CN113295293B - Method for designing position of inner pouring gate of pouring system by detecting dynamic change of molten iron - Google Patents
Method for designing position of inner pouring gate of pouring system by detecting dynamic change of molten iron Download PDFInfo
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- CN113295293B CN113295293B CN202110387189.4A CN202110387189A CN113295293B CN 113295293 B CN113295293 B CN 113295293B CN 202110387189 A CN202110387189 A CN 202110387189A CN 113295293 B CN113295293 B CN 113295293B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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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
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/022—Means for indicating or recording specially adapted for thermometers for recording
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Abstract
The invention aims to provide a method for designing the position of an inner pouring gate of a pouring system by detecting the dynamic change of molten iron, which comprises the steps of presetting a front-end inner pouring gate and a tail-end inner pouring gate of the existing pouring system as typical temperature measuring points, monitoring the temperature change by using an armored thermocouple, recording temperature data by using a color-screen paperless recorder, drawing a negative pressure band at the position by using the water inlet time and the temperature change of the temperature measuring points, analyzing the wall attachment effect, the gas wrapping condition and the turbulent flow condition in the filling process by combining the CAE simulation technology of a casting obtained by casting, and adjusting the position distribution of the inner pouring gate to achieve the purpose of reasonably setting the pouring system.
Description
Technical Field
The invention relates to the field of a pouring system, in particular to a method for designing a position of an inner pouring gate of the pouring system by detecting dynamic change of molten iron.
Background
The gating system includes: a sprue cup. Receiving the molten metal poured from the casting ladle, also called outer sprue and straight sprue. Connecting the outer sprue and the transverse sprue, and introducing molten metal into the casting mold from the outside of the casting mold and the transverse sprue. And connecting the sprue, and distributing the metal flow from the sprue. And fourthly, forming an inner sprue. Connecting the horizontal sprue and infusing molten metal into the casting mold cavity. The gating system is a channel that opens into the mold by introducing liquid metal into the mold cavity. Ingate among the gating system needs reasonable design, patent 201710927579.X discloses a method for laying a gating system, draw two-dimensional pictures through CAD software, project the two-dimensional pictures onto a workbench through a projector, cross gate porcelain tube, a mold, ingate porcelain tube and sprue porcelain tube lay accurately, a first air pressure bar drives an ultrasonic sensor to detect the laying of cross gate porcelain tube and ingate porcelain tube, the laying unevenness is avoided to cause leakage, the pouring is influenced, and a second air pressure bar inserts the tied up cross gate porcelain tube into the ingate porcelain tube stably. The patent and the prior art lack a design and distribution method for an inner pouring gate of a pouring system, the distribution design of the inner pouring gate influences the final pouring result, the inner pouring gate is a mechanism for directly infusing metal liquid into a cavity, and the position of the inner pouring gate is required to ensure the pouring reliability under the condition that turbulent flow cannot occur in the pouring process. Due to the presence of EPS foam, a complex physical and chemical reaction exists before full mold casting and mold filling, and the mold filling process has uncertainty. The quality of the finally formed casting is closely related to the mold filling process, so that the research on the flow direction and the dynamic change of molten iron in the full mold casting process is of great significance, and the position of the inner pouring gate can be designed according to the flow direction and the dynamic change of the molten iron. It is necessary to solve this problem.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for designing the position of an ingate of a gating system by detecting the dynamic change of molten iron, which analyzes the flow direction and the dynamic state of the molten iron by monitoring the temperature of the molten iron at the preset ingate, and reasonably sets the ingate of the gating system, thereby solving the problems occurring in the background art.
The invention aims to provide a method for designing the position of an inner pouring gate of a gating system by detecting the dynamic change of molten iron, which comprises the following steps:
presetting an inner pouring gate in a pouring system as a typical temperature measuring point, monitoring the temperature of the typical temperature measuring point in the pouring process of the pouring system, drawing a temperature change curve, analyzing whether the curve fluctuates, and if the fluctuation exists, determining that molten iron turbulence exists;
carrying out numerical simulation analysis on the negative pressure zone of the cast obtained by pouring by using CAE software, comparing the analysis result with a temperature curve, and if the part of the negative pressure zone appearing in the analysis result is consistent with the part of temperature change curve fluctuation, further confirming the molten iron turbulence of the typical temperature measuring point part of the pouring system;
removing a preset inner pouring gate with molten iron turbulence, and arranging the inner pouring gate at a stable part of the molten iron; and finally, repeating the steps until the condition that the inner pouring gate does not have the turbulent flow is detected and analyzed, and finishing the design of the position of the inner pouring gate.
The further improvement lies in that: the CAE software performs numerical simulations as follows:
(1) the CAE software firstly carries out coupling-based solidification calculation on the casting, then selects pressure distribution in a numerical value picture of a CAE software post-processing menu, and selects pressure limit and negative pressure;
(2) synthesizing a pressure distribution animation by using CAE software, and observing the animation;
(3) if an excessive negative pressure zone appears at a certain part, namely a red alarm area, the filling type turbulence is serious;
removing the preset inner gate, and arranging the inner gate on the stable part of the molten iron; and finally, repeating the steps until the situation that the inner sprue is not turbulent is detected and analyzed, and finishing the design of the position of the inner sprue.
