CN110108378B - Assembly for multi-point fine temperature measurement in die in extrusion casting process and temperature measurement method - Google Patents
Assembly for multi-point fine temperature measurement in die in extrusion casting process and temperature measurement method Download PDFInfo
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- CN110108378B CN110108378B CN201910438619.3A CN201910438619A CN110108378B CN 110108378 B CN110108378 B CN 110108378B CN 201910438619 A CN201910438619 A CN 201910438619A CN 110108378 B CN110108378 B CN 110108378B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/023—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples provided with specially adapted connectors
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Abstract
The assembly comprises a temperature measuring assembly main body, an insert corresponding to a temperature measuring hole of the assembly, a solder wire storage tank, a solder wire, a thermocouple for temperature measurement, an assembly tail end cover plate and a bolt; after the insert is embedded into the temperature measuring hole of the component, the inner surface of the insert in the temperature measuring hole is the temperature measuring end surface of the component; the positions of the insert and the temperature measuring hole of the component, which correspond to the temperature measuring end surface of the component, are provided with storage grooves for storing the soldering tin wires, and the soldering tin wires are placed into the grooves before the insert is inserted into the temperature measuring hole of the component; fixing a thermocouple in the temperature measuring hole by using a tail end cover plate of the component and a bolt at the tail part of the component, and enabling the temperature measuring end of the thermocouple to tightly abut against the temperature measuring end face of the component; the subassembly is installed on the extrusion casting mould, and the mould temperature is higher among the extrusion casting process, leads to the lower solder wire of melting point to melt to make the temperature measurement end of thermocouple fully contact with the temperature measurement terminal surface in hole, realize accurate temperature measurement.
Description
Technical Field
The invention belongs to the field of metal casting forming technology and dies, and particularly relates to an assembly and a temperature measuring method for multi-point fine temperature measurement in a die in a metal extrusion casting process.
Background
The extrusion casting (also known as liquid forging) process is characterized in that the casting is tightly attached to the wall of the mold, and the metal is solidified under pressure. Therefore, the casting has high solidification and cooling speed, fine crystal grains, compact interior, very low shrinkage cavity and shrinkage porosity tendency, and can achieve the mechanical property close to that of a forged piece. Therefore, exploring the solidification process throughout the squeeze casting cycle requires accurate control of the casting-mold interface heat transfer mechanism. A very important parameter characterizing the interface heat exchange behavior is the Interface Heat Transfer Coefficient (IHTC), and the interface heat exchange coefficient h is defined as follows:
wherein q is the interface heat flux density, A is the interface area, TICIs the casting interface temperature, TIMThe temperature of the mold interface is shown, and R is the interface contact thermal resistance.
The research on the heat exchange coefficient of the casting process interface has been carried out for nearly 50 years. But the research on the heat exchange behavior of the interface in the extrusion casting process is slow. With the continuous development of the extrusion casting technology and the wide application of the corresponding casting in the fields of automobiles, aviation and the like, the accurate understanding and the control of the heat exchange process of the casting-casting interface are realized, so that the problems of controlling the casting process, saving energy and improving the quality of the casting are needed to be solved.
The inverse algorithm is the most common method for solving the heat transfer coefficient of the casting-casting interface. The core idea of the inverse algorithm is a method for solving unknown boundaries, internal heat sources or initial conditions by direct (linear problem) or iterative (non-linear problem) solution using measured temperature inside a study volume. Specifically, the basic idea of solving the interface heat transfer coefficient by an inverse algorithm is as follows: supposing that the surface heat flow value of the die cavity is a constant in a certain time interval, and an initial value, namely a die temperature field, is given at will, the calculated temperature values of all positions and all moments in the time period are obtained, the measured heat flow value in the time period is obtained by minimizing the sum of squares of the difference values of all measured temperatures and the calculated temperatures in the time period, and then the surface temperatures of the casting and the die are calculated, so that the heat exchange coefficient of the casting-casting interface is obtained. Therefore, how to accurately measure the temperature of different positions in the mold becomes the key for accurately calculating the heat exchange coefficient of the casting-mold interface.
