CN111889652A - Anti-gravity casting is mould locking device and anti-gravity casting equipment for local pressurization - Google Patents
Anti-gravity casting is mould locking device and anti-gravity casting equipment for local pressurization Download PDFInfo
- Publication number
- CN111889652A CN111889652A CN202010842925.6A CN202010842925A CN111889652A CN 111889652 A CN111889652 A CN 111889652A CN 202010842925 A CN202010842925 A CN 202010842925A CN 111889652 A CN111889652 A CN 111889652A
- Authority
- CN
- China
- Prior art keywords
- locking
- pressure
- mold
- wheel
- mould
- 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.)
- Pending
Links
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a mould locking device for local pressurization in antigravity casting and antigravity casting equipment, which comprise a side mould locking part and an upper mould locking part, wherein the side mould locking part is fixed on a side mould plate or a rack of the antigravity casting equipment through a connecting part and comprises a locking driving mechanism, a locking force transmission mechanism and a side mould locking block, the locking force transmission mechanism of the locking force driving mechanism is provided with the locking force transmission mechanism, the locking force transmission mechanism is connected with the side mould locking block, the side mould locking block is provided with an inclined plane, and the upper mould locking part is provided with an inclined plane adaptive to the shape of the side mould locking block. When the device is applied to the multi-riser tube antigravity wheel casting forming device with the local pressurizing device, stable mold locking force can be provided during local pressurizing, and the safety is obviously improved.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a mould locking device for local pressurization in antigravity casting and antigravity casting equipment.
Background
The light weight is one of the most important ways for saving energy and reducing emission of fuel automobiles and reducing consumption and increasing range of new energy automobiles, and light weight materials such as aluminum alloy and the like are used for replacing traditional steel materials, so that the light weight materials become necessary choices for the updating of automobile design. Aluminum alloys used in automobiles can be classified into cast aluminum alloys and wrought aluminum alloys, and the cast aluminum alloys are mainly used for manufacturing parts such as engines, clutch housings, wheels, chassis parts, 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 all belong to anti-gravity casting methods. The basic principle of the casting is that low-pressure gas is used for driving metal melt in a crucible or a heat preservation furnace to rise through a riser tube and enter a mold cavity, and after mold filling is finished, the metal melt in the mold is solidified and fed under the action of pressure.
The traditional aluminum alloy low-pressure, differential-pressure and pressure-regulating wheel casting technology generally adopts a single-sprue single-riser tube mold filling technology. Taking an aluminum alloy wheel as an example, a riser tube is arranged at the center of the wheel, namely the wheel center of the wheel, so that metal melt enters a cavity and is filled and solidified. In order to refine the structure and eliminate the casting defects of shrinkage cavity, shrinkage porosity and the like, the cooling of a wheel mold is generally enhanced in the prior art by adopting water cooling, water mist cooling and the like, however, the enhanced cooling greatly shortens the solidification time of the wheel, for example, the solidification time of the large-size wheel after the enhanced cooling can be shortened to be within 100s, but the problem that the temperature field in the processes of cooling and solidifying the wheel in the production process is difficult to control is caused, so that the sequential solidification is difficult to realize, the product performance is unstable, and the qualification rate is low.
Other filling approaches have been attempted in the prior art for wheels. Patent CN201010107026.8 discloses a bilateral casting technology and device of aluminum alloy wheel low pressure casting sets up the runner in wheel both sides, makes aluminium liquid get into from rim, makes aluminium liquid crystallize to the rim by the wheel center under the mould temperature of quench through to cooling control, has shortened the distance that aluminium liquid flows, and the shrinkage porosity defect at R angle or rim position has been reduced in the cooperation cooling. Documents CN201310557627.2 and CN201410825962.0 disclose that a center gate and two side gates are combined to reduce the weight of the hub and improve the mechanical strength. CN201610390494.8 adopts a quick-witted bimodulus wheel hub mould, and the runner sets up on the rim position equally, realizes once pouring two wheel hubs.
However, the device and the method also 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 aluminum liquid can be shunted after entering, namely the aluminum liquid is filled to the wheel center and the wheel edge at the same time, so that the filling time at each position is uncontrollable, the solidification sequence is uncontrollable, and the defects of shrinkage cavity and shrinkage porosity are easily formed. And for the mode of combining the central gate and the gates at two sides, because the aluminum liquid enters from the two inlets, confluence can be formed at the middle position, and cold shut and the like are easily caused by reasons such as unsmooth gas discharge and the like.
