CN111889652B - A locking device for local pressure application in counter-gravity casting and counter-gravity casting equipment - Google Patents
A locking device for local pressure application in counter-gravity casting and counter-gravity casting equipment Download PDFInfo
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- CN111889652B CN111889652B CN202010842925.6A CN202010842925A CN111889652B CN 111889652 B CN111889652 B CN 111889652B CN 202010842925 A CN202010842925 A CN 202010842925A CN 111889652 B CN111889652 B CN 111889652B
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
本发明公开了一种反重力铸造局部加压用锁模装置及反重力铸造设备，包括侧模锁紧部和上模锁紧部，所述侧模锁紧部通过连接部件固定于反重力铸造设备的侧模模板或机架上，包括锁紧驱动机构、锁紧力传动机构和侧模锁紧块，所述锁紧力驱动机构锁紧力驱动机构上设有锁紧力传动机构，锁紧力传动机构连接侧模锁紧块，所述侧模锁紧块上带有斜面，上模锁紧部上设有与侧模锁紧块形状相适应的斜面。本发明在应用于带有局部加压装置的多升液管反重力车轮铸造成型装置时，在局部加压时可以提供稳定的锁模力，显著提高了安全性。
The present invention discloses a locking device for local pressurization of anti-gravity casting and an anti-gravity casting device, comprising a side mold locking part and an upper mold locking part, wherein the side mold locking part is fixed to the side mold template or frame of the anti-gravity casting device through a connecting component, and comprises a locking drive mechanism, a locking force transmission mechanism and a side mold locking block, wherein the locking force drive mechanism is provided with a locking force transmission mechanism, and the locking force transmission mechanism is connected to the side mold locking block, wherein the side mold locking block has an inclined surface, and the upper mold locking part is provided with an inclined surface adapted to the shape of the side mold locking block. When the present invention is applied to a multi-liter liquid pipe anti-gravity wheel casting molding device with a local pressurization device, a stable locking force can be provided during local pressurization, thereby significantly improving safety.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a mold locking device for local pressurization in antigravity casting and antigravity casting equipment.
Background
The light weight is one of the most important ways of energy conservation and emission reduction of the fuel oil automobile and consumption reduction and range increase of the new energy automobile, and the light weight materials such as aluminum alloy and the like replace the traditional steel materials, so that the light weight material becomes the necessary choice for updating the automobile design. The aluminum alloy used on the automobile can be divided into cast aluminum alloy and deformed aluminum alloy, and the cast aluminum alloy is mainly used for manufacturing parts such as an engine, a clutch housing, wheels, a chassis and the like. With the demand for improving the quality of castings and the development of casting technology, more parts are produced by adopting low-pressure casting, differential pressure casting and pressure regulating casting, and the method belongs to the antigravity casting method. The basic principle of casting is that low-pressure gas is used to drive the metal melt in a crucible or a heat preservation furnace to rise through a liquid lifting pipe and enter a die cavity, and solidification and feeding of the metal melt in the casting die under the action of pressure are completed after the die is filled.
Conventional aluminum alloy low pressure, differential pressure and pressure regulating wheel casting techniques typically employ single gate, single lift tube mold filling techniques. Taking an aluminum alloy wheel as an example, a liquid lifting pipe is arranged at the central position of the wheel, namely the wheel center position of the wheel, so that a metal melt enters a cavity and completes filling and solidification. In order to refine the structure and eliminate casting defects such as shrinkage cavities and shrinkage porosity, the cooling of the wheel mold is generally enhanced by adopting water cooling, water mist cooling and the like in the prior art, however, the enhanced cooling greatly shortens the solidification time of the wheel, for example, the solidification time of the large-size wheel after enhanced cooling can be shortened to be within 100s, but the problem that the temperature field of the wheel cooling and solidification process is difficult to control in the production process is caused, the sequential solidification is difficult to realize, the product performance is unstable, and the qualification rate is low.
