CN103196786A - Method and device for quantitatively measuring content of gas inside aluminum alloy die casting - Google Patents
Method and device for quantitatively measuring content of gas inside aluminum alloy die casting Download PDFInfo
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- CN103196786A CN103196786A CN2013100809149A CN201310080914A CN103196786A CN 103196786 A CN103196786 A CN 103196786A CN 2013100809149 A CN2013100809149 A CN 2013100809149A CN 201310080914 A CN201310080914 A CN 201310080914A CN 103196786 A CN103196786 A CN 103196786A
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Abstract
The invention discloses a method and device for quantitatively measuring the content of gas inside an aluminum alloy die casting. The method comprises the steps of: washing and measuring certain part or the whole of the die casting, and then placing in a vacuum chamber, vacuumizing to below 0.01Pa by using a vacuum pump, and recording a vacuum pressure value F1; isolating the vacuum chamber from the vacuum pump, heating the die casting to ensure that the die casting is melted and gas in the die casting escapes and the pressure in the vacuum chamber is increased, and recording a vacuum pressure value F2; and finally, converting using F2-F1 according to a corresponding gas standard curve to obtain the content of the gas inside the die casting. The device comprises a heating furnace, a vacuum system, a quantitative gas supplying system and a cooling system. The method allows to quantitatively measure the content of the gas inside the die casting, is high in measuring precision and is capable of accurately evaluating the defect of pores in the die casting. The invention provides a scientific basis for evaluating the defect of the pores in the die casting and optimizing a casting process.
Description
Technical field
The invention belongs to casting technology field, specifically proposed a kind of method and device of quantitative measurement aluminum alloy die casting internal gas content.
Background technology
Aluminum alloy die casting is a kind of part that adopts the pressure casting method to be shaped.Pressure casting is shaped, and to be that aluminium alloy liquid with fusion pours into the pressure of die casting machine indoor, by drift aluminium liquid is pressed at a high speed in the metal die die cavity then, thereby casts out the part with definite shape and size.Because in press casting procedure, molten metal is with high speed and high pressure state filling mold cavity, and a large amount of gases in the mold cavity have little time to discharge and are involved in by the molten metal of turbulent flow and wherein become gas hole defect.Also be dissolved with hydrogen in the aluminium liquid in addition, hydrogen reduces because of the temperature of aluminium liquid, and the solubleness in aluminium liquid descends and separates out, and remains in foundry goods inside if the hydrogen of separating out has little time to discharge and also can form pore.Therefore pore is the modal defective of die casting, and the existence of pore has not only reduced 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, and the intensity of metal is descended and the anti-fatigue ability reduction.
The common method that detects die casting internal porosity defective has ultrasound wave, X-ray nondestructive examination, densimetry etc., like this can by the judgement of gas hole defect assess indirectly foundry goods inside air content how much, but can't accurately determine foundry goods gas inside content.Patent documentation " measuring gas contents in die castings of aluminum alloy by vacuum means apparatus and method " (CN86105181A, open day is on 05 06th, 1987) has proposed a kind of device that calculates gas content in the foundry goods according to equation for ideal gases.But owing to measure the temperature in zone and the parameter influences such as fluctuation of gas density, the quantitative detection error of this method is bigger.Therefore need a kind of method that quantitatively detects die casting internal gas content more accurately of research.
In sum, at present have very big deficiency aspect the method for the inner air content of quantitative measurement die casting and the device development, applied method nearly all is qualitative evaluation.Therefore the technology that exploitation can the inner air content of quantitative measurement die casting is significant for estimating the foundry goods internal soundness.
Summary of the invention
The object of the present invention is to provide method and the device of the inner air content of a kind of quantitative measurement aluminum alloy die casting, to overcome the bigger defective of detection error that exists in the prior art.