The applicant designs a rapid sequential solidification wheel forming device and method based on multiple lift pipes, wherein a pouring gate of a mold is arranged right below a rim of a wheel or outside an upper R corner of a lower flange. The method can obviously reduce the mold filling distance and solve the problem of long-distance feeding of large-size wheels, and simultaneously adopts a local mechanical pressurization mode to eliminate shrinkage cavity shrinkage porosity at the center wheel center, but because the pressure of the local mechanical pressurization is very high and far exceeds the pressure maintaining pressure of low-pressure or differential pressure casting, when the local mechanical pressurization is carried out, how to realize effective mold locking to ensure the local pressurization effect becomes a problem to be solved urgently.
Disclosure of Invention
In order to solve the technical problem, the invention provides a mold locking device for local pressurization in antigravity casting and antigravity casting equipment.
The complete technical scheme of the invention comprises the following steps:
the utility model provides a mould locking device is used in antigravity casting, mould locking device is used in antigravity casting includes side form locking portion, goes up mould locking portion and lower mould locking portion, side form locking portion is fixed in on 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 latch segment, be equipped with locking force drive mechanism on the locking force actuating mechanism of locking force drive mechanism, the side form latch segment is connected to locking force drive mechanism, have the inclined plane on the side form latch segment, go up and be equipped with the inclined plane that suits with side form locking block shape on mould locking portion and the lower mould locking portion.
The locking driving mechanism can drive the side mold locking part to move left and right.
When the mold is locked, the inclined plane of the side mold locking block is matched and attached with the inclined planes of the upper mold locking part and the lower mold locking part, and meanwhile, the side mold driving mechanism applies mold locking force to the attaching surface.
When the mold is locked, the inclined plane of the side mold locking block is positioned above the inclined planes of the upper mold locking part and the lower mold locking part.
The locking driving mechanism is a hydraulic oil cylinder, and the locking force transmission mechanism is a hydraulic rod.
Antigravity casting apparatus with the described device.
The antigravity casting equipment is low-pressure casting equipment or counter-pressure casting equipment.
The antigravity casting equipment further comprises a local pressurizing and refining device, and the local pressurizing and refining device comprises a local pressurizing mechanism and a refining mechanism;
the local pressurization mechanism is arranged in: the counter-gravity casting wheel mould comprises a pressure driving mechanism, a pressure transmission mechanism and a pressure applying mechanism below the position corresponding to the wheel center of the wheel, wherein the pressure applying mechanism is in contact with the metal melt and applies pressure to the metal melt after the mould filling is finished;
the refining mechanism is arranged on the anti-gravity casting wheel mould and above the position corresponding to the wheel center of the wheel, and refines the metal melt in the solidification process.
The pressure driving mechanism is a hydraulic oil 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 antigravity casting equipment comprises a mould, wherein a pouring gate on the mould is arranged on a circular ring surface right below a wheel rim.
Compared with the prior art, the invention has the advantages that:
the applicant proposes a multi-riser tube-based rapid sequential solidification wheel forming device and method, wherein a pouring gate of a mold is arranged right below a rim of a wheel. By using the liquid lifting and filling of the plurality of 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 be lower than 320 ℃ from the existing 420 ℃, the cooling speed and the cooling effect of the wheel are naturally accelerated, and the rapid sequential solidification is realized. And further improved, a local pressurizing device is added at the central position of the wheel, and the pressure applying mechanism is contacted with the molten metal and applies pressure to the molten metal after the mold filling is finished. So that the aluminum liquid is solidified under extremely high pressure, and the possibility of forming shrinkage cavity and shrinkage porosity defects is eliminated. However, the pressure of local mechanical pressurization is very high and far exceeds the pressure maintaining pressure of low-pressure or differential pressure casting, so that potential safety hazards are brought. When the device is applied to the multi-riser tube antigravity wheel casting forming 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 structural view of a wheel antigravity casting apparatus equipped with a mold clamping device according to the present invention, in an unlocked state.
Fig. 2 is a schematic structural view of a wheel antigravity casting apparatus with a mold clamping device according to the present invention in a locked state.
Fig. 3 is a schematic view of a wheel according to the prior art.
FIG. 4a illustrates a portion of the apparatus of FIG. 1 that is susceptible to air entrapment during filling.