The further improvement lies in that: the temperature measurement of a typical temperature measurement point adopts: mounting an armored thermocouple on a typical temperature measuring point, wherein the armored thermocouple is connected with a temperature measuring line which is connected with a color screen paperless recorder;
and (3) conveying the sand box after molding and sand burying to a pouring system area, then pouring molten iron, monitoring temperature change data of a typical temperature measuring point in the pouring process by an armored thermocouple in the pouring process, and recording the temperature change data by a color screen paperless recorder and drawing a temperature change curve.
The further improvement lies in that: and the male plug of the temperature measuring line is marked by a marking mechanism.
The further improvement lies in that: the marking mechanism is a cloth base adhesive tape, and the specific position of the temperature measuring point is written on the cloth base adhesive tape.
The further improvement is that: molten iron at the negative pressure zone of the CAE software for numerical simulation analysis is unstable, and the defects of entrainment and inclusion are easy to occur.
The further improvement is that: the armored thermocouple is a WRN-191K type armored thermocouple.
The further improvement lies in that: the preset inner gates in the gating system are the inner gates at the front end and the tail end of the gating system.
The invention has the beneficial effects that: according to the invention, the front-end inner gate and the tail-end inner gate are preset as typical temperature measuring points, an armored thermocouple is used for monitoring temperature change, a color-screen paperless recorder is used for recording temperature data, a negative pressure zone of the position is drawn through water inlet time and temperature change of the temperature measuring points, and CAE simulation technology is combined for casting to obtain a casting, wall attachment effect, gas wrapping and turbulence conditions existing in the filling process are analyzed, the position distribution of the inner gates is adjusted, the purpose of reasonably setting a pouring system is achieved, the inner gates can be effectively and reasonably distributed by the whole design method, and the pouring quality is ensured.
According to the invention, the temperature change in the pouring process of the preset inner pouring gate is detected, the temperature is analyzed, and the casting obtained by casting is analyzed by CAE simulation technology and further confirmed, so that the condition of the inner pouring gate in the actual pouring process can be well reflected.
The method analyzes whether the position distribution of the inner pouring gate is reasonable or not by changing the temperature of molten iron in the pouring process of the preset inner pouring gate;
if the position distribution of the inner pouring gate is unreasonable, molten iron at the inner pouring gate can have turbulence, temperature changes can fluctuate, and the turbulence condition at the inner pouring gate is further confirmed by performing CAE simulation technology on a cast obtained by casting, so that the casting effect is influenced in the casting process;
the temperature change of the pouring process of the inner pouring gate is not fluctuated, the turbulence condition at the position of the inner pouring gate is further confirmed by CAE simulation technology of casting obtained by casting, no negative pressure zone exists, the position of the inner pouring gate is reasonably distributed, smooth pouring is guaranteed, and the pouring quality is guaranteed.
The pouring gate position in the pouring system is reasonably set by researching the flow direction and the dynamic state of the molten iron, so that the molten iron can stably, balancedly and quickly fill a casting mold in the mold filling process to replace the model, and the quality of the casting is improved.
Drawings
FIG. 1 is a diagram of a gating system according to an embodiment of the present invention.
Fig. 2 is a graph of the temperature change of four typical temperature measurement points (time on the abscissa and temperature on the ordinate) according to an embodiment of the present invention.
Detailed Description
For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the present invention.
The embodiment provides a design method for an inner pouring gate of a pouring system of an automobile panel mould, which is designed by detecting dynamic change of molten iron;
tool for selecting materials
1. EPS foam pattern of an automobile panel mould;
2. WRN-191K type sheathed thermocouple;
3. a cloth-based adhesive tape as a logo;
4. a color screen paperless recorder;
5. CAE simulation software
Second, design method
1. Assembled experimental model
As shown in fig. 1, the positions of 2 ingates beside a sprue of a gating system and 2 ingates at the tail end of the gating system are preset as typical temperature measuring points; connecting a WRN-191K type armored thermocouple to a temperature measuring point; winding a cloth-based adhesive tape on the male plug of the temperature measuring line, and marking each temperature measuring point; (writing the specific position of the temperature measuring point on the cloth-based adhesive tape)
After the molding sand burying is finished, the sand box is conveyed to a pouring area, a color screen paperless recorder is connected with a temperature measuring line before pouring, and temperature change data in the pouring process are recorded.
2. Analysis of Experimental data
The pouring time of the casting is 74S +/-10S, the temperature of a typical temperature measuring point in the pouring process is monitored, a temperature measuring curve is drawn, the data of the typical temperature measuring point along with the temperature change are shown in figure 2, and four curves represent the temperature change curves of four typical temperature measuring points in a distributed mode.
From the curve temperature change, there is a temperature fluctuation at the typical temperature measurement point, and turbulence exists here.