The method of a kind of quantitative measurement aluminum alloy die casting internal gas content provided by the invention comprises the steps:
The 1st step was placed in the vacuum chamber after a certain a part or whole part of die casting is cleaned metering, was evacuated to 0.01Pa record vacuum pressure value F1 at this moment with vacuum pump;
The 2nd step was isolated vacuum chamber and vacuum pump, foundry goods was heated to make its fusing again, and the gas in the foundry goods is overflowed, and pressure increases in the vacuum chamber, record vacuum pressure value F2 at this moment;
The above-mentioned vacuum pressure difference (F2-F1) that the 3rd step will obtain, corresponding gas standard curve, converting obtains die casting gas inside content.
The device of a kind of quantitative measurement aluminum alloy die casting internal gas content provided by the invention is characterized in that, this device comprises heating furnace, vacuum system, quantitative air supply system and cooling system;
Described vacuum system comprises vacuum chamber, loam cake, resistance vacuum gauge, thermometer and vacuum unit; Loam cake is installed on the vacuum chamber top, seals by O-ring seal between loam cake and the vacuum chamber, thereby forms confined space; The vacuum unit is connected with vacuum chamber; Resistance vacuum gauge, thermometer are installed in and cover, and are respectively applied to measure vacuum tightness and temperature in the vacuum chamber;
The inlet end of described quantitative air supply system is used for linking to each other with external source of the gas, and the outlet side links to each other with vacuum chamber;
The cooling duct of described cooling system is arranged in loam cake, is used for cooling off the O-ring seal that places between vacuum chamber and the loam cake.
By the above technical scheme that the present invention conceives, compared with prior art, the present invention allows quantitative measurment die casting gas inside content, and has higher measuring accuracy, can estimate the gas hole defect in the foundry goods accurately.This will help improvement and the optimization of condition of work and technology in the casting forming process, reducing being involved in of gas as far as possible, thereby reduces foundry goods gas inside content.The present invention provides scientific basis for evaluation die casting gas hole defect, optimization casting technique.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of apparatus of the present invention, wherein: 1, heating furnace, 2, resistance wire, 3, vacuum chamber, 4, loam cake, 5, second stop valve, 6, vacuum unit, 7, mechanical pump, the 8, the 3rd stop valve, 9, lobe pump, 10, the 4th stop valve, 11, ODP, 12, first stop valve, 13, quantitative air supply system, 14, the 5th stop valve, 15, quantity tube, the 16, the 6th stop valve, 17, resistance vacuum gauge, 18, thermometer, 19, cooling system, 20, crucible, 21, part to be measured.
Fig. 2 is the typical curve method for drafting between vacuum pressure difference and the gas volume.
Fig. 3 carries out gas content test process synoptic diagram for the inventive method.
Embodiment
Because mold cavity gas inside source mainly contains two classes, the one, air; The 2nd, the gas that the lubricated wet goods of coating, drift volatilizees when running into high temperature aluminum liquid, decomposes and produces, so the main nitrogen of foundry goods gas inside composition, oxygen, CO
2And methane etc.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further.Need to prove at this, understand the present invention for the explanation of these embodiments for helping, but do not constitute limitation of the invention.In addition, below in each embodiment of described the present invention involved technical characterictic just can not make up mutually as long as constitute conflict each other.
The method that example of the present invention provides comprises the steps:
The 1st step was placed in the vacuum chamber after a certain a part or whole part of die casting is cleaned metering, was evacuated to 0.01Pa record vacuum pressure value F1 at this moment with vacuum pump;
The 2nd step was isolated vacuum chamber and vacuum pump, foundry goods was heated to make its fusing again, and the gas in the foundry goods is overflowed, and pressure increases in the vacuum chamber, record vacuum pressure value F2 at this moment;
The above-mentioned vacuum pressure difference (F2-F1) that the 3rd step will obtain, corresponding gas standard curve, converting draws die casting gas inside content.