Fig. 4b is a partial enlarged view of fig. 4 a.
FIG. 4c is a schematic view of the slow charging sequence of FIG. 4 a.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in figure 1, the mould locking device of the invention comprises a side mould locking part, an upper mould locking part and a lower mould locking part, wherein the side mould locking part is fixed on a side mould plate or a frame of the antigravity casting equipment through a connecting part and comprises a first side mould locking part and a second side mould locking part, each side mould locking part comprises a locking driving mechanism 11, a locking force transmission mechanism 12 and a side mould locking block 13, the locking force driving mechanism 11 can be any common driving mechanism in the prior art such as a hydraulic oil cylinder, a motor and the like, the hydraulic oil cylinder is preferably adopted and is provided with the locking force transmission mechanism, the locking force transmission mechanism is preferably provided with a hydraulic rod, the front end of the hydraulic rod is connected with the side mould locking block 13, each side mould locking block is similar to a semi-trapezoid in shape, the front end is provided with a forwardly protruding inclined surface 14, the inclined surface 14 is used for respectively pressing a corresponding upper mould locking part inclined surface 16 on the upper mould locking part 15 when mould, and the corresponding lower die locking part inclined plane on the lower die locking part.
The locking driving mechanism 11 can drive the side mould locking part to move left and right to perform mould opening and mould locking operations.
When in a mode locking state, the inclined plane of the side mold locking block is matched and attached with the inclined planes of the upper mold locking part and the lower mold locking part, and meanwhile, a side mold driving mechanism applies certain mode locking force to the attaching surface. When the mould is locked, the inclined plane of the side mould locking block is positioned above the inclined planes of the upper mould locking part and the lower mould 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 portion to move outwards to leave a die closing space, the upper die template descends to close the die, then the locking force driving mechanism 11 drives the side die locking portion to move inwards to enable two corresponding inclined surfaces to be matched and attached, the inclined surfaces of the side die locking blocks are located above the inclined surfaces of the upper die locking portion and the lower die locking portion, and the side die enters a die locking state as shown in fig. 2. A casting process is then performed. And after the unlocking is finished, the unlocking is carried out according to the reverse operation of the locking mode.
After the locking of the invention, when the local pressurizing device is used for locally pressurizing the filled aluminum liquid, the pressure is transmitted to the upper die through the aluminum liquid, and at the moment, the side die driving mechanism applies a certain die locking force to the joint surface of the upper die locking part and the side die locking part. The locking state of the die under extremely high pressure can be ensured, and the safety is obviously improved.
The following describes a wheel forming apparatus and associated processes used in conjunction with the present invention.
Fig. 3 is a view showing a typical wheel construction in which the central position of the wheel is generally referred to as the center of the wheel, the outer side of the wheel is fitted and fitted with a tire, the portion supporting the tire is referred to as the rim, the portion mounted and connected to the center of the wheel axle, and the portion of the wheel supporting the rim is referred to as the spoke, and a window is left between the spokes in the prior art. The portion of the rim that holds and supports the tire orientation is called the rim.
In the existing production of low-pressure or differential-pressure casting aluminum alloy wheels, a liquid lifting pipe is almost arranged at the center wheel center of the wheel, a melt enters a cavity from a pouring gate at the wheel center through a heat insulation cup and a pouring gate sleeve which are connected to the liquid lifting pipe, is divided under the action of a dividing cone, and is sequentially filled along the sequence of the wheel center, a spoke, a rim and a rim, and the cavity is filled with the melt to be solidified. Meanwhile, the area of the sprue is large, so that the mold filling speed is high. However, some problems caused by the above pouring and filling manner cannot be solved well all the time, for example, the gate distance is long, the filling distance is too long, the hot spot parts such as the connection of the rim and the spoke are very difficult to be fed, shrinkage cavities and shrinkage porosity are easy to form, and the problem that the production in the wheel industry is disturbed is solved. Although the cooling is enhanced by adopting water cooling, water mist cooling and the like to the part to realize sequential solidification, the wheel filling and the solidification time are short, so that the temperature field is difficult to control accurately, and waste products with a certain proportion are still generated inevitably.
In the prior art, a mode of bilateral pouring is adopted in the middle of the side surface of the rim, and the defects of shrinkage cavity and shrinkage porosity are easily formed due to uncontrollable filling and solidification sequences caused by filling and shunting.