Carrying out numerical simulation analysis on the casting obtained by pouring by using CAE software:
(1) after the casting is subjected to coupling-based solidification calculation, selecting pressure distribution from a numerical value picture of a CAE software post-processing menu, and selecting pressure limit and negative pressure;
(2) synthesizing a pressure distribution animation and observing the animation;
(3) an excessive negative pressure zone, namely a red alarm area, appears at a certain inner sprue part, which indicates that the filling turbulence is more serious;
the temperature change curve is compared with CAE numerical simulation analysis, and the part corresponding to the negative pressure belt in the red part in CAE software is consistent with the part corresponding to the fluctuating temperature change curve, so that the molten iron at the inner pouring gate part is serious in turbulent flow, unstable in mold filling, easy to generate air entrainment and inclusion defects and consistent in temperature measurement experiment data reaction.
3. Conclusion
And removing the inner pouring gate at the turbulent flow part, and distributing the position of the inner pouring gate at the stable part of the molten iron to achieve the aim of reasonably arranging a pouring system.
The front-end inner pouring gate and the tail-end inner pouring gate of the pouring system are preset as typical temperature measuring points, an armored thermocouple is used for monitoring temperature change, a color screen paperless recorder is used for recording temperature data, a negative pressure zone of the position is drawn through water inlet time and temperature change of the temperature measuring points, CAE simulation technology is combined for casting to obtain a casting, wall attaching effect, gas wrapping and turbulence conditions existing in the filling process are analyzed, the position distribution of the inner pouring gates is adjusted, the purpose of reasonably setting the pouring system is achieved, the positions of the inner pouring gates can be effectively and reasonably distributed through the whole design method, and pouring quality is guaranteed. By researching the flow direction and the dynamic state of the molten iron and reasonably arranging the pouring system, the casting mold is stably, balancedly and quickly filled in the molten iron filling process so as to replace the model, and the quality of the casting is improved.
Claims (8)
1. A method for designing the position of an inner pouring gate of a pouring system by detecting the dynamic change of molten iron is characterized in that: comprises the following steps:
presetting an inner pouring gate in a pouring system as a typical temperature measuring point, monitoring the temperature of the typical temperature measuring point in the pouring process of the pouring system, drawing a temperature change curve, analyzing whether the curve fluctuates, and if the fluctuation exists, determining that molten iron turbulence exists;
carrying out numerical simulation analysis on the negative pressure belt of the cast obtained by pouring by using CAE software, comparing the analysis result with a temperature curve, and further confirming partial molten iron turbulence of a typical temperature measuring point of a pouring system if the part of the negative pressure belt appearing in the analysis result is consistent with the part of temperature change curve fluctuation;
removing a preset inner pouring gate with molten iron turbulence, and arranging the inner pouring gate at a stable part of the molten iron; and finally, repeating the steps until the situation that the inner sprue is not turbulent is detected and analyzed, and finishing the design of the position of the inner sprue.
2. The method for designing a gate position in a gating system by detecting dynamic changes of molten iron according to claim 1, wherein the method comprises the following steps: the CAE software performs numerical simulations as follows:
(1) the CAE software firstly carries out coupling-based solidification calculation on the casting, then selects pressure distribution in a numerical value picture of a CAE software post-processing menu, and selects pressure limit and negative pressure;
(2) synthesizing a pressure distribution animation by using CAE software, and observing the animation;
(3) if an excessive negative pressure zone appears at a certain position, namely a red alarm area, the filling type turbulence is relatively serious.
3. The method for designing a gate position in a gating system by detecting dynamic changes of molten iron according to claim 1, wherein the method comprises the following steps: the temperature measurement of a typical temperature measurement point adopts: mounting an armored thermocouple on a typical temperature measuring point, wherein the armored thermocouple is connected with a temperature measuring line which is connected with a color screen paperless recorder;
and (3) conveying the sand box after molding and sand burying to a pouring system area, then pouring molten iron, monitoring temperature change data of a typical temperature measuring point in the pouring process by an armored thermocouple in the pouring process, and recording the temperature change data by a color screen paperless recorder and drawing a temperature change curve.
4. The method for designing the position of the ingate of the gating system by detecting the dynamic change of the molten iron according to claim 3, wherein the method comprises the following steps: and the male plug of the temperature measuring line is marked by a marking mechanism.
5. The method for designing a gate position in a gating system by detecting the dynamic change of molten iron according to claim 4, wherein the method comprises the following steps: the marking mechanism is a cloth base adhesive tape, and the specific position of the temperature measuring point is written on the cloth base adhesive tape.
6. The method for designing a gate position in a gating system by detecting dynamic changes of molten iron according to claim 2, wherein the method comprises the following steps: molten iron at the negative pressure zone of the CAE software for numerical simulation analysis is unstable, and the defects of entrainment and inclusion are easy to occur.
7. The method for designing a gate position in a gating system by detecting the dynamic change of molten iron according to claim 3, wherein the method comprises the following steps: the armored thermocouple is a WRN-191K type armored thermocouple.
8. The method for designing a gate position in a gating system by detecting dynamic changes of molten iron according to claim 1, wherein the method comprises the following steps: the preset inner gates in the gating system are the inner gates at the front end and the tail end of the gating system.
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