CN111368416A - Large-scale steel casting mold filling sensing correction method and system - Google Patents
Large-scale steel casting mold filling sensing correction method and system Download PDFInfo
- Publication number
- CN111368416A CN111368416A CN202010133395.8A CN202010133395A CN111368416A CN 111368416 A CN111368416 A CN 111368416A CN 202010133395 A CN202010133395 A CN 202010133395A CN 111368416 A CN111368416 A CN 111368416A
- Authority
- CN
- China
- Prior art keywords
- cuboid
- max
- subspace
- cavity
- space
- 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
Images
Landscapes
- Continuous Casting (AREA)
Abstract
The invention provides a large-scale steel casting mold filling sensing correction method and system. In the actual casting process, the time when the molten metal in the cavity reaches the characteristic point and the temperature change process of the molten metal at the characteristic point are obtained by embedding the thermocouple at the characteristic point, and the numerical simulation result is improved according to actually measured data, so that the numerical simulation model is closer to the high-temperature molten steel casting process, the mold filling and solidification phenomena are more accurately described, and the rationality of the simulation model is improved; physical parameters and boundary conditions of the alloy and the casting material are perfected, and the numerical simulation technology is promoted to be better applied to engineering in the cast steel; the actual position of the thermocouple is ensured to accurately correspond to the position of the characteristic point selected by computer simulation, so that the detected temperature has higher referential degree, and the rationality of the simulation model is further improved.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a method and a system for sensing and correcting the mold filling of a large-scale steel casting.
Background
More and more casting enterprises use casting digital simulation means to optimize the casting process. However, the casting numerical simulation technology still faces the problems of over-simplification of a physical model, incomplete alloy/casting material physical parameter database, difficulty in obtaining boundary conditions and the like.
The industry is always striving to improve the accuracy of casting numerical simulation, and the accurate measurement of the flow field and temperature field of the molten metal on the casting site is the basis of improving the simulation accuracy, but the work is also difficult. The invention with the application number of 201110384125.5 provides a method for simulating casting mold filling water, which adopts a hydraulic simulation test method to carry out simulation research and analysis on the casting process of a certain oversize aluminum alloy casting. However, the material adopted by the invention is over simplified, water is always in a liquid state at normal temperature, the kinematic viscosity is unchanged, and the representativeness of the aluminum water at about 700 ℃ is lost by simulating the aluminum water with water. The method can not simulate the flowing and mold filling behavior of the molten steel at the high temperature of 1600 ℃.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method and a system for sensing and correcting the filling of a large-scale steel casting.
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
The invention adopts the following technical scheme:
in a first aspect, a system for sensing and correcting the filling of a large steel casting is provided, which includes:
the dividing module is used for acquiring a divided space where a cavity in the numerical simulation model is located, dividing the divided space and dividing the divided space into a plurality of cuboid subspaces with the same size;
the numbering module is used for numbering the cuboid subspace internally containing the cavity to obtain a sequentially numbered target cuboid subspace;
the characteristic point position acquisition module is used for acquiring the coordinate values of the characteristic points contained in each target cuboid subspace;
the marking module is used for comparing the cavity part in each manufactured target cuboid subspace with the calibration device and marking the positions of the characteristic points contained in the target cuboid subspace on the cavity according to the coordinate values acquired by the characteristic point position acquisition module;
and the thermocouple is buried at the position marked by the marking module.
Wherein, a large-scale steel casting mould filling perception correction system still include: and the partition space confirmation module is used for limiting a cuboid as the partition space, and the left side edge, the right side edge, the top edge, the bottom edge, the front side edge and the rear side edge of the cavity in the numerical simulation model are respectively positioned on six surfaces of the limited cuboid.
Wherein, a large-scale steel casting mould filling perception correction system still include: and the coordinate system establishing module is used for establishing a space rectangular coordinate system by taking one vertex of each target cuboid subspace as an original point so as to enable the cavity in the target cuboid subspace to be positioned in the I-th divinator in the established space rectangular coordinate system.
Wherein, a large-scale steel casting mould filling perception correction system still include: and the random extraction module is used for randomly selecting a plurality of target cuboid subspaces as correction cuboid subspaces, selecting a correction characteristic point on a cavity in each manufactured correction cuboid subspace, and embedding a thermocouple at the position of each correction characteristic point.
The large steel casting mold filling sensing and correcting system comprises a data acquisition module, a model acquisition module and a model comparison module, wherein the data acquisition module is used for acquiring temperature data measured by thermocouples at the positions of 20 characteristic points in the steel casting pouring process; the comparison module is used for comparing the temperature data acquired by the data acquisition module with the simulation data; and the adjusting module is used for adjusting the physical parameters and boundary conditions of the alloy and the casting mold material according to the comparison result of the comparing module.
Wherein, thermocouple head cover is equipped with the carborundum protective sheath that thickness is 2mm, and thermocouple head salient sand mould surface 3 mm.
Wherein, calibration device includes: an X-direction calibration rod, a Y-direction calibration rod and a Z-direction calibration rod with scales; the X-direction calibration rod, the Y-direction calibration rod and the Z-direction calibration rod are intersected and mutually perpendicular to form a space rectangular coordinate system.
