A vibration-assisted precision casting device for complex thin-walled castings

Abstract

The application discloses a kind of complex thin-walled castings of vibration auxiliary precision casting equipment applied to foundry equipment field, for the low transmission efficiency of traditional mould outside vibration scheme, energy attenuation is big, and single parameter vibration cannot adapt to the pain point of whole process demand, vibration auxiliary die casting scheme based on stage intelligent control is proposed.The equipment is matched with multiple vertical vibrators by auxiliary vibration control system, and three vibration modes of low frequency, high frequency and auxiliary demolding are matched for three process stages of slow injection filling, filling and demolding, and vibration energy is directly applied to the metal liquid inside the cavity.Compared with the traditional scheme, the application can reduce the viscosity of the metal liquid, improve the flowability of the filling, and also promote the bubble discharge and grain refinement directly through high-frequency vibration, significantly improve the density and mechanical properties of the casting, and reduce the deformation risk of the thin-walled part through pre-vibration in the demolding stage, finally effectively improve the forming quality and finished product qualification rate of complex thin-walled castings.

Description

Technical Field

[0001] This invention relates to the field of casting equipment, and in particular to a vibration-assisted precision casting device for complex thin-walled castings. Background Technology

[0002] Complex thin-walled castings are widely used in automotive lightweighting, new energy, 3C electronics, aerospace, and medical devices. The core forming process is high-pressure die casting (HPDC), with some applications combining semi-solid die casting or vacuum die casting.

[0003] Chinese invention CN116944462B discloses a thin-walled die-casting mold, including a base; a die-casting mechanism; and a conveying mechanism. The conveying mechanism is installed on the die-casting mechanism. The push block at the bottom of the moving mold pushes the top plate, which on the one hand realizes the conveying of the previous thin-walled part, and on the other hand provides space for the placement of the next thin-walled part as the conveyor belt moves.

[0004] Chinese invention CN115041658B discloses a die-casting device for thin-walled aluminum alloy die-casting parts. This invention solves the problem that existing devices require manual material removal after die-casting and can only produce one casting at a time, resulting in low efficiency.

[0005] Existing vibration-assisted die casting solutions use external vibration, which has drawbacks: poor process adaptability, and a single vibration parameter cannot meet the needs of different stages such as filling, solidification, and demolding; complex thin-walled castings are prone to cold shuts, under-casting, and porosity defects, resulting in low density, poor mechanical properties, and low yield. Vacuum adsorption and adhesion during demolding can easily cause casting deformation and cracking, further reducing the yield. Summary of the Invention

[0006] The core of this invention lies in achieving multi-process, multi-mode vibration control through an auxiliary vibration control system in conjunction with multiple vertical vibrators. This system matches corresponding frequencies of vibration to different casting stages, directly acting on the mold cavity and molten metal, thus solving the problem that existing vibration measures cannot adapt to the needs of different die-casting processes. Simultaneously, staged vibration control improves mold filling fluidity, promotes bubble removal, and optimizes the demolding process, effectively improving the molding quality and finished product qualification rate of complex thin-walled castings.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A vibration-assisted precision casting device for complex thin-walled castings includes an upper mold and a lower mold that cooperate with each other. The upper mold is equipped with a molten metal injection head, and an upper mold core is installed inside the upper mold. A lower mold core is installed inside the lower mold, and a cavity is formed between the upper and lower mold cores. The device is characterized by: a guide post matching the molten metal injection head installed inside the upper mold, with a molten metal injection channel on the guide post; the cavity is connected to the molten metal injection head through the molten metal injection channel; multiple vertical vibrators and cylinders for driving the vertical vibrators to move vertically are installed inside the lower mold; a vibration table and multiple demolding columns are provided inside the lower mold; each vibration table and demolding column is connected to a vertical vibrator; a docking groove matching the vibration table is provided on the guide post; when the upper and lower molds are closed, the guide post docks with the vibration table; and a vibration column is slidably installed inside the vibration table. The demolding column is matched with the cavity position, and a vibrating column is slidably and sealed inside the demolding column; the vertical vibrator includes a base connected to the cylinder extension end, an electromagnet and a vibrating body, the electromagnet is ring-shaped and sleeved around the vibrating body, and the vibrating body is fixedly connected to the vibrating column or the vibrating column.