Through the research and discovery of documents, the early research[1]Thermocouples are installed in the holes drilled in the casting mold to measure the temperature at different positions inside the casting mold. There are many difficulties and uncertainties: if the inner part of the mould casting is drilled with a blind hole, the accurate position far away from the surface of the mould is difficult to ensure; a thermocouple is arranged in the hole, so that the close fit of the thermocouple cannot be guaranteed; placing the thermocouple must bring local temperature field change, for reducing the temperature field change that the drilling brought, the blind hole is generally little and dark, and it is impractical on the temperature measurement section in the blind hole to weld the temperature measurement end. Existing research[2-4]The temperature of different positions in the casting mould is measured by adopting a temperature measuring component which can be arranged on the mouldThe thermocouples for warm use are usually welded or mechanically fixed in holes previously made in the temperature measuring assembly. The thermocouple is arranged in a welding mode, the defect that the manufacturing process is particularly complex still exists, and the thermocouple is easy to damage in the welding process, so that the damaged thermocouple cannot be replaced; although the mechanical fixing mode is simple, close fitting cannot be guaranteed, and temperature measurement is often inaccurate. Therefore, it is desirable to design a component that is relatively simple in manufacturing process while ensuring accurate temperature measurement.
[1]Trovant M,Argyropoulos S.Finding boundary conditions:A couplingstrategy for the modeling of metal casting processes:Part I.Experimentalstudy and correlation development[J].Metallurgical and Materials TransactionsB,2000,31B:75-86.
[2]Guo Z P,Xiong S M,et al.Determination of the heat transfercoefficient at metal–die interface of high pressure die casting process ofAM50alloy[J].International Journal of Heat and Mass Transfer,2008,51:6032-6038.
[3]Dour G,Dargusch M,Davidson C,et al.Development of a non-intrusiveheat transfer coefficient gauge and its application to high pressure diecasting:Effect of the process parameters[J].Journal of Materials ProcessingTechnology,2005,169:223-233.
[4]Sun Z,Hu H,Niu X.Determination of heat transfer coefficients byextrapolation and numerical inverse methods in squeeze casting of magnesiumalloy AM60[J].Journal of Materials Processing Technology,2011,211(8):1432-1440.
Disclosure of Invention
The invention aims to provide a component and a temperature measuring method which have relatively simple manufacturing process and can be used for multi-point fine temperature measurement in a die in the extrusion casting process, and the core idea and the characteristics are as follows: the thermocouple is fixed in a hole formed in the temperature measuring component in advance in a mechanical fixing mode, and meanwhile, the welding flux with a lower melting point is placed at the position where the temperature measuring end of the thermocouple is combined with the temperature measuring end face of the hole.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a component for multipoint fine temperature measurement in a die in an extrusion casting process comprises a temperature measurement component main body 3, wherein a plurality of component temperature measurement holes 2 which are uniformly distributed along the circumferential direction and are used for measuring temperatures of different positions of the die are axially formed in the temperature measurement component main body 3, inserts 1 with different lengths corresponding to the component temperature measurement holes 2 are embedded in the positions, close to the head of the temperature measurement component main body 3, of the component temperature measurement holes 2, the lengths of the inserts 1 corresponding to the component temperature measurement holes 2 are determined by the distance from the temperature measurement points of the die to the surface of a die cavity, and after the inserts 1 are embedded in the component temperature measurement holes 2, the inner surfaces, located in the component temperature measurement holes 2, of the; a solder wire storage groove 10 for storing solder wires 11 is processed in the insert 1 and the part of the component temperature measuring hole 2 close to the component temperature measuring end face 9, and the solder wires 11 are placed in the solder wire storage groove 10 before the insert 1 is inserted into the component temperature measuring hole 2; the thermocouple 4 for temperature measurement penetrates into the component temperature measurement hole 2, the thermocouple temperature measurement end 8 of the thermocouple 4 for temperature measurement is tightly propped against the component temperature measurement end face 9, so that the thermocouple temperature measurement end 8 is tightly attached to the component temperature measurement end face 9, the extending part of the thermocouple 4 for temperature measurement, which is positioned at the tail part of the temperature measurement component main body 3, is bent into a circular arc shape to form a thermocouple circular arc part 5, and is led out from a hole which is pre-opened in a cover plate 6 at the tail part of the temperature measurement component main body 3, the cover plate 6 is pressed onto the thermocouple circular arc part 5 through a bolt 7, when the cover plate 6 tightly presses the thermocouple circular arc part 5, a part of prestress is applied to the thermocouple temperature measurement end 8 in the component temperature measurement hole 2 through the thermocouple circular arc part 5, and the tight attachment.