In a second aspect, the invention provides a method for sensing and correcting the mold filling of a large steel casting, which is characterized by comprising the following steps:
obtaining a division space where a cavity is located in a numerical simulation model, dividing the division space, and dividing the division space into a plurality of cuboid subspaces with the same size;
establishing a three-dimensional rectangular coordinate system with any point of the divided space as an origin, and taking X as the originstep、Ystep、ZstepSequentially dividing the division space along the X, Y, Z axis to obtain the grid number Nx、Ny、NzComprises the following steps:
wherein, X0,minAnd X0，maxIs the minimum and maximum dimensional coordinate values of the partitioned space along the X axis, Y0,minAnd Y0，maxIs a minimum and maximum dimension coordinate value, Z, of the partitioned space along the Y axis0,minAnd Z0，maxIs the minimum and maximum dimension coordinate values of the partitioned space along the Z axis;
Aj＝[(Xj，min，Xj，max)；(Yj，min，Yj，max)；(Zj，min，Zj，max)](j＝0-N)；
wherein, the cuboid subspace is labeled, and j represents the label of the cuboid subspace; n is the total number of cuboid subspaces, A0Representing a partitioned space; a. thejRepresents the jth cuboid subspace in the division space, (X)j，min，Xj，max) Representing a range of dimensions of the cuboid subspace along the X axis from a coordinate value Xj，minTo coordinate value Xj，max；(Yj，min，Yj，max) Representing a range of dimensions of the cuboid subspace along the Y axis from a coordinate value Yj，minTo coordinate value Yj，max；(Zj，min，Zj，max) Representing the range of dimensions of the cuboid subspace along the Z axis from a coordinate value Zj，minTo coordinate value Zj，max；
F (X) is a cost function of the cuboid subspace obtained by dividing along the X axis, F (Y) is a cost function of the cuboid subspace obtained by dividing along the Y axis, and F (Z) is a cost function of the cuboid subspace obtained by dividing along the Z axis; mj，x、Mj，y、Mj，zWhether the jth cuboid subspace of the cuboid subspaces respectively obtained by dividing along the X, Y, Z axes contains a cavity or not is shown, and M is shownj，x＝1、Mj，y＝1、Mj，z1, if not included, Mj，x＝0、Mj，y＝0、Mj，z＝0；Nj，x、Nj，y、Nj，zWhether the jth cuboid subspace in the cuboid subspaces obtained by dividing along the X, Y, Z axis is a cavity or not is shown; the relationship is as follows:
whether each cuboid subspace contains a cavity or not is measured by a cost function after a given division space is divided;
numbering cuboid subspaces with cavities inside to obtain sequentially numbered target cuboid subspaces;
obtaining the coordinate value of the characteristic point contained in each target cuboid subspace;
comparing the cavity part in each manufactured target cuboid subspace with a calibration device, and marking the positions of the characteristic points contained in the target cuboid subspace on the cavity according to the obtained coordinate values;
thermocouples were buried at the marked locations.
The method for sensing and correcting the filling type of the large steel casting further comprises the following steps: defining a cuboid as the partition space, wherein the left side edge, the right side edge, the top edge, the bottom edge, the front side edge and the rear side edge of a cavity in the numerical simulation model are respectively positioned on six surfaces of the defined cuboid; and establishing a space rectangular coordinate system by taking one vertex of each target cuboid subspace as an original point, so that the cavity in the target cuboid subspace is positioned in the I divinatory limit in the established space rectangular coordinate system. B isi＝[(Xi，min，Xi，max)；(Yi，min，Yi，max)；(Zi，min，Zi，max)](i＝0-N)；
Wherein i represents the number of the target cuboid subspace; n is the total number of target cuboid subspaces, B0Representing an origin; b isiRepresents the ith target cuboid subspace in the division space, (X)j，min，Xj，max) Representing a range of dimensions of the target cuboid subspace along the X axis from a coordinate value Xi，minTo coordinate value Xi，max，(Yi，min，Yi，max) Representing a range of dimensions of the target cuboid subspace along the Y axis from a coordinate value Yi，minTo coordinate value Yi，max；(Zi，min，Zi，max) Representing a range of dimensions of the target cuboid subspace along the Z axis from a coordinate value Zi，minTo coordinate value Zi，max。
The method comprises the following steps of acquiring temperature data measured by thermocouples at the positions of 20 characteristic points in the casting process of the steel casting; comparing the collected temperature data with the simulation data; and adjusting the physical parameters and boundary conditions of the alloy and the casting material according to the comparison result.
The invention has the following beneficial effects: in the actual casting process, the time when the molten metal in the cavity reaches the characteristic point and the temperature change process of the molten metal at the characteristic point are obtained by embedding the thermocouple at the characteristic point, and the numerical simulation result is improved according to actually measured data, so that the numerical simulation model is closer to the high-temperature molten steel casting process, the mold filling and solidification phenomena are more accurately described, and the rationality of the simulation model is improved; physical parameters and boundary conditions of the alloy and the casting material are perfected, and the numerical simulation technology is promoted to be better applied to engineering in the cast steel; the actual position of the thermocouple is ensured to accurately correspond to the position of the characteristic point selected by computer simulation, so that the detected temperature has higher referential degree, and the rationality of the simulation model is further improved.