Other types of filling of wheels have been attempted in the prior art. Patent CN201010107026.8 discloses a low-pressure casting double-side casting process and device for aluminum alloy wheels, wherein pouring gates are arranged on two sides of the wheels, so that aluminum liquid enters from the rim, the aluminum liquid is crystallized from the wheel center to the rim under the temperature of a chilled mold by cooling control, the flowing distance of the aluminum liquid is shortened, and shrinkage porosity defects of an R angle or the rim position are reduced by matching with cooling. The documents CN201310557627.2, CN201410825962.0, etc. disclose a method of combining a center gate and two side gates, which is expected to reduce the weight of the hub and to improve the mechanical strength. CN201610390494.8 adopts a double-die hub die, and the pouring gate is also arranged on the rim position, so that two hubs can be poured at one time.
However, the device and the method have obvious defects, and for the mode that the aluminum liquid only enters from the rim, the inlet is arranged in the middle of the rim, and the split flow can be caused after the aluminum liquid enters, namely, the mold is simultaneously filled at the wheel center and the rim, so that the mold filling time at each position is uncontrollable, the solidification sequence is uncontrollable, and shrinkage cavity shrinkage porosity defects are easily formed. In the case of the combination of the center gate and the both side gates, the molten aluminum enters from both inlets, and a confluence is formed in the intermediate position, which is likely to cause cold shut or the like due to uneven gas discharge.
The application designs a rapid sequential solidification wheel forming device and method based on a multi-lift tube, wherein a gate of a mould is arranged right below a rim of a wheel or outside an upper R angle of a lower rim. The method can obviously reduce the filling distance and solve the problem of long-distance feeding of large-size wheels, and meanwhile, the shrinkage cavity at the center wheel center is eliminated by adopting a local mechanical pressurizing mode, but the pressure of the local mechanical pressurizing is very large and far exceeds the pressure maintaining pressure of low pressure or differential pressure casting, so that the problem of how to realize effective mold locking to ensure the local pressurizing effect is urgent to be solved when the local mechanical pressurizing is carried out.
Disclosure of Invention
In order to solve the technical problems, the invention provides a mold locking device for local pressurization of antigravity casting and antigravity casting equipment.
The complete technical scheme of the invention comprises the following steps:
The utility model provides a mode locking device is used in antigravity casting, mode locking device is used in antigravity casting includes side form locking part, goes up mould locking part and lower mould locking part, on side form locking part is fixed in the side form template or the frame of antigravity casting equipment through adapting unit, including locking actuating mechanism, locking force drive mechanism and side form locking piece, be equipped with locking force drive mechanism on the locking force actuating mechanism, locking force drive mechanism connects the side form locking piece, have the inclined plane on the side form locking piece, go up and be equipped with the inclined plane that suits with side form locking piece shape on mould locking part and the lower mould locking part.
The locking driving mechanism can drive the side die locking part to move left and right.
In the mode locking state, the inclined plane of the side die locking block is matched and attached with the inclined planes of the upper die locking part and the lower die locking part, and simultaneously, the side die driving mechanism applies a die locking force to the attaching surface.
In the mode locking state, the inclined plane of the side die locking block is positioned above the inclined planes of the upper die locking part and the lower die locking part.
The locking driving mechanism is a hydraulic cylinder, and the locking force transmission mechanism is a hydraulic rod.
Countergravity casting equipment with the device.
The antigravity casting equipment is low-pressure casting equipment or differential pressure casting equipment.
The antigravity casting equipment further comprises a local pressurizing and refining device, wherein the local pressurizing and refining device comprises a local pressurizing mechanism and a refining mechanism;
The local pressurizing mechanism is arranged below the position corresponding to the wheel center of the wheel on the anti-gravity casting wheel mold, and comprises a pressure driving mechanism, a pressure transmission mechanism and a pressure applying mechanism, wherein the pressure applying mechanism is contacted with the metal melt and applies pressure to the metal melt after filling is finished;
The thinning mechanism is arranged on the anti-gravity casting wheel mold, corresponds to the upper part of the wheel center of the wheel and refines the molten metal in the solidification process.