Preferably, the temperature measuring component main body 3 is made of the same material as the mold material.
Preferably, the temperature measuring component main body 3 is a step-shaped cylindrical rod, and the diameter of the tail part of the temperature measuring component main body 3 is larger than that of the head part, so that the thermocouple 4 for measuring temperature can be conveniently bent into an arc shape.
Preferably, six component temperature measuring holes 2 which are uniformly distributed along the circumferential direction and are used for measuring the temperature of different positions of the die are axially formed in the temperature measuring component main body 3.
Preferably, the thermocouple 4 for temperature measurement is a sheathed thermocouple having elasticity.
Firstly, mounting the temperature-measuring component on a lower die 14 of the die to ensure that the head end surface 17 of the temperature-measuring component of a temperature-measuring component main body 3 is flush with the bottom surface 16 of a die cavity, and then leading out a thermocouple cluster 19 formed by a plurality of temperature-measuring thermocouples 4 through a data cable leading-out hole 20 on the lower die 14 to be connected with a data acquisition system 21; then, carrying out extrusion casting on the flat plate casting 15 between the upper die 13 and the lower die 14, and measuring and recording temperature measurement data of each casting period through a data acquisition system 21; in the process of extrusion casting of a slab casting 15, the temperature of the die is high, the solder wires 11 with low melting points in the solder wire storage grooves 10 are melted to form liquid solder 12, and the liquid solder 12 coats the thermocouple temperature measuring end 8 and the component temperature measuring end face 9, so that the thermocouple temperature measuring end 8 and the component temperature measuring end face 9 can be in sufficient contact with each other, and accurate temperature measurement is realized.
The thermocouple for measuring the temperature in the assembly is installed on the assembly in a mechanical fixing mode, is simple and convenient to install, is not easy to damage, is easy to disassemble, and can be repeatedly used and replaced. The die temperature is higher in the extrusion casting process, so that the solder wires with lower melting points in the storage tank in the assembly are melted, and the temperature measuring end of the thermocouple and the temperature measuring end face of the hole are completely coated by the liquid solder, so that the thermocouple can more accurately measure the temperature of the temperature measuring end face.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a cross-sectional view of the A-A plane of the present invention.
Fig. 3 is a partially enlarged view of a region a in fig. 1, in which fig. 3a is a view illustrating a normal temperature state, and fig. 3b is a view illustrating an extrusion casting process.
Fig. 4 is a schematic view of the installation of the present invention.
In the figure: 1-insert, 2-component temperature measuring hole, 3-temperature measuring component main body, 4-thermocouple for temperature measurement,
5-thermocouple arc part, 6-cover plate, 7-bolt, 8-thermocouple temperature measuring end, 9-component temperature measuring end face, 10-solder wire storage tank, 11-solder wire, 12-liquid solder, 13-upper die, 14-lower die, 15-flat casting, 16-die cavity bottom face, 17-temperature measuring component head end face, 18-ejector rod, 19-thermocouple cluster, 20-data cable leading-out hole and 21-data acquisition system.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 4, which are examples of measuring the temperature of different positions of a mold in an extrusion casting process of a slab casting by using the present invention in the following manner:
the invention relates to a component for multi-point fine temperature measurement in a die in an extrusion casting process, wherein a temperature measurement component main body 3 is a stepped cylindrical rod, and the manufacturing material of the temperature measurement component main body is the same as the die material and is made of H13 steel. 6 assembly temperature measuring holes 2 which are uniformly distributed along the circumferential direction are processed on the temperature measuring assembly main body 3 according to the A-A section. In order to measure the temperature of different positions of the die, inserts 1 with different lengths corresponding to the temperature measuring holes 2 are embedded in the positions, close to the heads of the temperature measuring component main bodies 3, of the component temperature measuring holes 2, the lengths of the inserts 1 corresponding to the component temperature measuring holes 2 are determined by the distance from the temperature measuring points of the die to the surface of the die cavity, and after the inserts 1 are embedded in the component temperature measuring holes 2, the inner surfaces, located in the component temperature measuring holes 2, of the inserts 1 are the component temperature measuring end surfaces 9. A solder wire storage groove 10 for storing solder wires 11 is processed in the insert 1 and the part of the component temperature measuring hole 2 close to the component temperature measuring end face 9, and the solder wires 11 are placed in the solder wire storage groove 10 before the insert 1 is inserted into the component temperature measuring hole 2. The thermocouple 4 for temperature measurement directly penetrates into the component temperature measurement hole 2, the thermocouple temperature measurement end 8 is tightly propped against the component temperature measurement end face 9, the thermocouple temperature measurement end 8 is tightly attached to the component temperature measurement end face 9, then the extending part of the thermocouple 4 for temperature measurement is bent into a circular arc shape to form a thermocouple circular arc part 5 at the tail part of the temperature measurement component main body 3 and is led out from a hole which is formed in advance in the cover plate 6, the cover plate 6 is pressed onto the thermocouple circular arc part 5 through the bolt 7, the thermocouple 4 for temperature measurement has certain elasticity for an armored thermocouple, when the thermocouple circular arc part 5 is tightly pressed by the cover plate 6, a part of prestress is applied to the thermocouple temperature measurement end 8 in the component temperature measurement hole 2 through the thermocouple circular arc part 5, and the tight attachment of the thermocouple temperature measurement end 8 and the component temperature measurement end face 9.