Drawings
FIG. 1 is a schematic diagram of a large steel casting mold filling sensing and correcting system according to the present invention;
FIG. 2 is a schematic diagram of a partitioned space of the present invention;
FIG. 3 is a schematic illustration of a rectangular parallelepiped subspace of interest in accordance with the present invention;
FIG. 4 is a schematic view of a calibration arrangement of the present invention;
FIG. 5 is a schematic flow chart of a method for sensing and correcting the filling of a large steel casting according to the present invention;
FIG. 6 is an illustration of one configuration of a mold cavity;
fig. 7 is a schematic view of the structure at the thermocouple.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others.
If improve simulation accuracy through the mode of gathering the temperature in actual casting process, then need select the position according to the simulation result in advance to when the casting mould is moulded, the position that corresponds the selection sets up temperature measuring device, but the technical problem that this process exists is that can't accurately correspond to the position that the computer simulation selected when actually setting up temperature measuring device for but the temperature reference degree that detects reduces, influences numerical simulation result finally.
In some illustrative embodiments, as shown in fig. 1, the present disclosure provides a large steel casting mold filling perception correction system, comprising: the device comprises a characteristic point selection module, a partition space confirmation module, a division module, a numbering module, a coordinate system establishment module, a characteristic point position acquisition module, a marking module, a thermocouple, a data acquisition module, a comparison module and an adjustment module.
The large-scale steel casting mold filling sensing correction system displays a flow field and a temperature field of molten steel in a steel casting process by using a digital simulation technology, and particularly can realize numerical simulation at a computer end through ProCAST, MAGMA or ANYCASTING.
The characteristic points are selected according to the actual casting, the position of an inner sprue, the far end in a cavity and the root of a riser, and 20 points are selected together to measure the temperature change condition of molten steel flowing through each characteristic point.
And a division space confirmation module for defining a rectangular parallelepiped as the division space 201, the cavity 202 in the numerical simulation model being located in the defined rectangular parallelepiped, i.e., in the division space 201. The cavity 202 may have any shape, and for the convenience of understanding the technical solution, a cavity with a simpler shape may be used for demonstration as shown in fig. 2. In actual production, the shape of the cavity is often as shown in fig. 6. As shown in fig. 2, the left side edge, the right side edge, the top edge, the bottom edge, the front side edge and the rear side edge of the cavity 202 in the numerical simulation model are respectively located on six surfaces of the defined rectangular parallelepiped, i.e. the cavity 202 is completely matched with the partition space 201, and the situation that the partition module partitions more rectangular parallelepiped subspaces without the cavity, which causes resource waste and affects the data processing speed of the system is avoided. The edge of the cavity referred to in the partitioned space confirmation module may be a point, a line, or a plane, depending on the specific shape of the cavity 202.
The dividing module is configured to obtain a division space 201 where a cavity is located in the numerical simulation model, divide the division space 201, and divide the division space 201 into a plurality of rectangular parallelepiped subspaces 203 with the same size, that is, the division space 201 is formed by combining a plurality of rectangular parallelepiped subspaces 203, so that the dividing module also divides the cavity 202 into a plurality of units, and the divided cavities 202 are distributed in each rectangular parallelepiped subspace 203.
A cavity is present in one part of the rectangular parallelepiped sub-space 203, and the other part of the rectangular parallelepiped sub-space 203 is empty, specifically, determined by the specific shape of the cavity 202.
And the numbering module is used for numbering the cuboid subspace 203 with the inside containing the cavity to obtain a target cuboid subspace numbered sequentially, namely the cuboid subspace 203 with the inside containing the cavity can be used as a target cuboid subspace.
After the cutting and numbering operations are completed, the mold cavity in the target cuboid subspace can be manufactured according to the shape of the mold cavity to manufacture a plurality of solid mold cavities, and the manufactured solid mold cavities are combined into an integral mold cavity in the modes of pressing, bonding, assembling and the like. Because the numbering is carried out in advance, the assembly according to the numbering sequence can facilitate the assembly of the solid cavity; in addition, the marking of the position of the subsequent characteristic point is facilitated, and errors are not easy to occur.
And the coordinate system establishing module is used for establishing a space rectangular coordinate system by taking one vertex of each target cuboid subspace as an original point, so that the cavity in the target cuboid subspace is positioned in the I-th octagon in the established space rectangular coordinate system, as shown in fig. 3, and each target cuboid subspace corresponds to one space rectangular coordinate system. Therefore, the position of each divided cavity in each target cuboid subspace can be determined through the established rectangular space coordinate system, preferably, the coordinate system establishing module is further used for obtaining the coordinate values of the boundary points of the cavities in the target cuboid subspace, and the manufactured entity cavities can be conveniently compared with the calibration device.
And the characteristic point position acquisition module is used for acquiring the coordinate values of the characteristic points contained in each target cuboid subspace.
The marking module is used for comparing the cavity part in each manufactured target cuboid subspace with the calibration device, namely comparing the entity cavity manufactured according to the cavity divided by the computer end with the calibration device.