Based on the problem, the invention provides a wheel forming device based on multiple liquid lifting channels, which comprises a heat preservation furnace 1 filled with aluminum liquid, wherein a high-pressure air source is connected in the heat preservation furnace, a plurality of liquid lifting pipes 2 are arranged in the heat preservation furnace, and the lower parts of the liquid lifting pipes are immersed in the aluminum liquid 3, as shown in fig. 1. When a high-pressure air source is adopted to pressurize the aluminum liquid in the furnace, the aluminum liquid can rise along the plurality of liquid lifting pipes. The upper part of the riser tube is connected with a pouring gate of the mould through a vacuum cup and a special-shaped pouring gate component 4 disclosed by the invention and enters a cavity 5 of the mould. The special-shaped pouring gate pouring component comprises a pouring gate cup and a special-shaped pouring gate sleeve positioned above the pouring gate cup.
The gate of the mold is arranged on a circular ring surface right below a rim of the wheel, and particularly, the circular ring surface right below the rim in the invention refers to a circular ring surface which is formed on one side, opposite to a wheel flange, of the rim and surrounds the central axis of the wheel. The excircle forming the 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 mold is also arranged at the position.
In particular, the gate and the gate sleeve may be provided on the annular surface at a position corresponding to the outside of the window region, or may be provided on the annular surface at a position corresponding to the connection between the rim and the spoke.
In a preferred embodiment, the gates may be provided in two, may be symmetrically provided on both sides of the wheel, or may be provided in a plurality around the wheel axis. Corresponding with this runner, the stalk can set up to two, can set up in wheel bilateral symmetry, also can be for encircleing the wheel axis and set up a plurality of stalks.
The device can obviously reduce the mold filling distance and solve the problem of long-distance feeding of large-size wheels. The late filling and solidification time at the wheel center position and the possibility of a problem of liquid flow convergence, possibly with casting defects such as shrinkage porosity and inclusions at this point. Therefore, a local pressurizing and thinning device is added, and comprises a local pressurizing mechanism or/and a thinning mechanism; the local pressurizing mechanism is arranged below the mould and below the position, corresponding to the wheel center, on the mould and comprises a pressure driving mechanism, a pressure transmission mechanism and a pressure applying mechanism, wherein the pressure applying mechanism is in contact with the metal melt and applies pressure to the metal melt after the mould filling is finished; the refining mechanism is arranged above the wheel die and above the position corresponding to the wheel center of the wheel, and refines the metal melt in the solidification process. 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 mechanical pressure of 1000 KPa-120 MPa after the mold filling is finished. So that the aluminum liquid is solidified under extremely high pressure, and the defect of shrinkage cavity and shrinkage porosity formed at the position due to insufficient edge feeding pressure is prevented.
The thinning mechanism is an ultrasonic thinning mechanism or a vibration thinning mechanism. The vibration generator 9 and the vibration rod 10 are included in the specific embodiment, the vibration rod 10 is inserted into the aluminum liquid, and the aluminum liquid is vibrated in the solidification process, so that dendritic crystals formed by crystallization of the aluminum liquid are broken, nucleation is enhanced, crystal grains are refined, and the mechanical performance of the wheel is improved.
The invention also discloses a low-pressure/counter-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 original solidification process can not be suitable for the invention.
The method specifically comprises the following steps:
(1) the locking driving mechanism drives the side mold locking part to move outwards to leave a mold closing space, then the lower mold, the upper mold and the side mold are closed, after the lower mold, the upper mold and the side mold are closed, the locking driving mechanism drives the side mold locking part to move inwards to enable the two inclined surfaces to be matched and attached, and the inclined surface of the side mold locking block is positioned above the inclined surface of the upper mold locking part and enters a mold locking state;
(2) liquid lifting: pressurizing the aluminum liquid in the heat preservation furnace through a high-pressure air source, so that the aluminum liquid rises to the position of the pouring gate along the liquid lifting pipe under the pressure, wherein the pressure rising speed at the stage is 2.8-4.0 KPa/s, and the pressure is increased to 20 KPa;
(3) filling a mold: continuously boosting to enable the aluminum liquid to enter the cavity through the pouring gate, wherein the filling stage is two-stage pressurization, the boosting speed of the first stage is 0.1-0.2 KPa/s, the time is 2-4 s, and then the second stage is started to boost quickly until the cavity is full, and the pressure reaches 35KPa at the moment;
the boosting speed P' in the second stage is determined as follows:
in the formula:
p' is the pressure increasing speed with the unit of kPa/s; h is the total height of the cavity and the unit is mm; rho is the density of the metal melt and has the unit of g/cm3(ii) a K is a resistance coefficient, and the value range of K is 1-1.5; t is preset mold filling time with the unit of s, preferably 10 s; 102 is a unit conversion coefficient; n is the number of the lift tubes, the value range of N is 2-6, the number can be selected according to the number of windows of wheels of different types, and 2-4 is preferred; and x is the liquid raising index of the steel plate, the value range is 0.2-0.8, and in the wheel type scheme adopted in the embodiment, the value is 0.5.
(4) And (3) crystallization, pressurization and pressure maintaining: after the mold filling is finished, the pressure is rapidly increased to 150KPa at the boosting speed of 8-10 KPa/and is maintained for 60-150 s, and the wheel solidification is finished.
(5) Pressure relief and air release: and (4) after the aluminum alloy wheel is solidified, relieving 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 to the heat preservation furnace.
(6) Unlocking and opening the mold, ejecting the casting and entering the next production cycle.
For the selection of the pressure increasing speed in the liquid lifting stage and the mold filling stage, the inner diameter of the liquid lifting pipe is fixed during liquid lifting, and turbulence is basically not generated, so that the metal melt can quickly lift to the position of a pouring gate by adopting the quick pressure increasing speed, and the liquid lifting time is shortened. In the mold filling stage, the complicated shapes of the cavity and the sprue are considered, in the traditional mold filling mode, because a mode of pouring from the position of the wheel center is adopted, the sectional areas of the liquid lifting pipe and the sprue are not greatly different, and the sectional area of the cavity at the wheel center is large, turbulence is not easy to generate, so that the mold filling and pressure boosting speed can be obtained by experience or experiment. The invention adopts the mould filling mode on the circular ring surface of the rim, the mould filling mode is an irregular conformal gate, the shape area difference between the liquid lifting pipe and the gate is large, and the space at the rim is small, so that turbulent air entrainment is easy to generate if the mould filling pressure is unreasonable, and the defect of air holes is caused. The mold filling pressure design in the prior art adopts a calculation mode in an ideal state and is corrected by combining a resistance coefficient and the like. No consideration is given to the change in the flow conditions caused by the change in the cross-sectional areas of the lift tube and the gate. Therefore, the ideal mold-filling boosting speed cannot be obtained by adopting the empirical formula in the prior art.
The present inventors have therefore studied the above problems in combination with the riser, the gate, the shape and cross-sectional area of the cavity above the gate, and the flow characteristics of the molten metal. It was found that for the wheel rim position, as indicated by the arrow in fig. 4a, there are two locations with significantly varying areas in the initial stage of the mold filling, as indicated by the arrow in fig. 4b, where the gas entrapment is very likely to form if turbulence is generated, and it was designed and calculated that the present invention employs two-stage pressurization, the first stage significantly reduces the pressure rise rate to allow the molten metal to flow smoothly in the initial stage of the mold filling, fills the above-mentioned areas to avoid gas entrapment, as shown in fig. 4c (where the arrow is the direction of the melt filling), and then enters the second stage for rapid pressure rise to shorten the mold filling time. In the second stage of the mold filling process, researches show that the mold filling stability and the number of the liquid lifting pipes are obviously related, and because the traditional mode of pouring from the position of the center of the wheel only has one liquid lifting pipe and one pouring gate, the rules can be obtained through tests and quantitative treatment can be carried out. In the mold filling mode of the invention, the number of the liquid lifting pipes and the gates can be 2 or more. Under the same pressure increasing condition, the flow rate at the pouring gate and the flow rate in the square cavity above the pouring gate can be obviously changed, so that the mold filling flow mode is uncontrollable. Therefore, the invention obtains the pressure boosting mode of the second stage through research, and as can be seen from the formula (1), the applicable pressure boosting speed can be gradually increased along with the increase of the number of the liquid lifting pipes in the same preset mold filling time, and the problems of turbulent air entrainment and the like can not be caused. The resistance coefficient value is related to the viscosity of molten metal, the complexity of a casting 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:
2 liquid lifting pipes and pouring gates are adopted, and the metal melt comprises the following components in percentage by mass: 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%, 0.05-0.15% of Fe, Mn: 0.05-0.1%, Ti: 0.08-0.14%, and the balance of Al and inevitable impurities.
(1) The locking driving mechanism drives the side mold locking part to move outwards to leave a mold closing space, then the lower mold, the upper mold and the side mold are closed, after the lower mold, the upper mold and the side mold are closed, the locking driving mechanism drives the side mold locking part to move inwards to enable the two inclined surfaces to be matched and attached, and the inclined surface of the side mold locking block is positioned above the inclined surface of the upper mold locking part and enters a mold locking state;
(2) liquid lifting: pressurizing the aluminum liquid in the heat preservation furnace by a high-pressure air source, so that the aluminum liquid rises to the position of the pouring gate along the liquid lifting pipe under the pressure, wherein the pressure rising speed at the stage is 3.5KPa/s, and the pressure is increased to 20 KPa;
(3) filling a mold: and continuously boosting, so that the molten aluminum enters the cavity through the pouring gate, the boosting speed of the first stage is 0.2KPa/s, the time is 1.8s, the area shown by an arrow in the figure 4b is stably filled with the molten metal, and then the molten metal enters the second stage and is rapidly filled with the molten metal at the boosting speed of 0.66KPa/s until the cavity is filled.
(4) And (3) crystallization, pressurization and pressure maintaining: after the mold filling is finished, the pressure is quickly increased to 150KPa at the boosting speed of 8 KPa/and is maintained, the hydraulic oil cylinder drives the hydraulic rod driving pressure block to apply the mechanical pressure of 2000KPa to the wheel center position, and the vibration generator drives the vibration rod to vibrate and refine the aluminum liquid until the wheel solidification is finished. In the pressure maintaining process, the high pressure of the rim hot spot is always kept at the sprue, and the possibility of shrinkage cavity and shrinkage porosity at the sprue is completely eliminated under the feeding of high-pressure aluminum liquid. Meanwhile, the pressure block locally pressurizes the molten metal at the center, so that the possibility of generating shrinkage cavities and shrinkage porosity at the center is eliminated.
(5) Pressure relief and air release: and (4) after the aluminum alloy wheel is solidified, relieving 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 to the heat preservation furnace.
(6) Unlocking and opening the mold, ejecting the casting and entering the next production cycle.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a mould locking device is used in antigravity casting, its characterized in that, mould locking device is used in antigravity casting includes side form locking portion, goes up mould locking portion and lower mould locking portion, side form locking portion is fixed in on 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 latch segment, be equipped with locking force drive mechanism on the locking force actuating mechanism of locking force drive mechanism, the side form latch segment is connected to locking force drive mechanism, have the inclined plane on the side form latch segment, go up mould locking portion and lower mould locking portion and be equipped with the inclined plane that suits with side form latch segment form.
2. The apparatus according to claim 1, wherein the locking driving mechanism drives the locking portion of the side mold to move left and right.
3. The apparatus according to claim 2, wherein the inclined surface of the side mold locking piece is engaged with the inclined surfaces of the upper mold locking portion and the lower mold locking portion in a mold locking state, and the side mold driving mechanism applies a mold locking force to the engaging surface.
4. The mold clamping apparatus for antigravity casting according to claim 3, wherein in the mold clamping state, the inclined surface of the side mold clamping piece is positioned above the inclined surfaces of the upper mold clamping part and the lower mold clamping part.
5. Countergravity casting apparatus with the apparatus of any one of claims 1 to 4.
6. The countergravity casting apparatus of claim 5, wherein the countergravity casting apparatus is a low pressure casting apparatus or a counter pressure casting apparatus.
7. The countergravity casting apparatus of claim 6, further comprising a localized pressurization and refinement device comprising a localized pressurization mechanism and a refinement mechanism;
the local pressurization mechanism is arranged in: the counter-gravity casting wheel mould comprises a pressure driving mechanism, a pressure transmission mechanism and a pressure applying mechanism below the position corresponding to the wheel center of the wheel, wherein the pressure applying mechanism is in contact with the metal melt and applies pressure to the metal melt after the mould filling is finished;
the refining mechanism is arranged on the anti-gravity casting wheel mould and above the position corresponding to the wheel center of the wheel, and refines the metal melt in the solidification process.
8. The antigravity casting apparatus of claim 7 wherein the pressure drive mechanism is a hydraulic ram, the pressure transfer mechanism is a hydraulic ram and the pressure applying mechanism is a pressure block.
9. The countergravity casting apparatus of claim 7, wherein the attenuation mechanism is an ultrasonic attenuation mechanism or a vibratory attenuation mechanism.
10. The antigravity casting apparatus of claim 7 or 8, wherein the antigravity casting apparatus includes a mold having a gate opening in a torus directly below a wheel rim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010842925.6A CN111889652A (en) | 2020-08-20 | 2020-08-20 | Anti-gravity casting is mould locking device and anti-gravity casting equipment for local pressurization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010842925.6A CN111889652A (en) | 2020-08-20 | 2020-08-20 | Anti-gravity casting is mould locking device and anti-gravity casting equipment for local pressurization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111889652A true CN111889652A (en) | 2020-11-06 |
Family
ID=73229844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010842925.6A Pending CN111889652A (en) | 2020-08-20 | 2020-08-20 | Anti-gravity casting is mould locking device and anti-gravity casting equipment for local pressurization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111889652A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117900379A (en) * | 2024-03-19 | 2024-04-19 | 潍坊精远模具有限公司 | 3D prints sand mould antigravity casting forming device |
-
2020
- 2020-08-20 CN CN202010842925.6A patent/CN111889652A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117900379A (en) * | 2024-03-19 | 2024-04-19 | 潍坊精远模具有限公司 | 3D prints sand mould antigravity casting forming device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111673072B (en) | Wheel forming device and method based on multi-lift-tube central pressurization | |
| CN111804888A (en) | Wheel antigravity casting equipment with crucible heat preservation stove | |
| CN105583393B (en) | Sequential pressure boost method after crystallization pressure maintaining and for metal-mould low-pressure casting forming of aluminum alloy automobile chassis cast parts | |
| CN105642866B (en) | A kind of aluminum-alloy wheel metal-mold low-pressure casting shaping crystallization boosting method | |
| CN105598418B (en) | A kind of Quick-pressurizing method after aluminium alloy automobile chassis casting metal-mold low-pressure casting shaping pressurize | |
| CN106925756A (en) | A kind of low-pressure casting preparation method of aluminum alloy auxiliary vehicle frame | |
| CN108326256A (en) | A kind of low pressure fills type High Pressure Solidification casting device and casting method | |
| CN104190899A (en) | Low-pressure casting mold of melt spinning wheel and process thereof | |
| CN105583394B (en) | Sequential pressurization method after crystallization pressure keeping for metal mold low-pressure casting molding of aluminum alloy wheel | |
| CN105583395B (en) | A kind of aluminium alloy automobile chassis casting metal-mold low-pressure casting shaping crystallization boosting method | |
| CN111673071B (en) | Device and method for rapid sequential solidification forming of wheels based on multiple lift tubes | |
| CN111822672A (en) | Local high pressure boost and refine device and adopt device's antigravity casting equipment | |
| CN111069569A (en) | Low-pressure filling type gravity compensation type casting mold and casting method thereof | |
| CN108296468A (en) | A kind of pressure regulation supercharging casting machine fills the casting device and casting method of type High Pressure Solidification with low pressure | |
| CN111889652A (en) | Anti-gravity casting is mould locking device and anti-gravity casting equipment for local pressurization | |
| CN105689688B (en) | A kind of aluminum-alloy wheel metal-mold low-pressure casting shaping crystallization pressurize boosting method | |
| CN212792949U (en) | Wheel forming device based on central pressurization of multiple liquid lifting channels | |
| CN105618710B (en) | A kind of Quick-pressurizing method after aluminum-alloy wheel metal-mold low-pressure casting shaping pressurize | |
| CN212761058U (en) | Wheel forming device based on many liter liquid passageways | |
| JP5046106B2 (en) | Low pressure casting apparatus and low pressure casting method | |
| CN212329617U (en) | Anti-gravity casting is mould locking device and anti-gravity casting equipment for local pressurization | |
| CN109482842B (en) | Counter-pressure casting method for aluminum alloy driving wheel assembly blank with steel-aluminum composite structure | |
| CN112570684A (en) | Integral extrusion casting device for aluminum alloy wheel and extrusion casting process and application thereof | |
| CN212792950U (en) | Wheel antigravity casting is with local high pressure boost and device refines | |
| CN212598801U (en) | Pouring assembly suitable for multiple riser tube side pouring |
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 |