Described gas standard curve obtains according to following method:
The 1st step, the mixed gas that composition is consistent with foundry goods gas inside composition was injected in the enclosed vacuum chamber, vacuum chamber pressure after vacuum chamber pressure when initial before the record injecting gas and the injecting gas during temperature stabilization, and calculate the vacuum pressure difference; Vacuum chamber pressure when initial is below 0.01Pa;
The described mixed gas of the 2nd pacing examination different volumes more than at least 3 kinds obtains the vacuum pressure difference under the different volumes;
The 3rd step is corresponding with the gas volume of the vacuum pressure difference of vacuum chamber and injection, draws the typical curve of vacuum pressure difference and gas volume, and namely the x axle is the vacuum pressure difference of injecting gas front and back, and the y axle is gas volume.
The volume of gas described in the present invention or mixed gas all refers to the volume under the atmospheric pressure.
As shown in Figure 1, the device that provides of example of the present invention is mainly by heating furnace, vacuum system, quantitatively air supply system and cooling system are formed.
Heating furnace 1 mainly provides the required heat of melting aluminum alloy pressuring casting as a thermal source.Thereby heating furnace 1 produces heat by resistance wire 2 heatings and makes part 21 fusings to be measured.
Vacuum system mainly is made up of vacuum chamber 3, loam cake 4, resistance vacuum gauge 17, thermometer 18 and vacuum unit 6.Loam cake 4 is installed on vacuum chamber 3 tops, seals by O-ring seal between loam cake 4 and the vacuum chamber 3, thereby forms confined space.For the pressure in the vacuum chamber 3 is reached below the 0.01Pa, vacuum unit 6 comprises the vacuum pump combination that is made of ODP 11, lobe pump 9 and mechanical pump 7, and first to fourth stop valve 12,5,8 and 10; Wherein, mechanical pump 7, the 3rd stop valve 8 connect and compose roughing line by pipeline and vacuum chamber 3, simultaneously lobe pump 9 and mechanical pump 7, the 4th stop valve 10 connect and compose the forvacuum pipeline of ODP 11 by pipeline and vacuum chamber 3, and first stop valve 12, ODP 11, second stop valve 5, lobe pump 9, mechanical pump 7 are connected in series formation with vacuum chamber 2 successively by pipeline and vacuumize closed pipeline.Be equipped with for the vacuum tightness in the measurement vacuum chamber 3 and resistance vacuum gauge 17 and the thermometer 18 of temperature at loam cake 4.
During detection, the crucible 20 that is placed with part 21 to be measured places vacuum chamber 3, and vacuum chamber 3 is placed in the heating furnace 1, seals by multi-sealed circle with loam cake 4, and is air tight to guarantee.Have passage in loam cake 4, resistance vacuum gauge 17 and thermometer 18 enter in the vacuum chamber 3 by passage and measure.At least below 0.01Pa, ODP 11 is main pump to working pressure in the vacuum chamber in the vacuum unit 6, the use of connecting with lobe pump 9, mechanical pump 7.Whole vacuum unit 6 links to each other with vacuum chamber loam cake 4 by vacuum pipe, is controlled the break-make of each vacuum pipe by first stop valve to the, four stop valves.When utilizing 6 pairs of vacuum chambers 3 of vacuum unit to vacuumize, should open the 3rd stop valve 8 earlier, starting 7 pairs of vacuum chambers 3 of mechanical pump slightly takes out, after treating that force value that resistance vacuum gauge 17 shows is stable, close the 3rd stop valve 8 earlier and open the 4th stop valve 10 then, start lobe pump 9, treat to close earlier when force value is stablized again the 4th stop valve 10 and open second stop valve 5, first stop valve 12 and ODP 11 more successively, after vacuumizing end, close first stop valve 12, ODP 11, second stop valve 5, lobe pump 9 and mechanical pump 7 in order.
Quantitatively air supply system 13 comprises the 5th stop valve 14, quantity tube 15 and the 6th stop valve 16 that connects by pipeline successively, and quantitatively the inlet end of air supply system 13 is used for linking to each other with external source of the gas, and the outlet side links to each other with vacuum chamber 3.Quantity tube 15 has multiple different volume, can change different volumes as required, realizes vacuum system is injected the function of different volumes gas, to draw the gas standard curve.
Cooling system 19 is water-circulating cooling device, and the cooling duct is arranged in loam cake 4, is used for cooling and places O-ring seal between vacuum chamber 3 and the loam cake 4, to guarantee that O-ring seal at high temperature still has good sealing effectiveness.
As Fig. 2, shown in Figure 3, the concrete course of work of said apparatus is:
1, the drafting of typical curve
(1) closes i.e. first stop valve to the, four stop valves of stop valve in the vacuum unit 6, open the 6th stop valve 16, guarantee that the 5th stop valve 14 closes, in quantity tube 15, feed gas.
(2) close the 6th stop valve 16, utilize 6 pairs of vacuum chambers 3 of vacuum unit to vacuumize, the pressure in the vacuum chamber 3 is remained on below the 0.01Pa, the force value in the record vacuum chamber 3 this moment.
(3) close stop valves all in the vacuum unit 6, disconnection vacuum unit 6 is connected with vacuum chamber 3, namely vacuumizes end.
(4) keep vacuum chamber 3 airtight, heating furnace 3 is started working, and temperature is set to 700 ℃, and this temperature is maintained to this process and finishes.
(5) open the 5th stop valve 14, the gas that discharges in the quantity tube 15 enters into vacuum chamber, treats to record the force value of vacuum chamber 3 at this moment behind the temperature stabilization, does difference with the force value that obtains in the step (2) and obtains the pressure added value.
(6) change quantity tube 15, (1)-(5) of repeating above step.
(7) with the data point that records, be the x axle with the pressure added value, gas volume is drawn the gas standard curve for the y axle, and the match typical curve, draws expression formula.
2, the mensuration of the inner air content of die casting
(1) part 21 to be measured was put into sodium hydroxide solution about 2 minutes, after washing, immersed in the nitric acid about 30 seconds, water, alcohol and acetone are cleaned again successively, it are blown a cold wind over, quantitative immediately at once, and put in the crucible 20 that places vacuum chamber 3, cover tightly vacuum chamber loam cake 4.
(2) utilize 6 pairs of vacuum chambers 3 of vacuum unit to vacuumize, the pressure in the vacuum chamber 3 is remained on below the 0.01Pa, the force value in the record vacuum chamber 3 this moment.
(3) close stop valves all in the vacuum unit 6, disconnect vacuum unit 6 and directly be connected with vacuum chamber 3.
(4) keep vacuum chamber 3 airtight, heating furnace 3 is started working, and temperature is set to 700 ℃, and this temperature is maintained to this process and finishes, and makes part 21 fusings to be measured.
(5) treat to record the force value of vacuum chamber 3 at this moment behind the temperature stabilization, do difference with the force value that obtains in the step (2) and obtain the pressure added value.
(6) by typical curve the pressure added value is converted into gas content.
Embodiment 1
On the horizontal cold-chamber die casting machine of 2800KN the AlSi10Mg alloy is carried out common die casting and evacuated die-casting process, utilize this device that the part that obtains is carried out the air content test, the contrast test result is as shown in table 1.
Embodiment 2
The die casting each several part is cut, respectively part part, clout piece and overflow groove are carried out the air content test, test result is as shown in table 2.
