Vacuum die casting equipment

Abstract

The invention relates to the technical field of die casting equipment, and provides vacuum die casting equipment which comprises a mold assembling module, an injection module and a pulse module. A movable mold in the mold closing module is connected with an external power mechanism and can be pressed towards the fixed mold to form a mold cavity; the injection module comprises a feeding cylinder, a sealing ball valve, an injection plunger rod and a corrugated sealing sleeve; the injection plunger rod is connected with an external injection mechanism and can reciprocate in the feeding cylinder; the sealing ball valve is arranged on the cylinder wall of the feeding cylinder; the periphery of the injection plunger rod is sleeved with the corrugated sealing sleeve, one end of the corrugated sealing sleeve is in sealed butt joint with the feeding cylinder, and the corrugated sealing sleeve can correspondingly generate wave-shaped elastic deformation stretching and retracting along with reciprocating motion of the injection plunger rod; the pulse module is arranged at the end, close to the feeding barrel, of the injection plunger rod and can generate high-frequency pulse vibration under the action of pulse current. The vacuum die-casting equipment can effectively weaken or eliminate the turbulent air entrapment effect generated when molten metal is injected, and air hole residues in a formed workpiece are reduced or eliminated.

Description

Technical Field

[0001] The present disclosure relates to the technical field of die-casting equipment, and in particular to vacuum die-casting equipment. Background Art

[0002] Die casting is a precision casting method that uses high pressure to force molten metal into a complex mold. Die castings offer excellent dimensional accuracy and smooth surfaces, reducing or eliminating secondary machining. They also offer high production speeds and are suitable for large-scale, industrialized casting of highly fluid metals.

[0003] However, the die-casting process also has inherent drawbacks. During the die-casting process, high-speed molten metal filling prevents the gas in the mold cavity from escaping quickly. This gas is drawn into the molten metal and forms bubbles. After the casting solidifies, these bubbles form dense pores with diameters ranging from 50μm to 200μm. This die-casting defect can lead to gas expansion during heat treatment, causing blistering or cracking. Unheat-treated as-cast die-castings, however, are limited in their application because their mechanical properties do not meet the requirements of specific working conditions.

[0004] Vacuum die-casting is a process that actively removes gases (primarily air and gases generated by the release agent) from the mold cavity during the die-casting process, allowing molten metal to fill the cavity at high speeds (>5 m / s) under negative pressure or near-vacuum conditions. However, in existing vacuum die-casting processes, the high-speed injection of molten metal can cause turbulent air entrainment, resulting in residual air pockets even with vacuum conditions.

[0005] In view of this, the market is in urgent need of a new type of vacuum die-casting equipment to solve the problem in the existing technology that high-speed injection of molten metal causes turbulent air entrainment and still leads to some residual pores in vacuum die-casting. Summary of the Invention

[0006] The embodiments of the present disclosure provide a vacuum die-casting device to solve the problem in the related art that high-speed injection of molten metal into turbulent air may still cause some air holes to remain.

[0007] The vacuum die-casting equipment provided by the embodiment of the present disclosure includes a mold closing module, an injection module and a pulse module;

[0008] The mold closing module includes a movable mold and a fixed mold, and the movable mold is connected to an external power mechanism and can be pressed toward the fixed mold to form a mold cavity;

[0009] The injection module includes a feed cylinder, a sealing ball valve, an injection plunger rod and a corrugated sealing sleeve;

[0010] One end of the feed cylinder is conductively connected to the mold cavity, and the other end is penetrated by the injection plunger rod;

[0011] The injection plunger rod is connected to the external injection mechanism and can reciprocate in the feed cylinder;

[0012] The sealing ball valve is arranged on the wall of the feed barrel through the valve seat, and is used for feeding the feed barrel;

[0013] The corrugated sealing sleeve is sleeved on the outer periphery of the injection plunger rod, and one end thereof is sealedly connected to the feed barrel, and the corrugated sealing sleeve can also generate waveform elastic deformation and expansion and contraction corresponding to the reciprocating movement of the injection plunger rod;

[0014] The pulse module is arranged at the end of the injection plunger rod close to the feeding cylinder, and can generate high-frequency pulse vibration under the action of pulse current.

