CN112692256A - Method for combining local extrusion under low pressure casting - Google Patents
Method for combining local extrusion under low pressure casting Download PDFInfo
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- CN112692256A CN112692256A CN202110076904.2A CN202110076904A CN112692256A CN 112692256 A CN112692256 A CN 112692256A CN 202110076904 A CN202110076904 A CN 202110076904A CN 112692256 A CN112692256 A CN 112692256A
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- casting
- extrusion
- low pressure
- local
- steering knuckle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
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- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The present application relates to a method of combining localized extrusion under low pressure casting; the method comprises the following steps: s1, digital-analog drawing of the steering knuckle is realized by using CAD; s2, inputting the CAD digital model into the model flow software, and analyzing the positions of the thick wall and the hot spot at the far end and the local part of the steering knuckle and the soup breaking time point at the positions by using the model flow software; s3, designing a small boss above the position of the thick wall and the hot spot of the casting analyzed by the die flow software, and arranging an extrusion pin on the die; s4, analyzing local extrusion defects through die flow software, and improving the die design until no defects exist in the analysis; s5, according to the analysis result of the mold flow software, carrying out low-pressure casting on the steering knuckle, and pressurizing a boss above the position of the casting hot knuckle by using an extrusion pin so that the top of the casting in the cavity is solidified under the action of pressure; the invention improves the physical property of the steering knuckle, eliminates or reduces the defects of shrinkage holes, pinholes and the like, has more compact internal microstructure, reduces the energy consumption and reduces the manufacturing cost.
Description
Technical Field
The present application belongs to the field of casting technology, in particular, it relates to a method for combining local extrusion under the condition of low-pressure casting.
Background
The steering knuckle is also called as a cleat, is one of important parts in an automobile steering axle, and can enable an automobile to stably run and sensitively transmit the running direction. The steering knuckle is used for transmitting and bearing the front load of the automobile, supporting and driving the front wheel to rotate around the main pin so as to steer the automobile. In the driving state of the automobile, the automobile bears variable impact load, so that the automobile is required to have high strength, and a steering knuckle is a hinge for steering the wheel and is generally fork-shaped. The upper fork and the lower fork are provided with two coaxial holes for mounting the main pin, and the steering knuckle journal is used for mounting a wheel. Two ears of a pin hole on the steering knuckle are connected with the fist-shaped parts at two ends of the front shaft through the main pin, so that the front wheel can deflect a certain angle around the main pin to steer the automobile. In order to reduce the abrasion, a bronze bushing is pressed into a pin hole of the steering knuckle, and the lubrication of the bushing is lubricated by injecting lubricating grease by a lubricating nipple arranged on the steering knuckle. In order to make the steering flexible, a bearing is arranged between the lower ear of the steering knuckle and the fist-shaped part of the front axle. The steering knuckle has the advantages that the steering knuckle is light in weight and high in strength, the aim of lightening the automobile can be effectively achieved, the casting process is a development and mass production mode of the common steering knuckle, and the quality of the steering knuckle can be effectively improved by adopting a local extrusion mode in the casting process.
Aiming at the low-pressure casting process, in the steering knuckle casting process, a method for properly extruding the volume and the extruding time is established by adding a local extruding mechanism and simulating through die flow software, so that the local extruding method combined with the low-pressure casting improves the casting quality on the basis of high material yield, and has a great guiding significance and economic value for actual casting production.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: to address the deficiencies of the prior art, a method of combining localized extrusion under low pressure casting is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method of combining localized extrusion under low pressure casting comprising the steps of:
s1, drawing a steering knuckle and a mould digital model by utilizing CAD, designing the steering knuckle and the mould, and marking parameters on the digital model when the steering knuckle and the mould are drawn by using CAD software;
s2, inputting the CAD digital model into the model flow software, and analyzing the positions of the thick wall and the hot spot at the far end and the local part of the steering knuckle and the soup breaking time point at the positions by using the model flow software;
s3, designing a small boss above the far end/local thick wall and hot spot generating position of the casting analyzed by the die flow software, and arranging an extrusion pin on the die;
s4, analyzing local extrusion defects through die flow software, and improving the die design until no defects exist in the analysis;
and S5, according to the analysis result of the mold flow software, carrying out low-pressure casting on the steering knuckle, and pressurizing the boss at the far end/local thick wall of the casting and above the position of the thermal knuckle by using the extrusion pin so that the casting in the cavity is solidified under the action of pressure.