[0009] Furthermore, the demolding column includes a hollow column, the lower end of which is connected to a mating seat. The hollow column has a sliding cavity that matches the vibrating column. A sealing ring is provided on the inner wall of the sliding cavity. The sealing ring is used to maintain a sealed fit between the two during the sliding process of the vibrating column relative to the hollow column.

[0010] Furthermore, the vibration table has a sliding hole in the middle that matches the vibrating body, and the vibrating column is sealed and slidably connected to the sliding hole. The vibrating column is engaged with the mating groove when the upper mold and the lower mold are closed.

[0011] Furthermore, it also includes an auxiliary vibration control system, which includes a data acquisition module, a data processing module, and a control module; The data acquisition module is used to collect the real-time vibration frequency parameters of multiple vertical vibrators, the filling progress signal of the molten metal inside the cavity, and the actual displacement stroke signal of the cylinder. The acquired analog signals are converted into digital signals that can be transmitted and processed and then sent to the data processing module. The data processing module receives the acquisition signals transmitted by the data acquisition module, compares and matches the real-time acquisition parameters with the preset parameter thresholds for the slow injection filling stage, filling completion stage, and demolding stage, determines the current casting process stage of the equipment, and generates control commands for the corresponding working mode to be output to the control module. The control module receives control commands from the data processing module and adjusts each vertical vibrator to switch to the corresponding working mode according to the commands.

[0012] Furthermore, the operating modes of the vertical vibrator include: low-frequency vibration mode, high-frequency vibration mode, and assisted demolding mode.

[0013] Furthermore, when the low-frequency vibration mode is working, the vertical vibrator is controlled to drive the guide column to vibrate at a set first frequency. The vibration energy is transferred to the molten metal filling the cavity through the guide column. The low-frequency vibration mode is used in the slow injection molding stage.

[0014] Furthermore, when the high-frequency vibration mode is working, the vertical vibrator switches to the high-frequency vibration mode, causing the vibrating column to vibrate at a set second frequency. The high-frequency micro-vibration of the vibrating column directly acts on the molten metal in the mold cavity to promote the breaking and discharge of air bubbles in the molten metal. The high-frequency vibration mode is used when the molten metal filling is completed.

[0015] Furthermore, when the assisted demolding mode is working, the vibrating column vibrates at the set third frequency to drive the molded casting to produce a slight displacement, thereby breaking the vacuum adsorption effect and adhesion force between the casting and the cavity sidewall. Then, in conjunction with the lifting action of the demolding column, the casting can be smoothly ejected and demolded. The assisted demolding mode is used in the demolding stage after molding.

[0016] Compared with the prior art, the advantages of this invention are: (1) This scheme achieves multi-process, multi-mode vibration control through an auxiliary vibration control system in conjunction with multiple vertical vibrators. It can automatically match the corresponding frequency vibration for the three different process stages of slow injection filling, filling completion, and demolding, and directly apply the vibration energy to the molten metal inside the cavity. Compared with traditional external vibration and single-parameter vibration schemes, this scheme has stronger process adaptability and higher vibration energy transfer efficiency. In the slow injection filling stage, low-frequency vibration can significantly reduce the apparent viscosity of the molten metal, improve its fluidity, and allow it to spread evenly in the complex thin-walled cavity in a stable laminar flow state. This effectively solves the defects such as cold shut and undercasting that are prone to occur when producing complex thin-walled castings in the existing technology, and greatly improves the molding qualification rate.

[0017] (2) This solution uses a cylinder to drive a vertical vibrator to directly insert a vibrating column into the molten metal inside the mold cavity. High-frequency vibration promotes the breaking and floating of air bubbles, which not only significantly improves the internal density of the casting but also refines the solidified grain structure, fundamentally improving the overall mechanical properties of the casting. This solves the problems of long vibration transmission paths, large energy attenuation, and poor degassing and grain refinement effects of traditional solutions. During the demolding stage, auxiliary vibration is applied in advance to break the vacuum adsorption and adhesion between the casting and the mold cavity wall. Combined with the lifting of the demolding column, demolding is completed, which effectively reduces the demolding difficulty of thin-walled castings, avoids deformation and breakage of the casting during the ejection process, and further improves the finished product qualification rate and production efficiency. Attached Figure Description

[0018] Figure 1 This is a perspective view of the exploded state of the mold of the present invention; Figure 2 for Figure 1Schematic diagram of the structure at point A; Figure 3 This is a perspective view of the mold in its closed state according to the present invention; Figure 4 This is a side sectional view of the present invention; Figure 5 for Figure 4 Schematic diagram of the structure at point B; Figure 6 for Figure 4 Schematic diagram of the structure at point C; Figure 7 for Figure 4 Schematic diagram of the structure at point D; Figure 8 This is a three-dimensional schematic diagram of the demolding column of the present invention.