As shown in fig. 4, the calibration apparatus includes: an X-direction calibration rod 401, a Y-direction calibration rod 402 and a Z-direction calibration rod 403. The X-direction calibration rod 401, the Y-direction calibration rod 402 and the Z-direction calibration rod 403 are intersected and mutually perpendicular to form a space rectangular coordinate system. The X-direction calibration rod 401, the Y-direction calibration rod 402 and the Z-direction calibration rod 403 are provided with scales, when the coordinates of the boundary points of the physical cavity are known, the physical cavity can be accurately placed in the calibration device according to the coordinates, and the coordinate values of the characteristic points are also known, so that the position of the physical characteristic points can be accurately marked on the physical cavity.
As shown in fig. 7, a thermocouple 114 is buried at a position marked by the marking module to measure a temperature change of molten steel flowing through each characteristic point during an actual casting process. The head of the thermocouple 114 is sleeved with a silicon carbide protective sleeve 113 with the thickness of 2mm, and the head of the thermocouple 114 protrudes out of the surface of the sand mold 112 by 3mm, so that the head of the thermocouple 114 is positioned in the cavity 202.
The data acquisition module is used for acquiring temperature data measured by thermocouples at the positions of the 20 characteristic points in the steel casting pouring process; the data acquisition module is a temperature recorder.
The comparison module is used for comparing the temperature data acquired by the data acquisition module with the simulation data; the simulation data is obtained by casting simulation software of a computer. The comparison method is to draw a curve graph according to the change of the temperature along with the time, so that the temperature curve graph of the entity measurement and the temperature curve graph simulated by the computer can be obtained, and the comparison result can be obtained by comparing the two temperature curve graphs.
And the adjusting module is used for adjusting the physical parameters and the boundary conditions of the alloy and the casting mold materials according to the comparison result of the comparison module, so that the simulation result is closer to the actually measured data, and the database of the physical parameters and the boundary conditions of the alloy and the casting mold materials is perfected by taking the actually measured data as a target. And a more accurate numerical simulation result is obtained, so that the numerical simulation model is closer to the casting process of high-temperature molten steel, the mold filling and solidification phenomena are more accurately described, and the rationality of the simulation model is improved.
The invention also includes: and the random extraction module is used for randomly selecting a plurality of target cuboid subspaces as correction cuboid subspaces, selecting a correction characteristic point on the solid cavity in each manufactured correction cuboid subspace, wherein the selection of the correction characteristic points can be selected according to human experience, and a thermocouple is embedded in the position of each correction characteristic point. The data acquisition module acquires the acquisition numerical value of the thermocouple on the characteristic point and also acquires the acquisition numerical value of the thermocouple on the correction characteristic point, and the coordinate value of the correction characteristic point can be acquired according to the calibration device, so that the position of the correction characteristic point can be corresponded on a casting model at a computer end, the temperature change at the correction characteristic point is simulated, and the correction result of the adjustment module is more accurate through reverse selection.
In some illustrative embodiments, as shown in fig. 5, the present disclosure provides a method for modifying the mold filling perception of a large steel casting, comprising:
s1: and (4) selecting the characteristic points.
The characteristic points are selected according to the actual casting, the position of an inner sprue, the far end in a cavity and the root of a riser, and 20 points are selected together to measure the temperature change condition of molten steel flowing through each characteristic point.
S2: a partitioned space is defined.
For defining a rectangular parallelepiped as the division space 201, the cavity 202 in the numerical simulation model is located in the defined rectangular parallelepiped, that is, in the division space 201. As shown in fig. 2, the left side edge, the right side edge, the top edge, the bottom edge, the front side edge and the rear side edge of the cavity 202 in the numerical simulation model are respectively located on six defined surfaces of the rectangular parallelepiped, i.e. the cavity 202 is completely matched with the partitioned space 201, and a large number of rectangular parallelepiped subspaces not containing the cavity are avoided being partitioned, so that resource waste is caused, and the data processing speed of the system is influenced. The edge of the cavity referred to as S2 may be a point, a line, or a plane, subject to the particular shape of the cavity 202.
S3: and dividing the division space.
The method is used for obtaining a division space 201 where a cavity is located in the numerical simulation model, dividing the division space 201 into a plurality of rectangular parallelepiped subspaces 203 with the same size, namely, the division space 201 is formed by combining a plurality of rectangular parallelepiped subspaces 203, so that the cavity 202 is also divided into a plurality of units, and the divided cavities 202 are distributed in the rectangular parallelepiped subspaces 203.