Preferably, in the method of the present invention, in combination with the local extrusion under low pressure casting, the CAD digital-analog drawing step in S1 is as follows:
s11, drawing a basic setting of the isometric graph, wherein the grid capture of the grid is required to be fully utilized for directly drawing the two-dimensional isometric graph;
s12, drawing a reference line of the isometric graph, connecting the reference lines and drawing the isometric graph;
s13, and then marking the isometric graph drawn in S12 with numerical values.
Preferably, in the method of the present invention, in combination with local extrusion under low-pressure casting, Procast and Wincast are used as the die flow software in S2, and Procast and Wincast can verify and optimize aluminum alloy parts, casting molds and casting processes, and show how factors such as material, thick wall, thermal junction position and geometric shape change affect castability through simulation setting and result clarification, so as to achieve the purpose of preventing and improving defects.
Preferably, in the method of the invention combined with local extrusion under low-pressure casting, the hot spot position in S2 refers to a node or local area where the molten aluminum solidifies more slowly than the surrounding metal in the casting during solidification, namely, where the molten aluminum finally cools and solidifies.
Preferably, in the method of the present invention, in combination with the local extrusion under low pressure casting, the small boss in S3 is set at a position directly above the position where the casting distal end/local thick wall and the thermal node occur by the mold flow software at the time of setting.
Preferably, in the method of the present invention, in combination with the local extrusion under low pressure casting, the extrusion pin in S3 is aligned with the top plane position of the small boss, and the small boss and the casting are designed as the internal structure of the mold to prevent the small boss from shifting during extrusion.
Preferably, in the method of the present invention in combination with the localized extrusion under low pressure casting, the improved mold design in S4 is performed when the mold flow analysis detects that the casting is defective, and then the mold flow analysis is repeated S2, and then the defect judgment is performed on the casting until the casting is defect-free.
Preferably, the method of the invention combines local extrusion under low pressure casting, i.e. casting mold is generally arranged above a sealed crucible, compressed air is introduced into the crucible to cause low pressure on the surface of the molten metal, and the low pressure is in the range of 4.5-6 kg/cm 2.
Preferably, the method of the invention is combined with local extrusion under low pressure casting, i.e. casting with the mold above a sealed crucible, the molten metal rises through a riser tube to fill the mold, and controlled solidification behavior can be achieved.
Preferably, in the method for combining local extrusion under low-pressure casting, the pressure range of the extrusion pin in S5 for pressurizing the boss above the casting hot spot position is controlled to be 500-1000 kg/cm 2, and the pressure application time is 0.5-10 seconds.
The invention has the beneficial effects that:
according to the invention, through a low-pressure casting process, in the steering knuckle casting process, by adding a local extrusion mechanism and simulating through mold flow software, the local extrusion method combined with low-pressure casting improves the casting quality on the basis of high material yield, has a considerable guiding significance and economic value for actual casting production, improves the physical property of the steering knuckle, eliminates or reduces the defects of shrinkage cavities, pinholes and the like, and has a more compact internal microstructure. Reduce energy consumption and manufacturing cost.
Drawings
The technical solution of the present application is further explained below with reference to the drawings and the embodiments.
FIG. 1 is a schematic flow chart of steps in an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the scope of the present application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Examples
The present embodiment provides a method for combining partial extrusion under low pressure casting, as shown in fig. 1, including:
a method of combining localized extrusion under low pressure casting comprising the steps of:
s1, drawing a steering knuckle and a mould digital model by utilizing CAD, designing the steering knuckle and the mould, and marking parameters on the digital model when the steering knuckle and the mould are drawn by using CAD software;
s2, inputting the CAD digital model into the model flow software, and analyzing the positions of the thick wall and the hot spot at the far end and the local part of the steering knuckle and the soup breaking time point at the positions by using the model flow software;
s3, designing a small boss above the far end/local thick wall and hot spot generating position of the casting analyzed by the die flow software, and arranging an extrusion pin on the die;
s4, analyzing local extrusion defects through die flow software, and improving the die design until no defects exist in the analysis;
and S5, according to the analysis result of the mold flow software, carrying out low-pressure casting on the steering knuckle, and pressurizing the boss at the far end/local thick wall of the casting and above the position of the thermal knuckle by using the extrusion pin so that the casting in the cavity is solidified under the action of pressure.
In order to implement digital-analog construction of the knuckle and complete the design of the knuckle, the CAD digital-analog drawing step in S1 is as follows:
s11, drawing a basic setting of the isometric graph, wherein the grid capture of the grid is required to be fully utilized for directly drawing the two-dimensional isometric graph;
s12, drawing a reference line of the isometric graph, connecting the reference lines and drawing the isometric graph;
s13, and then marking the isometric graph drawn in S12 with numerical values.
Detect the knuckle in order to realize to the realization carries out thick wall, thermal knuckle position and disconnected hot water time to the knuckle and detects, what the mould flow software in S2 adopted is Procast and Wincast, Procast and Wincast can realize verifying and optimizing aluminum alloy spare part, casting mould and casting flow, set up through the emulation and the result demonstrates how factor such as show material, thick wall, thermal knuckle position and geometry change influences the castability and then reaches the purpose of prevention, improvement defect.
In order to predict the hot spot position, the hot spot position in S2 refers to a node or a local area where the molten aluminum solidifies more slowly than the surrounding metal in the casting during solidification, i.e., where the molten aluminum finally cools and solidifies.
In order to realize the extrusion point setting of the thick wall and the hot spot, the small boss in the step S3 is arranged at the position right above the far end/local thick wall and hot spot of the casting through the die flow software.
In order to realize the pressurization operation of the small-sized bump and complete the solidification of the node, the extrusion pin in S3 is aligned with the top plane position of the small-sized bump when being arranged, and the small-sized bump and the casting are designed as the inner structure of the mold, so as to prevent the small-sized bump from shifting when being extruded.
In order to achieve sufficient improvement of the mold so that the mold can be designed more perfectly, the improvement of the mold design in S4 is performed when the mold flow analysis detects that the casting is defective, and then the mold flow analysis is repeated S2, and then the defect judgment is performed on the casting until the casting is defect-free.
In order to realize the low-pressure casting of the steering knuckle, the casting of the steering knuckle is completed, and the low-pressure casting refers to that a casting mold is generally arranged above a sealed crucible, compressed air is introduced into the crucible, and low pressure is generated on the surface of molten metal and ranges from 4.5 kg/cm to 6kg/cm < 2 >.
In order to realize casting under a low-pressure environment, the low-pressure casting refers to that a casting mold is arranged above a sealed crucible, molten metal rises through a riser tube to fill the casting mold, and the solidification behavior can be controlled.
In order to realize pressurization on the nodes in the casting and accelerate the solidification time, the pressure range of the extrusion pin in the S5 for pressurizing the boss above the hot spot position of the casting is controlled to be 500-1000 kg/cm 2, and the pressure application time is 0.5-10 seconds.
The process comprises the following steps:
firstly, drawing a steering knuckle and a mould digital model by utilizing CAD (computer-aided design), designing the steering knuckle and the mould, and marking parameters on the digital model when the steering knuckle and the mould are drawn by using CAD software;
secondly, inputting the CAD digital model into a model flow software, and analyzing the positions of the thick wall and the hot spot at the far end and the local part of the steering knuckle and the soup breaking time point at the position by using the model flow software;
thirdly, designing a small boss above the far end/local thick wall and hot spot generating positions of the casting analyzed by the die flow software, and arranging an extrusion pin on the die;
fourthly, analyzing the local extrusion defect through the die flow software, and improving the die design until no defect is analyzed;
and fifthly, according to the analysis result of the mold flow software, carrying out low-pressure casting on the steering knuckle, and pressurizing the boss at the far end/local thick wall of the casting and above the position of the thermal knuckle by using an extrusion pin so that the casting in the cavity is solidified under the action of pressure.