[0015] In one embodiment, the pulse module includes:

[0016] a piezoelectric pulse element, a plurality of which are arranged in a ring array at the injection end portion of the injection plunger rod, and are used to generate high-frequency pulse vibration vertically toward the injection end face;

[0017] A cooling component is provided in the injection plunger rod and contacts the piezoelectric pulse component for cooling the piezoelectric pulse component.

[0018] In one possible implementation, the pulse module further includes a pulse coordination controller;

[0019] The vacuum die-casting equipment further comprises a vacuum aspirator;

[0020] The pulse cooperative controller is electrically connected to the piezoelectric pulse component and the vacuum aspirator respectively, and can increase the power of the vacuum aspirator correspondingly when the vibration wave peak of the piezoelectric pulse component is reached, and reduce the power of the vacuum aspirator correspondingly when the vibration wave peak of the piezoelectric pulse component is reached.

[0021] In one embodiment, the vacuum die-casting equipment further includes a protection module;

[0022] The protection module includes a drainage tube, a heat-insulating protection sleeve and a positioning seat;

[0023] One end of the drainage tube is connected to the sealing ball valve, and the other end is connected to the external feeding mechanism;

[0024] The heat-insulating protective sleeve is coaxially sleeved on the outer periphery of the drainage tube at intervals;

[0025] The positioning seat is correspondingly connected to the valve seat of the sealing ball valve, and a guide hole is opened at the bottom. The top is correspondingly installed and connected to the heat insulation protection sleeve through a positioning sleeve.

[0026] In one embodiment, the protection module further includes an electric heating coil;

[0027] The electric heating coil is arranged between the heat-insulating protective sleeve and the drainage tube, and is used to heat and increase the temperature of the drainage tube.

[0028] In one embodiment, the protection module further includes an electromagnet;

[0029] A plurality of electromagnets are provided at the bottom of the positioning seat around the guide hole, and are used to magnetically connect the positioning seat to the valve seat of the sealing ball valve.

[0030] In one embodiment, the mold closing module further includes an ejection mechanism fixedly disposed in a movable mold base plate of the movable mold;

[0031] The ejection mechanism is installed and connected to the movable mold, and is used to eject the die-cast workpiece in the mold cavity away from the movable mold.

[0032] In one embodiment, the ejection mechanism includes a housing, a ejector plate, and a hydraulic cylinder;

[0033] The housing is connected to the movable mold to form a sealed cavity;

[0034] The top plate is arranged in the sealed cavity and is connected to the movable mold through a plurality of ejector rods;

[0035] The hydraulic cylinder is arranged on a side of the top plate facing away from the top rod, and is used to drive the top plate and the top rod to perform ejection movement.

[0036] In one embodiment, the movable mold is further provided with a feeding riser, and a vacuum valve is provided in the feeding riser;

[0037] The vacuum valve is connected to an external vacuum pumping device.

[0038] In one embodiment, the injection plunger rod includes a rod body;

[0039] The two ends of the rod body are respectively provided with a plunger head and a limit plate, and the plunger head is slidingly plugged into the feed barrel, and the limit plate is connected to the external injection mechanism.

[0040] The technical solution provided by the embodiments of the present disclosure has the following advantages compared with related technologies:

[0041] The vacuum die-casting equipment provided by the embodiment of the present disclosure has a high degree of modularity and can effectively improve the work efficiency and quality of traditional die-casting operations. The feed barrel and the injection plunger rod are connected by a corrugated sealing sleeve, which realizes sealing in high-temperature, high-pressure and dynamic displacement environments, and also has flexible compensation for the movement process of the injection plunger rod. In addition, the pulse module can also cooperate with the corrugated sealing sleeve to superimpose on each other, so that the injection plunger rod can better generate periodic frequency micro-vibrations, so that the molten metal at the injection end of the injection plunger rod can better change from turbulent flow to laminar flow, thereby effectively weakening or eliminating the turbulent air entrainment effect generated by the molten metal when it is injected, and effectively reducing or eliminating the residual pores in the formed workpiece.

[0042] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings, in which several embodiments of the present disclosure are shown by way of example and not limitation, wherein:

[0044] In the drawings, the same or corresponding reference numerals denote the same or corresponding parts.

[0045] Figure 1 A schematic structural diagram of a vacuum die-casting device provided in an embodiment of the present disclosure is shown;

[0046] Figure 2 A partial assembly diagram of the vacuum die-casting equipment provided by an embodiment of the present disclosure is shown.