When the temperature of different positions in the die needs to be measured in the extrusion casting process, firstly, the temperature measuring assembly is arranged on the lower die 14 of the die, the head end face 17 of the temperature measuring assembly main body 3 is ensured to be flush with the bottom surface 16 of the die cavity, and then a thermocouple cluster 19 formed by a plurality of temperature measuring thermocouples 4 is led out through a data cable leading-out hole 20 on the lower die 14 and is connected with a data acquisition system 21. Then, extrusion casting of a slab casting between the upper mold 13 and the lower mold 14 can be performed, and temperature measurement data for each casting cycle is measured and recorded by the data acquisition system 21. In the process of squeeze casting of a slab casting, the temperature of a die is high, a solder wire 11 with a low melting point in a solder wire storage groove 10 is melted to form liquid solder 12, and the liquid solder 12 coats a thermocouple temperature measuring end 8 and an assembly temperature measuring end face 9, so that the thermocouple temperature measuring end 8 and the assembly temperature measuring end face 9 can be in sufficient contact with each other, and accurate temperature measurement is realized.
The above are merely embodiments of the present invention and should not be construed as limiting the present invention. The technical scheme adopted by the invention is equivalent to the technical scheme adopted by the invention, and the technical scheme is within the protection scope of the invention.
Claims (6)
1. The utility model provides an subassembly that is used for inside multiple spot meticulous temperature measurement of squeeze casting process mould which characterized in that: the temperature measurement device comprises a temperature measurement component main body (3), wherein a plurality of component temperature measurement holes (2) which are uniformly distributed along the circumferential direction and are used for measuring the temperatures of different positions of a die are axially formed in the temperature measurement component main body (3), inserts (1) with different lengths corresponding to the component temperature measurement holes (2) are embedded in the positions, close to the heads of the temperature measurement component main body (3), of the component temperature measurement holes (2), the lengths of the inserts (1) corresponding to the component temperature measurement holes (2) are determined by the distance from the temperature measurement point of the die to the surface of a die cavity, and after the inserts (1) are embedded into the component temperature measurement holes (2), the inner surfaces, located in the component temperature measurement holes (2), of the; a solder wire storage groove (10) for storing solder wires (11) is processed in the insert (1) and the part of the component temperature measuring hole (2) close to the component temperature measuring end surface (9), and the solder wires (11) are placed in the solder wire storage groove (10) before the insert (1) is inserted into the component temperature measuring hole (2); a thermocouple (4) for temperature measurement penetrates into the temperature measuring hole (2) of the assembly, the thermocouple temperature measuring end (8) of the thermocouple (4) for temperature measurement is tightly propped against the temperature measuring end surface (9) of the assembly, so that the temperature measuring end (8) of the thermocouple is tightly attached to the temperature measuring end surface (9) of the assembly, the extending part of the thermocouple (4) for temperature measurement positioned at the tail part of the temperature measuring assembly main body (3) is bent into a circular arc shape to form a thermocouple circular arc part (5), and is led out from a pre-opened hole on a cover plate (6) at the tail part of the temperature measuring component main body (3), the cover plate (6) is pressed on the thermocouple arc part (5) by a bolt (7), when the cover plate (6) presses the thermocouple arc part (5), a part of prestress is applied to the thermocouple temperature measuring end (8) in the component temperature measuring hole (2) through the thermocouple arc part (5), so that the thermocouple temperature measuring end (8) is ensured to be tightly attached to the component temperature measuring end face (9); in the casting process, the mold temperature is high, the solder wires (11) with low melting points in the solder wire storage tank (10) are melted to form liquid solder (12), and the liquid solder (12) coats the thermocouple temperature measuring end (8) and the component temperature measuring end face (9), so that the thermocouple temperature measuring end (8) and the component temperature measuring end face (9) can be in sufficient contact with each other, and accurate temperature measurement is realized.