In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. Method for combining local extrusion under low-pressure casting, characterized in that it comprises the following steps:
s1, drawing a steering knuckle and a mould digital model by utilizing CAD, designing the steering knuckle and the mould, and marking parameters on the digital model when the steering knuckle and the mould are drawn by using CAD software;
s2, inputting the CAD digital model into the model flow software, and analyzing the positions of the thick wall and the hot spot at the far end and the local part of the steering knuckle and the soup breaking time point at the positions by using the model flow software;
s3, designing a small boss above the far end/local thick wall and hot spot generating position of the casting analyzed by the die flow software, and arranging an extrusion pin on the die;
s4, analyzing local extrusion defects through die flow software, and improving the die design until no defects exist in the analysis;
and S5, according to the analysis result of the mold flow software, carrying out low-pressure casting on the steering knuckle, and pressurizing the boss at the far end/local thick wall of the casting and above the position of the thermal knuckle by using the extrusion pin so that the casting in the cavity is solidified under the action of pressure.
2. The method for combining partial extrusion under low pressure casting according to claim 1, wherein the CAD digital-analog drawing step in S1 is as follows:
s11, drawing a basic setting of the isometric graph, wherein the grid capture of the grid is required to be fully utilized for directly drawing the two-dimensional isometric graph;
s12, drawing a reference line of the isometric graph, connecting the reference lines and drawing the isometric graph;
s13, and then marking the isometric graph drawn in S12 with numerical values.
3. The method for combining local extrusion under low pressure casting according to claim 1, wherein the mold flow software in S2 adopts Procast and Wincast, and Procast and Wincast can verify and optimize the aluminum alloy parts, casting molds and casting process, and show how the casting performance is affected by the factors such as material, thick wall, thermal junction position and geometric shape change through simulation setting and result clarification, so as to achieve the purpose of preventing and improving defects.
4. The method in combination with the local extrusion under low pressure casting according to claim 1, wherein the hot spot position in S2 is a node or a local area where the molten aluminum solidifies more slowly than the surrounding metal in the casting during solidification, i.e., where it finally cools and solidifies.
5. The method of incorporating localized squeezing under low pressure casting as claimed in claim 1, wherein said mini-boss in S3 is set by die flow software at a position directly above the casting distal/localized thick wall and heat node generation position at the time of setting.
6. The method for combining partial extrusion under low pressure casting according to claim 1, wherein the extrusion pin of S3 is aligned with the top plane of the small boss, and the small boss and the casting are designed as the inner structure of the mold to prevent the small boss from shifting during extrusion.
7. The method in combination with localized extrusion under low pressure casting of claim 1, wherein the improvement of the mold design in S4 is performed when the mold flow analysis detects defects in the casting, and then the mold flow analysis is repeated S2 and the casting is subjected to defect judgment until the casting is defect-free.
8. The method of claim 1 in combination with localized extrusion under low pressure casting, wherein the low pressure casting is performed with the mold generally placed above a sealed crucible into which compressed air is introduced to create a low pressure on the surface of the molten metal, wherein the low pressure is in the range of 4.5 to 6kg/cm 2.
9. The method of combining localized extrusion under low pressure casting as claimed in claim 8, wherein said low pressure casting is performed with the mold placed above the sealed crucible, and the molten metal rises through the riser tube to fill the mold, and control of solidification behavior is achieved.
10. The method for local extrusion in low-pressure casting according to claim 1, wherein the pressure range for pressurizing the boss above the casting hot spot position by the extrusion pin in S5 is controlled to be 500-1000 kg/cm 2, and the pressure is applied for 0.5-10 seconds.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110076904.2A CN112692256A (en) | 2021-01-20 | 2021-01-20 | Method for combining local extrusion under low pressure casting |
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| CN202110076904.2A CN112692256A (en) | 2021-01-20 | 2021-01-20 | Method for combining local extrusion under low pressure casting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114700477A (en) * | 2022-02-25 | 2022-07-05 | 东风汽车集团股份有限公司 | High-pressure casting local extrusion control method, device, equipment and medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114700477A (en) * | 2022-02-25 | 2022-07-05 | 东风汽车集团股份有限公司 | High-pressure casting local extrusion control method, device, equipment and medium |
| CN114700477B (en) * | 2022-02-25 | 2023-07-25 | 东风汽车集团股份有限公司 | High-pressure casting local extrusion control method, device, equipment and medium |
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Application publication date: 20210423 |