The pressure driving mechanism is a hydraulic cylinder, the pressure transmission mechanism is a hydraulic rod, and the pressure applying mechanism is a pressure block.
The thinning mechanism is an ultrasonic thinning mechanism or a vibration thinning mechanism.
The anti-gravity casting equipment comprises a die, wherein a pouring gate on the die is arranged on a circular ring surface right below a wheel rim.
The invention has the advantages compared with the prior art that:
The application provides a rapid sequential solidification wheel forming device and method based on a multi-lift tube, wherein a gate of a mould is arranged right below a rim of a wheel. Through the liquid lifting and filling of the liquid lifting pipes, the filling distance of the metal melt is shortened by more than half compared with the existing single liquid lifting pipe mode, the temperature of the metal mold can be reduced to below 320 ℃ from the existing 420 ℃, the cooling speed and the cooling effect of the wheel are naturally accelerated, and rapid sequential solidification is realized. And further improved, a local pressurizing device is added at the center of the wheel, and the pressure applying mechanism is in contact with the metal melt and applies pressure to the metal melt after the end of filling. The aluminum liquid is solidified under extremely high pressure, so that the possibility of forming shrinkage cavity and shrinkage porosity defects is eliminated. However, because the pressure of local mechanical pressurization is very large and far exceeds the pressure maintaining pressure of low-pressure or differential pressure casting, potential safety hazards are brought, based on the device, the inventor designs a mold locking device for the local pressurization of antigravity casting, and when the local pressurization is applied, a hydraulic cylinder applies mold locking force to the joint inclined plane of a side mold locking block and an upper mold locking part, so that a metal melt can still keep a good mold locking state under the condition of extremely high pressure. When the device is applied to the multi-riser anti-gravity wheel casting molding device with the local pressurizing device, stable mold locking force can be provided during local pressurizing, and the safety is obviously improved.
Drawings
FIG. 1 is a schematic illustration of a wheel antigravity casting apparatus incorporating the mold locking device of the present invention in an unlocked condition.
Fig. 2 is a schematic view showing the structure of the wheel antigravity casting apparatus with the mold locking device of the present invention in a locked state.
Fig. 3 is a schematic view of a prior art wheel structure.
Fig. 4a shows a portion of the apparatus of fig. 1 where gas pockets are likely to occur during filling.
Fig. 4b is an enlarged view of a portion of fig. 4 a.
Fig. 4c is a schematic diagram of the filling sequence of fig. 4a during slow filling.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
As shown in fig. 1, the mold locking device of the present invention comprises a side mold locking part, an upper mold locking part and a lower mold locking part, wherein the side mold locking part is fixed on a side mold plate or a frame of the antigravity casting equipment through a connecting component, and comprises a first side mold locking part and a second side mold locking part, each side mold locking part comprises a locking driving mechanism 11, a locking force transmission mechanism 12 and a side mold locking block 13, the locking force driving mechanism 11 can be any common driving mechanism in the prior art such as a hydraulic cylinder, a motor and the like, a hydraulic cylinder is preferably adopted here, the hydraulic cylinder is provided with the locking force transmission mechanism, a hydraulic rod is preferably used here, the upper front end of the hydraulic rod is connected with the side mold locking block 13, each side mold locking block is similar to a half trapezoid in shape, the front end is provided with a front protruding inclined plane 14, and the inclined plane 14 is used for respectively pressing a corresponding upper mold locking part inclined plane 16 on the upper mold locking part 15 and a corresponding lower mold locking part inclined plane on the lower mold locking part.
The lock driving mechanism 11 can drive the side mold locking portion to move left and right to perform mold opening and mold locking operations.