A cavity is present in one part of the rectangular parallelepiped sub-space 203, and the other part of the rectangular parallelepiped sub-space 203 is empty, specifically, determined by the specific shape of the cavity 202. Establishing a three-dimensional rectangular coordinate system with any point of the divided space as an origin, and taking X as the originstep、Ystep、ZstepSequentially dividing the division space along the X, Y, Z axis to obtain the grid number Nx、Ny、NzComprises the following steps:
wherein, X0,minAnd X0，maxIs the minimum and maximum dimensional coordinate values of the partitioned space along the X axis, Y0,minAnd Y0，maxIs a minimum and maximum dimension coordinate value, Z, of the partitioned space along the Y axis0,minAnd Z0，maxIs the minimum and maximum dimension coordinate values of the partitioned space along the Z axis;
Aj＝[(Xj，min，Xj，max)；(Yj，min，Yj，max)；(Zj，min，Zj，max)](j＝0-N)；
wherein, the cuboid subspace is labeled, and j represents the label of the cuboid subspace; n is the total number of cuboid subspaces, A0Representing a partitioned space; a. thejRepresents the jth cuboid subspace in the division space, (X)j，min，Xj，max) Representing a range of dimensions of the cuboid subspace along the X axis from a coordinate value Xj，minTo coordinate value Xj，max；(Yj，min，Yj，max) Representing a range of dimensions of the cuboid subspace along the Y axis from a coordinate value Yj，minTo coordinate value Yj，max；(Zj，min，Zj，max) Representing the range of dimensions of the cuboid subspace along the Z axis from a coordinate value Zj，minTo coordinate value Zj，max；
F (X) is a cost function of the cuboid subspace obtained by dividing along the X axis, F (Y) is a cost function of the cuboid subspace obtained by dividing along the Y axis, and F (Z) is a cost function of the cuboid subspace obtained by dividing along the Z axis; mj，x、Mj，y、Mj，zWhether the jth cuboid subspace of the cuboid subspaces respectively obtained by dividing along the X, Y, Z axes contains a cavity or not is shown, and M is shownj，x＝1、Mj，y＝1、Mj，z1, if not included, Mj，x＝0、Mj，y＝0、Mj，z＝0；Nj，x、Nj，y、Nj，zWhether the jth cuboid subspace in the cuboid subspaces obtained by dividing along the X, Y, Z axis is a cavity or not is shown; the relationship is as follows:
and (4) whether each cuboid subspace contains a cavity or not is measured by a cost function after a given division space is divided.
S4: and (6) numbering.
The cuboid subspaces 203 with the cavities therein are numbered to obtain sequentially numbered target cuboid subspaces, namely the cuboid subspaces 203 with the cavities therein can be used as the target cuboid subspaces.
After the cutting and numbering operations are completed, the mold cavity in the target cuboid subspace can be manufactured according to the shape of the mold cavity to manufacture a plurality of solid mold cavities, and the manufactured solid mold cavities are combined into an integral mold cavity in the modes of pressing, bonding, assembling and the like. Because the numbering is carried out in advance, the assembly according to the numbering sequence can facilitate the assembly of the solid cavity; in addition, the marking of the position of the subsequent characteristic point is facilitated, and errors are not easy to occur.
S5: and establishing a coordinate system.
Establishing a space rectangular coordinate system by taking one vertex of each target cuboid subspace as an original point, so that a cavity in the target cuboid subspace is positioned in the I divinatory limit in the established space rectangular coordinate system, Bi＝[(Xi，min，Xi，max)；(Yi，min，Yi，max)；(Zi，min，Zi，max)](i＝0-N)；
Wherein i represents the number of the target cuboid subspace; n is the total number of target cuboid subspaces, B0Representing an origin; b isiRepresents the ith target cuboid subspace in the division space, (X)j，min，Xj，max) Representing a range of dimensions of the target cuboid subspace along the X axis from a coordinate value Xi，minTo coordinate value Xi，max，(Yi，min，Yi，max) Representing a range of dimensions of the target cuboid subspace along the Y axis from a coordinate value Yi，minTo coordinate value Yi，max；(Zi，min，Zi，max) Representing a range of dimensions of the target cuboid subspace along the Z axis from a coordinate value Zi，minTo coordinate value Zi，max。
As shown in fig. 3, each target cuboid subspace corresponds to a spatial rectangular coordinate system. Therefore, the position of each divided cavity in each target cuboid subspace can be determined through the established rectangular space coordinate system, preferably, the coordinate values of the boundary points of the cavities in the target cuboid subspace are obtained, and the manufactured entity cavities are conveniently compared with the calibration device.
S6: and acquiring the position of the feature point.
And acquiring coordinate values of the feature points contained in each target cuboid subspace, wherein the feature points are positioned on the die cavity, and the target cuboid subspace is scaled by a coordinate system, so that the coordinates of the feature points can be acquired.
S7: and marking the characteristic points.
Comparing the cavity part in each manufactured target cuboid subspace with the calibration device, namely comparing the entity cavity manufactured according to the cavity divided by the computer end with the calibration device, and marking the position of the characteristic point contained in the target cuboid subspace on the entity cavity according to the coordinate value when the entity cavity is positioned in the calibration device because the coordinate value of the characteristic point is obtained.
As shown in fig. 4, the calibration apparatus includes: an X-direction calibration rod 401, a Y-direction calibration rod 402 and a Z-direction calibration rod 403. The X-direction calibration rod 401, the Y-direction calibration rod 402 and the Z-direction calibration rod 403 are intersected and mutually perpendicular to form a space rectangular coordinate system. The X-direction calibration rod 401, the Y-direction calibration rod 402 and the Z-direction calibration rod 403 are provided with scales, when the coordinates of the boundary points of the physical cavity are known, the physical cavity can be accurately placed in the calibration device according to the coordinates, and the coordinate values of the characteristic points are also known, so that the position of the physical characteristic points can be accurately marked on the physical cavity.
S8: and embedding a thermocouple at the marked position to measure the temperature change condition of molten steel flowing through each characteristic point in the actual pouring process.
S9: temperature data is acquired.