[0019] Explanation of the labels in the diagram: 1. Upper mold; 101. Upper mold core; 2. Lower mold; 201. Lower mold core; 3. Fluid injection head; 4. Guide pillar; 401. Fluid injection channel; 402. Docking groove; 5. Vertical vibrator; 501. Base; 502. Electromagnet; 503. Vibrating body; 6. Vibrating table; 61. Vibrating column; 7. Demolding column; 701. Hollow column; 702. Docking seat; 8. Vibrating column; 9. Cylinder. Detailed Implementation

[0020] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0021] First implementation method: Please see Figures 1-8 A vibration-assisted precision casting device for complex thin-walled castings includes an upper mold 1 and a lower mold 2 that cooperate with each other. The upper mold 1 is equipped with a molten metal injection head 3. An upper mold core 101 is installed inside the upper mold 1, and a lower mold core 201 is provided inside the lower mold 2. After the upper mold core 101 and the lower mold core 201 are closed, the forming surfaces of the upper mold core 101 and the lower mold core 201 together form a closed cavity that matches the shape of the casting to be formed. A guide post 4 that matches the molten metal injection head 3 is installed inside the upper mold 1, and a molten metal injection channel is opened on the guide post 4. The cavity is connected to the molten metal injection head 3 through the molten metal injection channel. The lower mold 2 is equipped with multiple vertical vibrators 5 and a cylinder 9 for driving the vertical vibrators 5 to move in the vertical direction. The lower part of the lower mold 2 is provided with an installation cavity for setting the vertical vibrators 5. The vertical vibrator 5 includes a base 501 connected to the telescopic end of the cylinder 9, an electromagnet 502, and a vibrating body 503. The telescopic movement of the cylinder 9 drives the base 501 and the vertical vibrator 5, demolding column 7, and vibrating column 8 mounted on it to move up and down synchronously.

[0022] An electromagnet 502 is annularly sleeved around the vibrator 503. In the vertical vibrator 5 connected to the demolding column 7, the electromagnet 502 can be inserted into the demolding column 7. The top of the vibrator 503 is fixedly connected to the vibrating column 8. In the vertical vibrator 5 connected to the vibration table 6, the electromagnet 502 can be inserted into the sliding hole. The top of the vibrator 503 is fixedly connected to the vibrating column 61. The top of the vibrating column 8 is provided with a support plate that matches the vibrating column 8, and a locking block is provided in the middle of the support plate. A return spring is connected between the support plate and the top of the electromagnet 502. The bottom of the vibrating column 8 is provided with a slot that matches the locking block. The electromagnet 502 is electrically connected to a frequency converter power supply installed outside the mold. The frequency converter power supply realizes the switching of vibration mode and the adjustment of vibration parameters by adjusting the frequency and voltage amplitude of the output current.

[0023] The lower mold 2 is equipped with a vibration table 6 and multiple demolding columns 7. The vibration table 6 and demolding columns 7 are each connected to a vertical vibrator 5. The guide column 4 is provided with a docking groove that matches the vibration table 6. When the upper mold 1 and the lower mold 2 are closed, the guide column 4 docks with the vibration table 6. The demolding column 7 is matched with the cavity position, and the demolding column 7 is slidably sealed with a vibration column 8. The vibrating column 8 is a cylindrical rod-shaped structure made of precipitation-hardening stainless steel or titanium alloy that is resistant to high temperature and oxidation. The fitting clearance between its outer diameter and the inner diameter of the sliding cavity inside the hollow column 701 is about 0.01 mm to 0.03 mm.

[0024] The demolding column 7 includes a hollow column 701, and a docking seat 702 is connected to the lower end of the hollow column 701. The hollow column 701 and the docking seat 702 are an integral structure, and the docking seat 702 is fixedly connected to the top of the base 501 by bolts. The hollow column 701 has a sliding cavity that matches the vibrating column 8. A sealing ring is provided on the inner wall of the sliding cavity. The sealing ring is used to maintain a sealed fit between the vibrating column 8 and the hollow column 701 during the sliding process. After the vibrating column 8 is inserted, the sealing ring forms an interference seal with its outer cylindrical surface, which effectively prevents the molten metal in the cavity from seeping into the demolding column 7 through the fit gap between the vibrating column 8 and the hollow column 701 under the filling pressure. The sealing ring is made of high temperature resistant material, such as polytetrafluoroethylene or graphite fiber reinforced composite material, and its working temperature range covers the temperature range of the molten metal used in die casting.

[0025] The vibrating table 6 has a sliding hole in the middle that matches the vibrating body 503, and a vibrating column 61 is slidably connected inside the sliding hole, and an electromagnet 502 can be inserted into the sliding hole; the vibrating column 61 engages with the mating groove when the upper mold 1 and the lower mold 2 are closed. (When the vibrating body 503 of the vertical vibrator 5 vibrates, the vibration is transmitted to the guide column 4 through the vibrating column 61, so that the molten metal injected by the flushing head 3 carries vibration energy in the early stage of filling.) It also includes an auxiliary vibration control system, which includes a data acquisition module, a data processing module, and a control module; The data acquisition module is used to acquire the real-time vibration frequency parameters of multiple vertical vibrators 5, the filling progress signal of the molten metal inside the cavity, and the actual displacement stroke signal of the cylinder 9, and then convert the acquired analog signals into digital signals that can be transmitted and processed before sending them to the data processing module. The data acquisition module is connected to the acceleration sensor installed on each vertical vibrator 5, the filling progress sensor installed on the displacement detection end of the flushing head or injection punch, and the linear displacement sensor installed on the cylinder body or piston rod. Each sensor synchronously acquires signals at a sampling frequency of not less than 1kHz.

[0026] The data processing module receives the acquisition signals transmitted by the data acquisition module, compares and matches the real-time acquisition parameters with the preset parameter thresholds for the slow injection filling stage, filling completion stage, and demolding stage, determines the current casting process stage of the equipment, and generates control commands for the corresponding working mode to be output to the control module. The control module receives control commands from the data processing module and adjusts each vertical vibrator 5 to its corresponding operating mode according to the commands. The control module is connected to a frequency converter drive power controller and a cylinder solenoid directional valve controller. The frequency converter drive power controller switches vibration modes and adjusts vibration parameters by regulating the frequency and amplitude of the current output to the electromagnet excitation coil. The cylinder solenoid directional valve controller precisely controls the cylinder's extension and retraction stroke and speed by controlling the direction and flow of compressed air. The three modules communicate in real-time via an industrial fieldbus.

[0027] The vertical vibrator 5 has the following operating modes: low-frequency vibration mode, high-frequency vibration mode, and assisted demolding mode.

[0028] When the low-frequency vibration mode is working, the vertical vibrator 5 is controlled to drive the guide column 4 to vibrate at a set first frequency. The vibration energy is transferred to the molten metal filling the cavity through the guide column 4. The low-frequency vibration mode is used in the slow injection filling stage. The first frequency ranges from 5Hz to 200Hz, and the amplitude ranges from 0.05mm to 2.0mm. Specific parameters are automatically retrieved from the parameter database by the data processing module based on the wall thickness characteristics of the casting and the physical properties of the molten metal. Under low-frequency vibration, the apparent viscosity of the molten metal decreases, its fluidity increases, and it can spread in a stable laminar flow state in complex thin-walled cavities, effectively suppressing cold shut defects caused by turbulent gas entrapment.

[0029] When operating in high-frequency vibration mode, the vertical vibrator 5 switches to high-frequency vibration mode, causing the vibrating column 8 to vibrate at a set second frequency. The high-frequency micro-vibration of the vibrating column 8 directly acts on the molten metal within the mold cavity, promoting the breaking and removal of air bubbles in the molten metal. High-frequency vibration mode is used when the molten metal filling is complete. The second frequency ranges from 15kHz to 40kHz, and the amplitude ranges from 5μm to 50μm. (In high-frequency vibration mode, the cylinder 9 can drive the vertical vibrator 5 to rise, so that the demolding column 7 and the vibration column 8 can be further inserted into the cavity, so that the vibration column 8 can vibrate at different positions, increasing the range and intensity of action. The top of the vibration column 8 directly contacts the molten metal in the cavity, causing the tiny bubbles dispersed in the molten metal to collapse rapidly and coalesce into large bubbles that float to the surface and are discharged.)

[0030] In the assisted demolding mode, the vibrating column 8 vibrates at a set third frequency, causing a slight displacement of the entire molded casting. This disrupts the vacuum adsorption effect and adhesion force between the casting and the cavity sidewall. Then, in conjunction with the lifting action of the demolding column 7, the casting can be smoothly ejected and demolded. The assisted demolding mode is used in the demolding stage after molding. The third frequency ranges from 10Hz to 50Hz, the amplitude is from 0.1mm to 1.0mm, and the vibration duration is from 1 second to 5 seconds.

[0031] This implementation method can achieve precise vibration control in each process, adapt to the process requirements of the entire casting process for complex thin-walled castings, and adapt to the production of castings of different specifications.

[0032] Second implementation method: Please see Figures 1-8 This embodiment is based on the equipment of the first implementation method, and further describes the working process of a complete casting production cycle of the equipment; Taking a typical complex thin-walled die-casting part of the new energy vehicle electronic control housing, made of ADC12 aluminum alloy, with casting outline dimensions of 350mm×250mm×60mm, minimum wall thickness of 1.8mm, and average wall thickness of 3.5mm as an example, the specific workflow is as follows.

[0033] S1, Mold Closure Preparation: Insert the upper mold core 101 into the upper mold 1 and the lower mold core 201 into the lower mold 2. Drive the upper mold 1 and the lower mold 2 to close. During the mold closing process, the lower end of the guide column 4 is aligned with the vibrating column 61 in the middle sliding hole of the vibrating table 6 to complete the docking. After the mold is closed, the forming surfaces of the upper mold core 101 and the lower mold core 201 together enclose a closed cavity that is consistent with the shape of the casting to be formed. All vertical vibrators 5 are initially in the lower position. The tops of the demolding column 7 and the vibrating column 8 are flush with the cavity wall. The equipment is ready to be injected with liquid after mold closing. The auxiliary vibration control system performs a power-on self-test: the data acquisition module's sensor channels communicate normally, the data processing module's parameter database is loaded, and the control module's actuator channels communicate normally. The data processing module retrieves the low-frequency vibration mode parameter group corresponding to the slow pressure injection molding stage from the parameter database based on the currently loaded process parameter package.

[0034] S2, Slow Pressure Injection Filling Operation: The molten metal head 3 injects molten metal into the injection channel 401 of the guide column 4, and the molten metal flows into the closed cavity through the injection channel 401; the data acquisition module of the auxiliary vibration control system collects real-time vibration parameters, filling signals, and cylinder 9 displacement signals and converts them into digital signals and sends them to the data processing module. The data processing module determines that it is currently in the slow pressure injection filling stage and outputs a low-frequency vibration mode control command to the control module; the control module adjusts the equipment to start the low-frequency vibration mode, and the vibrator 503 of the vertical vibrator 5 under the vibration table 6 generates low-frequency vibration at the set first frequency. The vibration is transmitted to the guide column 4 through the vibration column 61, and then the vibration energy is transferred to the molten metal injected into the cavity, improving the fluidity of the molten metal and avoiding cold shuts and under-casting defects in thin-walled castings. During this stage, the vertical vibrator 5 in other positions remains on standby. The first frequency can be set to 60Hz, and the amplitude can be set to 0.25mm. The injection punch pushes the ADC12 aluminum alloy melt (melt temperature is 660℃ to 680℃) at a slow speed of 0.15m / s into the cavity through the injection channel 401 of the injection head 3 and the guide column 4. The data acquisition module continuously collects the actual vibration frequency and amplitude signals of each group of vertical vibrators 5 at a sampling frequency of not less than 1kHz.

[0035] S3, High-frequency vibration after filling: After the cavity is filled with molten metal, the data processing module matches the parameter threshold to determine that the filling is complete and outputs a high-frequency vibration mode control command; the control module adjusts all vertical vibrators 5 to switch to high-frequency vibration mode, and the vibrator 503 generates high-frequency vibration at the set second frequency. The vibration energy is directly transferred to the molten metal through the vibration column 8, which promotes the breaking and floating of bubbles in the molten metal and refines the solidified grain structure. During this process, the sealing ring in the sliding cavity of the demolding column 7 always maintains the interference seal between the vibration column 8 and the hollow column 701 to prevent the molten metal from seeping into the demolding column 7 along the fitting gap; (During this process, those skilled in the art can also set the control cylinder 9 to perform telescopic movements according to process requirements. The telescopic movements of the cylinder 9 drive the base 501 and the vertical vibrators 5, demolding column 7 and vibration column 8 installed on it to rise synchronously, so that the vibration column 8 is further inserted into the molten metal in the cavity, so that the vibration column 8 vibrates at different positions) The second frequency can be set to 20kHz, the power to be 800W, and the amplitude to be 12μm. The 20kHz high-frequency vibration generates a strong transient cavitation effect in the molten aluminum alloy. The tiny bubbles dispersed in the molten metal rapidly collapse and coalesce into large bubbles under the action of high-frequency vibration. Under the action of buoyancy, they float to the top of the cavity and are discharged through the exhaust channel. The duration of the high-frequency vibration is 10 to 18 seconds.

[0036] S4, Pressure Holding and Solidification: After the high-frequency vibration pressure holding time is set, the control module controls the vertical vibrator 5 to stop vibrating and resets the vibrating column 8, allowing the molten metal to solidify naturally under pressure holding to form a complex thin-walled casting.

[0037] S5, Demolding Operation: After the metal has completely solidified, the data processing module determines that the demolding stage has begun and outputs an auxiliary demolding mode control command. The control module first drives the upper mold 1 to open, and then regulates all vertical vibrators 5 to start the auxiliary demolding mode. The vibrator 503 drives the vibrating column 8 to vibrate at the set third frequency. The vibration energy is transmitted to the formed casting, causing the casting to produce micro-vibrations, which break the vacuum adsorption effect and adhesion force between the casting and the cavity sidewall. Then, the cylinder 9 continues to extend, lifting the casting upward through the base 501 and the demolding column 7, and ejecting the casting from the lower mold core 201 to complete the demolding. After the casting is removed, the cylinder 9 drives all components to reset, waiting for the next casting operation. The third frequency can be set to 20Hz, the amplitude is 0.5mm, and the vibration lasts for about 2 to 3 seconds.

[0038] This solution uses an auxiliary vibration control system in conjunction with multiple vertical vibrators 5 to achieve multi-process, multi-mode vibration control. It can match the vibration action of corresponding frequencies for three different process stages: slow injection filling, filling completion, and demolding. Compared with traditional casting equipment with single-parameter vibration, it has stronger process adaptability and higher vibration utilization. In the slow injection filling stage, the low-frequency vibration is transmitted to the guide column 4 through the vertical vibrator 5 under the vibration table 6 via the vibration column 61, thereby transferring vibration energy to the molten metal injected into the cavity. This can effectively improve the fluidity of the molten metal filling and solve the problems of cold shut and under-casting defects that are easy to occur when producing complex thin-walled castings in the existing technology. After the filling is completed, this solution can drive the vertical vibrator 5 through the cylinder 9 to drive the vibrating column 8 to rise and insert into the molten metal inside the mold cavity. The high-frequency vibration directly transfers energy to the molten metal, which can promote the breaking and floating of bubbles in the molten metal, improve the density of the casting, refine the solidified grain structure of the casting, and improve the overall mechanical properties of the casting. This solves the problems of long vibration transmission path, large energy attenuation, and poor degassing and refining effect in the existing technology. In this design, the demolding column 7 uses a sealing ring to achieve an interference seal between the vibrating column 8 and the hollow column 701, which effectively prevents molten metal from seeping into the demolding column 7 along the fitting gap during the filling process, thus improving the stability and service life of the equipment. During the demolding stage, this design uses the vertical vibrator 5 to drive the vibrating column 8 to output vibration, which breaks the vacuum adsorption effect and adhesion force between the casting and the side wall of the cavity in advance. Combined with the lifting of the demolding column 7, the demolding is completed, which effectively reduces the demolding difficulty, avoids deformation and damage of thin-walled castings during the ejection process, and greatly improves the finished product qualification rate.

[0039] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A vibration-assisted precision casting device for complex thin-walled castings, comprising an upper mold (1) and a lower mold (2) that cooperate with each other, wherein a molten metal injection head (3) is installed on the upper mold (1), an upper mold core (101) is installed inside the upper mold (1), and a lower mold core (201) is provided inside the lower mold (2), wherein the upper mold core (101) and the lower mold core (201) form a cavity, characterized in that: The upper mold (1) is equipped with a guide post (4) that matches the flushing head (3), and the guide post (4) has a liquid injection channel. The cavity is connected to the flushing head (3) through the liquid injection channel. The lower mold (2) is equipped with multiple vertical vibrators (5) and a cylinder (9) for driving the vertical vibrators (5) to move in the vertical direction. The lower mold (2) is equipped with a vibration table (6) and multiple demolding columns (7). The vibration table (6) and demolding columns (7) are each connected to a vertical vibrator (5). The guide post (4) has a docking groove that matches the vibration table (6). When the upper mold (1) and the lower mold (2) are closed, the guide post (4) docks with the vibration table (6). The vibration table (6) has a slidable vibration column (61). The demolding column (7) is matched with the cavity position, and the demolding column (7) is slidably sealed with a vibrating column (8); the vertical vibrator (5) includes a base (501) connected to the telescopic end of the cylinder (9), an electromagnet (502) and a vibrating body (503), the electromagnet (502) is ring-shaped and sleeved around the vibrating body (503), and the vibrating body (503) is fixedly connected to the vibrating column (61) or the vibrating column (8).

2. The vibration-assisted precision casting equipment for complex thin-walled castings according to claim 1, characterized in that: The demolding column (7) includes a hollow column (701), and a docking seat (702) is connected to the lower end of the hollow column (701). The hollow column (701) has a sliding cavity that matches the vibrating column (8). A sealing ring is provided on the inner wall of the sliding cavity. The sealing ring is used to maintain the sealing fit between the two during the sliding process of the vibrating column (8) relative to the hollow column (701).

3. The vibration-assisted precision casting equipment for complex thin-walled castings according to claim 1, characterized in that: The vibration table (6) has a sliding hole in the middle that matches the vibrating body (503), and the vibration column (61) is slidably connected to the sliding hole. The vibration column (61) is engaged with the docking groove when the upper mold (1) and the lower mold (2) are closed.

4. A vibration-assisted precision casting device for complex thin-walled castings according to any one of claims 1-3, characterized in that: It also includes an auxiliary vibration control system, which includes a data acquisition module, a data processing module, and a control module; The data acquisition module is used to acquire the real-time vibration frequency parameters of multiple vertical vibrators (5), the filling progress signal of the molten metal inside the cavity, and the actual displacement stroke signal of the cylinder (9), and then convert the acquired analog signals into digital signals that can be transmitted and processed and send them to the data processing module. The data processing module receives the acquisition signals transmitted by the data acquisition module, compares and matches the real-time acquisition parameters with the preset parameter thresholds for the slow injection filling stage, filling completion stage, and demolding stage, determines the current casting process stage of the equipment, and generates control commands for the corresponding working mode to be output to the control module. The control module is used to receive control commands output by the data processing module and adjust each vertical vibrator (5) to switch to the corresponding working mode according to the commands.

5. The vibration-assisted precision casting equipment for complex thin-walled castings according to claim 4, characterized in that: The working modes of the vertical vibrator (5) include: low-frequency vibration mode, high-frequency vibration mode and assisted demolding mode.

6. The vibration-assisted precision casting equipment for complex thin-walled castings according to claim 5, characterized in that: When the low-frequency vibration mode is working, the vertical vibrator (5) is controlled to drive the guide column (4) to vibrate at a set first frequency. The vibration energy is transmitted to the molten metal filling the cavity through the guide column (4). The low-frequency vibration mode is used in the slow injection molding stage.

7. The vibration-assisted precision casting equipment for complex thin-walled castings according to claim 5, characterized in that: When the high-frequency vibration mode is working, the vertical vibrator (5) switches to the high-frequency vibration mode, so that the vibration column (8) vibrates at the set second frequency. The high-frequency micro-vibration of the vibration column (8) directly acts on the molten metal in the cavity to promote the breaking and discharge of bubbles in the molten metal. The high-frequency vibration mode is used when the molten metal filling is completed.

8. The vibration-assisted precision casting equipment for complex thin-walled castings according to claim 5, characterized in that: When the auxiliary demolding mode is working, the vibrating column (8) vibrates at the set third frequency to drive the molded casting to produce a slight displacement, thereby destroying the vacuum adsorption effect and adhesion force between the casting and the cavity sidewall. Then, in conjunction with the lifting action of the demolding column (7), the casting can be smoothly ejected and demolded. The auxiliary demolding mode is used in the demolding stage after molding.

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