Those skilled in the art will readily understand; the above is only for explaining the embodiment that selects of the present invention; not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
The air content (ml/100g) of the table common die casting of 1AlSi10Mg alloy and evacuated die-casting process part
The air content (ml/100g) of table 2 die casting each several part
Claims (5)
1. the method for a quantitative measurement aluminum alloy die casting internal gas content comprises the steps:
The 1st step was placed in the vacuum chamber after a certain a part or whole part of die casting is cleaned metering, was evacuated to 0.01Pa record vacuum pressure value F1 at this moment with vacuum pump;
The 2nd step was isolated vacuum chamber and vacuum pump, foundry goods was heated to make its fusing again, and the gas in the foundry goods is overflowed, and pressure increases in the vacuum chamber, record vacuum pressure value F2 at this moment;
The above-mentioned vacuum pressure difference (F2-F1) that the 3rd step will obtain, corresponding gas standard curve, converting obtains die casting gas inside content.
2. the method for quantitative measurement aluminum alloy die casting internal gas content according to claim 1 is characterized in that, described gas standard curve obtains according to following process:
1. composition is consistent with foundry goods gas inside composition mixed gas is injected in the enclosed vacuum chamber, the vacuum chamber pressure after the vacuum chamber pressure when initial before the record injecting gas and the injecting gas during temperature stabilization, and calculate the vacuum pressure difference; Vacuum chamber pressure when initial is below 0.01Pa;
2. the described mixed gas of test different volumes more than at least 3 kinds obtains the vacuum pressure difference under the different volumes;
3. the gas volume of the vacuum pressure difference of vacuum chamber and injection is corresponding, draw the typical curve of vacuum pressure difference and gas volume, namely the x axle is the vacuum pressure difference of injecting gas front and back, the y axle is gas volume.
3. the device of a quantitative measurement aluminum alloy die casting internal gas content is characterized in that, this device comprises heating furnace, vacuum system, quantitative air supply system and cooling system;
Described vacuum system comprises vacuum chamber (3), loam cake (4), resistance vacuum gauge (17), thermometer (18) and vacuum unit (6); Loam cake (4) is installed on vacuum chamber (3) top, seals by O-ring seal between loam cake (4) and the vacuum chamber (3), thereby forms confined space; Vacuum unit (6) is connected with vacuum chamber (3); Resistance vacuum gauge (17), thermometer (18) are installed on the loam cake (4), are respectively applied to measure vacuum tightness and temperature in the vacuum chamber (3);
The inlet end of described quantitative air supply system is used for linking to each other with external source of the gas, and the outlet side links to each other with vacuum chamber (3);
The cooling duct of described cooling system is arranged in loam cake (4), is used for cooling off the O-ring seal that places between vacuum chamber (3) and the loam cake (4).
4. the device of quantitative measurement aluminum alloy die casting internal gas content according to claim 3, it is characterized in that vacuum unit (6) comprises ODP (11), lobe pump (9), mechanical pump (7), first stop valve (12), second stop valve (5), the 3rd stop valve (8) and the 4th stop valve (10); Wherein, mechanical pump (7), the 3rd stop valve (8) connect and compose roughing line by pipeline and vacuum chamber (3), simultaneously lobe pump (9) and mechanical pump (7), the 4th stop valve (10) connect and compose the forvacuum pipeline of ODP (11) by pipeline and vacuum chamber (3), and first stop valve (12), ODP (11), second stop valve (5), lobe pump (9), mechanical pump (7) are connected in series formation with vacuum chamber (3) successively by pipeline and vacuumize closed pipeline.
5. according to the device of claim 3 or 4 described quantitative measurement aluminum alloy die casting internal gas content, it is characterized in that, described quantitative air supply system comprises the 5th stop valve (14), quantity tube (15) and the 6th stop valve (16) that connects by pipeline successively, and quantity tube (15) has multiple different volume.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103817308A (en) * | 2014-02-21 | 2014-05-28 | 广东鸿图科技股份有限公司 | Punch for high-vacuum die casting and lubrication device for punch |
| CN105300834A (en) * | 2015-11-26 | 2016-02-03 | 广东鸿图科技股份有限公司 | Device and method for measuring air content in die castings |
| CN106442214A (en) * | 2016-08-31 | 2017-02-22 | 兰州空间技术物理研究所 | Material outgassing rate measuring device and method based on hot cathode gauges through static pressure rise method |
| CN108918340A (en) * | 2018-06-22 | 2018-11-30 | 航天材料及工艺研究所 | The phenolic resin of resistance to ablation pyrolytic process discharge quantity test device and test method |
| CN109655491A (en) * | 2019-01-15 | 2019-04-19 | 安徽奥特佳科技发展有限公司 | A kind of aluminum alloy die casting stomata and shrinkage cavity defect overall quality detection method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3517543A (en) * | 1966-10-14 | 1970-06-30 | Feinmechanik Anstalt | Apparatus for the determination of hydrogen in aluminum melts |
| EP0212371A2 (en) * | 1985-08-07 | 1987-03-04 | Aluminum Company Of America | Method and apparatus for determining soluble gas content |
| CN101657282A (en) * | 2007-04-16 | 2010-02-24 | 新东工业株式会社 | Low-pressure casting apparatus, method of inert gas filling and process for manufacturing cast article |
| CN101813595A (en) * | 2009-07-13 | 2010-08-25 | 哈尔滨理工大学 | Device of quickly measuring hydrogen content in aluminium alloy fusant |
-
2013
- 2013-03-14 CN CN201310080914.9A patent/CN103196786B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3517543A (en) * | 1966-10-14 | 1970-06-30 | Feinmechanik Anstalt | Apparatus for the determination of hydrogen in aluminum melts |
| EP0212371A2 (en) * | 1985-08-07 | 1987-03-04 | Aluminum Company Of America | Method and apparatus for determining soluble gas content |
| CN101657282A (en) * | 2007-04-16 | 2010-02-24 | 新东工业株式会社 | Low-pressure casting apparatus, method of inert gas filling and process for manufacturing cast article |
| CN101813595A (en) * | 2009-07-13 | 2010-08-25 | 哈尔滨理工大学 | Device of quickly measuring hydrogen content in aluminium alloy fusant |
Non-Patent Citations (1)
| Title |
|---|
| 铃木宗男、宫地英敏: "铝合金压铸件中的气体含量", 《特种铸造及有色合金》, 31 December 1984 (1984-12-31) * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103817308A (en) * | 2014-02-21 | 2014-05-28 | 广东鸿图科技股份有限公司 | Punch for high-vacuum die casting and lubrication device for punch |
| CN103817308B (en) * | 2014-02-21 | 2016-01-20 | 广东鸿图科技股份有限公司 | A kind of high vacuum die casting drift and the lubricating arrangement for this drift |
| CN105300834A (en) * | 2015-11-26 | 2016-02-03 | 广东鸿图科技股份有限公司 | Device and method for measuring air content in die castings |
| CN105300834B (en) * | 2015-11-26 | 2017-09-01 | 广东鸿图科技股份有限公司 | A kind of apparatus and method for determining inside die-casting part air content |
| CN106442214A (en) * | 2016-08-31 | 2017-02-22 | 兰州空间技术物理研究所 | Material outgassing rate measuring device and method based on hot cathode gauges through static pressure rise method |
| CN106442214B (en) * | 2016-08-31 | 2019-06-18 | 兰州空间技术物理研究所 | Static pressurizing method material outgassing rate measuring device and method based on hot cathode rule |
| CN108918340A (en) * | 2018-06-22 | 2018-11-30 | 航天材料及工艺研究所 | The phenolic resin of resistance to ablation pyrolytic process discharge quantity test device and test method |
| CN108918340B (en) * | 2018-06-22 | 2020-11-20 | 航天材料及工艺研究所 | Device and method for testing air release amount of ablation-resistant phenolic resin in pyrolysis process |
| CN109655491A (en) * | 2019-01-15 | 2019-04-19 | 安徽奥特佳科技发展有限公司 | A kind of aluminum alloy die casting stomata and shrinkage cavity defect overall quality detection method |
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