And acquiring temperature data measured by thermocouples at the positions of the 20 characteristic points in the casting process of the steel casting.
S10: and (6) comparison.
The system is used for comparing the collected temperature data with the simulation data; the simulation data is obtained by casting simulation software of a computer. The comparison method is to draw a curve graph according to the change of the temperature along with the time, so that the temperature curve graph of the entity measurement and the temperature curve graph simulated by the computer can be obtained, and the comparison result can be obtained by comparing the two temperature curve graphs.
S11: adjusting the physical parameters and boundary conditions of the alloy and the casting material.
And (4) adjusting the physical parameters and boundary conditions of the alloy and the casting material according to the comparison result obtained in the step (S10) to enable the simulation result to be closer to the actually measured data, and perfecting a database of the physical parameters and the boundary conditions of the alloy and the casting material by taking the actually measured data as a target. And a more accurate numerical simulation result is obtained, so that the numerical simulation model is closer to the casting process of high-temperature molten steel, the mold filling and solidification phenomena are more accurately described, and the rationality of the simulation model is improved.
S12: and (5) reversely selecting and simulating the characteristic points.
Randomly selecting a plurality of target cuboid subspaces as correction cuboid subspaces, selecting a correction characteristic point on a solid cavity in each manufactured correction cuboid subspace, wherein the selection of the correction characteristic points can be selected according to human experience, and a thermocouple is embedded in the position of each correction characteristic point. The method comprises the steps of acquiring acquisition values of thermocouples on characteristic points, acquiring acquisition values of the thermocouples on correction characteristic points, acquiring coordinate values of the correction characteristic points according to a calibration device, enabling the casting model at a computer end to correspond to the positions of the correction characteristic points, simulating temperature changes at the correction characteristic points, and enabling correction results to be more accurate through reverse selection.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
Claims (10)
1. A large-scale steel casting mold filling perception correction method is characterized by comprising the following steps:
obtaining a division space where a cavity is located in a numerical simulation model, dividing the division space, and dividing the division space into a plurality of cuboid subspaces with the same size;
establishing a three-dimensional rectangular coordinate system with any point of the divided space as an origin, and taking X as the originstep、Ystep、ZstepSequentially dividing the division space along the X, Y, Z axis to obtain the grid number Nx、Ny、NzComprises the following steps:
wherein, X0,minAnd X0，maxIs the minimum and maximum dimensional coordinate values of the partitioned space along the X axis, Y0,minAnd Y0，maxIs a minimum and maximum dimension coordinate value, Z, of the partitioned space along the Y axis0,minAnd Z0，maxIs the minimum and maximum dimension coordinate values of the partitioned space along the Z axis;
Aj＝[(Xj，min，Xj，max)；(Yj，min，Yj，max)；(Zj，min，Zj，max)](j＝0-N)；
wherein, the cuboid subspace is labeled, and j represents the label of the cuboid subspace; n is the total number of cuboid subspaces, A0Representing a partitioned space; a. thejRepresents the jth cuboid subspace in the division space, (X)j，min，Xj，max) Representing a range of dimensions of the cuboid subspace along the X axis from a coordinate value Xj，minTo coordinate value Xj，max；(Yj，min，Yj，max) Representing a range of dimensions of the cuboid subspace along the Y axis from a coordinate value Yj，minTo coordinate value Yj，max；(Zj，min，Zj，max) Representing the range of dimensions of the cuboid subspace along the Z axis from a coordinate value Zj，minTo coordinate value Zj，max；
F (X) is a cost function of the cuboid subspace obtained by dividing along the X axis, F (Y) is a cost function of the cuboid subspace obtained by dividing along the Y axis, and F (Z) is a cost function of the cuboid subspace obtained by dividing along the Z axis; mj，x、Mj，y、Mj，zWhether the jth cuboid subspace of the cuboid subspaces respectively obtained by dividing along the X, Y, Z axes contains a cavity or not is shown, and M is shownj，x＝1、Mj，y＝1、Mj，z1, if not included, Mj，x＝0、Mj，y＝0、Mj，z＝0；Nj，x、Nj，y、Nj，zWhether the jth cuboid subspace in the cuboid subspaces obtained by dividing along the X, Y, Z axis is a cavity or not is shown; the relationship is as follows:
whether each cuboid subspace contains a cavity or not is measured by a cost function after a given division space is divided;
numbering cuboid subspaces with cavities inside to obtain sequentially numbered target cuboid subspaces;
obtaining the coordinate value of the characteristic point contained in each target cuboid subspace;
comparing the cavity part in each manufactured target cuboid subspace with a calibration device, and marking the positions of the characteristic points contained in the target cuboid subspace on the cavity according to the obtained coordinate values;
thermocouples were buried at the marked locations.
