightness in vacuum chamber reaches setting value P
0after, close the first stop valve in vacuum pump set; Meanwhile, the operation of vacuum pump set is stopped and timing of starting from scratch.
(2.3) at time t
1when/2, open the 8th stop valve, the first quantity tube and air are communicated, then close the 8th stop valve;
(2.4) open the 7th stop valve, the first quantity tube and vacuum chamber are communicated, then close the 7th stop valve;
(2.5) at time t
1time, record the pressure value P of now vacuum chamber
1;
(2.6) open the 5th stop valve, the first stop valve and the 6th stop valve, keep vacuum chamber to communicate with air, make heating in-furnace temperature maintain design temperature T simultaneously;
(2.7) all stop valves of the front opening of closedown, make vacuum chamber and air disconnect, make heating in-furnace temperature maintain design temperature T simultaneously;
(3), second quantitative gas release after vacuum measurement, comprise following sub-step:
(3.1) open the first stop valve in vacuum pump set, the second stop valve, the 3rd stop valve and the 4th stop valve, utilize vacuum pump set to vacuumize vacuum chamber, make the vacuum tightness in vacuum chamber reach setting value;
(3.2) treat that the vacuum tightness in vacuum chamber reaches setting value P
0after, close the first stop valve in vacuum pump set; Meanwhile, the operation of vacuum pump set is stopped and timing of starting from scratch.
(3.3) at time t
1when/2, open the tenth stop valve, the second quantity tube and air are communicated, then close the tenth stop valve;
(3.4) open the 9th stop valve, the second quantity tube and vacuum chamber are communicated, then close the 9th stop valve;
(3.5) at time t
1time, record the pressure value P of now vacuum chamber
2;
(3.6) open the 5th stop valve, the first stop valve and the 6th stop valve, vacuum chamber is communicated with air, and then all stop valves of the front opening of closedown;
(4), the calculating of air content, comprise following sub-step:
(4.1) P measuring and obtain is utilized
1, P
2, P
3, and the volume V of the first quantity tube
1, the second quantity tube volume V
2, obtain the gas volume V in cast-internal
3:
(4.2) by V
3obtain the air content V=V of cast-internal
3/ m.
6. method according to claim 5, is characterized in that: the setting value P of described vacuum tightness
0≤ 0.01Pa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510847071.XA CN105300834B (en) | 2015-11-26 | 2015-11-26 | A kind of apparatus and method for determining inside die-casting part air content |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510847071.XA CN105300834B (en) | 2015-11-26 | 2015-11-26 | A kind of apparatus and method for determining inside die-casting part air content |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105300834A true CN105300834A (en) | 2016-02-03 |
| CN105300834B CN105300834B (en) | 2017-09-01 |
Family
ID=55198347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510847071.XA Active CN105300834B (en) | 2015-11-26 | 2015-11-26 | A kind of apparatus and method for determining inside die-casting part air content |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105300834B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741449A (en) * | 2017-09-14 | 2018-02-27 | 浙江大学 | The test device of Martensite Volume Fraction in austenitic stainless steel |
| CN107741452A (en) * | 2017-09-14 | 2018-02-27 | 浙江大学 | The method of testing of Martensite Volume Fraction in a kind of austenitic stainless steel |
| CN107870116A (en) * | 2016-09-27 | 2018-04-03 | 核工业北京地质研究院 | A kind of mineral stage temperature-raising method Ar Ar determine the gas extraction device in year test |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4395902A (en) * | 1981-10-01 | 1983-08-02 | Mobil Oil Corporation | Method and apparatus for determining phase behavior of oil/gas mixtures at high pressures and temperatures |
| CN86105181A (en) * | 1986-08-13 | 1987-05-06 | 哈尔滨科学技术大学 | The measuring gas contents in die castings of aluminum alloy by vacuum means apparatus and method |
| CN103196786A (en) * | 2013-03-14 | 2013-07-10 | 华中科技大学 | Method and device for quantitatively measuring content of gas inside aluminum alloy die casting |
-
2015