2. The assembly of claim 1, wherein the assembly is adapted for multiple point fine thermometry inside a die of an extrusion casting process, and wherein: the temperature measuring component main body (3) is made of the same material as the die.
3. The assembly of claim 1, wherein the assembly is adapted for multiple point fine thermometry inside a die of an extrusion casting process, and wherein: the temperature measuring component main body (3) is a step-shaped cylindrical rod, and the diameter of the tail part of the temperature measuring component main body (3) is larger than that of the head part.
4. The assembly of claim 1, wherein the assembly is adapted for multiple point fine thermometry inside a die of an extrusion casting process, and wherein: six component temperature measuring holes (2) which are uniformly distributed along the circumferential direction and are used for measuring the temperatures of different positions of the die are axially formed in the temperature measuring component main body (3).
5. The assembly of claim 1, wherein the assembly is adapted for multiple point fine thermometry inside a die of an extrusion casting process, and wherein: the thermocouple (4) for measuring the temperature is an armored thermocouple with elasticity.
6. The method for measuring the temperature of an assembly for the multipoint fine temperature measurement inside a die in an extrusion casting process according to any one of claims 1 to 5, wherein: firstly, a temperature measuring assembly is arranged on a lower die (14) of a die, the head end face (17) of the temperature measuring assembly of a temperature measuring assembly main body (3) is enabled to be flush with the bottom surface (16) of a die cavity, and then a thermocouple cluster (19) formed by a plurality of temperature measuring thermocouples (4) is led out through a data cable leading-out hole (20) on the lower die (14) and is connected with a data acquisition system (21); then, carrying out extrusion casting on a plate casting (15) between the upper die (13) and the lower die (14), and measuring and recording temperature measurement data of each casting period through a data acquisition system (21); in the process of squeeze casting of a slab casting (15), the temperature of a die is high, a solder wire (11) with a low melting point in a solder wire storage groove (10) is melted to form liquid solder (12), and the liquid solder (12) coats a thermocouple temperature measuring end (8) and an assembly temperature measuring end face (9), so that the thermocouple temperature measuring end (8) and the assembly temperature measuring end face (9) can be in sufficient contact with each other, and accurate temperature measurement is realized.
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| CN112304457A (en) * | 2020-09-30 | 2021-02-02 | 成都标建铝业有限公司 | Temperature monitoring device of aluminum profile extrusion die |
| CN112378541B (en) * | 2020-10-26 | 2023-04-07 | 南京工业大学 | Wire-storable quick-response thermocouple |
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| CN1062038A (en) * | 1990-11-28 | 1992-06-17 | 天津市肿瘤医院 | Multi-point non-interference temp measure probe with non-metal lead wire |
| JP4274600B2 (en) * | 1998-06-17 | 2009-06-10 | 立山科学工業株式会社 | Cooking tool temperature detector |
| US9302306B2 (en) * | 2009-11-09 | 2016-04-05 | Toyota Jidosha Kabushiki Kaisha | Hot press mold, temperature measuring device, and hot press molding method |
| CN101927335B (en) * | 2010-08-06 | 2012-08-22 | 清华大学 | Mold capable of measuring internal temperature of castings directly in extrusion casting process |
| CN103033277B (en) * | 2012-12-07 | 2014-12-10 | 山东科技大学 | Device and method for evaluating relation of interface temperature and interface heat exchange coefficient |
| CN103487157B (en) * | 2013-10-14 | 2016-08-10 | 清华大学 | Sensor cluster for component for fine multipoint temperature measurement in metal die |
| CN104848953A (en) * | 2015-04-16 | 2015-08-19 | 派罗特克（深圳）高温材料有限公司 | Pipe plugging bulkhead thermocouple protective sleeve and processing method |
| CN106644131B (en) * | 2016-11-14 | 2019-03-26 | 北京临近空间飞行器系统工程研究所 | A kind of heat shield interlayer temperature and carbonizing degree duplex measurement device and method |
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