In the mode locking state, the inclined plane of the side die locking block is matched and attached with the inclined planes of the upper die locking part and the lower die locking part, and meanwhile, the side die driving mechanism applies certain mode locking force to the attaching surface. In the mode locking state, the inclined planes of the side die locking blocks are positioned above the inclined planes of the upper die locking part and the lower die locking part.
When the upper die, the lower die and the side die are locked, as shown in fig. 1, the locking force driving mechanism 11 drives the side die locking part to move outwards to leave a die locking space, the upper die plate descends and is locked, then the locking force driving mechanism 11 drives the side die locking part to move inwards to enable the corresponding two inclined planes to be matched and attached, the inclined planes of the side die locking blocks are located above the inclined planes of the upper die locking part and the lower die locking part, and the side die locking part enters a die locking state, as shown in fig. 2. The casting process is then performed. And unlocking the lock according to the reverse operation of the locking mode after the completion.
After the aluminum mould is locked, when the local pressurizing device locally pressurizes the aluminum liquid after mould filling, the pressure is transmitted to the upper mould through the aluminum liquid, and at the moment, the side mould driving mechanism applies certain mould locking force to the joint surface of the upper mould locking part and the side mould locking part. The locking state of the die under extremely high pressure can be ensured, and the safety is obviously improved.
The wheel forming device used in cooperation with the present invention, and the cooperation process will be described below.
Fig. 3 is a typical wheel construction wherein the central location of the wheel is generally referred to in the prior art as the center of the wheel, the portion of the wheel that engages the tire on the outboard side of the wheel, the portion that supports the tire is referred to as the rim, the mounting connection is made to the axle center, and the portion of the wheel that supports the rim is referred to as the spokes, with windows left in between. The portion of the rim that retains and supports the tire direction is called the rim.
In the existing production of low-pressure or differential pressure casting aluminum alloy wheels, a liquid lifting pipe is arranged at the center wheel center of the wheel almost entirely, melt enters a cavity through a vacuum cup and a sprue bush which are connected to the liquid lifting pipe, and is split under the action of a split cone, and is sequentially filled along the sequence of the wheel center, a spoke, a rim and a rim, and solidification is realized after the cavity is filled. Meanwhile, the area of the pouring gate is large, so that the mold filling speed is high. However, some problems caused by the pouring and filling mode cannot be well solved all the time, such as long gate distance and overlong filling distance, the hot joint parts such as the connection of the rim and the spoke are very difficult to feed, shrinkage cavities and shrinkage porosity are easy to form, and the problem of production puzzled in the wheel industry is a great problem. Although the sequential solidification is expected by adopting water cooling, water mist cooling and the like to the position, the temperature field is difficult to accurately control due to the short wheel filling and solidification time, and a considerable proportion of waste products are inevitably generated.
In the prior art, a mode of bilateral pouring is adopted at the middle position of the side face of the rim, and the shrinkage cavity shrinkage porosity defect is easily formed due to uncontrollable filling and solidification sequence caused by full-filling flow distribution.
Based on the problem, the invention provides a wheel forming device based on a multi-liter liquid channel, which is shown in fig. 1, and comprises a holding furnace 1 filled with aluminum liquid, wherein a high-pressure air source is connected in the holding furnace, a plurality of liquid lifting pipes 2 are arranged in the holding furnace, and the lower parts of the liquid lifting pipes are immersed in the aluminum liquid 3. When the high-pressure air source is used for pressurizing the molten aluminum in the furnace, the molten aluminum can rise along the plurality of liquid lifting pipes. The upper part of the lift tube is connected with a gate of a mould through a vacuum cup and the special-shaped gate component 4 disclosed by the invention, and enters a cavity 5 of the mould. The special pouring gate pouring assembly comprises a pouring cup and a special pouring gate sleeve positioned above the pouring cup.