- 2015-11-26 CN CN201510847071.XA patent/CN105300834B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4395902A (en) * | 1981-10-01 | 1983-08-02 | Mobil Oil Corporation | Method and apparatus for determining phase behavior of oil/gas mixtures at high pressures and temperatures |
| CN86105181A (en) * | 1986-08-13 | 1987-05-06 | 哈尔滨科学技术大学 | The measuring gas contents in die castings of aluminum alloy by vacuum means apparatus and method |
| CN103196786A (en) * | 2013-03-14 | 2013-07-10 | 华中科技大学 | Method and device for quantitatively measuring content of gas inside aluminum alloy die casting |
Non-Patent Citations (2)
| Title |
|---|
| LAIHUA WANG ET AL.: ""Gas content in high pressure die castings"", 《JOURNAL OF MATERIALS PROCESSING TECHNOLOGY》 * |
| 铃木宗男 等: ""铝合金压铸件中的气体含量"", 《特种铸造及有色合金》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107870116A (en) * | 2016-09-27 | 2018-04-03 | 核工业北京地质研究院 | A kind of mineral stage temperature-raising method Ar Ar determine the gas extraction device in year test |
| CN107870116B (en) * | 2016-09-27 | 2024-02-09 | 核工业北京地质研究院 | Gas extraction device in Ar-Ar definite-year test by mineral stage heating method |
| CN107741449A (en) * | 2017-09-14 | 2018-02-27 | 浙江大学 | The test device of Martensite Volume Fraction in austenitic stainless steel |
| CN107741452A (en) * | 2017-09-14 | 2018-02-27 | 浙江大学 | The method of testing of Martensite Volume Fraction in a kind of austenitic stainless steel |
| CN107741452B (en) * | 2017-09-14 | 2019-12-13 | 浙江大学 | method for testing volume fraction of martensite in austenitic stainless steel |
| CN107741449B (en) * | 2017-09-14 | 2019-12-13 | 浙江大学 | testing device for martensite volume fraction in austenitic stainless steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105300834B (en) | 2017-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201075051Y (en) | Apparatus for detecting leakage of sealing article | |
| CN105300834A (en) | Device and method for measuring air content in die castings | |
| Wang et al. | Gas content in high pressure die castings | |
| CN103196786B (en) | Method and device for quantitatively measuring content of gas inside aluminum alloy die casting | |
| CN204314032U (en) | High-temperature pipe flange compactedness test macro | |
| JP4994494B2 (en) | Differential pressure measurement method and apparatus | |
| CN105784297A (en) | Hydrogen storage device hydrogen leakage rate testing gas collection device and method thereof | |
| CN111750714B (en) | Device and method for multiple filling and working medium adjusting of high-temperature pulsating heat pipe | |
| CN104090073A (en) | High-temperature leak stopping gel performance tester | |
| CN110836753A (en) | Helium mass spectrum positive pressure detection method for plate-fin heat exchanger with closed chambers on two sides | |
| CN108007822B (en) | High-temperature high-shear dynamic viscosity measuring method and measuring instrument | |
| CN206804640U (en) | A kind of analysis measurement unit for Water Test Kits | |
| RU2543692C1 (en) | Apparatus for inspecting air-tightness of large-size objects | |
| CN110306010A (en) | RH refining furnace all fronts vacuum measurement system | |
| CN107741452B (en) | method for testing volume fraction of martensite in austenitic stainless steel | |
| CN101406935A (en) | Method and apparatus for testing sintering temperature of continuous casting mould fluxes | |
| RU176602U1 (en) | DEVICE FOR DETERMINING HYDROGEN CONTENT IN METALS AND ALLOYS | |
| JP5237644B2 (en) | Hydrogen amount measuring device | |
| CN107389304B (en) | A kind of positive pressure measuring device of aperture water conservancy diversion and its measurement method | |
| CN111537704B (en) | Online measurement device and method for concentration of dissolved oxygen in fuel oil | |
| CN110873674B (en) | Device for measuring saturated vapor pressure of solid matter | |
| CN109708712B (en) | Device and method for measuring mass flow of fixed flow guide element based on dynamic differential pressure attenuation | |
| CN207318169U (en) | A kind of sampler suitable for oxygen nitrogen hydrogen analyzer detection nitrogen content of molten steel | |
| CN208537333U (en) | A kind of compounding system of volatile organic matter gas reference material | |
| CN207703547U (en) | High temperature, negative pressure sampler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |