CN103542953B - The measuring method in sand mold temperature field in dull and stereotyped magnesium alloy sand mold casting - Google Patents
The measuring method in sand mold temperature field in dull and stereotyped magnesium alloy sand mold casting Download PDFInfo
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Abstract
The present invention relates to the measuring method in sand mold temperature field in the dull and stereotyped magnesium alloy sand mold casting of a kind of magnesium alloy sand mold casting and casting mold heat exchange research field, comprise the steps: step 1, get sandbox and casting die, adopt sand lump formative method stationary heat galvanic couple, carry out the moulding of sand mold afterwards, and then thermopair is fixed in sand mold; Step 2, in die cavity, a thermopair is fixed in sand mold vicinity, thermopair in die cavity and sand mold is connected to each channel interface of temperature collecting device, frequency acquisition is carried out to acquisition software and grab type carries out optimum configurations, pour into the measurement that molten metal carries out sand mold temperature field, make temperature measurement result accurate.Multi-channel temperature acquisition device is adopted to not only increase collecting efficiency, and can the temperature variations of the real-time foundry goods of direct vision and sand mold, timely control temperature measures finish time, and the mold temperature field testing efficiency of magnesium alloy plate foundry goods is greatly improved.
Description
Technical field
The present invention relates to magnesium alloy sand mold casting and casting mold heat exchange research field, especially in mensuration field, magnesium alloy sand mold casting sand type temperature field, be specifically related to the measuring method in sand mold temperature field in a kind of dull and stereotyped magnesium alloy sand mold casting.
Background technology
Along with the development of computer simulation emulation technology and the appearance of relative commercial software (Magma, Anycasitng, Procast etc.), accurate simulation sand casting and process of setting become possibility.And the accuracy of analog result depends on the accuracy chosen and arrange of boundary condition, starting condition to a great extent.As one of boundary condition, interface heat exchange coefficient can weigh the heat transfer resistance between casting and mold in casting solidification process, and the process of setting therefore for foundry goods plays vital effect.In actual casting solidification process, interface heat exchange coefficient changes with the difference of temperature and process conditions etc. and makes its Exact Solution seem more difficult, and in realistic simulation process, most analog result is all set to a steady state value, and this just causes the relatively large deviation of analog result and actual result.For determining that casting and mold interface heat exchange coefficient in time or the variation relation of temperature, domestic and international correlative study person has done a large amount of work, but mainly concentrate in die casting and permanent mold casting, and the still rare report of work of field this respect is cast at sand, this restrict the accuracy of sand casting process computer simulation.
Calculating for interface heat exchange coefficient needs the temperature field knowing foundry goods and sand mold, especially near the thermo parameters method of both combination interfaces.Because metal guide is better hot, the thermograde in molten metal is less, and the temperature field in Measurement accuracy foundry goods is relatively easy.But due to molding sand thermal conductivity relatively low, the sand mold area temperature gradient especially near cast(ing) surface is large, and therefore, thermopair distance subtle change also can cause temperature field measurement result inaccurate.Meanwhile, in the process calculating interface heat exchange coefficient, proved by amount of literature data and experimental calculation case, from the temperature measurement result in the sand mold close to foundry goods, more can make a big impact to the calculating of result of calculation.Therefore, find magnesium alloy sand mold casting solidification temperature field accurately assay method tool be of great significance.
But due in the mensuration process of Mg alloy castings process of setting sand mold temperature field, especially in manual sand casting modeling process, moulding is easy to mobile thermopair, inevitably make thermocouple measuring temperature result inaccurate, be difficult to ensure by the accuracy of the temperature computation interface heat exchange coefficient of thermocouple measurement.At present, about in the method for measurement Mg alloy castings process of setting sand mold temperature field, measurement result is accurate, and the assay method that can be used to Measurement accuracy sand mold temperature field there is not yet report.
To sum up, the present invention is directed to dull and stereotyped Mg alloy castings sand casting sand mold temperature field measurement, propose a kind of plate casting sand casting temperature field measurement method.The present invention and tradition are directly used compared with thermocouple measuring temperature technology, measure order of accuarcy and greatly improve; Meanwhile, measurement result can be used for the coefficient of heat transfer calculating foundry goods and mold―metal interface, can meet request for utilization.
Summary of the invention
The invention discloses a kind of dull and stereotyped magnesium alloy sand mold casting sand type temperature field measurement method.Can ensure, meeting while casting technique wants read group total interface heat exchange coefficient to heat transfer type requirement, accurately measure and obtain sand mold temperature field.
The present invention is realized by following technical scheme, the present invention relates to the measuring method in sand mold temperature field in a kind of dull and stereotyped magnesium alloy sand mold casting, comprises the steps:
Step 1, gets sandbox and casting die, adopts sand lump formative method stationary heat galvanic couple, carries out the moulding of sand mold afterwards, and then be fixed in sand mold by thermopair;
Step 2, in die cavity, a thermopair is fixed in sand mold vicinity, thermopair in die cavity and sand mold is connected to each channel interface of temperature collecting device, frequency acquisition is carried out to acquisition software and grab type carries out optimum configurations, pour into the measurement that molten metal carries out sand mold temperature field, make temperature measurement result accurate.
Described casting die and cast shape and in the same size.
The shape of described sand lump conforms to the profile of foundry goods, and the material of sand lump is identical with the material of casting mold.
Described sand lump formative method is specially: the mould of described sand lump moulding is the little rectangular parallelepiped metal die of top end opening, in its bottom surface correct position punching to insert thermopair, the quantity in hole is 2 ~ 8, the diameter in hole is 1 ~ 2mm, and thermopair, at 2 ~ 8mm, is put in specific hole, mould bottom surface and is fixed by the spacing in hole, after thermopair in mould is fixing, add silica sand, after 10 ~ 30min, the solidification of sand lump Sand, completes sand lump moulding.
The formative method of described sand mold is specially: the little groove arranging suitable quantity on sand lump, is placed on the centre position of foundry goods side by sand lump, in sandbox, add silica sand, after solidification, completes the moulding of sand mold.
Before pouring into molten metal, start to start the result that acquisition software is shown by each thermocouple measurement, check whether all thermopairs normally work, start after inspection to pour into molten metal and start measuring tempeature change.
Compared with prior art, the present invention has following beneficial effect:
(1) multi-channel temperature acquisition device is adopted to not only increase collecting efficiency, and can the temperature variations of the real-time foundry goods of direct vision and sand mold, timely control temperature measures finish time, and the mold temperature field testing efficiency of magnesium alloy plate foundry goods is greatly improved;
(2) adopt the technology of sand lump moulding stationary heat galvanic couple, have following advantage: mould base has openning hole, for stationary heat galvanic couple, ensure the accuracy of temperature measurement result to greatest extent, prevent thermopair from moving, indeterminable generation; First hole in the Distance geometry sand mold of mould one lateral edges first thermopair from foundry goods apart from identical, the location gap in hole is identical with the spacing of thermopair, make like this thermopair from the position at foundry goods interface be exactly hole from the marginate position of metal pattern, thermocouple location accuracy is improved greatly; Thermopair inserts occiput exposed portion distance, and such sand lump solidification can directly by the distance of ruler measurement thermopair from sand lump edge i.e. foundry goods, if there is deviation to adjust in time; The sand lump made in advance, its shape is identical with foundry goods profile, and material is identical with sand mould material, and arranges groove and ensure that sand lump and mold material are combined closely, and is conducive to the accurate measurement realizing temperature field;
(3) compared with other temperature surveys, accuracy is higher, and technique more simply more easily operates and implements, and cost is lower.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is casting mold system sectional view in embodiment;
Fig. 2 is the vertical view of sand lump in embodiment;
Fig. 3 is temperature change curve in time in the foundry goods and sand mold gathered in embodiment.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
Method of the present invention implement time, the technological parameter be specifically related to and step as follows:
(1) foundry goods that the present invention studies is dull and stereotyped Mg alloy castings, and Modeling Material is silica sand, and cementing agent is resin, and binder content is 1% ~ 5%(massfraction of roughing sand);
(2) mould that sand lump moulding is used is metal die, and the shape of mould is the small cubes of upper end open; Base has openning hole mould in advance, and the quantity in hole is 2 ~ 8, and the diameter in hole is 1 ~ 2mm, and the spacing in hole is at 2 ~ 8mm.The range of size of the sand lump made of metal die is: the length of sand lump is at 40 ~ 80mm, and width 30 ~ 50mm, thickness is at 10 ~ 40mm.Be fixed on by thermopair in the hole of the bottom surface of metal die, the placement direction of thermopair is in alignment and parallel with foundry goods, and thermopair spacing is 2 ~ 8mm, and the length that thermopair head exposes simultaneously is 1 ~ 4mm; After thermopair being fixed on metal die base, in mould, add silica sand, after 10 ~ 30min solidification, sand lump moulding completes;
(3), after sand lump moulding completes, the spacing of part of appearing with thermopair in ruler measurement sand lump, by being placed on from the side close to thermopair near foundry goods side, adds silica sand in sandbox, and 1 ~ 2h solidifies, and completes sand mold modeling process;
(4) in die cavity, near sand mold 1 ~ 2mm, a thermopair is fixed, thermopair in thermopair in sand lump and die cavity is connected to the respective channel interface of multi-channel temperature acquisition device, frequency acquisition is set to 1 ~ 5HZ, grab type is continuous acquisition, before actual casting of molten metal, start the result that acquisition software is shown by each thermocouple measurement, check whether all thermopairs normally work, start after inspection to pour into molten metal and start measuring tempeature change, temperature variation is recorded from magnesium alloy molten metal is poured into a mould at first, terminating to gather the moment is that the molten metal temperature of actual measurement is near magnesium alloy eutectic temperature.
embodiment
Be of a size of the dull and stereotyped Mg alloy AZ91 of 10mm × 200mm × 200mm for casting die, measure the change of temperature field of sand mold.Modeling Material is silica sand, and cementing agent is self-hardening furan resin, and binder content is 1% (massfraction) of roughing sand, and the mould of sand lump moulding is aluminum alloy mould, and the size of sand lump is 40mm × 30mm × 20mm, and in sand lump, the quantity of thermopair is 4.
Step 1, before moulding, material prepares;
Prepare and foundry goods same shape and the mould of size and the sandbox of suitable size, puddle mixer is utilized to be prepared by Modeling Material, need before moulding whether can normally use each thermopair to test, Modeling Material is silica sand, cementing agent is resin, and binder content is 1 ~ 5%(massfraction of roughing sand).Fig. 1 is casting mold system sectional view; In Fig. 1,1 is sandbox; 2 is die cavity; 3 is sand lump; 4 is thermopair.
Step 2, sand lump moulding;
The mould of sand lump moulding is the rectangular parallelepiped metal die of upper end open, and the base of metal die has openning hole in advance, and the quantity in hole is 4, and the diameter in hole is 1mm, and the spacing in hole is 5mm, and the sand lump size made in advance is 40mm × 30mm × 20mm.4 thermopairs are fixed in 4 holes on metal die bottom surface, the placement direction of thermopair is parallel with foundry goods, and thermopair spacing is 5mm, four thermopairs are respectively 1mm, 6mm, 11mm from the distance at foundry goods interface, 16mm, the length that thermopair insertion occiput exposes is 2mm.Be fixed on by thermopair in the hole of metal die bottom surface, add silica sand, silica sand solidification after 20min, sand lump moulding completes.Fig. 2 is sand lump vertical view; In Fig. 2,4 is thermopair; 3 is sand lump; 5 is the one side near foundry goods in sand lump.L is the length of sand lump, and 40mm≤L≤80mm, d is the width of sand lump, and 30mm≤d≤50mm, l is the spacing of thermopair, is worth for 2mm≤l≤8mm.
Step 3, sand mold moulding;
Sandbox size is 200mm × 200mm × 200mm, and casting die size is 10mm × 200mm × 200mm.Sand lump arranges some grooves, places it near foundry goods side, and be placed on centre position, then in sandbox, add silica sand, 1h molding sand solidifies, and completes the modeling process of sand mold;
Step 4, cast and temperature field measurement;
A thermopair is fixed from sand mold 1mm place in die cavity, after utilizing temperature acquisition software and thermocouple assay to guarantee that thermopair and acquisition software optimum configurations are normally before cast, start to pour into magnesium alloy molten metal, start to record the temperature variation in foundry goods and sand mold simultaneously, temperature measuring equipment is connected to by thermopair in the temperature collecting device of 18 passages, frequency acquisition is 1HZ, and thermopair diameter is 1mm.Temperature collecting device records temperature variation from AZ91 molten metal is poured into a mould at first, and end is the molten metal temperature of actual measurement is 420 DEG C of moment, and this temperature is near AZ91 magnesium alloy eutectic temperature.Measurement result is as Fig. 3.Fig. 3 be experiment gather foundry goods and sand mold in temperature change curve in time.In Fig. 3, TC1 is the time dependent curve of temperature from the thermocouple measurement of foundry goods/1mm position, sand mold interface in foundry goods; TC2, TC3, TC4 and TC5 are from foundry goods/sand mold interface 1mm in sand mold respectively, the time dependent curve of thermocouple measuring temperature of 6mm, 11mm, 16mm position.Multi-channel temperature acquisition device is adopted to improve collecting efficiency in the present embodiment, can the temperature variations of the real-time foundry goods of direct vision and sand mold, can measure finish time by control temperature in time, the mold temperature field testing efficiency of magnesium alloy plate foundry goods is greatly improved; Adopt the technology of sand lump moulding stationary heat galvanic couple in the present embodiment, mould base has openning hole, and for stationary heat galvanic couple, ensures the accuracy of temperature measurement result to greatest extent, prevents thermopair from moving, indeterminable generation; First hole in the Distance geometry sand mold of mould one lateral edges first thermopair from foundry goods apart from identical, the location gap in hole is identical with the spacing of thermopair, make like this thermopair from the position at foundry goods interface be exactly hole from the marginate position of metal pattern, thermocouple location accuracy is improved greatly; Thermopair inserts occiput exposed portion distance, and such sand lump solidification can directly by the distance of ruler measurement thermopair from sand lump edge i.e. foundry goods, if there is deviation to adjust in time; The sand lump made in advance, its shape is identical with foundry goods profile, and material is identical with sand mould material, and arranges groove and ensure that sand lump and mold material are combined closely, and is conducive to the accurate measurement realizing temperature field; Compared with other temperature surveys, accuracy is higher, and technique more simply more easily operates and implements, and cost is lower.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (5)
1. the measuring method in sand mold temperature field in the casting of dull and stereotyped magnesium alloy sand mold, is characterized in that, comprise the steps:
Step 1, gets sandbox and casting die, adopts sand lump formative method stationary heat galvanic couple, carries out the moulding of sand mold afterwards, and then be fixed in sand mold by thermopair; Described foundry goods is dull and stereotyped Mg alloy castings;
Step 2, in die cavity, a thermopair is fixed in sand mold vicinity, thermopair in die cavity and sand mold is connected to each channel interface of temperature collecting device, acquisition software is carried out to the optimum configurations of frequency acquisition and grab type, pour into the measurement that molten metal carries out sand mold temperature field, make temperature measurement result accurate;
Described sand lump formative method is specially: the mould of described sand lump moulding is the little rectangular parallelepiped metal die of top end opening, in its bottom surface correct position punching to insert thermopair, the quantity in hole is 2 ~ 8, the diameter in hole is 1 ~ 2mm, and thermopair, at 2 ~ 8mm, is put in the hole of mould bottom surface and is fixed by the spacing in hole, after thermopair in mould is fixing, add silica sand, after 10 ~ 30min, the solidification of sand lump Sand, completes sand lump moulding.
2. the measuring method in sand mold temperature field in dull and stereotyped magnesium alloy sand mold casting as claimed in claim 1, is characterized in that, described casting die and cast shape and in the same size.
3. the measuring method in sand mold temperature field in dull and stereotyped magnesium alloy sand mold casting as claimed in claim 1, it is characterized in that, the shape of described sand lump conforms to the profile of foundry goods, and the material of sand lump is identical with the material of sand mold.
4. the measuring method in sand mold temperature field in dull and stereotyped magnesium alloy sand mold casting as claimed in claim 1, it is characterized in that, the formative method of described sand mold is specially: the little groove arranging suitable quantity on sand lump, sand lump is placed on the centre position of foundry goods side, silica sand is added in sandbox, after solidification, complete the moulding of sand mold.
5. the measuring method in sand mold temperature field in dull and stereotyped magnesium alloy sand mold casting as claimed in claim 1, it is characterized in that, before pouring into molten metal, start to start the result that acquisition software is shown by each thermocouple measurement, check whether all thermopairs normally work, start after inspection to pour into molten metal and start measuring tempeature change.
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| CN110044507B (en) * | 2019-04-16 | 2021-03-23 | 清华大学 | Sand casting accurate temperature measurement method based on temperature measurement unit positioning |
| CN110125342B (en) * | 2019-06-11 | 2020-09-29 | 清华大学 | Positioning and fixing method for temperature thermocouple inside sand casting mold |
| CN111044554A (en) * | 2019-12-27 | 2020-04-21 | 郑州机械研究所有限公司 | Method for testing molten iron cooling curve |
| CN112642997A (en) * | 2020-12-16 | 2021-04-13 | 南通海泰科特精密材料有限公司 | Method for confirming boundary heat exchange system in casting |
| CN113842964B (en) * | 2021-09-18 | 2023-10-20 | 蚌埠学院 | Binary alloy eutectic melting crucible |
| CN114888247B (en) * | 2022-04-20 | 2023-01-06 | 河南农业大学 | Method for testing corresponding relation between temperature at temperature measuring hole in sand casting and actual temperature |
| CN116894372B (en) * | 2023-09-11 | 2023-12-15 | 潍柴动力股份有限公司 | Temperature prediction method and device for frozen sand mold based on variable temperature environment |
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