The gate of the mold is disposed on a circular surface right under the rim of the wheel, and specifically, the "circular surface right under the rim" in the present invention refers to a circular surface formed around the central axis of the wheel on the side of the rim opposite to the rim. The outer circle forming the circular ring is a circle formed by the outline of the outermost ring of the wheel on the surface, and the inner circle is a circle formed by the outline of the outer side of the window area of the wheel around the central axis of the wheel. As shown in fig. 3. Correspondingly, the position where the sprue bush is communicated with the die is also arranged at the position.
It is particularly preferred that the gate and the gate sleeve be disposed on the torus at positions outside the corresponding window area, or at positions on the torus corresponding to the connection of the rim and the spoke.
In a preferred embodiment, the number of gates may be two, may be symmetrically disposed on both sides of the wheel, or may be a plurality of gates disposed around the wheel axis. The number of the liquid lifting pipes corresponding to the pouring gate can be two, the liquid lifting pipes can be symmetrically arranged at two sides of the wheel, and a plurality of liquid lifting pipes can also be arranged around the axis of the wheel.
The device can obviously reduce the filling distance and solve the problem of long-distance feeding of large-size wheels. The mold filling and solidification time at the center of the wheel is relatively late, and problems of liquid flow convergence may occur, and casting defects such as shrinkage cavity shrinkage porosity and inclusions may occur at the position. The device comprises a local pressurizing mechanism and/or a thinning mechanism, wherein the local pressurizing mechanism is arranged below a mould, the position of the mould corresponding to the wheel center of the wheel is lower than the position of the local pressurizing mechanism, the local pressurizing mechanism comprises a pressure driving mechanism, a pressure transmission mechanism and a pressure applying mechanism, the pressure applying mechanism is in contact with the metal melt and applies pressure to the metal melt after the filling is finished, and the thinning mechanism is arranged above the wheel mould, corresponds to the position of the wheel center of the wheel and refines the metal melt in the solidification process of the metal melt. The pressure driving mechanism is a hydraulic oil cylinder 6, the pressure transmission mechanism is a hydraulic rod 7, and the pressure applying mechanism is a pressure block 8. The specific pressurizing process is to apply a mechanical pressure of 1000 KPa-120 MPa after the filling is finished. The aluminum liquid is solidified under extremely high pressure, so that shrinkage cavity and shrinkage porosity defects are prevented from being formed at the place due to insufficient edge feeding pressure.
The thinning mechanism is an ultrasonic thinning mechanism or a vibration thinning mechanism. In the specific embodiment, the vibration generator 9 and the vibration rod 10 are included, the vibration rod 10 is inserted into the aluminum liquid, and vibrates the aluminum liquid in the solidification process, so that dendrites formed by crystallization of the aluminum liquid are broken, nucleation is enhanced, grains are refined, and the mechanical properties of the wheel are improved.
The invention also discloses a low-pressure/differential-pressure casting process suitable for the mold filling mode, and because the pouring mold filling mode of the invention is greatly changed compared with the prior art, the original mold filling mode and the solidification process cannot be suitable for the invention, and based on the invention, a process suitable for the mold filling position is designed.
The method specifically comprises the following steps:
(1) The locking driving mechanism drives the side die locking part to move outwards to leave a die locking space, then the lower die, the upper die and the side die are locked, and after the lower die, the upper die and the side die are locked, the locking driving mechanism drives the side die locking part to move inwards to enable the two inclined planes to be matched and attached, and the inclined plane of the side die locking block is positioned above the inclined plane of the upper die locking part and enters a die locking state;
(2) The liquid lifting step, namely pressurizing the aluminum liquid in the heat preservation furnace through a high-pressure air source to enable the aluminum liquid to rise to a gate position along a liquid lifting pipe under pressure, wherein the step-up speed is 2.8-4.0 KPa/s at the stage, and the pressure is increased to 20KPa;
(3) Continuously boosting, namely enabling the aluminum liquid to enter a cavity through a gate, wherein the two-stage boosting is carried out in the stage of filling, the boosting speed in the first stage is 0.1-0.2 KPa/s, the time is 2-4 s, and then the second stage is carried out for quickly boosting until the cavity is full, and the pressure reaches 35KPa;
the boost speed P' of this second stage is determined by:
wherein:
P' is the boosting speed, the unit is kPa/s, H is the total height of a cavity, the unit is mm, rho is the metal melt density, the unit is g/cm 3, K is the resistance coefficient, the value range is 1-1.5, t is the preset filling time, the unit is s, preferably 10s, and 102 is the unit conversion coefficient, N is the number of lift tubes, the value range is 2-6, the number can be selected according to the window number of wheels of different models, preferably 2-4, x is the lift index, the value range is 0.2-0.8, and in the scheme of the wheels adopted in the embodiment, the value is 0.5.
(4) And after the mold filling is finished, rapidly increasing the pressure to 150KPa at a step-up speed of 8-10 KPa/and maintaining the pressure for 60-150 s, wherein the solidification of the wheel is finished.
(5) And (3) pressure relief and air release, namely, after the solidification of the aluminum alloy wheels is finished, releasing the gas pressure in the heat preservation furnace, and enabling the aluminum liquid which is not solidified at the riser tube and the pouring gate to flow back into the heat preservation furnace.
(6) And unlocking the die, ejecting the casting, and entering the next production cycle.
For the boost speed selection of the liquid lifting stage and the filling stage, the inner diameter of the liquid lifting pipe is fixed during liquid lifting, and turbulent flow is basically not generated, so that the metal melt can be quickly lifted to reach the gate position by adopting the quick boost speed, and the liquid lifting time is shortened. In the filling stage, the complex shapes of the cavity and the gate are considered, in the traditional filling mode, the sectional areas of the lift tube and the gate are not different greatly due to the fact that the casting mode is adopted from the position of the wheel center, and turbulence is not easy to generate due to the fact that the sectional area of the cavity at the position of the wheel center is large, so that the filling boosting speed can be obtained through experience or experiment. For the filling mode of the invention, the filling is carried out on the annular surface of the rim, the irregular shape-following pouring gate is adopted, the shape area difference between the liquid lifting pipe and the pouring gate is large, meanwhile, the space at the rim is smaller, and turbulent flow and air rolling are easily generated if the filling pressure is unreasonable, so that air hole defects are caused. In the prior art, the design of the filling pressure adopts a calculation mode under an ideal state and is corrected by combining resistance coefficients and the like. The flow state change caused by the change in the sectional areas of the lift tube and the gate is not considered. Therefore, the ideal charging-type boosting speed cannot be obtained by adopting an empirical formula in the prior art.
The present invention has been made in view of the above problems, and combines the shape and cross-sectional area of a lift tube, a gate, a cavity above the gate, and the flow characteristics of a molten metal. It is found that for the wheel rim position, as shown by the arrow in fig. 4a, there are two positions with significantly changed areas in the initial stage of filling, as shown by the arrow in fig. 4b, where the gas is very easy to form in the region if turbulence is generated, and through design and calculation, the invention adopts two-stage pressurization, the first stage obviously reduces the pressure-increasing speed, so that the metal melt can smoothly flow in the initial stage of filling, fills the above-mentioned regions to avoid the gas from rolling, as shown by fig. 4c (where the arrow is the melt filling direction), and then enters the second stage to rapidly increase the pressure to shorten the filling time. In the second stage of the invention, research discovers that the filling stability and the number of the liquid lifting pipes are obviously related, and because the traditional pouring mode from the wheel center position only comprises one liquid lifting pipe and a pouring gate, the filling stability and the number of the liquid lifting pipes can be regularly obtained through experiments and quantitatively processed. In the filling mode of the invention, the number of the liquid lifting pipe and the pouring gate can be 2 or more. Under the same pressure-increasing condition, the flow rate at the gate and the flow rate in the cavity above the gate can be obviously changed, so that the filling flow mode is uncontrollable. Therefore, the second stage of the boosting mode is obtained through research, and as can be seen from the formula (1), the boosting speed which can be adopted by the boosting pipe can be gradually increased along with the increase of the quantity of the liquid lifting pipes in the same preset filling time, and the problems of turbulent air entrainment and the like are avoided. The value of the resistance coefficient is related to the viscosity of molten metal, the complexity of a casting mould cavity and the like, the lower limit is taken when the resistance is small, and the upper limit is taken when the resistance is large.