2. The method for sensing and correcting the mold filling of the large steel casting according to claim 1, further comprising:
defining a cuboid as the partition space, wherein the left side edge, the right side edge, the top edge, the bottom edge, the front side edge and the rear side edge of a cavity in the numerical simulation model are respectively positioned on six surfaces of the defined cuboid;
establishing a space rectangular coordinate system by taking one vertex of each target cuboid subspace as an original point, so that a cavity in the target cuboid subspace is positioned in the I divinatory limit in the established space rectangular coordinate system;
Bi＝[(Xi，min，Xi，max)；(Yi，min，Yi，max)；(Zi，min，Zi，max)](i＝0-N)；
wherein i represents the number of the target cuboid subspace; n is the total number of target cuboid subspaces, B0Representing an origin; b isiRepresents the ith target cuboid subspace in the division space, (X)j，min，Xj，max) Representing a range of dimensions of the target cuboid subspace along the X axis from a coordinate value Xi，minTo coordinate value Xi，max，(Yi，min，Yi，max) Representing a range of dimensions of the target cuboid subspace along the Y axis from a coordinate value Yi，minTo coordinate value Yi，max；(Zi，min，Zi，max) Representing a range of dimensions of the target cuboid subspace along the Z axis from a coordinate value Zi，minTo coordinate value Zi，max。
3. The method for sensing and correcting the mold filling of the large steel casting according to claim 2, further comprising:
acquiring temperature data measured by thermocouples at the positions of 20 characteristic points in the casting process of the steel casting;
comparing the collected temperature data with the simulation data;
and adjusting the physical parameters and boundary conditions of the alloy and the casting material according to the comparison result.
4. A large-scale steel casting mold filling perception correction system is characterized by comprising:
the dividing module is used for acquiring a divided space where a cavity in the numerical simulation model is located, dividing the divided space and dividing the divided space into a plurality of cuboid subspaces with the same size;
the numbering module is used for numbering the cuboid subspace internally containing the cavity to obtain a sequentially numbered target cuboid subspace;
the characteristic point position acquisition module is used for acquiring the coordinate values of the characteristic points contained in each target cuboid subspace;
the marking module is used for comparing the cavity part in each manufactured target cuboid subspace with the calibration device and marking the positions of the characteristic points contained in the target cuboid subspace on the cavity according to the coordinate values acquired by the characteristic point position acquisition module;
and the thermocouple is buried at the position marked by the marking module.
5. The system of claim 4, further comprising: and the partition space confirmation module is used for limiting a cuboid as the partition space, and the left side edge, the right side edge, the top edge, the bottom edge, the front side edge and the rear side edge of the cavity in the numerical simulation model are respectively positioned on six surfaces of the limited cuboid.
6. The system of claim 5, further comprising: and the coordinate system establishing module is used for establishing a space rectangular coordinate system by taking one vertex of each target cuboid subspace as an original point so as to enable the cavity in the target cuboid subspace to be positioned in the I-th divinator in the established space rectangular coordinate system.
7. The system of claim 6, further comprising: and the random extraction module is used for randomly selecting a plurality of target cuboid subspaces as correction cuboid subspaces, selecting a correction characteristic point on a cavity in each manufactured correction cuboid subspace, and embedding a thermocouple at the position of each correction characteristic point.
8. The system for sensing and correcting the filling of the large steel casting according to claim 6 or 7, further comprising:
the data acquisition module is used for acquiring temperature data measured by thermocouples at the positions of the 20 characteristic points in the steel casting pouring process;
the comparison module is used for comparing the temperature data acquired by the data acquisition module with the simulation data;
and the adjusting module is used for adjusting the physical parameters and boundary conditions of the alloy and the casting mold material according to the comparison result of the comparing module.
9. The large-scale steel casting mold filling sensing and correcting system according to claim 8, wherein the thermocouple head is sleeved with a silicon carbide protective sleeve with the thickness of 2mm, and the thermocouple head protrudes out of the surface of the sand mold by 3 mm.
10. The system of claim 9, wherein the calibration device comprises: an X-direction calibration rod, a Y-direction calibration rod and a Z-direction calibration rod with scales; the X-direction calibration rod, the Y-direction calibration rod and the Z-direction calibration rod are intersected and mutually perpendicular to form a space rectangular coordinate system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010133395.8A CN111368416B (en) | 2020-03-02 | 2020-03-02 | Large-scale steel casting mold filling sensing correction method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010133395.8A CN111368416B (en) | 2020-03-02 | 2020-03-02 | Large-scale steel casting mold filling sensing correction method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111368416A true CN111368416A (en) | 2020-07-03 |
| CN111368416B CN111368416B (en) | 2020-11-13 |
Family
ID=71210261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010133395.8A Active CN111368416B (en) | 2020-03-02 | 2020-03-02 | Large-scale steel casting mold filling sensing correction method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111368416B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112024834A (en) * | 2020-09-01 | 2020-12-04 | 三鑫重工机械有限公司 | 4D printing system for steel ingot production |