[0047] Explanation of the reference numerals in the figure: 1, closing module; 11, movable mold; 111, movable mold base plate; 12, ejector mechanism; 121, housing; 122, ejector plate; 123, ejector pin; 124, hydraulic cylinder; 13, fixed mold; 14, feeding riser; 141, vacuum valve;

[0048] 2. Injection module; 21. Feed barrel; 22. Sealing ball valve; 23. Injection plunger rod; 231. Plunger head; 232. Limiting plate; 24. Bellows sealing sleeve;

[0049] 3. Protection module; 31. Thermal insulation protection sleeve; 32. Drainage tube; 33. Positioning seat; 331. Guide hole; 332. Positioning sleeve; 34. Electric heating coil; 35. Electromagnet;

[0050] 4. Pulse module; 41. Piezoelectric pulse component; 42. Cooling component. DETAILED DESCRIPTION

[0051] To make the purposes, features, and advantages of the present disclosure more apparent and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without creative work shall fall within the scope of protection of the present disclosure.

[0052] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0053] Combine Figure 1 As shown, the embodiment of the present disclosure provides a vacuum die-casting device, which includes a mold closing module 1, an injection module 2 and a pulse module 4; the mold closing module 1 includes a movable mold 11 and a fixed mold 13, and the movable mold 11 is connected to an external power mechanism and can be pressed toward the fixed mold 13 to form a mold cavity; the injection module 2 includes a feed barrel 21, a sealing ball valve 22, an injection plunger rod 23 and a corrugated sealing sleeve 24; one end of the feed barrel 21 is conductively connected to the mold cavity, and the other end is interspersed with an injection plunger rod 23; the injection plunger rod 23 is connected to the external injection mechanism and can reciprocate in the feed barrel 21; the sealing ball valve 22 is set on the barrel wall of the feed barrel 21 through the valve seat, and is used to supply material to the feed barrel 21;

[0054] The corrugated sealing sleeve 24 is sleeved on the outer periphery of the injection plunger rod 23, and one end is sealed and docked with the feed barrel 21. The corrugated sealing sleeve 24 can also generate waveform elastic deformation and expansion and contraction corresponding to the reciprocating movement of the injection plunger rod 23; the pulse module 4 is arranged at the end of the injection plunger rod 23 close to the feed barrel 21, and can generate high-frequency pulse vibration under the action of pulse current.

[0055] When the vacuum die-casting equipment provided by the embodiment of the present disclosure is used for die-casting manufacturing, the mold module 1, the injection module 2 and the pulse module 4 are first assembled accordingly; the movable mold 11 and the fixed mold 13 are installed and positioned; the feed barrel 21, the injection plunger rod 23 and the corrugated sealing sleeve 24 are fitted and installed; finally, the sealing ball valve 22 is installed and the coordinated operation of each module is debugged.

[0056] After the above installation and debugging steps are completed, confirm that the movable mold 11 and the fixed mold 13 are matched, the feed barrel 21 is in a sealed state, and the mold cavity and the feed barrel 21 are connected at this time, and then the aluminum alloy melt at 650°C to 720°C can be added to the feed barrel 21; then start the servo motor of the sealing ball valve 22 to drive the sealing ball valve 22 to close, and a metal hard seal can be used to isolate the feed barrel 21 from the sealing ball valve 22.

[0057] The mold cavity is then evacuated using an external vacuum pump, achieving vacuum equilibrium between the mold cavity and the feed barrel 21. The vacuum level in the mold cavity can be precisely maintained at -0.05 MPa to -0.09 MPa, depending on the actual size of the die-cast part. Once the vacuum level reaches the preset value, the vacuum pump is turned off. The injection plunger 23 is then activated for high-speed injection. The instantaneous speed of the injection plunger 23 can be set to 5 m / s to 10 m / s, and the injection pressure can be instantly increased to 100 MPa to 200 MPa.

[0058] The bellows sealing sleeve 24 can be made of nickel-chromium-molybdenum alloy. The two ends of the bellows sealing sleeve 24 can be sealed and connected to the feed barrel 21 and the injection plunger rod 23 through clamps. The corrugations of the bellows sealing sleeve 24 can be set to Ω-shaped waves, and multiple waves can be connected in series (20 to 60 waves) to better provide axial displacement compensation capabilities.

[0059] Since the bellows sealing sleeve 24 can be compressed synchronously with the movement of the injection plunger rod 23, and the wave unit in the bellows sealing sleeve 24 can elastically deform to produce an axial displacement of ±5mm, it can absorb the mechanical vibration generated by the high-speed movement of the injection plunger rod 23 to a certain extent.

[0060] In addition, the compression process of the corrugated sealing sleeve 24 can also cause periodic frequency micro-vibrations to be generated synchronously in the injection motion stroke of the injection plunger rod 23, and the pulse module 4 is also correspondingly arranged at the end of the injection plunger rod 23 close to the feed barrel 21, and can generate high-frequency pulse vibrations under the action of the pulse current. The high-frequency pulse vibration of the pulse module 4 can be set to be synchronized with the frequency micro-vibration generated by the compression of the corrugated sealing sleeve 24. In this way, the pulse module 4 and the corrugated sealing sleeve 24 can be superimposed and synergistically acted on each other, so that the molten metal at the injection end of the injection plunger rod 23 can be better transformed from turbulent flow to laminar flow, and the "turbulent air entrainment" effect generated when the molten metal is injected under pressure can be more fully weakened and eliminated, thereby minimizing the residual pores in the formed workpiece.

[0061] In summary, the vacuum die-casting equipment provided by the embodiment of the present disclosure has a high degree of modularity, which can effectively improve the work efficiency and quality of traditional die-casting operations; and the feed barrel 21 and the injection plunger rod 23 are connected through the corrugated sealing sleeve 24, thereby realizing sealing in high temperature, high pressure and dynamic displacement environments, and also having flexible compensation for the movement process of the injection plunger rod 23, and can also cooperate with the pulse module 4 to superimpose on each other to make the injection plunger rod 23 synchronously generate periodic frequency micro-vibrations, so that the metal liquid at the injection end of the injection plunger rod 23 is better transformed from turbulent flow to laminar flow, and better weaken or eliminate the "turbulent air entrainment" effect generated when the metal liquid is injected, which has the beneficial effect of reducing or eliminating residual pores in the formed workpiece.

[0062] In one embodiment, the pulse module 4 includes a piezoelectric pulse component 41 and a cooling component 42; a plurality of piezoelectric pulse components 41 are arranged in a ring array in the injection end of the injection plunger rod 23, and are used to generate high-frequency pulse vibrations vertically toward the injection end face; the cooling component 42 is arranged in the injection plunger rod 23 and contacts with the piezoelectric pulse component 41, and is used to cool the piezoelectric pulse component 41.

[0063] Specific, combined Figure 1 To further explain in detail, the pulse module 4 is specifically configured to include a piezoelectric pulse component 41 and a cooling component 42, and the piezoelectric pulse component 41 can be a piezoelectric ceramic, such as a high-temperature resistant PZT-8 piezoelectric ceramic, and eight are provided which are sealed and embedded in the injection end of the injection plunger rod 23 in a ring array. In this way, the piezoelectric pulse component 41 can generate high-frequency pulse vibration vertically toward the injection end face, so that the metal liquid at the front end of the injection end face can absorb the high-frequency pulse vibration accordingly, destroy the "turbulent air entrainment" effect generated when it is injected, and refine the flow unit to make it laminar, thereby reducing or eliminating the residual pores in the formed workpiece.

[0064] Moreover, the cooling element 42 can cool the piezoelectric pulse element 41 by heat exchange to increase the service life of the piezoelectric pulse element 41 and avoid the problem of high-temperature damage or high-temperature failure of the piezoelectric pulse element 41 after long-term use.

[0065] It is also worth mentioning that in order to enhance the pulse vibration effect of the piezoelectric pulse component 41, a hydraulic amplification mechanism may be added to the injection plunger rod 23 to amplify the amplitude of the piezoelectric pulse component 41 through the principle of lever amplification.

[0066] In one embodiment, the pulse module 4 also includes a pulse cooperative controller; the vacuum die-casting equipment also includes a vacuum aspirator; the pulse cooperative controller is electrically connected to the piezoelectric pulse component 41 and the vacuum aspirator respectively, and can increase the power of the vacuum aspirator correspondingly when the vibration peak of the piezoelectric pulse component 41 is reached, and reduce the power of the vacuum aspirator correspondingly when the vibration peak of the piezoelectric pulse component 41 is reached.

[0067] Specifically, a pulse cooperative controller is also provided in the pulse module 4, and the pulse cooperative controller is electrically connected to the piezoelectric pulse component 41 and the vacuum aspirator respectively, so as to increase the power of the vacuum aspirator correspondingly when the piezoelectric pulse component 41 reaches the vibration peak, and reduce the power of the vacuum aspirator correspondingly when the piezoelectric pulse component 41 reaches the vibration trough. In this way, the vacuum exhaust can be enhanced when the piezoelectric pulse component 41 reaches the vibration peak, and low pressure can be maintained to prevent splashing when the vibration trough is reached.

[0068] The pulse cooperative controller mentioned above is set up to match the amplitude of the injection plunger rod 23 with the vacuum pumping power of the vacuum aspirator in real time, so as to better suppress the "turbulent air entrainment" effect of the metal liquid at the injection end of the injection plunger rod 23.

[0069] In one embodiment, the vacuum die-casting equipment also includes a protection module 3; the protection module 3 includes a drainage tube 32, a thermal insulation protection sleeve 31 and a positioning seat 33; one end of the drainage tube 32 is correspondingly connected to the sealing ball valve 22, and the other end is connected to the external feeding mechanism; the thermal insulation protection sleeve 31 is coaxially spaced and sleeved on the outer periphery of the drainage tube 32; the positioning seat 33 is correspondingly connected to the valve seat of the sealing ball valve 22, and a guide hole 331 is opened at the bottom, and the top is correspondingly installed and connected to the thermal insulation protection sleeve 31 through a positioning sleeve 332.

[0070] Specific, combined Figure 2 To further explain in detail, a protection module 3 is additionally provided at the sealing ball valve 22, and one end of the drainage tube 32 in the protection module 3 is correspondingly connected to the sealing ball valve 22, and the other end is connected to the external feeding mechanism, so that the metal solution can be added to the feeding barrel 21 through the drainage tube 32 when the sealing ball valve 22 is opened; and the heat-insulating protection sleeve 31 is coaxially spaced on the outer periphery of the drainage tube 32, which can reduce the heat loss of the drainage tube 32 on the one hand, and avoid accidental burns caused by direct exposure of the drainage tube 32 on the other hand; and the positioning seat 33 is correspondingly connected to the valve seat of the sealing ball valve 22, and the bottom end of the drainage tube 32 is correspondingly installed and set through the guide hole 331, and the top end of the heat-insulating protection sleeve 31 is correspondingly installed and set through the positioning sleeve 332, so that the protection module 3 can be stably and reliably installed.

[0071] In one embodiment, the protection module 3 further includes an electric heating coil 34 ; the electric heating coil 34 is disposed between the heat-insulating protection sleeve 31 and the drainage tube 32 , and is used to heat the drainage tube 32 .

[0072] Specific, combined Figure 2 To further explain in detail, an electric heating coil 34 is also provided in the protection module 3, and the electric heating coil 34 can be provided between the heat-insulating protection sleeve 31 and the drainage tube 32, for heating and heating the drainage tube 32. This can fully ensure the temperature stability of the molten metal in the drainage tube 32, thereby effectively preventing the molten metal from solidifying at low temperature and causing failure of the sealing ball valve 22, or causing the sealing structure of the sealing ball valve 22 to be damaged due to thermal expansion and contraction due to rapid changes in the temperature of the molten metal, thereby indirectly improving the stability of the operation of the sealing ball valve 22.

[0073] In one embodiment, the protection module 3 further includes an electromagnet 35 ; a plurality of electromagnets 35 are provided at the bottom of the positioning seat 33 around the guide hole 331 , for magnetically connecting the positioning seat 33 to the valve seat of the sealing ball valve 22 .

[0074] Specific, combined Figure 2 To further explain in detail, an electromagnet 35 is also provided in the protection module 3, and a plurality of electromagnets 35 are provided around the guide hole 331 at the bottom of the positioning seat 33, so that the electromagnet 35 can generate a magnetic force when powered on, so that the positioning seat 33 can be further connected and fixed to the valve seat of the sealing ball valve 22 through the magnetic force, thereby further improving the installation reliability and use safety of the protection module 3.

[0075] In one embodiment, the closing module 1 further includes an ejection mechanism 12 fixedly disposed in the movable mold base plate 111 of the movable mold 11 ; the ejection mechanism 12 is installed and connected to the movable mold 11 and is used to eject the die-cast workpiece in the mold cavity away from the movable mold 11 .

[0076] Specific, combined Figure 1 To further explain in detail, an ejection mechanism 12 is also installed in the movable mold base plate 111 of the movable mold 11, and the ejection mechanism 12 can eject the die-cast workpiece in the mold cavity away from the movable mold 11. In this way, when the vacuum die-casting equipment completes the die-casting of a workpiece and opens the mold, the ejection mechanism 12 can automatically eject the workpiece from the mold to facilitate continuous die-casting of subsequent workpieces.

[0077] In one embodiment, the ejection mechanism 12 includes a shell 121, a top plate 122 and a hydraulic cylinder 124; the shell 121 is installed and connected to the movable mold 11 to form a sealed cavity; the top plate 122 is arranged in the sealed cavity and is connected to the movable mold 11 through a plurality of ejector rods 123; the hydraulic cylinder 124 is arranged on the side of the top plate 122 facing away from the ejector rods 123, and is used to drive the top plate 122 and the ejector rods 123 to perform ejection movement.

[0078] Specific, combined Figure 1 To further explain in detail, the ejection mechanism 12 is specifically configured to include a shell 121, a top plate 122 and a hydraulic cylinder 124, and the shell 121 is installed and connected to the movable mold 11 to form a sealed cavity, the top plate 122 is arranged in the sealed cavity and is connected to the movable mold 11 through the ejector rod 123. In this way, when the hydraulic cylinder 124 is working, it can correspondingly drive the top plate 122 to move toward the movable mold 11, and make multiple ejector rods 123 pass through the movable mold 11 to demold and eject the workpiece from the movable mold 11.

[0079] In one embodiment, a feeding riser 14 is further provided in the movable mold 11 , and a vacuum valve 141 is provided in the feeding riser 14 ; the vacuum valve 141 is connected to an external vacuum pumping device.

[0080] Specific, combined Figure 1 To further explain in detail, when the movable mold 11 and the fixed mold 13 cooperate with each other to form the mold cavity, the feeding riser 14 can be connected to the mold cavity, and the vacuum valve 141 provided in the feeding riser 14 can be connected to an external vacuum pumping device, and under the suction action of the external vacuum pumping device, the gas in the mold cavity is gradually extracted to form a vacuum negative pressure environment of -0.05MPa to -0.09Mpa.

[0081] In one embodiment, the injection plunger rod 23 includes a rod body; a plunger head 231 and a limit plate 232 are respectively provided at both ends of the rod body, and the plunger head 231 is slidably plugged into the feed barrel 21, and the limit plate 232 is connected to the external injection mechanism.

[0082] Specific, combined Figure 1 To further explain in detail, a plunger head 231 and a limit plate 232 are respectively provided at both ends of the rod body of the injection plunger rod 23, and the plunger head 231 is slidably installed on the feed barrel 21, and the limit plate 232 is connected to the external injection mechanism, so that the injection plunger rod 23 as a whole can be in a "dumbbell-shaped" structure, and the injection function of the feed barrel 21 is realized by the plunger head 231, and the injection stroke of the injection plunger rod 23 can be blocked and limited by the limit plate 232.

[0083] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means two or more, unless otherwise specifically defined.

[0084] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A vacuum die-casting device, characterized in that: It comprises a mold closing module (1), an injection module (2) and a pulse module (4); The mold closing module (1) comprises a movable mold (11) and a fixed mold (13), and the movable mold (11) is connected to an external power mechanism and can be pressed toward the fixed mold (13) to form a mold cavity; The injection module (2) comprises a feed cylinder (21), a sealing ball valve (22), an injection plunger rod (23) and a corrugated sealing sleeve (24); One end of the feed cylinder (21) is conductively connected to the mold cavity, and the other end is penetrated by the injection plunger rod (23); The injection plunger rod (23) is connected to an external injection mechanism and is capable of reciprocating in the feed cylinder (21); The sealing ball valve (22) is arranged on the wall of the feed barrel (21) through a valve seat and is used for feeding materials into the feed barrel (21); The corrugated sealing sleeve (24) is sleeved on the outer periphery of the injection plunger rod (23), and one end thereof is sealedly connected to the feed cylinder (21). The corrugated sealing sleeve (24) can also generate waveform elastic deformation and expansion and contraction corresponding to the reciprocating movement of the injection plunger rod (23); The pulse module (4) is arranged at the end of the injection plunger rod (23) close to the feed cylinder (21), and is capable of generating high-frequency pulse vibration under the action of a pulse current.

2. The vacuum die-casting equipment according to claim 1, characterized in that: The pulse module (4) comprises: A plurality of piezoelectric pulse components (41) are provided in a ring array at the injection end portion of the injection plunger rod (23) and are used to generate high-frequency pulse vibration vertically toward the injection end surface; A cooling and temperature reduction component (42) is arranged in the injection plunger rod (23) and contacts the piezoelectric pulse component (41) for cooling the piezoelectric pulse component (41).

3. The vacuum die-casting equipment according to claim 2, characterized in that: The pulse module (4) also includes a pulse coordination controller; The vacuum die-casting equipment further comprises a vacuum aspirator; The pulse cooperative controller is electrically connected to the piezoelectric pulse component (41) and the vacuum aspirator respectively, and can increase the power of the vacuum aspirator correspondingly when the vibration wave peak of the piezoelectric pulse component (41) is reached, and can reduce the power of the vacuum aspirator correspondingly when the vibration wave peak of the piezoelectric pulse component (41) is reached.

4. The vacuum die-casting equipment according to any one of claims 1 to 3, characterized in that: The vacuum die-casting equipment further comprises a protection module (3); The protection module (3) comprises: A drainage tube (32), one end of which is connected to the sealing ball valve (22) and the other end of which is connected to an external feeding mechanism; a heat-insulating protective sleeve (31) coaxially sleeved on the outer periphery of the drainage tube (32) at intervals; The positioning seat (33) is correspondingly connected to the valve seat of the sealing ball valve (22), and a guide hole (331) is opened at the bottom. The top is correspondingly installed and connected to the heat insulation protection sleeve (31) through a positioning sleeve (332).

5. The vacuum die-casting equipment according to claim 4, characterized in that: The protection module (3) further includes an electric heating coil (34); The electric heating coil (34) is arranged between the heat-insulating protective sleeve (31) and the drainage tube (32) and is used to heat and increase the temperature of the drainage tube (32).

6. The vacuum die-casting equipment according to claim 4, characterized in that: The protection module (3) further includes an electromagnet (35); A plurality of electromagnets (35) are provided at the bottom of the positioning seat (33) around the guide hole (331) for magnetically connecting the positioning seat (33) with the valve seat of the sealing ball valve (22).

7. The vacuum die-casting equipment according to claim 1, characterized in that: The closing module (1) further includes an ejection mechanism (12) fixedly arranged in a movable mold base plate (111) of the movable mold (11); The ejection mechanism (12) is installed and connected to the movable mold (11) and is used to eject the die-cast workpiece in the mold cavity away from the movable mold (11).

8. The vacuum die-casting equipment according to claim 7, characterized in that: The ejection mechanism (12) comprises: A housing (121) is installed and connected to the movable mold (11) to form a sealed cavity; A top plate (122) is disposed in the sealed cavity and connected to the movable mold (11) via a plurality of top rods (123); A hydraulic cylinder (124) is provided on a side of the top plate (122) facing away from the top rod (123) and is used to drive the top plate (122) and the top rod (123) to perform ejection movement.

9. The vacuum die-casting equipment according to claim 1, characterized in that: The movable mold (11) is further provided with a feeding riser (14), and a vacuum valve (141) is provided in the feeding riser (14); The vacuum valve (141) is connected to an external vacuum pumping device.

10. The vacuum die-casting equipment according to claim 1, characterized in that: The injection plunger rod (23) comprises a rod body; A plunger head (231) and a limiting disk (232) are respectively provided at both ends of the rod body, and the plunger head (231) is slidably plugged into the feed barrel (21), and the limiting disk (232) is connected to an external injection mechanism.

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