Example 1:
the 2 lift tubes and gates are adopted, and the mass percentage composition of the used metal melt is ：Si：5～9％,Mg：0.3～0.5％,Zr：0.01～0.02％,B：0.005～0.007％,RE：0.002～0.005％,Nd：0.002～0.005％,Fe:0.05～0.15％,Mn：0.05～0.1％,Ti：0.08～0.14％, as follows, and the rest is Al and unavoidable impurities.
(1) The locking driving mechanism drives the side die locking part to move outwards to leave a die locking space, then the lower die, the upper die and the side die are locked, and after the lower die, the upper die and the side die are locked, the locking driving mechanism drives the side die locking part to move inwards to enable the two inclined planes to be matched and attached, and the inclined plane of the side die locking block is positioned above the inclined plane of the upper die locking part and enters a die locking state;
(2) The liquid lifting step, namely pressurizing the aluminum liquid in the heat preservation furnace through a high-pressure air source to enable the aluminum liquid to rise to a gate position along a liquid lifting pipe under pressure, wherein the pressure rising speed is 3.5KPa/s at the stage, and the pressure is increased to 20KPa;
(3) And (3) filling, namely continuously boosting, namely enabling the aluminum liquid to enter the cavity through the pouring gate, wherein the boosting speed in the first stage is 0.2KPa/s, the time is 1.8s, enabling the molten metal to be smoothly filled in the area indicated by the arrow in FIG. 4b, and then entering the second stage, and then, rapidly filling the cavity at the boosting speed of 0.66KPa/s until the cavity is full.
(4) After the mold filling is finished, the pressure is quickly increased to 150KPa at a boosting speed of 8 KPa/and maintained, the hydraulic cylinder drives the hydraulic rod to drive the pressure block to apply 2000KPa mechanical pressure to the wheel center position, and the vibration generator drives the vibration rod to vibrate and refine the aluminum liquid until the solidification of the wheels is completed. In the pressure maintaining process, the high pressure feeding of the rim hot joint is always kept at the gate, and the possibility of shrinkage cavity shrinkage porosity at the gate is completely eliminated under the feeding of high pressure molten aluminum. Meanwhile, the pressure block locally pressurizes molten metal at the wheel center, so that the possibility of shrinkage cavity and shrinkage porosity at the wheel center is eliminated.
(5) And (3) pressure relief and air release, namely, after the solidification of the aluminum alloy wheels is finished, releasing the gas pressure in the heat preservation furnace, and enabling the aluminum liquid which is not solidified at the riser tube and the pouring gate to flow back into the heat preservation furnace.
(6) And unlocking the die, ejecting the casting, and entering the next production cycle.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (8)
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| CN108237212A (en) * | 2018-03-13 | 2018-07-03 | 中信戴卡股份有限公司 | A kind of aluminum vehicle wheel Extrution casting technique and its device |
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| CN212329617U (en) * | 2020-08-20 | 2021-01-12 | 北京航空航天大学 | A kind of clamping device for partial pressure of anti-gravity casting and anti-gravity casting equipment |
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| CN108237212A (en) * | 2018-03-13 | 2018-07-03 | 中信戴卡股份有限公司 | A kind of aluminum vehicle wheel Extrution casting technique and its device |
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| CN212329617U (en) * | 2020-08-20 | 2021-01-12 | 北京航空航天大学 | A kind of clamping device for partial pressure of anti-gravity casting and anti-gravity casting equipment |
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