| CN117171895A (en) * | 2023-11-03 | 2023-12-05 | 南通海泰科特精密材料有限公司 | Method and system for improving simulation accuracy of solidcast |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1670233A (en) * | 2004-02-12 | 2005-09-21 | 科技有限责任公司 | Process for producing cast pieces of spheroidal graphite with high geometrical and dimensional precision and improved mechanical properties |
| CN102073769A (en) * | 2011-01-12 | 2011-05-25 | 山东大学 | Method for quickly predicting casting hot spot |
| WO2012107143A1 (en) * | 2011-02-07 | 2012-08-16 | Siemens Vai Metals Technologies Gmbh | Method for regulating a temperature of a strand by positioning a movable cooling nozzle in a strand guide of a strand casting system |
| CN103624218A (en) * | 2013-10-25 | 2014-03-12 | 宝鸡石油机械有限责任公司 | Casting method of hollow crankshaft of slurry pump |
| CN105302985B (en) * | 2015-11-12 | 2018-01-30 | 哈尔滨工业大学 | A kind of emulation mode of the micro- cast form process of alloy based on fluent softwares |
| CN108326270A (en) * | 2018-03-08 | 2018-07-27 | 三鑫重工机械有限公司 | A kind of pouring procedure of supercritical turbine valve casing steel-casting |
| CN110059738A (en) * | 2019-04-11 | 2019-07-26 | 清华大学深圳研究生院 | A kind of method for early warning and system of quality of die casting |
-
2020
- 2020-03-02 CN CN202010133395.8A patent/CN111368416B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1670233A (en) * | 2004-02-12 | 2005-09-21 | 科技有限责任公司 | Process for producing cast pieces of spheroidal graphite with high geometrical and dimensional precision and improved mechanical properties |
| CN102073769A (en) * | 2011-01-12 | 2011-05-25 | 山东大学 | Method for quickly predicting casting hot spot |
| WO2012107143A1 (en) * | 2011-02-07 | 2012-08-16 | Siemens Vai Metals Technologies Gmbh | Method for regulating a temperature of a strand by positioning a movable cooling nozzle in a strand guide of a strand casting system |
| CN103624218A (en) * | 2013-10-25 | 2014-03-12 | 宝鸡石油机械有限责任公司 | Casting method of hollow crankshaft of slurry pump |
| CN105302985B (en) * | 2015-11-12 | 2018-01-30 | 哈尔滨工业大学 | A kind of emulation mode of the micro- cast form process of alloy based on fluent softwares |
| CN108326270A (en) * | 2018-03-08 | 2018-07-27 | 三鑫重工机械有限公司 | A kind of pouring procedure of supercritical turbine valve casing steel-casting |
| CN110059738A (en) * | 2019-04-11 | 2019-07-26 | 清华大学深圳研究生院 | A kind of method for early warning and system of quality of die casting |
Non-Patent Citations (3)
| Title |
|---|
| ZHENPING JI等: "Multi-Objective Optimization of Continuous Casting Billet Based on Ant Colony System Algorithm", 《IEEEXPLORE》 * |
| 罗蓬等: "铸铁凸轮轴阶梯式浇注系统智能参数化CAD研究", 《铸造》 * |
| 谈绍熙等: "一种在铸件缺陷识别中的区域分形分割方法", 《中国图象图形学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112024834A (en) * | 2020-09-01 | 2020-12-04 | 三鑫重工机械有限公司 | 4D printing system for steel ingot production |
| CN117171895A (en) * | 2023-11-03 | 2023-12-05 | 南通海泰科特精密材料有限公司 | Method and system for improving simulation accuracy of solidcast |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111368416B (en) | 2020-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111274671B (en) | Precise repair method for complex product assembly process based on digital twin and operation system thereof | |
| CN107672180B (en) | A kind of 3D printing accuracy checking method based on reverse Engineering Technology | |
| CN108312547A (en) | The method for monitoring part shape in real time during increasing material manufacturing | |
| Yarlagadda et al. | Statistical analysis on accuracy of wax patterns used in investment casting process | |
| CN111368416B (en) | Large-scale steel casting mold filling sensing correction method and system | |
| CN104002482B (en) | The print parameters method to set up of three-dimensional printer and device | |
| CN109579733B (en) | Method for rapidly measuring and calculating laser 3D printing forming dimensional precision | |
| CN107577874B (en) | A kind of determination method of hollow turbine vane investment casting mould design shrinking percentage | |
| CN106570303A (en) | User defined feature-based wallboard part MBD procedure model designing method | |
| CN112924065A (en) | Measuring method for measuring residual stress of curved surface based on blind hole method | |
| CN110044507B (en) | Sand casting accurate temperature measurement method based on temperature measurement unit positioning | |
| CN112642997A (en) | Method for confirming boundary heat exchange system in casting | |
| CN110986815A (en) | Tunnel construction monitoring and measuring method based on three-dimensional laser point cloud | |
| CN109731946A (en) | A kind of hot press-formed process certification method of aluminum alloy plate materials | |
| Kroma et al. | Modern Reverse Engineering Methods Used to Modification of Jewelry | |
| CN106826393B (en) | A kind of integral panel milling deformation control method | |
| US20190168292A1 (en) | Method for positioning a core in a mould | |
| CN104535103A (en) | Automatic test point generating method | |
| CN102861850B (en) | Reverse design method based on large torsion angle rotor blade die forging production | |
| CN112763288A (en) | Rock mass model manufacturing method based on 3D printing and combined with any cracks | |
| Matache et al. | A comparison between 3D scanning and CMM dimensional inspection of small size gas turbine | |
| CN109781043A (en) | Heat exchange fin key parameter calculation method and analytical calculation platform | |
| CN110021027A (en) | A kind of trimming point calculating method based on binocular vision | |
| CN105787146B (en) | A kind of car windshield inspection modular surface model reverse modeling method | |
| CN117405054B (en) | On-line detection method and system for precision of die carrier precision based on three-coordinate measurement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |